On Wed, 11 Sep 2013 17:07:52 +1000 Maksim Lin <[email protected]> wrote:
> Hi, > > I'm working on finding out the cause of poor drawing performance of > Firefox on android: > https://bugzilla.mozilla.org/show_bug.cgi?id=911882 > > The html causing the problem is essentially doing a image translation: > http://manichord.com/opensign/ffdebug/ffscroll.html When this web page is zoomed in Firefox, we get bilinear scaling for x8r8g8b8 -> a8r8g8b8 (SRC operator, PAD repeat). And there is simply no NEON or SSE2 optimized fast path in the currently released versions of pixman (or in the Mozilla's internal pixman copy), which could do this scaling while also setting the alpha channel to 0xFF at the same time. A universal general solution would be to extend the SSSE3 bilinear fetch iterator in pixman git repository to handle all repeat types and also add NEON and SSE2 bilinear fetch iterators. But first it would be a good idea to record a cairo trace for this use case. -- Best regards, Siarhei Siamashka _______________________________________________ Pixman mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/pixman
