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Use premultiplied alpha for plDynamicTextMaps on GUI controls.

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This fixes the irregular dark fringes around light text when not exactly pixel-aligned that are caused by independent interpolation of color and alpha. It also makes calculations simpler for things to come.
This commit is contained in:
Christian Walther
2011-12-30 15:10:47 +01:00
committed by Anne Marije v/d Meer
parent b34577103e
commit 8c5286400a
10 changed files with 144 additions and 21 deletions
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9
Sources/Plasma/CoreLib/hsColorRGBA.h
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@ -103,6 +103,7 @@ struct hsColorRGBA {
hsColorRGBA& FromARGB32(uint32_t c);
uint32_t ToARGB32() const;
uint32_t ToARGB32Premultiplied() const;
void Read(hsStream *stream);
void Write(hsStream *stream) const;
@ -141,6 +142,14 @@ inline uint32_t hsColorRGBA::ToARGB32() const
| (uint32_t(b * 255.99f) << 0);
}
inline uint32_t hsColorRGBA::ToARGB32Premultiplied() const
{
return (uint32_t(a * 255.0f + 0.5f) << 24)
| (uint32_t(a * r * 255.0f + 0.5f) << 16)
| (uint32_t(a * g * 255.0f + 0.5f) << 8)
| (uint32_t(a * b * 255.0f + 0.5f) << 0);
}
inline hsColorRGBA operator+(const hsColorRGBA& s, const hsColorRGBA& t)
{
hsColorRGBA res;