Review URL: http://codereview.appspot.com/156057/show.
git-svn-id: http://skia.googlecode.com/svn/trunk@438
2bbb7eff-a529-9590-31e7-
b0007b416f81
*/
static inline unsigned SkAlpha255To256(U8CPU alpha) {
SkASSERT(SkToU8(alpha) == alpha);
-#ifndef SK_USE_OLD_255_TO_256
// this one assues that blending on top of an opaque dst keeps it that way
// even though it is less accurate than a+(a>>7) for non-opaque dsts
return alpha + 1;
-#else
- return alpha + (alpha >> 7);
-#endif
}
/** Multiplify value by 0..256, and shift the result down 8