Created
October 14, 2014 20:33
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Fast integer alpha blending
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| uint32 blend(uint32 color1, uint32 color2, uint8 alpha) { | |
| uint32 rb = color1 & 0xff00ff; | |
| uint32 g = color1 & 0x00ff00; | |
| rb += ((color2 & 0xff00ff) - rb) * alpha >> 8; | |
| g += ((color2 & 0x00ff00) - g) * alpha >> 8; | |
| return (rb & 0xff00ff) | (g & 0xff00); | |
| } |
Since you are dividing 256 not 255 so in your case return (rb & 0xff00ff) | (g & 0xff00); cant change to return rb | g;
Anyway, I like this code.
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yep, check optimized version https://gist.github.com/XProger/155262f898ceb2368323