Renamed section in documentation

MacOS X examples fixes

README.md

@@ -13,6 +13,8 @@ After ImGui is setup in your engine, you can use it like in this example:
 
 ImGui outputs vertex buffers and simple command-lists that you can render in your application. Because it doesn't know or touch graphics state directly, you can call ImGui commands anywhere in your code (e.g. in the middle of a running algorithm, or in the middle of your own rendering process). Refer to the sample applications in the examples/ folder for instructions on how to integrate ImGui with your existing codebase. 
 
+ImGui allows you create elaborate tools as well as very short-lived ones. On the extreme side of short-liveness: using the Edit&Continue feature of compilers you can add a few widgets to tweaks variables while your application is running, and remove the code a minute later! ImGui is not just for tweaking values. You can use it to trace a running algorithm by just emitting text commands. You can use it along with your own reflection data to browse your dataset live. You can use it to expose the internals of a subsystem in your engine, to create a logger, an inspection tool, a profiler, a debugger, etc. 
+
 Gallery
 -------
 
@@ -34,7 +36,7 @@ Frequently Asked Question
 -------------------------
 <b>How do you use ImGui on a platform that may not have a mouse and keyboard?</b>
 
-I recommend using [Synergy](http://synergy-project.org) and the uSynergy.c micro client to share your mouse and keyboard. This way you can seemingly use your PC input devices on a video game console or a tablet. ImGui was also designed to function with touch inputs if you increase the padding of widgets to compensate for the lack of precision of touch devices, but it is recommended you use a mouse to allow optimising for screen real-estate.
+I recommend using [Synergy](http://synergy-project.org). With the uSynergy.c micro client running you can seamlessly use your PC input devices from a video game console or a tablet. ImGui was also designed to function with touch inputs if you increase the padding of widgets to compensate for the lack of precision of touch devices, but it is recommended you use a mouse to allow optimising for screen real-estate.
 
 <b>I integrated ImGui in my engine and the text or lines are blurry..</b>
 
@@ -51,6 +53,10 @@ Yes, you can alter the look of the interface to some degree: changing colors, si
 
 ![skinning screenshot 1](/web/skinning_sample_01.png?raw=true)
 
+<b>Can you develop features xxxx for ImGui?</b>
+
+Please use GitHub 'Issues' facilities to suggest and discuss improvements. If you are company and would like specific non-trivial features to be implemented, I am available for hire to work on or with ImGui. Donations are also welcome to support further work on the library. 
+
 
 Credits
 -------

examples/opengl_example/Makefile.Macosx

@@ -4,7 +4,7 @@
 #    brew install glfw3
 #
 
-CXXFLAGS=-framework OpenGL -framework Cocoa -framework IOKit 
+CXXFLAGS=-framework OpenGL -framework Cocoa -framework IOKit -framework CoreVideo
 CXXFLAGS+=-I/usr/local/Cellar/glew/1.10.0/include -I/usr/local/Cellar/glfw3/3.0.4/include
 CXXFLAGS+=-L/usr/local/Cellar/glew/1.10.0/lib -L/usr/local/Cellar/glfw3/3.0.4/lib
 CXXFLAGS+=-lglew -lglfw3

examples/opengl_example/main.cpp

@@ -10,6 +10,7 @@
 
 static GLFWwindow* window;
 static GLuint fontTex;
+static ImVec2 mousePosScale(1.0f, 1.0f);
 
 // This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
 // If text or lines are blurry when integrating ImGui in your engine:
@@ -146,10 +147,14 @@ void InitGL()
 void InitImGui()
 {
     int w, h;
+    int fb_w, fb_h;
     glfwGetWindowSize(window, &w, &h);
+    glfwGetFramebufferSize(window, &fb_w, &fb_h);
+    mousePosScale.x = (float)fb_w / w;                  // Some screens e.g. Retina display have framebuffer size != from window size, and mouse inputs are given in window/screen coordinates.
+    mousePosScale.y = (float)fb_h / h;
 
     ImGuiIO& io = ImGui::GetIO();
-    io.DisplaySize = ImVec2((float)w, (float)h);        // Display size, in pixels. For clamping windows positions.
+    io.DisplaySize = ImVec2((float)fb_w, (float)fb_h);  // Display size, in pixels. For clamping windows positions.
     io.DeltaTime = 1.0f/60.0f;                          // Time elapsed since last frame, in seconds (in this sample app we'll override this every frame because our timestep is variable)
     io.PixelCenterOffset = 0.0f;                        // Align OpenGL texels
     io.KeyMap[ImGuiKey_Tab] = GLFW_KEY_TAB;             // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array.
@@ -202,7 +207,7 @@ void UpdateImGui()
     // (we already got mouse wheel, keyboard keys & characters from glfw callbacks polled in glfwPollEvents())
     double mouse_x, mouse_y;
     glfwGetCursorPos(window, &mouse_x, &mouse_y);
-    io.MousePos = ImVec2((float)mouse_x, (float)mouse_y);                           // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
+    io.MousePos = ImVec2((float)mouse_x * mousePosScale.x, (float)mouse_y * mousePosScale.y); // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
     io.MouseDown[0] = glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_LEFT) != 0;
     io.MouseDown[1] = glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_RIGHT) != 0;
 

imconfig.h

@@ -1,14 +1,11 @@
 //-----------------------------------------------------------------------------
 // USER IMPLEMENTATION
+// This file contains compile-time options for ImGui.
+// Other options (memory allocation overrides, callbacks, etc.) can be set at runtime via the ImGuiIO structure - ImGui::GetIO().
 //-----------------------------------------------------------------------------
 
 #pragma once
 
-//---- Define your own malloc/free/realloc functions if you want to override internal memory allocations for ImGui
-//#define IM_MALLOC(_SIZE)			MyMalloc(_SIZE)			// void* MyMalloc(size_t size);
-//#define IM_FREE(_PTR)				MyFree(_PTR)			// void MyFree(void *ptr);
-//#define IM_REALLOC(_PTR, _SIZE)	MyRealloc(_PTR, _SIZE)	// void* MyRealloc(void *ptr, size_t size);
-
 //---- Define your own ImVector<> type if you don't want to use the provided implementation defined in imgui.h
 //#include <vector>
 //#define ImVector  std::vector
@@ -17,9 +14,12 @@
 //---- Define assertion handler. Defaults to calling assert().
 //#define IM_ASSERT(_EXPR)  MyAssert(_EXPR)
 
-//---- Don't implement default clipboard handlers for Windows (so as not to link with OpenClipboard(), etc.)
+//---- Don't implement default clipboard handlers for Windows (so as not to link with OpenClipboard() and others Win32 functions)
 //#define IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCS
 
+//---- Include imgui_user.cpp at the end of imgui.cpp so you can include code that extends ImGui using its private data/functions.
+//#define IMGUI_INCLUDE_IMGUI_USER_CPP
+
 //---- Define implicit cast operators to convert back<>forth from your math types and ImVec2/ImVec4.
 /*
 #define IM_VEC2_CLASS_EXTRA                                                 \
@@ -32,6 +32,7 @@
 */
 
 //---- Freely implement extra functions within the ImGui:: namespace.
+//---- Declare helpers or widgets implemented in imgui_user.cpp or elsewhere, so end-user doesn't need to include multiple files.
 //---- e.g. you can create variants of the ImGui::Value() helper for your low-level math types.
 /*
 namespace ImGui

imgui.h

@@ -1,4 +1,4 @@
-// ImGui library
+// ImGui library v1.12
 // See .cpp file for commentary.
 // See ImGui::ShowTestWindow() for sample code.
 // Read 'Programmer guide' in .cpp for notes on how to setup ImGui in your codebase.
@@ -19,18 +19,6 @@ struct ImGuiWindow;
 #include <stdarg.h>         // va_list
 #include <stdlib.h>         // NULL, malloc
 
-#ifndef IM_MALLOC
-#define IM_MALLOC(_SIZE) malloc((_SIZE))
-#endif
-
-#ifndef IM_FREE
-#define IM_FREE(_PTR) free((_PTR))
-#endif
-
-#ifndef IM_REALLOC
-#define IM_REALLOC(_PTR, _SIZE) realloc((_PTR), (_SIZE))
-#endif
-
 #ifndef IM_ASSERT
 #include <assert.h>
 #define IM_ASSERT(_EXPR)    assert(_EXPR)
@@ -67,8 +55,17 @@ struct ImVec4
 #endif
 };
 
+namespace ImGui
+{
+	// Proxy functions to access the MemAllocFn/MemFreeFn/MemReallocFn pointers in ImGui::GetIO(). The only reason they exist here is to allow ImVector<> to compile inline.
+    void*       MemAlloc(size_t sz);
+	void        MemFree(void* ptr);
+	void*       MemRealloc(void* ptr, size_t sz);
+};
+
 // 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). 
-// this implementation does NOT call c++ constructors! we don't need them! also only provide the minimum functionalities we need.
+// Use '#define ImVector std::vector' if you want to use the STL type or your own type.
+// Our implementation does NOT call c++ constructors! because the data types we use don't need them (but that could be added as well). Only provide the minimum functionalities we need.
 #ifndef ImVector
 template<typename T>
 class ImVector
@@ -84,7 +81,7 @@ public:
     typedef const value_type*   const_iterator;
 
     ImVector()                  { Size = Capacity = 0; Data = NULL; }
-    ~ImVector()                 { if (Data) IM_FREE(Data); }
+    ~ImVector()                 { if (Data) ImGui::MemFree(Data); }
 
     inline bool                 empty() const                   { return Size == 0; }
     inline size_t               size() const                    { return Size; }
@@ -95,7 +92,7 @@ public:
     inline value_type&          operator[](size_t i)            { IM_ASSERT(i < Size); return Data[i]; }
     inline const value_type&    operator[](size_t i) const      { IM_ASSERT(i < Size); return Data[i]; }
 
-    inline void                 clear()                         { if (Data) { Size = Capacity = 0; IM_FREE(Data); Data = NULL; } }
+    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; }
@@ -106,14 +103,14 @@ public:
     inline const value_type&    back() const                    { IM_ASSERT(Size > 0); return at(Size-1); }
     inline void                 swap(ImVector<T>& rhs)          { const size_t rhs_size = rhs.Size; rhs.Size = Size; Size = rhs_size; const size_t rhs_cap = rhs.Capacity; rhs.Capacity = Capacity; Capacity = rhs_cap; value_type* rhs_data = rhs.Data; rhs.Data = Data; Data = rhs_data; }
 
-    inline void                 reserve(size_t new_capacity)    { Data = (value_type*)IM_REALLOC(Data, new_capacity * sizeof(value_type)); Capacity = new_capacity; }
+    inline void                 reserve(size_t new_capacity)    { Data = (value_type*)ImGui::MemRealloc(Data, new_capacity * sizeof(value_type)); Capacity = new_capacity; }
     inline void                 resize(size_t new_size)         { if (new_size > Capacity) reserve(new_size); Size = new_size; }
 
     inline void                 push_back(const value_type& v)  { if (Size == Capacity) reserve(Capacity ? Capacity * 2 : 4); Data[Size++] = v; }
     inline void                 pop_back()                      { IM_ASSERT(Size > 0); Size--; }
 
-    inline iterator             erase(const_iterator it)        { IM_ASSERT(it >= begin() && it < end()); const int off = it - begin(); memmove(Data + off, Data + off + 1, (Size - off - 1) * sizeof(value_type)); Size--; return Data + off; }
-    inline void                 insert(const_iterator it, const value_type& v)  { IM_ASSERT(it >= begin() && it <= end()); const int off = it - begin(); if (Size == Capacity) reserve(Capacity ? Capacity * 2 : 4); if (off < (int)Size) memmove(Data + off + 1, Data + off, (Size - off) * sizeof(value_type)); Data[off] = v; Size++; }
+    inline iterator             erase(const_iterator it)        { IM_ASSERT(it >= begin() && it < end()); const ptrdiff_t off = it - begin(); memmove(Data + off, Data + off + 1, (Size - off - 1) * sizeof(value_type)); Size--; return Data + off; }
+    inline void                 insert(const_iterator it, const value_type& v)  { IM_ASSERT(it >= begin() && it <= end()); const ptrdiff_t off = it - begin(); if (Size == Capacity) reserve(Capacity ? Capacity * 2 : 4); if (off < (int)Size) memmove(Data + off + 1, Data + off, (Size - off) * sizeof(value_type)); Data[off] = v; Size++; }
 };
 #endif // #ifndef ImVector
 
@@ -145,16 +142,16 @@ namespace ImGui
     void        BeginChild(const char* str_id, ImVec2 size = ImVec2(0,0), bool border = false, ImGuiWindowFlags extra_flags = 0);
     void        EndChild();
     bool        GetWindowIsFocused();
-    float       GetWindowWidth();
-    ImVec2      GetWindowPos();                                                     // you should rarely need/care about the window position, but it can be useful if you want to use your own drawing
-    void        SetWindowPos(const ImVec2& pos);                                    // set current window pos
     ImVec2      GetWindowSize();
+    float       GetWindowWidth();
+    ImVec2      GetWindowPos();                                                     // you should rarely need/care about the window position, but it can be useful if you want to use your own drawing.
+    void        SetWindowPos(const ImVec2& pos);                                    // set current window pos.
     ImVec2      GetWindowContentRegionMin();
     ImVec2      GetWindowContentRegionMax();
-    ImDrawList* GetWindowDrawList();
-    void        SetFontScale(float scale);
-    void        SetScrollPosHere();
-    void        SetTreeStateStorage(ImGuiStorage* tree);
+    ImDrawList* GetWindowDrawList();                                                // get rendering command-list if you want to append your own draw primitives.
+    void        SetWindowFontScale(float scale);                                    // per-window font scale. Adjust IO.FontBaseScale if you want to scale all windows together.
+    void        SetScrollPosHere();                                                 // adjust scrolling position to center into the current cursor position.
+    void        SetTreeStateStorage(ImGuiStorage* tree);                            // replace tree state storage with our own (if you want to manipulate it yourself, typically clear subsection of it).
     ImGuiStorage* GetTreeStateStorage();
     void        PushItemWidth(float item_width);
     void        PopItemWidth();
@@ -166,7 +163,8 @@ namespace ImGui
 
     // Tooltip
     void        SetTooltip(const char* fmt, ...);                                   // set tooltip under mouse-cursor, typically use with ImGui::IsHovered(). last call wins.
-    void        BeginTooltip();                                                     // use to create full-featured tooltip windows that aren't just text. 
+    void        SetTooltipV(const char* fmt, va_list args);
+    void        BeginTooltip();                                                     // use to create full-featured tooltip windows that aren't just text.
     void        EndTooltip();
 
     // Layout
@@ -178,12 +176,12 @@ namespace ImGui
     float       GetColumnOffset(int column_index = -1);
     void        SetColumnOffset(int column_index, float offset);
     float       GetColumnWidth(int column_index = -1);
-    ImVec2      GetCursorPos();                                                     // cursor position relative to window position
+    ImVec2      GetCursorPos();                                                     // cursor position is relative to window position
     void        SetCursorPos(const ImVec2& pos);                                    // "
     void        SetCursorPosX(float x);                                             // "
     void        SetCursorPosY(float y);                                             // "
     ImVec2      GetCursorScreenPos();												// cursor position in screen space
-    void        AlignFirstTextHeightToWidgets();                                    // call once if the first item on the line is a Text() item and you want to vertically lower it to match higher widgets.
+    void        AlignFirstTextHeightToWidgets();                                    // call once if the first item on the line is a Text() item and you want to vertically lower it to match subsequent (bigger) widgets.
     float       GetTextLineSpacing();
     float       GetTextLineHeight();
 
@@ -197,16 +195,19 @@ namespace ImGui
     void        Text(const char* fmt, ...);
     void        TextV(const char* fmt, va_list args);
     void        TextColored(const ImVec4& col, const char* fmt, ...);               // shortcut to doing PushStyleColor(ImGuiCol_Text, col); Text(fmt, ...); PopStyleColor();
+    void        TextColoredV(const ImVec4& col, const char* fmt, va_list args);
     void        TextUnformatted(const char* text, const char* text_end = NULL);     // doesn't require null terminated string if 'text_end' is specified. no copy done to any bounded stack buffer, better for long chunks of text.
     void        LabelText(const char* label, const char* fmt, ...);
+    void        LabelTextV(const char* label, const char* fmt, va_list args);
     void        BulletText(const char* fmt, ...);
+    void        BulletTextV(const char* fmt, va_list args);
     bool        Button(const char* label, ImVec2 size = ImVec2(0,0), bool repeat_when_held = false);
     bool        SmallButton(const char* label);
     bool        CollapsingHeader(const char* label, const char* str_id = NULL, const bool display_frame = true, const bool default_open = false);
-    bool        SliderFloat(const char* label, float* v, float v_min, float v_max, const char* display_format = "%.3f", float power = 1.0f);
+    bool        SliderFloat(const char* label, float* v, float v_min, float v_max, const char* display_format = "%.3f", float power = 1.0f);     // adjust display_format to decorate the value with a prefix or a suffix. Use power!=1.0 for logarithmic sliders.
     bool        SliderFloat2(const char* label, float v[2], float v_min, float v_max, const char* display_format = "%.3f", float power = 1.0f);
     bool        SliderFloat3(const char* label, float v[3], float v_min, float v_max, const char* display_format = "%.3f", float power = 1.0f);
-    bool        SliderFloat4(const char* label, float v[3], float v_min, float v_max, const char* display_format = "%.3f", float power = 1.0f);
+    bool        SliderFloat4(const char* label, float v[4], float v_min, float v_max, const char* display_format = "%.3f", float power = 1.0f);
     bool        SliderAngle(const char* label, float* v, float v_degrees_min = -360.0f, float v_degrees_max = +360.0f);     // *v in radians
     bool        SliderInt(const char* label, int* v, int v_min, int v_max, const char* display_format = "%.0f");
     void        PlotLines(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), size_t stride = sizeof(float));
@@ -215,12 +216,12 @@ namespace ImGui
     bool        CheckboxFlags(const char* label, unsigned int* flags, unsigned int flags_value);
     bool        RadioButton(const char* label, bool active);
     bool        RadioButton(const char* label, int* v, int v_button);
-    bool        InputFloat(const char* label, float* v, float step = 0.0f, float step_fast = 0.0f, int decimal_precision = -1);
+    bool        InputText(const char* label, char* buf, size_t buf_size, ImGuiInputTextFlags flags = 0);
+    bool        InputFloat(const char* label, float* v, float step = 0.0f, float step_fast = 0.0f, int decimal_precision = -1, ImGuiInputTextFlags extra_flags = 0);
     bool        InputFloat2(const char* label, float v[2], int decimal_precision = -1);
     bool        InputFloat3(const char* label, float v[3], int decimal_precision = -1);
     bool        InputFloat4(const char* label, float v[4], int decimal_precision = -1);
-    bool        InputInt(const char* label, int* v, int step = 1, int step_fast = 100);
-    bool        InputText(const char* label, char* buf, size_t buf_size, ImGuiInputTextFlags flags = 0);
+    bool        InputInt(const char* label, int* v, int step = 1, int step_fast = 100, ImGuiInputTextFlags extra_flags = 0);
     bool        Combo(const char* label, int* current_item, const char** items, int items_count, int popup_height_items = 7);
     bool        Combo(const char* label, int* current_item, const char* items_separated_by_zeros, int popup_height_items = 7);      // Separate items with \0, end item-list with \0\0
     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_height_items = 7);
@@ -228,10 +229,12 @@ namespace ImGui
     bool        ColorEdit3(const char* label, float col[3]);
     bool        ColorEdit4(const char* label, float col[4], bool show_alpha = true);
     void        ColorEditMode(ImGuiColorEditMode mode);
-    bool        TreeNode(const char* str_label_id);                                 // if returning 'true' the user is responsible for calling TreePop
+    bool        TreeNode(const char* str_label_id);                                 // if returning 'true' the node is open and the user is responsible for calling TreePop
     bool        TreeNode(const char* str_id, const char* fmt, ...);                 // "
     bool        TreeNode(const void* ptr_id, const char* fmt, ...);                 // "
-    void        TreePush(const char* str_id = NULL);                                // already called by TreeNode(), but you can call Push/Pop yourself for layout purpose
+    bool        TreeNodeV(const char* str_id, const char* fmt, va_list args);       // "
+    bool        TreeNodeV(const void* ptr_id, const char* fmt, va_list args);       // "
+    void        TreePush(const char* str_id = NULL);                                // already called by TreeNode(), but you can call Push/Pop yourself for layouting purpose
     void        TreePush(const void* ptr_id = NULL);                                // "
     void        TreePop();
     void        OpenNextNode(bool open);                                            // force open/close the next TreeNode or CollapsingHeader
@@ -260,8 +263,11 @@ namespace ImGui
     bool        IsKeyPressed(int key_index, bool repeat = true);                    // key_index into the keys_down[512] array, imgui doesn't know the semantic of each entry
     bool        IsMouseClicked(int button, bool repeat = false);
     bool        IsMouseDoubleClicked(int button);
-    bool        IsMouseHoveringBox(const ImVec2& box_min, const ImVec2& box_max);
-    ImVec2      GetMousePos();
+	bool		IsMouseHoveringWindow();                                            // is mouse hovering current window ("window" in API names always refer to current window)
+	bool		IsMouseHoveringAnyWindow();											// is mouse hovering any active imgui window
+    bool        IsMouseHoveringBox(const ImVec2& box_min, const ImVec2& box_max);   // is mouse hovering given bounding box
+	bool		IsPosHoveringAnyWindow(const ImVec2& pos);							// is given position hovering any active imgui window
+    ImVec2      GetMousePos();                                                      // shortcut to ImGui::GetIO().MousePos provided by user, to be consistent with other calls
     float       GetTime();
     int         GetFrameCount();
     const char* GetStyleColorName(ImGuiCol idx);
@@ -290,10 +296,11 @@ enum ImGuiWindowFlags_
 enum ImGuiInputTextFlags_
 {
     // Default: 0
-    ImGuiInputTextFlags_CharsDecimal        = 1 << 0,
-    ImGuiInputTextFlags_CharsHexadecimal    = 1 << 1,
-    ImGuiInputTextFlags_AutoSelectAll       = 1 << 2,
-    ImGuiInputTextFlags_AlignCenter         = 1 << 3,
+    ImGuiInputTextFlags_CharsDecimal        = 1 << 0,   // Allow 0123456789.+-*/
+    ImGuiInputTextFlags_CharsHexadecimal    = 1 << 1,   // Allow 0123456789ABCDEFabcdef
+    ImGuiInputTextFlags_AutoSelectAll       = 1 << 2,   // Select entire text when first taking focus
+    ImGuiInputTextFlags_EnterReturnsTrue    = 1 << 3,   // Return 'true' when Enter is pressed (as opposed to when the value was modified)
+    //ImGuiInputTextFlags_AlignCenter       = 1 << 3,
 };
 
 // User fill ImGuiIO.KeyMap[] array with indices into the ImGuiIO.KeysDown[512] array
@@ -405,7 +412,8 @@ struct ImGuiIO
     ImFont      Font;                       // <auto>                   // Gets passed to text functions. Typedef ImFont to the type you want (ImBitmapFont* or your own font).
 	float		FontYOffset;				// = 0.0f					// Offset font rendering by xx pixels in Y axis.
     ImVec2      FontTexUvForWhite;          // = (0.0f,0.0f)            // Font texture must have a white pixel at this UV coordinate. Adjust if you are using custom texture.
-    bool        FontAllowScaling;           // = false                  // Set to allow scaling text with CTRL+Wheel.
+	float       FontBaseScale;              // = 1.0f                   // Base font scale, multiplied by the per-window font scale which you can adjust with SetFontScale()
+    bool        FontAllowUserScaling;       // = false                  // Set to allow scaling text with CTRL+Wheel.
     float       PixelCenterOffset;          // = 0.0f                   // Try to set to 0.5f or 0.375f if rendering is blurry
 
     // Settings - Rendering function (REQUIRED)
@@ -418,6 +426,12 @@ struct ImGuiIO
     // NB- for SetClipboardTextFn, the string is *NOT* zero-terminated at 'text_end'
     const char* (*GetClipboardTextFn)();                                        
     void        (*SetClipboardTextFn)(const char* text, const char* text_end);
+	
+	// Settings - Memory allocation
+	// Default to posix malloc/realloc/free functions.
+	void*       (*MemAllocFn)(size_t sz);
+	void*       (*MemReallocFn)(void* ptr, size_t sz);
+	void        (*MemFreeFn)(void* ptr);
 
     // Input - Fill before calling NewFrame()
     ImVec2      MousePos;                   // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
@@ -429,8 +443,8 @@ struct ImGuiIO
     char        InputCharacters[16];        // List of characters input (translated by user from keypress+keyboard state). Fill using AddInputCharacter() helper.
 
     // Output - Retrieve after calling NewFrame(), you can use them to discard inputs or hide them from the rest of your application
-    bool        WantCaptureMouse;           // ImGui is using your mouse input (= window is being hovered or widget is active).
-    bool        WantCaptureKeyboard;        // imGui is using your keyboard input (= widget is active).
+    bool        WantCaptureMouse;           // Mouse is hovering a window or widget is active (= ImGui will use your mouse input)
+    bool        WantCaptureKeyboard;        // Widget is active (= ImGui will use your keyboard input)
 
     // Function
     void        AddInputCharacter(char c);  // Helper to add a new character into InputCharacters[]
@@ -467,9 +481,9 @@ private:
 // Helper: Parse and apply text filters. In format "aaaaa[,bbbb][,ccccc]"
 struct ImGuiTextFilter
 {
-    struct TextRange 
-    { 
-        const char* b; 
+    struct TextRange
+    {
+        const char* b;
         const char* e;
 
         TextRange() { b = e = NULL; }
@@ -478,7 +492,7 @@ struct ImGuiTextFilter
         const char* end() const { return e; }
         bool empty() const { return b == e; }
         char front() const { return *b; }
-        static bool isblank(char c) { return c == ' ' || c == '\t'; } 
+        static bool isblank(char c) { return c == ' ' || c == '\t'; }
         void trim_blanks() { while (b < e && isblank(*b)) b++; while (e > b && isblank(*(e-1))) e--; }
         void split(char separator, ImVector<TextRange>& out);
     };