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You should read the "MMX enhanced alpha blending"-Article if you want to write your own Alpha Blitter. It is very good.

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I am writing a simple game, and I am planning on using 32 bit color for it. I noticed that DirectDraw color keys can only hold 8 bit color values, so I was wondering, is there any way to use color keys with 16 or 32 bit color? If not, then how do you do transparency with 32 bit color?


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