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imgui/misc/fonts/README.txt

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The code in imgui.cpp embeds a copy of 'ProggyClean.ttf' (by Tristan Grimmer) that is used by default.
We embed the font in source code so you can use Dear ImGui without any file system access.
You may also load external .TTF/.OTF files.
The files in this folder are suggested fonts, provided as a convenience.
(Note: .OTF support in stb_truetype.h currently doesn't appear to load every font)
Fonts are rasterized in a single texture at the time of calling either of io.Fonts.GetTexDataAsAlpha8()/GetTexDataAsRGBA32()/Build().
Also read dear imgui FAQ in imgui.cpp!
In this document:
- Using Icons
- Fonts Loading Instructions
- FreeType rasterizer, Small font sizes
- Building Custom Glyph Ranges
- Remapping Codepoints
- Embedding Fonts in Source Code
- Credits/Licences for fonts included in this folder
- Links, Other fonts
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USING ICONS
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Using an icon font (such as FontAwesome: http://fontawesome.io) is an easy and practical way to use icons in your ImGui application.
A common pattern is to merge the icon font within your main font, so you can embed icons directly from your strings without
having to change fonts back and forth.
To refer to the icon UTF-8 codepoints from your C++ code, you may use those headers files created by Juliette Foucaut:
https://github.com/juliettef/IconFontCppHeaders
The C++11 version of those files uses the u8"" utf-8 encoding syntax + \u
#define ICON_FA_SEARCH u8"\uf002"
The pre-C++11 version has the values directly encoded as utf-8:
#define ICON_FA_SEARCH "\xEF\x80\x82"
Example:
// Merge icons into default tool font
#include "IconsFontAwesome.h"
ImGuiIO& io = ImGui::GetIO();
io.Fonts->AddFontDefault();
ImFontConfig config;
config.MergeMode = true;
static const ImWchar icon_ranges[] = { ICON_MIN_FA, ICON_MAX_FA, 0 };
io.Fonts->AddFontFromFileTTF("fonts/fontawesome-webfont.ttf", 13.0f, &config, icon_ranges);
// Usage, e.g.
ImGui::Text("%s Search", ICON_FA_SEARCH);
See Links below for other icons fonts and related tools.
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FONTS LOADING INSTRUCTIONS
---------------------------------------
Load default font with:
ImGuiIO& io = ImGui::GetIO();
io.Fonts->AddFontDefault();
Load .TTF/.OTF file with:
ImGuiIO& io = ImGui::GetIO();
io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels);
For advanced options create a ImFontConfig structure and pass it to the AddFont function (it will be copied internally)
ImFontConfig config;
config.OversampleH = 3;
config.OversampleV = 1;
config.GlyphExtraSpacing.x = 1.0f;
io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, &config);
If you have very large number of glyphs or multiple fonts:
- Mind the fact that some graphics drivers have texture size limitation.
- Set io.Fonts.TexDesiredWidth to specify a texture width to minimize texture height (see comment in ImFontAtlas::Build function).
- Set io.Fonts.Flags |= ImFontAtlasFlags_NoPowerOfTwoHeight; to disable rounding the texture height to the next power of two.
- You may reduce oversampling, e.g. config.OversampleH = 2 or 1.
- Reduce glyphs ranges, consider calculating them based on your source data if this is possible.
Combine two fonts into one:
// Load a first font
io.Fonts->AddFontDefault();
// Add character ranges and merge into the previous font
// The ranges array is not copied by the AddFont* functions and is used lazily
// so ensure it is available for duration of font usage
static const ImWchar icons_ranges[] = { 0xf000, 0xf3ff, 0 }; // will not be copied by AddFont* so keep in scope.
ImFontConfig config;
config.MergeMode = true;
io.Fonts->AddFontFromFileTTF("DroidSans.ttf", 18.0f, &config, io.Fonts->GetGlyphRangesJapanese());
io.Fonts->AddFontFromFileTTF("fontawesome-webfont.ttf", 18.0f, &config, icons_ranges);
Add a fourth parameter to bake specific font ranges only:
// Basic Latin, Extended Latin
io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, NULL, io.Fonts->GetGlyphRangesDefault());
// Include full set of about 21000 CJK Unified Ideographs
io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, NULL, io.Fonts->GetGlyphRangesJapanese());
// Default + Hiragana, Katakana, Half-Width, Selection of 1946 Ideographs
io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, NULL, io.Fonts->GetGlyphRangesChinese());
Offset font vertically by altering the io.Font->DisplayOffset value:
ImFont* font = io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels);
font->DisplayOffset.y = 1; // Render 1 pixel down
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FREETYPE RASTERIZER, SMALL FONT SIZES
---------------------------------------
Dear Imgui uses stb_truetype.h to rasterize fonts (with optional oversampling).
This technique and implementation are not ideal for fonts rendered at _small sizes_, which may appear a little blurry.
There is an implementation of the ImFontAtlas builder using FreeType that you can use in the misc/freetype/ folder.
FreeType supports auto-hinting which tends to improve the readability of small fonts.
Note that this code currently creates textures that are unoptimally too large (could be fixed with some work)
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BUILDING CUSTOM GLYPH RANGES
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You can use the ImFontAtlas::GlyphRangesBuilder helper to create glyph ranges based on text input.
For exemple: 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;
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
builder.BuildRanges(&ranges); // Build the final result (ordered ranges with all the unique characters submitted)
io.Fonts->AddFontFromFileTTF("myfontfile.ttf", size_in_pixels, NULL, ranges.Data);
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REMAPPING CODEPOINTS
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All your strings needs to use UTF-8 encoding. Specifying literal in your source code using a local code page (such as CP-923 for Japanese, or CP-1251 for Cyrillic) will NOT work!
In C++11 you can encode a string literal in UTF-8 by using the u8"hello" syntax. Otherwise you can convert yourself to UTF-8 or load text data from file already saved as UTF-8.
e.g.
u8"hello"
u8"こんにちは"
You may also try to remap your local codepage characters to their Unicode codepoint using font->AddRemapChar(), but international users may have problems reading/editing your source code.
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EMBEDDING FONTS IN SOURCE CODE
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Compile and use 'binary_to_compressed_c.cpp' to create a compressed C style array that you can embed in source code.
See the documentation in binary_to_compressed_c.cpp for instruction on how to use the tool.
You may find a precompiled version binary_to_compressed_c.exe for Windows instead of demo binaries package (see README).
The tool optionally used Base85 encoding to reduce the size of _source code_ but the read-only arrays will be about 20% bigger.
Then load the font with:
ImFont* font = io.Fonts->AddFontFromMemoryCompressedTTF(compressed_data, compressed_data_size, size_pixels, ...);
Or
ImFont* font = io.Fonts->AddFontFromMemoryCompressedBase85TTF(compressed_data_base85, size_pixels, ...);
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CREDITS/LICENSES FOR FONTS INCLUDED IN THIS FOLDER
---------------------------------------
Roboto-Medium.ttf
Apache License 2.0
by Christian Robertson
https://fonts.google.com/specimen/Roboto
Cousine-Regular.ttf
by Steve Matteson
Digitized data copyright (c) 2010 Google Corporation.
Licensed under the SIL Open Font License, Version 1.1
https://fonts.google.com/specimen/Cousine
DroidSans.ttf
Copyright (c) Steve Matteson
Apache License, version 2.0
https://www.fontsquirrel.com/fonts/droid-sans
ProggyClean.ttf
Copyright (c) 2004, 2005 Tristan Grimmer
MIT License
recommended loading setting in ImGui: Size = 13.0, DisplayOffset.Y = +1
http://www.proggyfonts.net/
ProggyTiny.ttf
Copyright (c) 2004, 2005 Tristan Grimmer
MIT License
recommended loading setting in ImGui: Size = 10.0, DisplayOffset.Y = +1
http://www.proggyfonts.net/
Karla-Regular.ttf
Copyright (c) 2012, Jonathan Pinhorn
SIL OPEN FONT LICENSE Version 1.1
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LINKS, OTHER FONTS
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(Icons) Icon fonts
https://fortawesome.github.io/Font-Awesome/
https://github.com/SamBrishes/kenney-icon-font
https://design.google.com/icons/
You can use https://github.com/juliettef/IconFontCppHeaders for C/C++ header files with name #define to access icon codepoint in source code.
(Icons) IcoMoon - Custom Icon font builder
https://icomoon.io/app
(Regular) Open Sans Fonts
https://fonts.google.com/specimen/Open+Sans
(Regular) Google Noto Fonts (worldwide languages)
https://www.google.com/get/noto/
(Monospace) Typefaces for source code beautification
https://github.com/chrissimpkins/codeface
(Monospace) Programmation fonts
http://s9w.github.io/font_compare/
(Monospace) Proggy Programming Fonts
http://upperbounds.net
(Monospace) Inconsolata
http://www.levien.com/type/myfonts/inconsolata.html
(Monospace) Adobe Source Code Pro: Monospaced font family for user interface and coding environments
https://github.com/adobe-fonts/source-code-pro
(Monospace) Monospace/Fixed Width Programmer's Fonts
http://www.lowing.org/fonts/
(Japanese) M+ fonts by Coji Morishita are free and include most useful Kanjis you would need.
http://mplus-fonts.sourceforge.jp/mplus-outline-fonts/index-en.html
Or use Arial Unicode or other Unicode fonts provided with Windows for full characters coverage (not sure of their licensing).
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