TODO update + internals: changed order or ImGuiLayoutType enums to allow using them for indexing.

- Fixed abnormally high atlas height. (#618)
- Fixed support for any values of TexGlyphPadding (not just only 1). (#618)
- Atlas width is now properly based on total surface rather than glyph count (unless overridden with TexDesiredWidth). (#618)
- Fixed atlas builder so missing glyphs won't influence the atlas texture width. (#2233, #618)
- Fixed atlas builder so duplicate glyphs (when merging fonts) won't be included in the rasterized atlas. (#618)

.github/CONTRIBUTING.md

@@ -1,42 +0,0 @@
-## How to create an Issue
-
-Hello! 
-
-You may use the Issue Tracker to submit bug reports, feature requests or suggestions. You may ask for help or advice as well. However please read this wall of text before doing so. The amount of incomplete or ambiguous requests due to people not following those guidelines is often overwhelming. Please do your best to clarify your request. Thank you!
-
-**IF YOU ARE HAVING AN ISSUE COMPILING/LINKING/RUNNING/DISPLAYING/ADDING FONTS/WIRING INPUTS**
-- Please post on the "Getting Started" Discourse forum: https://discourse.dearimgui.org/c/getting-started
-
-**Prerequisites for new users of dear imgui:**
-- Please read the FAQ in imgui.cpp.
-- Please read misc/fonts/README.txt if your question relates to fonts or text.
-- Please run ImGui::ShowDemoWindow() to explore the demo and its sources.
-- Please use the Search function of GitHub to look for similar issues. You may also browse issues by tags.
-- Please use the Search function of your IDE to search in the code for comments related to your situation.
-- If you get a assert, use a debugger to locate the line triggering it and read the comments around the assert.
-
-**Guidelines to report an issue or ask a question:**
-- Please provide your imgui version number.
-- Please state if you have made substantial modifications to your copy of imgui. 
-- Try to be explicit with your Goals, your Expectations and what you have Tried. What you have in mind or in your code is not obvious to other people. People frequently discuss problems without first mentioning their goal.
-- If you are discussing an assert or a crash, please provide a debugger callstack. Never state "it crashes" without additional information. If you don't know how to use a debugger and retrieve a callstack, learning about it will be useful.
-- Please make sure that your compilation settings have asserts enabled. Calls to IM_ASSERT() are scattered in the code to help catch common issues. By default IM_ASSERT() calls the standard assert() function. To verify that your asserts are enabled, add the line `IM_ASSERT(false);` in your main() function. Your application should display an error message and abort. If your application report an error, it means that your asserts are disabled. Please make sure they are enabled.
-- When discussing issues related to rendering or inputs, please state the OS/back-end/renderer you are using. Please state if you are using a vanilla copy of the example back-ends (imgui_impl_XXX files), or a modified one, or if you built your own.
-- Please provide a Minimal, Complete and Verifiable Example ([MCVE](https://stackoverflow.com/help/mcve)) to demonstrate your problem. An ideal submission includes a small piece of code that anyone can paste in one of the examples/ application (e.g. in main.cpp or imgui_demo.cpp) to understand and reproduce it. Narrowing your problem to its shortest and purest form is the easiest way to understand it. Please test your shortened code to ensure it actually exhibit the problem. Often while creating the MCVE you will end up solving the problem! Many questions that are missing a standalone verifiable example are missing the actual cause of their issue in the description, which ends up wasting everyone's time.
-- Try to attach screenshots to clarify the context. They often convey useful information that are omitted by the description. You can drag pictures/files here (prefer github attachments over 3rd party hosting).
-- When requesting a new feature, please describe the usage context (how you intend to use it, why you need it, etc.).
-
-**Some unfortunate words of warning**
-- If you are or were involved in cheating schemes (e.g. DLL injection) for competitive online multi-player games, please don't post here. We won't answer and you will be blocked. We've had too many of you.
-- Due to frequent abuse of this service from aforementioned users, if your GitHub account is anonymous and was created five minutes ago please understand that your post will receive more scrutiny and incomplete questions may be dismissed.
-
-If you have been using dear imgui for a while or have been using C/C++ for several years or have demonstrated good behavior here, it is ok to not fullfill every item to the letter. Those are guidelines and experienced users or members of the community will know which information are useful in a given context.
-
-## How to create an Pull Request
-- When adding a feature, please describe the usage context (how you intend to use it, why you need it, etc.).
-- When fixing a warning or compilation problem, please post the compiler log and specify the version and OS you are using.
-- Try to attach screenshots to clarify the context and demonstrate the feature at a glance. You can drag pictures/files here (prefer github attachments over 3rd party hosting).
-- Make sure your code follows the coding style already used in imgui (spaces instead of tabs, "local_variable", "FunctionName", "MemberName", etc.). We don't use modern C++ idioms and can compile without C++11.
-- Make sure you create a branch for the pull request. In Git, 1 PR is associated to 1 branch. If you keep pushing to the same branch after you submitted the PR, your new commits will appear in the PR (we can still cherry-pick individual commits).
-
-Thank you for reading!

.github/pull_request_template.md

@@ -1,8 +0,0 @@
-- Please read https://github.com/ocornut/imgui/blob/master/.github/CONTRIBUTING.md
-- When adding a feature, please describe the usage context (how you intend to use it, why you need it, etc.).
-- When adding a feature, try to attach screenshots/gifs to clarify the context and demonstrate the feature at a glance.
-- When fixing a warning or compilation problem, post the compiler log and specify the version and OS you are using.
-- Make sure your code follows the coding style already used in the codebase (4 spaces identation, no tabs, `type* name`, `local_variable`, `FunctionName()`, `MemberName`, `// Text Comment`, `//CodeComment()`, etc.). We don't use modern C++ idioms, we don't use C++ style cast, we don't use C++ headers, and we can compile without a C++11 compatible compiler.
-- Make sure you create a branch for the pull request. In Git, 1 PR is associated to 1 branch. If you keep pushing to the same branch after you submitted the PR, your new commits will appear in the PR.
-
-(Clear this form before submitting your PR)

LICENSE.txt

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2014-2018 Omar Cornut
+Copyright (c) 2014-2019 Omar Cornut
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

docs/CHANGELOG.txt

@@ -29,6 +29,69 @@ HOW TO UPDATE?
 - Please report any issue!
 
 
+-----------------------------------------------------------------------
+ VERSION 1.67 (In Progress)
+-----------------------------------------------------------------------
+
+Breaking Changes:
+
+- Made it illegal to call Begin("") with an empty string. This somehow half-worked before but had various undesirable
+  side-effect because the window would have ID zero. In particular it is causing problems in viewport/docking branches.
+- Renamed io.ConfigResizeWindowsFromEdges to io.ConfigWindowsResizeFromEdges and removed its [Beta] mark.
+  The addition of new configuration options in the Docking branch is pushing for a little reorganization of those names.
+- Renamed ImFontAtlas::GlyphRangesBuilder to ImFontGlyphRangesBuilder. Keep redirection typedef (will obsolete).
+
+Other Changes:
+- Added BETA api for Tab Bar/Tabs widgets: (#261, #351)
+  - Added BeginTabBar(), EndTabBar(), BeginTabItem(), EndTabItem(), SetTabItemClosed() API.
+  - Added ImGuiTabBarFlags flags for BeginTabBar().
+  - Added ImGuiTabItemFlags flags for BeginTabItem().
+  - Style: Added ImGuiCol_Tab, ImGuiCol_TabHovered, ImGuiCol_TabActive, ImGuiCol_TabUnfocused, ImGuiCol_TabUnfocusedActive colors.
+  - Demo: Added Layout->Tabs demo code.
+  - Demo: Added "Documents" example app showcasing possible use for tabs.
+  This feature was merged from the Docking branch in order to allow the use of regular tabs in your code.
+  (It does not provide the docking/splitting/merging of windows available in the Docking branch)
+- Added ImGuiWindowFlags_UnsavedDocument window flag to append '*' to title without altering the ID, as a convenience
+  to avoid using the ### operator. In the Docking branch this also has an effect on tab closing behavior.
+- Window, Focus, Popup: Fixed an issue where closing a popup by clicking another window with the _NoMove flag would refocus
+  the parent window of the popup instead of the newly clicked window.
+- Window: Contents size is preserved while a window collapsed. Fix auto-resizing window losing their size for one frame when uncollapsed.
+- Window: Contents size is preserved while a window contents is hidden (unless it is hidden for resizing purpose).
+- Window: Resizing windows from edge is now enabled by default (io.ConfigWindowsResizeFromEdges=true). Note that 
+  it only works _if_ the back-end sets ImGuiBackendFlags_HasMouseCursors, which the standard back-ends do.
+- Window: Added io.ConfigWindowsMoveFromTitleBarOnly option. This is ignored by window with no title bars (often popups).
+  This affects clamping window within the visible area: with this option enabled title bars need to be visible. (#899)
+- Window: Fixed using SetNextWindowPos() on a child window (which wasn't really documented) position the cursor as expected
+  in the parent window, so there is no mismatch between the layout in parent and the position of the child window. 
+- InputFloat: When using ImGuiInputTextFlags_ReadOnly the step buttons are disabled. (#2257)
+- DragFloat: Fixed broken mouse direction change with power!=1.0. (#2174, #2206) [@Joshhua5]
+- Nav: Fixed an keyboard issue where holding Activate/Space for longer than two frames on a button would unnecessary 
+  keep the focus on the parent window, which could steal it from newly appearing windows. (#787)
+- Nav: Fixed animated window titles from being updated when displayed in the CTRL+Tab list. (#787)
+- Error recovery: Extraneous/undesired calls to End() are now being caught by an assert in the End() function closer
+  to the user call site (instead of being reported in EndFrame). Past the assert, they don't lead to crashes any more. (#1651)
+  Missing calls to End(), past the assert, should not lead to crashes or to the fallback Debug window appearing on screen.
+  Those changes makes it easier to integrate dear imgui with a scripting language allowing, given asserts are redirected
+  into e.g. an error log and stopping the script execution.
+- ImFontAtlas: Stb and FreeType: Atlas width is now properly based on total surface rather than glyph count (unless overridden with TexDesiredWidth).
+- ImFontAtlas: Stb and FreeType: Fixed atlas builder so missing glyphs won't influence the atlas texture width. (#2233)
+- ImFontAtlas: Stb and FreeType: Fixed atlas builder so duplicate glyphs (when merging fonts) won't be included in the rasterized atlas.
+- ImFontAtlas: FreeType: Fixed abnormally high atlas height.
+- ImFontAtlas: FreeType: Fixed support for any values of TexGlyphPadding (not just only 1).
+- ImDrawList: Optimized some of the functions for performance of debug builds where non-inline function call cost are non-negligible.
+  (Our test UI scene on VS2015 Debug Win64 with /RTC1 went ~5.9 ms -> ~4.9 ms. In Release same scene stays at ~0.3 ms.)
+- IO: Added BackendPlatformUserData, BackendRendererUserData, BackendLanguageUserData void* for storage use by back-ends.
+- IO: Renamed InputCharacters[], marked internal as was always intended. Please don't access directly, and use AddInputCharacter() instead!
+- IO: AddInputCharacter() goes into a queue which can receive as many characters as needed during the frame. This is useful
+  for automation to not have an upper limit on typing speed. Will later transition key/mouse to use the event queue later.
+- Style: Tweaked default value of style.DisplayWindowPadding from (20,20) to (19,19) so the default style as a value
+  which is the same as the title bar height.
+- Demo: "Simple Layout" and "Style Editor" are now using tabs.
+- Demo: Added a few more things under "Child windows" (changing ImGuiCol_ChildBg, positioning child, using IsItemHovered after a child).
+- Examples: DirectX10/11/12: Made imgui_impl_dx10/dx11/dx12.cpp link d3dcompiler.lib from the .cpp file to ease integration.
+- Examples: Allegro 5: Properly destroy globals on shutdown to allow for restart. (#2262) [@DomRe]
+
+
 -----------------------------------------------------------------------
  VERSION 1.66b (Released 2018-12-01)
 -----------------------------------------------------------------------
@@ -681,6 +744,7 @@ Breaking Changes:
 - Removed `IsItemRectHovered()`, `IsWindowRectHovered()` recently introduced in 1.51 which were merely the more consistent/correct names for the above functions which are now obsolete anyway. (#1382)
 - Changed `IsWindowHovered()` default parameters behavior to return false if an item is active in another window (e.g. click-dragging item from another window to this window). You can use the newly introduced IsWindowHovered() flags to requests this specific behavior if you need it. (#1382)
 - Renamed imconfig.h's `IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCS`/`IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCS` to `IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCTIONS`/`IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCTIONS` for consistency.
+- Renamed ImFont::Glyph to ImFontGlyph. Keep redirection typedef (will obsolete).
 
 Other Changes:
 

docs/README.md

@@ -1,15 +1,18 @@
-dear imgui,
+dear imgui
 =====
 [![Build Status](https://travis-ci.org/ocornut/imgui.svg?branch=master)](https://travis-ci.org/ocornut/imgui)
 [![Coverity Status](https://scan.coverity.com/projects/4720/badge.svg)](https://scan.coverity.com/projects/4720)
 
-_(This library is free but needs your support to sustain its development. There are many desirable features and maintenance ahead. If you are an individual using dear imgui, please consider donating via Patreon or PayPal. If your company is using dear imgui, please consider financial support (e.g. sponsoring a few weeks/months of development). I can invoice for technical support, custom development etc. Email: omarcornut at gmail)._
+_(This library is free as in freedom, but needs your support to sustain its development. In addition to maintenance and stability there are many desirable features yet to be added. If your company is using dear imgui, please consider reaching out for invoiced financial support. If you are an individual using dear imgui, please consider donating via Patreon or PayPal.)_
 
-Monthly donations via Patreon:
-<br>[![Patreon](https://cloud.githubusercontent.com/assets/8225057/5990484/70413560-a9ab-11e4-8942-1a63607c0b00.png)](http://www.patreon.com/imgui)
+Individuals/hobbyists: support continued maintenance and development via the monthly Patreon:
+<br>&nbsp;&nbsp;[![Patreon](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/patreon_01.png)](http://www.patreon.com/imgui)
 
-One-off donations via PayPal:
-<br>[![PayPal](https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=5Q73FPZ9C526U)
+Individuals/hobbyists: support continued maintenance and development via PayPal:
+<br>&nbsp;&nbsp;[![PayPal](https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=5Q73FPZ9C526U)
+
+Businesses: support continued maintenance and development via support contracts or sponsoring:
+<br>&nbsp;&nbsp;_E-mail: omarcornut at gmail dot com_
 
 Dear ImGui is a bloat-free graphical user interface library for C++. It outputs optimized vertex buffers that you can render anytime in your 3D-pipeline enabled application. It is fast, portable, renderer agnostic and self-contained (no external dependencies).
 
@@ -17,7 +20,7 @@ Dear ImGui is designed to enable fast iterations and to empower programmers to c
 
 Dear ImGui is particularly suited to integration in games engine (for tooling), real-time 3D applications, fullscreen applications, embedded applications, or any applications on consoles platforms where operating system features are non-standard. 
 
-See [Software using dear imgui](https://github.com/ocornut/imgui/wiki/Software-using-dear-imgui), [Quotes](https://github.com/ocornut/imgui/wiki/Quotes) and [Gallery](https://github.com/ocornut/imgui/issues/1902) pages to get an idea of its use cases.
+See [Software using dear imgui](https://github.com/ocornut/imgui/wiki/Software-using-dear-imgui), [Quotes](https://github.com/ocornut/imgui/wiki/Quotes) and [Gallery](https://github.com/ocornut/imgui/issues/2265) pages to get an idea of its use cases.
 
 Dear ImGui is self-contained within a few files that you can easily copy and compile into your application/engine:
 - imgui.cpp
@@ -124,7 +127,8 @@ Languages: (third-party bindings)
 - Pascal: [imgui-pas](https://github.com/dpethes/imgui-pas)
 - PureBasic: [pb-cimgui](https://github.com/hippyau/pb-cimgui)
 - Python [CyImGui](https://github.com/chromy/cyimgui) or [pyimgui](https://github.com/swistakm/pyimgui)
-- Rust: [imgui-rs](https://github.com/Gekkio/imgui-rs)
+- Ruby: [ruby-imgui](https://github.com/vaiorabbit/ruby-imgui)
+- Rust: [imgui-rs](https://github.com/Gekkio/imgui-rs) or [imgui-rust](https://github.com/nsf/imgui-rust)
 - Swift [swift-imgui](https://github.com/mnmly/Swift-imgui)
 
 Frameworks:
@@ -143,7 +147,7 @@ Frameworks:
 - OpenSceneGraph/OSG: [gist](https://gist.github.com/fulezi/d2442ca7626bf270226014501357042c)
 - ORX: [pr #1843](https://github.com/ocornut/imgui/pull/1843)
 - LÖVE+Lua: [love-imgui](https://github.com/slages/love-imgui)
-- Magnum: [magnum-imgui](https://github.com/lecopivo/magnum-imgui), [MagnumImguiPort](https://github.com/lecopivo/MagnumImguiPort)
+- Magnum: [ImGuiIntegration](https://doc.magnum.graphics/magnum/namespaceMagnum_1_1ImGuiIntegration.html) ([example](https://doc.magnum.graphics/magnum/examples-imgui.html))
 - NanoRT: [syoyo/imgui](https://github.com/syoyo/imgui/tree/nanort)
 - Qt3d: [imgui-qt3d](https://github.com/alpqr/imgui-qt3d), QOpenGLWindow [qtimgui](https://github.com/ocornut/imgui/issues/1910)
 - SFML: [imgui-sfml](https://github.com/EliasD/imgui-sfml)
@@ -158,7 +162,7 @@ Some of the goals for 2019 are:
 - Finish work on docking, tabs. (see [#2109](https://github.com/ocornut/imgui/issues/2109), public branch looking for feedback)
 - Finish work on multiple viewports / multiple OS windows. (see [#1542](https://github.com/ocornut/imgui/issues/1542), public branch looking for feedback)
 - Finish work on gamepad/keyboard controls. (see [#787](https://github.com/ocornut/imgui/issues/787))
-- Add an automation and testing system, both to test the library and end-user apps.
+- Add an automation and testing system, both to test the library and end-user apps. (see [#435](https://github.com/ocornut/imgui/issues/435))
 - Make Columns better. (they are currently pretty terrible!)
 - Make the examples look better, improve styles, improve font support, make the examples hi-DPI aware.
 
@@ -171,36 +175,21 @@ User screenshots:
 <br>[Gallery Part 4](https://github.com/ocornut/imgui/issues/973) (Jan 2017 to Aug 2017)
 <br>[Gallery Part 5](https://github.com/ocornut/imgui/issues/1269) (Aug 2017 to Feb 2018)
 <br>[Gallery Part 6](https://github.com/ocornut/imgui/issues/1607) (Feb 2018 to June 2018)
-<br>[Gallery Part 7](https://github.com/ocornut/imgui/issues/1902) (June 2018 onward)
+<br>[Gallery Part 7](https://github.com/ocornut/imgui/issues/1902) (June 2018 to January 2018)
+<br>[Gallery Part 8](https://github.com/ocornut/imgui/issues/2265) (January 2018 onward)
 <br>Also see the [Mega screenshots](https://github.com/ocornut/imgui/issues/1273) for an idea of the available features.
 
-Various tools
+Custom engine
 [![screenshot game](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v149/gallery_TheDragonsTrap-01-thumb.jpg)](https://cloud.githubusercontent.com/assets/8225057/20628927/33e14cac-b329-11e6-80f6-9524e93b048a.png)
 
+Custom engine
 [![screenshot tool](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v160/editor_white_preview.jpg)](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v160/editor_white.png)
 
-![screenshot demo](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v160/v160-misc-classic.png)
+Demo window
+![screenshot demo](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v167/v167-misc.png)
 
-[![screenshot profiler](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v148/profiler-880.jpg)](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v148/profiler.png)
-
-Dear ImGui can load TTF/OTF fonts. UTF-8 is supported for text display and input. Here using Arial Unicode font to display Japanese. Initialize custom font with:
-Code:
-```cpp
-ImGuiIO& io = ImGui::GetIO();
-io.Fonts->AddFontFromFileTTF("NotoSansCJKjp-Medium.otf", 20.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
-```
-```cpp
-ImGui::Text(u8"こんにちは！テスト %d", 123);
-if (ImGui::Button(u8"ロード"))
-{
-    // do stuff
-}
-ImGui::InputText("string", buf, IM_ARRAYSIZE(buf));
-ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
-```
-Result:
-<br>![sample code output](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v160/code_sample_02_jp.png)
-<br>_(settings: Dark style (left), Light style (right) / Font: NotoSansCJKjp-Medium, 20px / Rounding: 5)_
+[Tracy Profiler](https://bitbucket.org/wolfpld/tracy)
+![tracy profiler](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v167/tracy_profiler.png)
 
 References
 ----------
@@ -218,7 +207,7 @@ See the [Wiki](https://github.com/ocornut/imgui/wiki) for more references and [B
 Support Forums
 --------------
 
-If you have issues with: compiling, linking, adding fonts, running or displaying Dear ImGui, or wiring inputs: please post on the Discourse forum: https://discourse.dearimgui.org.
+If you have issues with: compiling, linking, adding fonts, running or displaying Dear ImGui, or wiring inputs: please post on the Discourse forums: https://discourse.dearimgui.org.
 
 For any other questions, bug reports, requests, feedback, you may post on https://github.com/ocornut/imgui/issues. Please read and fill the New Issue template carefully.
 
@@ -243,33 +232,27 @@ You may also peak at the [Multi-Viewport](https://github.com/ocornut/imgui/issue
 
 See the [Quotes](https://github.com/ocornut/imgui/wiki/Quotes) and [Software using dear imgui](https://github.com/ocornut/imgui/wiki/Software-using-dear-imgui) pages for an (incomplete) list of games/software which are publicly known to use dear imgui. Please add yours if you can!
 
-**Why the odd dual naming, "dear imgui" vs "ImGui"?**
+**Why the odd dual naming, "Dear ImGui" vs "ImGui"?**
 
 The library started its life and is best known as "ImGui" only due to the fact that I didn't give it a proper name when I released it. However, the term IMGUI (immediate-mode graphical user interface) was coined before and is being used in variety of other situations. It seemed confusing and unfair to hog the name. To reduce the ambiguity without affecting existing codebases, I have decided on an alternate, longer name "dear imgui" that people can use to refer to this specific library in ambiguous situations.
 
 **How can I tell whether to dispatch mouse/keyboard to imgui or to my application?**
 <br>**How can I display an image? What is ImTextureID, how does it works?**
-<br>**How can I have multiple widgets with the same label or without a label? A primer on labels and the ID Stack.**
+<br>**How can I have multiple widgets with the same label or with an empty label? A primer on labels and the ID Stack.**
 <br>**How can I use my own math types instead of ImVec2/ImVec4?**
 <br>**How can I load a different font than the default?**
 <br>**How can I easily use icons in my application?**
 <br>**How can I load multiple fonts?**
-<br>**How can I display and input non-latin characters such as Chinese, Japanese, Korean, Cyrillic?**
+<br>**How can I display and input non-latin characters such as Chinese, Japanese, Korean, Cyrillic?** ([example](https://github.com/ocornut/imgui/wiki/Loading-Font-Example))
+<br>**How can I interact with standard C++ types (such as std::string and std::vector)?**
 <br>**How can I use the drawing facilities without an Dear ImGui window? (using ImDrawList API)**
+<br>**How can I use this without a mouse, without a keyboard or without a screen? (gamepad, input share, remote display)**
 <br>**I integrated Dear ImGui in my engine and the text or lines are blurry..**
 <br>**I integrated Dear ImGui in my engine and some elements are disappearing when I move windows around..**
 <br>**How can I help?**
 
 See the FAQ in imgui.cpp for answers.
 
-**How do you use Dear ImGui on a platform that may not have a mouse or keyboard?**
-
-You can control Dear ImGui with a gamepad, see the explanation in imgui.cpp about how to use the navigation feature (short version: map your gamepad inputs into the `io.NavInputs[]` array and set `io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad`).
-
-You can share your computer mouse seamlessly with your console/tablet/phone using [Synergy](http://synergy-project.org). This is the preferred solution for developer productivity. In particular, their [micro-synergy-client](https://github.com/symless/micro-synergy-client) repo there is _uSynergy.c_ sources for a small embeddable that you can use on any platform to connect to your host PC using Synergy 1.x. You may also use a third party solution such as [Remote ImGui](https://github.com/JordiRos/remoteimgui).
-
-For touch inputs, you can increase the hit box of widgets (via the _style.TouchPadding_ setting) to accommodate a little for the lack of precision of touch inputs, but it is recommended you use a mouse or gamepad to allow optimizing for screen real-estate and precision.
-
 **Can you create elaborate/serious tools with Dear ImGui?**
 
 Yes. People have written game editors, data browsers, debuggers, profilers and all sort of non-trivial tools with the library. In my experience the simplicity of the API is very empowering. Your UI runs close to your live data. Make the tools always-on and everybody in the team will be inclined to create new tools (as opposed to more "offline" UI toolkits where only a fraction of your team effectively creates tools). The list of sponsors below is also an indicator that serious game teams have been using the library.
@@ -291,30 +274,39 @@ There is an auto-generated [c-api for Dear ImGui (cimgui)](https://github.com/ci
 Support dear imgui
 ------------------
 
+**How can I help?**
+
+- You may participate in the [Discourse forums](https://discourse.dearimgui.org) and the GitHub [issues tracker](https://github.com/ocornut/imgui/issues).
+- You may help with development and submit pull requests! Please understand that by submitting a PR you are also submitting a request for the maintainer to review your code and then take over its maintenance forever. PR should be crafted both in the interest in the end-users and also to ease the maintainer into understanding and accepting it.
+- See [Help wanted](https://github.com/ocornut/imgui/wiki/Help-Wanted) on the [Wiki](https://github.com/ocornut/imgui/wiki/) for some more ideas.
+- Convince your company to financially support this project.
+
 **How can I help financing further development of Dear ImGui?**
 
-Your contributions are keeping the library alive. If you are an individual using dear imgui, please consider donating to enable me to spend more time improving the library.
+Your contributions are keeping this project alive. The library is free as in freedom, but continued maintenance and development are a full-time endeavor. In addition to maintenance and stability there are many desirable features yet to be added. If your company is using dear imgui, please consider reaching out for financial support. If you are an individual using dear imgui, please consider donating via Patreon or PayPal. Thank you!
 
-Monthly donations via Patreon:
-<br>[![Patreon](https://cloud.githubusercontent.com/assets/8225057/5990484/70413560-a9ab-11e4-8942-1a63607c0b00.png)](http://www.patreon.com/imgui)
+Individuals/hobbyists: support continued maintenance and development via the monthly Patreon:
+<br>&nbsp;&nbsp;[![Patreon](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/patreon_01.png)](http://www.patreon.com/imgui)
 
-One-off donations via PayPal:
-<br>[![PayPal](https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=5Q73FPZ9C526U)
+Individuals/hobbyists: support continued maintenance and development via PayPal:
+<br>&nbsp;&nbsp;[![PayPal](https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=5Q73FPZ9C526U)
 
-Ongoing dear imgui development is financially supported on [**Patreon**](http://www.patreon.com/imgui) and by private sponsors.
-If your company uses dear imgui, please consider financial support (e.g. sponsoring a few weeks/months of development. I can also invoice for private support, custom development etc. contact me for details: omarcornut at gmail). Thanks! 
+Businesses: support continued maintenance and development via support contracts or sponsoring:
+<br>&nbsp;&nbsp;_E-mail: omarcornut at gmail dot com_
+
+Ongoing dear imgui development is financially supported by users and private sponsors (past and present):
 
 **Platinum-chocolate sponsors**
-- Blizzard Entertainment.
+- **Blizzard Entertainment**.
 
 **Double-chocolate sponsors**
-- Media Molecule, Mobigame, Insomniac Games, Aras Pranckevičius, Lizardcube, Greggman, DotEmu, Nadeo, Supercell, Runner.
+- Media Molecule, Mobigame, Insomniac Games, Aras Pranckevičius, Lizardcube, Greggman, DotEmu, Nadeo, Supercell, Runner, Aiden Koss, Kylotonn.
 
 **Salty caramel supporters**
-- Jetha Chan, Wild Sheep Studio, Pastagames, Mārtiņš Možeiko, Daniel Collin, Recognition Robotics, Chris Genova, ikrima, Glenn Fiedler, Geoffrey Evans, Dakko Dakko, Mercury Labs, Singularity Demo Group, Mischa Alff, Sebastien Ronsse, Lionel Landwerlin, Nikolay Ivanov, Ron Gilbert, Brandon Townsend, Nikhil Deshpande, Cort Stratton, drudru, Harfang 3D, Jeff Roberts.
+- Jetha Chan, Wild Sheep Studio, Pastagames, Mārtiņš Možeiko, Daniel Collin, Recognition Robotics, Chris Genova, ikrima, Glenn Fiedler, Geoffrey Evans, Dakko Dakko, Mercury Labs, Singularity Demo Group, Mischa Alff, Sebastien Ronsse, Lionel Landwerlin, Nikolay Ivanov, Ron Gilbert, Brandon Townsend, Nikhil Deshpande, Cort Stratton, drudru, Harfang 3D, Jeff Roberts, Rainway inc.
 
 **Caramel supporters**
-- Michel Courtine, César Leblic, Dale Kim, Alex Evans, Rui Figueira, Paul Patrashcu, Jerome Lanquetot, Ctrl Alt Ninja, Paul Fleming, Neil Henning, Stephan Dilly, Neil Blakey-Milner, Aleksei, NeiloGD, Justin Paver, FiniteSol, Vincent Pancaldi, James Billot, Robin Hübner, furrtek, Eric, Simon Barratt, Game Atelier, Julian Bosch, Simon Lundmark, Vincent Hamm, Farhan Wali, Matt Reyer, Colin Riley, Victor Martins, Josh Simmons, Garrett Hoofman, Sergio Gonzales, Andrew Berridge, Roy Eltham, Game Preservation Society, Kit framework, Josh Faust, Martin Donlon, Quinton, Felix, Andrew Belt, Codecat, Cort Stratton, Claudio Canepa, Doug McNabb, Emmanuel Julien, Guillaume Chereau, Jeffrey Slutter, Jeremiah Deckard, r-lyeh, Roger Clark, Nekith, Joshua Fisher, Malte Hoffmann, Mustafa Karaalioglu, Merlyn Morgan-Graham, Per Vognsen, Fabian Giesen, Jan Staubach, Matt Hargett, John Shearer, Jesse Chounard, kingcoopa, Miloš Tošić, Jonas Bernemann, Johan Andersson, Nathan Hartman, Michael Labbe, Tomasz Golebiowski, Louis Schnellbach, Felipe Alfonso, Jimmy Andrews, Bojan Endrovski, Robin Berg Pettersen, Rachel Crawford, Edsel Malasig, Andrew Johnson, Sean Hunter, Jordan Mellow, Nefarius Software Solutions, Laura Wieme, Robert Nix, Mick Honey, Astrofra, Jonas Lehmann, Steven Kah Hien Wong, Bartosz Bielecki, Oscar Penas, A M, Liam Moynihan, Artometa.
+- Michel Courtine, César Leblic, Dale Kim, Alex Evans, Rui Figueira, Paul Patrashcu, Jerome Lanquetot, Ctrl Alt Ninja, Paul Fleming, Neil Henning, Stephan Dilly, Neil Blakey-Milner, Aleksei, NeiloGD, Justin Paver, FiniteSol, Vincent Pancaldi, James Billot, Robin Hübner, furrtek, Eric, Simon Barratt, Game Atelier, Julian Bosch, Simon Lundmark, Vincent Hamm, Farhan Wali, Matt Reyer, Colin Riley, Victor Martins, Josh Simmons, Garrett Hoofman, Sergio Gonzales, Andrew Berridge, Roy Eltham, Game Preservation Society, Kit framework, Josh Faust, Martin Donlon, Quinton, Felix, Andrew Belt, Codecat, Cort Stratton, Claudio Canepa, Doug McNabb, Emmanuel Julien, Guillaume Chereau, Jeffrey Slutter, Jeremiah Deckard, r-lyeh, Roger Clark, Nekith, Joshua Fisher, Malte Hoffmann, Mustafa Karaalioglu, Merlyn Morgan-Graham, Per Vognsen, Fabian Giesen, Jan Staubach, Matt Hargett, John Shearer, Jesse Chounard, kingcoopa, Miloš Tošić, Jonas Bernemann, Johan Andersson, Nathan Hartman, Michael Labbe, Tomasz Golebiowski, Louis Schnellbach, Felipe Alfonso, Jimmy Andrews, Bojan Endrovski, Robin Berg Pettersen, Rachel Crawford, Edsel Malasig, Andrew Johnson, Sean Hunter, Jordan Mellow, Nefarius Software Solutions, Laura Wieme, Robert Nix, Mick Honey, Astrofra, Jonas Lehmann, Steven Kah Hien Wong, Bartosz Bielecki, Oscar Penas, A M, Liam Moynihan, Artometa, Mark Lee, Dimitri Diakopoulos.
 
 And all other supporters; THANK YOU!
 (Please contact me if you would like to be added or removed from this list)
@@ -324,7 +316,7 @@ Credits
 
 Developed by [Omar Cornut](http://www.miracleworld.net) and every direct or indirect contributors to the GitHub. The early version of this library was developed with the support of [Media Molecule](http://www.mediamolecule.com) and first used internally on the game [Tearaway](http://tearaway.mediamolecule.com). 
 
-I first discovered imgui principles at [Q-Games](http://www.q-games.com) where Atman had dropped his own simple imgui implementation in the codebase, which I spent quite some time improving and thinking about. It turned out that Atman was exposed to the concept directly by working with Casey. When I moved to Media Molecule I rewrote a new library trying to overcome the flaws and limitations of the first one I've worked with. It became this library and since then I have spent an unreasonable amount of time iterating on it. 
+I first discovered the IMGUI paradigm at [Q-Games](http://www.q-games.com) where Atman had dropped his own simple implementation in the codebase, which I spent quite some time improving and thinking about. It turned out that Atman was exposed to the concept directly by working with Casey. When I moved to Media Molecule I rewrote a new library trying to overcome the flaws and limitations of the first one I've worked with. It became this library and since then I have spent an unreasonable amount of time iterating on it. 
 
 Embeds [ProggyClean.ttf](http://upperbounds.net) font by Tristan Grimmer (MIT license).
 

docs/TODO.txt

@@ -8,16 +8,12 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - doc/test: add a proper documentation+regression testing system (#435)
  - doc/test: checklist app to verify binding/integration of imgui (test inputs, rendering, callback, etc.).
  - doc/tips: tips of the day: website? applet in imgui_club?
- - project: folder or separate repository with maintained helpers (e.g. imgui_memory_editor.h, imgui_stl.h, maybe imgui_dock would be there?)
 
  - window: calling SetNextWindowSize() every frame with <= 0 doesn't do anything, may be useful to allow (particularly when used for a single axis). (#690)
  - window: add a way for very transient windows (non-saved, temporary overlay over hundreds of objects) to "clean" up from the global window list. perhaps a lightweight explicit cleanup pass.
  - window: auto-fit feedback loop when user relies on any dynamic layout (window width multiplier, column) appears weird to end-user. clarify.
  - window: allow resizing of child windows (possibly given min/max for each axis?.)
  - window: background options for child windows, border option (disable rounding).
- - window: resizing from any sides? done. > need backends to honor mouse cursors properly. (#822)
- - window: resize from borders: support some form of outer padding to make it easier to grab borders. (#822)
- - window: fix resize glitch when collapsing an AlwaysAutoResize window.
  - window: begin with *p_open == false could return false.
  - window: get size/pos helpers given names (see discussion in #249)
  - window: a collapsed window can be stuck behind the main menu bar?
@@ -28,8 +24,11 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - window: expose contents size. (#1045)
  - window: using SetWindowPos() inside Begin() and moving the window with the mouse reacts a very ugly glitch. We should just defer the SetWindowPos() call.
  - window: GetWindowSize() returns (0,0) when not calculated? (#1045)
- - window: freeze window flag: if not focused/hovered, return false, render with previous ImDrawList. and/or reduce refresh rate. 
  - window: investigate better auto-positioning for new windows.
+ - window/opt: freeze window flag: if not focused/hovered, return false, render with previous ImDrawList. and/or reduce refresh rate. 
+ - window/child: the first draw command of a child window could be moved into the current draw command of the parent window (unless child+tooltip?).
+ - window/clipping: some form of clipping when DisplaySize (or corresponding viewport) is zero.
+ - scrolling: while holding down a scrollbar, try to keep the same contents visible (at least while not moving mouse)
  - scrolling: allow immediately effective change of scroll after Begin() if we haven't appended items yet.
  - scrolling/clipping: separator on the initial position of a window is not visible (cursorpos.y <= clippos.y). (2017-08-20: can't repro)
  - scrolling/style: shadows on scrollable areas to denote that there is more contents
@@ -74,6 +73,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - input text: display bug when clicking a drag/slider after an input text in a different window has all-selected text (order dependent). actually a very old bug but no one appears to have noticed it.
  - input text: allow centering/positioning text so that ctrl+clicking Drag or Slider keeps the textual value at the same pixel position.
  - input text: what's the easiest way to implement a nice IP/Mac address input editor?
+ - input text: Global callback system so user can plug in an expression evaluator easily.
  - input text multi-line: don't directly call AddText() which does an unnecessary vertex reserve for character count prior to clipping. and/or more line-based clipping to AddText(). and/or reorganize TextUnformatted/RenderText for more efficiency for large text (e.g TextUnformatted could clip and log separately, etc).
  - input text multi-line: support for cut/paste without selection (cut/paste the current line)
  - input text multi-line: line numbers? status bar? (follow up on #200)
@@ -96,7 +96,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  
  - columns: sizing policy (e.g. for each column: fixed size, %, fill, distribute default size among fills) (#513, #125)
  - columns: add a conditional parameter to SetColumnOffset() (#513, #125)
- - columns: headers. reorderable. (#513, #125)
+ - columns: headers. re-orderable. (#513, #125)
  - columns: optional sorting modifiers (up/down), sort list so sorting can be done multi-criteria. notify user when sort order changed.
  - columns: option to alternate background colors on odd/even scanlines.  
  - columns: allow columns to recurse. 
@@ -123,14 +123,15 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
 
  - splitter/separator: formalize the splitter idiom into an official api (we want to handle n-way split) (#319)
  
- - dock: docking extension
+ - dock: merge docking branch (#2109)
  - dock: dock out from a collapsing header? would work nicely but need emitting window to keep submitting the code.
 
- - tabs: re-ordering, close buttons, context menu, persistent order (#261, #351)
+ - tabs: make EndTabBar fail if users doesn't respect BeginTabBar return value, for consistency/future-proofing.
+ - tabs: persistent order/focus in BeginTabBar() api (#261, #351)
 
  - ext: stl-ish friendly extension (imgui_stl.h) that has wrapper for std::string, std::vector etc.
 
- - button: provide a button that looks framed.
+ - button: provide a button that looks framed. (?)
  - image/image button: misalignment on padded/bordered button?
  - image/image button: parameters are confusing, image() has tint_col,border_col whereas imagebutton() has bg_col/tint_col. Even thou they are different parameters ordering could be more consistent. can we fix that?
  - image button: not taking an explicit id is odd.
@@ -142,7 +143,9 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - slider: step option (#1183)
  - slider style: fill % of the bar instead of positioning a drag.
  - knob: rotating knob widget (#942)
+ - drag float: power/logarithmic slider and drags are weird. (#1316)
  - drag float: up/down axis
+ - drag float: power != 0.0f with current value being outside the the range keeps the value stuck.
  - drag float: added leeway on edge (e.g. a few invisible steps past the clamp limits)
 
  - combo: use clipper: make it easier to disable clipper with a single flag.
@@ -198,7 +201,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - settings: api for per-tool simple persistent data (bool,int,float,columns sizes,etc.) in .ini file (#437)
  - stb: add defines to disable stb implementations
 
-!- style: better default styles. (#707)
+ - style: better default styles. (#707)
  - style: add a highlighted text color (for headers, etc.)
  - style: border types: out-screen, in-screen, etc. (#447)
  - style: add window shadow (fading away from the window. Paint-style calculation of vertices alpha after drawlist would be easier)
@@ -219,6 +222,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - filters: handle wild-cards (with implicit leading/trailing *), reg-exprs
  - filters: fuzzy matches (may use code at blog.forrestthewoods.com/4cffeed33fdb)
 
+ - drag and drop: releasing a drop shows the "..." tooltip for one frame - since e13e598 (#1725)
  - drag and drop: have some way to know when a drag begin from BeginDragDropSource() pov.
  - drag and drop: allow preview tooltip to be submitted from a different place than the drag source. (#1725)
  - drag and drop: allow using with other mouse buttons (where activeid won't be set). (#1637)
@@ -231,9 +235,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - pie menus patterns (#434)
  - markup: simple markup language for color change? (#902)
 
-!- font: need handling of missing glyphs by not packing/rasterizing glyph 0 of a given font.
- - font: MergeMode: flags to select overwriting or not.
- - font: MergeMode: duplicate glyphs are stored in the atlas texture which is suboptimal.
+ - font: MergeMode: flags to select overwriting or not (this is now very easy with refactored ImFontAtlasBuildWithStbTruetype)
  - font: free the Alpha buffer if user only requested RGBA.
 !- font: better CalcTextSizeA() API, at least for simple use cases. current one is horrible (perhaps have simple vs extended versions).
  - font: a CalcTextHeight() helper could run faster than CalcTextSize().y
@@ -241,6 +243,8 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - font: finish CustomRectRegister() to allow mapping Unicode codepoint to custom texture data 
  - font: PushFontSize API (#1018)
  - font: MemoryTTF taking ownership confusing/not obvious, maybe default should be opposite?
+ - font/demo: add tools to show glyphs used by a text blob, display U16 value, list missing glyphs.
+ - font/demo: demonstrate use of ImFontGlyphRangesBuilder.
  - font/atlas: add a missing Glyphs.reserve()
  - font/atlas: incremental updates
  - font/atlas: dynamic font atlas to avoid baking huge ranges into bitmap and make scaling easier.
@@ -248,13 +252,16 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - font/draw: vertical and/or rotated text renderer (#705) - vertical is easier clipping wise
  - font/draw: need to be able to specify wrap start position.
  - font/draw: better reserve policy for large horizontal block of text (shouldn't reserve for all clipped lines)
- - font: imgui_freetype.h alternative renderer (#618)
- - font: optimization: for monospace font (like the default one) we can trim IndexXAdvance as long as trailing value is == FallbackXAdvance (need to make sure TAB is still correct).
+ - font: optimization: for monospace font (like the default one) we can trim IndexXAdvance as long as trailing value is == FallbackXAdvance (need to make sure TAB is still correct), would save on cache line.
  - font: add support for kerning, probably optional. A) perhaps default to (32..128)^2 matrix ~ 9K entries = 36KB, then hash for non-ascii?. B) or sparse lookup into per-char list?
  - font: add a simpler CalcTextSizeA() api? current one ok but not welcome if user needs to call it directly (without going through ImGui::CalcTextSize)
  - font: fix AddRemapChar() to work before font has been built.
- - font: (api breaking) removed "TTF" from symbol names. also because it now supports OTF.
+ - font: what would it take to support codepoint higher than 0xFFFF? (smileys, etc.)
+ - font: (api breaking) remove "TTF" from symbol names. also because it now supports OTF.
+ - font/opt: Considering storing standalone AdvanceX table as 16-bit fixed point integer?
+ - font/opt: Glyph currently 40 bytes (2+9*4). Consider storing UV as 16 bits integer? (->32 bytes). X0/Y0/X1/Y1 as 16 fixed-point integers? Or X0/Y0 as float and X1/Y1 as fixed8_8?
 
+ - nav: NavScrollToBringItemIntoView() with item bigger than view should focus top-right? Repro: using Nav in "About Window"
  - nav: wrap around logic to allow e.g. grid based layout (pressing NavRight on the right-most element would go to the next row, etc.). see internal's NavMoveRequestTryWrapping().
  - nav: patterns to make it possible for arrows key to update selection
  - nav: restore/find nearest navid when current one disappear (e.g. pressed a button that disappear, or perhaps auto restoring when current button change name)
@@ -266,8 +273,10 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - nav: NavFlattened: init request doesn't select items that are part of a NavFlattened child
  - nav: NavFlattened: cannot access menu-bar of a flattened child window with Alt/menu key (not a very common use case..).
  - nav: Left within a tree node block as a fallback (ImGuiTreeNodeFlags_NavLeftJumpsBackHere by default?)
- - nav: menus: pressing left-right on a vertically clipped menu bar tends to jump to the collapse/close buttons.
- - nav: menus: allow pressing Menu to leave a sub-menu.
+ - nav/menus: pressing left-right on a vertically clipped menu bar tends to jump to the collapse/close buttons.
+ - nav/menus: allow pressing Menu to leave a sub-menu.
+ - nav/menus: a way to access the main menu bar with Alt? (currently needs CTRL+TAB)
+ - nav/menus: when using the main menu bar, even though we restore focus after, the underlying window loses its title bar highlight during menu manipulation. could we prevent it?
  - nav: simulate right-click or context activation? (SHIFT+F10)
  - nav: tabs should go through most/all widgets (in submission order?).
  - nav: when CTRL-Tab/windowing is active, the HoveredWindow detection doesn't take account of the window display re-ordering.
@@ -285,13 +294,12 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - inputs/io: backspace and arrows in the context of a text input could use system repeat rate.
  - inputs/io: clarify/standardize/expose repeat rate and repeat delays (#1808)
 
- - misc: idle refresh: expose cursor blink animation timer for backend to be able to lower framerate.
+ - misc: idle: expose "woken up" boolean (set by inputs) and/or animation time (for cursor blink) for back-end to be able stop refreshing easily.
+ - misc: idle: if cursor blink if the _only_ visible animation, core imgui could rewrite vertex alpha to avoid CPU pass on ImGui:: calls.
  - misc: make the ImGuiCond values linear (non-power-of-two). internal storage for ImGuiWindow can use integers to combine into flags (Why?)
  - misc: provide a way to compile out the entire implementation while providing a dummy API (e.g. #define IMGUI_DUMMY_IMPL)
  - misc: PushItemFlag(): add a flag to disable keyboard capture when used with mouse? (#1682)
  - misc: use more size_t in public api?
- - misc: ImVector: erase_unsorted() helper
- - misc: imgui_cpp: perhaps a misc/ header file with more friendly helper (e.g. type-infer versions of DragScalar, vector<> variants if appropriate for some functions).
 
  - backend: bgfx? https://gist.github.com/RichardGale/6e2b74bc42b3005e08397236e4be0fd0
  - web/emscriptem: refactor some examples to facilitate integration with emscripten main loop system. (#1713, #336)
@@ -302,7 +310,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - demo: find a way to demonstrate textures in the examples application, as it such a a common issue for new users.
  - demo: add vertical separator demo
  - demo: add virtual scrolling example?
- - demo: demonstration Plot offset
+ - demo: demonstrate Plot offset
  - examples: window minimize, maximize (#583)
  - examples: provide a zero frame-rate/idle example.
  - examples: apple: example_apple should be using modern GL3.
@@ -310,6 +318,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - optimization: replace vsnprintf with stb_printf? or enable the defines/infrastructure to allow it (#1038)
  - optimization: add clipping for multi-component widgets (SliderFloatX, ColorEditX, etc.). one problem is that nav branch can't easily clip parent group when there is a move request.
  - optimization: add a flag to disable most of rendering, for the case where the user expect to skip it (#335)
+ - optimization: fully covered window (covered by another with non-translucent bg + WindowRounding worth of padding) may want to clip rendering.
  - optimization: use another hash function than crc32, e.g. FNV1a
  - optimization/render: merge command-lists with same clip-rect into one even if they aren't sequential? (as long as in-between clip rectangle don't overlap)?
  - optimization: turn some the various stack vectors into statically-sized arrays

docs/issue_template.md

@@ -1,11 +1,12 @@
 (Click "Preview" to turn any http URL into a clickable link)
 
-1. IF YOU ARE HAVING AN ISSUE COMPILING/LINKING/RUNNING/DISPLAYING/ADDING FONTS/WIRING INPUTS, please post on the "Getting Started" Discourse forum:
+1. PLEASE CAREFULLY READ:
+https://github.com/ocornut/imgui/issues/2261
+
+2. IF YOU ARE HAVING AN ISSUE COMPILING/LINKING/RUNNING/DISPLAYING/ADDING FONTS, please post on the "Getting Started" Discourse forum:
 https://discourse.dearimgui.org/c/getting-started
 
-2. You may use this Issue Tracker to ask for help and submit bug reports, feature requests or suggestions that don't fit in any category of (1). PLEASE CAREFULLY READ THE CONTRIBUTING DOCUMENT before submitting any issue: https://github.com/ocornut/imgui/blob/master/.github/CONTRIBUTING.md
-
-3. PLEASE MAKE SURE that you have: read the FAQ in imgui.cpp; explored the contents of ShowDemoWindow() including the Examples menu; searched among Issues; used your IDE to search for keywords in all sources and text files; and read the CONTRIBUTING.md file linked above.
+3. PLEASE MAKE SURE that you have: read the FAQ in imgui.cpp; explored the contents of ShowDemoWindow() including the Examples menu; searched among Issues; used your IDE to search for keywords in all sources and text files; and read the link provided in (1).
 
 4. Delete points 1-4 and PLEASE FILL THE TEMPLATE BELOW before submitting your issue. 
 
@@ -21,19 +22,21 @@ Branch: XXX _(master/viewport/docking/etc.)_
 **Back-end/Renderer/Compiler/OS** 
 
 Back-ends: imgui_impl_XXX.cpp + imgui_impl_XXX.cpp _(or specify if using a custom engine/back-end)_
-Compiler: XXX _(if the question is related to building)_
+Compiler: XXX _(if the question is related to building or platform specific features)_
 Operating System: XXX 
 
-**My Issue/Question:** _(please provide context)_
+**My Issue/Question:** 
 
-XXX
+XXX _(please provide as much context as possible)_
 
-**Standalone, minimal, complete and verifiable example:** _(see CONTRIBUTING.md)_
+**Screenshots/Video** 
+
+XXX _(you can drag files here)_
+
+**Standalone, minimal, complete and verifiable example:** _(see https://github.com/ocornut/imgui/issues/2261)_
 ```
 // Please do not forget this!
 ImGui::Begin("Example Bug");
 MoreCodeToExplainMyIssue();
 ImGui::End();
 ```
-
-**Screenshots/Video** _(you can drag files here)_

docs/pull_request_template.md

@@ -0,0 +1,6 @@
+(Click "Preview" to turn any http URL into a clickable link)
+
+PLEASE CAREFULLY READ:
+https://github.com/ocornut/imgui/issues/2261
+
+(Clear this template before submitting your PR)

examples/example_allegro5/main.cpp

@@ -28,13 +28,13 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
 
-    // Setup Platform/Renderer bindings
-    ImGui_ImplAllegro5_Init(display);
-
-    // Setup Style
+    // Setup Dear ImGui style
     ImGui::StyleColorsDark();
     //ImGui::StyleColorsClassic();
 
+    // Setup Platform/Renderer bindings
+    ImGui_ImplAllegro5_Init(display);
+
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them. 
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple. 

examples/example_apple_metal/Shared/Renderer.mm

@@ -26,11 +26,9 @@
 
         IMGUI_CHECKVERSION();
         ImGui::CreateContext();
-        (void)ImGui::GetIO();
+        ImGui::StyleColorsDark();
 
         ImGui_ImplMetal_Init(_device);
-
-        ImGui::StyleColorsDark();
     }
 
     return self;

examples/example_apple_metal/example_apple_metal.xcodeproj/project.pbxproj

@@ -231,14 +231,16 @@
 				TargetAttributes = {
 					8307E7C320E9F9C900473790 = {
 						CreatedOnToolsVersion = 9.4.1;
+						ProvisioningStyle = Automatic;
 					};
 					8307E7D920E9F9C900473790 = {
 						CreatedOnToolsVersion = 9.4.1;
+						ProvisioningStyle = Automatic;
 					};
 				};
 			};
 			buildConfigurationList = 8307E7B920E9F9C700473790 /* Build configuration list for PBXProject "example_apple_metal" */;
-			compatibilityVersion = "Xcode 9.3";
+			compatibilityVersion = "Xcode 8.0";
 			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
@@ -444,10 +446,7 @@
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = "$(SRCROOT)/iOS/Info-iOS.plist";
 				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
-				LD_RUNPATH_SEARCH_PATHS = (
-					"$(inherited)",
-					"@executable_path/Frameworks",
-				);
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "org.imgui.example.apple-metal-ios";
 				PRODUCT_NAME = example_apple_metal;
 				SDKROOT = iphoneos;
@@ -463,10 +462,7 @@
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = "$(SRCROOT)/iOS/Info-iOS.plist";
 				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
-				LD_RUNPATH_SEARCH_PATHS = (
-					"$(inherited)",
-					"@executable_path/Frameworks",
-				);
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "org.imgui.example.apple-metal-ios";
 				PRODUCT_NAME = example_apple_metal;
 				SDKROOT = iphoneos;
@@ -483,11 +479,8 @@
 				COMBINE_HIDPI_IMAGES = YES;
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = "$(SRCROOT)/macOS/Info-macOS.plist";
-				LD_RUNPATH_SEARCH_PATHS = (
-					"$(inherited)",
-					"@executable_path/../Frameworks",
-				);
-				MACOSX_DEPLOYMENT_TARGET = 10.13;
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks";
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				PRODUCT_BUNDLE_IDENTIFIER = "org.imgui.example.apple-metal-macos";
 				PRODUCT_NAME = example_apple_metal;
 				SDKROOT = macosx;
@@ -502,11 +495,8 @@
 				COMBINE_HIDPI_IMAGES = YES;
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = "$(SRCROOT)/macOS/Info-macOS.plist";
-				LD_RUNPATH_SEARCH_PATHS = (
-					"$(inherited)",
-					"@executable_path/../Frameworks",
-				);
-				MACOSX_DEPLOYMENT_TARGET = 10.13;
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks";
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				PRODUCT_BUNDLE_IDENTIFIER = "org.imgui.example.apple-metal-macos";
 				PRODUCT_NAME = example_apple_metal;
 				SDKROOT = macosx;

examples/example_apple_opengl2/example_apple_opengl2.xcodeproj/project.pbxproj

@@ -135,11 +135,12 @@
 				TargetAttributes = {
 					4080A96A20B029B00036BA46 = {
 						CreatedOnToolsVersion = 9.3.1;
+						ProvisioningStyle = Automatic;
 					};
 				};
 			};
 			buildConfigurationList = 4080A96620B029B00036BA46 /* Build configuration list for PBXProject "example_apple_opengl2" */;
-			compatibilityVersion = "Xcode 9.3";
+			compatibilityVersion = "Xcode 8.0";
 			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
@@ -286,6 +287,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CODE_SIGN_STYLE = Automatic;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SYSTEM_HEADER_SEARCH_PATHS = ../libs/gl3w;
 				USER_HEADER_SEARCH_PATHS = ../..;
@@ -296,6 +298,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CODE_SIGN_STYLE = Automatic;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SYSTEM_HEADER_SEARCH_PATHS = ../libs/gl3w;
 				USER_HEADER_SEARCH_PATHS = ../..;

examples/example_apple_opengl2/main.mm

@@ -243,14 +243,14 @@
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
 
+    // Setup Dear ImGui style
+    ImGui::StyleColorsDark();
+    //ImGui::StyleColorsClassic();
+
     // Setup Platform/Renderer bindings
     ImGui_ImplOSX_Init();
     ImGui_ImplOpenGL2_Init();
 
-    // Setup Style
-    ImGui::StyleColorsDark();
-    //ImGui::StyleColorsClassic();
-
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.

examples/example_freeglut_opengl2/main.cpp

@@ -100,15 +100,15 @@ int main(int argc, char** argv)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
 
+    // Setup Dear ImGui style
+    ImGui::StyleColorsDark();
+    //ImGui::StyleColorsClassic();
+
     // Setup Platform/Renderer bindings
     ImGui_ImplFreeGLUT_Init();
     ImGui_ImplFreeGLUT_InstallFuncs();
     ImGui_ImplOpenGL2_Init();
 
-    // Setup Style
-    ImGui::StyleColorsDark();
-    //ImGui::StyleColorsClassic();
-
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them. 
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple. 

examples/example_glfw_opengl2/main.cpp

@@ -43,14 +43,14 @@ int main(int, char**)
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;   // Enable Gamepad Controls
 
+    // Setup Dear ImGui style
+    ImGui::StyleColorsDark();
+    //ImGui::StyleColorsClassic();
+
     // Setup Platform/Renderer bindings
     ImGui_ImplGlfw_InitForOpenGL(window, true);
     ImGui_ImplOpenGL2_Init();
 
-    // Setup Style
-    ImGui::StyleColorsDark();
-    //ImGui::StyleColorsClassic();
-
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them. 
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple. 

examples/example_glfw_opengl3/main.cpp

@@ -89,14 +89,14 @@ int main(int, char**)
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;   // Enable Gamepad Controls
 
+    // Setup Dear ImGui style
+    ImGui::StyleColorsDark();
+    //ImGui::StyleColorsClassic();
+
     // Setup Platform/Renderer bindings
     ImGui_ImplGlfw_InitForOpenGL(window, true);
     ImGui_ImplOpenGL3_Init(glsl_version);
 
-    // Setup Style
-    ImGui::StyleColorsDark();
-    //ImGui::StyleColorsClassic();
-
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.

examples/example_glfw_vulkan/main.cpp

@@ -357,6 +357,10 @@ int main(int, char**)
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;   // Enable Gamepad Controls
 
+    // Setup Dear ImGui style
+    ImGui::StyleColorsDark();
+    //ImGui::StyleColorsClassic();
+
     // Setup Platform/Renderer bindings
     ImGui_ImplGlfw_InitForVulkan(window, true);
     ImGui_ImplVulkan_InitInfo init_info = {};
@@ -371,10 +375,6 @@ int main(int, char**)
     init_info.CheckVkResultFn = check_vk_result;
     ImGui_ImplVulkan_Init(&init_info, wd->RenderPass);
 
-    // Setup Style
-    ImGui::StyleColorsDark();
-    //ImGui::StyleColorsClassic();
-
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them. 
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple. 

examples/example_marmalade/main.cpp

@@ -22,13 +22,13 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
 
-    // Setup Platform/Renderer bindings
-    ImGui_Marmalade_Init(true);
-
-    // Setup Style
+    // Setup Dear ImGui style
     ImGui::StyleColorsDark();
     //ImGui::StyleColorsClassic();
 
+    // Setup Platform/Renderer bindings
+    ImGui_Marmalade_Init(true);
+
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them. 
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple. 

examples/example_sdl_opengl2/main.cpp

@@ -40,14 +40,14 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
 
+    // Setup Dear ImGui style
+    ImGui::StyleColorsDark();
+    //ImGui::StyleColorsClassic();
+
     // Setup Platform/Renderer bindings
     ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
     ImGui_ImplOpenGL2_Init();
 
-    // Setup Style
-    ImGui::StyleColorsDark();
-    //ImGui::StyleColorsClassic();
-
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them. 
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple. 

examples/example_sdl_opengl3/main.cpp

@@ -80,14 +80,14 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
 
+    // Setup Dear ImGui style
+    ImGui::StyleColorsDark();
+    //ImGui::StyleColorsClassic();
+
     // Setup Platform/Renderer bindings
     ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
     ImGui_ImplOpenGL3_Init(glsl_version);
 
-    // Setup Style
-    ImGui::StyleColorsDark();
-    //ImGui::StyleColorsClassic();
-
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them. 
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple. 

examples/example_sdl_vulkan/main.cpp

@@ -338,6 +338,10 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
 
+    // Setup Dear ImGui style
+    ImGui::StyleColorsDark();
+    //ImGui::StyleColorsClassic();
+
     // Setup Platform/Renderer bindings
     ImGui_ImplSDL2_InitForVulkan(window);
     ImGui_ImplVulkan_InitInfo init_info = {};
@@ -352,10 +356,6 @@ int main(int, char**)
     init_info.CheckVkResultFn = check_vk_result;
     ImGui_ImplVulkan_Init(&init_info, wd->RenderPass);
 
-    // Setup Style
-    ImGui::StyleColorsDark();
-    //ImGui::StyleColorsClassic();
-
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them. 
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple. 

examples/example_win32_directx10/main.cpp

@@ -116,14 +116,14 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
 
+    // Setup Dear ImGui style
+    ImGui::StyleColorsDark();
+    //ImGui::StyleColorsClassic();
+
     // Setup Platform/Renderer bindings
     ImGui_ImplWin32_Init(hwnd);
     ImGui_ImplDX10_Init(g_pd3dDevice);
 
-    // Setup Style
-    ImGui::StyleColorsDark();
-    //ImGui::StyleColorsClassic();
-
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them. 
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple. 

examples/example_win32_directx11/main.cpp

@@ -119,14 +119,14 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
 
+    // Setup Dear ImGui style
+    ImGui::StyleColorsDark();
+    //ImGui::StyleColorsClassic();
+
     // Setup Platform/Renderer bindings
     ImGui_ImplWin32_Init(hwnd);
     ImGui_ImplDX11_Init(g_pd3dDevice, g_pd3dDeviceContext);
 
-    // Setup Style
-    ImGui::StyleColorsDark();
-    //ImGui::StyleColorsClassic();
-
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them. 
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple. 

examples/example_win32_directx12/main.cpp

@@ -292,6 +292,10 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
 
+    // Setup Dear ImGui style
+    ImGui::StyleColorsDark();
+    //ImGui::StyleColorsClassic();
+
     // Setup Platform/Renderer bindings
     ImGui_ImplWin32_Init(hwnd);
     ImGui_ImplDX12_Init(g_pd3dDevice, NUM_FRAMES_IN_FLIGHT, 
@@ -299,10 +303,6 @@ int main(int, char**)
         g_pd3dSrvDescHeap->GetCPUDescriptorHandleForHeapStart(), 
         g_pd3dSrvDescHeap->GetGPUDescriptorHandleForHeapStart());
 
-    // Setup Style
-    ImGui::StyleColorsDark();
-    //ImGui::StyleColorsClassic();
-
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them. 
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple. 

examples/example_win32_directx9/main.cpp

@@ -81,14 +81,14 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
 
+    // Setup Dear ImGui style
+    ImGui::StyleColorsDark();
+    //ImGui::StyleColorsClassic();
+
     // Setup Platform/Renderer bindings
     ImGui_ImplWin32_Init(hwnd);
     ImGui_ImplDX9_Init(g_pd3dDevice);
 
-    // Setup Style
-    ImGui::StyleColorsDark();
-    //ImGui::StyleColorsClassic();
-
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them. 
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple. 

examples/imgui_impl_allegro5.cpp

@@ -280,9 +280,14 @@ bool ImGui_ImplAllegro5_Init(ALLEGRO_DISPLAY* display)
 void ImGui_ImplAllegro5_Shutdown()
 {
     ImGui_ImplAllegro5_InvalidateDeviceObjects();
-    g_Display = NULL;
 
-    // Destroy last known clipboard data
+    g_Display = NULL;
+    g_Time = 0.0;
+
+    if (g_VertexDecl)
+        al_destroy_vertex_decl(g_VertexDecl);
+    g_VertexDecl = NULL;
+
     if (g_ClipboardTextData)
         al_free(g_ClipboardTextData);
     g_ClipboardTextData = NULL;

examples/imgui_impl_dx10.cpp

@@ -10,6 +10,7 @@
 
 // CHANGELOG 
 // (minor and older changes stripped away, please see git history for details)
+//  2018-12-03: Misc: Added #pragma comment statement to automatically link with d3dcompiler.lib when using D3DCompile().
 //  2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
 //  2018-07-13: DirectX10: Fixed unreleased resources in Init and Shutdown functions.
 //  2018-06-08: Misc: Extracted imgui_impl_dx10.cpp/.h away from the old combined DX10+Win32 example.
@@ -27,6 +28,9 @@
 #include <d3d10_1.h>
 #include <d3d10.h>
 #include <d3dcompiler.h>
+#ifdef _MSC_VER
+#pragma comment(lib, "d3dcompiler") // Automatically link with d3dcompiler.lib as we are using D3DCompile() below.
+#endif
 
 // DirectX data
 static ID3D10Device*            g_pd3dDevice = NULL;

examples/imgui_impl_dx11.cpp

@@ -10,6 +10,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2018-12-03: Misc: Added #pragma comment statement to automatically link with d3dcompiler.lib when using D3DCompile().
 //  2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
 //  2018-08-01: DirectX11: Querying for IDXGIFactory instead of IDXGIFactory1 to increase compatibility.
 //  2018-07-13: DirectX11: Fixed unreleased resources in Init and Shutdown functions.
@@ -26,6 +27,9 @@
 #include <stdio.h>
 #include <d3d11.h>
 #include <d3dcompiler.h>
+#ifdef _MSC_VER
+#pragma comment(lib, "d3dcompiler") // Automatically link with d3dcompiler.lib as we are using D3DCompile() below.
+#endif
 
 // DirectX data
 static ID3D11Device*            g_pd3dDevice = NULL;

examples/imgui_impl_dx12.cpp

@@ -12,6 +12,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2018-12-03: Misc: Added #pragma comment statement to automatically link with d3dcompiler.lib when using D3DCompile().
 //  2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
 //  2018-06-12: DirectX12: Moved the ID3D12GraphicsCommandList* parameter from NewFrame() to RenderDrawData().
 //  2018-06-08: Misc: Extracted imgui_impl_dx12.cpp/.h away from the old combined DX12+Win32 example.
@@ -25,6 +26,9 @@
 #include <d3d12.h>
 #include <dxgi1_4.h>
 #include <d3dcompiler.h>
+#ifdef _MSC_VER
+#pragma comment(lib, "d3dcompiler") // Automatically link with d3dcompiler.lib as we are using D3DCompile() below.
+#endif
 
 // DirectX data
 static ID3D12Device*                g_pd3dDevice = NULL;

examples/imgui_impl_glfw.cpp

@@ -1,6 +1,7 @@
 // dear imgui: Platform Binding for GLFW
 // This needs to be used along with a Renderer (e.g. OpenGL3, Vulkan..)
 // (Info: GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
+// (Requires: GLFW 3.1+)
 
 // Implemented features:
 //  [X] Platform: Clipboard support.
@@ -267,9 +268,9 @@ static void ImGui_ImplGlfw_UpdateMouseCursor()
 void ImGui_ImplGlfw_NewFrame()
 {
     ImGuiIO& io = ImGui::GetIO();
-    IM_ASSERT(io.Fonts->IsBuilt());     // Font atlas needs to be built, call renderer _NewFrame() function e.g. ImGui_ImplOpenGL3_NewFrame() 
+    IM_ASSERT(io.Fonts->IsBuilt() && "Font atlas not built! It is generally built by the renderer back-end. Missing call to renderer _NewFrame() function? e.g. ImGui_ImplOpenGL3_NewFrame().");
 
-    // Setup display size
+    // Setup display size (every frame to accommodate for window resizing)
     int w, h;
     int display_w, display_h;
     glfwGetWindowSize(g_Window, &w, &h);

examples/imgui_impl_metal.mm

@@ -17,7 +17,7 @@
 #include "imgui_impl_metal.h"
 
 #import <Metal/Metal.h>
-#import <QuartzCore/CAMetalLayer.h>
+// #import <QuartzCore/CAMetalLayer.h> // Not suported in XCode 9.2. Maybe a macro to detect the SDK version can be used (something like #if MACOS_SDK >= 10.13 ...)
 #import <simd/simd.h>
 
 #pragma mark - Support classes

examples/imgui_impl_sdl.cpp

@@ -1,6 +1,7 @@
 // dear imgui: Platform Binding for SDL2
 // This needs to be used along with a Renderer (e.g. DirectX11, OpenGL3, Vulkan..)
 // (Info: SDL2 is a cross-platform general purpose library for handling windows, inputs, graphics context creation, etc.)
+// (Requires: SDL 2.0. Prefer SDL 2.0.4+ for full feature support.)
 
 // Implemented features:
 //  [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
@@ -16,6 +17,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2018-12-21: Inputs: Workaround for Android/iOS which don't seem to handle focus related calls.
 //  2018-11-30: Misc: Setting up io.BackendPlatformName so it can be displayed in the About Window.
 //  2018-11-14: Changed the signature of ImGui_ImplSDL2_ProcessEvent() to take a 'const SDL_Event*'.
 //  2018-08-01: Inputs: Workaround for Emscripten which doesn't seem to handle focus related calls.
@@ -42,10 +44,12 @@
 // (the multi-viewports feature requires SDL features supported from SDL 2.0.5+)
 #include <SDL.h>
 #include <SDL_syswm.h>
+#if defined(__APPLE__)
+#include "TargetConditionals.h"
+#endif
 
-#define SDL_HAS_CAPTURE_MOUSE               SDL_VERSION_ATLEAST(2,0,4)
+#define SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE    SDL_VERSION_ATLEAST(2,0,4)
 #define SDL_HAS_VULKAN                      SDL_VERSION_ATLEAST(2,0,6)
-#define SDL_HAS_MOUSE_FOCUS_CLICKTHROUGH    SDL_VERSION_ATLEAST(2,0,5)
 #if !SDL_HAS_VULKAN
 static const Uint32 SDL_WINDOW_VULKAN = 0x10000000;
 #endif
@@ -220,7 +224,7 @@ static void ImGui_ImplSDL2_UpdateMousePosAndButtons()
     io.MouseDown[2] = g_MousePressed[2] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0;
     g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false;
 
-#if SDL_HAS_CAPTURE_MOUSE && !defined(__EMSCRIPTEN__)
+#if SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE && !defined(__EMSCRIPTEN__) && !defined(__ANDROID__) && !(defined(__APPLE__) && TARGET_OS_IOS)
     SDL_Window* focused_window = SDL_GetKeyboardFocus();
     if (g_Window == focused_window)
     {
@@ -267,7 +271,7 @@ static void ImGui_ImplSDL2_UpdateMouseCursor()
 void ImGui_ImplSDL2_NewFrame(SDL_Window* window)
 {
     ImGuiIO& io = ImGui::GetIO();
-    IM_ASSERT(io.Fonts->IsBuilt());     // Font atlas needs to be built, call renderer _NewFrame() function e.g. ImGui_ImplOpenGL3_NewFrame() 
+    IM_ASSERT(io.Fonts->IsBuilt() && "Font atlas not built! It is generally built by the renderer back-end. Missing call to renderer _NewFrame() function? e.g. ImGui_ImplOpenGL3_NewFrame().");
 
     // Setup display size (every frame to accommodate for window resizing)
     int w, h;

examples/imgui_impl_win32.cpp

@@ -142,6 +142,7 @@ static void ImGui_ImplWin32_UpdateMousePos()
 void    ImGui_ImplWin32_NewFrame()
 {
     ImGuiIO& io = ImGui::GetIO();
+    IM_ASSERT(io.Fonts->IsBuilt() && "Font atlas not built! It is generally built by the renderer back-end. Missing call to renderer _NewFrame() function? e.g. ImGui_ImplOpenGL3_NewFrame().");
 
     // Setup display size (every frame to accommodate for window resizing)
     RECT rect;

imgui.h

@@ -1,9 +1,9 @@
-// dear imgui, v1.66b
+// dear imgui, v1.67
 // (headers)
 
 // See imgui.cpp file for documentation.
 // Call and read ImGui::ShowDemoWindow() in imgui_demo.cpp for demo code.
-// Read 'Programmer guide' in imgui.cpp for notes on how to setup ImGui in your codebase.
+// Newcomers, read 'Programmer guide' below for notes on how to setup Dear ImGui in your codebase.
 // Get latest version at https://github.com/ocornut/imgui
 
 /*
@@ -13,13 +13,14 @@ Index of this file:
 // Forward declarations and basic types
 // ImGui API (Dear ImGui end-user API)
 // Flags & Enumerations
+// ImVector<>
 // ImGuiStyle
 // ImGuiIO
 // Misc data structures (ImGuiInputTextCallbackData, ImGuiSizeCallbackData, ImGuiPayload)
 // Obsolete functions
-// Helpers (ImVector, ImGuiOnceUponAFrame, ImGuiTextFilter, ImGuiTextBuffer, ImGuiStorage, ImGuiListClipper, ImColor)
+// Helpers (ImGuiOnceUponAFrame, ImGuiTextFilter, ImGuiTextBuffer, ImGuiStorage, ImGuiListClipper, ImColor)
 // Draw List API (ImDrawCmd, ImDrawIdx, ImDrawVert, ImDrawChannel, ImDrawListFlags, ImDrawList, ImDrawData)
-// Font API (ImFontConfig, ImFontGlyph, ImFontAtlasFlags, ImFontAtlas, ImFont)
+// Font API (ImFontConfig, ImFontGlyph, ImFontGlyphRangesBuilder, ImFontAtlasFlags, ImFontAtlas, ImFont)
 
 */
 
@@ -44,8 +45,8 @@ Index of this file:
 
 // Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals. Work in progress versions typically starts at XYY00 then bounced up to XYY01 when release tagging happens)
-#define IMGUI_VERSION               "1.66b"
-#define IMGUI_VERSION_NUM           16602
+#define IMGUI_VERSION               "1.67"
+#define IMGUI_VERSION_NUM           16603
 #define IMGUI_CHECKVERSION()        ImGui::DebugCheckVersionAndDataLayout(IMGUI_VERSION, sizeof(ImGuiIO), sizeof(ImGuiStyle), sizeof(ImVec2), sizeof(ImVec4), sizeof(ImDrawVert))
 
 // Define attributes of all API symbols declarations (e.g. for DLL under Windows)
@@ -76,6 +77,7 @@ Index of this file:
 #if defined(__clang__)
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wold-style-cast"
+#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
 #elif defined(__GNUC__) && __GNUC__ >= 8
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wclass-memaccess"
@@ -85,20 +87,19 @@ Index of this file:
 // Forward declarations and basic types
 //-----------------------------------------------------------------------------
 
-struct ImDrawChannel;               // Temporary storage for outputting drawing commands out of order, used by ImDrawList::ChannelsSplit()
-struct ImDrawCmd;                   // A single draw command within a parent ImDrawList (generally maps to 1 GPU draw call)
-struct ImDrawData;                  // All draw command lists required to render the frame
+struct ImDrawChannel;               // Temporary storage for ImDrawList ot output draw commands out of order, used by ImDrawList::ChannelsSplit()
+struct ImDrawCmd;                   // A single draw command within a parent ImDrawList (generally maps to 1 GPU draw call, unless it is a callback)
+struct ImDrawData;                  // All draw command lists required to render the frame + pos/size coordinates to use for the projection matrix.
 struct ImDrawList;                  // A single draw command list (generally one per window, conceptually you may see this as a dynamic "mesh" builder)
 struct ImDrawListSharedData;        // Data shared among multiple draw lists (typically owned by parent ImGui context, but you may create one yourself)
-struct ImDrawVert;                  // A single vertex (20 bytes by default, override layout with IMGUI_OVERRIDE_DRAWVERT_STRUCT_LAYOUT)
+struct ImDrawVert;                  // A single vertex (pos + uv + col = 20 bytes by default. Override layout with IMGUI_OVERRIDE_DRAWVERT_STRUCT_LAYOUT)
 struct ImFont;                      // Runtime data for a single font within a parent ImFontAtlas
 struct ImFontAtlas;                 // Runtime data for multiple fonts, bake multiple fonts into a single texture, TTF/OTF font loader
 struct ImFontConfig;                // Configuration data when adding a font or merging fonts
-struct ImColor;                     // Helper functions to create a color that can be converted to either u32 or float4 (*obsolete* please avoid using)
-#ifndef ImTextureID
-typedef void* ImTextureID;          // User data to identify a texture (this is whatever to you want it to be! read the FAQ about ImTextureID in imgui.cpp)
-#endif
-struct ImGuiContext;                // ImGui context (opaque)
+struct ImFontGlyph;                 // A single font glyph (code point + coordinates within in ImFontAtlas + offset)
+struct ImFontGlyphRangesBuilder;    // Helper to build glyph ranges from text/string data
+struct ImColor;                     // Helper functions to create a color that can be converted to either u32 or float4 (*OBSOLETE* please avoid using)
+struct ImGuiContext;                // Dear ImGui context (opaque structure, unless including imgui_internal.h)
 struct ImGuiIO;                     // Main configuration and I/O between your application and ImGui
 struct ImGuiInputTextCallbackData;  // Shared state of InputText() when using custom ImGuiInputTextCallback (rare/advanced use)
 struct ImGuiListClipper;            // Helper to manually clip large list of items
@@ -107,13 +108,16 @@ struct ImGuiPayload;                // User data payload for drag and drop opera
 struct ImGuiSizeCallbackData;       // Callback data when using SetNextWindowSizeConstraints() (rare/advanced use)
 struct ImGuiStorage;                // Helper for key->value storage
 struct ImGuiStyle;                  // Runtime data for styling/colors
-struct ImGuiTextFilter;             // Helper to parse and apply text filters (e.g. "aaaaa[,bbbb][,ccccc]")
 struct ImGuiTextBuffer;             // Helper to hold and append into a text buffer (~string builder)
+struct ImGuiTextFilter;             // Helper to parse and apply text filters (e.g. "aaaaa[,bbbb][,ccccc]")
 
 // Typedefs and Enums/Flags (declared as int for compatibility with old C++, to allow using as flags and to not pollute the top of this file)
 // Use your programming IDE "Go to definition" facility on the names of the center columns to find the actual flags/enum lists.
+#ifndef ImTextureID
+typedef void* ImTextureID;          // User data to identify a texture (this is whatever to you want it to be! read the FAQ about ImTextureID in imgui.cpp)
+#endif
 typedef unsigned int ImGuiID;       // Unique ID used by widgets (typically hashed from a stack of string)
-typedef unsigned short ImWchar;     // Character for keyboard input/display
+typedef unsigned short ImWchar;     // A single U16 character for keyboard input/display. We encode them as multi bytes UTF-8 when used in strings.
 typedef int ImGuiCol;               // -> enum ImGuiCol_             // Enum: A color identifier for styling
 typedef int ImGuiCond;              // -> enum ImGuiCond_            // Enum: A condition for Set*()
 typedef int ImGuiDataType;          // -> enum ImGuiDataType_        // Enum: A primary data type
@@ -135,6 +139,8 @@ typedef int ImGuiFocusedFlags;      // -> enum ImGuiFocusedFlags_    // Flags: f
 typedef int ImGuiHoveredFlags;      // -> enum ImGuiHoveredFlags_    // Flags: for IsItemHovered(), IsWindowHovered() etc.
 typedef int ImGuiInputTextFlags;    // -> enum ImGuiInputTextFlags_  // Flags: for InputText*()
 typedef int ImGuiSelectableFlags;   // -> enum ImGuiSelectableFlags_ // Flags: for Selectable()
+typedef int ImGuiTabBarFlags;       // -> enum ImGuiTabBarFlags_     // Flags: for BeginTabBar()
+typedef int ImGuiTabItemFlags;      // -> enum ImGuiTabItemFlags_    // Flags: for BeginTabItem()
 typedef int ImGuiTreeNodeFlags;     // -> enum ImGuiTreeNodeFlags_   // Flags: for TreeNode*(),CollapsingHeader()
 typedef int ImGuiWindowFlags;       // -> enum ImGuiWindowFlags_     // Flags: for Begin*()
 typedef int (*ImGuiInputTextCallback)(ImGuiInputTextCallbackData *data);
@@ -220,9 +226,13 @@ namespace ImGui
     // Windows
     // - Begin() = push window to the stack and start appending to it. End() = pop window from the stack.
     // - You may append multiple times to the same window during the same frame.
-    // - Passing 'bool* p_open != NULL' shows a window-closing widget in the upper-right corner of the window, which clicking will set the boolean to false when clicked.
-    // - Begin() return false to indicate the window is collapsed or fully clipped, so you may early out and omit submitting anything to the window.
-    //   Always call a matching End() for each Begin() call, regardless of its return value [this is due to legacy reason and is inconsistent with most other functions such as BeginMenu/EndMenu, BeginPopup/EndPopup, etc. where the EndXXX call should only be called if the corresponding BeginXXX function returned true.]
+    // - Passing 'bool* p_open != NULL' shows a window-closing widget in the upper-right corner of the window, 
+    //   which clicking will set the boolean to false when clicked.
+    // - Begin() return false to indicate the window is collapsed or fully clipped, so you may early out and omit submitting
+    //   anything to the window. Always call a matching End() for each Begin() call, regardless of its return value!
+    //   [this is due to legacy reason and is inconsistent with most other functions such as BeginMenu/EndMenu, BeginPopup/EndPopup, etc. 
+    //    where the EndXXX call should only be called if the corresponding BeginXXX function returned true.]
+    // - Note that the bottom of window stack always contains a window called "Debug".
     IMGUI_API bool          Begin(const char* name, bool* p_open = NULL, ImGuiWindowFlags flags = 0);
     IMGUI_API void          End();
 
@@ -236,6 +246,7 @@ namespace ImGui
     IMGUI_API void          EndChild();
 
     // Windows Utilities
+    // - "current window" = the window we are appending into while inside a Begin()/End() block. "next window" = next window we will Begin() into.
     IMGUI_API bool          IsWindowAppearing();
     IMGUI_API bool          IsWindowCollapsed();
     IMGUI_API bool          IsWindowFocused(ImGuiFocusedFlags flags=0); // is current window focused? or its root/child, depending on flags. see flags for options.
@@ -277,7 +288,7 @@ namespace ImGui
     IMGUI_API void          SetScrollX(float scroll_x);                                     // set scrolling amount [0..GetScrollMaxX()]
     IMGUI_API void          SetScrollY(float scroll_y);                                     // set scrolling amount [0..GetScrollMaxY()]
     IMGUI_API void          SetScrollHereY(float center_y_ratio = 0.5f);                    // adjust scrolling amount to make current cursor position visible. center_y_ratio=0.0: top, 0.5: center, 1.0: bottom. When using to make a "default/current item" visible, consider using SetItemDefaultFocus() instead.
-    IMGUI_API void          SetScrollFromPosY(float pos_y, float center_y_ratio = 0.5f);    // adjust scrolling amount to make given position valid. use GetCursorPos() or GetCursorStartPos()+offset to get valid positions.
+    IMGUI_API void          SetScrollFromPosY(float local_y, float center_y_ratio = 0.5f);  // adjust scrolling amount to make given position valid. use GetCursorPos() or GetCursorStartPos()+offset to get valid positions.
 
     // Parameters stacks (shared)
     IMGUI_API void          PushFont(ImFont* font);                                         // use NULL as a shortcut to push default font
@@ -300,7 +311,7 @@ namespace ImGui
     IMGUI_API void          PushItemWidth(float item_width);                                // width of items for the common item+label case, pixels. 0.0f = default to ~2/3 of windows width, >0.0f: width in pixels, <0.0f align xx pixels to the right of window (so -1.0f always align width to the right side)
     IMGUI_API void          PopItemWidth();
     IMGUI_API float         CalcItemWidth();                                                // width of item given pushed settings and current cursor position
-    IMGUI_API void          PushTextWrapPos(float wrap_pos_x = 0.0f);                       // word-wrapping for Text*() commands. < 0.0f: no wrapping; 0.0f: wrap to end of window (or column); > 0.0f: wrap at 'wrap_pos_x' position in window local space
+    IMGUI_API void          PushTextWrapPos(float wrap_local_pos_x = 0.0f);                 // word-wrapping for Text*() commands. < 0.0f: no wrapping; 0.0f: wrap to end of window (or column); > 0.0f: wrap at 'wrap_pos_x' position in window local space
     IMGUI_API void          PopTextWrapPos();
     IMGUI_API void          PushAllowKeyboardFocus(bool allow_keyboard_focus);              // allow focusing using TAB/Shift-TAB, enabled by default but you can disable it for certain widgets
     IMGUI_API void          PopAllowKeyboardFocus();
@@ -308,24 +319,26 @@ namespace ImGui
     IMGUI_API void          PopButtonRepeat();
 
     // Cursor / Layout
+    // - By "cursor" we mean the current output position. 
+    // - The typical widget behavior is to output themselves at the current cursor position, then move the cursor one line down.
     IMGUI_API void          Separator();                                                    // separator, generally horizontal. inside a menu bar or in horizontal layout mode, this becomes a vertical separator.
-    IMGUI_API void          SameLine(float pos_x = 0.0f, float spacing_w = -1.0f);          // call between widgets or groups to layout them horizontally
-    IMGUI_API void          NewLine();                                                      // undo a SameLine()
-    IMGUI_API void          Spacing();                                                      // add vertical spacing
-    IMGUI_API void          Dummy(const ImVec2& size);                                      // add a dummy item of given size
+    IMGUI_API void          SameLine(float local_pos_x = 0.0f, float spacing_w = -1.0f);    // call between widgets or groups to layout them horizontally. X position given in window coordinates.
+    IMGUI_API void          NewLine();                                                      // undo a SameLine() or force a new line when in an horizontal-layout context.
+    IMGUI_API void          Spacing();                                                      // add vertical spacing.
+    IMGUI_API void          Dummy(const ImVec2& size);                                      // add a dummy item of given size. unlike InvisibleButton(), Dummy() won't take the mouse click or be navigable into.
     IMGUI_API void          Indent(float indent_w = 0.0f);                                  // move content position toward the right, by style.IndentSpacing or indent_w if != 0
     IMGUI_API void          Unindent(float indent_w = 0.0f);                                // move content position back to the left, by style.IndentSpacing or indent_w if != 0
-    IMGUI_API void          BeginGroup();                                                   // lock horizontal starting position + capture group bounding box into one "item" (so you can use IsItemHovered() or layout primitives such as SameLine() on whole group, etc.)
-    IMGUI_API void          EndGroup();
-    IMGUI_API ImVec2        GetCursorPos();                                                 // cursor position is relative to window position
-    IMGUI_API float         GetCursorPosX();                                                // "
-    IMGUI_API float         GetCursorPosY();                                                // "
-    IMGUI_API void          SetCursorPos(const ImVec2& local_pos);                          // "
-    IMGUI_API void          SetCursorPosX(float x);                                         // "
-    IMGUI_API void          SetCursorPosY(float y);                                         // "
-    IMGUI_API ImVec2        GetCursorStartPos();                                            // initial cursor position
+    IMGUI_API void          BeginGroup();                                                   // lock horizontal starting position
+    IMGUI_API void          EndGroup();                                                     // unlock horizontal starting position + capture the whole group bounding box into one "item" (so you can use IsItemHovered() or layout primitives such as SameLine() on whole group, etc.)
+    IMGUI_API ImVec2        GetCursorPos();                                                 // cursor position in window coordinates (relative to window position)
+    IMGUI_API float         GetCursorPosX();                                                //   (some functions are using window-relative coordinates, such as: GetCursorPos, GetCursorStartPos, GetContentRegionMax, GetWindowContentRegion* etc.
+    IMGUI_API float         GetCursorPosY();                                                //    other functions such as GetCursorScreenPos or everything in ImDrawList::
+    IMGUI_API void          SetCursorPos(const ImVec2& local_pos);                          //    are using the main, absolute coordinate system.
+    IMGUI_API void          SetCursorPosX(float local_x);                                   //    GetWindowPos() + GetCursorPos() == GetCursorScreenPos() etc.)
+    IMGUI_API void          SetCursorPosY(float local_y);                                   // 
+    IMGUI_API ImVec2        GetCursorStartPos();                                            // initial cursor position in window coordinates
     IMGUI_API ImVec2        GetCursorScreenPos();                                           // cursor position in absolute screen coordinates [0..io.DisplaySize] (useful to work with ImDrawList API)
-    IMGUI_API void          SetCursorScreenPos(const ImVec2& screen_pos);                   // cursor position in absolute screen coordinates [0..io.DisplaySize]
+    IMGUI_API void          SetCursorScreenPos(const ImVec2& pos);                          // cursor position in absolute screen coordinates [0..io.DisplaySize]
     IMGUI_API void          AlignTextToFramePadding();                                      // vertically align upcoming text baseline to FramePadding.y so that it will align properly to regularly framed items (call if you have text on a line before a framed item)
     IMGUI_API float         GetTextLineHeight();                                            // ~ FontSize
     IMGUI_API float         GetTextLineHeightWithSpacing();                                 // ~ FontSize + style.ItemSpacing.y (distance in pixels between 2 consecutive lines of text)
@@ -333,16 +346,16 @@ namespace ImGui
     IMGUI_API float         GetFrameHeightWithSpacing();                                    // ~ FontSize + style.FramePadding.y * 2 + style.ItemSpacing.y (distance in pixels between 2 consecutive lines of framed widgets)
 
     // ID stack/scopes
-    // Read the FAQ for more details about how ID are handled in dear imgui. If you are creating widgets in a loop you most
+    // - Read the FAQ for more details about how ID are handled in dear imgui. If you are creating widgets in a loop you most
     //   likely want to push a unique identifier (e.g. object pointer, loop index) to uniquely differentiate them.
-    // You can also use the "##foobar" syntax within widget label to distinguish them from each others.
-    // In this header file we use the "label"/"name" terminology to denote a string that will be displayed and used as an ID,
-    // whereas "str_id" denote a string that is only used as an ID and not aimed to be displayed.
-    IMGUI_API void          PushID(const char* str_id);                                     // push identifier into the ID stack. IDs are hash of the entire stack!
+    // - You can also use the "Label##foobar" syntax within widget label to distinguish them from each others.
+    // - In this header file we use the "label"/"name" terminology to denote a string that will be displayed and used as an ID,
+    //   whereas "str_id" denote a string that is only used as an ID and not normally displayed.
+    IMGUI_API void          PushID(const char* str_id);                                     // push string identifier into the ID stack. IDs == hash of the entire stack!
     IMGUI_API void          PushID(const char* str_id_begin, const char* str_id_end);
-    IMGUI_API void          PushID(const void* ptr_id);
-    IMGUI_API void          PushID(int int_id);
-    IMGUI_API void          PopID();
+    IMGUI_API void          PushID(const void* ptr_id);                                     // push pointer into the ID stack.
+    IMGUI_API void          PushID(int int_id);                                             // push integer into the ID stack.
+    IMGUI_API void          PopID();                                                        // pop from the ID stack.
     IMGUI_API ImGuiID       GetID(const char* str_id);                                      // calculate unique ID (hash of whole ID stack + given parameter). e.g. if you want to query into ImGuiStorage yourself
     IMGUI_API ImGuiID       GetID(const char* str_id_begin, const char* str_id_end);
     IMGUI_API ImGuiID       GetID(const void* ptr_id);
@@ -363,7 +376,7 @@ namespace ImGui
     IMGUI_API void          BulletTextV(const char* fmt, va_list args)                      IM_FMTLIST(1);
 
     // Widgets: Main
-    // Most widgets return true when the value has been changed or when pressed/selected
+    // - Most widgets return true when the value has been changed or when pressed/selected
     IMGUI_API bool          Button(const char* label, const ImVec2& size = ImVec2(0,0));    // button
     IMGUI_API bool          SmallButton(const char* label);                                 // button with FramePadding=(0,0) to easily embed within text
     IMGUI_API bool          InvisibleButton(const char* str_id, const ImVec2& size);        // button behavior without the visuals, useful to build custom behaviors using the public api (along with IsItemActive, IsItemHovered, etc.)
@@ -378,18 +391,19 @@ namespace ImGui
     IMGUI_API void          Bullet();                                                       // draw a small circle and keep the cursor on the same line. advance cursor x position by GetTreeNodeToLabelSpacing(), same distance that TreeNode() uses
 
     // Widgets: Combo Box
-    // The new BeginCombo()/EndCombo() api allows you to manage your contents and selection state however you want it, by creating e.g. Selectable() items.
-    // The old Combo() api are helpers over BeginCombo()/EndCombo() which are kept available for convenience purpose.
+    // - The new BeginCombo()/EndCombo() api allows you to manage your contents and selection state however you want it, by creating e.g. Selectable() items.
+    // - The old Combo() api are helpers over BeginCombo()/EndCombo() which are kept available for convenience purpose.
     IMGUI_API bool          BeginCombo(const char* label, const char* preview_value, ImGuiComboFlags flags = 0);
     IMGUI_API void          EndCombo(); // only call EndCombo() if BeginCombo() returns true!
     IMGUI_API bool          Combo(const char* label, int* current_item, const char* const items[], int items_count, int popup_max_height_in_items = -1);
     IMGUI_API bool          Combo(const char* label, int* current_item, const char* items_separated_by_zeros, int popup_max_height_in_items = -1);      // Separate items with \0 within a string, end item-list with \0\0. e.g. "One\0Two\0Three\0"
     IMGUI_API bool          Combo(const char* label, int* current_item, bool(*items_getter)(void* data, int idx, const char** out_text), void* data, int items_count, int popup_max_height_in_items = -1);
 
-    // Widgets: Drags (tip: ctrl+click on a drag box to input with keyboard. manually input values aren't clamped, can go off-bounds)
-    // For all the Float2/Float3/Float4/Int2/Int3/Int4 versions of every functions, note that a 'float v[X]' function argument is the same as 'float* v', the array syntax is just a way to document the number of elements that are expected to be accessible. You can pass address of your first element out of a contiguous set, e.g. &myvector.x
-    // Adjust format string to decorate the value with a prefix, a suffix, or adapt the editing and display precision e.g. "%.3f" -> 1.234; "%5.2f secs" -> 01.23 secs; "Biscuit: %.0f" -> Biscuit: 1; etc.
-    // Speed are per-pixel of mouse movement (v_speed=0.2f: mouse needs to move by 5 pixels to increase value by 1). For gamepad/keyboard navigation, minimum speed is Max(v_speed, minimum_step_at_given_precision).
+    // Widgets: Drags
+    // - CTRL+Click on any drag box to turn them into an input box. Manually input values aren't clamped and can go off-bounds.
+    // - For all the Float2/Float3/Float4/Int2/Int3/Int4 versions of every functions, note that a 'float v[X]' function argument is the same as 'float* v', the array syntax is just a way to document the number of elements that are expected to be accessible. You can pass address of your first element out of a contiguous set, e.g. &myvector.x
+    // - Adjust format string to decorate the value with a prefix, a suffix, or adapt the editing and display precision e.g. "%.3f" -> 1.234; "%5.2f secs" -> 01.23 secs; "Biscuit: %.0f" -> Biscuit: 1; etc.
+    // - Speed are per-pixel of mouse movement (v_speed=0.2f: mouse needs to move by 5 pixels to increase value by 1). For gamepad/keyboard navigation, minimum speed is Max(v_speed, minimum_step_at_given_precision).
     IMGUI_API bool          DragFloat(const char* label, float* v, float v_speed = 1.0f, float v_min = 0.0f, float v_max = 0.0f, const char* format = "%.3f", float power = 1.0f);     // If v_min >= v_max we have no bound
     IMGUI_API bool          DragFloat2(const char* label, float v[2], float v_speed = 1.0f, float v_min = 0.0f, float v_max = 0.0f, const char* format = "%.3f", float power = 1.0f);
     IMGUI_API bool          DragFloat3(const char* label, float v[3], float v_speed = 1.0f, float v_min = 0.0f, float v_max = 0.0f, const char* format = "%.3f", float power = 1.0f);
@@ -403,8 +417,9 @@ namespace ImGui
     IMGUI_API bool          DragScalar(const char* label, ImGuiDataType data_type, void* v, float v_speed, const void* v_min = NULL, const void* v_max = NULL, const char* format = NULL, float power = 1.0f);
     IMGUI_API bool          DragScalarN(const char* label, ImGuiDataType data_type, void* v, int components, float v_speed, const void* v_min = NULL, const void* v_max = NULL, const char* format = NULL, float power = 1.0f);
 
-    // Widgets: Sliders (tip: ctrl+click on a slider to input with keyboard. manually input values aren't clamped, can go off-bounds)
-    // Adjust format string to decorate the value with a prefix, a suffix, or adapt the editing and display precision e.g. "%.3f" -> 1.234; "%5.2f secs" -> 01.23 secs; "Biscuit: %.0f" -> Biscuit: 1; etc.
+    // Widgets: Sliders
+    // - CTRL+Click on any slider to turn them into an input box. Manually input values aren't clamped and can go off-bounds.
+    // - Adjust format string to decorate the value with a prefix, a suffix, or adapt the editing and display precision e.g. "%.3f" -> 1.234; "%5.2f secs" -> 01.23 secs; "Biscuit: %.0f" -> Biscuit: 1; etc.
     IMGUI_API bool          SliderFloat(const char* label, float* v, float v_min, float v_max, const char* format = "%.3f", float power = 1.0f);     // adjust format to decorate the value with a prefix or a suffix for in-slider labels or unit display. Use power!=1.0 for power curve sliders
     IMGUI_API bool          SliderFloat2(const char* label, float v[2], float v_min, float v_max, const char* format = "%.3f", float power = 1.0f);
     IMGUI_API bool          SliderFloat3(const char* label, float v[3], float v_min, float v_max, const char* format = "%.3f", float power = 1.0f);
@@ -421,23 +436,24 @@ namespace ImGui
     IMGUI_API bool          VSliderScalar(const char* label, const ImVec2& size, ImGuiDataType data_type, void* v, const void* v_min, const void* v_max, const char* format = NULL, float power = 1.0f);
 
     // Widgets: Input with Keyboard
-    // If you want to use InputText() with a dynamic string type such as std::string or your own, see misc/cpp/imgui_stdlib.h
+    // - If you want to use InputText() with a dynamic string type such as std::string or your own, see misc/cpp/imgui_stdlib.h
+    // - Most of the ImGuiInputTextFlags flags are only useful for InputText() and not for InputFloatX, InputIntX, InputDouble etc.
     IMGUI_API bool          InputText(const char* label, char* buf, size_t buf_size, ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
     IMGUI_API bool          InputTextMultiline(const char* label, char* buf, size_t buf_size, const ImVec2& size = ImVec2(0,0), ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
-    IMGUI_API bool          InputFloat(const char* label, float* v, float step = 0.0f, float step_fast = 0.0f, const char* format = "%.3f", ImGuiInputTextFlags extra_flags = 0);
-    IMGUI_API bool          InputFloat2(const char* label, float v[2], const char* format = "%.3f", ImGuiInputTextFlags extra_flags = 0);
-    IMGUI_API bool          InputFloat3(const char* label, float v[3], const char* format = "%.3f", ImGuiInputTextFlags extra_flags = 0);
-    IMGUI_API bool          InputFloat4(const char* label, float v[4], const char* format = "%.3f", ImGuiInputTextFlags extra_flags = 0);
-    IMGUI_API bool          InputInt(const char* label, int* v, int step = 1, int step_fast = 100, ImGuiInputTextFlags extra_flags = 0);
-    IMGUI_API bool          InputInt2(const char* label, int v[2], ImGuiInputTextFlags extra_flags = 0);
-    IMGUI_API bool          InputInt3(const char* label, int v[3], ImGuiInputTextFlags extra_flags = 0);
-    IMGUI_API bool          InputInt4(const char* label, int v[4], ImGuiInputTextFlags extra_flags = 0);
-    IMGUI_API bool          InputDouble(const char* label, double* v, double step = 0.0f, double step_fast = 0.0f, const char* format = "%.6f", ImGuiInputTextFlags extra_flags = 0);
-    IMGUI_API bool          InputScalar(const char* label, ImGuiDataType data_type, void* v, const void* step = NULL, const void* step_fast = NULL, const char* format = NULL, ImGuiInputTextFlags extra_flags = 0);
-    IMGUI_API bool          InputScalarN(const char* label, ImGuiDataType data_type, void* v, int components, const void* step = NULL, const void* step_fast = NULL, const char* format = NULL, ImGuiInputTextFlags extra_flags = 0);
+    IMGUI_API bool          InputFloat(const char* label, float* v, float step = 0.0f, float step_fast = 0.0f, const char* format = "%.3f", ImGuiInputTextFlags flags = 0);
+    IMGUI_API bool          InputFloat2(const char* label, float v[2], const char* format = "%.3f", ImGuiInputTextFlags flags = 0);
+    IMGUI_API bool          InputFloat3(const char* label, float v[3], const char* format = "%.3f", ImGuiInputTextFlags flags = 0);
+    IMGUI_API bool          InputFloat4(const char* label, float v[4], const char* format = "%.3f", ImGuiInputTextFlags flags = 0);
+    IMGUI_API bool          InputInt(const char* label, int* v, int step = 1, int step_fast = 100, ImGuiInputTextFlags flags = 0);
+    IMGUI_API bool          InputInt2(const char* label, int v[2], ImGuiInputTextFlags flags = 0);
+    IMGUI_API bool          InputInt3(const char* label, int v[3], ImGuiInputTextFlags flags = 0);
+    IMGUI_API bool          InputInt4(const char* label, int v[4], ImGuiInputTextFlags flags = 0);
+    IMGUI_API bool          InputDouble(const char* label, double* v, double step = 0.0, double step_fast = 0.0, const char* format = "%.6f", ImGuiInputTextFlags flags = 0);
+    IMGUI_API bool          InputScalar(const char* label, ImGuiDataType data_type, void* v, const void* step = NULL, const void* step_fast = NULL, const char* format = NULL, ImGuiInputTextFlags flags = 0);
+    IMGUI_API bool          InputScalarN(const char* label, ImGuiDataType data_type, void* v, int components, const void* step = NULL, const void* step_fast = NULL, const char* format = NULL, ImGuiInputTextFlags flags = 0);
 
     // Widgets: Color Editor/Picker (tip: the ColorEdit* functions have a little colored preview square that can be left-clicked to open a picker, and right-clicked to open an option menu.)
-    // Note that a 'float v[X]' function argument is the same as 'float* v', the array syntax is just a way to document the number of elements that are expected to be accessible. You can the pass the address of a first float element out of a contiguous structure, e.g. &myvector.x
+    // - Note that in C++ a 'float v[X]' function argument is the _same_ as 'float* v', the array syntax is just a way to document the number of elements that are expected to be accessible. You can the pass the address of a first float element out of a contiguous structure, e.g. &myvector.x
     IMGUI_API bool          ColorEdit3(const char* label, float col[3], ImGuiColorEditFlags flags = 0);
     IMGUI_API bool          ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flags = 0);
     IMGUI_API bool          ColorPicker3(const char* label, float col[3], ImGuiColorEditFlags flags = 0);
@@ -446,7 +462,7 @@ namespace ImGui
     IMGUI_API void          SetColorEditOptions(ImGuiColorEditFlags flags);                     // initialize current options (generally on application startup) if you want to select a default format, picker type, etc. User will be able to change many settings, unless you pass the _NoOptions flag to your calls.
 
     // Widgets: Trees
-    // TreeNode functions return true when the node is open, in which case you need to also call TreePop() when you are finished displaying the tree node contents.
+    // - TreeNode functions return true when the node is open, in which case you need to also call TreePop() when you are finished displaying the tree node contents.
     IMGUI_API bool          TreeNode(const char* label);
     IMGUI_API bool          TreeNode(const char* str_id, const char* fmt, ...) IM_FMTARGS(2);   // helper variation to completely decorelate the id from the displayed string. Read the FAQ about why and how to use ID. to align arbitrary text at the same level as a TreeNode() you can use Bullet().
     IMGUI_API bool          TreeNode(const void* ptr_id, const char* fmt, ...) IM_FMTARGS(2);   // "
@@ -467,10 +483,13 @@ namespace ImGui
     IMGUI_API bool          CollapsingHeader(const char* label, bool* p_open, ImGuiTreeNodeFlags flags = 0); // when 'p_open' isn't NULL, display an additional small close button on upper right of the header
 
     // Widgets: Selectables
+    // - A selectable highlights when hovered, and can display another color when selected. 
+    // - Neighbors selectable extend their highlight bounds in order to leave no gap between them.
     IMGUI_API bool          Selectable(const char* label, bool selected = false, ImGuiSelectableFlags flags = 0, const ImVec2& size = ImVec2(0,0));  // "bool selected" carry the selection state (read-only). Selectable() is clicked is returns true so you can modify your selection state. size.x==0.0: use remaining width, size.x>0.0: specify width. size.y==0.0: use label height, size.y>0.0: specify height
     IMGUI_API bool          Selectable(const char* label, bool* p_selected, ImGuiSelectableFlags flags = 0, const ImVec2& size = ImVec2(0,0));       // "bool* p_selected" point to the selection state (read-write), as a convenient helper.
 
     // Widgets: List Boxes
+    // - FIXME: To be consistent with all the newer API, ListBoxHeader/ListBoxFooter should in reality be called BeginListBox/EndListBox. Will rename them.
     IMGUI_API bool          ListBox(const char* label, int* current_item, const char* const items[], int items_count, int height_in_items = -1);
     IMGUI_API bool          ListBox(const char* label, int* current_item, bool (*items_getter)(void* data, int idx, const char** out_text), void* data, int items_count, int height_in_items = -1);
     IMGUI_API bool          ListBoxHeader(const char* label, const ImVec2& size = ImVec2(0,0)); // use if you want to reimplement ListBox() will custom data or interactions. if the function return true, you can output elements then call ListBoxFooter() afterwards.
@@ -483,7 +502,8 @@ namespace ImGui
     IMGUI_API void          PlotHistogram(const char* label, const float* values, int values_count, int values_offset = 0, const char* overlay_text = NULL, float scale_min = FLT_MAX, float scale_max = FLT_MAX, ImVec2 graph_size = ImVec2(0, 0), int stride = sizeof(float));
     IMGUI_API void          PlotHistogram(const char* label, float(*values_getter)(void* data, int idx), void* data, int values_count, int values_offset = 0, const char* overlay_text = NULL, float scale_min = FLT_MAX, float scale_max = FLT_MAX, ImVec2 graph_size = ImVec2(0, 0));
 
-    // Widgets: Value() Helpers. Output single value in "name: value" format (tip: freely declare more in your code to handle your types. you can add functions to the ImGui namespace)
+    // Widgets: Value() Helpers. 
+    // - Those are merely shortcut to calling Text() with a format string. Output single value in "name: value" format (tip: freely declare more in your code to handle your types. you can add functions to the ImGui namespace)
     IMGUI_API void          Value(const char* prefix, bool b);
     IMGUI_API void          Value(const char* prefix, int v);
     IMGUI_API void          Value(const char* prefix, unsigned int v);
@@ -505,7 +525,14 @@ namespace ImGui
     IMGUI_API void          SetTooltip(const char* fmt, ...) IM_FMTARGS(1);                     // set a text-only tooltip, typically use with ImGui::IsItemHovered(). overidde any previous call to SetTooltip().
     IMGUI_API void          SetTooltipV(const char* fmt, va_list args) IM_FMTLIST(1);
 
-    // Popups
+    // Popups, Modals
+    // The properties of popups windows are:
+    // - They block normal mouse hovering detection outside them. (*)
+    // - Unless modal, they can be closed by clicking anywhere outside them, or by pressing ESCAPE.
+    // - Their visibility state (~bool) is held internally by imgui instead of being held by the programmer as we are used to with regular Begin() calls.
+    //   User can manipulate the visibility state by calling OpenPopup().
+    // (*) One can use IsItemHovered(ImGuiHoveredFlags_AllowWhenBlockedByPopup) to bypass it and detect hovering even when normally blocked by a popup.
+    // Those three properties are connected. The library needs to hold their visibility state because it can close popups at any time.
     IMGUI_API void          OpenPopup(const char* str_id);                                      // call to mark popup as open (don't call every frame!). popups are closed when user click outside, or if CloseCurrentPopup() is called within a BeginPopup()/EndPopup() block. By default, Selectable()/MenuItem() are calling CloseCurrentPopup(). Popup identifiers are relative to the current ID-stack (so OpenPopup and BeginPopup needs to be at the same level).
     IMGUI_API bool          BeginPopup(const char* str_id, ImGuiWindowFlags flags = 0);                                             // return true if the popup is open, and you can start outputting to it. only call EndPopup() if BeginPopup() returns true!
     IMGUI_API bool          BeginPopupContextItem(const char* str_id = NULL, int mouse_button = 1);                                 // helper to open and begin popup when clicked on last item. if you can pass a NULL str_id only if the previous item had an id. If you want to use that on a non-interactive item such as Text() you need to pass in an explicit ID here. read comments in .cpp!
@@ -514,11 +541,12 @@ namespace ImGui
     IMGUI_API bool          BeginPopupModal(const char* name, bool* p_open = NULL, ImGuiWindowFlags flags = 0);                     // modal dialog (regular window with title bar, block interactions behind the modal window, can't close the modal window by clicking outside)
     IMGUI_API void          EndPopup();                                                                                             // only call EndPopup() if BeginPopupXXX() returns true!
     IMGUI_API bool          OpenPopupOnItemClick(const char* str_id = NULL, int mouse_button = 1);                                  // helper to open popup when clicked on last item (note: actually triggers on the mouse _released_ event to be consistent with popup behaviors). return true when just opened.
-    IMGUI_API bool          IsPopupOpen(const char* str_id);                                    // return true if the popup is open
+    IMGUI_API bool          IsPopupOpen(const char* str_id);                                    // return true if the popup is open at the current begin-ed level of the popup stack.
     IMGUI_API void          CloseCurrentPopup();                                                // close the popup we have begin-ed into. clicking on a MenuItem or Selectable automatically close the current popup.
 
     // Columns
-    // You can also use SameLine(pos_x) for simplified columns. The columns API is work-in-progress and rather lacking (columns are arguably the worst part of dear imgui at the moment!)
+    // - You can also use SameLine(pos_x) to mimic simplified columns.
+    // - The columns API is work-in-progress and rather lacking (columns are arguably the worst part of dear imgui at the moment!)
     IMGUI_API void          Columns(int count = 1, const char* id = NULL, bool border = true);
     IMGUI_API void          NextColumn();                                                       // next column, defaults to current row or next row if the current row is finished
     IMGUI_API int           GetColumnIndex();                                                   // get current column index
@@ -528,8 +556,17 @@ namespace ImGui
     IMGUI_API void          SetColumnOffset(int column_index, float offset_x);                  // set position of column line (in pixels, from the left side of the contents region). pass -1 to use current column
     IMGUI_API int           GetColumnsCount();
 
-    // Logging/Capture: all text output from interface is captured to tty/file/clipboard. By default, tree nodes are automatically opened during logging.
-    IMGUI_API void          LogToTTY(int max_depth = -1);                                       // start logging to tty
+    // Tab Bars, Tabs
+    // [BETA API] API may evolve!
+    IMGUI_API bool          BeginTabBar(const char* str_id, ImGuiTabBarFlags flags = 0);        // create and append into a TabBar
+    IMGUI_API void          EndTabBar();                                                        // only call EndTabBar() if BeginTabBar() returns true!
+    IMGUI_API bool          BeginTabItem(const char* label, bool* p_open = NULL, ImGuiTabItemFlags flags = 0);// create a Tab. Returns true if the Tab is selected.
+    IMGUI_API void          EndTabItem();                                                       // only call EndTabItem() if BeginTabItem() returns true!
+    IMGUI_API void          SetTabItemClosed(const char* tab_or_docked_window_label);           // notify TabBar or Docking system of a closed tab/window ahead (useful to reduce visual flicker on reorderable tab bars). For tab-bar: call after BeginTabBar() and before Tab submissions. Otherwise call with a window name.
+
+    // Logging/Capture
+    // - All text output from the interface can be captured into tty/file/clipboard. By default, tree nodes are automatically opened during logging.
+    IMGUI_API void          LogToTTY(int max_depth = -1);                                       // start logging to tty (stdout)
     IMGUI_API void          LogToFile(int max_depth = -1, const char* filename = NULL);         // start logging to file
     IMGUI_API void          LogToClipboard(int max_depth = -1);                                 // start logging to OS clipboard
     IMGUI_API void          LogFinish();                                                        // stop logging (close file, etc.)
@@ -537,7 +574,7 @@ namespace ImGui
     IMGUI_API void          LogText(const char* fmt, ...) IM_FMTARGS(1);                        // pass text data straight to log (without being displayed)
 
     // Drag and Drop
-    // [BETA API] Missing Demo code. API may evolve.
+    // [BETA API] API may evolve!
     IMGUI_API bool          BeginDragDropSource(ImGuiDragDropFlags flags = 0);                                      // call when the current item is active. If this return true, you can call SetDragDropPayload() + EndDragDropSource()
     IMGUI_API bool          SetDragDropPayload(const char* type, const void* data, size_t size, ImGuiCond cond = 0);// type is a user defined string of maximum 32 characters. Strings starting with '_' are reserved for dear imgui internal types. Data is copied and held by imgui.
     IMGUI_API void          EndDragDropSource();                                                                    // only call EndDragDropSource() if BeginDragDropSource() returns true!
@@ -551,12 +588,13 @@ namespace ImGui
     IMGUI_API void          PopClipRect();
 
     // Focus, Activation
-    // (Prefer using "SetItemDefaultFocus()" over "if (IsWindowAppearing()) SetScrollHereY()" when applicable to signify "this is the default item")
+    // - Prefer using "SetItemDefaultFocus()" over "if (IsWindowAppearing()) SetScrollHereY()" when applicable to signify "this is the default item"
     IMGUI_API void          SetItemDefaultFocus();                                              // make last item the default focused item of a window.
     IMGUI_API void          SetKeyboardFocusHere(int offset = 0);                               // focus keyboard on the next widget. Use positive 'offset' to access sub components of a multiple component widget. Use -1 to access previous widget.
 
     // Item/Widgets Utilities
-    // See Demo Window under "Widgets->Querying Status" for an interactive visualization of many of those functions.
+    // - Most of the functions are referring to the last/previous item we submitted.
+    // - See Demo Window under "Widgets->Querying Status" for an interactive visualization of most of those functions.
     IMGUI_API bool          IsItemHovered(ImGuiHoveredFlags flags = 0);                         // is the last item hovered? (and usable, aka not blocked by a popup, etc.). See ImGuiHoveredFlags for more options.
     IMGUI_API bool          IsItemActive();                                                     // is the last item active? (e.g. button being held, text field being edited. This will continuously return true while holding mouse button on an item. Items that don't interact will always return false)
     IMGUI_API bool          IsItemFocused();                                                    // is the last item focused for keyboard/gamepad navigation?
@@ -568,16 +606,16 @@ namespace ImGui
     IMGUI_API bool          IsAnyItemHovered();
     IMGUI_API bool          IsAnyItemActive();
     IMGUI_API bool          IsAnyItemFocused();
-    IMGUI_API ImVec2        GetItemRectMin();                                                   // get bounding rectangle of last item, in screen space
-    IMGUI_API ImVec2        GetItemRectMax();                                                   // "
-    IMGUI_API ImVec2        GetItemRectSize();                                                  // get size of last item, in screen space
+    IMGUI_API ImVec2        GetItemRectMin();                                                   // get upper-left bounding rectangle of the last item (screen space)
+    IMGUI_API ImVec2        GetItemRectMax();                                                   // get lower-right bounding rectangle of the last item (screen space)
+    IMGUI_API ImVec2        GetItemRectSize();                                                  // get size of last item
     IMGUI_API void          SetItemAllowOverlap();                                              // allow last item to be overlapped by a subsequent item. sometimes useful with invisible buttons, selectables, etc. to catch unused area.
 
     // Miscellaneous Utilities
     IMGUI_API bool          IsRectVisible(const ImVec2& size);                                  // test if rectangle (of given size, starting from cursor position) is visible / not clipped.
     IMGUI_API bool          IsRectVisible(const ImVec2& rect_min, const ImVec2& rect_max);      // test if rectangle (in screen space) is visible / not clipped. to perform coarse clipping on user's side.
-    IMGUI_API double        GetTime();
-    IMGUI_API int           GetFrameCount();
+    IMGUI_API double        GetTime();                                                          // get global imgui time. incremented by io.DeltaTime every frame.
+    IMGUI_API int           GetFrameCount();                                                    // get global imgui frame count. incremented by 1 every frame.
     IMGUI_API ImDrawList*   GetOverlayDrawList();                                               // this draw list will be the last rendered one, useful to quickly draw overlays shapes/text
     IMGUI_API ImDrawListSharedData* GetDrawListSharedData();                                    // you may use this when creating your own ImDrawList instances
     IMGUI_API const char*   GetStyleColorName(ImGuiCol idx);
@@ -610,28 +648,28 @@ namespace ImGui
     IMGUI_API bool          IsMousePosValid(const ImVec2* mouse_pos = NULL);                    //
     IMGUI_API ImVec2        GetMousePos();                                                      // shortcut to ImGui::GetIO().MousePos provided by user, to be consistent with other calls
     IMGUI_API ImVec2        GetMousePosOnOpeningCurrentPopup();                                 // retrieve backup of mouse position at the time of opening popup we have BeginPopup() into
-    IMGUI_API ImVec2        GetMouseDragDelta(int button = 0, float lock_threshold = -1.0f);    // dragging amount since clicking. if lock_threshold < -1.0f uses io.MouseDraggingThreshold
+    IMGUI_API ImVec2        GetMouseDragDelta(int button = 0, float lock_threshold = -1.0f);    // return the delta from the initial clicking position. This is locked and return 0.0f until the mouse moves past a distance threshold at least once. If lock_threshold < -1.0f uses io.MouseDraggingThreshold
     IMGUI_API void          ResetMouseDragDelta(int button = 0);                                //
     IMGUI_API ImGuiMouseCursor GetMouseCursor();                                                // get desired cursor type, reset in ImGui::NewFrame(), this is updated during the frame. valid before Render(). If you use software rendering by setting io.MouseDrawCursor ImGui will render those for you
     IMGUI_API void          SetMouseCursor(ImGuiMouseCursor type);                              // set desired cursor type
-    IMGUI_API void          CaptureKeyboardFromApp(bool capture = true);                        // manually override io.WantCaptureKeyboard flag next frame (said flag is entirely left for your application to handle). e.g. force capture keyboard when your widget is being hovered.
-    IMGUI_API void          CaptureMouseFromApp(bool capture = true);                           // manually override io.WantCaptureMouse flag next frame (said flag is entirely left for your application to handle).
+    IMGUI_API void          CaptureKeyboardFromApp(bool want_capture_keyboard_value = true);    // attention: misleading name! manually override io.WantCaptureKeyboard flag next frame (said flag is entirely left for your application to handle). e.g. force capture keyboard when your widget is being hovered. This is equivalent to setting "io.WantCaptureKeyboard = want_capture_keyboard_value"; after the next NewFrame() call. 
+    IMGUI_API void          CaptureMouseFromApp(bool want_capture_mouse_value = true);          // attention: misleading name! manually override io.WantCaptureMouse flag next frame (said flag is entirely left for your application to handle). This is equivalent to setting "io.WantCaptureMouse = want_capture_mouse_value;" after the next NewFrame() call. 
 
     // Clipboard Utilities (also see the LogToClipboard() function to capture or output text data to the clipboard)
     IMGUI_API const char*   GetClipboardText();
     IMGUI_API void          SetClipboardText(const char* text);
 
     // Settings/.Ini Utilities
-    // The disk functions are automatically called if io.IniFilename != NULL (default is "imgui.ini").
-    // Set io.IniFilename to NULL to load/save manually. Read io.WantSaveIniSettings description about handling .ini saving manually.
+    // - The disk functions are automatically called if io.IniFilename != NULL (default is "imgui.ini").
+    // - Set io.IniFilename to NULL to load/save manually. Read io.WantSaveIniSettings description about handling .ini saving manually.
     IMGUI_API void          LoadIniSettingsFromDisk(const char* ini_filename);                  // call after CreateContext() and before the first call to NewFrame(). NewFrame() automatically calls LoadIniSettingsFromDisk(io.IniFilename).
     IMGUI_API void          LoadIniSettingsFromMemory(const char* ini_data, size_t ini_size=0); // call after CreateContext() and before the first call to NewFrame() to provide .ini data from your own data source.
     IMGUI_API void          SaveIniSettingsToDisk(const char* ini_filename);
     IMGUI_API const char*   SaveIniSettingsToMemory(size_t* out_ini_size = NULL);               // return a zero-terminated string with the .ini data which you can save by your own mean. call when io.WantSaveIniSettings is set, then save data by your own mean and clear io.WantSaveIniSettings.
 
     // Memory Utilities
-    // All those functions are not reliant on the current context.
-    // If you reload the contents of imgui.cpp at runtime, you may need to call SetCurrentContext() + SetAllocatorFunctions() again.
+    // - All those functions are not reliant on the current context.
+    // - If you reload the contents of imgui.cpp at runtime, you may need to call SetCurrentContext() + SetAllocatorFunctions() again.
     IMGUI_API void          SetAllocatorFunctions(void* (*alloc_func)(size_t sz, void* user_data), void(*free_func)(void* ptr, void* user_data), void* user_data = NULL);
     IMGUI_API void*         MemAlloc(size_t size);
     IMGUI_API void          MemFree(void* ptr);
@@ -665,6 +703,7 @@ enum ImGuiWindowFlags_
     ImGuiWindowFlags_AlwaysUseWindowPadding = 1 << 16,  // Ensure child windows without border uses style.WindowPadding (ignored by default for non-bordered child windows, because more convenient)
     ImGuiWindowFlags_NoNavInputs            = 1 << 18,  // No gamepad/keyboard navigation within the window
     ImGuiWindowFlags_NoNavFocus             = 1 << 19,  // No focusing toward this window with gamepad/keyboard navigation (e.g. skipped by CTRL+TAB)
+    ImGuiWindowFlags_UnsavedDocument        = 1 << 20,  // Append '*' to title without affecting the ID, as a convenience to avoid using the ### operator. When used in a tab/docking context, tab is selected on closure and closure is deferred by one frame to allow code to cancel the closure (with a confirmation popup, etc.) without flicker.
     ImGuiWindowFlags_NoNav                  = ImGuiWindowFlags_NoNavInputs | ImGuiWindowFlags_NoNavFocus,
     ImGuiWindowFlags_NoDecoration           = ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoCollapse,
     ImGuiWindowFlags_NoInputs               = ImGuiWindowFlags_NoMouseInputs | ImGuiWindowFlags_NoNavInputs | ImGuiWindowFlags_NoNavFocus,
@@ -679,7 +718,7 @@ enum ImGuiWindowFlags_
 
     // [Obsolete]
     //ImGuiWindowFlags_ShowBorders          = 1 << 7,   // --> Set style.FrameBorderSize=1.0f / style.WindowBorderSize=1.0f to enable borders around windows and items
-    //ImGuiWindowFlags_ResizeFromAnySide    = 1 << 17,  // --> Set io.ConfigResizeWindowsFromEdges and make sure mouse cursors are supported by back-end (io.BackendFlags & ImGuiBackendFlags_HasMouseCursors)
+    //ImGuiWindowFlags_ResizeFromAnySide    = 1 << 17,  // --> Set io.ConfigWindowsResizeFromEdges and make sure mouse cursors are supported by back-end (io.BackendFlags & ImGuiBackendFlags_HasMouseCursors)
 };
 
 // Flags for ImGui::InputText()
@@ -759,6 +798,32 @@ enum ImGuiComboFlags_
     ImGuiComboFlags_HeightMask_             = ImGuiComboFlags_HeightSmall | ImGuiComboFlags_HeightRegular | ImGuiComboFlags_HeightLarge | ImGuiComboFlags_HeightLargest
 };
 
+// Flags for ImGui::BeginTabBar()
+enum ImGuiTabBarFlags_
+{
+    ImGuiTabBarFlags_None                           = 0,
+    ImGuiTabBarFlags_Reorderable                    = 1 << 0,   // Allow manually dragging tabs to re-order them + New tabs are appended at the end of list
+    ImGuiTabBarFlags_AutoSelectNewTabs              = 1 << 1,   // Automatically select new tabs when they appear
+    ImGuiTabBarFlags_NoCloseWithMiddleMouseButton   = 1 << 2,   // Disable behavior of closing tabs (that are submitted with p_open != NULL) with middle mouse button. You can still repro this behavior on user's side with if (IsItemHovered() && IsMouseClicked(2)) *p_open = false.
+    ImGuiTabBarFlags_NoTabListPopupButton           = 1 << 3,
+    ImGuiTabBarFlags_NoTabListScrollingButtons      = 1 << 4,
+    ImGuiTabBarFlags_NoTooltip                      = 1 << 5,   // Disable tooltips when hovering a tab
+    ImGuiTabBarFlags_FittingPolicyResizeDown        = 1 << 6,   // Resize tabs when they don't fit
+    ImGuiTabBarFlags_FittingPolicyScroll            = 1 << 7,   // Add scroll buttons when tabs don't fit
+    ImGuiTabBarFlags_FittingPolicyMask_             = ImGuiTabBarFlags_FittingPolicyResizeDown | ImGuiTabBarFlags_FittingPolicyScroll,
+    ImGuiTabBarFlags_FittingPolicyDefault_          = ImGuiTabBarFlags_FittingPolicyResizeDown
+};  
+
+// Flags for ImGui::BeginTabItem()
+enum ImGuiTabItemFlags_
+{
+    ImGuiTabItemFlags_None                          = 0,
+    ImGuiTabItemFlags_UnsavedDocument               = 1 << 0,   // Append '*' to title without affecting the ID, as a convenience to avoid using the ### operator. Also: tab is selected on closure and closure is deferred by one frame to allow code to undo it without flicker.
+    ImGuiTabItemFlags_SetSelected                   = 1 << 1,   // Trigger flag to programatically make the tab selected when calling BeginTabItem()
+    ImGuiTabItemFlags_NoCloseWithMiddleMouseButton  = 1 << 2,   // Disable behavior of closing tabs (that are submitted with p_open != NULL) with middle mouse button. You can still repro this behavior on user's side with if (IsItemHovered() && IsMouseClicked(2)) *p_open = false.
+    ImGuiTabItemFlags_NoPushId                      = 1 << 3    // Don't call PushID(tab->ID)/PopID() on BeginTabItem()/EndTabItem()
+};
+
 // Flags for ImGui::IsWindowFocused()
 enum ImGuiFocusedFlags_
 {
@@ -955,6 +1020,11 @@ enum ImGuiCol_
     ImGuiCol_ResizeGrip,
     ImGuiCol_ResizeGripHovered,
     ImGuiCol_ResizeGripActive,
+    ImGuiCol_Tab,
+    ImGuiCol_TabHovered,
+    ImGuiCol_TabActive,
+    ImGuiCol_TabUnfocused,
+    ImGuiCol_TabUnfocusedActive,
     ImGuiCol_PlotLines,
     ImGuiCol_PlotLinesHovered,
     ImGuiCol_PlotHistogram,
@@ -969,8 +1039,9 @@ enum ImGuiCol_
 
     // Obsolete names (will be removed)
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
-    , ImGuiCol_ChildWindowBg = ImGuiCol_ChildBg, ImGuiCol_Column = ImGuiCol_Separator, ImGuiCol_ColumnHovered = ImGuiCol_SeparatorHovered, ImGuiCol_ColumnActive = ImGuiCol_SeparatorActive
-    , ImGuiCol_ModalWindowDarkening = ImGuiCol_ModalWindowDimBg
+    , ImGuiCol_ModalWindowDarkening = ImGuiCol_ModalWindowDimBg                      // [renamed in 1.63]
+    , ImGuiCol_ChildWindowBg = ImGuiCol_ChildBg                                      // [renamed in 1.53]
+    , ImGuiCol_Column = ImGuiCol_Separator, ImGuiCol_ColumnHovered = ImGuiCol_SeparatorHovered, ImGuiCol_ColumnActive = ImGuiCol_SeparatorActive  // [renamed in 1.51]
     //ImGuiCol_CloseButton, ImGuiCol_CloseButtonActive, ImGuiCol_CloseButtonHovered, // [unused since 1.60+] the close button now uses regular button colors.
     //ImGuiCol_ComboBg,                                                              // [unused since 1.53+] ComboBg has been merged with PopupBg, so a redirect isn't accurate.
 #endif
@@ -1002,6 +1073,7 @@ enum ImGuiStyleVar_
     ImGuiStyleVar_ScrollbarRounding,   // float     ScrollbarRounding
     ImGuiStyleVar_GrabMinSize,         // float     GrabMinSize
     ImGuiStyleVar_GrabRounding,        // float     GrabRounding
+    ImGuiStyleVar_TabRounding,         // float     TabRounding
     ImGuiStyleVar_ButtonTextAlign,     // ImVec2    ButtonTextAlign
     ImGuiStyleVar_COUNT
 
@@ -1082,6 +1154,68 @@ enum ImGuiCond_
 #endif
 };
 
+//-----------------------------------------------------------------------------
+// Helper: ImVector<>
+// Lightweight std::vector<>-like class to avoid dragging dependencies (also, some implementations of STL with debug enabled are absurdly slow, we bypass it so our code runs fast in debug).
+// You generally do NOT need to care or use this ever. But we need to make it available in imgui.h because some of our data structures are relying on it.
+// Important: clear() frees memory, resize(0) keep the allocated buffer. We use resize(0) a lot to intentionally recycle allocated buffers across frames and amortize our costs.
+// Important: our implementation does NOT call C++ constructors/destructors, we treat everything as raw data! This is intentional but be extra mindful of that, 
+// do NOT use this class as a std::vector replacement in your own code! Many of the structures used by dear imgui can be safely initialized by a zero-memset.
+//-----------------------------------------------------------------------------
+
+template<typename T>
+struct ImVector
+{
+    int                 Size;
+    int                 Capacity;
+    T*                  Data;
+
+    // Provide standard typedefs but we don't use them ourselves.
+    typedef T                   value_type;
+    typedef value_type*         iterator;
+    typedef const value_type*   const_iterator;
+
+    // Constructors, destructor
+    inline ImVector()                                       { Size = Capacity = 0; Data = NULL; }
+    inline ImVector(const ImVector<T>& src)                 { Size = Capacity = 0; Data = NULL; operator=(src); }
+    inline ImVector<T>& operator=(const ImVector<T>& src)   { clear(); resize(src.Size); memcpy(Data, src.Data, (size_t)Size * sizeof(T)); return *this; }
+    inline ~ImVector()                                      { if (Data) ImGui::MemFree(Data); }
+
+    inline bool         empty() const                       { return Size == 0; }
+    inline int          size() const                        { return Size; }
+    inline int          size_in_bytes() const               { return Size * (int)sizeof(T); }
+    inline int          capacity() const                    { return Capacity; }
+    inline T&           operator[](int i)                   { IM_ASSERT(i < Size); return Data[i]; }
+    inline const T&     operator[](int i) const             { IM_ASSERT(i < Size); return Data[i]; }
+
+    inline void         clear()                             { if (Data) { Size = Capacity = 0; ImGui::MemFree(Data); Data = NULL; } }
+    inline T*           begin()                             { return Data; }
+    inline const T*     begin() const                       { return Data; }
+    inline T*           end()                               { return Data + Size; }
+    inline const T*     end() const                         { return Data + Size; }
+    inline T&           front()                             { IM_ASSERT(Size > 0); return Data[0]; }
+    inline const T&     front() const                       { IM_ASSERT(Size > 0); return Data[0]; }
+    inline T&           back()                              { IM_ASSERT(Size > 0); return Data[Size - 1]; }
+    inline const T&     back() const                        { IM_ASSERT(Size > 0); return Data[Size - 1]; }
+    inline void         swap(ImVector<T>& rhs)              { int rhs_size = rhs.Size; rhs.Size = Size; Size = rhs_size; int rhs_cap = rhs.Capacity; rhs.Capacity = Capacity; Capacity = rhs_cap; T* rhs_data = rhs.Data; rhs.Data = Data; Data = rhs_data; }
+
+    inline int          _grow_capacity(int sz) const        { int new_capacity = Capacity ? (Capacity + Capacity/2) : 8; return new_capacity > sz ? new_capacity : sz; }
+    inline void         resize(int new_size)                { if (new_size > Capacity) reserve(_grow_capacity(new_size)); Size = new_size; }
+    inline void         resize(int new_size, const T& v)    { if (new_size > Capacity) reserve(_grow_capacity(new_size)); if (new_size > Size) for (int n = Size; n < new_size; n++) memcpy(&Data[n], &v, sizeof(v)); Size = new_size; }
+    inline void         reserve(int new_capacity)           { if (new_capacity <= Capacity) return; T* new_data = (T*)ImGui::MemAlloc((size_t)new_capacity * sizeof(T)); if (Data) { memcpy(new_data, Data, (size_t)Size * sizeof(T)); ImGui::MemFree(Data); } Data = new_data; Capacity = new_capacity; }
+
+    // NB: It is illegal to call push_back/push_front/insert with a reference pointing inside the ImVector data itself! e.g. v.push_back(v[10]) is forbidden.
+    inline void         push_back(const T& v)               { if (Size == Capacity) reserve(_grow_capacity(Size + 1)); memcpy(&Data[Size], &v, sizeof(v)); Size++; }
+    inline void         pop_back()                          { IM_ASSERT(Size > 0); Size--; }
+    inline void         push_front(const T& v)              { if (Size == 0) push_back(v); else insert(Data, v); }
+    inline T*           erase(const T* it)                  { IM_ASSERT(it >= Data && it < Data+Size); const ptrdiff_t off = it - Data; memmove(Data + off, Data + off + 1, ((size_t)Size - (size_t)off - 1) * sizeof(T)); Size--; return Data + off; }
+    inline T*           erase(const T* it, const T* it_last){ IM_ASSERT(it >= Data && it < Data+Size && it_last > it && it_last <= Data+Size); const ptrdiff_t count = it_last - it; const ptrdiff_t off = it - Data; memmove(Data + off, Data + off + count, ((size_t)Size - (size_t)off - count) * sizeof(T)); Size -= (int)count; return Data + off; }
+    inline T*           erase_unsorted(const T* it)         { IM_ASSERT(it >= Data && it < Data+Size);  const ptrdiff_t off = it - Data; if (it < Data+Size-1) memcpy(Data + off, Data + Size - 1, sizeof(T)); Size--; return Data + off; }
+    inline T*           insert(const T* it, const T& v)     { IM_ASSERT(it >= Data && it <= Data+Size); const ptrdiff_t off = it - Data; if (Size == Capacity) reserve(_grow_capacity(Size + 1)); if (off < (int)Size) memmove(Data + off + 1, Data + off, ((size_t)Size - (size_t)off) * sizeof(T)); memcpy(&Data[off], &v, sizeof(v)); Size++; return Data + off; }
+    inline bool         contains(const T& v) const          { const T* data = Data;  const T* data_end = Data + Size; while (data < data_end) if (*data++ == v) return true; return false; }
+    inline int          index_from_ptr(const T* it) const   { IM_ASSERT(it >= Data && it <= Data+Size); const ptrdiff_t off = it - Data; return (int)off; }
+};
+
 //-----------------------------------------------------------------------------
 // ImGuiStyle
 // You may modify the ImGui::GetStyle() main instance during initialization and before NewFrame().
@@ -1113,6 +1247,8 @@ struct ImGuiStyle
     float       ScrollbarRounding;          // Radius of grab corners for scrollbar.
     float       GrabMinSize;                // Minimum width/height of a grab box for slider/scrollbar.
     float       GrabRounding;               // Radius of grabs corners rounding. Set to 0.0f to have rectangular slider grabs.
+    float       TabRounding;                // Radius of upper corners of a tab. Set to 0.0f to have rectangular tabs.
+    float       TabBorderSize;              // Thickness of border around tabs. 
     ImVec2      ButtonTextAlign;            // Alignment of button text when button is larger than text. Defaults to (0.5f,0.5f) for horizontally+vertically centered.
     ImVec2      DisplayWindowPadding;       // Window position are clamped to be visible within the display area by at least this amount. Only applies to regular windows.
     ImVec2      DisplaySafeAreaPadding;     // If you cannot see the edges of your screen (e.g. on a TV) increase the safe area padding. Apply to popups/tooltips as well regular windows. NB: Prefer configuring your TV sets correctly!
@@ -1135,7 +1271,7 @@ struct ImGuiStyle
 struct ImGuiIO
 {
     //------------------------------------------------------------------
-    // Configuration (fill once)            // Default value:
+    // Configuration (fill once)                // Default value
     //------------------------------------------------------------------
 
     ImGuiConfigFlags   ConfigFlags;             // = 0              // See ImGuiConfigFlags_ enum. Set by user/application. Gamepad/keyboard navigation options, etc.
@@ -1153,28 +1289,32 @@ struct ImGuiIO
     float       KeyRepeatRate;                  // = 0.050f         // When holding a key/button, rate at which it repeats, in seconds.
     void*       UserData;                       // = NULL           // Store your own data for retrieval by callbacks.
 
-    ImFontAtlas*  Fonts;                    // <auto>               // Load and assemble one or more fonts into a single tightly packed texture. Output to Fonts array.
+    ImFontAtlas*Fonts;                          // <auto>           // Load, rasterize and pack one or more fonts into a single texture.
     float       FontGlobalScale;                // = 1.0f           // Global scale all fonts
     bool        FontAllowUserScaling;           // = false          // Allow user scaling text of individual window with CTRL+Wheel.
     ImFont*     FontDefault;                    // = NULL           // Font to use on NewFrame(). Use NULL to uses Fonts->Fonts[0].
     ImVec2      DisplayFramebufferScale;        // = (1.0f,1.0f)    // For retina display or other situations where window coordinates are different from framebuffer coordinates. User storage only, presently not used by ImGui.
-    ImVec2        DisplayVisibleMin;        // <unset> (0.0f,0.0f)  // [OBSOLETE] If you use DisplaySize as a virtual space larger than your screen, set DisplayVisibleMin/Max to the visible area.
-    ImVec2        DisplayVisibleMax;        // <unset> (0.0f,0.0f)  // [OBSOLETE: just use io.DisplaySize!] If the values are the same, we defaults to Min=(0.0f) and Max=DisplaySize
+    ImVec2      DisplayVisibleMin;              // <unset>          // [OBSOLETE] If you use DisplaySize as a virtual space larger than your screen, set DisplayVisibleMin/Max to the visible area.
+    ImVec2      DisplayVisibleMax;              // <unset>          // [OBSOLETE] Just use io.DisplaySize! If the values are the same, we defaults to Min=(0.0f) and Max=DisplaySize
 
     // Miscellaneous configuration options
     bool        MouseDrawCursor;                // = false          // Request ImGui to draw a mouse cursor for you (if you are on a platform without a mouse cursor). Cannot be easily renamed to 'io.ConfigXXX' because this is frequently used by back-end implementations.
     bool        ConfigMacOSXBehaviors;          // = defined(__APPLE__) // OS X style: Text editing cursor movement using Alt instead of Ctrl, Shortcuts using Cmd/Super instead of Ctrl, Line/Text Start and End using Cmd+Arrows instead of Home/End, Double click selects by word instead of selecting whole text, Multi-selection in lists uses Cmd/Super instead of Ctrl (was called io.OptMacOSXBehaviors prior to 1.63)
     bool        ConfigInputTextCursorBlink;     // = true           // Set to false to disable blinking cursor, for users who consider it distracting. (was called: io.OptCursorBlink prior to 1.63)
-    bool          ConfigResizeWindowsFromEdges; // = false          // [BETA] Enable resizing of windows from their edges and from the lower-left corner. This requires (io.BackendFlags & ImGuiBackendFlags_HasMouseCursors) because it needs mouse cursor feedback. (This used to be the ImGuiWindowFlags_ResizeFromAnySide flag)
+    bool        ConfigWindowsResizeFromEdges;   // = true           // Enable resizing of windows from their edges and from the lower-left corner. This requires (io.BackendFlags & ImGuiBackendFlags_HasMouseCursors) because it needs mouse cursor feedback. (This used to be the a per-window ImGuiWindowFlags_ResizeFromAnySide flag)
+    bool        ConfigWindowsMoveFromTitleBarOnly;// = false        // [BETA] Set to true to only allow moving windows when clicked+dragged from the title bar. Windows without a title bar are not affected.
 
     //------------------------------------------------------------------
     // Platform Functions
     // (the imgui_impl_xxxx back-end files are setting those up for you)
     //------------------------------------------------------------------
 
-    // Optional: Platform/Renderer back-end name (informational only! will be displayed in About Window)
-    const char* BackendPlatformName;
-    const char* BackendRendererName;
+    // Optional: Platform/Renderer back-end name (informational only! will be displayed in About Window) + User data for back-end/wrappers to store their own stuff.
+    const char* BackendPlatformName;            // = NULL
+    const char* BackendRendererName;            // = NULL
+    void*       BackendPlatformUserData;        // = NULL
+    void*       BackendRendererUserData;        // = NULL
+    void*       BackendLanguageUserData;        // = NULL
 
     // Optional: Access OS clipboard
     // (default to use native Win32 clipboard on Windows, otherwise uses a private clipboard. Override to access OS clipboard on other architectures)
@@ -1185,14 +1325,14 @@ struct ImGuiIO
     // Optional: Notify OS Input Method Editor of the screen position of your cursor for text input position (e.g. when using Japanese/Chinese IME on Windows)
     // (default to use native imm32 api on Windows)
     void        (*ImeSetInputScreenPosFn)(int x, int y);
-    void*       ImeWindowHandle;                // (Windows) Set this to your HWND to get automatic IME cursor positioning.
+    void*       ImeWindowHandle;                // = NULL           // (Windows) Set this to your HWND to get automatic IME cursor positioning.
 
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
     // [OBSOLETE since 1.60+] Rendering function, will be automatically called in Render(). Please call your rendering function yourself now!
     // You can obtain the ImDrawData* by calling ImGui::GetDrawData() after Render(). See example applications if you are unsure of how to implement this.
     void        (*RenderDrawListsFn)(ImDrawData* data);
 #else
-    // This is only here to keep ImGuiIO the same size, so that IMGUI_DISABLE_OBSOLETE_FUNCTIONS can exceptionally be used outside of imconfig.h.
+    // This is only here to keep ImGuiIO the same size/layout, so that IMGUI_DISABLE_OBSOLETE_FUNCTIONS can exceptionally be used outside of imconfig.h.
     void*       RenderDrawListsFnUnused;
 #endif
 
@@ -1209,13 +1349,12 @@ struct ImGuiIO
     bool        KeyAlt;                         // Keyboard modifier pressed: Alt
     bool        KeySuper;                       // Keyboard modifier pressed: Cmd/Super/Windows
     bool        KeysDown[512];                  // Keyboard keys that are pressed (ideally left in the "native" order your engine has access to keyboard keys, so you can use your own defines/enums for keys).
-    ImWchar     InputCharacters[16+1];          // List of characters input (translated by user from keypress+keyboard state). Fill using AddInputCharacter() helper.
-    float       NavInputs[ImGuiNavInput_COUNT]; // Gamepad inputs (keyboard keys will be auto-mapped and be written here by ImGui::NewFrame, all values will be cleared back to zero in ImGui::EndFrame)
+    float       NavInputs[ImGuiNavInput_COUNT]; // Gamepad inputs. Cleared back to zero by EndFrame(). Keyboard keys will be auto-mapped and be written here by NewFrame().
 
     // Functions
-    IMGUI_API void AddInputCharacter(ImWchar c);                        // Add new character into InputCharacters[]
-    IMGUI_API void AddInputCharactersUTF8(const char* utf8_chars);      // Add new characters into InputCharacters[] from an UTF-8 string
-    inline void    ClearInputCharacters() { InputCharacters[0] = 0; }   // Clear the text input buffer manually
+    IMGUI_API void  AddInputCharacter(ImWchar c);               // Queue new character input 
+    IMGUI_API void  AddInputCharactersUTF8(const char* str);    // Queue new characters input from an UTF-8 string
+    IMGUI_API void  ClearInputCharacters();                     // Clear the text input buffer manually
 
     //------------------------------------------------------------------
     // Output - Retrieve after calling NewFrame()
@@ -1255,6 +1394,7 @@ struct ImGuiIO
     float       KeysDownDurationPrev[512];      // Previous duration the key has been down
     float       NavInputsDownDuration[ImGuiNavInput_COUNT];
     float       NavInputsDownDurationPrev[ImGuiNavInput_COUNT];
+    ImVector<ImWchar> InputQueueCharacters;     // Queue of _characters_ input (obtained by platform back-end). Fill using AddInputCharacter() helper.
 
     IMGUI_API   ImGuiIO();
 };
@@ -1332,6 +1472,7 @@ struct ImGuiPayload
 
 //-----------------------------------------------------------------------------
 // Obsolete functions (Will be removed! Read 'API BREAKING CHANGES' section in imgui.cpp for details)
+// Please keep your copy of dear imgui up to date! Occasionally set '#define IMGUI_DISABLE_OBSOLETE_FUNCTIONS' in imconfig.h to stay ahead.
 //-----------------------------------------------------------------------------
 
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
@@ -1339,14 +1480,14 @@ namespace ImGui
 {
     // OBSOLETED in 1.66 (from Sep 2018)
     static inline void  SetScrollHere(float center_ratio=0.5f){ SetScrollHereY(center_ratio); }
-    // OBSOLETED in 1.63 (from Aug 2018)
+    // OBSOLETED in 1.63 (between Aug 2018 and Sept 2018)
     static inline bool  IsItemDeactivatedAfterChange()        { return IsItemDeactivatedAfterEdit(); }
-    // OBSOLETED in 1.61 (from Apr 2018)
-    IMGUI_API bool      InputFloat(const char* label, float* v, float step, float step_fast, int decimal_precision, ImGuiInputTextFlags extra_flags = 0); // Use the 'const char* format' version instead of 'decimal_precision'!
-    IMGUI_API bool      InputFloat2(const char* label, float v[2], int decimal_precision, ImGuiInputTextFlags extra_flags = 0);
-    IMGUI_API bool      InputFloat3(const char* label, float v[3], int decimal_precision, ImGuiInputTextFlags extra_flags = 0);
-    IMGUI_API bool      InputFloat4(const char* label, float v[4], int decimal_precision, ImGuiInputTextFlags extra_flags = 0);
-    // OBSOLETED in 1.60 (from Dec 2017)
+    // OBSOLETED in 1.61 (between Apr 2018 and Aug 2018)
+    IMGUI_API bool      InputFloat(const char* label, float* v, float step, float step_fast, int decimal_precision, ImGuiInputTextFlags flags = 0); // Use the 'const char* format' version instead of 'decimal_precision'!
+    IMGUI_API bool      InputFloat2(const char* label, float v[2], int decimal_precision, ImGuiInputTextFlags flags = 0);
+    IMGUI_API bool      InputFloat3(const char* label, float v[3], int decimal_precision, ImGuiInputTextFlags flags = 0);
+    IMGUI_API bool      InputFloat4(const char* label, float v[4], int decimal_precision, ImGuiInputTextFlags flags = 0);
+    // OBSOLETED in 1.60 (between Dec 2017 and Apr 2018)
     static inline bool  IsAnyWindowFocused()                  { return IsWindowFocused(ImGuiFocusedFlags_AnyWindow); }
     static inline bool  IsAnyWindowHovered()                  { return IsWindowHovered(ImGuiHoveredFlags_AnyWindow); }
     static inline ImVec2 CalcItemRectClosestPoint(const ImVec2& pos, bool on_edge = false, float outward = 0.f) { (void)on_edge; (void)outward; IM_ASSERT(0); return pos; }
@@ -1375,71 +1516,6 @@ typedef ImGuiInputTextCallbackData  ImGuiTextEditCallbackData;
 // Helpers
 //-----------------------------------------------------------------------------
 
-// Helper: Lightweight std::vector<> like class to avoid dragging dependencies (also: Windows implementation of STL with debug enabled is absurdly slow, so let's bypass it so our code runs fast in debug).
-// *Important* Our implementation does NOT call C++ constructors/destructors. This is intentional, we do not require it but you have to be mindful of that. Do _not_ use this class as a std::vector replacement in your code!
-template<typename T>
-class ImVector
-{
-public:
-    int                         Size;
-    int                         Capacity;
-    T*                          Data;
-
-    typedef T                   value_type;
-    typedef value_type*         iterator;
-    typedef const value_type*   const_iterator;
-
-    inline ImVector()           { Size = Capacity = 0; Data = NULL; }
-    inline ~ImVector()          { if (Data) ImGui::MemFree(Data); }
-    inline ImVector(const ImVector<T>& src)                     { Size = Capacity = 0; Data = NULL; operator=(src); }
-    inline ImVector<T>& operator=(const ImVector<T>& src)       { clear(); resize(src.Size); memcpy(Data, src.Data, (size_t)Size * sizeof(value_type)); return *this; }
-
-    inline bool                 empty() const                   { return Size == 0; }
-    inline int                  size() const                    { return Size; }
-    inline int                  capacity() const                { return Capacity; }
-    inline value_type&          operator[](int i)               { IM_ASSERT(i < Size); return Data[i]; }
-    inline const value_type&    operator[](int i) const         { IM_ASSERT(i < Size); return Data[i]; }
-
-    inline void                 clear()                         { if (Data) { Size = Capacity = 0; ImGui::MemFree(Data); Data = NULL; } }
-    inline iterator             begin()                         { return Data; }
-    inline const_iterator       begin() const                   { return Data; }
-    inline iterator             end()                           { return Data + Size; }
-    inline const_iterator       end() const                     { return Data + Size; }
-    inline value_type&          front()                         { IM_ASSERT(Size > 0); return Data[0]; }
-    inline const value_type&    front() const                   { IM_ASSERT(Size > 0); return Data[0]; }
-    inline value_type&          back()                          { IM_ASSERT(Size > 0); return Data[Size - 1]; }
-    inline const value_type&    back() const                    { IM_ASSERT(Size > 0); return Data[Size - 1]; }
-    inline void                 swap(ImVector<value_type>& rhs) { int rhs_size = rhs.Size; rhs.Size = Size; Size = rhs_size; int rhs_cap = rhs.Capacity; rhs.Capacity = Capacity; Capacity = rhs_cap; value_type* rhs_data = rhs.Data; rhs.Data = Data; Data = rhs_data; }
-
-    inline int          _grow_capacity(int sz) const            { int new_capacity = Capacity ? (Capacity + Capacity/2) : 8; return new_capacity > sz ? new_capacity : sz; }
-    inline void         resize(int new_size)                    { if (new_size > Capacity) reserve(_grow_capacity(new_size)); Size = new_size; }
-    inline void         resize(int new_size,const value_type& v){ if (new_size > Capacity) reserve(_grow_capacity(new_size)); if (new_size > Size) for (int n = Size; n < new_size; n++) memcpy(&Data[n], &v, sizeof(v)); Size = new_size; }
-    inline void         reserve(int new_capacity)
-    {
-        if (new_capacity <= Capacity)
-            return;
-        value_type* new_data = (value_type*)ImGui::MemAlloc((size_t)new_capacity * sizeof(value_type));
-        if (Data)
-        {
-            memcpy(new_data, Data, (size_t)Size * sizeof(value_type));
-            ImGui::MemFree(Data);
-        }
-        Data = new_data;
-        Capacity = new_capacity;
-    }
-
-    // NB: It is illegal to call push_back/push_front/insert with a reference pointing inside the ImVector data itself! e.g. v.push_back(v[10]) is forbidden.
-    inline void         push_back(const value_type& v)                  { if (Size == Capacity) reserve(_grow_capacity(Size + 1)); memcpy(&Data[Size], &v, sizeof(v)); Size++; }
-    inline void         pop_back()                                      { IM_ASSERT(Size > 0); Size--; }
-    inline void         push_front(const value_type& v)                 { if (Size == 0) push_back(v); else insert(Data, v); }
-    inline iterator     erase(const_iterator it)                        { IM_ASSERT(it >= Data && it < Data+Size); const ptrdiff_t off = it - Data; memmove(Data + off, Data + off + 1, ((size_t)Size - (size_t)off - 1) * sizeof(value_type)); Size--; return Data + off; }
-    inline iterator     erase(const_iterator it, const_iterator it_last){ IM_ASSERT(it >= Data && it < Data+Size && it_last > it && it_last <= Data+Size); const ptrdiff_t count = it_last - it; const ptrdiff_t off = it - Data; memmove(Data + off, Data + off + count, ((size_t)Size - (size_t)off - count) * sizeof(value_type)); Size -= (int)count; return Data + off; }
-    inline iterator     erase_unsorted(const_iterator it)               { IM_ASSERT(it >= Data && it < Data+Size);  const ptrdiff_t off = it - Data; if (it < Data+Size-1) memcpy(Data + off, Data + Size - 1, sizeof(value_type)); Size--; return Data + off; }
-    inline iterator     insert(const_iterator it, const value_type& v)  { IM_ASSERT(it >= Data && it <= Data+Size); const ptrdiff_t off = it - Data; if (Size == Capacity) reserve(_grow_capacity(Size + 1)); if (off < (int)Size) memmove(Data + off + 1, Data + off, ((size_t)Size - (size_t)off) * sizeof(value_type)); memcpy(&Data[off], &v, sizeof(v)); Size++; return Data + off; }
-    inline bool         contains(const value_type& v) const             { const T* data = Data;  const T* data_end = Data + Size; while (data < data_end) if (*data++ == v) return true; return false; }
-    inline int          index_from_pointer(const_iterator it) const     { IM_ASSERT(it >= Data && it <= Data+Size); const ptrdiff_t off = it - Data; return (int)off; }
-};
-
 // Helper: IM_NEW(), IM_PLACEMENT_NEW(), IM_DELETE() macros to call MemAlloc + Placement New, Placement Delete + MemFree
 // We call C++ constructor on own allocated memory via the placement "new(ptr) Type()" syntax.
 // Defining a custom placement new() with a dummy parameter allows us to bypass including <new> which on some platforms complains when user has disabled exceptions.
@@ -1460,8 +1536,8 @@ struct ImGuiOnceUponAFrame
 };
 
 // Helper: Macro for ImGuiOnceUponAFrame. Attention: The macro expands into 2 statement so make sure you don't use it within e.g. an if() statement without curly braces.
-#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS    // Will obsolete
-#define IMGUI_ONCE_UPON_A_FRAME     static ImGuiOnceUponAFrame imgui_oaf; if (imgui_oaf)
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+#define IMGUI_ONCE_UPON_A_FRAME     static ImGuiOnceUponAFrame imgui_oaf; if (imgui_oaf)    // OBSOLETED in 1.51, will remove!
 #endif
 
 // Helper: Parse and apply text filters. In format "aaaaa[,bbbb][,ccccc]"
@@ -1763,11 +1839,11 @@ struct ImDrawList
     IMGUI_API void  AddBezierCurve(const ImVec2& pos0, const ImVec2& cp0, const ImVec2& cp1, const ImVec2& pos1, ImU32 col, float thickness, int num_segments = 0);
 
     // Stateful path API, add points then finish with PathFillConvex() or PathStroke()
-    inline    void  PathClear()                                                 { _Path.resize(0); }
+    inline    void  PathClear()                                                 { _Path.Size = 0; }
     inline    void  PathLineTo(const ImVec2& pos)                               { _Path.push_back(pos); }
-    inline    void  PathLineToMergeDuplicate(const ImVec2& pos)                 { if (_Path.Size == 0 || memcmp(&_Path[_Path.Size-1], &pos, 8) != 0) _Path.push_back(pos); }
-    inline    void  PathFillConvex(ImU32 col)                                   { AddConvexPolyFilled(_Path.Data, _Path.Size, col); PathClear(); }  // Note: Anti-aliased filling requires points to be in clockwise order.
-    inline    void  PathStroke(ImU32 col, bool closed, float thickness = 1.0f)  { AddPolyline(_Path.Data, _Path.Size, col, closed, thickness); PathClear(); }
+    inline    void  PathLineToMergeDuplicate(const ImVec2& pos)                 { if (_Path.Size == 0 || memcmp(&_Path.Data[_Path.Size-1], &pos, 8) != 0) _Path.push_back(pos); }
+    inline    void  PathFillConvex(ImU32 col)                                   { AddConvexPolyFilled(_Path.Data, _Path.Size, col); _Path.Size = 0; }  // Note: Anti-aliased filling requires points to be in clockwise order.
+    inline    void  PathStroke(ImU32 col, bool closed, float thickness = 1.0f)  { AddPolyline(_Path.Data, _Path.Size, col, closed, thickness); _Path.Size = 0; }
     IMGUI_API void  PathArcTo(const ImVec2& centre, float radius, float a_min, float a_max, int num_segments = 10);
     IMGUI_API void  PathArcToFast(const ImVec2& centre, float radius, int a_min_of_12, int a_max_of_12);                                            // Use precomputed angles for a 12 steps circle
     IMGUI_API void  PathBezierCurveTo(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, int num_segments = 0);
@@ -1821,7 +1897,7 @@ struct ImDrawData
 };
 
 //-----------------------------------------------------------------------------
-// Font API (ImFontConfig, ImFontGlyph, ImFontAtlasFlags, ImFontAtlas, ImFont)
+// Font API (ImFontConfig, ImFontGlyph, ImFontAtlasFlags, ImFontAtlas, ImFontGlyphRangesBuilder, ImFont)
 //-----------------------------------------------------------------------------
 
 struct ImFontConfig
@@ -1858,6 +1934,21 @@ struct ImFontGlyph
     float           U0, V0, U1, V1;     // Texture coordinates
 };
 
+// Helper to build glyph ranges from text/string data. Feed your application strings/characters to it then call BuildRanges().
+// This is essentially a tightly packed of vector of 64k booleans = 8KB storage.
+struct ImFontGlyphRangesBuilder
+{
+    ImVector<int> UsedChars;            // Store 1-bit per Unicode code point (0=unused, 1=used)
+
+    ImFontGlyphRangesBuilder()          { UsedChars.resize(0x10000 / 32); memset(UsedChars.Data, 0, 0x10000 / 32); }
+    bool           GetBit(int n) const  { int off = (n >> 5); int mask = 1 << (n & 31); return (UsedChars[off] & mask) != 0; } // Get bit n in the array
+    void           SetBit(int n)        { int off = (n >> 5); int mask = 1 << (n & 31); UsedChars[off] |= mask; }              // Set bit n in the array
+    void           AddChar(ImWchar c)   { SetBit(c); }                          // Add character
+    IMGUI_API void AddText(const char* text, const char* text_end = NULL);      // Add string (each character of the UTF-8 string are added)
+    IMGUI_API void AddRanges(const ImWchar* ranges);                            // Add ranges, e.g. builder.AddRanges(ImFontAtlas::GetGlyphRangesDefault()) to force add all of ASCII/Latin+Ext
+    IMGUI_API void BuildRanges(ImVector<ImWchar>* out_ranges);                  // Output new ranges
+};
+
 enum ImFontAtlasFlags_
 {
     ImFontAtlasFlags_None               = 0,
@@ -1903,9 +1994,9 @@ struct ImFontAtlas
     // Building in RGBA32 format is provided for convenience and compatibility, but note that unless you manually manipulate or copy color data into 
     // the texture (e.g. when using the AddCustomRect*** api), then the RGB pixels emitted will always be white (~75% of memory/bandwidth waste.
     IMGUI_API bool              Build();                    // Build pixels data. This is called automatically for you by the GetTexData*** functions.
-    IMGUI_API bool              IsBuilt()                   { return Fonts.Size > 0 && (TexPixelsAlpha8 != NULL || TexPixelsRGBA32 != NULL); }
     IMGUI_API void              GetTexDataAsAlpha8(unsigned char** out_pixels, int* out_width, int* out_height, int* out_bytes_per_pixel = NULL);  // 1 byte per-pixel
     IMGUI_API void              GetTexDataAsRGBA32(unsigned char** out_pixels, int* out_width, int* out_height, int* out_bytes_per_pixel = NULL);  // 4 bytes-per-pixel
+    bool                        IsBuilt()                   { return Fonts.Size > 0 && (TexPixelsAlpha8 != NULL || TexPixelsRGBA32 != NULL); }
     void                        SetTexID(ImTextureID id)    { TexID = id; }
 
     //-------------------------------------------
@@ -1914,7 +2005,7 @@ struct ImFontAtlas
 
     // Helpers to retrieve list of common Unicode ranges (2 value per range, values are inclusive, zero-terminated list)
     // NB: Make sure that your string are UTF-8 and NOT in your local code page. In C++11, you can create UTF-8 string literal using the u8"Hello world" syntax. See FAQ for details.
-    // NB: Consider using GlyphRangesBuilder to build glyph ranges from textual data.
+    // NB: Consider using ImFontGlyphRangesBuilder to build glyph ranges from textual data.
     IMGUI_API const ImWchar*    GetGlyphRangesDefault();                // Basic Latin, Extended Latin
     IMGUI_API const ImWchar*    GetGlyphRangesKorean();                 // Default + Korean characters
     IMGUI_API const ImWchar*    GetGlyphRangesJapanese();               // Default + Hiragana, Katakana, Half-Width, Selection of 1946 Ideographs
@@ -1923,19 +2014,6 @@ struct ImFontAtlas
     IMGUI_API const ImWchar*    GetGlyphRangesCyrillic();               // Default + about 400 Cyrillic characters
     IMGUI_API const ImWchar*    GetGlyphRangesThai();                   // Default + Thai characters
 
-    // Helpers to build glyph ranges from text data. Feed your application strings/characters to it then call BuildRanges().
-    struct GlyphRangesBuilder
-    {
-        ImVector<unsigned char> UsedChars;  // Store 1-bit per Unicode code point (0=unused, 1=used)
-        GlyphRangesBuilder()                { UsedChars.resize(0x10000 / 8); memset(UsedChars.Data, 0, 0x10000 / 8); }
-        bool           GetBit(int n) const  { return (UsedChars[n >> 3] & (1 << (n & 7))) != 0; }
-        void           SetBit(int n)        { UsedChars[n >> 3] |= 1 << (n & 7); }  // Set bit 'c' in the array
-        void           AddChar(ImWchar c)   { SetBit(c); }                          // Add character
-        IMGUI_API void AddText(const char* text, const char* text_end = NULL);      // Add string (each character of the UTF-8 string are added)
-        IMGUI_API void AddRanges(const ImWchar* ranges);                            // Add ranges, e.g. builder.AddRanges(ImFontAtlas::GetGlyphRangesDefault()) to force add all of ASCII/Latin+Ext
-        IMGUI_API void BuildRanges(ImVector<ImWchar>* out_ranges);                  // Output new ranges
-    };
-
     //-------------------------------------------
     // Custom Rectangles/Glyphs API
     //-------------------------------------------
@@ -1970,7 +2048,7 @@ struct ImFontAtlas
     ImFontAtlasFlags            Flags;              // Build flags (see ImFontAtlasFlags_)
     ImTextureID                 TexID;              // User data to refer to the texture once it has been uploaded to user's graphic systems. It is passed back to you during rendering via the ImDrawCmd structure.
     int                         TexDesiredWidth;    // Texture width desired by user before Build(). Must be a power-of-two. If have many glyphs your graphics API have texture size restrictions you may want to increase texture width to decrease height.
-    int                         TexGlyphPadding;    // Padding between glyphs within texture in pixels. Defaults to 1.
+    int                         TexGlyphPadding;    // Padding between glyphs within texture in pixels. Defaults to 1. If your rendering method doesn't rely on bilinear filtering you may set this to 0.
 
     // [Internal]
     // NB: Access texture data via GetTexData*() calls! Which will setup a default font for you.
@@ -1984,6 +2062,10 @@ struct ImFontAtlas
     ImVector<CustomRect>        CustomRects;        // Rectangles for packing custom texture data into the atlas.
     ImVector<ImFontConfig>      ConfigData;         // Internal data
     int                         CustomRectIds[1];   // Identifiers of custom texture rectangle used by ImFontAtlas/ImDrawList
+
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+    typedef ImFontGlyphRangesBuilder GlyphRangesBuilder; // OBSOLETE 1.67+
+#endif
 };
 
 // Font runtime data and rendering

imgui_demo.cpp

@@ -1,4 +1,4 @@
-// dear imgui, v1.66b
+// dear imgui, v1.67
 // (demo code)
 
 // Message to the person tempted to delete this file when integrating Dear ImGui into their code base:
@@ -40,6 +40,7 @@ Index of this file:
 // [SECTION] Example App: Simple Overlay / ShowExampleAppSimpleOverlay()
 // [SECTION] Example App: Manipulating Window Titles / ShowExampleAppWindowTitles()
 // [SECTION] Example App: Custom Rendering using ImDrawList API / ShowExampleAppCustomRendering()
+// [SECTION] Example App: Documents Handling / ShowExampleAppDocuments()
 
 */
 
@@ -69,6 +70,10 @@ Index of this file:
 #pragma clang diagnostic ignored "-Wint-to-void-pointer-cast"   // warning : cast to 'void *' from smaller integer type 'int'
 #pragma clang diagnostic ignored "-Wformat-security"            // warning : warning: format string is not a string literal
 #pragma clang diagnostic ignored "-Wexit-time-destructors"      // warning : declaration requires an exit-time destructor       // exit-time destruction order is undefined. if MemFree() leads to users code that has been disabled before exit it might cause problems. ImGui coding style welcomes static/globals.
+#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"  // warning : zero as null pointer constant                  // some standard header variations use #define NULL 0
+#if __has_warning("-Wdouble-promotion")
+#pragma clang diagnostic ignored "-Wdouble-promotion"           // warning: implicit conversion from 'float' to 'double' when passing argument to function  // using printf() is a misery with this as C++ va_arg ellipsis changes float to double.
+#endif
 #if __has_warning("-Wreserved-id-macro")
 #pragma clang diagnostic ignored "-Wreserved-id-macro"          // warning : macro name is a reserved identifier                //
 #endif
@@ -102,6 +107,7 @@ Index of this file:
 #if !defined(IMGUI_DISABLE_DEMO_WINDOWS)
 
 // Forward Declarations
+static void ShowExampleAppDocuments(bool* p_open);
 static void ShowExampleAppMainMenuBar();
 static void ShowExampleAppConsole(bool* p_open);
 static void ShowExampleAppLog(bool* p_open);
@@ -168,6 +174,7 @@ static void ShowDemoWindowMisc();
 void ImGui::ShowDemoWindow(bool* p_open)
 {
     // Examples Apps (accessible from the "Examples" menu)
+    static bool show_app_documents = false;
     static bool show_app_main_menu_bar = false;
     static bool show_app_console = false;
     static bool show_app_log = false;
@@ -180,6 +187,7 @@ void ImGui::ShowDemoWindow(bool* p_open)
     static bool show_app_window_titles = false;
     static bool show_app_custom_rendering = false;
 
+    if (show_app_documents)           ShowExampleAppDocuments(&show_app_documents);     // Process the Document app next, as it may also use a DockSpace()
     if (show_app_main_menu_bar)       ShowExampleAppMainMenuBar();
     if (show_app_console)             ShowExampleAppConsole(&show_app_console);
     if (show_app_log)                 ShowExampleAppLog(&show_app_log);
@@ -199,7 +207,7 @@ void ImGui::ShowDemoWindow(bool* p_open)
 
     if (show_app_metrics)             { ImGui::ShowMetricsWindow(&show_app_metrics); }
     if (show_app_style_editor)        { ImGui::Begin("Style Editor", &show_app_style_editor); ImGui::ShowStyleEditor(); ImGui::End(); }
-    if (show_app_about)               { ShowAboutWindow(&show_app_about); }
+    if (show_app_about)               { ImGui::ShowAboutWindow(&show_app_about); }
 
     // Demonstrate the various window flags. Typically you would just use the default!
     static bool no_titlebar = false;
@@ -263,6 +271,7 @@ void ImGui::ShowDemoWindow(bool* p_open)
             ImGui::MenuItem("Simple overlay", NULL, &show_app_simple_overlay);
             ImGui::MenuItem("Manipulating window titles", NULL, &show_app_window_titles);
             ImGui::MenuItem("Custom rendering", NULL, &show_app_custom_rendering);
+            ImGui::MenuItem("Documents", NULL, &show_app_documents);
             ImGui::EndMenu();
         }
         if (ImGui::BeginMenu("Help"))
@@ -316,8 +325,9 @@ void ImGui::ShowDemoWindow(bool* p_open)
             ImGui::SameLine(); ShowHelpMarker("Instruct back-end to not alter mouse cursor shape and visibility.");
             ImGui::Checkbox("io.ConfigInputTextCursorBlink", &io.ConfigInputTextCursorBlink);
             ImGui::SameLine(); ShowHelpMarker("Set to false to disable blinking cursor, for users who consider it distracting");
-            ImGui::Checkbox("io.ConfigResizeWindowsFromEdges [beta]", &io.ConfigResizeWindowsFromEdges);
+            ImGui::Checkbox("io.ConfigWindowsResizeFromEdges", &io.ConfigWindowsResizeFromEdges);
             ImGui::SameLine(); ShowHelpMarker("Enable resizing of windows from their edges and from the lower-left corner.\nThis requires (io.BackendFlags & ImGuiBackendFlags_HasMouseCursors) because it needs mouse cursor feedback.");
+            ImGui::Checkbox("io.ConfigWindowsMoveFromTitleBarOnly", &io.ConfigWindowsMoveFromTitleBarOnly);
             ImGui::Checkbox("io.MouseDrawCursor", &io.MouseDrawCursor);
             ImGui::SameLine(); ShowHelpMarker("Instruct Dear ImGui to render a mouse cursor for you. Note that a mouse cursor rendered via your application GPU rendering path will feel more laggy than hardware cursor, but will be more in sync with your other visuals.\n\nSome desktop applications may use both kinds of cursors (e.g. enable software cursor only when resizing/dragging something).");
             ImGui::TreePop();
@@ -474,7 +484,7 @@ static void ShowDemoWindowWidgets()
             ImGui::SameLine(); ShowHelpMarker("You can apply arithmetic operators +,*,/ on numerical values.\n  e.g. [ 100 ], input \'*2\', result becomes [ 200 ]\nUse +- to subtract.\n");
 
             static float f0 = 0.001f;
-            ImGui::InputFloat("input float", &f0, 0.01f, 1.0f);
+            ImGui::InputFloat("input float", &f0, 0.01f, 1.0f, "%.3f");
 
             static double d0 = 999999.00000001;
             ImGui::InputDouble("input double", &d0, 0.01f, 1.0f, "%.8f");
@@ -1482,7 +1492,7 @@ static void ShowDemoWindowWidgets()
             ImGui::IsWindowHovered(ImGuiHoveredFlags_AnyWindow));
 
         ImGui::BeginChild("child", ImVec2(0, 50), true);
-        ImGui::Text("This is another child window for testing with the _ChildWindows flag.");
+        ImGui::Text("This is another child window for testing the _ChildWindows flag.");
         ImGui::EndChild();
         if (embed_all_inside_a_child_window)
             ImGui::EndChild();
@@ -1515,8 +1525,9 @@ static void ShowDemoWindowLayout()
     if (!ImGui::CollapsingHeader("Layout"))
         return;
 
-    if (ImGui::TreeNode("Child regions"))
+    if (ImGui::TreeNode("Child windows"))
     {
+        ShowHelpMarker("Use child windows to begin into a self-contained independent scrolling/clipping regions within a host window.");
         static bool disable_mouse_wheel = false;
         static bool disable_menu = false;
         ImGui::Checkbox("Disable Mouse Wheel", &disable_mouse_wheel);
@@ -1531,7 +1542,8 @@ static void ShowDemoWindowLayout()
 
         // Child 1: no border, enable horizontal scrollbar
         {
-            ImGui::BeginChild("Child1", ImVec2(ImGui::GetWindowContentRegionWidth() * 0.5f, 300), false, ImGuiWindowFlags_HorizontalScrollbar | (disable_mouse_wheel ? ImGuiWindowFlags_NoScrollWithMouse : 0));
+            ImGuiWindowFlags window_flags = ImGuiWindowFlags_HorizontalScrollbar | (disable_mouse_wheel ? ImGuiWindowFlags_NoScrollWithMouse : 0);
+            ImGui::BeginChild("Child1", ImVec2(ImGui::GetWindowContentRegionWidth() * 0.5f, 260), false, window_flags);
             for (int i = 0; i < 100; i++)
             {
                 ImGui::Text("%04d: scrollable region", i);
@@ -1547,8 +1559,9 @@ static void ShowDemoWindowLayout()
 
         // Child 2: rounded border
         {
+            ImGuiWindowFlags window_flags = (disable_mouse_wheel ? ImGuiWindowFlags_NoScrollWithMouse : 0) | (disable_menu ? 0 : ImGuiWindowFlags_MenuBar);
             ImGui::PushStyleVar(ImGuiStyleVar_ChildRounding, 5.0f);
-            ImGui::BeginChild("Child2", ImVec2(0, 300), true, (disable_mouse_wheel ? ImGuiWindowFlags_NoScrollWithMouse : 0) | (disable_menu ? 0 : ImGuiWindowFlags_MenuBar));
+            ImGui::BeginChild("Child2", ImVec2(0, 260), true, window_flags);
             if (!disable_menu && ImGui::BeginMenuBar())
             {
                 if (ImGui::BeginMenu("Menu"))
@@ -1570,6 +1583,27 @@ static void ShowDemoWindowLayout()
             ImGui::PopStyleVar();
         }
 
+        ImGui::Separator();
+
+        // Demonstrate a few extra things
+        // - Changing ImGuiCol_ChildBg (which is transparent black in default styles)
+        // - Using SetCursorPos() to position the child window (because the child window is an item from the POV of the parent window)
+        //   You can also call SetNextWindowPos() to position the child window. The parent window will effectively layout from this position.
+        // - Using ImGui::GetItemRectMin/Max() to query the "item" state (because the child window is an item from the POV of the parent window)
+        //   See "Widgets" -> "Querying Status (Active/Focused/Hovered etc.)" section for more details about this.
+        {
+            ImGui::SetCursorPosX(50);
+            ImGui::PushStyleColor(ImGuiCol_ChildBg, IM_COL32(255, 0, 0, 100));
+            ImGui::BeginChild("blah", ImVec2(200, 100), true, ImGuiWindowFlags_None);
+            for (int n = 0; n < 50; n++)
+                ImGui::Text("Some test %d", n);
+            ImGui::EndChild();
+            ImVec2 child_rect_min = ImGui::GetItemRectMin();
+            ImVec2 child_rect_max = ImGui::GetItemRectMax();
+            ImGui::PopStyleColor();
+            ImGui::Text("Rect of child window is: (%.0f,%.0f) (%.0f,%.0f)", child_rect_min.x, child_rect_min.y, child_rect_max.x, child_rect_max.y);
+        }
+
         ImGui::TreePop();
     }
 
@@ -1697,9 +1731,79 @@ static void ShowDemoWindowLayout()
         ImGui::TreePop();
     }
 
+    if (ImGui::TreeNode("Tabs"))
+    {
+        if (ImGui::TreeNode("Basic"))
+        {
+            ImGuiTabBarFlags tab_bar_flags = ImGuiTabBarFlags_None;
+            if (ImGui::BeginTabBar("MyTabBar", tab_bar_flags))
+            {
+                if (ImGui::BeginTabItem("Avocado"))
+                {
+                    ImGui::Text("This is the Avocado tab!\nblah blah blah blah blah");
+                    ImGui::EndTabItem();
+                }
+                if (ImGui::BeginTabItem("Broccoli"))
+                {
+                    ImGui::Text("This is the Broccoli tab!\nblah blah blah blah blah");
+                    ImGui::EndTabItem();
+                }
+                if (ImGui::BeginTabItem("Cucumber"))
+                {
+                    ImGui::Text("This is the Cucumber tab!\nblah blah blah blah blah");
+                    ImGui::EndTabItem();
+                }
+                ImGui::EndTabBar();
+            }
+            ImGui::Separator();
+            ImGui::TreePop();
+        }
+
+        if (ImGui::TreeNode("Advanced & Close Button"))
+        {
+            // Expose a couple of the available flags. In most cases you may just call BeginTabBar() with no flags (0).
+            static ImGuiTabBarFlags tab_bar_flags = ImGuiTabBarFlags_Reorderable;
+            ImGui::CheckboxFlags("ImGuiTabBarFlags_Reorderable", (unsigned int*)&tab_bar_flags, ImGuiTabBarFlags_Reorderable);
+            ImGui::CheckboxFlags("ImGuiTabBarFlags_AutoSelectNewTabs", (unsigned int*)&tab_bar_flags, ImGuiTabBarFlags_AutoSelectNewTabs);
+            ImGui::CheckboxFlags("ImGuiTabBarFlags_NoCloseWithMiddleMouseButton", (unsigned int*)&tab_bar_flags, ImGuiTabBarFlags_NoCloseWithMiddleMouseButton);
+            if ((tab_bar_flags & ImGuiTabBarFlags_FittingPolicyMask_) == 0)
+                tab_bar_flags |= ImGuiTabBarFlags_FittingPolicyDefault_;
+            if (ImGui::CheckboxFlags("ImGuiTabBarFlags_FittingPolicyResizeDown", (unsigned int*)&tab_bar_flags, ImGuiTabBarFlags_FittingPolicyResizeDown))
+                tab_bar_flags &= ~(ImGuiTabBarFlags_FittingPolicyMask_ ^ ImGuiTabBarFlags_FittingPolicyResizeDown);
+            if (ImGui::CheckboxFlags("ImGuiTabBarFlags_FittingPolicyScroll", (unsigned int*)&tab_bar_flags, ImGuiTabBarFlags_FittingPolicyScroll))
+                tab_bar_flags &= ~(ImGuiTabBarFlags_FittingPolicyMask_ ^ ImGuiTabBarFlags_FittingPolicyScroll);
+
+            // Tab Bar
+            const char* names[4] = { "Artichoke", "Beetroot", "Celery", "Daikon" };
+            static bool opened[4] = { true, true, true, true }; // Persistent user state
+            for (int n = 0; n < IM_ARRAYSIZE(opened); n++)
+            {
+                if (n > 0) { ImGui::SameLine(); }
+                ImGui::Checkbox(names[n], &opened[n]);
+            }
+
+            // Passing a bool* to BeginTabItem() is similar to passing one to Begin(): the underlying bool will be set to false when the tab is closed.
+            if (ImGui::BeginTabBar("MyTabBar", tab_bar_flags))
+            {
+                for (int n = 0; n < IM_ARRAYSIZE(opened); n++)
+                    if (opened[n] && ImGui::BeginTabItem(names[n], &opened[n]))
+                    {
+                        ImGui::Text("This is the %s tab!", names[n]);
+                        if (n & 1)
+                            ImGui::Text("I am an odd tab.");
+                        ImGui::EndTabItem();
+                    }
+                ImGui::EndTabBar();
+            }
+            ImGui::Separator();
+            ImGui::TreePop();
+        }
+        ImGui::TreePop();
+    }
+
     if (ImGui::TreeNode("Groups"))
     {
-        ImGui::TextWrapped("(Using ImGui::BeginGroup()/EndGroup() to layout items. BeginGroup() basically locks the horizontal position. EndGroup() bundles the whole group so that you can use functions such as IsItemHovered() on it.)");
+        ShowHelpMarker("Using ImGui::BeginGroup()/EndGroup() to layout items. BeginGroup() basically locks the horizontal position. EndGroup() bundles the whole group so that you can use functions such as IsItemHovered() on it.");
         ImGui::BeginGroup();
         {
             ImGui::BeginGroup();
@@ -1743,7 +1847,7 @@ static void ShowDemoWindowLayout()
 
     if (ImGui::TreeNode("Text Baseline Alignment"))
     {
-        ImGui::TextWrapped("(This is testing the vertical alignment that occurs on text to keep it at the same baseline as widgets. Lines only composed of text or \"small\" widgets fit in less vertical spaces than lines with normal widgets)");
+        ShowHelpMarker("This is testing the vertical alignment that gets applied on text to keep it aligned with widgets. Lines only composed of text or \"small\" widgets fit in less vertical spaces than lines with normal widgets.");
 
         ImGui::Text("One\nTwo\nThree"); ImGui::SameLine();
         ImGui::Text("Hello\nWorld"); ImGui::SameLine();
@@ -1798,7 +1902,8 @@ static void ShowDemoWindowLayout()
 
     if (ImGui::TreeNode("Scrolling"))
     {
-        ImGui::TextWrapped("(Use SetScrollHereY() or SetScrollFromPosY() to scroll to a given position.)");
+        ShowHelpMarker("Use SetScrollHereY() or SetScrollFromPosY() to scroll to a given position.");
+
         static bool track = true;
         static int track_line = 50, scroll_to_px = 200;
         ImGui::Checkbox("Track", &track);
@@ -1839,8 +1944,7 @@ static void ShowDemoWindowLayout()
 
     if (ImGui::TreeNode("Horizontal Scrolling"))
     {
-        ImGui::Bullet(); ImGui::TextWrapped("Horizontal scrolling for a window has to be enabled explicitly via the ImGuiWindowFlags_HorizontalScrollbar flag.");
-        ImGui::Bullet(); ImGui::TextWrapped("You may want to explicitly specify content width by calling SetNextWindowContentWidth() before Begin().");
+        ShowHelpMarker("Horizontal scrolling for a window has to be enabled explicitly via the ImGuiWindowFlags_HorizontalScrollbar flag.\n\nYou may want to explicitly specify content width by calling SetNextWindowContentWidth() before Begin().");
         static int lines = 7;
         ImGui::SliderInt("Lines", &lines, 1, 15);
         ImGui::PushStyleVar(ImGuiStyleVar_FrameRounding, 3.0f);
@@ -1879,7 +1983,7 @@ static void ShowDemoWindowLayout()
         {
             ImGui::BeginChild("scrolling"); // Demonstrate a trick: you can use Begin to set yourself in the context of another window (here we are already out of your child window)
             ImGui::SetScrollX(ImGui::GetScrollX() + scroll_x_delta);
-            ImGui::End();
+            ImGui::EndChild();
         }
         ImGui::TreePop();
     }
@@ -1888,7 +1992,7 @@ static void ShowDemoWindowLayout()
     {
         static ImVec2 size(100, 100), offset(50, 20);
         ImGui::TextWrapped("On a per-widget basis we are occasionally clipping text CPU-side if it won't fit in its frame. Otherwise we are doing coarser clipping + passing a scissor rectangle to the renderer. The system is designed to try minimizing both execution and CPU/GPU rendering cost.");
-        ImGui::DragFloat2("size", (float*)&size, 0.5f, 0.0f, 200.0f, "%.0f");
+        ImGui::DragFloat2("size", (float*)&size, 0.5f, 1.0f, 200.0f, "%.0f");
         ImGui::TextWrapped("(Click and drag)");
         ImVec2 pos = ImGui::GetCursorScreenPos();
         ImVec4 clip_rect(pos.x, pos.y, pos.x + size.x, pos.y + size.y);
@@ -1905,12 +2009,13 @@ static void ShowDemoWindowPopups()
     if (!ImGui::CollapsingHeader("Popups & Modal windows"))
         return;
 
-    // Popups are windows with a few special properties:
+    // The properties of popups windows are:
     // - They block normal mouse hovering detection outside them. (*)
     // - Unless modal, they can be closed by clicking anywhere outside them, or by pressing ESCAPE.
     // - Their visibility state (~bool) is held internally by imgui instead of being held by the programmer as we are used to with regular Begin() calls.
+    //   User can manipulate the visibility state by calling OpenPopup().
     // (*) One can use IsItemHovered(ImGuiHoveredFlags_AllowWhenBlockedByPopup) to bypass it and detect hovering even when normally blocked by a popup.
-    // Those three properties are intimately connected. The library needs to hold their visibility state because it can close popups at any time.
+    // Those three properties are connected. The library needs to hold their visibility state because it can close popups at any time.
 
     // Typical use for regular windows:
     //   bool my_tool_is_active = false; if (ImGui::Button("Open")) my_tool_is_active = true; [...] if (my_tool_is_active) Begin("My Tool", &my_tool_is_active) { [...] } End();
@@ -2039,6 +2144,7 @@ static void ShowDemoWindowPopups()
 
         if (ImGui::Button("Delete.."))
             ImGui::OpenPopup("Delete?");
+
         if (ImGui::BeginPopupModal("Delete?", NULL, ImGuiWindowFlags_AlwaysAutoResize))
         {
             ImGui::Text("All those beautiful files will be deleted.\nThis operation cannot be undone!\n\n");
@@ -2071,7 +2177,11 @@ static void ShowDemoWindowPopups()
 
             if (ImGui::Button("Add another modal.."))
                 ImGui::OpenPopup("Stacked 2");
-            if (ImGui::BeginPopupModal("Stacked 2"))
+
+            // Also demonstrate passing a bool* to BeginPopupModal(), this will create a regular close button which will close the popup.
+            // Note that the visibility state of popups is owned by imgui, so the input value of the bool actually doesn't matter here.
+            bool dummy_open = true;
+            if (ImGui::BeginPopupModal("Stacked 2", &dummy_open))
             {
                 ImGui::Text("Hello from Stacked The Second!");
                 if (ImGui::Button("Close"))
@@ -2458,8 +2568,12 @@ static void ShowDemoWindowMisc()
 
 void ImGui::ShowAboutWindow(bool* p_open)
 {
-    ImGui::Begin("About Dear ImGui", p_open, ImGuiWindowFlags_AlwaysAutoResize);
-    ImGui::Text("Dear ImGui, %s", ImGui::GetVersion());
+    if (!ImGui::Begin("About Dear ImGui", p_open, ImGuiWindowFlags_AlwaysAutoResize))
+    {
+        ImGui::End();
+        return;
+    }
+    ImGui::Text("Dear ImGui %s", ImGui::GetVersion());
     ImGui::Separator();
     ImGui::Text("By Omar Cornut and all dear imgui contributors.");
     ImGui::Text("Dear ImGui is licensed under the MIT License, see LICENSE for more information.");
@@ -2532,6 +2646,8 @@ void ImGui::ShowAboutWindow(bool* p_open)
         ImGui::Text("define: __clang_version__=%s", __clang_version__);
 #endif
         ImGui::Separator();
+        ImGui::Text("io.BackendPlatformName: %s", io.BackendPlatformName ? io.BackendPlatformName : "NULL");
+        ImGui::Text("io.BackendRendererName: %s", io.BackendRendererName ? io.BackendRendererName : "NULL");
         ImGui::Text("io.ConfigFlags: 0x%08X", io.ConfigFlags);
         if (io.ConfigFlags & ImGuiConfigFlags_NavEnableKeyboard)        ImGui::Text(" NavEnableKeyboard");
         if (io.ConfigFlags & ImGuiConfigFlags_NavEnableGamepad)         ImGui::Text(" NavEnableGamepad");
@@ -2539,18 +2655,15 @@ void ImGui::ShowAboutWindow(bool* p_open)
         if (io.ConfigFlags & ImGuiConfigFlags_NavNoCaptureKeyboard)     ImGui::Text(" NavNoCaptureKeyboard");
         if (io.ConfigFlags & ImGuiConfigFlags_NoMouse)                  ImGui::Text(" NoMouse");
         if (io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange)      ImGui::Text(" NoMouseCursorChange");
-        if (io.ConfigFlags & ImGuiConfigFlags_IsSRGB)               ImGui::Text(" IsSRGB");
-        if (io.ConfigFlags & ImGuiConfigFlags_IsTouchScreen)        ImGui::Text(" IsTouchScreen");
-        if (io.MouseDrawCursor)                                     ImGui::Text(" MouseDrawCursor");
-        if (io.ConfigMacOSXBehaviors)                               ImGui::Text(" ConfigMacOSXBehaviors");
-        if (io.ConfigInputTextCursorBlink)                          ImGui::Text(" ConfigInputTextCursorBlink");
-        if (io.ConfigResizeWindowsFromEdges)                        ImGui::Text(" ConfigResizeWindowsFromEdges");
+        if (io.MouseDrawCursor)                                         ImGui::Text("io.MouseDrawCursor");
+        if (io.ConfigMacOSXBehaviors)                                   ImGui::Text("io.ConfigMacOSXBehaviors");
+        if (io.ConfigInputTextCursorBlink)                              ImGui::Text("io.ConfigInputTextCursorBlink");
+        if (io.ConfigWindowsResizeFromEdges)                            ImGui::Text("io.ConfigWindowsResizeFromEdges");
+        if (io.ConfigWindowsMoveFromTitleBarOnly)                       ImGui::Text("io.ConfigWindowsMoveFromTitleBarOnly");
         ImGui::Text("io.BackendFlags: 0x%08X", io.BackendFlags);
         if (io.BackendFlags & ImGuiBackendFlags_HasGamepad)             ImGui::Text(" HasGamepad");
         if (io.BackendFlags & ImGuiBackendFlags_HasMouseCursors)        ImGui::Text(" HasMouseCursors");
         if (io.BackendFlags & ImGuiBackendFlags_HasSetMousePos)         ImGui::Text(" HasSetMousePos");
-        ImGui::Text("io.BackendPlatformName: %s", io.BackendPlatformName ? io.BackendPlatformName : "NULL");
-        ImGui::Text("io.BackendRendererName: %s", io.BackendRendererName ? io.BackendRendererName : "NULL");
         ImGui::Separator();
         ImGui::Text("io.Fonts: %d fonts, Flags: 0x%08X, TexSize: %d,%d", io.Fonts->Fonts.Size, io.Fonts->Flags, io.Fonts->TexWidth, io.Fonts->TexHeight);
         ImGui::Text("io.DisplaySize: %.2f,%.2f", io.DisplaySize.x, io.DisplaySize.y);
@@ -2651,20 +2764,13 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
     ImGui::SameLine();
     ShowHelpMarker("Save/Revert in local non-persistent storage. Default Colors definition are not affected. Use \"Export Colors\" below to save them somewhere.");
 
-    if (ImGui::TreeNode("Rendering"))
-    {
-        ImGui::Checkbox("Anti-aliased lines", &style.AntiAliasedLines); ImGui::SameLine(); ShowHelpMarker("When disabling anti-aliasing lines, you'll probably want to disable borders in your style as well.");
-        ImGui::Checkbox("Anti-aliased fill", &style.AntiAliasedFill);
-        ImGui::PushItemWidth(100);
-        ImGui::DragFloat("Curve Tessellation Tolerance", &style.CurveTessellationTol, 0.02f, 0.10f, FLT_MAX, "%.2f", 2.0f);
-        if (style.CurveTessellationTol < 0.10f) style.CurveTessellationTol = 0.10f;
-        ImGui::DragFloat("Global Alpha", &style.Alpha, 0.005f, 0.20f, 1.0f, "%.2f"); // Not exposing zero here so user doesn't "lose" the UI (zero alpha clips all widgets). But application code could have a toggle to switch between zero and non-zero.
-        ImGui::PopItemWidth();
-        ImGui::TreePop();
-    }
+    ImGui::Separator();
 
-    if (ImGui::TreeNode("Settings"))
+    if (ImGui::BeginTabBar("##tabs", ImGuiTabBarFlags_None))
     {
+        if (ImGui::BeginTabItem("Sizes"))
+        {
+            ImGui::Text("Main");
             ImGui::SliderFloat2("WindowPadding", (float*)&style.WindowPadding, 0.0f, 20.0f, "%.0f");
             ImGui::SliderFloat("PopupRounding", &style.PopupRounding, 0.0f, 16.0f, "%.0f");
             ImGui::SliderFloat2("FramePadding", (float*)&style.FramePadding, 0.0f, 20.0f, "%.0f");
@@ -2674,26 +2780,28 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
             ImGui::SliderFloat("IndentSpacing", &style.IndentSpacing, 0.0f, 30.0f, "%.0f");
             ImGui::SliderFloat("ScrollbarSize", &style.ScrollbarSize, 1.0f, 20.0f, "%.0f");
             ImGui::SliderFloat("GrabMinSize", &style.GrabMinSize, 1.0f, 20.0f, "%.0f");
-        ImGui::Text("BorderSize");
+            ImGui::Text("Borders");
             ImGui::SliderFloat("WindowBorderSize", &style.WindowBorderSize, 0.0f, 1.0f, "%.0f");
             ImGui::SliderFloat("ChildBorderSize", &style.ChildBorderSize, 0.0f, 1.0f, "%.0f");
             ImGui::SliderFloat("PopupBorderSize", &style.PopupBorderSize, 0.0f, 1.0f, "%.0f");
             ImGui::SliderFloat("FrameBorderSize", &style.FrameBorderSize, 0.0f, 1.0f, "%.0f");
+            ImGui::SliderFloat("TabBorderSize", &style.TabBorderSize, 0.0f, 1.0f, "%.0f");
             ImGui::Text("Rounding");
             ImGui::SliderFloat("WindowRounding", &style.WindowRounding, 0.0f, 14.0f, "%.0f");
             ImGui::SliderFloat("ChildRounding", &style.ChildRounding, 0.0f, 16.0f, "%.0f");
             ImGui::SliderFloat("FrameRounding", &style.FrameRounding, 0.0f, 12.0f, "%.0f");
             ImGui::SliderFloat("ScrollbarRounding", &style.ScrollbarRounding, 0.0f, 12.0f, "%.0f");
             ImGui::SliderFloat("GrabRounding", &style.GrabRounding, 0.0f, 12.0f, "%.0f");
+            ImGui::SliderFloat("TabRounding", &style.TabRounding, 0.0f, 12.0f, "%.0f");
             ImGui::Text("Alignment");
             ImGui::SliderFloat2("WindowTitleAlign", (float*)&style.WindowTitleAlign, 0.0f, 1.0f, "%.2f");
             ImGui::SliderFloat2("ButtonTextAlign", (float*)&style.ButtonTextAlign, 0.0f, 1.0f, "%.2f"); ImGui::SameLine(); ShowHelpMarker("Alignment applies when a button is larger than its text content.");
             ImGui::Text("Safe Area Padding"); ImGui::SameLine(); ShowHelpMarker("Adjust if you cannot see the edges of your screen (e.g. on a TV where scaling has not been configured).");
             ImGui::SliderFloat2("DisplaySafeAreaPadding", (float*)&style.DisplaySafeAreaPadding, 0.0f, 30.0f, "%.0f");
-        ImGui::TreePop();
+            ImGui::EndTabItem();
         }
 
-    if (ImGui::TreeNode("Colors"))
+        if (ImGui::BeginTabItem("Colors"))
         {
             static int output_dest = 0;
             static bool output_only_modified = true;
@@ -2716,17 +2824,16 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
             ImGui::SameLine(); ImGui::PushItemWidth(120); ImGui::Combo("##output_type", &output_dest, "To Clipboard\0To TTY\0"); ImGui::PopItemWidth();
             ImGui::SameLine(); ImGui::Checkbox("Only Modified Colors", &output_only_modified);
 
-        ImGui::Text("Tip: Left-click on colored square to open color picker,\nRight-click to open edit options menu.");
-
             static ImGuiTextFilter filter;
-        filter.Draw("Filter colors", 200);
+            filter.Draw("Filter colors", ImGui::GetFontSize() * 16);
 
             static ImGuiColorEditFlags alpha_flags = 0;
             ImGui::RadioButton("Opaque", &alpha_flags, 0); ImGui::SameLine();
             ImGui::RadioButton("Alpha", &alpha_flags, ImGuiColorEditFlags_AlphaPreview); ImGui::SameLine();
-        ImGui::RadioButton("Both", &alpha_flags, ImGuiColorEditFlags_AlphaPreviewHalf);
+            ImGui::RadioButton("Both", &alpha_flags, ImGuiColorEditFlags_AlphaPreviewHalf); ImGui::SameLine();
+            ShowHelpMarker("In the color list:\nLeft-click on colored square to open color picker,\nRight-click to open edit options menu.");
 
-        ImGui::BeginChild("#colors", ImVec2(0, 300), true, ImGuiWindowFlags_AlwaysVerticalScrollbar | ImGuiWindowFlags_AlwaysHorizontalScrollbar | ImGuiWindowFlags_NavFlattened);
+            ImGui::BeginChild("##colors", ImVec2(0, 0), true, ImGuiWindowFlags_AlwaysVerticalScrollbar | ImGuiWindowFlags_AlwaysHorizontalScrollbar | ImGuiWindowFlags_NavFlattened);
             ImGui::PushItemWidth(-160);
             for (int i = 0; i < ImGuiCol_COUNT; i++)
             {
@@ -2749,24 +2856,19 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
             ImGui::PopItemWidth();
             ImGui::EndChild();
 
-        ImGui::TreePop();
+            ImGui::EndTabItem();
         }
 
-    bool fonts_opened = ImGui::TreeNode("Fonts", "Fonts (%d)", ImGui::GetIO().Fonts->Fonts.Size);
-    if (fonts_opened)
+        if (ImGui::BeginTabItem("Fonts"))
         {
             ImFontAtlas* atlas = ImGui::GetIO().Fonts;
-        if (ImGui::TreeNode("Atlas texture", "Atlas texture (%dx%d pixels)", atlas->TexWidth, atlas->TexHeight))
-        {
-            ImGui::Image(atlas->TexID, ImVec2((float)atlas->TexWidth, (float)atlas->TexHeight), ImVec2(0,0), ImVec2(1,1), ImColor(255,255,255,255), ImColor(255,255,255,128));
-            ImGui::TreePop();
-        }
-        ImGui::PushItemWidth(100);
+            ShowHelpMarker("Read FAQ and misc/fonts/README.txt for details on font loading.");
+            ImGui::PushItemWidth(120);
             for (int i = 0; i < atlas->Fonts.Size; i++)
             {
                 ImFont* font = atlas->Fonts[i];
                 ImGui::PushID(font);
-            bool font_details_opened = ImGui::TreeNode(font, "Font %d: \'%s\', %.2f px, %d glyphs", i, font->ConfigData ? font->ConfigData[0].Name : "", font->FontSize, font->Glyphs.Size);
+                bool font_details_opened = ImGui::TreeNode(font, "Font %d: \"%s\"\n%.2f px, %d glyphs, %d file(s)", i, font->ConfigData ? font->ConfigData[0].Name : "", font->FontSize, font->Glyphs.Size, font->ConfigDataCount);
                 ImGui::SameLine(); if (ImGui::SmallButton("Set as default")) ImGui::GetIO().FontDefault = font;
                 if (font_details_opened)
                 {
@@ -2825,12 +2927,35 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
                 }
                 ImGui::PopID();
             }
+            if (ImGui::TreeNode("Atlas texture", "Atlas texture (%dx%d pixels)", atlas->TexWidth, atlas->TexHeight))
+            {
+                ImGui::Image(atlas->TexID, ImVec2((float)atlas->TexWidth, (float)atlas->TexHeight), ImVec2(0, 0), ImVec2(1, 1), ImColor(255, 255, 255, 255), ImColor(255, 255, 255, 128));
+                ImGui::TreePop();
+            }
+
             static float window_scale = 1.0f;
-        ImGui::DragFloat("this window scale", &window_scale, 0.005f, 0.3f, 2.0f, "%.1f");              // scale only this window
+            if (ImGui::DragFloat("this window scale", &window_scale, 0.005f, 0.3f, 2.0f, "%.1f"))           // scale only this window
+                ImGui::SetWindowFontScale(window_scale);
             ImGui::DragFloat("global scale", &ImGui::GetIO().FontGlobalScale, 0.005f, 0.3f, 2.0f, "%.1f");  // scale everything
             ImGui::PopItemWidth();
-        ImGui::SetWindowFontScale(window_scale);
-        ImGui::TreePop();
+
+            ImGui::EndTabItem();
+        }
+
+        if (ImGui::BeginTabItem("Rendering"))
+        {
+            ImGui::Checkbox("Anti-aliased lines", &style.AntiAliasedLines); ImGui::SameLine(); ShowHelpMarker("When disabling anti-aliasing lines, you'll probably want to disable borders in your style as well.");
+            ImGui::Checkbox("Anti-aliased fill", &style.AntiAliasedFill);
+            ImGui::PushItemWidth(100);
+            ImGui::DragFloat("Curve Tessellation Tolerance", &style.CurveTessellationTol, 0.02f, 0.10f, FLT_MAX, "%.2f", 2.0f);
+            if (style.CurveTessellationTol < 0.10f) style.CurveTessellationTol = 0.10f;
+            ImGui::DragFloat("Global Alpha", &style.Alpha, 0.005f, 0.20f, 1.0f, "%.2f"); // Not exposing zero here so user doesn't "lose" the UI (zero alpha clips all widgets). But application code could have a toggle to switch between zero and non-zero.
+            ImGui::PopItemWidth();
+
+            ImGui::EndTabItem();
+        }
+
+        ImGui::EndTabBar();
     }
 
     ImGui::PopItemWidth();
@@ -3254,10 +3379,15 @@ struct ExampleAppLog
 {
     ImGuiTextBuffer     Buf;
     ImGuiTextFilter     Filter;
-    ImVector<int>       LineOffsets;        // Index to lines offset
+    ImVector<int>       LineOffsets;        // Index to lines offset. We maintain this with AddLog() calls, allowing us to have a random access on lines
     bool                ScrollToBottom;
 
-    void    Clear()     { Buf.clear(); LineOffsets.clear(); }
+    void    Clear() 
+    { 
+        Buf.clear(); 
+        LineOffsets.clear(); 
+        LineOffsets.push_back(0);
+    }
 
     void    AddLog(const char* fmt, ...) IM_FMTARGS(2)
     {
@@ -3268,13 +3398,12 @@ struct ExampleAppLog
         va_end(args);
         for (int new_size = Buf.size(); old_size < new_size; old_size++)
             if (Buf[old_size] == '\n')
-                LineOffsets.push_back(old_size);
+                LineOffsets.push_back(old_size + 1);
         ScrollToBottom = true;
     }
 
     void    Draw(const char* title, bool* p_open = NULL)
     {
-        ImGui::SetNextWindowSize(ImVec2(500,400), ImGuiCond_FirstUseEver);
         if (!ImGui::Begin(title, p_open))
         {
             ImGui::End();
@@ -3287,24 +3416,47 @@ struct ExampleAppLog
         Filter.Draw("Filter", -100.0f);
         ImGui::Separator();
         ImGui::BeginChild("scrolling", ImVec2(0,0), false, ImGuiWindowFlags_HorizontalScrollbar);
-        if (copy) ImGui::LogToClipboard();
+        if (copy)
+            ImGui::LogToClipboard();
 
+        ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0, 0));
+        const char* buf = Buf.begin();
+        const char* buf_end = Buf.end();
         if (Filter.IsActive())
         {
-            const char* buf_begin = Buf.begin();
-            const char* line = buf_begin;
-            for (int line_no = 0; line != NULL; line_no++)
+            for (int line_no = 0; line_no < LineOffsets.Size; line_no++)
             {
-                const char* line_end = (line_no < LineOffsets.Size) ? buf_begin + LineOffsets[line_no] : NULL;
-                if (Filter.PassFilter(line, line_end))
-                    ImGui::TextUnformatted(line, line_end);
-                line = line_end && line_end[1] ? line_end + 1 : NULL;
+                const char* line_start = buf + LineOffsets[line_no];
+                const char* line_end = (line_no + 1 < LineOffsets.Size) ? (buf + LineOffsets[line_no + 1] - 1) : buf_end;
+                if (Filter.PassFilter(line_start, line_end))
+                    ImGui::TextUnformatted(line_start, line_end);
             }
         }
         else
         {
-            ImGui::TextUnformatted(Buf.begin());
+            // The simplest and easy way to display the entire buffer:
+            //   ImGui::TextUnformatted(buf_begin, buf_end); 
+            // And it'll just work. TextUnformatted() has specialization for large blob of text and will fast-forward to skip non-visible lines.
+            // Here we instead demonstrate using the clipper to only process lines that are within the visible area.
+            // If you have tens of thousands of items and their processing cost is non-negligible, coarse clipping them on your side is recommended.
+            // Using ImGuiListClipper requires A) random access into your data, and B) items all being the  same height, 
+            // both of which we can handle since we an array pointing to the beginning of each line of text.
+            // When using the filter (in the block of code above) we don't have random access into the data to display anymore, which is why we don't use the clipper.
+            // Storing or skimming through the search result would make it possible (and would be recommended if you want to search through tens of thousands of entries)
+            ImGuiListClipper clipper;
+            clipper.Begin(LineOffsets.Size);
+            while (clipper.Step())
+            {
+                for (int line_no = clipper.DisplayStart; line_no < clipper.DisplayEnd; line_no++)
+                {
+                    const char* line_start = buf + LineOffsets[line_no];
+                    const char* line_end = (line_no + 1 < LineOffsets.Size) ? (buf + LineOffsets[line_no + 1] - 1) : buf_end;
+                    ImGui::TextUnformatted(line_start, line_end);
                 }
+            }
+            clipper.End();
+        }
+        ImGui::PopStyleVar();
 
         if (ScrollToBottom)
             ImGui::SetScrollHereY(1.0f);
@@ -3319,15 +3471,23 @@ static void ShowExampleAppLog(bool* p_open)
 {
     static ExampleAppLog log;
 
-    // Demo: add random items (unless Ctrl is held)
-    static double last_time = -1.0;
-    double time = ImGui::GetTime();
-    if (time - last_time >= 0.20f && !ImGui::GetIO().KeyCtrl)
+    // For the demo: add a debug button before the normal log window contents
+    // We take advantage of the fact that multiple calls to Begin()/End() are appending to the same window.
+    ImGui::SetNextWindowSize(ImVec2(500, 400), ImGuiCond_FirstUseEver);
+    ImGui::Begin("Example: Log", p_open);
+    if (ImGui::SmallButton("Add 5 entries"))
     {
-        const char* random_words[] = { "system", "info", "warning", "error", "fatal", "notice", "log" };
-        log.AddLog("[%s] Hello, time is %.1f, frame count is %d\n", random_words[rand() % IM_ARRAYSIZE(random_words)], time, ImGui::GetFrameCount());
-        last_time = time;
+        static int counter = 0;
+        for (int n = 0; n < 5; n++)
+        {
+            const char* categories[3] = { "info", "warn", "error" };
+            const char* words[] = { "Bumfuzzled", "Cattywampus", "Snickersnee", "Abibliophobia", "Absquatulate", "Nincompoop", "Pauciloquent" };
+            log.AddLog("[%05d] [%s] Hello, current time is %.1f, here's a word: '%s'\n", 
+                ImGui::GetFrameCount(), categories[counter % IM_ARRAYSIZE(categories)], ImGui::GetTime(), words[counter % IM_ARRAYSIZE(words)]);
+            counter++;
         }
+    }
+    ImGui::End();
 
     log.Draw("Example: Log", p_open);
 }
@@ -3340,7 +3500,7 @@ static void ShowExampleAppLog(bool* p_open)
 static void ShowExampleAppLayout(bool* p_open)
 {
     ImGui::SetNextWindowSize(ImVec2(500, 440), ImGuiCond_FirstUseEver);
-    if (ImGui::Begin("Example: Layout", p_open, ImGuiWindowFlags_MenuBar))
+    if (ImGui::Begin("Example: Simple layout", p_open, ImGuiWindowFlags_MenuBar))
     {
         if (ImGui::BeginMenuBar())
         {
@@ -3370,7 +3530,20 @@ static void ShowExampleAppLayout(bool* p_open)
             ImGui::BeginChild("item view", ImVec2(0, -ImGui::GetFrameHeightWithSpacing())); // Leave room for 1 line below us
                 ImGui::Text("MyObject: %d", selected);
                 ImGui::Separator();
+                if (ImGui::BeginTabBar("##Tabs", ImGuiTabBarFlags_None))
+                {
+                    if (ImGui::BeginTabItem("Description"))
+                    {
                         ImGui::TextWrapped("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. ");
+                        ImGui::EndTabItem();
+                    }
+                    if (ImGui::BeginTabItem("Details"))
+                    {
+                        ImGui::Text("ID: 0123456789");
+                        ImGui::EndTabItem();
+                    }
+                    ImGui::EndTabBar();
+                }
             ImGui::EndChild();
             if (ImGui::Button("Revert")) {}
             ImGui::SameLine();
@@ -3597,7 +3770,7 @@ static void ShowExampleAppSimpleOverlay(bool* p_open)
     if (corner != -1)
         ImGui::SetNextWindowPos(window_pos, ImGuiCond_Always, window_pos_pivot);
     ImGui::SetNextWindowBgAlpha(0.3f); // Transparent background
-    if (ImGui::Begin("Example: Simple Overlay", p_open, (corner != -1 ? ImGuiWindowFlags_NoMove : 0) | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoSavedSettings | ImGuiWindowFlags_NoFocusOnAppearing | ImGuiWindowFlags_NoNav))
+    if (ImGui::Begin("Example: Simple overlay", p_open, (corner != -1 ? ImGuiWindowFlags_NoMove : 0) | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoSavedSettings | ImGuiWindowFlags_NoFocusOnAppearing | ImGuiWindowFlags_NoNav))
     {
         ImGui::Text("Simple overlay\n" "in the corner of the screen.\n" "(right-click to change position)");
         ImGui::Separator();
@@ -3761,6 +3934,276 @@ static void ShowExampleAppCustomRendering(bool* p_open)
     ImGui::End();
 }
 
+//-----------------------------------------------------------------------------
+// [SECTION] Example App: Documents Handling / ShowExampleAppDocuments()
+//-----------------------------------------------------------------------------
+
+// Simplified structure to mimic a Document model
+struct MyDocument
+{
+    const char* Name;           // Document title
+    bool        Open;           // Set when the document is open (in this demo, we keep an array of all available documents to simplify the demo)
+    bool        OpenPrev;       // Copy of Open from last update.
+    bool        Dirty;          // Set when the document has been modified
+    bool        WantClose;      // Set when the document 
+    ImVec4      Color;          // An arbitrary variable associated to the document
+
+    MyDocument(const char* name, bool open = true, const ImVec4& color = ImVec4(1.0f,1.0f,1.0f,1.0f))
+    { 
+        Name = name; 
+        Open = OpenPrev = open; 
+        Dirty = false; 
+        WantClose = false; 
+        Color = color; 
+    }
+    void DoOpen()       { Open = true; }
+    void DoQueueClose() { WantClose = true; }
+    void DoForceClose() { Open = false; Dirty = false; }
+    void DoSave()       { Dirty = false; }
+
+    // Display dummy contents for the Document
+    static void DisplayContents(MyDocument* doc)
+    {
+        ImGui::PushID(doc);
+        ImGui::Text("Document \"%s\"", doc->Name);
+        ImGui::PushStyleColor(ImGuiCol_Text, doc->Color);
+        ImGui::TextWrapped("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.");
+        ImGui::PopStyleColor();
+        if (ImGui::Button("Modify", ImVec2(100, 0)))
+            doc->Dirty = true;
+        ImGui::SameLine();
+        if (ImGui::Button("Save", ImVec2(100, 0)))
+            doc->DoSave();
+        ImGui::ColorEdit3("color", &doc->Color.x);  // Useful to test drag and drop and hold-dragged-to-open-tab behavior.
+        ImGui::PopID();
+    }
+
+    // Display context menu for the Document
+    static void DisplayContextMenu(MyDocument* doc)
+    {
+        if (!ImGui::BeginPopupContextItem())
+            return;
+
+        char buf[256];
+        sprintf(buf, "Save %s", doc->Name);
+        if (ImGui::MenuItem(buf, "CTRL+S", false, doc->Open))
+            doc->DoSave();
+        if (ImGui::MenuItem("Close", "CTRL+W", false, doc->Open))
+            doc->DoQueueClose();
+        ImGui::EndPopup();
+    }
+};
+
+struct ExampleAppDocuments
+{
+    ImVector<MyDocument> Documents;
+
+    ExampleAppDocuments()
+    {
+        Documents.push_back(MyDocument("Lettuce",             true,  ImVec4(0.4f, 0.8f, 0.4f, 1.0f)));
+        Documents.push_back(MyDocument("Eggplant",            true,  ImVec4(0.8f, 0.5f, 1.0f, 1.0f)));
+        Documents.push_back(MyDocument("Carrot",              true,  ImVec4(1.0f, 0.8f, 0.5f, 1.0f)));
+        Documents.push_back(MyDocument("Tomato",              false, ImVec4(1.0f, 0.3f, 0.4f, 1.0f)));
+        Documents.push_back(MyDocument("A Rather Long Title", false));
+        Documents.push_back(MyDocument("Some Document",       false));
+    }
+};
+
+// [Optional] Notify the system of Tabs/Windows closure that happened outside the regular tab interface.
+// If a tab has been closed programmatically (aka closed from another source such as the Checkbox() in the demo, as opposed
+// to clicking on the regular tab closing button) and stops being submitted, it will take a frame for the tab bar to notice its absence. 
+// During this frame there will be a gap in the tab bar, and if the tab that has disappeared was the selected one, the tab bar 
+// will report no selected tab during the frame. This will effectively give the impression of a flicker for one frame.
+// We call SetTabItemClosed() to manually notify the Tab Bar or Docking system of removed tabs to avoid this glitch.
+// Note that this completely optional, and only affect tab bars with the ImGuiTabBarFlags_Reorderable flag.
+static void NotifyOfDocumentsClosedElsewhere(ExampleAppDocuments& app)
+{
+    for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
+    {
+        MyDocument* doc = &app.Documents[doc_n];
+        if (!doc->Open && doc->OpenPrev)
+            ImGui::SetTabItemClosed(doc->Name);
+        doc->OpenPrev = doc->Open;
+    }
+}
+
+void ShowExampleAppDocuments(bool* p_open)
+{
+    static ExampleAppDocuments app;
+
+    if (!ImGui::Begin("Example: Documents", p_open, ImGuiWindowFlags_MenuBar))
+    {
+        ImGui::End();
+        return;
+    }
+
+    // Options
+    static bool opt_reorderable = true;
+    static ImGuiTabBarFlags opt_fitting_flags = ImGuiTabBarFlags_FittingPolicyDefault_;
+
+    // Menu
+    if (ImGui::BeginMenuBar())
+    {
+        if (ImGui::BeginMenu("File"))
+        {
+            int open_count = 0;
+            for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
+                open_count += app.Documents[doc_n].Open ? 1 : 0;
+
+            if (ImGui::BeginMenu("Open", open_count < app.Documents.Size))
+            {
+                for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
+                {
+                    MyDocument* doc = &app.Documents[doc_n];
+                    if (!doc->Open)
+                        if (ImGui::MenuItem(doc->Name))
+                            doc->DoOpen();
+                }
+                ImGui::EndMenu();
+            }
+            if (ImGui::MenuItem("Close All Documents", NULL, false, open_count > 0))
+                for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
+                    app.Documents[doc_n].DoQueueClose();
+            if (ImGui::MenuItem("Exit", "Alt+F4")) {}
+            ImGui::EndMenu();
+        }
+        ImGui::EndMenuBar();
+    }
+
+    // [Debug] List documents with one checkbox for each
+    for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
+    {
+        MyDocument* doc = &app.Documents[doc_n];
+        if (doc_n > 0)
+            ImGui::SameLine();
+        ImGui::PushID(doc);
+        if (ImGui::Checkbox(doc->Name, &doc->Open))
+            if (!doc->Open)
+                doc->DoForceClose();
+        ImGui::PopID();
+    }
+
+    ImGui::Separator();
+
+    // Submit Tab Bar and Tabs
+    {
+        ImGuiTabBarFlags tab_bar_flags = (opt_fitting_flags) | (opt_reorderable ? ImGuiTabBarFlags_Reorderable : 0);
+        if (ImGui::BeginTabBar("##tabs", tab_bar_flags))
+        {
+            if (opt_reorderable)
+                NotifyOfDocumentsClosedElsewhere(app);
+
+            // [DEBUG] Stress tests
+            //if ((ImGui::GetFrameCount() % 30) == 0) docs[1].Open ^= 1;            // [DEBUG] Automatically show/hide a tab. Test various interactions e.g. dragging with this on.
+            //if (ImGui::GetIO().KeyCtrl) ImGui::SetTabItemSelected(docs[1].Name);  // [DEBUG] Test SetTabItemSelected(), probably not very useful as-is anyway..
+
+            // Submit Tabs
+            for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
+            {
+                MyDocument* doc = &app.Documents[doc_n];
+                if (!doc->Open)
+                    continue;
+
+                ImGuiTabItemFlags tab_flags = (doc->Dirty ? ImGuiTabItemFlags_UnsavedDocument : 0);
+                bool visible = ImGui::BeginTabItem(doc->Name, &doc->Open, tab_flags);
+
+                // Cancel attempt to close when unsaved add to save queue so we can display a popup.
+                if (!doc->Open && doc->Dirty)
+                {
+                    doc->Open = true;
+                    doc->DoQueueClose();
+                }
+
+                MyDocument::DisplayContextMenu(doc);
+                if (visible)
+                {
+                    MyDocument::DisplayContents(doc);
+                    ImGui::EndTabItem();
+                }
+            }
+
+            ImGui::EndTabBar();
+        }
+    }
+
+    // Update closing queue
+    static ImVector<MyDocument*> close_queue;
+    if (close_queue.empty())
+    {
+        // Close queue is locked once we started a popup
+        for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
+        {
+            MyDocument* doc = &app.Documents[doc_n];
+            if (doc->WantClose)
+            {
+                doc->WantClose = false;
+                close_queue.push_back(doc);
+            }
+        }
+    }
+
+    // Display closing confirmation UI
+    if (!close_queue.empty())
+    {
+        int close_queue_unsaved_documents = 0;
+        for (int n = 0; n < close_queue.Size; n++)
+            if (close_queue[n]->Dirty)
+                close_queue_unsaved_documents++;
+
+        if (close_queue_unsaved_documents == 0)
+        {
+            // Close documents when all are unsaved
+            for (int n = 0; n < close_queue.Size; n++)
+                close_queue[n]->DoForceClose();
+            close_queue.clear();
+        }
+        else
+        {
+            if (!ImGui::IsPopupOpen("Save?"))
+                ImGui::OpenPopup("Save?");
+            if (ImGui::BeginPopupModal("Save?"))
+            {
+                ImGui::Text("Save change to the following items?");
+                ImGui::PushItemWidth(-1.0f);
+                ImGui::ListBoxHeader("##", close_queue_unsaved_documents, 6);
+                for (int n = 0; n < close_queue.Size; n++)
+                    if (close_queue[n]->Dirty)
+                        ImGui::Text("%s", close_queue[n]->Name);
+                ImGui::ListBoxFooter();
+
+                if (ImGui::Button("Yes", ImVec2(80, 0)))
+                {
+                    for (int n = 0; n < close_queue.Size; n++)
+                    {
+                        if (close_queue[n]->Dirty)
+                            close_queue[n]->DoSave();
+                        close_queue[n]->DoForceClose();
+                    }
+                    close_queue.clear();
+                    ImGui::CloseCurrentPopup();
+                }
+                ImGui::SameLine();
+                if (ImGui::Button("No", ImVec2(80, 0)))
+                {
+                    for (int n = 0; n < close_queue.Size; n++)
+                        close_queue[n]->DoForceClose();
+                    close_queue.clear();
+                    ImGui::CloseCurrentPopup();
+                }
+                ImGui::SameLine();
+                if (ImGui::Button("Cancel", ImVec2(80, 0)))
+                {
+                    close_queue.clear();
+                    ImGui::CloseCurrentPopup();
+                }
+                ImGui::EndPopup();
+            }
+        }
+    }
+
+    ImGui::End();
+}
+
 // End of Demo code
 #else
 

imgui_draw.cpp

@@ -1,4 +1,4 @@
-// dear imgui, v1.66b
+// dear imgui, v1.67
 // (drawing and font code)
 
 /*
@@ -12,7 +12,8 @@ Index of this file:
 // [SECTION] Helpers ShadeVertsXXX functions
 // [SECTION] ImFontConfig
 // [SECTION] ImFontAtlas
-// [SECTION] ImFontAtlas glyph ranges helpers + GlyphRangesBuilder
+// [SECTION] ImFontAtlas glyph ranges helpers
+// [SECTION] ImFontGlyphRangesBuilder
 // [SECTION] ImFont
 // [SECTION] Internal Render Helpers
 // [SECTION] Decompression code
@@ -56,6 +57,7 @@ Index of this file:
 #pragma clang diagnostic ignored "-Wfloat-equal"            // warning : comparing floating point with == or != is unsafe   // storing and comparing against same constants ok.
 #pragma clang diagnostic ignored "-Wglobal-constructors"    // warning : declaration requires a global destructor           // similar to above, not sure what the exact difference it.
 #pragma clang diagnostic ignored "-Wsign-conversion"        // warning : implicit conversion changes signedness             //
+#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"  // warning : zero as null pointer constant              // some standard header variations use #define NULL 0
 #if __has_warning("-Wcomma")
 #pragma clang diagnostic ignored "-Wcomma"                  // warning : possible misuse of comma operator here             //
 #endif
@@ -63,7 +65,7 @@ Index of this file:
 #pragma clang diagnostic ignored "-Wreserved-id-macro"      // warning : macro name is a reserved identifier                //
 #endif
 #if __has_warning("-Wdouble-promotion")
-#pragma clang diagnostic ignored "-Wdouble-promotion"       // warning: implicit conversion from 'float' to 'double' when passing argument to function
+#pragma clang diagnostic ignored "-Wdouble-promotion"       // warning: implicit conversion from 'float' to 'double' when passing argument to function  // using printf() is a misery with this as C++ va_arg ellipsis changes float to double.
 #endif
 #elif defined(__GNUC__)
 #pragma GCC diagnostic ignored "-Wunused-function"          // warning: 'xxxx' defined but not used
@@ -175,7 +177,7 @@ void ImGui::StyleColorsDark(ImGuiStyle* dst)
     colors[ImGuiCol_Text]                   = ImVec4(1.00f, 1.00f, 1.00f, 1.00f);
     colors[ImGuiCol_TextDisabled]           = ImVec4(0.50f, 0.50f, 0.50f, 1.00f);
     colors[ImGuiCol_WindowBg]               = ImVec4(0.06f, 0.06f, 0.06f, 0.94f);
-    colors[ImGuiCol_ChildBg]                = ImVec4(1.00f, 1.00f, 1.00f, 0.00f);
+    colors[ImGuiCol_ChildBg]                = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
     colors[ImGuiCol_PopupBg]                = ImVec4(0.08f, 0.08f, 0.08f, 0.94f);
     colors[ImGuiCol_Border]                 = ImVec4(0.43f, 0.43f, 0.50f, 0.50f);
     colors[ImGuiCol_BorderShadow]           = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
@@ -205,6 +207,11 @@ void ImGui::StyleColorsDark(ImGuiStyle* dst)
     colors[ImGuiCol_ResizeGrip]             = ImVec4(0.26f, 0.59f, 0.98f, 0.25f);
     colors[ImGuiCol_ResizeGripHovered]      = ImVec4(0.26f, 0.59f, 0.98f, 0.67f);
     colors[ImGuiCol_ResizeGripActive]       = ImVec4(0.26f, 0.59f, 0.98f, 0.95f);
+    colors[ImGuiCol_Tab]                    = ImLerp(colors[ImGuiCol_Header],       colors[ImGuiCol_TitleBgActive], 0.80f);
+    colors[ImGuiCol_TabHovered]             = colors[ImGuiCol_HeaderHovered];
+    colors[ImGuiCol_TabActive]              = ImLerp(colors[ImGuiCol_HeaderActive], colors[ImGuiCol_TitleBgActive], 0.60f);
+    colors[ImGuiCol_TabUnfocused]           = ImLerp(colors[ImGuiCol_Tab],          colors[ImGuiCol_TitleBg], 0.80f);
+    colors[ImGuiCol_TabUnfocusedActive]     = ImLerp(colors[ImGuiCol_TabActive],    colors[ImGuiCol_TitleBg], 0.40f);
     colors[ImGuiCol_PlotLines]              = ImVec4(0.61f, 0.61f, 0.61f, 1.00f);
     colors[ImGuiCol_PlotLinesHovered]       = ImVec4(1.00f, 0.43f, 0.35f, 1.00f);
     colors[ImGuiCol_PlotHistogram]          = ImVec4(0.90f, 0.70f, 0.00f, 1.00f);
@@ -255,6 +262,11 @@ void ImGui::StyleColorsClassic(ImGuiStyle* dst)
     colors[ImGuiCol_ResizeGrip]             = ImVec4(1.00f, 1.00f, 1.00f, 0.16f);
     colors[ImGuiCol_ResizeGripHovered]      = ImVec4(0.78f, 0.82f, 1.00f, 0.60f);
     colors[ImGuiCol_ResizeGripActive]       = ImVec4(0.78f, 0.82f, 1.00f, 0.90f);
+    colors[ImGuiCol_Tab]                    = ImLerp(colors[ImGuiCol_Header],       colors[ImGuiCol_TitleBgActive], 0.80f);
+    colors[ImGuiCol_TabHovered]             = colors[ImGuiCol_HeaderHovered];
+    colors[ImGuiCol_TabActive]              = ImLerp(colors[ImGuiCol_HeaderActive], colors[ImGuiCol_TitleBgActive], 0.60f);
+    colors[ImGuiCol_TabUnfocused]           = ImLerp(colors[ImGuiCol_Tab],          colors[ImGuiCol_TitleBg], 0.80f);
+    colors[ImGuiCol_TabUnfocusedActive]     = ImLerp(colors[ImGuiCol_TabActive],    colors[ImGuiCol_TitleBg], 0.40f);
     colors[ImGuiCol_PlotLines]              = ImVec4(1.00f, 1.00f, 1.00f, 1.00f);
     colors[ImGuiCol_PlotLinesHovered]       = ImVec4(0.90f, 0.70f, 0.00f, 1.00f);
     colors[ImGuiCol_PlotHistogram]          = ImVec4(0.90f, 0.70f, 0.00f, 1.00f);
@@ -306,6 +318,11 @@ void ImGui::StyleColorsLight(ImGuiStyle* dst)
     colors[ImGuiCol_ResizeGrip]             = ImVec4(0.80f, 0.80f, 0.80f, 0.56f);
     colors[ImGuiCol_ResizeGripHovered]      = ImVec4(0.26f, 0.59f, 0.98f, 0.67f);
     colors[ImGuiCol_ResizeGripActive]       = ImVec4(0.26f, 0.59f, 0.98f, 0.95f);
+    colors[ImGuiCol_Tab]                    = ImLerp(colors[ImGuiCol_Header],       colors[ImGuiCol_TitleBgActive], 0.90f);
+    colors[ImGuiCol_TabHovered]             = colors[ImGuiCol_HeaderHovered];
+    colors[ImGuiCol_TabActive]              = ImLerp(colors[ImGuiCol_HeaderActive], colors[ImGuiCol_TitleBgActive], 0.60f);
+    colors[ImGuiCol_TabUnfocused]           = ImLerp(colors[ImGuiCol_Tab],          colors[ImGuiCol_TitleBg], 0.80f);
+    colors[ImGuiCol_TabUnfocusedActive]     = ImLerp(colors[ImGuiCol_TabActive],    colors[ImGuiCol_TitleBg], 0.40f);
     colors[ImGuiCol_PlotLines]              = ImVec4(0.39f, 0.39f, 0.39f, 1.00f);
     colors[ImGuiCol_PlotLinesHovered]       = ImVec4(1.00f, 0.43f, 0.35f, 1.00f);
     colors[ImGuiCol_PlotHistogram]          = ImVec4(0.90f, 0.70f, 0.00f, 1.00f);
@@ -640,7 +657,13 @@ void ImDrawList::PrimQuadUV(const ImVec2& a, const ImVec2& b, const ImVec2& c, c
     _IdxWritePtr += 6;
 }
 
+// On AddPolyline() and AddConvexPolyFilled() we intentionally avoid using ImVec2 and superflous function calls to optimize debug/non-inlined builds.
+// Those macros expects l-values.
+#define IM_NORMALIZE2F_OVER_ZERO(VX,VY)                         { float d2 = VX*VX + VY*VY; if (d2 > 0.0f) { float inv_len = 1.0f / ImSqrt(d2); VX *= inv_len; VY *= inv_len; } }
+#define IM_NORMALIZE2F_OVER_EPSILON_CLAMP(VX,VY,EPS,INVLENMAX)  { float d2 = VX*VX + VY*VY; if (d2 > EPS)  { float inv_len = 1.0f / ImSqrt(d2); if (inv_len > INVLENMAX) inv_len = INVLENMAX; VX *= inv_len; VY *= inv_len; } }
+
 // TODO: Thickness anti-aliased lines cap are missing their AA fringe.
+// We avoid using the ImVec2 math operators here to reduce cost to a minimum for debug/non-inlined builds.
 void ImDrawList::AddPolyline(const ImVec2* points, const int points_count, ImU32 col, bool closed, float thickness)
 {
     if (points_count < 2)
@@ -670,10 +693,11 @@ void ImDrawList::AddPolyline(const ImVec2* points, const int points_count, ImU32
         for (int i1 = 0; i1 < count; i1++)
         {
             const int i2 = (i1+1) == points_count ? 0 : i1+1;
-            ImVec2 diff = points[i2] - points[i1];
-            diff *= ImInvLength(diff, 1.0f);
-            temp_normals[i1].x = diff.y;
-            temp_normals[i1].y = -diff.x;
+            float dx = points[i2].x - points[i1].x;
+            float dy = points[i2].y - points[i1].y;
+            IM_NORMALIZE2F_OVER_ZERO(dx, dy);
+            temp_normals[i1].x = dy;
+            temp_normals[i1].y = -dx;
         }
         if (!closed)
             temp_normals[points_count-1] = temp_normals[points_count-2];
@@ -696,17 +720,18 @@ void ImDrawList::AddPolyline(const ImVec2* points, const int points_count, ImU32
                 unsigned int idx2 = (i1+1) == points_count ? _VtxCurrentIdx : idx1+3;
 
                 // Average normals
-                ImVec2 dm = (temp_normals[i1] + temp_normals[i2]) * 0.5f;
-                float dmr2 = dm.x*dm.x + dm.y*dm.y;
-                if (dmr2 > 0.000001f)
-                {
-                    float scale = 1.0f / dmr2;
-                    if (scale > 100.0f) scale = 100.0f;
-                    dm *= scale;
-                }
-                dm *= AA_SIZE;
-                temp_points[i2*2+0] = points[i2] + dm;
-                temp_points[i2*2+1] = points[i2] - dm;
+                float dm_x = (temp_normals[i1].x + temp_normals[i2].x) * 0.5f;
+                float dm_y = (temp_normals[i1].y + temp_normals[i2].y) * 0.5f;
+                IM_NORMALIZE2F_OVER_EPSILON_CLAMP(dm_x, dm_y, 0.000001f, 100.0f)
+                dm_x *= AA_SIZE;
+                dm_y *= AA_SIZE;
+
+                // Add temporary vertexes
+                ImVec2* out_vtx = &temp_points[i2*2];
+                out_vtx[0].x = points[i2].x + dm_x;
+                out_vtx[0].y = points[i2].y + dm_y;
+                out_vtx[1].x = points[i2].x - dm_x;
+                out_vtx[1].y = points[i2].y - dm_y;
 
                 // Add indexes
                 _IdxWritePtr[0] = (ImDrawIdx)(idx2+0); _IdxWritePtr[1] = (ImDrawIdx)(idx1+0); _IdxWritePtr[2] = (ImDrawIdx)(idx1+2);
@@ -750,20 +775,24 @@ void ImDrawList::AddPolyline(const ImVec2* points, const int points_count, ImU32
                 unsigned int idx2 = (i1+1) == points_count ? _VtxCurrentIdx : idx1+4;
 
                 // Average normals
-                ImVec2 dm = (temp_normals[i1] + temp_normals[i2]) * 0.5f;
-                float dmr2 = dm.x*dm.x + dm.y*dm.y;
-                if (dmr2 > 0.000001f)
-                {
-                    float scale = 1.0f / dmr2;
-                    if (scale > 100.0f) scale = 100.0f;
-                    dm *= scale;
-                }
-                ImVec2 dm_out = dm * (half_inner_thickness + AA_SIZE);
-                ImVec2 dm_in = dm * half_inner_thickness;
-                temp_points[i2*4+0] = points[i2] + dm_out;
-                temp_points[i2*4+1] = points[i2] + dm_in;
-                temp_points[i2*4+2] = points[i2] - dm_in;
-                temp_points[i2*4+3] = points[i2] - dm_out;
+                float dm_x = (temp_normals[i1].x + temp_normals[i2].x) * 0.5f;
+                float dm_y = (temp_normals[i1].y + temp_normals[i2].y) * 0.5f;
+                IM_NORMALIZE2F_OVER_EPSILON_CLAMP(dm_x, dm_y, 0.000001f, 100.0f);
+                float dm_out_x = dm_x * (half_inner_thickness + AA_SIZE);
+                float dm_out_y = dm_y * (half_inner_thickness + AA_SIZE);
+                float dm_in_x = dm_x * half_inner_thickness;
+                float dm_in_y = dm_y * half_inner_thickness;
+
+                // Add temporary vertexes
+                ImVec2* out_vtx = &temp_points[i2*4];
+                out_vtx[0].x = points[i2].x + dm_out_x;
+                out_vtx[0].y = points[i2].y + dm_out_y;
+                out_vtx[1].x = points[i2].x + dm_in_x;
+                out_vtx[1].y = points[i2].y + dm_in_y;
+                out_vtx[2].x = points[i2].x - dm_in_x;
+                out_vtx[2].y = points[i2].y - dm_in_y;
+                out_vtx[3].x = points[i2].x - dm_out_x;
+                out_vtx[3].y = points[i2].y - dm_out_y;
 
                 // Add indexes
                 _IdxWritePtr[0]  = (ImDrawIdx)(idx2+1); _IdxWritePtr[1]  = (ImDrawIdx)(idx1+1); _IdxWritePtr[2]  = (ImDrawIdx)(idx1+2);
@@ -801,11 +830,13 @@ void ImDrawList::AddPolyline(const ImVec2* points, const int points_count, ImU32
             const int i2 = (i1+1) == points_count ? 0 : i1+1;
             const ImVec2& p1 = points[i1];
             const ImVec2& p2 = points[i2];
-            ImVec2 diff = p2 - p1;
-            diff *= ImInvLength(diff, 1.0f);
 
-            const float dx = diff.x * (thickness * 0.5f);
-            const float dy = diff.y * (thickness * 0.5f);
+            float dx = p2.x - p1.x;
+            float dy = p2.y - p1.y;
+            IM_NORMALIZE2F_OVER_ZERO(dx, dy);
+            dx *= (thickness * 0.5f);
+            dy *= (thickness * 0.5f);
+
             _VtxWritePtr[0].pos.x = p1.x + dy; _VtxWritePtr[0].pos.y = p1.y - dx; _VtxWritePtr[0].uv = uv; _VtxWritePtr[0].col = col;
             _VtxWritePtr[1].pos.x = p2.x + dy; _VtxWritePtr[1].pos.y = p2.y - dx; _VtxWritePtr[1].uv = uv; _VtxWritePtr[1].col = col;
             _VtxWritePtr[2].pos.x = p2.x - dy; _VtxWritePtr[2].pos.y = p2.y + dx; _VtxWritePtr[2].uv = uv; _VtxWritePtr[2].col = col;
@@ -820,6 +851,7 @@ void ImDrawList::AddPolyline(const ImVec2* points, const int points_count, ImU32
     }
 }
 
+// We intentionally avoid using ImVec2 and its math operators here to reduce cost to a minimum for debug/non-inlined builds.
 void ImDrawList::AddConvexPolyFilled(const ImVec2* points, const int points_count, ImU32 col)
 {
     if (points_count < 3)
@@ -851,10 +883,11 @@ void ImDrawList::AddConvexPolyFilled(const ImVec2* points, const int points_coun
         {
             const ImVec2& p0 = points[i0];
             const ImVec2& p1 = points[i1];
-            ImVec2 diff = p1 - p0;
-            diff *= ImInvLength(diff, 1.0f);
-            temp_normals[i0].x = diff.y;
-            temp_normals[i0].y = -diff.x;
+            float dx = p1.x - p0.x;
+            float dy = p1.y - p0.y;
+            IM_NORMALIZE2F_OVER_ZERO(dx, dy);
+            temp_normals[i0].x = dy;
+            temp_normals[i0].y = -dx;
         }
 
         for (int i0 = points_count-1, i1 = 0; i1 < points_count; i0 = i1++)
@@ -862,19 +895,15 @@ void ImDrawList::AddConvexPolyFilled(const ImVec2* points, const int points_coun
             // Average normals
             const ImVec2& n0 = temp_normals[i0];
             const ImVec2& n1 = temp_normals[i1];
-            ImVec2 dm = (n0 + n1) * 0.5f;
-            float dmr2 = dm.x*dm.x + dm.y*dm.y;
-            if (dmr2 > 0.000001f)
-            {
-                float scale = 1.0f / dmr2;
-                if (scale > 100.0f) scale = 100.0f;
-                dm *= scale;
-            }
-            dm *= AA_SIZE * 0.5f;
+            float dm_x = (n0.x + n1.x) * 0.5f;
+            float dm_y = (n0.y + n1.y) * 0.5f;
+            IM_NORMALIZE2F_OVER_EPSILON_CLAMP(dm_x, dm_y, 0.000001f, 100.0f);
+            dm_x *= AA_SIZE * 0.5f;
+            dm_y *= AA_SIZE * 0.5f;
 
             // Add vertices
-            _VtxWritePtr[0].pos = (points[i1] - dm); _VtxWritePtr[0].uv = uv; _VtxWritePtr[0].col = col;        // Inner
-            _VtxWritePtr[1].pos = (points[i1] + dm); _VtxWritePtr[1].uv = uv; _VtxWritePtr[1].col = col_trans;  // Outer
+            _VtxWritePtr[0].pos.x = (points[i1].x - dm_x); _VtxWritePtr[0].pos.y = (points[i1].y - dm_y); _VtxWritePtr[0].uv = uv; _VtxWritePtr[0].col = col;        // Inner
+            _VtxWritePtr[1].pos.x = (points[i1].x + dm_x); _VtxWritePtr[1].pos.y = (points[i1].y + dm_y); _VtxWritePtr[1].uv = uv; _VtxWritePtr[1].col = col_trans;  // Outer
             _VtxWritePtr += 2;
 
             // Add indexes for fringes
@@ -1513,11 +1542,11 @@ ImFont* ImFontAtlas::AddFont(const ImFontConfig* font_cfg)
     if (!font_cfg->MergeMode)
         Fonts.push_back(IM_NEW(ImFont));
     else
-        IM_ASSERT(!Fonts.empty()); // When using MergeMode make sure that a font has already been added before. You can use ImGui::GetIO().Fonts->AddFontDefault() to add the default imgui font.
+        IM_ASSERT(!Fonts.empty() && "Cannot use MergeMode for the first font"); // When using MergeMode make sure that a font has already been added before. You can use ImGui::GetIO().Fonts->AddFontDefault() to add the default imgui font.
 
     ConfigData.push_back(*font_cfg);
     ImFontConfig& new_font_cfg = ConfigData.back();
-    if (!new_font_cfg.DstFont)
+    if (new_font_cfg.DstFont == NULL)
         new_font_cfg.DstFont = Fonts.back();
     if (!new_font_cfg.FontDataOwnedByAtlas)
     {
@@ -1705,139 +1734,220 @@ void    ImFontAtlasBuildMultiplyRectAlpha8(const unsigned char table[256], unsig
             data[i] = table[data[i]];
 }
 
+// Temporary data for one source font (multiple source fonts can be merged into one destination ImFont)
+// (C++03 doesn't allow instancing ImVector<> with function-local types so we declare the type here.)
+struct ImFontBuildSrcData
+{
+    stbtt_fontinfo      FontInfo;
+    stbtt_pack_range    PackRange;          // Hold the list of codepoints to pack (essentially points to Codepoints.Data)
+    stbrp_rect*         Rects;              // Rectangle to pack. We first fill in their size and the packer will give us their position.
+    stbtt_packedchar*   PackedChars;        // Output glyphs
+    const ImWchar*      SrcRanges;          // Ranges as requested by user (user is allowed to request too much, e.g. 0x0020..0xFFFF)
+    int                 DstIndex;           // Index into atlas->Fonts[] and dst_tmp_array[]
+    int                 GlyphsHighest;      // Highest requested codepoint
+    int                 GlyphsCount;        // Glyph count (excluding missing glyphs and glyphs already set by an earlier source font)
+    ImBoolVector        GlyphsSet;          // Glyph bit map (random access, 1-bit per codepoint. This will be a maximum of 8KB)
+    ImVector<int>       GlyphsList;         // Glyph codepoints list (flattened version of GlyphsMap)
+};
+
+// Temporary data for one destination ImFont* (multiple source fonts can be merged into one destination ImFont)
+struct ImFontBuildDstData
+{
+    int                 SrcCount;           // Number of source fonts targeting this destination font.
+    int                 GlyphsHighest;
+    int                 GlyphsCount;
+    ImBoolVector        GlyphsSet;          // This is used to resolve collision when multiple sources are merged into a same destination font.
+};
+
+static void UnpackBoolVectorToFlatIndexList(const ImBoolVector* in, ImVector<int>* out)
+{
+    IM_ASSERT(sizeof(in->Storage.Data[0]) == sizeof(int));
+    const int* it_begin = in->Storage.begin();
+    const int* it_end = in->Storage.end();
+    for (const int* it = it_begin; it < it_end; it++)
+        if (int entries_32 = *it)
+            for (int bit_n = 0; bit_n < 32; bit_n++)
+                if (entries_32 & (1 << bit_n))
+                    out->push_back((int)((it - it_begin) << 5) + bit_n);
+}
+
 bool    ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
 {
     IM_ASSERT(atlas->ConfigData.Size > 0);
 
     ImFontAtlasBuildRegisterDefaultCustomRects(atlas);
 
+    // Clear atlas
     atlas->TexID = (ImTextureID)NULL;
     atlas->TexWidth = atlas->TexHeight = 0;
     atlas->TexUvScale = ImVec2(0.0f, 0.0f);
     atlas->TexUvWhitePixel = ImVec2(0.0f, 0.0f);
     atlas->ClearTexData();
 
-    // Count glyphs/ranges
-    int total_glyphs_count = 0;
-    int total_ranges_count = 0;
-    for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++)
+    // Temporary storage for building
+    ImVector<ImFontBuildSrcData> src_tmp_array;
+    ImVector<ImFontBuildDstData> dst_tmp_array;
+    src_tmp_array.resize(atlas->ConfigData.Size);
+    dst_tmp_array.resize(atlas->Fonts.Size);
+    memset(src_tmp_array.Data, 0, (size_t)src_tmp_array.size_in_bytes());
+    memset(dst_tmp_array.Data, 0, (size_t)dst_tmp_array.size_in_bytes());
+
+    // 1. Initialize font loading structure, check font data validity
+    for (int src_i = 0; src_i < atlas->ConfigData.Size; src_i++)
     {
-        ImFontConfig& cfg = atlas->ConfigData[input_i];
-        if (!cfg.GlyphRanges)
-            cfg.GlyphRanges = atlas->GetGlyphRangesDefault();
-        for (const ImWchar* in_range = cfg.GlyphRanges; in_range[0] && in_range[1]; in_range += 2, total_ranges_count++)
-            total_glyphs_count += (in_range[1] - in_range[0]) + 1;
-    }
-
-    // We need a width for the skyline algorithm. Using a dumb heuristic here to decide of width. User can override TexDesiredWidth and TexGlyphPadding if they wish.
-    // Width doesn't really matter much, but some API/GPU have texture size limitations and increasing width can decrease height.
-    atlas->TexWidth = (atlas->TexDesiredWidth > 0) ? atlas->TexDesiredWidth : (total_glyphs_count > 4000) ? 4096 : (total_glyphs_count > 2000) ? 2048 : (total_glyphs_count > 1000) ? 1024 : 512;
-    atlas->TexHeight = 0;
-
-    // Start packing
-    const int max_tex_height = 1024*32;
-    stbtt_pack_context spc = {};
-    if (!stbtt_PackBegin(&spc, NULL, atlas->TexWidth, max_tex_height, 0, atlas->TexGlyphPadding, NULL))
-        return false;
-    stbtt_PackSetOversampling(&spc, 1, 1);
-
-    // Pack our extra data rectangles first, so it will be on the upper-left corner of our texture (UV will have small values).
-    ImFontAtlasBuildPackCustomRects(atlas, spc.pack_info);
-
-    // Initialize font information (so we can error without any cleanup)
-    struct ImFontTempBuildData
-    {
-        stbtt_fontinfo      FontInfo;
-        stbrp_rect*         Rects;
-        int                 RectsCount;
-        stbtt_pack_range*   Ranges;
-        int                 RangesCount;
-    };
-    ImFontTempBuildData* tmp_array = (ImFontTempBuildData*)ImGui::MemAlloc((size_t)atlas->ConfigData.Size * sizeof(ImFontTempBuildData));
-    for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++)
-    {
-        ImFontConfig& cfg = atlas->ConfigData[input_i];
-        ImFontTempBuildData& tmp = tmp_array[input_i];
+        ImFontBuildSrcData& src_tmp = src_tmp_array[src_i];
+        ImFontConfig& cfg = atlas->ConfigData[src_i];
         IM_ASSERT(cfg.DstFont && (!cfg.DstFont->IsLoaded() || cfg.DstFont->ContainerAtlas == atlas));
 
+        // Find index from cfg.DstFont (we allow the user to set cfg.DstFont. Also it makes casual debugging nicer than when storing indices)
+        src_tmp.DstIndex = -1;
+        for (int output_i = 0; output_i < atlas->Fonts.Size && src_tmp.DstIndex == -1; output_i++)
+            if (cfg.DstFont == atlas->Fonts[output_i])
+                src_tmp.DstIndex = output_i;
+        IM_ASSERT(src_tmp.DstIndex != -1); // cfg.DstFont not pointing within atlas->Fonts[] array?
+        if (src_tmp.DstIndex == -1)
+            return false;
+
+        // Initialize helper structure for font loading and verify that the TTF/OTF data is correct
         const int font_offset = stbtt_GetFontOffsetForIndex((unsigned char*)cfg.FontData, cfg.FontNo);
         IM_ASSERT(font_offset >= 0 && "FontData is incorrect, or FontNo cannot be found.");
-        if (!stbtt_InitFont(&tmp.FontInfo, (unsigned char*)cfg.FontData, font_offset))
-        {
-            atlas->TexWidth = atlas->TexHeight = 0; // Reset output on failure
-            ImGui::MemFree(tmp_array);
+        if (!stbtt_InitFont(&src_tmp.FontInfo, (unsigned char*)cfg.FontData, font_offset))
             return false;
+
+        // Measure highest codepoints
+        ImFontBuildDstData& dst_tmp = dst_tmp_array[src_tmp.DstIndex];
+        src_tmp.SrcRanges = cfg.GlyphRanges ? cfg.GlyphRanges : atlas->GetGlyphRangesDefault();
+        for (const ImWchar* src_range = src_tmp.SrcRanges; src_range[0] && src_range[1]; src_range += 2)
+            src_tmp.GlyphsHighest = ImMax(src_tmp.GlyphsHighest, (int)src_range[1]);
+        dst_tmp.SrcCount++;
+        dst_tmp.GlyphsHighest = ImMax(dst_tmp.GlyphsHighest, src_tmp.GlyphsHighest);
+    }
+
+    // 2. For every requested codepoint, check for their presence in the font data, and handle redundancy or overlaps between source fonts to avoid unused glyphs.
+    int total_glyphs_count = 0;
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
+    {
+        ImFontBuildSrcData& src_tmp = src_tmp_array[src_i];
+        ImFontBuildDstData& dst_tmp = dst_tmp_array[src_tmp.DstIndex];
+        ImFontConfig& cfg = atlas->ConfigData[src_i];
+        src_tmp.GlyphsSet.Resize(src_tmp.GlyphsHighest + 1);
+        if (dst_tmp.SrcCount > 1 && dst_tmp.GlyphsSet.Storage.empty())
+            dst_tmp.GlyphsSet.Resize(dst_tmp.GlyphsHighest + 1);
+
+        for (const ImWchar* src_range = src_tmp.SrcRanges; src_range[0] && src_range[1]; src_range += 2)
+            for (int codepoint = src_range[0]; codepoint <= src_range[1]; codepoint++)
+            {
+                if (cfg.MergeMode && dst_tmp.GlyphsSet.GetBit(codepoint))   // Don't overwrite existing glyphs. We could make this an option (e.g. MergeOverwrite)
+                    continue;
+                if (!stbtt_FindGlyphIndex(&src_tmp.FontInfo, codepoint))    // It is actually in the font?
+                    continue;
+                
+                // Add to avail set/counters
+                src_tmp.GlyphsCount++;
+                dst_tmp.GlyphsCount++;
+                src_tmp.GlyphsSet.SetBit(codepoint, true);
+                if (dst_tmp.SrcCount > 1)
+                    dst_tmp.GlyphsSet.SetBit(codepoint, true);
+                total_glyphs_count++;
             }
     }
 
+    // 3. Unpack our bit map into a flat list (we now have all the Unicode points that we know are requested _and_ available _and_ not overlapping another)
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
+    {
+        ImFontBuildSrcData& src_tmp = src_tmp_array[src_i];
+        src_tmp.GlyphsList.reserve(src_tmp.GlyphsCount);
+        UnpackBoolVectorToFlatIndexList(&src_tmp.GlyphsSet, &src_tmp.GlyphsList);
+        src_tmp.GlyphsSet.Clear();
+        IM_ASSERT(src_tmp.GlyphsList.Size == src_tmp.GlyphsCount);
+    }
+    for (int dst_i = 0; dst_i < dst_tmp_array.Size; dst_i++)
+        dst_tmp_array[dst_i].GlyphsSet.Clear();
+    dst_tmp_array.clear();
+
     // Allocate packing character data and flag packed characters buffer as non-packed (x0=y0=x1=y1=0)
-    int buf_packedchars_n = 0, buf_rects_n = 0, buf_ranges_n = 0;
-    stbtt_packedchar* buf_packedchars = (stbtt_packedchar*)ImGui::MemAlloc(total_glyphs_count * sizeof(stbtt_packedchar));
-    stbrp_rect* buf_rects = (stbrp_rect*)ImGui::MemAlloc(total_glyphs_count * sizeof(stbrp_rect));
-    stbtt_pack_range* buf_ranges = (stbtt_pack_range*)ImGui::MemAlloc(total_ranges_count * sizeof(stbtt_pack_range));
-    memset(buf_packedchars, 0, total_glyphs_count * sizeof(stbtt_packedchar));
-    memset(buf_rects, 0, total_glyphs_count * sizeof(stbrp_rect));              // Unnecessary but let's clear this for the sake of sanity.
-    memset(buf_ranges, 0, total_ranges_count * sizeof(stbtt_pack_range));
+    // (We technically don't need to zero-clear buf_rects, but let's do it for the sake of sanity)
+    ImVector<stbrp_rect> buf_rects;
+    ImVector<stbtt_packedchar> buf_packedchars;
+    buf_rects.resize(total_glyphs_count);
+    buf_packedchars.resize(total_glyphs_count);
+    memset(buf_rects.Data, 0, (size_t)buf_rects.size_in_bytes());
+    memset(buf_packedchars.Data, 0, (size_t)buf_packedchars.size_in_bytes());
 
-    // First font pass: pack all glyphs (no rendering at this point, we are working with rectangles in an infinitely tall texture at this point)
-    for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++)
+    // 4. Gather glyphs sizes so we can pack them in our virtual canvas.
+    int total_surface = 0;
+    int buf_rects_out_n = 0;
+    int buf_packedchars_out_n = 0;
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
     {
-        ImFontConfig& cfg = atlas->ConfigData[input_i];
-        ImFontTempBuildData& tmp = tmp_array[input_i];
+        ImFontBuildSrcData& src_tmp = src_tmp_array[src_i];
+        if (src_tmp.GlyphsCount == 0)
+            continue;
 
-        // Setup ranges
-        int font_glyphs_count = 0;
-        int font_ranges_count = 0;
-        for (const ImWchar* in_range = cfg.GlyphRanges; in_range[0] && in_range[1]; in_range += 2, font_ranges_count++)
-            font_glyphs_count += (in_range[1] - in_range[0]) + 1;
-        tmp.Ranges = buf_ranges + buf_ranges_n;
-        tmp.RangesCount = font_ranges_count;
-        buf_ranges_n += font_ranges_count;
-        for (int i = 0; i < font_ranges_count; i++)
+        src_tmp.Rects = &buf_rects[buf_rects_out_n];
+        src_tmp.PackedChars = &buf_packedchars[buf_packedchars_out_n];
+        buf_rects_out_n += src_tmp.GlyphsCount;
+        buf_packedchars_out_n += src_tmp.GlyphsCount;
+
+        // Convert our ranges in the format stb_truetype wants
+        ImFontConfig& cfg = atlas->ConfigData[src_i];
+        src_tmp.PackRange.font_size = cfg.SizePixels;
+        src_tmp.PackRange.first_unicode_codepoint_in_range = 0;
+        src_tmp.PackRange.array_of_unicode_codepoints = src_tmp.GlyphsList.Data;
+        src_tmp.PackRange.num_chars = src_tmp.GlyphsList.Size;
+        src_tmp.PackRange.chardata_for_range = src_tmp.PackedChars;
+        src_tmp.PackRange.h_oversample = (unsigned char)cfg.OversampleH;
+        src_tmp.PackRange.v_oversample = (unsigned char)cfg.OversampleV;
+
+        // Gather the sizes of all rectangles we will need to pack (this loop is based on stbtt_PackFontRangesGatherRects)
+        const float scale = (cfg.SizePixels > 0) ? stbtt_ScaleForPixelHeight(&src_tmp.FontInfo, cfg.SizePixels) : stbtt_ScaleForMappingEmToPixels(&src_tmp.FontInfo, -cfg.SizePixels);
+        const int padding = atlas->TexGlyphPadding;
+        for (int glyph_i = 0; glyph_i < src_tmp.GlyphsList.Size; glyph_i++)
         {
-            const ImWchar* in_range = &cfg.GlyphRanges[i * 2];
-            stbtt_pack_range& range = tmp.Ranges[i];
-            range.font_size = cfg.SizePixels;
-            range.first_unicode_codepoint_in_range = in_range[0];
-            range.num_chars = (in_range[1] - in_range[0]) + 1;
-            range.chardata_for_range = buf_packedchars + buf_packedchars_n;
-            buf_packedchars_n += range.num_chars;
-        }
-
-        // Gather the sizes of all rectangle we need
-        tmp.Rects = buf_rects + buf_rects_n;
-        tmp.RectsCount = font_glyphs_count;
-        buf_rects_n += font_glyphs_count;
-        stbtt_PackSetOversampling(&spc, cfg.OversampleH, cfg.OversampleV);
-        int n = stbtt_PackFontRangesGatherRects(&spc, &tmp.FontInfo, tmp.Ranges, tmp.RangesCount, tmp.Rects);
-        IM_ASSERT(n == font_glyphs_count);
-
-        // Detect missing glyphs and replace them with a zero-sized box instead of relying on the default glyphs
-        // This allows us merging overlapping icon fonts more easily.
-        int rect_i = 0;
-        for (int range_i = 0; range_i < tmp.RangesCount; range_i++)
-            for (int char_i = 0; char_i < tmp.Ranges[range_i].num_chars; char_i++, rect_i++)
-                if (stbtt_FindGlyphIndex(&tmp.FontInfo, tmp.Ranges[range_i].first_unicode_codepoint_in_range + char_i) == 0)
-                    tmp.Rects[rect_i].w = tmp.Rects[rect_i].h = 0;
-
-        // Pack
-        stbrp_pack_rects((stbrp_context*)spc.pack_info, tmp.Rects, n);
-
-        // Extend texture height
-        // Also mark missing glyphs as non-packed so we don't attempt to render into them
-        for (int i = 0; i < n; i++)
-        {
-            if (tmp.Rects[i].w == 0 && tmp.Rects[i].h == 0)
-                tmp.Rects[i].was_packed = 0;
-            if (tmp.Rects[i].was_packed)
-                atlas->TexHeight = ImMax(atlas->TexHeight, tmp.Rects[i].y + tmp.Rects[i].h);
+            int x0, y0, x1, y1;
+            const int glyph_index_in_font = stbtt_FindGlyphIndex(&src_tmp.FontInfo, src_tmp.GlyphsList[glyph_i]);
+            IM_ASSERT(glyph_index_in_font != 0);
+            stbtt_GetGlyphBitmapBoxSubpixel(&src_tmp.FontInfo, glyph_index_in_font, scale * cfg.OversampleH, scale * cfg.OversampleV, 0, 0, &x0, &y0, &x1, &y1);
+            src_tmp.Rects[glyph_i].w = (stbrp_coord)(x1 - x0 + padding + cfg.OversampleH - 1);
+            src_tmp.Rects[glyph_i].h = (stbrp_coord)(y1 - y0 + padding + cfg.OversampleV - 1);
+            total_surface += src_tmp.Rects[glyph_i].w * src_tmp.Rects[glyph_i].h;
         }
     }
-    IM_ASSERT(buf_rects_n == total_glyphs_count);
-    IM_ASSERT(buf_packedchars_n == total_glyphs_count);
-    IM_ASSERT(buf_ranges_n == total_ranges_count);
 
-    // Create texture
+    // We need a width for the skyline algorithm, any width!
+    // The exact width doesn't really matter much, but some API/GPU have texture size limitations and increasing width can decrease height.
+    // User can override TexDesiredWidth and TexGlyphPadding if they wish, otherwise we use a simple heuristic to select the width based on expected surface.
+    const int surface_sqrt = (int)ImSqrt((float)total_surface) + 1;
+    atlas->TexHeight = 0;
+    if (atlas->TexDesiredWidth > 0)
+        atlas->TexWidth = atlas->TexDesiredWidth;
+    else
+        atlas->TexWidth = (surface_sqrt >= 4096*0.7f) ? 4096 : (surface_sqrt >= 2048*0.7f) ? 2048 : (surface_sqrt >= 1024*0.7f) ? 1024 : 512;
+
+    // 5. Start packing
+    // Pack our extra data rectangles first, so it will be on the upper-left corner of our texture (UV will have small values).
+    const int TEX_HEIGHT_MAX = 1024 * 32;
+    stbtt_pack_context spc = {};
+    stbtt_PackBegin(&spc, NULL, atlas->TexWidth, TEX_HEIGHT_MAX, 0, atlas->TexGlyphPadding, NULL);
+    ImFontAtlasBuildPackCustomRects(atlas, spc.pack_info);
+
+    // 6. Pack each source font. No rendering yet, we are working with rectangles in an infinitely tall texture at this point.
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
+    {
+        ImFontBuildSrcData& src_tmp = src_tmp_array[src_i];
+        if (src_tmp.GlyphsCount == 0)
+            continue;
+
+        stbrp_pack_rects((stbrp_context*)spc.pack_info, src_tmp.Rects, src_tmp.GlyphsCount);
+
+        // Extend texture height and mark missing glyphs as non-packed so we won't render them.
+        // FIXME: We are not handling packing failure here (would happen if we got off TEX_HEIGHT_MAX or if a single if larger than TexWidth?)
+        for (int glyph_i = 0; glyph_i < src_tmp.GlyphsCount; glyph_i++)
+            if (src_tmp.Rects[glyph_i].was_packed)
+                atlas->TexHeight = ImMax(atlas->TexHeight, src_tmp.Rects[glyph_i].y + src_tmp.Rects[glyph_i].h);
+    }
+
+    // 7. Allocate texture
     atlas->TexHeight = (atlas->Flags & ImFontAtlasFlags_NoPowerOfTwoHeight) ? (atlas->TexHeight + 1) : ImUpperPowerOfTwo(atlas->TexHeight);
     atlas->TexUvScale = ImVec2(1.0f / atlas->TexWidth, 1.0f / atlas->TexHeight);
     atlas->TexPixelsAlpha8 = (unsigned char*)ImGui::MemAlloc(atlas->TexWidth * atlas->TexHeight);
@@ -1845,41 +1955,46 @@ bool    ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
     spc.pixels = atlas->TexPixelsAlpha8;
     spc.height = atlas->TexHeight;
 
-    // Second pass: render font characters
-    for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++)
+    // 8. Render/rasterize font characters into the texture
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
     {
-        ImFontConfig& cfg = atlas->ConfigData[input_i];
-        ImFontTempBuildData& tmp = tmp_array[input_i];
-        stbtt_PackSetOversampling(&spc, cfg.OversampleH, cfg.OversampleV);
-        stbtt_PackFontRangesRenderIntoRects(&spc, &tmp.FontInfo, tmp.Ranges, tmp.RangesCount, tmp.Rects);
+        ImFontConfig& cfg = atlas->ConfigData[src_i];
+        ImFontBuildSrcData& src_tmp = src_tmp_array[src_i];
+        if (src_tmp.GlyphsCount == 0)
+            continue;
+
+        stbtt_PackFontRangesRenderIntoRects(&spc, &src_tmp.FontInfo, &src_tmp.PackRange, 1, src_tmp.Rects);
+
+        // Apply multiply operator
         if (cfg.RasterizerMultiply != 1.0f)
         {
             unsigned char multiply_table[256];
             ImFontAtlasBuildMultiplyCalcLookupTable(multiply_table, cfg.RasterizerMultiply);
-            for (const stbrp_rect* r = tmp.Rects; r != tmp.Rects + tmp.RectsCount; r++)
+            stbrp_rect* r = &src_tmp.Rects[0];
+            for (int glyph_i = 0; glyph_i < src_tmp.GlyphsCount; glyph_i++, r++)
                 if (r->was_packed)
-                    ImFontAtlasBuildMultiplyRectAlpha8(multiply_table, spc.pixels, r->x, r->y, r->w, r->h, spc.stride_in_bytes);
+                    ImFontAtlasBuildMultiplyRectAlpha8(multiply_table, atlas->TexPixelsAlpha8, r->x, r->y, r->w, r->h, atlas->TexWidth * 1);
         }
-        tmp.Rects = NULL;
+        src_tmp.Rects = NULL;
     }
 
     // End packing
     stbtt_PackEnd(&spc);
-    ImGui::MemFree(buf_rects);
-    buf_rects = NULL;
+    buf_rects.clear();
 
-    // Third pass: setup ImFont and glyphs for runtime
-    for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++)
+    // 9. Setup ImFont and glyphs for runtime
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
     {
-        ImFontConfig& cfg = atlas->ConfigData[input_i];
-        ImFontTempBuildData& tmp = tmp_array[input_i];
-        ImFont* dst_font = cfg.DstFont; // We can have multiple input fonts writing into a same destination font (when using MergeMode=true)
-        if (cfg.MergeMode)
-            dst_font->BuildLookupTable();
+        ImFontBuildSrcData& src_tmp = src_tmp_array[src_i];
+        if (src_tmp.GlyphsCount == 0)
+            continue;
 
-        const float font_scale = stbtt_ScaleForPixelHeight(&tmp.FontInfo, cfg.SizePixels);
+        ImFontConfig& cfg = atlas->ConfigData[src_i];
+        ImFont* dst_font = cfg.DstFont; // We can have multiple input fonts writing into a same destination font (when using MergeMode=true)
+
+        const float font_scale = stbtt_ScaleForPixelHeight(&src_tmp.FontInfo, cfg.SizePixels);
         int unscaled_ascent, unscaled_descent, unscaled_line_gap;
-        stbtt_GetFontVMetrics(&tmp.FontInfo, &unscaled_ascent, &unscaled_descent, &unscaled_line_gap);
+        stbtt_GetFontVMetrics(&src_tmp.FontInfo, &unscaled_ascent, &unscaled_descent, &unscaled_line_gap);
 
         const float ascent = ImFloor(unscaled_ascent * font_scale + ((unscaled_ascent > 0.0f) ? +1 : -1));
         const float descent = ImFloor(unscaled_descent * font_scale + ((unscaled_descent > 0.0f) ? +1 : -1));
@@ -1887,40 +2002,30 @@ bool    ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
         const float font_off_x = cfg.GlyphOffset.x;
         const float font_off_y = cfg.GlyphOffset.y + (float)(int)(dst_font->Ascent + 0.5f);
 
-        for (int i = 0; i < tmp.RangesCount; i++)
+        for (int glyph_i = 0; glyph_i < src_tmp.GlyphsCount; glyph_i++)
         {
-            stbtt_pack_range& range = tmp.Ranges[i];
-            for (int char_idx = 0; char_idx < range.num_chars; char_idx += 1)
-            {
-                const stbtt_packedchar& pc = range.chardata_for_range[char_idx];
-                if (!pc.x0 && !pc.x1 && !pc.y0 && !pc.y1)
-                    continue;
+            const int codepoint = src_tmp.GlyphsList[glyph_i];
+            const stbtt_packedchar& pc = src_tmp.PackedChars[glyph_i];
 
-                const int codepoint = range.first_unicode_codepoint_in_range + char_idx;
-                if (cfg.MergeMode && dst_font->FindGlyphNoFallback((ImWchar)codepoint))
-                    continue;
-
-                float char_advance_x_org = pc.xadvance;
-                float char_advance_x_mod = ImClamp(char_advance_x_org, cfg.GlyphMinAdvanceX, cfg.GlyphMaxAdvanceX);
+            const float char_advance_x_org = pc.xadvance;
+            const float char_advance_x_mod = ImClamp(char_advance_x_org, cfg.GlyphMinAdvanceX, cfg.GlyphMaxAdvanceX);
             float char_off_x = font_off_x;
             if (char_advance_x_org != char_advance_x_mod)
                 char_off_x += cfg.PixelSnapH ? (float)(int)((char_advance_x_mod - char_advance_x_org) * 0.5f) : (char_advance_x_mod - char_advance_x_org) * 0.5f;
             
+            // Register glyph
             stbtt_aligned_quad q;
             float dummy_x = 0.0f, dummy_y = 0.0f;
-                stbtt_GetPackedQuad(range.chardata_for_range, atlas->TexWidth, atlas->TexHeight, char_idx, &dummy_x, &dummy_y, &q, 0);
+            stbtt_GetPackedQuad(src_tmp.PackedChars, atlas->TexWidth, atlas->TexHeight, glyph_i, &dummy_x, &dummy_y, &q, 0);
             dst_font->AddGlyph((ImWchar)codepoint, q.x0 + char_off_x, q.y0 + font_off_y, q.x1 + char_off_x, q.y1 + font_off_y, q.s0, q.t0, q.s1, q.t1, char_advance_x_mod);
         }
     }
-    }
 
-    // Cleanup temporaries
-    ImGui::MemFree(buf_packedchars);
-    ImGui::MemFree(buf_ranges);
-    ImGui::MemFree(tmp_array);
+    // Cleanup temporary (ImVector doesn't honor destructor)
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
+        src_tmp_array[src_i].~ImFontBuildSrcData();
 
     ImFontAtlasBuildFinish(atlas);
-
     return true;
 }
 
@@ -1948,16 +2053,16 @@ void ImFontAtlasBuildSetupFont(ImFontAtlas* atlas, ImFont* font, ImFontConfig* f
     font->ConfigDataCount++;
 }
 
-void ImFontAtlasBuildPackCustomRects(ImFontAtlas* atlas, void* pack_context_opaque)
+void ImFontAtlasBuildPackCustomRects(ImFontAtlas* atlas, void* stbrp_context_opaque)
 {
-    stbrp_context* pack_context = (stbrp_context*)pack_context_opaque;
+    stbrp_context* pack_context = (stbrp_context*)stbrp_context_opaque;
 
     ImVector<ImFontAtlas::CustomRect>& user_rects = atlas->CustomRects;
     IM_ASSERT(user_rects.Size >= 1); // We expect at least the default custom rects to be registered, else something went wrong.
 
     ImVector<stbrp_rect> pack_rects;
     pack_rects.resize(user_rects.Size);
-    memset(pack_rects.Data, 0, sizeof(stbrp_rect) * user_rects.Size);
+    memset(pack_rects.Data, 0, (size_t)pack_rects.size_in_bytes());
     for (int i = 0; i < user_rects.Size; i++)
     {
         pack_rects[i].w = user_rects[i].Width;
@@ -2077,7 +2182,7 @@ static void UnpackAccumulativeOffsetsIntoRanges(int base_codepoint, const short*
 }
 
 //-------------------------------------------------------------------------
-// [SECTION] ImFontAtlas glyph ranges helpers + GlyphRangesBuilder
+// [SECTION] ImFontAtlas glyph ranges helpers
 //-------------------------------------------------------------------------
 
 const ImWchar*  ImFontAtlas::GetGlyphRangesChineseSimplifiedCommon()
@@ -2085,7 +2190,7 @@ const ImWchar*  ImFontAtlas::GetGlyphRangesChineseSimplifiedCommon()
     // Store 2500 regularly used characters for Simplified Chinese.
     // Sourced from https://zh.wiktionary.org/wiki/%E9%99%84%E5%BD%95:%E7%8E%B0%E4%BB%A3%E6%B1%89%E8%AF%AD%E5%B8%B8%E7%94%A8%E5%AD%97%E8%A1%A8
     // This table covers 97.97% of all characters used during the month in July, 1987.
-    // You can use ImFontAtlas::GlyphRangesBuilder to create your own ranges derived from this, by merging existing ranges or adding new characters.
+    // You can use ImFontGlyphRangesBuilder to create your own ranges derived from this, by merging existing ranges or adding new characters.
     // (Stored as accumulative offsets from the initial unicode codepoint 0x4E00. This encoding is designed to helps us compact the source code size.)
     static const short accumulative_offsets_from_0x4E00[] =
     {
@@ -2151,7 +2256,7 @@ const ImWchar*  ImFontAtlas::GetGlyphRangesJapanese()
     // 1946 common ideograms code points for Japanese
     // Sourced from http://theinstructionlimit.com/common-kanji-character-ranges-for-xna-spritefont-rendering
     // FIXME: Source a list of the revised 2136 Joyo Kanji list from 2010 and rebuild this.
-    // You can use ImFontAtlas::GlyphRangesBuilder to create your own ranges derived from this, by merging existing ranges or adding new characters.
+    // You can use ImFontGlyphRangesBuilder to create your own ranges derived from this, by merging existing ranges or adding new characters.
     // (Stored as accumulative offsets from the initial unicode codepoint 0x4E00. This encoding is designed to helps us compact the source code size.)
     static const short accumulative_offsets_from_0x4E00[] =
     {
@@ -2229,7 +2334,11 @@ const ImWchar*  ImFontAtlas::GetGlyphRangesThai()
     return &ranges[0];
 }
 
-void ImFontAtlas::GlyphRangesBuilder::AddText(const char* text, const char* text_end)
+//-----------------------------------------------------------------------------
+// [SECTION] ImFontGlyphRangesBuilder
+//-----------------------------------------------------------------------------
+
+void ImFontGlyphRangesBuilder::AddText(const char* text, const char* text_end)
 {
     while (text_end ? (text < text_end) : *text)
     {
@@ -2243,14 +2352,14 @@ void ImFontAtlas::GlyphRangesBuilder::AddText(const char* text, const char* text
     }
 }
 
-void ImFontAtlas::GlyphRangesBuilder::AddRanges(const ImWchar* ranges)
+void ImFontGlyphRangesBuilder::AddRanges(const ImWchar* ranges)
 {
     for (; ranges[0]; ranges += 2)
         for (ImWchar c = ranges[0]; c <= ranges[1]; c++)
             AddChar(c);
 }
 
-void ImFontAtlas::GlyphRangesBuilder::BuildRanges(ImVector<ImWchar>* out_ranges)
+void ImFontGlyphRangesBuilder::BuildRanges(ImVector<ImWchar>* out_ranges)
 {
     for (int n = 0; n < 0x10000; n++)
         if (GetBit(n))
@@ -2402,7 +2511,7 @@ const ImFontGlyph* ImFont::FindGlyph(ImWchar c) const
 {
     if (c >= IndexLookup.Size)
         return FallbackGlyph;
-    const ImWchar i = IndexLookup[c];
+    const ImWchar i = IndexLookup.Data[c];
     if (i == (ImWchar)-1)
         return FallbackGlyph;
     return &Glyphs.Data[i];
@@ -2412,7 +2521,7 @@ const ImFontGlyph* ImFont::FindGlyphNoFallback(ImWchar c) const
 {
     if (c >= IndexLookup.Size)
         return NULL;
-    const ImWchar i = IndexLookup[c];
+    const ImWchar i = IndexLookup.Data[c];
     if (i == (ImWchar)-1)
         return NULL;
     return &Glyphs.Data[i];
@@ -2472,7 +2581,7 @@ const char* ImFont::CalcWordWrapPositionA(float scale, const char* text, const c
             }
         }
 
-        const float char_width = ((int)c < IndexAdvanceX.Size ? IndexAdvanceX[(int)c] : FallbackAdvanceX);
+        const float char_width = ((int)c < IndexAdvanceX.Size ? IndexAdvanceX.Data[c] : FallbackAdvanceX);
         if (ImCharIsBlankW(c))
         {
             if (inside_word)
@@ -2589,7 +2698,7 @@ ImVec2 ImFont::CalcTextSizeA(float size, float max_width, float wrap_width, cons
                 continue;
         }
 
-        const float char_width = ((int)c < IndexAdvanceX.Size ? IndexAdvanceX[(int)c] : FallbackAdvanceX) * scale;
+        const float char_width = ((int)c < IndexAdvanceX.Size ? IndexAdvanceX.Data[c] : FallbackAdvanceX) * scale;
         if (line_width + char_width >= max_width)
         {
             s = prev_s;
@@ -2821,6 +2930,7 @@ void ImFont::RenderText(ImDrawList* draw_list, float size, ImVec2 pos, ImU32 col
 // - RenderMouseCursor()
 // - RenderArrowPointingAt()
 // - RenderRectFilledRangeH()
+// - RenderPixelEllipsis()
 //-----------------------------------------------------------------------------
 
 void ImGui::RenderMouseCursor(ImDrawList* draw_list, ImVec2 pos, float scale, ImGuiMouseCursor mouse_cursor)
@@ -2929,6 +3039,16 @@ void ImGui::RenderRectFilledRangeH(ImDrawList* draw_list, const ImRect& rect, Im
     draw_list->PathFillConvex(col);
 }
 
+// FIXME: Rendering an ellipsis "..." is a surprisingly tricky problem for us... we cannot rely on font glyph having it, 
+// and regular dot are typically too wide. If we render a dot/shape ourselves it comes with the risk that it wouldn't match 
+// the boldness or positioning of what the font uses...
+void ImGui::RenderPixelEllipsis(ImDrawList* draw_list, ImVec2 pos, int count, ImU32 col)
+{
+    ImFont* font = draw_list->_Data->Font;
+    pos.y += (float)(int)(font->DisplayOffset.y + font->Ascent + 0.5f - 1.0f);
+    for (int dot_n = 0; dot_n < count; dot_n++)
+        draw_list->AddRectFilled(ImVec2(pos.x + dot_n * 2.0f, pos.y), ImVec2(pos.x + dot_n * 2.0f + 1.0f, pos.y + 1.0f), col);
+}
 
 //-----------------------------------------------------------------------------
 // [SECTION] Decompression code

imgui_internal.h

@@ -1,4 +1,4 @@
-// dear imgui, v1.66b
+// dear imgui, v1.67
 // (internal structures/api)
 
 // You may use this file to debug, understand or extend ImGui features but we don't provide any guarantee of forward compatibility!
@@ -6,8 +6,27 @@
 //   #define IMGUI_DEFINE_MATH_OPERATORS
 // To implement maths operators for ImVec2 (disabled by default to not collide with using IM_VEC2_CLASS_EXTRA along with your own math types+operators)
 
+/*
+
+Index of this file:
+// Header mess
+// Forward declarations
+// STB libraries includes
+// Context pointer
+// Generic helpers
+// Misc data structures
+// Main imgui context
+// Tab bar, tab item
+// Internal API
+
+*/
+
 #pragma once
 
+//-----------------------------------------------------------------------------
+// Header mess
+//-----------------------------------------------------------------------------
+
 #ifndef IMGUI_VERSION
 #error Must include imgui.h before imgui_internal.h
 #endif
@@ -27,10 +46,14 @@
 #pragma clang diagnostic ignored "-Wunused-function"                // for stb_textedit.h
 #pragma clang diagnostic ignored "-Wmissing-prototypes"             // for stb_textedit.h
 #pragma clang diagnostic ignored "-Wold-style-cast"
+#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
+#if __has_warning("-Wdouble-promotion")
+#pragma clang diagnostic ignored "-Wdouble-promotion"
+#endif
 #endif
 
 //-----------------------------------------------------------------------------
-// Forward Declarations
+// Forward declarations
 //-----------------------------------------------------------------------------
 
 struct ImRect;                      // An axis-aligned rectangle (2 points)
@@ -49,6 +72,8 @@ struct ImGuiNextWindowData;         // Storage for SetNexWindow** functions
 struct ImGuiPopupRef;               // Storage for current popup stack
 struct ImGuiSettingsHandler;        // Storage for one type registered in the .ini file
 struct ImGuiStyleMod;               // Stacked style modifier, backup of modified data so we can restore it
+struct ImGuiTabBar;                 // Storage for a tab bar
+struct ImGuiTabItem;                // Storage for a tab item (within a tab bar)
 struct ImGuiWindow;                 // Storage for one window
 struct ImGuiWindowTempData;         // Temporary storage for one window (that's the data which in theory we could ditch at the end of the frame)
 struct ImGuiWindowSettings;         // Storage for window settings stored in .ini file (we keep one of those even if the actual window wasn't instanced during this session)
@@ -66,7 +91,7 @@ typedef int ImGuiSliderFlags;       // -> enum ImGuiSliderFlags_       // Flags:
 typedef int ImGuiDragFlags;         // -> enum ImGuiDragFlags_         // Flags: for DragBehavior()
 
 //-------------------------------------------------------------------------
-// STB libraries
+// STB libraries includes
 //-------------------------------------------------------------------------
 
 namespace ImGuiStb
@@ -82,7 +107,7 @@ namespace ImGuiStb
 } // namespace ImGuiStb
 
 //-----------------------------------------------------------------------------
-// Context
+// Context pointer
 //-----------------------------------------------------------------------------
 
 #ifndef GImGui
@@ -90,7 +115,7 @@ extern IMGUI_API ImGuiContext* GImGui;  // Current implicit ImGui context pointe
 #endif
 
 //-----------------------------------------------------------------------------
-// Helpers
+// Generic helpers
 //-----------------------------------------------------------------------------
 
 #define IM_PI           3.14159265358979323846f
@@ -99,6 +124,7 @@ extern IMGUI_API ImGuiContext* GImGui;  // Current implicit ImGui context pointe
 #else
 #define IM_NEWLINE      "\n"
 #endif
+#define IMGUI_DEBUG_LOG(_FMT,...)       printf("[%05d] " _FMT, GImGui->FrameCount, __VA_ARGS__)
 #define IM_STATIC_ASSERT(_COND)         typedef char static_assertion_##__line__[(_COND)?1:-1]
 #define IM_F32_TO_INT8_UNBOUND(_VAL)    ((int)((_VAL) * 255.0f + ((_VAL)>=0 ? 0.5f : -0.5f)))   // Unsaturated, for display purpose
 #define IM_F32_TO_INT8_SAT(_VAL)        ((int)(ImSaturate(_VAL) * 255.0f + 0.5f))               // Saturated, always output 0..255
@@ -140,6 +166,7 @@ IMGUI_API int           ImStricmp(const char* str1, const char* str2);
 IMGUI_API int           ImStrnicmp(const char* str1, const char* str2, size_t count);
 IMGUI_API void          ImStrncpy(char* dst, const char* src, size_t count);
 IMGUI_API char*         ImStrdup(const char* str);
+IMGUI_API char*         ImStrdupcpy(char* dst, size_t* p_dst_size, const char* str);
 IMGUI_API const char*   ImStrchrRange(const char* str_begin, const char* str_end, char c);
 IMGUI_API int           ImStrlenW(const ImWchar* str);
 IMGUI_API const char*   ImStreolRange(const char* str, const char* str_end);                // End end-of-line
@@ -213,6 +240,18 @@ static inline ImVec2 ImRotate(const ImVec2& v, float cos_a, float sin_a)
 static inline float  ImLinearSweep(float current, float target, float speed)    { if (current < target) return ImMin(current + speed, target); if (current > target) return ImMax(current - speed, target); return current; }
 static inline ImVec2 ImMul(const ImVec2& lhs, const ImVec2& rhs)                { return ImVec2(lhs.x * rhs.x, lhs.y * rhs.y); }
 
+// Helper: ImBoolVector. Store 1-bit per value.
+// Note that Resize() currently clears the whole vector.
+struct ImBoolVector
+{
+    ImVector<int>   Storage;
+    ImBoolVector()  { }
+    void            Resize(int sz)          { Storage.resize((sz + 31) >> 5); memset(Storage.Data, 0, (size_t)Storage.Size * sizeof(Storage.Data[0])); }
+    void            Clear()                 { Storage.clear(); }
+    bool            GetBit(int n) const     { int off = (n >> 5); int mask = 1 << (n & 31); return (Storage[off] & mask) != 0; }
+    void            SetBit(int n, bool v)   { int off = (n >> 5); int mask = 1 << (n & 31); if (v) Storage[off] |= mask; else Storage[off] &= ~mask; }
+};
+
 // Helper: ImPool<>. Basic keyed storage for contiguous instances, slow/amortized insertion, O(1) indexable, O(Log N) queries by ID over a dense/hot buffer,
 // Honor constructor/destructor. Add/remove invalidate all pointers. Indexes have the same lifetime as the associated object.
 typedef int ImPoolIdx;
@@ -238,10 +277,10 @@ struct IMGUI_API ImPool
 };
 
 //-----------------------------------------------------------------------------
-// Types
+// Misc data structures
 //-----------------------------------------------------------------------------
 
-// 1D vector (this odd construct is used to facilitate the transition between 1D and 2D and maintenance of some patches)
+// 1D vector (this odd construct is used to facilitate the transition between 1D and 2D, and the maintenance of some branches/patches)
 struct ImVec1
 {
     float               x;
@@ -314,15 +353,25 @@ enum ImGuiItemStatusFlags_
     ImGuiItemStatusFlags_HoveredRect        = 1 << 0,
     ImGuiItemStatusFlags_HasDisplayRect     = 1 << 1,
     ImGuiItemStatusFlags_Edited             = 1 << 2    // Value exposed by item was edited in the current frame (should match the bool return value of most widgets)
+
+#ifdef IMGUI_ENABLE_TEST_ENGINE
+    , // [imgui-test only]
+    ImGuiItemStatusFlags_Openable           = 1 << 10,  // 
+    ImGuiItemStatusFlags_Opened             = 1 << 11,  // 
+    ImGuiItemStatusFlags_Checkable          = 1 << 12,  // 
+    ImGuiItemStatusFlags_Checked            = 1 << 13   //
+#endif
 };
 
 // FIXME: this is in development, not exposed/functional as a generic feature yet.
+// Horizontal/Vertical enums are fixed to 0/1 so they may be used to index ImVec2
 enum ImGuiLayoutType_
 {
-    ImGuiLayoutType_Vertical,
-    ImGuiLayoutType_Horizontal
+    ImGuiLayoutType_Horizontal = 0,
+    ImGuiLayoutType_Vertical = 1
 };
 
+// X/Y enums are fixed to 0/1 so they may be used to index ImVec2
 enum ImGuiAxis
 {
     ImGuiAxis_None = -1,
@@ -392,6 +441,13 @@ enum ImGuiNavForward
     ImGuiNavForward_ForwardActive
 };
 
+enum ImGuiNavLayer
+{
+    ImGuiNavLayer_Main  = 0,    // Main scrolling layer
+    ImGuiNavLayer_Menu  = 1,    // Menu layer (access with Alt/ImGuiNavInput_Menu)
+    ImGuiNavLayer_COUNT
+};
+
 enum ImGuiPopupPositionPolicy
 {
     ImGuiPopupPositionPolicy_Default,
@@ -664,11 +720,21 @@ struct ImGuiNextWindowData
     }
 };
 
+struct ImGuiTabBarSortItem
+{
+    int         Index;
+    float       Width;
+};
+
+//-----------------------------------------------------------------------------
 // Main imgui context
+//-----------------------------------------------------------------------------
+
 struct ImGuiContext
 {
     bool                    Initialized;
-    bool                    FrameScopeActive;                   // Set by NewFrame(), cleared by EndFrame()/Render()
+    bool                    FrameScopeActive;                   // Set by NewFrame(), cleared by EndFrame()
+    bool                    FrameScopePushedImplicitWindow;     // Set by NewFrame(), cleared by EndFrame()
     bool                    FontAtlasOwnedByContext;            // Io.Fonts-> is owned by the ImGuiContext and will be destructed along with it.
     ImGuiIO                 IO;
     ImGuiStyle              Style;
@@ -717,7 +783,7 @@ struct ImGuiContext
     ImVector<ImGuiStyleMod> StyleModifiers;                     // Stack for PushStyleVar()/PopStyleVar()
     ImVector<ImFont*>       FontStack;                          // Stack for PushFont()/PopFont()
     ImVector<ImGuiPopupRef> OpenPopupStack;                     // Which popups are open (persistent)
-    ImVector<ImGuiPopupRef> CurrentPopupStack;                  // Which level of BeginPopup() we are in (reset every frame)
+    ImVector<ImGuiPopupRef> BeginPopupStack;                    // Which level of BeginPopup() we are in (reset every frame)
     ImGuiNextWindowData     NextWindowData;                     // Storage for SetNextWindow** functions
     bool                    NextTreeNodeOpenVal;                // Storage for SetNextTreeNode** functions
     ImGuiCond               NextTreeNodeOpenCond;
@@ -741,7 +807,7 @@ struct ImGuiContext
     float                   NavWindowingTimer;
     float                   NavWindowingHighlightAlpha;
     bool                    NavWindowingToggleLayer;
-    int                     NavLayer;                           // Layer we are navigating on. For now the system is hard-coded for 0=main contents and 1=menu/title bar, may expose layers later.
+    ImGuiNavLayer           NavLayer;                           // Layer we are navigating on. For now the system is hard-coded for 0=main contents and 1=menu/title bar, may expose layers later.
     int                     NavIdTabCounter;                    // == NavWindow->DC.FocusIdxTabCounter at time of NavId processing
     bool                    NavIdIsAlive;                       // Nav widget has been seen this frame ~~ NavRefRectRel is valid
     bool                    NavMousePosDirty;                   // When set we will update mouse position if (io.ConfigFlags & ImGuiConfigFlags_NavEnableSetMousePos) if set (NB: this not enabled by default)
@@ -786,6 +852,11 @@ struct ImGuiContext
     ImVector<unsigned char> DragDropPayloadBufHeap;             // We don't expose the ImVector<> directly
     unsigned char           DragDropPayloadBufLocal[8];         // Local buffer for small payloads
 
+    // Tab bars
+    ImPool<ImGuiTabBar>     TabBars;
+    ImVector<ImGuiTabBar*>  CurrentTabBar;
+    ImVector<ImGuiTabBarSortItem>   TabSortByWidthBuffer;
+
     // Widget state
     ImGuiInputTextState     InputTextState;
     ImFont                  InputTextPasswordFont;
@@ -798,6 +869,8 @@ struct ImGuiContext
     ImVec2                  ScrollbarClickDeltaToGrabCenter;    // Distance between mouse and center of grab box, normalized in parent space. Use storage?
     int                     TooltipOverrideCount;
     ImVector<char>          PrivateClipboard;                   // If no custom clipboard handler is defined
+
+    // Platform support
     ImVec2                  PlatformImePos, PlatformImeLastPos; // Cursor position request & last passed to the OS Input Method Editor
 
     // Settings
@@ -826,7 +899,7 @@ struct ImGuiContext
     ImGuiContext(ImFontAtlas* shared_font_atlas) : OverlayDrawList(NULL)
     {
         Initialized = false;
-        FrameScopeActive = false;
+        FrameScopeActive = FrameScopePushedImplicitWindow = false;
         Font = NULL;
         FontSize = FontBaseSize = 0.0f;
         FontAtlasOwnedByContext = shared_font_atlas ? false : true;
@@ -872,7 +945,7 @@ struct ImGuiContext
         NavWindowingTarget = NavWindowingTargetAnim = NavWindowingList = NULL;
         NavWindowingTimer = NavWindowingHighlightAlpha = 0.0f;
         NavWindowingToggleLayer = false;
-        NavLayer = 0;
+        NavLayer = ImGuiNavLayer_Main;
         NavIdTabCounter = INT_MAX;
         NavIdIsAlive = false;
         NavMousePosDirty = false;
@@ -961,12 +1034,12 @@ struct IMGUI_API ImGuiWindowTempData
     ImGuiItemStatusFlags    LastItemStatusFlags;
     ImRect                  LastItemRect;           // Interaction rect
     ImRect                  LastItemDisplayRect;    // End-user display rect (only valid if LastItemStatusFlags & ImGuiItemStatusFlags_HasDisplayRect)
-    bool                    NavHideHighlightOneFrame;
-    bool                    NavHasScroll;           // Set when scrolling can be used (ScrollMax > 0.0f)
-    int                     NavLayerCurrent;        // Current layer, 0..31 (we currently only use 0..1)
+    ImGuiNavLayer           NavLayerCurrent;        // Current layer, 0..31 (we currently only use 0..1)
     int                     NavLayerCurrentMask;    // = (1 << NavLayerCurrent) used by ItemAdd prior to clipping.
     int                     NavLayerActiveMask;     // Which layer have been written to (result from previous frame)
     int                     NavLayerActiveMaskNext; // Which layer have been written to (buffer for current frame)
+    bool                    NavHideHighlightOneFrame;
+    bool                    NavHasScroll;           // Set when scrolling can be used (ScrollMax > 0.0f)
     bool                    MenuBarAppending;       // FIXME: Remove this
     ImVec2                  MenuBarOffset;          // MenuBarOffset.x is sort of equivalent of a per-layer CursorPos.x, saved/restored as we switch to the menu bar. The only situation when MenuBarOffset.y is > 0 if when (SafeAreaPadding.y > FramePadding.y), often used on TVs.
     ImVector<ImGuiWindow*>  ChildWindows;
@@ -982,7 +1055,7 @@ struct IMGUI_API ImGuiWindowTempData
     ImVector<float>         ItemWidthStack;
     ImVector<float>         TextWrapPosStack;
     ImVector<ImGuiGroupData>GroupStack;
-    int                     StackSizesBackup[6];    // Store size of various stacks for asserting
+    short                   StackSizesBackup[6];    // Store size of various stacks for asserting
 
     ImVec1                  Indent;                 // Indentation / start position from left of window (increased by TreePush/TreePop, etc.)
     ImVec1                  GroupOffset;
@@ -1000,11 +1073,11 @@ struct IMGUI_API ImGuiWindowTempData
         LastItemId = 0;
         LastItemStatusFlags = 0;
         LastItemRect = LastItemDisplayRect = ImRect();
+        NavLayerActiveMask = NavLayerActiveMaskNext = 0x00;
+        NavLayerCurrent = ImGuiNavLayer_Main;
+        NavLayerCurrentMask = (1 << ImGuiNavLayer_Main);
         NavHideHighlightOneFrame = false;
         NavHasScroll = false;
-        NavLayerActiveMask = NavLayerActiveMaskNext = 0x00;
-        NavLayerCurrent = 0;
-        NavLayerCurrentMask = 1 << 0;
         MenuBarAppending = false;
         MenuBarOffset = ImVec2(0.0f, 0.0f);
         StateStorage = NULL;
@@ -1036,6 +1109,7 @@ struct IMGUI_API ImGuiWindow
     ImVec2                  WindowPadding;                      // Window padding at the time of begin.
     float                   WindowRounding;                     // Window rounding at the time of begin.
     float                   WindowBorderSize;                   // Window border size at the time of begin.
+    int                     NameBufLen;                         // Size of buffer storing Name. May be larger than strlen(Name)!
     ImGuiID                 MoveId;                             // == window->GetID("#MOVE")
     ImGuiID                 ChildId;                            // ID of corresponding item in parent window (for navigation to return from child window to parent window)
     ImVec2                  Scroll;
@@ -1052,9 +1126,9 @@ struct IMGUI_API ImGuiWindow
     bool                    Appearing;                          // Set during the frame where the window is appearing (or re-appearing)
     bool                    Hidden;                             // Do not display (== (HiddenFramesForResize > 0) ||
     bool                    HasCloseButton;                     // Set when the window has a close button (p_open != NULL)
-    int                     BeginCount;                         // Number of Begin() during the current frame (generally 0 or 1, 1+ if appending via multiple Begin/End pairs)
-    int                     BeginOrderWithinParent;             // Order within immediate parent window, if we are a child window. Otherwise 0.
-    int                     BeginOrderWithinContext;            // Order within entire imgui context. This is mostly used for debugging submission order related issues.
+    short                   BeginCount;                         // Number of Begin() during the current frame (generally 0 or 1, 1+ if appending via multiple Begin/End pairs)
+    short                   BeginOrderWithinParent;             // Order within immediate parent window, if we are a child window. Otherwise 0.
+    short                   BeginOrderWithinContext;            // Order within entire imgui context. This is mostly used for debugging submission order related issues.
     ImGuiID                 PopupId;                            // ID in the popup stack when this window is used as a popup/menu (because we use generic Name/ID for recycling)
     int                     AutoFitFramesX, AutoFitFramesY;
     bool                    AutoFitOnlyGrows;
@@ -1090,8 +1164,8 @@ struct IMGUI_API ImGuiWindow
     ImGuiWindow*            RootWindowForNav;                   // Point to ourself or first ancestor which doesn't have the NavFlattened flag.
 
     ImGuiWindow*            NavLastChildNavWindow;              // When going to the menu bar, we remember the child window we came from. (This could probably be made implicit if we kept g.Windows sorted by last focused including child window.)
-    ImGuiID                 NavLastIds[2];                      // Last known NavId for this window, per layer (0/1)
-    ImRect                  NavRectRel[2];                      // Reference rectangle, in window relative space
+    ImGuiID                 NavLastIds[ImGuiNavLayer_COUNT];    // Last known NavId for this window, per layer (0/1)
+    ImRect                  NavRectRel[ImGuiNavLayer_COUNT];    // Reference rectangle, in window relative space
 
     // Navigation / Focus
     // FIXME-NAV: Merge all this with the new Nav system, at least the request variables should be moved to ImGuiContext
@@ -1134,6 +1208,59 @@ struct ImGuiItemHoveredDataBackup
     void Restore() const    { ImGuiWindow* window = GImGui->CurrentWindow; window->DC.LastItemId = LastItemId; window->DC.LastItemStatusFlags = LastItemStatusFlags; window->DC.LastItemRect = LastItemRect; window->DC.LastItemDisplayRect = LastItemDisplayRect; }
 };
 
+//-----------------------------------------------------------------------------
+// Tab bar, tab item
+//-----------------------------------------------------------------------------
+
+enum ImGuiTabBarFlagsPrivate_
+{
+    ImGuiTabBarFlags_DockNode                   = 1 << 20,  // [Docking: Unused in Master Branch] Part of a dock node
+    ImGuiTabBarFlags_DockNodeIsDockSpace        = 1 << 21,  // [Docking: Unused in Master Branch] Part of an explicit dockspace node node
+    ImGuiTabBarFlags_IsFocused                  = 1 << 22,
+    ImGuiTabBarFlags_SaveSettings               = 1 << 23   // FIXME: Settings are handled by the docking system, this only request the tab bar to mark settings dirty when reordering tabs
+};
+
+// Storage for one active tab item (sizeof() 26~32 bytes)
+struct ImGuiTabItem
+{
+    ImGuiID             ID;
+    ImGuiTabItemFlags   Flags;
+    int                 LastFrameVisible;
+    int                 LastFrameSelected;      // This allows us to infer an ordered list of the last activated tabs with little maintenance
+    float               Offset;                 // Position relative to beginning of tab
+    float               Width;                  // Width currently displayed
+    float               WidthContents;          // Width of actual contents, stored during BeginTabItem() call
+
+    ImGuiTabItem()      { ID = Flags = 0; LastFrameVisible = LastFrameSelected = -1; Offset = Width = WidthContents = 0.0f; }
+};
+
+// Storage for a tab bar (sizeof() 92~96 bytes)
+struct ImGuiTabBar
+{
+    ImVector<ImGuiTabItem> Tabs;
+    ImGuiID             ID;                     // Zero for tab-bars used by docking
+    ImGuiID             SelectedTabId;          // Selected tab
+    ImGuiID             NextSelectedTabId;
+    ImGuiID             VisibleTabId;           // Can occasionally be != SelectedTabId (e.g. when previewing contents for CTRL+TAB preview)
+    int                 CurrFrameVisible;
+    int                 PrevFrameVisible;
+    ImRect              BarRect;
+    float               ContentsHeight;
+    float               OffsetMax;              // Distance from BarRect.Min.x, locked during layout
+    float               OffsetNextTab;          // Distance from BarRect.Min.x, incremented with each BeginTabItem() call, not used if ImGuiTabBarFlags_Reorderable if set.
+    float               ScrollingAnim;
+    float               ScrollingTarget;
+    ImGuiTabBarFlags    Flags;
+    ImGuiID             ReorderRequestTabId;
+    int                 ReorderRequestDir;
+    bool                WantLayout;
+    bool                VisibleTabWasSubmitted;
+    short               LastTabItemIdx;         // For BeginTabItem()/EndTabItem()
+
+    ImGuiTabBar();
+    int                 GetTabOrder(const ImGuiTabItem* tab) const { return Tabs.index_from_ptr(tab); }
+};
+
 //-----------------------------------------------------------------------------
 // Internal API
 // No guarantee of forward compatibility here.
@@ -1163,6 +1290,7 @@ namespace ImGui
     IMGUI_API float         GetWindowScrollMaxX(ImGuiWindow* window);
     IMGUI_API float         GetWindowScrollMaxY(ImGuiWindow* window);
     IMGUI_API ImRect        GetWindowAllowedExtentRect(ImGuiWindow* window);
+
     IMGUI_API void          SetCurrentFont(ImFont* font);
     inline ImFont*          GetDefaultFont() { ImGuiContext& g = *GImGui; return g.IO.FontDefault ? g.IO.FontDefault : g.IO.Fonts->Fonts[0]; }
 
@@ -1173,7 +1301,8 @@ namespace ImGui
     // NewFrame
     IMGUI_API void          UpdateHoveredWindowAndCaptureFlags();
     IMGUI_API void          StartMouseMovingWindow(ImGuiWindow* window);
-    IMGUI_API void          UpdateMouseMovingWindow();
+    IMGUI_API void          UpdateMouseMovingWindowNewFrame();
+    IMGUI_API void          UpdateMouseMovingWindowEndFrame();
 
     // Settings
     IMGUI_API void                  MarkIniSettingsDirty();
@@ -1210,10 +1339,9 @@ namespace ImGui
 
     // Popups, Modals, Tooltips
     IMGUI_API void          OpenPopupEx(ImGuiID id);
-    IMGUI_API void          ClosePopup(ImGuiID id);
-    IMGUI_API void          ClosePopupToLevel(int remaining);
+    IMGUI_API void          ClosePopupToLevel(int remaining, bool apply_focus_to_window_under);
     IMGUI_API void          ClosePopupsOverWindow(ImGuiWindow* ref_window);
-    IMGUI_API bool          IsPopupOpen(ImGuiID id);
+    IMGUI_API bool          IsPopupOpen(ImGuiID id); // Test for id within current popup stack level (currently begin-ed into); this doesn't scan the whole popup stack!
     IMGUI_API bool          BeginPopupEx(ImGuiID id, ImGuiWindowFlags extra_flags);
     IMGUI_API void          BeginTooltipEx(ImGuiWindowFlags extra_flags, bool override_previous_tooltip = true);
     IMGUI_API ImGuiWindow*  GetFrontMostPopupModal();
@@ -1249,12 +1377,24 @@ namespace ImGui
     IMGUI_API void          EndColumns();                                                             // close columns
     IMGUI_API void          PushColumnClipRect(int column_index = -1);
 
+    // Tab Bars
+    IMGUI_API bool          BeginTabBarEx(ImGuiTabBar* tab_bar, const ImRect& bb, ImGuiTabBarFlags flags);
+    IMGUI_API ImGuiTabItem* TabBarFindTabByID(ImGuiTabBar* tab_bar, ImGuiID tab_id);
+    IMGUI_API void          TabBarRemoveTab(ImGuiTabBar* tab_bar, ImGuiID tab_id);
+    IMGUI_API void          TabBarCloseTab(ImGuiTabBar* tab_bar, ImGuiTabItem* tab);
+    IMGUI_API void          TabBarQueueChangeTabOrder(ImGuiTabBar* tab_bar, const ImGuiTabItem* tab, int dir);
+    IMGUI_API bool          TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open, ImGuiTabItemFlags flags);
+    IMGUI_API ImVec2        TabItemCalcSize(const char* label, bool has_close_button);
+    IMGUI_API void          TabItemBackground(ImDrawList* draw_list, const ImRect& bb, ImGuiTabItemFlags flags, ImU32 col);
+    IMGUI_API bool          TabItemLabelAndCloseButton(ImDrawList* draw_list, const ImRect& bb, ImGuiTabItemFlags flags, const char* label, ImGuiID tab_id, ImGuiID close_button_id);
+
     // Render helpers
     // AVOID USING OUTSIDE OF IMGUI.CPP! NOT FOR PUBLIC CONSUMPTION. THOSE FUNCTIONS ARE A MESS. THEIR SIGNATURE AND BEHAVIOR WILL CHANGE, THEY NEED TO BE REFACTORED INTO SOMETHING DECENT.
     // NB: All position are in absolute pixels coordinates (we are never using window coordinates internally)
     IMGUI_API void          RenderText(ImVec2 pos, const char* text, const char* text_end = NULL, bool hide_text_after_hash = true);
     IMGUI_API void          RenderTextWrapped(ImVec2 pos, const char* text, const char* text_end, float wrap_width);
     IMGUI_API void          RenderTextClipped(const ImVec2& pos_min, const ImVec2& pos_max, const char* text, const char* text_end, const ImVec2* text_size_if_known, const ImVec2& align = ImVec2(0,0), const ImRect* clip_rect = NULL);
+    IMGUI_API void          RenderTextClippedEx(ImDrawList* draw_list, const ImVec2& pos_min, const ImVec2& pos_max, const char* text, const char* text_end, const ImVec2* text_size_if_known, const ImVec2& align = ImVec2(0, 0), const ImRect* clip_rect = NULL);
     IMGUI_API void          RenderFrame(ImVec2 p_min, ImVec2 p_max, ImU32 fill_col, bool border = true, float rounding = 0.0f);
     IMGUI_API void          RenderFrameBorder(ImVec2 p_min, ImVec2 p_max, float rounding = 0.0f);
     IMGUI_API void          RenderColorRectWithAlphaCheckerboard(ImVec2 p_min, ImVec2 p_max, ImU32 fill_col, float grid_step, ImVec2 grid_off, float rounding = 0.0f, int rounding_corners_flags = ~0);
@@ -1269,6 +1409,7 @@ namespace ImGui
     IMGUI_API void          RenderMouseCursor(ImDrawList* draw_list, ImVec2 pos, float scale, ImGuiMouseCursor mouse_cursor = ImGuiMouseCursor_Arrow);
     IMGUI_API void          RenderArrowPointingAt(ImDrawList* draw_list, ImVec2 pos, ImVec2 half_sz, ImGuiDir direction, ImU32 col);
     IMGUI_API void          RenderRectFilledRangeH(ImDrawList* draw_list, const ImRect& rect, ImU32 col, float x_start_norm, float x_end_norm, float rounding);
+    IMGUI_API void          RenderPixelEllipsis(ImDrawList* draw_list, ImVec2 pos, int count, ImU32 col);
 
     // Widgets
     IMGUI_API bool          ButtonEx(const char* label, const ImVec2& size_arg = ImVec2(0,0), ImGuiButtonFlags flags = 0);
@@ -1317,11 +1458,23 @@ namespace ImGui
 IMGUI_API bool              ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas);
 IMGUI_API void              ImFontAtlasBuildRegisterDefaultCustomRects(ImFontAtlas* atlas);
 IMGUI_API void              ImFontAtlasBuildSetupFont(ImFontAtlas* atlas, ImFont* font, ImFontConfig* font_config, float ascent, float descent);
-IMGUI_API void              ImFontAtlasBuildPackCustomRects(ImFontAtlas* atlas, void* spc);
+IMGUI_API void              ImFontAtlasBuildPackCustomRects(ImFontAtlas* atlas, void* stbrp_context_opaque);
 IMGUI_API void              ImFontAtlasBuildFinish(ImFontAtlas* atlas);
 IMGUI_API void              ImFontAtlasBuildMultiplyCalcLookupTable(unsigned char out_table[256], float in_multiply_factor);
 IMGUI_API void              ImFontAtlasBuildMultiplyRectAlpha8(const unsigned char table[256], unsigned char* pixels, int x, int y, int w, int h, int stride);
 
+// Test engine hooks (imgui-test)
+//#define IMGUI_ENABLE_TEST_ENGINE
+#ifdef IMGUI_ENABLE_TEST_ENGINE
+extern void                 ImGuiTestEngineHook_PreNewFrame(ImGuiContext* ctx);
+extern void                 ImGuiTestEngineHook_PostNewFrame(ImGuiContext* ctx);
+extern void                 ImGuiTestEngineHook_ItemAdd(ImGuiContext* ctx, const ImRect& bb, ImGuiID id);
+extern void                 ImGuiTestEngineHook_ItemInfo(ImGuiContext* ctx, ImGuiID id, const char* label, int flags);
+#define IMGUI_TEST_ENGINE_ITEM_INFO(_ID, _LABEL, _FLAGS)  ImGuiTestEngineHook_ItemInfo(&g, _ID, _LABEL, _FLAGS)   // Register status flags
+#else
+#define IMGUI_TEST_ENGINE_ITEM_INFO(_ID, _LABEL, _FLAGS)  do { } while (0)
+#endif
+
 #ifdef __clang__
 #pragma clang diagnostic pop
 #endif

misc/fonts/README.txt

@@ -119,8 +119,8 @@ Mind the fact that some graphics drivers have texture size limitation.
 If you are building a PC application, mind the fact that your users may use hardware with lower limitations than yours.
 Some solutions:
 
- - 1) Reduce glyphs ranges by calculating them from source localization data. You can use ImFont::GlyphRangesBuilder for this purpose,
-   this will be the biggest win. 
+ - 1) Reduce glyphs ranges by calculating them from source localization data. 
+   You can use ImFontGlyphRangesBuilder for this purpose, this will be the biggest win!
  - 2) You may reduce oversampling, e.g. config.OversampleH = config.OversampleV = 1, this will largely reduce your texture size.
  - 3) Set io.Fonts.TexDesiredWidth to specify a texture width to minimize texture height (see comment in ImFontAtlas::Build function).
  - 4) Set io.Fonts.Flags |= ImFontAtlasFlags_NoPowerOfTwoHeight; to disable rounding the texture height to the next power of two.
@@ -177,11 +177,11 @@ Also note that correct sRGB space blending will have an important effect on your
  BUILDING CUSTOM GLYPH RANGES
 ---------------------------------------
 
-You can use the ImFontAtlas::GlyphRangesBuilder helper to create glyph ranges based on text input.
+You can use the ImFontGlyphRangesBuilder helper to create glyph ranges based on text input.
 For example: for a game where your script is known, if you can feed your entire script to it and only build the characters the game needs. 
 
   ImVector<ImWchar> ranges;
-  ImFontAtlas::GlyphRangesBuilder builder;
+  ImFontGlyphRangesBuilder builder;
   builder.AddText("Hello world");                        // Add a string (here "Hello world" contains 7 unique characters)
   builder.AddChar(0x7262);                               // Add a specific character
   builder.AddRanges(io.Fonts->GetGlyphRangesJapanese()); // Add one of the default ranges

misc/freetype/README.md

@@ -1,14 +1,14 @@
 # imgui_freetype
 
-This is an attempt to replace stb_truetype (the default imgui's font rasterizer) with FreeType. 
-Currently not optimal and probably has some limitations or bugs.
-By [Vuhdo](https://github.com/Vuhdo) (Aleksei Skriabin). Improvements by @mikesart. Maintained by @ocornut.
+Build font atlases using FreeType instead of stb_truetype (the default imgui's font rasterizer).
+<br>by @vuhdo, @mikesart, @ocornut.
 
-**Usage**
-1. Get latest FreeType binaries or build yourself.
+### Usage
+
+1. Get latest FreeType binaries or build yourself (under Windows you may use vcpkg with `vcpkg install freetype`).
 2. Add imgui_freetype.h/cpp alongside your imgui sources.
 3. Include imgui_freetype.h after imgui.h.
-4. Call ImGuiFreeType::BuildFontAtlas() *BEFORE* calling ImFontAtlas::GetTexDataAsRGBA32() or ImFontAtlas::Build() (so normal Build() won't be called):
+4. Call `ImGuiFreeType::BuildFontAtlas()` *BEFORE* calling `ImFontAtlas::GetTexDataAsRGBA32()` or `ImFontAtlas::Build()` (so normal Build() won't be called):
 
 ```cpp
 // See ImGuiFreeType::RasterizationFlags
@@ -17,13 +17,14 @@ ImGuiFreeType::BuildFontAtlas(io.Fonts, flags);
 io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
 ```
 
-**Gamma Correct Blending**
+### Gamma Correct Blending
+
 FreeType assumes blending in linear space rather than gamma space.
 See FreeType note for [FT_Render_Glyph](https://www.freetype.org/freetype2/docs/reference/ft2-base_interface.html#FT_Render_Glyph).
 For correct results you need to be using sRGB and convert to linear space in the pixel shader output.
 The default imgui styles will be impacted by this change (alpha values will need tweaking).
 
-**Test code Usage**
+### Test code Usage
 ```cpp
 #include "misc/freetype/imgui_freetype.h"
 #include "misc/freetype/imgui_freetype.cpp"
@@ -42,16 +43,15 @@ while (true)
    if (freetype_test.UpdateRebuild())
    {
       // REUPLOAD FONT TEXTURE TO GPU
-      // e.g ImGui_ImplGlfwGL3_InvalidateDeviceObjects() + ImGui_ImplGlfwGL3_CreateDeviceObjects()
+      // e.g ImGui_ImplOpenGL3_DestroyDeviceObjects() + ImGui_ImplOpenGL3_CreateDeviceObjects()
    }
    ImGui::NewFrame();
    freetype_test.ShowFreetypeOptionsWindow();
    ...
 }
-}
 ```
 
-**Test code**
+### Test code
 ```cpp
 #include "misc/freetype/imgui_freetype.h"
 #include "misc/freetype/imgui_freetype.cpp"
@@ -61,7 +61,7 @@ struct FreeTypeTest
     enum FontBuildMode
     {
         FontBuildMode_FreeType,
-        FontBuildMode_Stb,
+        FontBuildMode_Stb
     };
 
     FontBuildMode BuildMode;
@@ -120,14 +120,7 @@ struct FreeTypeTest
 };
 ```
 
-**Known issues**
-- Output texture has excessive resolution (lots of vertical waste).
+### Known issues
 - FreeType's memory allocator is not overridden.
 - `cfg.OversampleH`, `OversampleV` are ignored (but perhaps not so necessary with this rasterizer).
 
-**Obligatory comparison screenshots**
-
-Using Windows built-in segoeui.ttf font. Open in new browser tabs, view at 1080p+.
-
-![freetype rasterizer](https://raw.githubusercontent.com/wiki/ocornut/imgui_club/images/freetype_20170817.png)
-

misc/freetype/imgui_freetype.cpp

@@ -1,6 +1,6 @@
-// Wrapper to use Freetype (instead of stb_truetype) for Dear ImGui
+// Wrapper to use FreeType (instead of stb_truetype) for Dear ImGui
 // Get latest version at https://github.com/ocornut/imgui/tree/master/misc/freetype
-// Original code by @Vuhdo (Aleksei Skriabin). Improvements by @mikesart. Maintained by @ocornut
+// Original code by @vuhdo (Aleksei Skriabin). Improvements by @mikesart. Maintained and v0.60+ by @ocornut.
 
 // Changelog:
 // - v0.50: (2017/08/16) imported from https://github.com/Vuhdo/imgui_freetype into http://www.github.com/ocornut/imgui_club, updated for latest changes in ImFontAtlas, minor tweaks.
@@ -10,6 +10,7 @@
 // - v0.54: (2018/01/22) fix for addition of ImFontAtlas::TexUvscale member
 // - v0.55: (2018/02/04) moved to main imgui repository (away from http://www.github.com/ocornut/imgui_club)
 // - v0.56: (2018/06/08) added support for ImFontConfig::GlyphMinAdvanceX, GlyphMaxAdvanceX
+// - v0.60: (2019/01/10) re-factored to match big update in STB builder. fixed texture height waste. fixed redundant glyphs when merging. support for glyph padding.
 
 // Gamma Correct Blending:
 //  FreeType assumes blending in linear space rather than gamma space.
@@ -17,18 +18,16 @@
 //  For correct results you need to be using sRGB and convert to linear space in the pixel shader output.
 //  The default imgui styles will be impacted by this change (alpha values will need tweaking).
 
-// TODO:
-// - Output texture has excessive resolution (lots of vertical waste).
-// - FreeType's memory allocator is not overridden.
-// - cfg.OversampleH, OversampleV are ignored (but perhaps not so necessary with this rasterizer).
+// FIXME: FreeType's memory allocator is not overridden.
+// FIXME: cfg.OversampleH, OversampleV are not supported (but perhaps not so necessary with this rasterizer).
 
 #include "imgui_freetype.h"
 #include "imgui_internal.h"     // ImMin,ImMax,ImFontAtlasBuild*,
 #include <stdint.h>
 #include <ft2build.h>
-#include FT_FREETYPE_H
-#include FT_GLYPH_H
-#include FT_SYNTHESIS_H
+#include FT_FREETYPE_H          // <freetype/freetype.h>
+#include FT_GLYPH_H             // <freetype/ftglyph.h>
+#include FT_SYNTHESIS_H         // <freetype/ftsynth.h>
 
 #ifdef _MSC_VER
 #pragma warning (disable: 4505) // unreferenced local function has been removed (stb stuff)
@@ -74,10 +73,10 @@ namespace
     /// A structure that describe a glyph.
     struct GlyphInfo 
     {
-        float Width;		// Glyph's width in pixels.
-        float Height;		// Glyph's height in pixels.
-        float OffsetX;		// The distance from the origin ("pen position") to the left of the glyph.
-        float OffsetY;		// The distance from the origin to the top of the glyph. This is usually a value < 0.
+        int         Width;              // Glyph's width in pixels.
+        int         Height;             // Glyph's height in pixels.
+        FT_Int      OffsetX;            // The distance from the origin ("pen position") to the left of the glyph.
+        FT_Int      OffsetY;            // The distance from the origin to the top of the glyph. This is usually a value < 0.
         float       AdvanceX;           // The distance from the origin to the origin of the next glyph. This is usually a value > 0.
     };
 
@@ -96,82 +95,80 @@ namespace
     // NB: No ctor/dtor, explicitly call Init()/Shutdown()
     struct FreeTypeFont
     {
-        bool        Init(const ImFontConfig& cfg, unsigned int extra_user_flags);   // Initialize from an external data buffer. Doesn't copy data, and you must ensure it stays valid up to this object lifetime.
-        void        Shutdown();
+        bool                    InitFont(FT_Library ft_library, const ImFontConfig& cfg, unsigned int extra_user_flags); // Initialize from an external data buffer. Doesn't copy data, and you must ensure it stays valid up to this object lifetime.
+        void                    CloseFont();
         void                    SetPixelHeight(int pixel_height); // Change font pixel size. All following calls to RasterizeGlyph() will use this size
-
-        bool        CalcGlyphInfo(uint32_t codepoint, GlyphInfo& glyph_info, FT_Glyph& ft_glyph, FT_BitmapGlyph& ft_bitmap);
-        void        BlitGlyph(FT_BitmapGlyph ft_bitmap, uint8_t* dst, uint32_t dst_pitch, unsigned char* multiply_table = NULL);
+        const FT_Glyph_Metrics* LoadGlyph(uint32_t in_codepoint);
+        const FT_Bitmap*        RenderGlyphAndGetInfo(GlyphInfo* out_glyph_info);
+        void                    BlitGlyph(const FT_Bitmap* ft_bitmap, uint8_t* dst, uint32_t dst_pitch, unsigned char* multiply_table = NULL);
+        ~FreeTypeFont()         { CloseFont(); }
 
         // [Internals]
         FontInfo        Info;               // Font descriptor of the current font.
+        FT_Face         Face;
         unsigned int    UserFlags;          // = ImFontConfig::RasterizerFlags
-        FT_Library      FreetypeLibrary;
-        FT_Face         FreetypeFace;
-        FT_Int32        FreetypeLoadFlags;
+        FT_Int32        LoadFlags;
     };
 
     // From SDL_ttf: Handy routines for converting from fixed point
     #define FT_CEIL(X)  (((X + 63) & -64) / 64)
 
-    bool FreeTypeFont::Init(const ImFontConfig& cfg, unsigned int extra_user_flags)
+    bool FreeTypeFont::InitFont(FT_Library ft_library, const ImFontConfig& cfg, unsigned int extra_user_flags)
     {
         // FIXME: substitute allocator
-        FT_Error error = FT_Init_FreeType(&FreetypeLibrary);
+        FT_Error error = FT_New_Memory_Face(ft_library, (uint8_t*)cfg.FontData, (uint32_t)cfg.FontDataSize, (uint32_t)cfg.FontNo, &Face);
         if (error != 0)
             return false;
-        error = FT_New_Memory_Face(FreetypeLibrary, (uint8_t*)cfg.FontData, (uint32_t)cfg.FontDataSize, (uint32_t)cfg.FontNo, &FreetypeFace);
-        if (error != 0)
-            return false;
-        error = FT_Select_Charmap(FreetypeFace, FT_ENCODING_UNICODE);
+        error = FT_Select_Charmap(Face, FT_ENCODING_UNICODE);
         if (error != 0)
             return false;
 
         memset(&Info, 0, sizeof(Info));
         SetPixelHeight((uint32_t)cfg.SizePixels);
 
-        // Convert to freetype flags (nb: Bold and Oblique are processed separately)
+        // Convert to FreeType flags (NB: Bold and Oblique are processed separately)
         UserFlags = cfg.RasterizerFlags | extra_user_flags;
-        FreetypeLoadFlags = FT_LOAD_NO_BITMAP;
-        if (UserFlags & ImGuiFreeType::NoHinting)      FreetypeLoadFlags |= FT_LOAD_NO_HINTING;
-        if (UserFlags & ImGuiFreeType::NoAutoHint)     FreetypeLoadFlags |= FT_LOAD_NO_AUTOHINT;
-        if (UserFlags & ImGuiFreeType::ForceAutoHint)  FreetypeLoadFlags |= FT_LOAD_FORCE_AUTOHINT;
+        LoadFlags = FT_LOAD_NO_BITMAP;
+        if (UserFlags & ImGuiFreeType::NoHinting)
+            LoadFlags |= FT_LOAD_NO_HINTING;
+        if (UserFlags & ImGuiFreeType::NoAutoHint)
+            LoadFlags |= FT_LOAD_NO_AUTOHINT;
+        if (UserFlags & ImGuiFreeType::ForceAutoHint)
+            LoadFlags |= FT_LOAD_FORCE_AUTOHINT;
         if (UserFlags & ImGuiFreeType::LightHinting)
-            FreetypeLoadFlags |= FT_LOAD_TARGET_LIGHT;
+            LoadFlags |= FT_LOAD_TARGET_LIGHT;
         else if (UserFlags & ImGuiFreeType::MonoHinting)
-            FreetypeLoadFlags |= FT_LOAD_TARGET_MONO;
+            LoadFlags |= FT_LOAD_TARGET_MONO;
         else                                                
-            FreetypeLoadFlags |= FT_LOAD_TARGET_NORMAL;
+            LoadFlags |= FT_LOAD_TARGET_NORMAL;
 
         return true;
     }
 
-    void FreeTypeFont::Shutdown()
+    void FreeTypeFont::CloseFont()
     {
-        if (FreetypeFace) 
+        if (Face) 
         {
-            FT_Done_Face(FreetypeFace);
-            FreetypeFace = NULL;
-            FT_Done_FreeType(FreetypeLibrary);
-            FreetypeLibrary = NULL;
+            FT_Done_Face(Face);
+            Face = NULL;
         }
     }
 
     void FreeTypeFont::SetPixelHeight(int pixel_height) 
     {
-        // I'm not sure how to deal with font sizes properly.
-        // As far as I understand, currently ImGui assumes that the 'pixel_height' is a maximum height of an any given glyph,
-        // i.e. it's the sum of font's ascender and descender. Seems strange to me.
+        // Vuhdo: I'm not sure how to deal with font sizes properly. As far as I understand, currently ImGui assumes that the 'pixel_height' 
+        // is a maximum height of an any given glyph, i.e. it's the sum of font's ascender and descender. Seems strange to me.
+        // NB: FT_Set_Pixel_Sizes() doesn't seem to get us the same result.
         FT_Size_RequestRec req;
         req.type = FT_SIZE_REQUEST_TYPE_REAL_DIM;
         req.width = 0;
         req.height = (uint32_t)pixel_height * 64;
         req.horiResolution = 0;
         req.vertResolution = 0;
-        FT_Request_Size(FreetypeFace, &req);
+        FT_Request_Size(Face, &req);
 
-        // update font info
-        FT_Size_Metrics metrics = FreetypeFace->size->metrics;
+        // Update font info
+        FT_Size_Metrics metrics = Face->size->metrics;
         Info.PixelHeight = (uint32_t)pixel_height;
         Info.Ascender = (float)FT_CEIL(metrics.ascender);
         Info.Descender = (float)FT_CEIL(metrics.descender);
@@ -180,52 +177,58 @@ namespace
         Info.MaxAdvanceWidth = (float)FT_CEIL(metrics.max_advance);
     }
 
-    bool FreeTypeFont::CalcGlyphInfo(uint32_t codepoint, GlyphInfo &glyph_info, FT_Glyph& ft_glyph, FT_BitmapGlyph& ft_bitmap)
+    const FT_Glyph_Metrics* FreeTypeFont::LoadGlyph(uint32_t codepoint)
     {
-        uint32_t glyph_index = FT_Get_Char_Index(FreetypeFace, codepoint);
+        uint32_t glyph_index = FT_Get_Char_Index(Face, codepoint);
         if (glyph_index == 0)
-            return false;
-        FT_Error error = FT_Load_Glyph(FreetypeFace, glyph_index, FreetypeLoadFlags);
+            return NULL;
+        FT_Error error = FT_Load_Glyph(Face, glyph_index, LoadFlags);
         if (error)
-            return false;
+            return NULL;
 
         // Need an outline for this to work
-        FT_GlyphSlot slot = FreetypeFace->glyph;
+        FT_GlyphSlot slot = Face->glyph;
         IM_ASSERT(slot->format == FT_GLYPH_FORMAT_OUTLINE);
 
+        // Apply convenience transform (this is not picking from real "Bold"/"Italic" fonts! Merely applying FreeType helper transform. Oblique == Slanting)
         if (UserFlags & ImGuiFreeType::Bold)
             FT_GlyphSlot_Embolden(slot);
         if (UserFlags & ImGuiFreeType::Oblique)
+        {
             FT_GlyphSlot_Oblique(slot);
-
-        // Retrieve the glyph
-        error = FT_Get_Glyph(slot, &ft_glyph);
-        if (error != 0)
-            return false;
-
-        // Rasterize
-        error = FT_Glyph_To_Bitmap(&ft_glyph, FT_RENDER_MODE_NORMAL, NULL, true);
-        if (error != 0)
-            return false;
-
-        ft_bitmap = (FT_BitmapGlyph)ft_glyph;
-        glyph_info.AdvanceX = (float)FT_CEIL(slot->advance.x);
-        glyph_info.OffsetX = (float)ft_bitmap->left;
-        glyph_info.OffsetY = -(float)ft_bitmap->top;
-        glyph_info.Width = (float)ft_bitmap->bitmap.width;
-        glyph_info.Height = (float)ft_bitmap->bitmap.rows;
-
-        return true;
+            //FT_BBox bbox;
+            //FT_Outline_Get_BBox(&slot->outline, &bbox);
+            //slot->metrics.width = bbox.xMax - bbox.xMin;
+            //slot->metrics.height = bbox.yMax - bbox.yMin;
         }
 
-    void FreeTypeFont::BlitGlyph(FT_BitmapGlyph ft_bitmap, uint8_t* dst, uint32_t dst_pitch, unsigned char* multiply_table)
+        return &slot->metrics;
+    }
+
+    const FT_Bitmap* FreeTypeFont::RenderGlyphAndGetInfo(GlyphInfo* out_glyph_info)
+    {
+        FT_GlyphSlot slot = Face->glyph;
+        FT_Error error = FT_Render_Glyph(slot, FT_RENDER_MODE_NORMAL);
+        if (error != 0)
+            return NULL;
+
+        FT_Bitmap* ft_bitmap = &Face->glyph->bitmap;
+        out_glyph_info->Width = (int)ft_bitmap->width;
+        out_glyph_info->Height = (int)ft_bitmap->rows;
+        out_glyph_info->OffsetX = Face->glyph->bitmap_left;
+        out_glyph_info->OffsetY = -Face->glyph->bitmap_top;
+        out_glyph_info->AdvanceX = (float)FT_CEIL(slot->advance.x);
+
+        return ft_bitmap;
+    }
+
+    void FreeTypeFont::BlitGlyph(const FT_Bitmap* ft_bitmap, uint8_t* dst, uint32_t dst_pitch, unsigned char* multiply_table)
     {
         IM_ASSERT(ft_bitmap != NULL);
-
-        const uint32_t w = ft_bitmap->bitmap.width;
-        const uint32_t h = ft_bitmap->bitmap.rows;
-        const uint8_t* src = ft_bitmap->bitmap.buffer;
-        const uint32_t src_pitch = ft_bitmap->bitmap.pitch;
+        const uint32_t w = ft_bitmap->width;
+        const uint32_t h = ft_bitmap->rows;
+        const uint8_t* src = ft_bitmap->buffer;
+        const uint32_t src_pitch = ft_bitmap->pitch;
 
         if (multiply_table == NULL)
         {
@@ -246,143 +249,332 @@ namespace
 #define STB_RECT_PACK_IMPLEMENTATION
 #include "imstb_rectpack.h"
 
-bool ImGuiFreeType::BuildFontAtlas(ImFontAtlas* atlas, unsigned int extra_flags)
+struct ImFontBuildSrcGlyphFT
+{
+    GlyphInfo           Info;
+    uint32_t            Codepoint;
+    unsigned char*      BitmapData;         // Point within one of the dst_tmp_bitmap_buffers[] array
+};
+
+struct ImFontBuildSrcDataFT
+{
+    FreeTypeFont        Font;
+    stbrp_rect*         Rects;              // Rectangle to pack. We first fill in their size and the packer will give us their position.
+    const ImWchar*      SrcRanges;          // Ranges as requested by user (user is allowed to request too much, e.g. 0x0020..0xFFFF)
+    int                 DstIndex;           // Index into atlas->Fonts[] and dst_tmp_array[]
+    int                 GlyphsHighest;      // Highest requested codepoint
+    int                 GlyphsCount;        // Glyph count (excluding missing glyphs and glyphs already set by an earlier source font)
+    ImBoolVector        GlyphsSet;          // Glyph bit map (random access, 1-bit per codepoint. This will be a maximum of 8KB)
+    ImVector<ImFontBuildSrcGlyphFT>   GlyphsList;
+};
+
+// Temporary data for one destination ImFont* (multiple source fonts can be merged into one destination ImFont)
+struct ImFontBuildDstDataFT
+{
+    int                 SrcCount;           // Number of source fonts targeting this destination font.
+    int                 GlyphsHighest;
+    int                 GlyphsCount;
+    ImBoolVector        GlyphsSet;          // This is used to resolve collision when multiple sources are merged into a same destination font.
+};
+
+bool ImFontAtlasBuildWithFreeType(FT_Library ft_library, ImFontAtlas* atlas, unsigned int extra_flags)
 {
     IM_ASSERT(atlas->ConfigData.Size > 0);
-    IM_ASSERT(atlas->TexGlyphPadding == 1); // Not supported
 
     ImFontAtlasBuildRegisterDefaultCustomRects(atlas);
 
-    atlas->TexID = NULL;
+    // Clear atlas
+    atlas->TexID = (ImTextureID)NULL;
     atlas->TexWidth = atlas->TexHeight = 0;
     atlas->TexUvScale = ImVec2(0.0f, 0.0f);
     atlas->TexUvWhitePixel = ImVec2(0.0f, 0.0f);
     atlas->ClearTexData();
 
-    ImVector<FreeTypeFont> fonts;
-    fonts.resize(atlas->ConfigData.Size);
+    // Temporary storage for building
+    ImVector<ImFontBuildSrcDataFT> src_tmp_array;
+    ImVector<ImFontBuildDstDataFT> dst_tmp_array;
+    src_tmp_array.resize(atlas->ConfigData.Size);
+    dst_tmp_array.resize(atlas->Fonts.Size);
+    memset(src_tmp_array.Data, 0, (size_t)src_tmp_array.size_in_bytes());
+    memset(dst_tmp_array.Data, 0, (size_t)dst_tmp_array.size_in_bytes());
 
-    ImVec2 max_glyph_size(1.0f, 1.0f);
-
-    // Count glyphs/ranges, initialize font
-    int total_glyphs_count = 0;
-    int total_ranges_count = 0;
-    for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++) 
+    // 1. Initialize font loading structure, check font data validity
+    for (int src_i = 0; src_i < atlas->ConfigData.Size; src_i++)
     {
-        ImFontConfig& cfg = atlas->ConfigData[input_i];
-        FreeTypeFont& font_face = fonts[input_i];
+        ImFontBuildSrcDataFT& src_tmp = src_tmp_array[src_i];
+        ImFontConfig& cfg = atlas->ConfigData[src_i];
+        FreeTypeFont& font_face = src_tmp.Font;
         IM_ASSERT(cfg.DstFont && (!cfg.DstFont->IsLoaded() || cfg.DstFont->ContainerAtlas == atlas));
 
-        if (!font_face.Init(cfg, extra_flags))
+        // Find index from cfg.DstFont (we allow the user to set cfg.DstFont. Also it makes casual debugging nicer than when storing indices)
+        src_tmp.DstIndex = -1;
+        for (int output_i = 0; output_i < atlas->Fonts.Size && src_tmp.DstIndex == -1; output_i++)
+            if (cfg.DstFont == atlas->Fonts[output_i])
+                src_tmp.DstIndex = output_i;
+        IM_ASSERT(src_tmp.DstIndex != -1); // cfg.DstFont not pointing within atlas->Fonts[] array?
+        if (src_tmp.DstIndex == -1)
             return false;
 
-        max_glyph_size.x = ImMax(max_glyph_size.x, font_face.Info.MaxAdvanceWidth);
-        max_glyph_size.y = ImMax(max_glyph_size.y, font_face.Info.Ascender - font_face.Info.Descender);
+        // Load font
+        if (!font_face.InitFont(ft_library, cfg, extra_flags))
+            return false;
 
-        if (!cfg.GlyphRanges)
-            cfg.GlyphRanges = atlas->GetGlyphRangesDefault();
-        for (const ImWchar* in_range = cfg.GlyphRanges; in_range[0] && in_range[ 1 ]; in_range += 2, total_ranges_count++) 
-            total_glyphs_count += (in_range[1] - in_range[0]) + 1;
+        // Measure highest codepoints
+        ImFontBuildDstDataFT& dst_tmp = dst_tmp_array[src_tmp.DstIndex];
+        src_tmp.SrcRanges = cfg.GlyphRanges ? cfg.GlyphRanges : atlas->GetGlyphRangesDefault();
+        for (const ImWchar* src_range = src_tmp.SrcRanges; src_range[0] && src_range[1]; src_range += 2)
+            src_tmp.GlyphsHighest = ImMax(src_tmp.GlyphsHighest, (int)src_range[1]);
+        dst_tmp.SrcCount++;
+        dst_tmp.GlyphsHighest = ImMax(dst_tmp.GlyphsHighest, src_tmp.GlyphsHighest);
     }
 
-    // We need a width for the skyline algorithm. Using a dumb heuristic here to decide of width. User can override TexDesiredWidth and TexGlyphPadding if they wish.
-    // Width doesn't really matter much, but some API/GPU have texture size limitations and increasing width can decrease height.
-    atlas->TexWidth = (atlas->TexDesiredWidth > 0) ? atlas->TexDesiredWidth : (total_glyphs_count > 4000) ? 4096 : (total_glyphs_count > 2000) ? 2048 : (total_glyphs_count > 1000) ? 1024 : 512;
+    // 2. For every requested codepoint, check for their presence in the font data, and handle redundancy or overlaps between source fonts to avoid unused glyphs.
+    int total_glyphs_count = 0;
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
+    {
+        ImFontBuildSrcDataFT& src_tmp = src_tmp_array[src_i];
+        ImFontBuildDstDataFT& dst_tmp = dst_tmp_array[src_tmp.DstIndex];
+        ImFontConfig& cfg = atlas->ConfigData[src_i];
+        src_tmp.GlyphsSet.Resize(src_tmp.GlyphsHighest + 1);
+        if (dst_tmp.SrcCount > 1 && dst_tmp.GlyphsSet.Storage.empty())
+            dst_tmp.GlyphsSet.Resize(dst_tmp.GlyphsHighest + 1);
 
-    // We don't do the original first pass to determine texture height, but just rough estimate.
-    // Looks ugly inaccurate and excessive, but AFAIK with FreeType we actually need to render glyphs to get exact sizes.
-    // Alternatively, we could just render all glyphs into a big shadow buffer, get their sizes, do the rectangle packing and just copy back from the 
-    // shadow buffer to the texture buffer. Will give us an accurate texture height, but eat a lot of temp memory. Probably no one will notice.)
-    const int total_rects = total_glyphs_count + atlas->CustomRects.size();
-    float min_rects_per_row = ceilf((atlas->TexWidth / (max_glyph_size.x + 1.0f)));
-    float min_rects_per_column = ceilf(total_rects / min_rects_per_row);
-    atlas->TexHeight = (int)(min_rects_per_column * (max_glyph_size.y + 1.0f));
+        for (const ImWchar* src_range = src_tmp.SrcRanges; src_range[0] && src_range[1]; src_range += 2)
+            for (int codepoint = src_range[0]; codepoint <= src_range[1]; codepoint++)
+            {
+                if (cfg.MergeMode && dst_tmp.GlyphsSet.GetBit(codepoint))               // Don't overwrite existing glyphs. We could make this an option (e.g. MergeOverwrite)
+                    continue;
+                uint32_t glyph_index = FT_Get_Char_Index(src_tmp.Font.Face, codepoint); // It is actually in the font? (FIXME-OPT: We are not storing the glyph_index..)
+                if (glyph_index == 0)
+                    continue;
 
-    // Create texture
+                // Add to avail set/counters
+                src_tmp.GlyphsCount++;
+                dst_tmp.GlyphsCount++;
+                src_tmp.GlyphsSet.SetBit(codepoint, true);
+                if (dst_tmp.SrcCount > 1)
+                    dst_tmp.GlyphsSet.SetBit(codepoint, true);
+                total_glyphs_count++;
+            }
+    }
+
+    // 3. Unpack our bit map into a flat list (we now have all the Unicode points that we know are requested _and_ available _and_ not overlapping another)
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
+    {
+        ImFontBuildSrcDataFT& src_tmp = src_tmp_array[src_i];
+        src_tmp.GlyphsList.reserve(src_tmp.GlyphsCount);
+
+        IM_ASSERT(sizeof(src_tmp.GlyphsSet.Storage.Data[0]) == sizeof(int));
+        const int* it_begin = src_tmp.GlyphsSet.Storage.begin();
+        const int* it_end = src_tmp.GlyphsSet.Storage.end();
+        for (const int* it = it_begin; it < it_end; it++)
+            if (int entries_32 = *it)
+                for (int bit_n = 0; bit_n < 32; bit_n++)
+                    if (entries_32 & (1 << bit_n))
+                    {
+                        ImFontBuildSrcGlyphFT src_glyph;
+                        memset(&src_glyph, 0, sizeof(src_glyph));
+                        src_glyph.Codepoint = (ImWchar)(((it - it_begin) << 5) + bit_n);
+                        //src_glyph.GlyphIndex = 0; // FIXME-OPT: We had this info in the previous step and lost it..
+                        src_tmp.GlyphsList.push_back(src_glyph);
+                    }
+        src_tmp.GlyphsSet.Clear();
+        IM_ASSERT(src_tmp.GlyphsList.Size == src_tmp.GlyphsCount);
+    }
+    for (int dst_i = 0; dst_i < dst_tmp_array.Size; dst_i++)
+        dst_tmp_array[dst_i].GlyphsSet.Clear();
+    dst_tmp_array.clear();
+
+    // Allocate packing character data and flag packed characters buffer as non-packed (x0=y0=x1=y1=0)
+    // (We technically don't need to zero-clear buf_rects, but let's do it for the sake of sanity)
+    ImVector<stbrp_rect> buf_rects;
+    buf_rects.resize(total_glyphs_count);
+    memset(buf_rects.Data, 0, (size_t)buf_rects.size_in_bytes());
+
+    // Allocate temporary rasterization data buffers. 
+    // We could not find a way to retrieve accurate glyph size without rendering them.
+    // (e.g. slot->metrics->width not always matching bitmap->width, especially considering the Oblique transform)
+    // We allocate in chunks of 256 KB to not waste too much extra memory ahead. Hopefully users of FreeType won't find the temporary allocations.
+    const int BITMAP_BUFFERS_CHUNK_SIZE = 256 * 1024;
+    int buf_bitmap_current_used_bytes = 0;
+    ImVector<unsigned char*> buf_bitmap_buffers;
+    buf_bitmap_buffers.push_back((unsigned char*)ImGui::MemAlloc(BITMAP_BUFFERS_CHUNK_SIZE));
+
+    // 4. Gather glyphs sizes so we can pack them in our virtual canvas.
+    // 8. Render/rasterize font characters into the texture
+    int total_surface = 0;
+    int buf_rects_out_n = 0;
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
+    {
+        ImFontBuildSrcDataFT& src_tmp = src_tmp_array[src_i];
+        ImFontConfig& cfg = atlas->ConfigData[src_i];
+        if (src_tmp.GlyphsCount == 0)
+            continue;
+
+        src_tmp.Rects = &buf_rects[buf_rects_out_n];
+        buf_rects_out_n += src_tmp.GlyphsCount;
+
+        // Compute multiply table if requested
+        const bool multiply_enabled = (cfg.RasterizerMultiply != 1.0f);
+        unsigned char multiply_table[256];
+        if (multiply_enabled)
+            ImFontAtlasBuildMultiplyCalcLookupTable(multiply_table, cfg.RasterizerMultiply);
+
+        // Gather the sizes of all rectangles we will need to pack
+        const int padding = atlas->TexGlyphPadding;
+        for (int glyph_i = 0; glyph_i < src_tmp.GlyphsList.Size; glyph_i++)
+        {
+            ImFontBuildSrcGlyphFT& src_glyph = src_tmp.GlyphsList[glyph_i];
+
+            const FT_Glyph_Metrics* metrics = src_tmp.Font.LoadGlyph(src_glyph.Codepoint);
+            IM_ASSERT(metrics != NULL);
+            if (metrics == NULL)
+                continue;
+
+            // Render glyph into a bitmap (currently held by FreeType)
+            const FT_Bitmap* ft_bitmap = src_tmp.Font.RenderGlyphAndGetInfo(&src_glyph.Info);
+            IM_ASSERT(ft_bitmap);
+
+            // Allocate new temporary chunk if needed
+            const int bitmap_size_in_bytes = src_glyph.Info.Width * src_glyph.Info.Height;
+            if (buf_bitmap_current_used_bytes + bitmap_size_in_bytes > BITMAP_BUFFERS_CHUNK_SIZE)
+            {
+                buf_bitmap_current_used_bytes = 0;
+                buf_bitmap_buffers.push_back((unsigned char*)ImGui::MemAlloc(BITMAP_BUFFERS_CHUNK_SIZE));
+            }
+
+            // Blit rasterized pixels to our temporary buffer and keep a pointer to it.
+            src_glyph.BitmapData = buf_bitmap_buffers.back() + buf_bitmap_current_used_bytes;
+            buf_bitmap_current_used_bytes += bitmap_size_in_bytes;
+            src_tmp.Font.BlitGlyph(ft_bitmap, src_glyph.BitmapData, src_glyph.Info.Width * 1, multiply_enabled ? multiply_table : NULL);
+
+            src_tmp.Rects[glyph_i].w = (stbrp_coord)(src_glyph.Info.Width + padding);
+            src_tmp.Rects[glyph_i].h = (stbrp_coord)(src_glyph.Info.Height + padding);
+            total_surface += src_tmp.Rects[glyph_i].w * src_tmp.Rects[glyph_i].h;
+        }
+    }
+
+    // We need a width for the skyline algorithm, any width!
+    // The exact width doesn't really matter much, but some API/GPU have texture size limitations and increasing width can decrease height.
+    // User can override TexDesiredWidth and TexGlyphPadding if they wish, otherwise we use a simple heuristic to select the width based on expected surface.
+    const int surface_sqrt = (int)ImSqrt((float)total_surface) + 1;
+    atlas->TexHeight = 0;
+    if (atlas->TexDesiredWidth > 0)
+        atlas->TexWidth = atlas->TexDesiredWidth;
+    else
+        atlas->TexWidth = (surface_sqrt >= 4096*0.7f) ? 4096 : (surface_sqrt >= 2048*0.7f) ? 2048 : (surface_sqrt >= 1024*0.7f) ? 1024 : 512;
+
+    // 5. Start packing
+    // Pack our extra data rectangles first, so it will be on the upper-left corner of our texture (UV will have small values).
+    const int TEX_HEIGHT_MAX = 1024 * 32;
+    const int num_nodes_for_packing_algorithm = atlas->TexWidth - atlas->TexGlyphPadding;
+    ImVector<stbrp_node> pack_nodes;
+    pack_nodes.resize(num_nodes_for_packing_algorithm);
+    stbrp_context pack_context;
+    stbrp_init_target(&pack_context, atlas->TexWidth, TEX_HEIGHT_MAX, pack_nodes.Data, pack_nodes.Size);
+    ImFontAtlasBuildPackCustomRects(atlas, &pack_context);
+
+    // 6. Pack each source font. No rendering yet, we are working with rectangles in an infinitely tall texture at this point.
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
+    {
+        ImFontBuildSrcDataFT& src_tmp = src_tmp_array[src_i];
+        if (src_tmp.GlyphsCount == 0)
+            continue;
+
+        stbrp_pack_rects(&pack_context, src_tmp.Rects, src_tmp.GlyphsCount);
+
+        // Extend texture height and mark missing glyphs as non-packed so we won't render them.
+        // FIXME: We are not handling packing failure here (would happen if we got off TEX_HEIGHT_MAX or if a single if larger than TexWidth?)
+        for (int glyph_i = 0; glyph_i < src_tmp.GlyphsCount; glyph_i++)
+            if (src_tmp.Rects[glyph_i].was_packed)
+                atlas->TexHeight = ImMax(atlas->TexHeight, src_tmp.Rects[glyph_i].y + src_tmp.Rects[glyph_i].h);
+    }
+
+    // 7. Allocate texture
     atlas->TexHeight = (atlas->Flags & ImFontAtlasFlags_NoPowerOfTwoHeight) ? (atlas->TexHeight + 1) : ImUpperPowerOfTwo(atlas->TexHeight);
     atlas->TexUvScale = ImVec2(1.0f / atlas->TexWidth, 1.0f / atlas->TexHeight);
     atlas->TexPixelsAlpha8 = (unsigned char*)ImGui::MemAlloc(atlas->TexWidth * atlas->TexHeight);
     memset(atlas->TexPixelsAlpha8, 0, atlas->TexWidth * atlas->TexHeight);
 
-    // Start packing
-    ImVector<stbrp_node> pack_nodes;
-    pack_nodes.resize(total_rects);
-    stbrp_context context;
-    stbrp_init_target(&context, atlas->TexWidth, atlas->TexHeight, pack_nodes.Data, total_rects);
-
-    // Pack our extra data rectangles first, so it will be on the upper-left corner of our texture (UV will have small values).
-    ImFontAtlasBuildPackCustomRects(atlas, &context);
-
-    // Render characters, setup ImFont and glyphs for runtime
-    for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++)
+    // 8. Copy rasterized font characters back into the main texture
+    // 9. Setup ImFont and glyphs for runtime
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
     {
-        ImFontConfig& cfg = atlas->ConfigData[input_i];
-        FreeTypeFont& font_face = fonts[input_i];
-        ImFont* dst_font = cfg.DstFont;
-        if (cfg.MergeMode)
-            dst_font->BuildLookupTable();
+        ImFontBuildSrcDataFT& src_tmp = src_tmp_array[src_i];
+        if (src_tmp.GlyphsCount == 0)
+            continue;
 
-        const float ascent = font_face.Info.Ascender;
-        const float descent = font_face.Info.Descender;
+        ImFontConfig& cfg = atlas->ConfigData[src_i];
+        ImFont* dst_font = cfg.DstFont; // We can have multiple input fonts writing into a same destination font (when using MergeMode=true)
+
+        const float ascent = src_tmp.Font.Info.Ascender;
+        const float descent = src_tmp.Font.Info.Descender;
         ImFontAtlasBuildSetupFont(atlas, dst_font, &cfg, ascent, descent);
         const float font_off_x = cfg.GlyphOffset.x;
         const float font_off_y = cfg.GlyphOffset.y + (float)(int)(dst_font->Ascent + 0.5f);
 
-        bool multiply_enabled = (cfg.RasterizerMultiply != 1.0f);
-        unsigned char multiply_table[256];
-        if (multiply_enabled)
-            ImFontAtlasBuildMultiplyCalcLookupTable(multiply_table, cfg.RasterizerMultiply);
-
-        for (const ImWchar* in_range = cfg.GlyphRanges; in_range[0] && in_range[1]; in_range += 2) 
+        const int padding = atlas->TexGlyphPadding;
+        for (int glyph_i = 0; glyph_i < src_tmp.GlyphsCount; glyph_i++)
         {
-            for (uint32_t codepoint = in_range[0]; codepoint <= in_range[1]; ++codepoint) 
-            {
-                if (cfg.MergeMode && dst_font->FindGlyphNoFallback((ImWchar)codepoint))
-                    continue;
+            ImFontBuildSrcGlyphFT& src_glyph = src_tmp.GlyphsList[glyph_i];
+            stbrp_rect& pack_rect = src_tmp.Rects[glyph_i];
+            IM_ASSERT(pack_rect.was_packed);
 
-                FT_Glyph ft_glyph = NULL;
-                FT_BitmapGlyph ft_glyph_bitmap = NULL; // NB: will point to bitmap within FT_Glyph
-                GlyphInfo glyph_info;
-                if (!font_face.CalcGlyphInfo(codepoint, glyph_info, ft_glyph, ft_glyph_bitmap))
-                    continue;
+            GlyphInfo& info = src_glyph.Info;
+            IM_ASSERT(info.Width + padding <= pack_rect.w);
+            IM_ASSERT(info.Height + padding <= pack_rect.h);
+            const int tx = pack_rect.x + padding;
+            const int ty = pack_rect.y + padding;
 
-                // Pack rectangle
-                stbrp_rect rect;
-                rect.w = (uint16_t)glyph_info.Width + 1; // Account for texture filtering
-                rect.h = (uint16_t)glyph_info.Height + 1;
-                stbrp_pack_rects(&context, &rect, 1);
+            // Blit from temporary buffer to final texture
+            size_t blit_src_stride = (size_t)src_glyph.Info.Width;
+            size_t blit_dst_stride = (size_t)atlas->TexWidth;
+            unsigned char* blit_src = src_glyph.BitmapData;
+            unsigned char* blit_dst = atlas->TexPixelsAlpha8 + (ty * blit_dst_stride) + tx;
+            for (int y = info.Height; y > 0; y--, blit_dst += blit_dst_stride, blit_src += blit_src_stride)
+                memcpy(blit_dst, blit_src, blit_src_stride);
 
-                // Copy rasterized pixels to main texture
-                uint8_t* blit_dst = atlas->TexPixelsAlpha8 + rect.y * atlas->TexWidth + rect.x;
-                font_face.BlitGlyph(ft_glyph_bitmap, blit_dst, atlas->TexWidth, multiply_enabled ? multiply_table : NULL);
-                FT_Done_Glyph(ft_glyph);
-
-                float char_advance_x_org = glyph_info.AdvanceX;
+            float char_advance_x_org = info.AdvanceX;
             float char_advance_x_mod = ImClamp(char_advance_x_org, cfg.GlyphMinAdvanceX, cfg.GlyphMaxAdvanceX);
             float char_off_x = font_off_x;
             if (char_advance_x_org != char_advance_x_mod)
                 char_off_x += cfg.PixelSnapH ? (float)(int)((char_advance_x_mod - char_advance_x_org) * 0.5f) : (char_advance_x_mod - char_advance_x_org) * 0.5f;
             
             // Register glyph
-                dst_font->AddGlyph((ImWchar)codepoint, 
-                    glyph_info.OffsetX + char_off_x, 
-                    glyph_info.OffsetY + font_off_y, 
-                    glyph_info.OffsetX + char_off_x + glyph_info.Width, 
-                    glyph_info.OffsetY + font_off_y + glyph_info.Height,
-                    rect.x / (float)atlas->TexWidth, 
-                    rect.y / (float)atlas->TexHeight, 
-                    (rect.x + glyph_info.Width) / (float)atlas->TexWidth, 
-                    (rect.y + glyph_info.Height) / (float)atlas->TexHeight,
-                    char_advance_x_mod);
-            }
+            float x0 = info.OffsetX + char_off_x;
+            float y0 = info.OffsetY + font_off_y;
+            float x1 = x0 + info.Width;
+            float y1 = y0 + info.Height;
+            float u0 = (tx) / (float)atlas->TexWidth;
+            float v0 = (ty) / (float)atlas->TexHeight;
+            float u1 = (tx + info.Width) / (float)atlas->TexWidth;
+            float v1 = (ty + info.Height) / (float)atlas->TexHeight;
+            dst_font->AddGlyph((ImWchar)src_glyph.Codepoint, x0, y0, x1, y1, u0, v0, u1, v1, char_advance_x_mod);
         }
+
+        src_tmp.Rects = NULL;
     }
 
     // Cleanup
-    for (int n = 0; n < fonts.Size; n++)
-        fonts[n].Shutdown();
+    for (int buf_i = 0; buf_i < buf_bitmap_buffers.Size; buf_i++)
+        ImGui::MemFree(buf_bitmap_buffers[buf_i]);
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
+        src_tmp_array[src_i].~ImFontBuildSrcDataFT();
 
     ImFontAtlasBuildFinish(atlas);
 
     return true;
 }
+
+bool ImGuiFreeType::BuildFontAtlas(ImFontAtlas* atlas, unsigned int extra_flags)
+{
+    FT_Library ft_library;
+    FT_Error error = FT_Init_FreeType(&ft_library);
+    if (error != 0)
+        return false;
+
+    bool ret = ImFontAtlasBuildWithFreeType(ft_library, atlas, extra_flags);
+    FT_Done_FreeType(ft_library);
+
+    return ret;
+}

misc/freetype/imgui_freetype.h

@@ -1,4 +1,4 @@
-// Wrapper to use Freetype (instead of stb_truetype) for Dear ImGui
+// Wrapper to use FreeType (instead of stb_truetype) for Dear ImGui
 // Get latest version at https://github.com/ocornut/imgui/tree/master/misc/freetype
 // Original code by @Vuhdo (Aleksei Skriabin), maintained by @ocornut
 

misc/natvis/imgui.natvis

@@ -33,7 +33,7 @@
 </Type>
 
 <Type Name="ImGuiWindow">
-  <DisplayString>{{Name={Name,s} Active {(Active||WasActive)?1:0,d} Child {(Flags &amp; 0x01000000)?1:0,d} Popup {(Flags &amp; 0x04000000)?1:0,d}}</DisplayString>
+  <DisplayString>{{Name {Name,s} Active {(Active||WasActive)?1:0,d} Child {(Flags &amp; 0x01000000)?1:0,d} Popup {(Flags &amp; 0x04000000)?1:0,d} Hidden {(Hidden)?1:0,d}}</DisplayString>
 </Type>
   
 </AutoVisualizer>