We fail to trigger a fast path in Skia if we draw from RGB565 to RGB565 with kSrc_Mode set for the xfermode. If we use kSrcOver_Mode it does trigger the fast path, and these two xfermodes are identical on RGB565 as it's opaque.
Filed bug upstream at http://code.google.com/p/skia/issues/detail?id=628
Created attachment 629831 [details] [diff] [review]
Trigger Skia's RGB565 blitter fast path by using SrcOver instead of Src.