[ENH] Faster alpha blending

Duane Maxwell dmaxwell at exobox.com
Wed Nov 22 21:54:05 UTC 2000


Change Set:		AlphaBlendOpt
Date:			22 November 2000
Author:			Duane Maxwell, Paul Phillips/exobox

Short circuits full opaque and full transparent pixels when alpha blending.

Requires rebuild of VM to take effect, since this code is in the Slang for
BitBlt.

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