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[SDL] Blit effects

Subject: [SDL] Blit effects
From: Mason Wheeler
Date: Mon, 17 Mar 2008 12:47:17 -0700 PDT
When blitting an image, how do you do special effects?  For example, it's easy 
to do a direct copy, an alpha-blended copy or a color-keyed copy, but what if I 
wanted to use effects such as Add, Multiply, Maximum, etc?  How do I set those 
up?


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