Merge branch 'master' into docking

.github/workflows/build.yml

@@ -51,15 +51,11 @@ jobs:
       - name: Build example_null (mingw 64-bit, as DLL)
         shell: bash
         run: |
-          echo '#ifdef _EXPORT'                                  >  example_single_file.cpp
+          echo '#define IMGUI_API __declspec(dllexport)'         >  example_single_file.cpp
-          echo '#  define IMGUI_API __declspec(dllexport)'       >> example_single_file.cpp
-          echo '#else'                                           >> example_single_file.cpp
-          echo '#  define IMGUI_API __declspec(dllimport)'       >> example_single_file.cpp
-          echo '#endif'                                          >> 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
-          g++ -I. -Wall -Wformat -D_EXPORT -shared -o libimgui.dll -Wl,--out-implib,libimgui.a example_single_file.cpp -limm32
+          g++ -I. -Wall -Wformat -shared -o libimgui.dll -Wl,--out-implib,libimgui.a example_single_file.cpp -limm32
-          g++ -I. -Wall -Wformat -o example_null.exe examples/example_null/main.cpp -L. -limgui
+          g++ -I. -Wall -Wformat -DIMGUI_API='__declspec(dllimport)' -o example_null.exe examples/example_null/main.cpp -L. -limgui
           rm -f example_null.exe libimgui.* example_single_file.*
 
       - name: Build example_null (extra warnings, msvc 64-bit)
@@ -99,16 +95,12 @@ jobs:
         run: |
           call "%VS_PATH%\VC\Auxiliary\Build\vcvars64.bat"
 
-          echo #ifdef _EXPORT                                  >  example_single_file.cpp
+          echo #define IMGUI_API __declspec(dllexport)         >  example_single_file.cpp
-          echo #  define IMGUI_API __declspec(dllexport)       >> example_single_file.cpp
-          echo #else                                           >> example_single_file.cpp
-          echo #  define IMGUI_API __declspec(dllimport)       >> example_single_file.cpp
-          echo #endif                                          >> 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
 
-          cl.exe /D_USRDLL /D_WINDLL /D_EXPORT /I. example_single_file.cpp /LD /FeImGui.dll /link
+          cl.exe /D_USRDLL /D_WINDLL /I. example_single_file.cpp /LD /FeImGui.dll /link
-          cl.exe /I. ImGui.lib /Feexample_null.exe examples/example_null/main.cpp
+          cl.exe /DIMGUI_API=__declspec(dllimport) /I. ImGui.lib /Feexample_null.exe examples/example_null/main.cpp
 
       - name: Build Win32 example_glfw_opengl2
         shell: cmd

backends/imgui_impl_sdl2.cpp

@@ -128,6 +128,9 @@
 #ifdef __EMSCRIPTEN__
 #include <emscripten/em_js.h>
 #endif
+#ifdef Status // X11 headers
+#undef Status
+#endif
 
 #if SDL_VERSION_ATLEAST(2,0,4) && !defined(__EMSCRIPTEN__) && !defined(__ANDROID__) && !(defined(__APPLE__) && TARGET_OS_IOS) && !defined(__amigaos4__)
 #define SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE    1

docs/CHANGELOG.txt

@@ -43,6 +43,17 @@ Breaking changes:
 
 Other changes:
 
+- Fonts: added ImFontAtlas::SetFontLoader() to dynamically change font
+  loader at runtime without using internal API. (#8752, #8465)
+- Fonts: for large size fonts, layout/size calculation only load glyphs metrics.
+  Actual glyphs are renderer+packed when used by drawing functions. (#8758, #8465)
+- Fonts: set a maximum font size of 512.0f at ImGui:: API level to reduce
+  edge cases (e.g. out of memory errors). ImDrawList:: API doesn't have the
+  constraint. (#8758)
+- Textures: Fixed support for `#define ImTextureID_Invalid` to non-zero value:
+  ImTextureData() was incorrectly cleared with zeroes. (#8745) [@rachit7645]
+- Demo: Added "Text -> Font Size" demo section. (#8738) [@Demonese]
+- CI: Fixed dllimport/dllexport tests. (#8757) [@AidanSun05]
 - Backends: SDL3: avoid calling SDL_StartTextInput() again if already active.
   (#8727) [@morrazzzz]
 - Backends: OSX: added ImGuiMouseCursor_Wait and ImGuiMouseCursor_Progress
@@ -116,13 +127,11 @@ Breaking changes:
      `PushFont(NULL, some_size)` now keeps current change and changes size.
    - Renamed/moved 'io.FontGlobalScale' to 'style.FontScaleMain'.
 - Fonts: **IMPORTANT** on Font Merging:
-  - When searching for a glyph in multiple merged fonts: font inputs are now scanned in order
+  - When searching for a glyph in multiple merged fonts: we search for the FIRST font source
-    for the first font input which the desired glyph. This is technically a different behavior
+    which contains the desired glyph. Because the user doesn't need to provide glyph ranges
-    than before!
+    any more, it is possible that a glyph that you expected to fetch from a secondary/merged
-  - e.g. If you are merging fonts you may have glyphs that you expected to load from
+    icon font may be erroneously fetched from the primary font.
-    Font Source 2 which exists in Font Source 1. After the update and when using a new backend,
+  - We added `ImFontConfig::GlyphExcludeRanges[]` to specify ranges to exclude from a given font source:
-    those glyphs may now loaded from Font Source 1!
-  - You can use `ImFontConfig::GlyphExcludeRanges[]` to specify ranges to ignore in given Input:
         // Add Font Source 1 but ignore ICON_MIN_FA..ICON_MAX_FA range
         static ImWchar exclude_ranges[] = { ICON_MIN_FA, ICON_MAX_FA, 0 };
         ImFontConfig cfg1;
@@ -211,7 +220,7 @@ Breaking changes:
      - renamed/reworked ImFontBuilderIO into ImFontLoader,
      - renamed ImGuiFreeType::GetBuilderForFreeType() to ImGuiFreeType::GetFontLoader()
        - old:  io.Fonts->FontBuilderIO = ImGuiFreeType::GetBuilderForFreeType()
-       - new:  io.Fonts.FontLoader = ImGuiFreeType::GetFontLoader();
+       - new:  io.Fonts->FontLoader = ImGuiFreeType::GetFontLoader()
 - DrawList: Renamed ImDrawList::PushTextureID()/PopTextureID() to PushTexture()/PopTexture().
 - Fonts: (users of custom rectangles)
   - Renamed AddCustomRectRegular() to AddCustomRect(). (#8466)

docs/FONTS.md

@@ -387,7 +387,7 @@ io.Fonts->AddFontFromFileTTF("C:\\Windows\\Fonts\\seguiemj.ttf", 16.0f, &cfg);
 
 ## Using Custom Glyph Ranges
 
-🆕 **Since 1.92, with an up to date backend: specifying glyph ranges is necessary, so this is not needed.**
+🆕 **Since 1.92, with an up to date backend: specifying glyph ranges is unnecessary. Therefore this is not really useful any more.**
 
 :rewind: 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.
 ```cpp

imgui.cpp

@@ -426,9 +426,12 @@ IMPLEMENTING SUPPORT for ImGuiBackendFlags_RendererHasTextures:
                          - To use old behavior: use 'ImGui::PushFont(font, font->LegacySize)' at call site.
                          - Kept inline single parameter function. Will obsolete.
                        - Fonts: **IMPORTANT** on Font Merging:
-                         - When searching for a glyph in multiple merged fonts: font inputs are now scanned in orderfor the first font input which the desired glyph. This is technically a different behavior than before!
+                         - When searching for a glyph in multiple merged fonts: we search for the FIRST font source which contains the desired glyph.
-                         - e.g. If you are merging fonts you may have glyphs that you expected to load from Font Source 2 which exists in Font Source 1. After the update and when using a new backend, those glyphs may now loaded from Font Source 1!
+                           Because the user doesn't need to provide glyph ranges any more, it is possible that a glyph that you expected to fetch from a secondary/merged icon font may be erroneously fetched from the primary font.
-                         - You can use `ImFontConfig::GlyphExcludeRanges[]` to specify ranges to ignore in given Input:
+                         - When searching for a glyph in multiple merged fonts: we now search for the FIRST font source which contains the desired glyph. This is technically a different behavior than before!
+                         - e.g. If you are merging fonts you may have glyphs that you expected to load from Font Source 2 which exists in Font Source 1.
+                           After the update and when using a new backend, those glyphs may now loaded from Font Source 1!
+                         - We added `ImFontConfig::GlyphExcludeRanges[]` to specify ranges to exclude from a given font source:
                              // Add Font Source 1 but ignore ICON_MIN_FA..ICON_MAX_FA range
                              static ImWchar exclude_ranges[] = { ICON_MIN_FA, ICON_MAX_FA, 0 };
                              ImFontConfig cfg1;
@@ -460,7 +463,8 @@ IMPLEMENTING SUPPORT for ImGuiBackendFlags_RendererHasTextures:
                        - Fonts: (users of imgui_freetype): renamed ImFontAtlas::FontBuilderFlags to ImFontAtlas::FontLoaderFlags. Renamed ImFontConfig::FontBuilderFlags to ImFontConfig::FontLoaderFlags. Renamed ImGuiFreeTypeBuilderFlags to ImGuiFreeTypeLoaderFlags.
                          If you used runtime imgui_freetype selection rather than the default IMGUI_ENABLE_FREETYPE compile-time option: Renamed/reworked ImFontBuilderIO into ImFontLoader. Renamed ImGuiFreeType::GetBuilderForFreeType() to ImGuiFreeType::GetFontLoader().
                            - old:  io.Fonts->FontBuilderIO = ImGuiFreeType::GetBuilderForFreeType()
-                           - new:  io.Fonts.FontLoader = ImGuiFreeType::GetFontLoader()
+                           - new:  io.Fonts->FontLoader = ImGuiFreeType::GetFontLoader()
+                           - new:  io.Fonts->SetFontLoader(ImGuiFreeType::GetFontLoader()) to change dynamically at runtime [from 1.92.1]
                        - Fonts: (users of custom rectangles, see #8466): Renamed AddCustomRectRegular() to AddCustomRect(). Added GetCustomRect() as a replacement for GetCustomRectByIndex() + CalcCustomRectUV().
                            - The output type of GetCustomRect() is now ImFontAtlasRect, which include UV coordinates. X->x, Y->y, Width->w, Height->h.
                            - old:
@@ -9431,7 +9435,7 @@ void ImGui::UpdateCurrentFontSize(float restore_font_size_after_scaling)
     // - We started rounding in 1.90 WIP (18991) as our layout system currently doesn't support non-rounded font size well yet.
     // - We may support it better later and remove this rounding.
     final_size = GetRoundedFontSize(final_size);
-    final_size = ImMax(1.0f, final_size);
+    final_size = ImClamp(final_size, 1.0f, IMGUI_FONT_SIZE_MAX);
     if (g.Font != NULL && (g.IO.BackendFlags & ImGuiBackendFlags_RendererHasTextures))
         g.Font->CurrentRasterizerDensity = g.FontRasterizerDensity;
     g.FontSize = final_size;
@@ -21529,9 +21533,9 @@ void ImGui::ShowFontAtlas(ImFontAtlas* atlas)
         style._NextFrameFontSizeBase = style.FontSizeBase; // FIXME: Temporary hack until we finish remaining work.
     SameLine(0.0f, 0.0f); Text(" (out %.2f)", GetFontSize());
     SameLine(); MetricsHelpMarker("- This is scaling font only. General scaling will come later.");
-    DragFloat("FontScaleMain", &style.FontScaleMain, 0.02f, 0.5f, 5.0f);
+    DragFloat("FontScaleMain", &style.FontScaleMain, 0.02f, 0.5f, 4.0f);
     //BeginDisabled(io.ConfigDpiScaleFonts);
-    DragFloat("FontScaleDpi", &style.FontScaleDpi, 0.02f, 0.5f, 5.0f);
+    DragFloat("FontScaleDpi", &style.FontScaleDpi, 0.02f, 0.5f, 4.0f);
     //SetItemTooltip("When io.ConfigDpiScaleFonts is set, this value is automatically overwritten.");
     //EndDisabled();
     if ((io.BackendFlags & ImGuiBackendFlags_RendererHasTextures) == 0)
@@ -21561,7 +21565,7 @@ void ImGui::ShowFontAtlas(ImFontAtlas* atlas)
 #ifdef IMGUI_ENABLE_STB_TRUETYPE
         const ImFontLoader* loader_stbtruetype = ImFontAtlasGetFontLoaderForStbTruetype();
         if (RadioButton("stb_truetype", loader_current == loader_stbtruetype))
-            ImFontAtlasBuildSetupFontLoader(atlas, loader_stbtruetype);
+            atlas->SetFontLoader(loader_stbtruetype);
 #else
         BeginDisabled();
         RadioButton("stb_truetype", false);
@@ -21572,7 +21576,7 @@ void ImGui::ShowFontAtlas(ImFontAtlas* atlas)
 #ifdef IMGUI_ENABLE_FREETYPE
         const ImFontLoader* loader_freetype = ImGuiFreeType::GetFontLoader();
         if (RadioButton("FreeType", loader_current == loader_freetype))
-            ImFontAtlasBuildSetupFontLoader(atlas, loader_freetype);
+            atlas->SetFontLoader(loader_freetype);
         if (loader_current == loader_freetype)
         {
             unsigned int loader_flags = atlas->FontLoaderFlags;

imgui.h

@@ -3560,7 +3560,7 @@ struct ImTextureData
     bool                WantDestroyNextFrame;   // rw   -   // [Internal] Queued to set ImTextureStatus_WantDestroy next frame. May still be used in the current frame.
 
     // Functions
-    ImTextureData()     { memset(this, 0, sizeof(*this)); }
+    ImTextureData()     { memset(this, 0, sizeof(*this)); TexID = ImTextureID_Invalid; }
     ~ImTextureData()    { DestroyPixels(); }
     IMGUI_API void      Create(ImTextureFormat format, int w, int h);
     IMGUI_API void      DestroyPixels();
@@ -3613,7 +3613,7 @@ struct ImFontConfig
     // [Internal]
     ImFontFlags     Flags;                  // Font flags (don't use just yet, will be exposed in upcoming 1.92.X updates)
     ImFont*         DstFont;                // Target font (as we merging fonts, multiple ImFontConfig may target the same font)
-    const ImFontLoader* FontLoader;         // Custom font backend for this source (other use one stored in ImFontAtlas)
+    const ImFontLoader* FontLoader;         // Custom font backend for this source (default source is the one stored in ImFontAtlas)
     void*           FontLoaderData;         // Font loader opaque storage (per font config)
 
     IMGUI_API ImFontConfig();
@@ -3710,6 +3710,7 @@ struct ImFontAtlas
 
     IMGUI_API void              Clear();                    // Clear everything (input fonts, output glyphs/textures)
     IMGUI_API void              CompactCache();             // Compact cached glyphs and texture.
+    IMGUI_API void              SetFontLoader(const ImFontLoader* font_loader); // Change font loader at runtime.
 
     // As we are transitioning toward a new font system, we expect to obsolete those soon:
     IMGUI_API void              ClearInputData();           // [OBSOLETE] Clear input data (all ImFontConfig structures including sizes, TTF data, glyph ranges, etc.) = all the data used to build the texture and fonts.
@@ -3818,7 +3819,7 @@ struct ImFontAtlas
     int                         FontNextUniqueID;   // Next value to be stored in ImFont->FontID
     ImVector<ImDrawListSharedData*> DrawListSharedDatas; // List of users for this atlas. Typically one per Dear ImGui context.
     ImFontAtlasBuilder*         Builder;            // Opaque interface to our data that doesn't need to be public and may be discarded when rebuilding.
-    const ImFontLoader*         FontLoader;         // Font loader opaque interface (default to stb_truetype, can be changed to use FreeType by defining IMGUI_ENABLE_FREETYPE). Don't set directly!
+    const ImFontLoader*         FontLoader;         // Font loader opaque interface (default to use FreeType when IMGUI_ENABLE_FREETYPE is defined, otherwise default to use stb_truetype). Use SetFontLoader() to change this at runtime.
     const char*                 FontLoaderName;     // Font loader name (for display e.g. in About box) == FontLoader->Name
     void*                       FontLoaderData;     // Font backend opaque storage
     unsigned int                FontLoaderFlags;    // Shared flags (for all fonts) for font loader. THIS IS BUILD IMPLEMENTATION DEPENDENT (e.g. Per-font override is also available in ImFontConfig).

imgui_demo.cpp

@@ -8384,7 +8384,7 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
         SameLine(0.0f, 0.0f); Text(" (out %.2f)", GetFontSize());
         DragFloat("FontScaleMain", &style.FontScaleMain, 0.02f, 0.5f, 4.0f);
         //BeginDisabled(GetIO().ConfigDpiScaleFonts);
-        DragFloat("FontScaleDpi", &style.FontScaleDpi, 0.02f, 0.5f, 5.0f);
+        DragFloat("FontScaleDpi", &style.FontScaleDpi, 0.02f, 0.5f, 4.0f);
         //SetItemTooltip("When io.ConfigDpiScaleFonts is set, this value is automatically overwritten.");
         //EndDisabled();
 

imgui_draw.cpp

@@ -2566,6 +2566,7 @@ void ImTextureData::DestroyPixels()
 //-----------------------------------------------------------------------------
 // - ImFontBaked_BuildGrowIndex()
 // - ImFontBaked_BuildLoadGlyph()
+// - ImFontBaked_BuildLoadGlyphAdvanceX()
 // - ImFontAtlasDebugLogTextureRequests()
 //-----------------------------------------------------------------------------
 // - ImFontAtlasGetFontLoaderForStbTruetype()
@@ -2665,6 +2666,11 @@ void ImFontAtlas::CompactCache()
     ImFontAtlasTextureCompact(this);
 }
 
+void ImFontAtlas::SetFontLoader(const ImFontLoader* font_loader)
+{
+    ImFontAtlasBuildSetupFontLoader(this, font_loader);
+}
+
 void ImFontAtlas::ClearInputData()
 {
     IM_ASSERT(!Locked && "Cannot modify a locked ImFontAtlas!");
@@ -4184,9 +4190,9 @@ void ImFontAtlasBuildInit(ImFontAtlas* atlas)
     if (atlas->FontLoader == NULL)
     {
 #ifdef IMGUI_ENABLE_FREETYPE
-        ImFontAtlasBuildSetupFontLoader(atlas, ImGuiFreeType::GetFontLoader());
+        atlas->SetFontLoader(ImGuiFreeType::GetFontLoader());
 #elif defined(IMGUI_ENABLE_STB_TRUETYPE)
-        ImFontAtlasBuildSetupFontLoader(atlas, ImFontAtlasGetFontLoaderForStbTruetype());
+        atlas->SetFontLoader(ImFontAtlasGetFontLoaderForStbTruetype());
 #else
         IM_ASSERT(0); // Invalid Build function
 #endif
@@ -4410,7 +4416,7 @@ static void ImFontAtlas_FontHookRemapCodepoint(ImFontAtlas* atlas, ImFont* font,
         *c = (ImWchar)font->RemapPairs.GetInt((ImGuiID)*c, (int)*c);
 }
 
-static ImFontGlyph* ImFontBaked_BuildLoadGlyph(ImFontBaked* baked, ImWchar codepoint)
+static ImFontGlyph* ImFontBaked_BuildLoadGlyph(ImFontBaked* baked, ImWchar codepoint, float* only_load_advance_x)
 {
     ImFont* font = baked->ContainerFont;
     ImFontAtlas* atlas = font->ContainerAtlas;
@@ -4443,13 +4449,25 @@ static ImFontGlyph* ImFontBaked_BuildLoadGlyph(ImFontBaked* baked, ImWchar codep
         const ImFontLoader* loader = src->FontLoader ? src->FontLoader : atlas->FontLoader;
         if (!src->GlyphExcludeRanges || ImFontAtlasBuildAcceptCodepointForSource(src, codepoint))
         {
-            ImFontGlyph glyph_buf;
+            if (only_load_advance_x == NULL)
-            if (loader->FontBakedLoadGlyph(atlas, src, baked, loader_user_data_p, codepoint, &glyph_buf))
             {
-                // FIXME: Add hooks for e.g. #7962
+                ImFontGlyph glyph_buf;
-                glyph_buf.Codepoint = src_codepoint;
+                if (loader->FontBakedLoadGlyph(atlas, src, baked, loader_user_data_p, codepoint, &glyph_buf, NULL))
-                glyph_buf.SourceIdx = src_n;
+                {
-                return ImFontAtlasBakedAddFontGlyph(atlas, baked, src, &glyph_buf);
+                    // FIXME: Add hooks for e.g. #7962
+                    glyph_buf.Codepoint = src_codepoint;
+                    glyph_buf.SourceIdx = src_n;
+                    return ImFontAtlasBakedAddFontGlyph(atlas, baked, src, &glyph_buf);
+                }
+            }
+            else
+            {
+                // Special mode but only loading glyphs metrics. Will rasterize and pack later.
+                if (loader->FontBakedLoadGlyph(atlas, src, baked, loader_user_data_p, codepoint, NULL, only_load_advance_x))
+                {
+                    ImFontAtlasBakedAddFontGlyphAdvancedX(atlas, baked, src, codepoint, *only_load_advance_x);
+                    return NULL;
+                }
             }
         }
         loader_user_data_p += loader->FontBakedSrcLoaderDataSize;
@@ -4469,12 +4487,27 @@ static ImFontGlyph* ImFontBaked_BuildLoadGlyph(ImFontBaked* baked, ImWchar codep
     return NULL;
 }
 
+static float ImFontBaked_BuildLoadGlyphAdvanceX(ImFontBaked* baked, ImWchar codepoint)
+{
+    if (baked->Size >= IMGUI_FONT_SIZE_THRESHOLD_FOR_LOADADVANCEXONLYMODE)
+    {
+        // First load AdvanceX value used by CalcTextSize() API then load the rest when loaded by drawing API.
+        float only_advance_x = 0.0f;
+        ImFontGlyph* glyph = ImFontBaked_BuildLoadGlyph(baked, (ImWchar)codepoint, &only_advance_x);
+        return glyph ? glyph->AdvanceX : only_advance_x;
+    }
+    else
+    {
+        ImFontGlyph* glyph = ImFontBaked_BuildLoadGlyph(baked, (ImWchar)codepoint, NULL);
+        return glyph ? glyph->AdvanceX : baked->FallbackAdvanceX;
+    }
+}
+
 // The point of this indirection is to not be inlined in debug mode in order to not bloat inner loop.b
 IM_MSVC_RUNTIME_CHECKS_OFF
 static float BuildLoadGlyphGetAdvanceOrFallback(ImFontBaked* baked, unsigned int codepoint)
 {
-    ImFontGlyph* glyph = ImFontBaked_BuildLoadGlyph(baked, (ImWchar)codepoint);
+    return ImFontBaked_BuildLoadGlyphAdvanceX(baked, (ImWchar)codepoint);
-    return glyph ? glyph->AdvanceX : baked->FallbackAdvanceX;
 }
 IM_MSVC_RUNTIME_CHECKS_RESTORE
 
@@ -4595,7 +4628,7 @@ static bool ImGui_ImplStbTrueType_FontBakedInit(ImFontAtlas* atlas, ImFontConfig
     return true;
 }
 
-static bool ImGui_ImplStbTrueType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void*, ImWchar codepoint, ImFontGlyph* out_glyph)
+static bool ImGui_ImplStbTrueType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void*, ImWchar codepoint, ImFontGlyph* out_glyph, float* out_advance_x)
 {
     // Search for first font which has the glyph
     ImGui_ImplStbTrueType_FontSrcData* bd_font_data = (ImGui_ImplStbTrueType_FontSrcData*)src->FontLoaderData;
@@ -4617,7 +4650,14 @@ static bool ImGui_ImplStbTrueType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontC
     int advance, lsb;
     stbtt_GetGlyphBitmapBoxSubpixel(&bd_font_data->FontInfo, glyph_index, scale_for_raster_x, scale_for_raster_y, 0, 0, &x0, &y0, &x1, &y1);
     stbtt_GetGlyphHMetrics(&bd_font_data->FontInfo, glyph_index, &advance, &lsb);
-    const bool is_visible = (x0 != x1 && y0 != y1);
+
+    // Load metrics only mode
+    if (out_advance_x != NULL)
+    {
+        IM_ASSERT(out_glyph == NULL);
+        *out_advance_x = advance * scale_for_layout;
+        return true;
+    }
 
     // Prepare glyph
     out_glyph->Codepoint = codepoint;
@@ -4625,6 +4665,7 @@ static bool ImGui_ImplStbTrueType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontC
 
     // Pack and retrieve position inside texture atlas
     // (generally based on stbtt_PackFontRangesRenderIntoRects)
+    const bool is_visible = (x0 != x1 && y0 != y1);
     if (is_visible)
     {
         const int w = (x1 - x0 + oversample_h - 1);
@@ -5125,6 +5166,29 @@ ImFontGlyph* ImFontAtlasBakedAddFontGlyph(ImFontAtlas* atlas, ImFontBaked* baked
     return glyph;
 }
 
+// FIXME: Code is duplicated with code above.
+void ImFontAtlasBakedAddFontGlyphAdvancedX(ImFontAtlas* atlas, ImFontBaked* baked, ImFontConfig* src, ImWchar codepoint, float advance_x)
+{
+    IM_UNUSED(atlas);
+    if (src != NULL)
+    {
+        // Clamp & recenter if needed
+        const float ref_size = baked->ContainerFont->Sources[0]->SizePixels;
+        const float offsets_scale = (ref_size != 0.0f) ? (baked->Size / ref_size) : 1.0f;
+        advance_x = ImClamp(advance_x, src->GlyphMinAdvanceX * offsets_scale, src->GlyphMaxAdvanceX * offsets_scale);
+
+        // Snap to pixel
+        if (src->PixelSnapH)
+            advance_x = IM_ROUND(advance_x);
+
+        // Bake spacing
+        advance_x += src->GlyphExtraAdvanceX;
+    }
+
+    ImFontBaked_BuildGrowIndex(baked, codepoint + 1);
+    baked->IndexAdvanceX[codepoint] = advance_x;
+}
+
 // Copy to texture, post-process and queue update for backend
 void ImFontAtlasBakedSetFontGlyphBitmap(ImFontAtlas* atlas, ImFontBaked* baked, ImFontConfig* src, ImFontGlyph* glyph, ImTextureRect* r, const unsigned char* src_pixels, ImTextureFormat src_fmt, int src_pitch)
 {
@@ -5152,7 +5216,7 @@ ImFontGlyph* ImFontBaked::FindGlyph(ImWchar c)
         if (i != IM_FONTGLYPH_INDEX_UNUSED)
             return &Glyphs.Data[i];
     }
-    ImFontGlyph* glyph = ImFontBaked_BuildLoadGlyph(this, c);
+    ImFontGlyph* glyph = ImFontBaked_BuildLoadGlyph(this, c, NULL);
     return glyph ? glyph : &Glyphs.Data[FallbackGlyphIndex];
 }
 
@@ -5168,7 +5232,7 @@ ImFontGlyph* ImFontBaked::FindGlyphNoFallback(ImWchar c)
             return &Glyphs.Data[i];
     }
     LockLoadingFallback = true; // This is actually a rare call, not done in hot-loop, so we prioritize not adding extra cruft to ImFontBaked_BuildLoadGlyph() call sites.
-    ImFontGlyph* glyph = ImFontBaked_BuildLoadGlyph(this, c);
+    ImFontGlyph* glyph = ImFontBaked_BuildLoadGlyph(this, c, NULL);
     LockLoadingFallback = false;
     return glyph;
 }
@@ -5211,10 +5275,7 @@ float ImFontBaked::GetCharAdvance(ImWchar c)
         if (x >= 0.0f)
             return x;
     }
-
+    return ImFontBaked_BuildLoadGlyphAdvanceX(this, c);
-    // Same as BuildLoadGlyphGetAdvanceOrFallback():
-    const ImFontGlyph* glyph = ImFontBaked_BuildLoadGlyph(this, c);
-    return glyph ? glyph->AdvanceX : FallbackAdvanceX;
 }
 IM_MSVC_RUNTIME_CHECKS_RESTORE
 

imgui_internal.h

@@ -3215,7 +3215,7 @@ struct IMGUI_API ImGuiTable
     bool                        IsSortSpecsDirty;
     bool                        IsUsingHeaders;             // Set when the first row had the ImGuiTableRowFlags_Headers flag.
     bool                        IsContextPopupOpen;         // Set when default context menu is open (also see: ContextPopupColumn, InstanceInteracted).
-    bool                        DisableDefaultContextMenu;  // Disable default context menu contents. You may submit your own using TableBeginContextMenuPopup()/EndPopup()
+    bool                        DisableDefaultContextMenu;  // Disable default context menu. You may submit your own using TableBeginContextMenuPopup()/EndPopup()
     bool                        IsSettingsRequestLoad;
     bool                        IsSettingsDirty;            // Set when table settings have changed and needs to be reported into ImGuiTableSetttings data.
     bool                        IsDefaultDisplayOrder;      // Set when display order is unchanged from default (DisplayOrder contains 0...Count-1)
@@ -3989,7 +3989,7 @@ struct ImFontLoader
     bool            (*FontSrcContainsGlyph)(ImFontAtlas* atlas, ImFontConfig* src, ImWchar codepoint);
     bool            (*FontBakedInit)(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void* loader_data_for_baked_src);
     void            (*FontBakedDestroy)(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void* loader_data_for_baked_src);
-    bool            (*FontBakedLoadGlyph)(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void* loader_data_for_baked_src, ImWchar codepoint, ImFontGlyph* out_glyph);
+    bool            (*FontBakedLoadGlyph)(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void* loader_data_for_baked_src, ImWchar codepoint, ImFontGlyph* out_glyph, float* out_advance_x);
 
     // Size of backend data, Per Baked * Per Source. Buffers are managed by core to avoid excessive allocations.
     // FIXME: At this point the two other types of buffers may be managed by core to be consistent?
@@ -4009,6 +4009,9 @@ typedef ImFontLoader ImFontBuilderIO; // [renamed/changed in 1.92] The types are
 // [SECTION] ImFontAtlas internal API
 //-----------------------------------------------------------------------------
 
+#define IMGUI_FONT_SIZE_MAX                                     (512.0f)
+#define IMGUI_FONT_SIZE_THRESHOLD_FOR_LOADADVANCEXONLYMODE      (128.0f)
+
 // Helpers: ImTextureRef ==/!= operators provided as convenience
 // (note that _TexID and _TexData are never set simultaneously)
 inline bool operator==(const ImTextureRef& lhs, const ImTextureRef& rhs)    { return lhs._TexID == rhs._TexID && lhs._TexData == rhs._TexData; }
@@ -4125,6 +4128,7 @@ IMGUI_API ImFontBaked*      ImFontAtlasBakedGetClosestMatch(ImFontAtlas* atlas,
 IMGUI_API ImFontBaked*      ImFontAtlasBakedAdd(ImFontAtlas* atlas, ImFont* font, float font_size, float font_rasterizer_density, ImGuiID baked_id);
 IMGUI_API void              ImFontAtlasBakedDiscard(ImFontAtlas* atlas, ImFont* font, ImFontBaked* baked);
 IMGUI_API ImFontGlyph*      ImFontAtlasBakedAddFontGlyph(ImFontAtlas* atlas, ImFontBaked* baked, ImFontConfig* src, const ImFontGlyph* in_glyph);
+IMGUI_API void              ImFontAtlasBakedAddFontGlyphAdvancedX(ImFontAtlas* atlas, ImFontBaked* baked, ImFontConfig* src, ImWchar codepoint, float advance_x);
 IMGUI_API void              ImFontAtlasBakedDiscardFontGlyph(ImFontAtlas* atlas, ImFont* font, ImFontBaked* baked, ImFontGlyph* glyph);
 IMGUI_API void              ImFontAtlasBakedSetFontGlyphBitmap(ImFontAtlas* atlas, ImFontBaked* baked, ImFontConfig* src, ImFontGlyph* glyph, ImTextureRect* r, const unsigned char* src_pixels, ImTextureFormat src_fmt, int src_pitch);
 

imgui_tables.cpp

@@ -1251,7 +1251,7 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
 
     // [Part 11] Default context menu
     // - To append to this menu: you can call TableBeginContextMenuPopup()/.../EndPopup().
-    // - To modify or replace this: set table->IsContextPopupNoDefaultContents = true, then call TableBeginContextMenuPopup()/.../EndPopup().
+    // - To modify or replace this: set table->DisableDefaultContextMenu = true, then call TableBeginContextMenuPopup()/.../EndPopup().
     // - You may call TableDrawDefaultContextMenu() with selected flags to display specific sections of the default menu,
     //   e.g. TableDrawDefaultContextMenu(table, table->Flags & ~ImGuiTableFlags_Hideable) will display everything EXCEPT columns visibility options.
     if (table->DisableDefaultContextMenu == false && TableBeginContextMenuPopup(table))

misc/freetype/imgui_freetype.cpp

@@ -475,7 +475,7 @@ void ImGui_ImplFreeType_FontBakedDestroy(ImFontAtlas* atlas, ImFontConfig* src,
     bd_baked_data->~ImGui_ImplFreeType_FontSrcBakedData(); // ~IM_PLACEMENT_DELETE()
 }
 
-bool ImGui_ImplFreeType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void* loader_data_for_baked_src, ImWchar codepoint, ImFontGlyph* out_glyph)
+bool ImGui_ImplFreeType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void* loader_data_for_baked_src, ImWchar codepoint, ImFontGlyph* out_glyph, float* out_advance_x)
 {
     ImGui_ImplFreeType_FontSrcData* bd_font_data = (ImGui_ImplFreeType_FontSrcData*)src->FontLoaderData;
     uint32_t glyph_index = FT_Get_Char_Index(bd_font_data->FtFace, codepoint);
@@ -494,9 +494,20 @@ bool ImGui_ImplFreeType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontConfig* src
     if (metrics == nullptr)
         return false;
 
-    // Render glyph into a bitmap (currently held by FreeType)
     FT_Face face = bd_font_data->FtFace;
     FT_GlyphSlot slot = face->glyph;
+    const float rasterizer_density = src->RasterizerDensity * baked->RasterizerDensity;
+
+    // Load metrics only mode
+    const float advance_x = (slot->advance.x / FT_SCALEFACTOR) / rasterizer_density;
+    if (out_advance_x != NULL)
+    {
+        IM_ASSERT(out_glyph == NULL);
+        *out_advance_x = advance_x;
+        return true;
+    }
+
+    // Render glyph into a bitmap (currently held by FreeType)
     FT_Render_Mode render_mode = (bd_font_data->UserFlags & ImGuiFreeTypeLoaderFlags_Monochrome) ? FT_RENDER_MODE_MONO : FT_RENDER_MODE_NORMAL;
     FT_Error error = FT_Render_Glyph(slot, render_mode);
     const FT_Bitmap* ft_bitmap = &slot->bitmap;
@@ -506,11 +517,10 @@ bool ImGui_ImplFreeType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontConfig* src
     const int w = (int)ft_bitmap->width;
     const int h = (int)ft_bitmap->rows;
     const bool is_visible = (w != 0 && h != 0);
-    const float rasterizer_density = src->RasterizerDensity * baked->RasterizerDensity;
 
     // Prepare glyph
     out_glyph->Codepoint = codepoint;
-    out_glyph->AdvanceX = (slot->advance.x / FT_SCALEFACTOR) / rasterizer_density;
+    out_glyph->AdvanceX = advance_x;
 
     // Pack and retrieve position inside texture atlas
     if (is_visible)

misc/freetype/imgui_freetype.h

@@ -8,7 +8,7 @@
 // Usage:
 // - Add '#define IMGUI_ENABLE_FREETYPE' in your imconfig to automatically enable support
 //   for imgui_freetype in imgui. It is equivalent to selecting the default loader with:
-//      io.Fonts.FontLoader = ImGuiFreeType::GetFontLoader()
+//      io.Fonts->SetFontLoader(ImGuiFreeType::GetFontLoader())
 
 // Optional support for OpenType SVG fonts:
 // - Add '#define IMGUI_ENABLE_FREETYPE_PLUTOSVG' to use plutosvg (not provided). See #7927.
@@ -62,7 +62,7 @@ namespace ImGuiFreeType
 {
     // This is automatically assigned when using '#define IMGUI_ENABLE_FREETYPE'.
     // If you need to dynamically select between multiple builders:
-    // - you can manually assign this builder with 'atlas->FontLoader = ImGuiFreeType::GetFontLoader()'
+    // - you can manually assign this builder with 'atlas->SetFontLoader(ImGuiFreeType::GetFontLoader())'
     // - prefer deep-copying this into your own ImFontLoader instance if you use hot-reloading that messes up static data.
     IMGUI_API const ImFontLoader*       GetFontLoader();
 
@@ -75,7 +75,7 @@ namespace ImGuiFreeType
 
     // Obsolete names (will be removed)
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
-    //IMGUI_API const ImFontBuilderIO* GetBuilderForFreeType(); // Renamed/changed in 1.92. Change 'io.Fonts->FontBuilderIO = ImGuiFreeType::GetBuilderForFreeType()' to 'io.Fonts.FontLoader = ImGuiFreeType::GetFontLoader()' if you need runtime selection.
+    //IMGUI_API const ImFontBuilderIO* GetBuilderForFreeType(); // Renamed/changed in 1.92. Change 'io.Fonts->FontBuilderIO = ImGuiFreeType::GetBuilderForFreeType()' to 'io.Fonts->SetFontLoader(ImGuiFreeType::GetFontLoader())' if you need runtime selection.
     //static inline bool BuildFontAtlas(ImFontAtlas* atlas, unsigned int flags = 0) { atlas->FontBuilderIO = GetBuilderForFreeType(); atlas->FontLoaderFlags = flags; return atlas->Build(); } // Prefer using '#define IMGUI_ENABLE_FREETYPE'
 #endif
 }