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Fonts: for large size fonts, layout/size calculation only load glyphs metrics. Actual glyphs are renderer+packed when used by drawing functions. (#8758, #8465)

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(Breaking) breaks signature of ImFontLoader::FontBakedLoadGlyph, sorry.
This commit is contained in:
ocornut 2025-06-30 21:16:20 +02:00
parent 51b3495ad8
commit fd75bdccb0
4 changed files with 93 additions and 23 deletions
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18
misc/freetype/imgui_freetype.cpp
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@ -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)