38 lines
1.8 KiB
Markdown
38 lines
1.8 KiB
Markdown
# imgui_freetype
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Build font atlases using FreeType instead of stb_truetype (which is the default font rasterizer).
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<br>by @vuhdo, @mikesart, @ocornut.
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### Usage
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1. Get latest FreeType binaries or build yourself (under Windows you may use vcpkg with `vcpkg install freetype --triplet=x64-windows`, `vcpkg integrate install`).
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2. Add imgui_freetype.h/cpp alongside your project files.
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3. Add `#define IMGUI_ENABLE_FREETYPE` in your [imconfig.h](https://github.com/ocornut/imgui/blob/master/imconfig.h) file
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### About Gamma Correct Blending
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FreeType assumes blending in linear space rather than gamma space.
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See FreeType note for [FT_Render_Glyph](https://www.freetype.org/freetype2/docs/reference/ft2-base_interface.html#FT_Render_Glyph).
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For correct results you need to be using sRGB and convert to linear space in the pixel shader output.
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The default Dear ImGui styles will be impacted by this change (alpha values will need tweaking).
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### Testbed for toying with settings (for developers)
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See https://gist.github.com/ocornut/b3a9ecf13502fd818799a452969649ad
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### Known issues
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- Oversampling settins are ignored but also not so much necessary with the higher quality rendering.
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### Comparaison
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Small, thin anti-aliased fonts typically benefit a lot from FreeType's hinting:
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### Colorful glyphs/emojis
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You can use the `ImGuiFreeTypeBuilderFlags_LoadColor` flag to load certain colorful glyphs. See the
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["Using Colorful Glyphs/Emojis"](https://github.com/ocornut/imgui/blob/master/docs/FONTS.md#using-colorful-glyphsemojis) section of FONTS.md.
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