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(svn r13640) -Codechange: make colours behind not fully solid objects less darker for BM_TRANSPARENT (for 32bpp blitters)

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smatz
2008-06-26 16:47:29 +00:00
parent faebe10d81
commit 7ec2ad621d
3 changed files with 34 additions and 17 deletions
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7
src/blitter/32bpp_base.hpp
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@@ -105,16 +105,17 @@ public:
/**
* Make a pixel looks like it is transparent.
* @param colour the colour already on the screen.
* @param amount the amount of transparency, times 256.
* @param nom the amount of transparency, nominator, makes colour lighter.
* @param denom denominator, makes colour darker.
* @return the new colour for the screen.
*/
static inline uint32 MakeTransparent(uint32 colour, uint amount)
static inline uint32 MakeTransparent(uint32 colour, uint nom, uint denom = 256)
{
uint r = GB(colour, 16, 8);
uint g = GB(colour, 8, 8);
uint b = GB(colour, 0, 8);
return ComposeColour(0xFF, r * amount / 256, g * amount / 256, b * amount / 256);
return ComposeColour(0xFF, r * nom / denom, g * nom / denom, b * nom / denom);
}
/**