Added general RGB surface format fallbacks to drawing code
Fixed issues with destination surface alpha channel
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extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403360
From: Couriersud
Subject: 32 & 16 bit versions of blendrect and blendline
attached are 32, 16 and 15 bit versions of the blendrect and blendline
functionality. There was an issue with the bresenham alg. in drawline
which I also fixed.
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extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403358