Fonts: added ExtraSizeScale feature (undocumented).

imgui.cpp

@@ -17236,6 +17236,9 @@ void ImGui::DebugNodeFont(ImFont* font)
         {
             const ImFontLoader* loader = src->FontLoader ? src->FontLoader : atlas->FontLoader;
             Text("Loader: '%s'", loader->Name ? loader->Name : "N/A");
+
+            //if (DragFloat("ExtraSizeScale", &src->ExtraSizeScale, 0.01f, 0.10f, 2.0f))
+            //    ImFontAtlasFontRebuildOutput(atlas, font);
 #ifdef IMGUI_ENABLE_FREETYPE
             if (loader->Name != NULL && strcmp(loader->Name, "FreeType") == 0)
             {

imgui.h

@@ -3532,7 +3532,7 @@ struct ImFontConfig
     ImS8            OversampleH;            // 0 (2)    // Rasterize at higher quality for sub-pixel positioning. 0 == auto == 1 or 2 depending on size. Note the difference between 2 and 3 is minimal. You can reduce this to 1 for large glyphs save memory. Read https://github.com/nothings/stb/blob/master/tests/oversample/README.md for details.
     ImS8            OversampleV;            // 0 (1)    // Rasterize at higher quality for sub-pixel positioning. 0 == auto == 1. This is not really useful as we don't use sub-pixel positions on the Y axis.
     ImWchar         EllipsisChar;           // 0        // Explicitly specify Unicode codepoint of ellipsis character. When fonts are being merged first specified ellipsis will be used.
-    float           SizePixels;             //          // Size in pixels for rasterizer (more or less maps to the resulting font height).
+    float           SizePixels;             //          // Output size in pixels for rasterizer (more or less maps to the resulting font height).
     const ImWchar*  GlyphRanges;            // NULL     // *LEGACY* THE ARRAY DATA NEEDS TO PERSIST AS LONG AS THE FONT IS ALIVE. Pointer to a user-provided list of Unicode range (2 value per range, values are inclusive, zero-terminated list).
     const ImWchar*  GlyphExcludeRanges;     // NULL     // Pointer to a small user-provided list of Unicode ranges (2 value per range, values are inclusive, zero-terminated list). This is very close to GlyphRanges[] but designed to exclude ranges from a font source, when merging fonts with overlapping glyphs. Use "Input Glyphs Overlap Detection Tool" to find about your overlapping ranges.
     //ImVec2        GlyphExtraSpacing;      // 0, 0     // (REMOVED AT IT SEEMS LARGELY OBSOLETE. PLEASE REPORT IF YOU WERE USING THIS). Extra spacing (in pixels) between glyphs when rendered: essentially add to glyph->AdvanceX. Only X axis is supported for now.
@@ -3542,9 +3542,10 @@ struct ImFontConfig
     float           GlyphExtraAdvanceX;     // 0        // Extra spacing (in pixels) between glyphs. Please contact us if you are using this. // FIXME-NEWATLAS: Intentionally unscaled
     ImU32           FontNo;                 // 0        // Index of font within TTF/OTF file
     unsigned int    FontLoaderFlags;        // 0        // Settings for custom font builder. THIS IS BUILDER IMPLEMENTATION DEPENDENT. Leave as zero if unsure.
-    //unsigned int  FontBuilderFlags;       // --       // [Renamed in 1.92] Ue FontLoaderFlags.
+    //unsigned int  FontBuilderFlags;       // --       // [Renamed in 1.92] Use FontLoaderFlags.
     float           RasterizerMultiply;     // 1.0f     // Linearly brighten (>1.0f) or darken (<1.0f) font output. Brightening small fonts may be a good workaround to make them more readable. This is a silly thing we may remove in the future.
     float           RasterizerDensity;      // 1.0f     // [LEGACY: this only makes sense when ImGuiBackendFlags_RendererHasTextures is not supported] DPI scale multiplier for rasterization. Not altering other font metrics: makes it easy to swap between e.g. a 100% and a 400% fonts for a zooming display, or handle Retina screen. IMPORTANT: If you change this it is expected that you increase/decrease font scale roughly to the inverse of this, otherwise quality may look lowered.
+    float           ExtraSizeScale;         // 1.0f     // Extra rasterizer scale over SizePixels.
 
     // [Internal]
     ImFontFlags     Flags;                  // Font flags (don't use just yet, will be exposed in upcoming 1.92.X updates)

imgui_draw.cpp

@@ -2418,6 +2418,7 @@ ImFontConfig::ImFontConfig()
     FontDataOwnedByAtlas = true;
     OversampleH = 0; // Auto == 1 or 2 depending on size
     OversampleV = 0; // Auto == 1
+    ExtraSizeScale = 1.0f;
     GlyphMaxAdvanceX = FLT_MAX;
     RasterizerMultiply = 1.0f;
     RasterizerDensity = 1.0f;
@@ -4612,6 +4613,7 @@ static bool ImGui_ImplStbTrueType_FontSrcInit(ImFontAtlas* atlas, ImFontConfig*
     bd_font_data->ScaleFactor = stbtt_ScaleForPixelHeight(&bd_font_data->FontInfo, 1.0f);
     if (src->MergeMode && src->SizePixels != 0.0f && ref_size != 0.0f)
         bd_font_data->ScaleFactor *= src->SizePixels / ref_size; // FIXME-NEWATLAS: Should tidy up that a bit
+    bd_font_data->ScaleFactor *= src->ExtraSizeScale;
 
     return true;
 }

misc/freetype/imgui_freetype.cpp

@@ -420,6 +420,7 @@ static bool ImGui_ImplFreeType_FontBakedInit(ImFontAtlas* atlas, ImFontConfig* s
     float size = baked->Size;
     if (src->MergeMode && src->SizePixels != 0.0f)
         size *= (src->SizePixels / baked->OwnerFont->Sources[0]->SizePixels);
+    size *= src->ExtraSizeScale;
 
     ImGui_ImplFreeType_FontSrcData* bd_font_data = (ImGui_ImplFreeType_FontSrcData*)src->FontLoaderData;
     bd_font_data->BakedLastActivated = baked;