[Pixman] [PATCH] sse2: Skip src pixels that are zero in sse2_composite_over_8888_n_8888()

Rodrigo Kumpera kumpera at gmail.com
Sat Dec 25 05:04:47 PST 2010

On Wed, Dec 22, 2010 at 12:11 PM, Soeren Sandmann <sandmann at daimi.au.dk>wrote:

> Rodrigo Kumpera <kumpera at gmail.com> writes:
> > This patch doesn't handle cases where alpha is zero but components are
> not.
> > Not sure
> > if this is either possible or frequent.
> It's certainly supposed to handle this case, though it's probably not
> frequent. I don't see the bug, though - if any part of the source is
> non-zero, then it goes through the full compositing step. Or am I
> missing something?
No, definitely not. I thought that over with zero alpha was a nop too, but
it's not the case.
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