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imgui_freetype: fixed issue where glyph advances would incorrectly be snapped to pixels.

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ocornut 2025-01-16 17:42:00 +01:00
parent 007735737a
commit 4c64ba16c5
2 changed files with 8 additions and 4 deletions
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4
docs/CHANGELOG.txt
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@ -47,6 +47,10 @@ Breaking changes:
Other changes: Other changes:
- ImDrawList: texture baked storage for thick line reduced from ~64x64 to ~32x32. (#3245) - ImDrawList: texture baked storage for thick line reduced from ~64x64 to ~32x32. (#3245)
- imgui_freetype: fixed issue where glyph advances would incorrectly be
snapped to pixels. Effectively it would only be noticeable when hinting
is disabled with ImGuiFreeTypeBuilderFlags_NoHinting, as hinting itself
snaps glyph advances.
- Examples: DirectX12: Reduced number of frame in flight from 3 to 2 in - Examples: DirectX12: Reduced number of frame in flight from 3 to 2 in
provided example, to reduce latency. provided example, to reduce latency.
- Examples: Vulkan: better handle VK_SUBOPTIMAL_KHR being returned by - Examples: Vulkan: better handle VK_SUBOPTIMAL_KHR being returned by

8
misc/freetype/imgui_freetype.cpp
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@ -104,6 +104,9 @@ static FT_Error ImGuiLunasvgPortPresetSlot(FT_GlyphSlot slot, FT_Bool cache, FT_
// Code // Code
//------------------------------------------------------------------------- //-------------------------------------------------------------------------
#define FT_CEIL(X) (((X + 63) & -64) / 64) // From SDL_ttf: Handy routines for converting from fixed point
#define FT_SCALEFACTOR 64.0f
namespace namespace
{ {
// Glyph metrics: // Glyph metrics:
@ -182,9 +185,6 @@ namespace
float InvRasterizationDensity; float InvRasterizationDensity;
}; };
// From SDL_ttf: Handy routines for converting from fixed point
#define FT_CEIL(X) (((X + 63) & -64) / 64)
bool FreeTypeFont::InitFont(FT_Library ft_library, const ImFontConfig& cfg, unsigned int extra_font_builder_flags) bool FreeTypeFont::InitFont(FT_Library ft_library, const ImFontConfig& cfg, unsigned int extra_font_builder_flags)
{ {
FT_Error error = FT_New_Memory_Face(ft_library, (uint8_t*)cfg.FontData, (uint32_t)cfg.FontDataSize, (uint32_t)cfg.FontNo, &Face); FT_Error error = FT_New_Memory_Face(ft_library, (uint8_t*)cfg.FontData, (uint32_t)cfg.FontDataSize, (uint32_t)cfg.FontNo, &Face);
@ -316,7 +316,7 @@ namespace
out_glyph_info->Height = (int)ft_bitmap->rows; out_glyph_info->Height = (int)ft_bitmap->rows;
out_glyph_info->OffsetX = Face->glyph->bitmap_left; out_glyph_info->OffsetX = Face->glyph->bitmap_left;
out_glyph_info->OffsetY = -Face->glyph->bitmap_top; out_glyph_info->OffsetY = -Face->glyph->bitmap_top;
out_glyph_info->AdvanceX = (float)FT_CEIL(slot->advance.x); out_glyph_info->AdvanceX = (float)slot->advance.x / FT_SCALEFACTOR;
out_glyph_info->IsColored = (ft_bitmap->pixel_mode == FT_PIXEL_MODE_BGRA); out_glyph_info->IsColored = (ft_bitmap->pixel_mode == FT_PIXEL_MODE_BGRA);
return ft_bitmap; return ft_bitmap;