imconfig: Added IMGUI_STB_TRUETYPE_FILENAME, IMGUI_STB_RECT_PACK_FILENAME + documenting IMGUI_DISABLE_STB_XXX flags and hiding IMGUI_STB_NAMESPACE which is misleading.

Fixed typos in todo list.

CHANGELOG.txt

@@ -67,6 +67,7 @@ Breaking Changes:
 Other Changes:
 (IN PROGRESS, WILL ADD TO THIS LIST AS WE WORK ON 1.60)
 
+- Doc: Added a Changelog file in the repository to ease comparing versions (it goes back to dear imgui 1.48), until now it was only on GitHub.
 - Navigation: merged in the gamepad/keyboard navigation (about one million changes!). (#787, #323)
   The initial focus was to support game controllers, but keyboard is becoming increasingly and decently usable.
  - To use Keyboard Navigation:
@@ -138,12 +139,13 @@ Other Changes:
 - ImDrawList: Fixed AddRect() with antialiasing disabled (lower-right corner pixel was often missing, rounding looks a little better.) (#1646)
 - ImDrawList: Added CloneOutput() helper to facilitate the cloning of ImDrawData or ImDrawList for multi-threaded rendering.
 - Misc: Functions passed to libc qsort are explicitely marked cdecl to support compiling with vectorcall as the default calling convention. (#1230, #1611) [@RandyGaul]
-- Misc: ImVec2: added [] operator. This is becoming desirable for some types of code, better added sooner than later.
+- Misc: ImVec2: added [] operator. This is becoming desirable for some code working of either axes independently. Better adding it sooner than later.
-- Misc: Exposed IM_OFFSETOF() helper in imgui.h.
 - Misc: NewFrame(): Added an assert to detect incorrect filling of the io.KeyMap[] array earlier. (#1555)
+- Misc: Added IM_OFFSETOF() helper in imgui.h (previously was in imgui_internal.h)
 - Misc: Added obsolete redirection function GetItemsLineHeightWithSpacing() (which redirects to GetFrameHeightWithSpacing()), as intended and stated in docs of 1.53.
-- Misc: Added misc/natvis/imgui.natvis for visual studio debugger users to easily visualizer imgui internal types. Added to examples projects.
+- Misc: Added misc/natvis/imgui.natvis for visual studio debugger users to easily visualize imgui internal types. Added to examples projects.
 - Misc: Added IMGUI_USER_CONFIG to define a custom configuration filename. (#255, #1573, #1144, #41)
+- Misc: Added IMGUI_STB_TRUETYPE_FILENAME and IMGUI_STB_RECT_PACK_FILENAME compile time directives to use another version of the stb_ files.
 - Misc: Updated stb_rect_pack from 0.10 to 0.11 (minor changes).
 - Misc: Added ImGuiConfigFlags_IsSRGB and ImGuiConfigFlags_IsTouchScreen user flags (for io.ConfigFlags). 
   (Those flags are not used by ImGui itself, they only exists to make it easy for the engine/back-end to pass information to the application in a standard manner.)

imconfig.h

@@ -37,8 +37,12 @@
 //---- Pack colors to BGRA8 instead of RGBA8 (if you needed to convert from one to another anyway)
 //#define IMGUI_USE_BGRA_PACKED_COLOR
 
-//---- Implement STB libraries in a namespace to avoid linkage conflicts (defaults to global namespace)
+//---- Avoid multiple STB libraries implementations, or redefine path/filenames to prioritize another version
-//#define IMGUI_STB_NAMESPACE     ImGuiStb
+// By default the embedded implementations are declared static and not available outside of imgui cpp files.
+//#define IMGUI_STB_TRUETYPE_FILENAME   "my_folder/stb_truetype.h"
+//#define IMGUI_STB_RECT_PACK_FILENAME  "my_folder/stb_rect_pack.h"
+//#define IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION
+//#define IMGUI_DISABLE_STB_RECT_PACK_IMPLEMENTATION
 
 //---- Define constructor and implicit cast operators to convert back<>forth from your math types and ImVec2/ImVec4.
 // This will be inlined as part of ImVec2 and ImVec4 class declarations.

imgui_draw.cpp

@@ -61,9 +61,12 @@
 // STB libraries implementation
 //-------------------------------------------------------------------------
 
-//#define IMGUI_STB_NAMESPACE     ImGuiStb
+// Compile time options:
-//#define IMGUI_DISABLE_STB_RECT_PACK_IMPLEMENTATION
+//#define IMGUI_STB_NAMESPACE           ImGuiStb
+//#define IMGUI_STB_TRUETYPE_FILENAME   "my_folder/stb_truetype.h"
+//#define IMGUI_STB_RECT_PACK_FILENAME  "my_folder/stb_rect_pack.h"
 //#define IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION
+//#define IMGUI_DISABLE_STB_RECT_PACK_IMPLEMENTATION
 
 #ifdef IMGUI_STB_NAMESPACE
 namespace IMGUI_STB_NAMESPACE
@@ -87,23 +90,31 @@ namespace IMGUI_STB_NAMESPACE
 #pragma GCC diagnostic ignored "-Wtype-limits"              // warning: comparison is always true due to limited range of data type [-Wtype-limits]
 #endif
 
-#define STBRP_ASSERT(x)    IM_ASSERT(x)
 #ifndef IMGUI_DISABLE_STB_RECT_PACK_IMPLEMENTATION
 #define STBRP_STATIC
+#define STBRP_ASSERT(x)    IM_ASSERT(x)
 #define STB_RECT_PACK_IMPLEMENTATION
 #endif
+#ifdef IMGUI_STB_RECT_PACK_FILENAME
+#include IMGUI_STB_RECT_PACK_FILENAME
+#else
 #include "stb_rect_pack.h"
+#endif
 
+#ifndef IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION
 #define STBTT_malloc(x,u)  ((void)(u), ImGui::MemAlloc(x))
 #define STBTT_free(x,u)    ((void)(u), ImGui::MemFree(x))
 #define STBTT_assert(x)    IM_ASSERT(x)
-#ifndef IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION
 #define STBTT_STATIC
 #define STB_TRUETYPE_IMPLEMENTATION
 #else
 #define STBTT_DEF extern
 #endif
+#ifdef IMGUI_STB_TRUETYPE_FILENAME
+#include IMGUI_STB_TRUETYPE_FILENAME
+#else
 #include "stb_truetype.h"
+#endif
 
 #ifdef __GNUC__
 #pragma GCC diagnostic pop