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imgui_freetype: comments about correct blending and sRGB (#618, #578)

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omar
2018-02-05 11:21:06 +01:00
parent a33b86dac7
commit cf6b39600b
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6
misc/freetype/README.md
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@ -17,6 +17,12 @@ ImGuiFreeType::BuildFontAtlas(io.Fonts, flags);
io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
```
**Gamma Correct Blending**
FreeType assumes blending in linear space rather than gamma space.
See FreeType note for [FT_Render_Glyph](https://www.freetype.org/freetype2/docs/reference/ft2-base_interface.html#FT_Render_Glyph).
For correct results you need to be using sRGB and convert to linear space in the pixel shader output.
The default imgui styles will be impacted by this change (alpha values will need tweaking).
**Test code Usage**
```cpp
#include "misc/freetype/imgui_freetype.h"