Added IMGUI_USE_WCHAR32 instead of "#define ImWchar ImWchar32" to faclitate C-binding. (#2538, #2541, #2815)

.github/workflows/build.yml

@@ -202,7 +202,7 @@ jobs:
 
     - name: Build example_null (with ImWchar32)
       run: |
-        echo '#define ImWchar ImWchar32'                       >  example_single_file.cpp
+        echo '#define IMGUI_USE_WCHAR32'                       >  example_single_file.cpp
         echo '#define IMGUI_IMPLEMENTATION'                    >> example_single_file.cpp
         echo '#include "misc/single_file/imgui_single_file.h"' >> example_single_file.cpp
         echo '#include "examples/example_null/main.cpp"'       >> example_single_file.cpp

docs/CHANGELOG.txt

@@ -49,7 +49,7 @@ Other Changes:
   cursor position. This would often get fixed after the fix item submission, but using the
   ImGuiListClipper as the first thing after Begin() could largely break size calculations. (#3073)
 - Added optional support for Unicode plane 1-16 (#2538, #2541, #2815) [@cloudwu, @samhocevar]
-  - Compile-time enable with '#define ImWchar ImWchar32' in imconfig.h.
+  - Compile-time enable with '#define IMGUI_USE_WCHAR32' in imconfig.h.
   - Generally more consistent support for unsupported codepoints (0xFFFD), in particular when
     using the default, non-fitting characters will be turned into 0xFFFD instead of being ignored.
   - Surrogate pairs are supported when submitting UTF-16 data via io.AddInputCharacterUTF16(),

imconfig.h

@@ -48,6 +48,9 @@
 //---- Pack colors to BGRA8 instead of RGBA8 (to avoid converting from one to another)
 //#define IMGUI_USE_BGRA_PACKED_COLOR
 
+//---- Use 32-bit for ImWchar (default is 16-bit) to support full unicode code points.
+//#define IMGUI_USE_WCHAR32
+
 //---- Avoid multiple STB libraries implementations, or redefine path/filenames to prioritize another version
 // 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"
@@ -77,9 +80,6 @@
 // Read about ImGuiBackendFlags_RendererHasVtxOffset for details.
 //#define ImDrawIdx unsigned int
 
-//---- Use 32-bit for ImWchar (default is 16-bit) to support full unicode code points.
-//#define ImWchar ImWchar32
-
 //---- Override ImDrawCallback signature (will need to modify renderer back-ends accordingly)
 //struct ImDrawList;
 //struct ImDrawCmd;

imgui.cpp

@@ -5,6 +5,7 @@
 // - Read FAQ at http://dearimgui.org/faq
 // - Newcomers, read 'Programmer guide' below for notes on how to setup Dear ImGui in your codebase.
 // - Call and read ImGui::ShowDemoWindow() in imgui_demo.cpp for demo code. All applications in examples/ are doing that.
+// Read imgui.cpp for details, links and comments.
 
 // Resources:
 // - FAQ                   http://dearimgui.org/faq

imgui.h

@@ -5,7 +5,7 @@
 // - Read FAQ at http://dearimgui.org/faq
 // - Newcomers, read 'Programmer guide' in imgui.cpp for notes on how to setup Dear ImGui in your codebase.
 // - Call and read ImGui::ShowDemoWindow() in imgui_demo.cpp for demo code. All applications in examples/ are doing that.
-// Read imgui.cpp for more details, documentation and comments.
+// Read imgui.cpp for details, links and comments.
 
 // Resources:
 // - FAQ                   http://dearimgui.org/faq
@@ -65,7 +65,7 @@ Index of this file:
 
 // Define attributes of all API symbols declarations (e.g. for DLL under Windows)
 // IMGUI_API is used for core imgui functions, IMGUI_IMPL_API is used for the default bindings files (imgui_impl_xxx.h)
-// Using dear imgui via a shared library is not recommended, because of function call overhead and because we don't guarantee backward nor forward ABI compatibility.
+// Using dear imgui via a shared library is not recommended, because we don't guarantee backward nor forward ABI compatibility (also function call overhead, as dear imgui is a call-heavy API)
 #ifndef IMGUI_API
 #define IMGUI_API
 #endif
@@ -170,18 +170,23 @@ typedef int ImGuiTreeNodeFlags;     // -> enum ImGuiTreeNodeFlags_   // Flags: f
 typedef int ImGuiWindowFlags;       // -> enum ImGuiWindowFlags_     // Flags: for Begin(), BeginChild()
 
 // Other types
-#ifndef ImTextureID                 // ImTextureID [configurable type: override in imconfig.h]
+#ifndef ImTextureID                 // ImTextureID [configurable type: override in imconfig.h with '#define ImTextureID xxx']
 typedef void* ImTextureID;          // User data for rendering back-end to identify a texture. This is whatever to you want it to be! read the FAQ about ImTextureID for details.
 #endif
-#ifndef ImWchar                     // ImWchar [configurable type: override in imconfig.h]
-#define ImWchar ImWchar16           // Storage for a single decoded character/code point, default to 16-bit. Set to ImWchar32 to support larger Unicode planes. Note that we generally support UTF-8 encoded string, this is storage for a decoded character.
-#endif
 typedef unsigned int ImGuiID;       // A unique ID used by widgets, typically hashed from a stack of string.
-typedef unsigned short ImWchar16;   // A single decoded U16 character/code point for keyboard input/display. We encode them as multi bytes UTF-8 when used in strings.
-typedef unsigned int ImWchar32;     // A single decoded U32 character/code point for keyboard input/display. To enable, use '#define ImWchar ImWchar32' in imconfig.h.
 typedef int (*ImGuiInputTextCallback)(ImGuiInputTextCallbackData *data);
 typedef void (*ImGuiSizeCallback)(ImGuiSizeCallbackData* data);
 
+// Decoded character types
+// (we generally use UTF-8 encoded string in the API. This is storage specifically for a decoded character used for keyboard input and display)
+typedef unsigned short ImWchar16;   // A single decoded U16 character/code point. We encode them as multi bytes UTF-8 when used in strings.
+typedef unsigned int ImWchar32;     // A single decoded U32 character/code point. We encode them as multi bytes UTF-8 when used in strings.
+#ifdef IMGUI_USE_WCHAR32            // ImWchar [configurable type: override in imconfig.h with '#define IMGUI_USE_WCHAR32' to support Unicode planes 1-16]
+typedef ImWchar32 ImWchar;
+#else
+typedef ImWchar16 ImWchar;
+#endif
+
 // Basic scalar data types
 typedef signed char         ImS8;   // 8-bit signed integer
 typedef unsigned char       ImU8;   // 8-bit unsigned integer