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imgui_freetype: fixed overwriting ImFontConfig::PixelSnapH when hinting is enabled.

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Fix/amend 99f6b305c1.
This commit is contained in:
ocornut 2025-12-22 17:51:24 +01:00
parent d87650dffb
commit 9055c9ed22
3 changed files with 8 additions and 7 deletions
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4
docs/CHANGELOG.txt
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@ -67,6 +67,10 @@ Other Changes:
- Fonts:
- Fixed an issue related to EllipsisChar handling, while changing
font loader or font loader flags dynamically in Style->Fonts menus.
- imgui_freetype: fixed overwriting ImFontConfig::PixelSnapH when hinting
is enabled, creating side-effects when later disabling hinting or
dynamically switching to stb_truetype rasterizer.
which would prevent
- Textures:
- Fixed a building issue when ImTextureID is defined as a struct.
- Fixed displaying texture # in Metrics/Debugger window.

1
imgui_draw.cpp
View file

@ -3392,6 +3392,7 @@ void ImFontAtlasBuildMain(ImFontAtlas* atlas)
void ImFontAtlasBuildGetOversampleFactors(ImFontConfig* src, ImFontBaked* baked, int* out_oversample_h, int* out_oversample_v)
{
// (Only used by stb_truetype builder)
// Automatically disable horizontal oversampling over size 36
const float raster_size = baked->Size * baked->RasterizerDensity * src->RasterizerDensity;
*out_oversample_h = (src->OversampleH != 0) ? src->OversampleH : (raster_size > 36.0f || src->PixelSnapH) ? 1 : 2;

10
misc/freetype/imgui_freetype.cpp
View file

@ -153,7 +153,7 @@ struct ImGui_ImplFreeType_Data
struct ImGui_ImplFreeType_FontSrcData
{
// Initialize from an external data buffer. Doesn't copy data, and you must ensure it stays valid up to this object lifetime.
bool InitFont(FT_Library ft_library, ImFontConfig* src, ImGuiFreeTypeLoaderFlags extra_user_flags);
bool InitFont(FT_Library ft_library, const ImFontConfig* src, ImGuiFreeTypeLoaderFlags extra_user_flags);
void CloseFont();
ImGui_ImplFreeType_FontSrcData() { memset((void*)this, 0, sizeof(*this)); }
~ImGui_ImplFreeType_FontSrcData() { CloseFont(); }
@ -172,7 +172,7 @@ struct ImGui_ImplFreeType_FontSrcBakedData
ImGui_ImplFreeType_FontSrcBakedData() { memset((void*)this, 0, sizeof(*this)); }
};
bool ImGui_ImplFreeType_FontSrcData::InitFont(FT_Library ft_library, ImFontConfig* src, ImGuiFreeTypeLoaderFlags extra_font_loader_flags)
bool ImGui_ImplFreeType_FontSrcData::InitFont(FT_Library ft_library, const ImFontConfig* src, ImGuiFreeTypeLoaderFlags extra_font_loader_flags)
{
FT_Error error = FT_New_Memory_Face(ft_library, (const FT_Byte*)src->FontData, (FT_Long)src->FontDataSize, (FT_Long)src->FontNo, &FtFace);
if (error != 0)
@ -187,12 +187,8 @@ bool ImGui_ImplFreeType_FontSrcData::InitFont(FT_Library ft_library, ImFontConfi
LoadFlags = 0;
if ((UserFlags & ImGuiFreeTypeLoaderFlags_Bitmap) == 0)
LoadFlags |= FT_LOAD_NO_BITMAP;
if (UserFlags & ImGuiFreeTypeLoaderFlags_NoHinting)
LoadFlags |= FT_LOAD_NO_HINTING;
else
src->PixelSnapH = true; // FIXME: A bit weird to do this this way.
if (UserFlags & ImGuiFreeTypeLoaderFlags_NoAutoHint)
LoadFlags |= FT_LOAD_NO_AUTOHINT;
if (UserFlags & ImGuiFreeTypeLoaderFlags_ForceAutoHint)
@ -543,7 +539,7 @@ static bool ImGui_ImplFreeType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontConf
const float offsets_scale = (ref_size != 0.0f) ? (baked->Size / ref_size) : 1.0f;
float font_off_x = (src->GlyphOffset.x * offsets_scale);
float font_off_y = (src->GlyphOffset.y * offsets_scale) + baked->Ascent;
if (src->PixelSnapH) // Snap scaled offset. This is to mitigate backward compatibility issues for GlyphOffset, but a better design would be welcome.
if (src->PixelSnapH || (bd_font_data->UserFlags & ImGuiFreeTypeLoaderFlags_NoHinting) == 0) // Snap scaled offset. This is to mitigate backward compatibility issues for GlyphOffset, but a better design would be welcome.
font_off_x = IM_ROUND(font_off_x);
if (src->PixelSnapV)
font_off_y = IM_ROUND(font_off_y);