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Fonts: stop using stb_truetype.h implementation functions. Fix using IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION. (#8794)

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ocornut
2025-07-23 16:42:00 +09:00
parent b884533957
commit 19d1ad04f4
2 changed files with 7 additions and 20 deletions
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3
docs/CHANGELOG.txt
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@@ -49,8 +49,7 @@ Other Changes:
- Error Handling: minor improvements to error handling for TableGetSortSpecs()
and TableSetBgColor() calls. (#1651, #8499)
- Misc: fixed building with IMGUI_DISABLE_DEBUG_TOOLS only. (#8796)
- Misc: document/workaround an issue using IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION
since 1.92.0. (#8794) [@tim-rex]
- Misc: fixed building with IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION. (#8794)
- Misc: removed more redundant inline static linkage from imgui_internal.h to
facilitate using in C++ modules. (#8813, #8682, #8358) [@stripe2933]
- CI: Added SDL3 builds to MacOS and Windows. (#8819, #8778) [@scribam]

24
imgui_draw.cpp
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@@ -4622,15 +4622,6 @@ static bool ImGui_ImplStbTrueType_FontBakedInit(ImFontAtlas* atlas, ImFontConfig
return true;
}
// Since 1.92.0 (June 2025) we rely on those 3 functions which are implemented inside stb_truetype.h and require STB_TRUETYPE_IMPLEMENTATION.
// Using IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION became broken, see https://github.com/ocornut/imgui/issues/8794
// One way to fix is to remove the 'static' keywords for those 3 functions in your copy of stb_truetype.h
#ifdef IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION
extern void stbtt__h_prefilter(unsigned char* pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width);
extern void stbtt__v_prefilter(unsigned char* pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width);
extern float stbtt__oversample_shift(int oversample);
#endif
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
@@ -4688,15 +4679,12 @@ static bool ImGui_ImplStbTrueType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontC
builder->TempBuffer.resize(w * h * 1);
unsigned char* bitmap_pixels = builder->TempBuffer.Data;
memset(bitmap_pixels, 0, w * h * 1);
stbtt_MakeGlyphBitmapSubpixel(&bd_font_data->FontInfo, bitmap_pixels, r->w - oversample_h + 1, r->h - oversample_v + 1, w,
scale_for_raster_x, scale_for_raster_y, 0, 0, glyph_index);
// Oversampling
// Render with oversampling
// (those functions conveniently assert if pixels are not cleared, which is another safety layer)
if (oversample_h > 1)
stbtt__h_prefilter(bitmap_pixels, r->w, r->h, r->w, oversample_h);
if (oversample_v > 1)
stbtt__v_prefilter(bitmap_pixels, r->w, r->h, r->w, oversample_v);
float sub_x, sub_y;
stbtt_MakeGlyphBitmapSubpixelPrefilter(&bd_font_data->FontInfo, bitmap_pixels, w, h, w,
scale_for_raster_x, scale_for_raster_y, 0, 0, oversample_h, oversample_v, &sub_x, &sub_y, glyph_index);
const float ref_size = baked->ContainerFont->Sources[0]->SizePixels;
const float offsets_scale = (ref_size != 0.0f) ? (baked->Size / ref_size) : 1.0f;
@@ -4706,8 +4694,8 @@ static bool ImGui_ImplStbTrueType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontC
font_off_x = IM_ROUND(font_off_x);
if (src->PixelSnapV)
font_off_y = IM_ROUND(font_off_y);
font_off_x += stbtt__oversample_shift(oversample_h);
font_off_y += stbtt__oversample_shift(oversample_v) + IM_ROUND(baked->Ascent);
font_off_x += sub_x;
font_off_y += sub_y + IM_ROUND(baked->Ascent);
float recip_h = 1.0f / (oversample_h * rasterizer_density);
float recip_v = 1.0f / (oversample_v * rasterizer_density);