Fonts: AddFont() functions now allow size_pixels==0.0f (only required when using certain functions)

Fonts: AddFont() funcitons allow size_pixels==0 for merged fonts.

imgui.h

@@ -3577,10 +3577,10 @@ struct ImFontAtlas
     IMGUI_API ~ImFontAtlas();
     IMGUI_API ImFont*           AddFont(const ImFontConfig* font_cfg);
     IMGUI_API ImFont*           AddFontDefault(const ImFontConfig* font_cfg = NULL);
-    IMGUI_API ImFont*           AddFontFromFileTTF(const char* filename, float size_pixels, const ImFontConfig* font_cfg = NULL, const ImWchar* glyph_ranges = NULL);
-    IMGUI_API ImFont*           AddFontFromMemoryTTF(void* font_data, int font_data_size, float size_pixels, const ImFontConfig* font_cfg = NULL, const ImWchar* glyph_ranges = NULL); // Note: Transfer ownership of 'ttf_data' to ImFontAtlas! Will be deleted after destruction of the atlas. Set font_cfg->FontDataOwnedByAtlas=false to keep ownership of your data and it won't be freed.
-    IMGUI_API ImFont*           AddFontFromMemoryCompressedTTF(const void* compressed_font_data, int compressed_font_data_size, float size_pixels, const ImFontConfig* font_cfg = NULL, const ImWchar* glyph_ranges = NULL); // 'compressed_font_data' still owned by caller. Compress with binary_to_compressed_c.cpp.
-    IMGUI_API ImFont*           AddFontFromMemoryCompressedBase85TTF(const char* compressed_font_data_base85, float size_pixels, const ImFontConfig* font_cfg = NULL, const ImWchar* glyph_ranges = NULL);              // 'compressed_font_data_base85' still owned by caller. Compress with binary_to_compressed_c.cpp with -base85 parameter.
+    IMGUI_API ImFont*           AddFontFromFileTTF(const char* filename, float size_pixels = 0.0f, const ImFontConfig* font_cfg = NULL, const ImWchar* glyph_ranges = NULL);
+    IMGUI_API ImFont*           AddFontFromMemoryTTF(void* font_data, int font_data_size, float size_pixels = 0.0f, const ImFontConfig* font_cfg = NULL, const ImWchar* glyph_ranges = NULL); // Note: Transfer ownership of 'ttf_data' to ImFontAtlas! Will be deleted after destruction of the atlas. Set font_cfg->FontDataOwnedByAtlas=false to keep ownership of your data and it won't be freed.
+    IMGUI_API ImFont*           AddFontFromMemoryCompressedTTF(const void* compressed_font_data, int compressed_font_data_size, float size_pixels = 0.0f, const ImFontConfig* font_cfg = NULL, const ImWchar* glyph_ranges = NULL); // 'compressed_font_data' still owned by caller. Compress with binary_to_compressed_c.cpp.
+    IMGUI_API ImFont*           AddFontFromMemoryCompressedBase85TTF(const char* compressed_font_data_base85, float size_pixels = 0.0f, const ImFontConfig* font_cfg = NULL, const ImWchar* glyph_ranges = NULL);              // 'compressed_font_data_base85' still owned by caller. Compress with binary_to_compressed_c.cpp with -base85 parameter.
     IMGUI_API void              RemoveFont(ImFont* font);
 
     IMGUI_API void              Clear();                    // Clear everything (input fonts, output glyphs/textures)

imgui_draw.cpp

@@ -4533,11 +4533,14 @@ static bool ImGui_ImplStbTrueType_FontSrcInit(ImFontAtlas* atlas, ImFontConfig*
     }
     src->FontLoaderData = bd_font_data;
 
+    if (src->MergeMode && src->SizePixels == 0.0f)
+        src->SizePixels = src->DstFont->Sources[0]->SizePixels;
+
     if (src->SizePixels >= 0.0f)
         bd_font_data->ScaleFactor = stbtt_ScaleForPixelHeight(&bd_font_data->FontInfo, 1.0f);
     else
         bd_font_data->ScaleFactor = stbtt_ScaleForMappingEmToPixels(&bd_font_data->FontInfo, 1.0f);
-    if (src != src->DstFont->Sources[0])
+    if (src->MergeMode && src->SizePixels != 0.0f)
         bd_font_data->ScaleFactor *= src->SizePixels / src->DstFont->Sources[0]->SizePixels; // FIXME-NEWATLAS: Should tidy up that a bit
 
     return true;

misc/freetype/imgui_freetype.cpp

@@ -421,7 +421,9 @@ void ImGui_ImplFreeType_FontSrcDestroy(ImFontAtlas* atlas, ImFontConfig* src)
 bool ImGui_ImplFreeType_FontBakedInit(ImFontAtlas* atlas, ImFontConfig* src, ImFontBaked* baked, void* loader_data_for_baked_src)
 {
     IM_UNUSED(atlas);
-    const float size = baked->Size * (src->SizePixels / baked->ContainerFont->Sources[0]->SizePixels); // FIXME-NEWATLAS: Should tidy up that a bit
+    float size = baked->Size;
+    if (src->MergeMode && src->SizePixels != 0.0f)
+        size *= (src->SizePixels / baked->ContainerFont->Sources[0]->SizePixels);
 
     ImGui_ImplFreeType_FontSrcData* bd_font_data = (ImGui_ImplFreeType_FontSrcData*)src->FontLoaderData;
     bd_font_data->BakedLastActivated = baked;
@@ -637,7 +639,7 @@ static FT_Error ImGuiLunasvgPortRender(FT_GlyphSlot slot, FT_Pointer* _state)
 #else
     state->svg->setMatrix(state->svg->matrix().identity()); // Reset the svg matrix to the default value
     state->svg->render(bitmap, state->matrix);              // state->matrix is already scaled and translated
-#endif 
+#endif
     state->err = FT_Err_Ok;
     return state->err;
 }