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 Profiling with the firefox profiler gave me this: http://people.mozilla.org/~bgirard/cleopatra/#report=16311253e5a8e996ac4e7734985e55f44197a203 and that seems to point pretty much to bits_image_fetch_bilinear_affine() being the bottle-neck. Now I realise this has been kind-of asked about previously, back in feb 2011, in the context of speeding up scaling in cairo: http://www.mail-archive.com/[email protected]/msg00921.html and in that response Siarhei pointed out about his attached patch, that it doesn't make much sense to only improve bilinear_interpolation as it would only make things approx 2x faster than C but in my current situation I would be very glad to even have that 2x improvement in performance, at least to start with. Unfortunately I havn't been able to get Siarhei's patch to compile in the pixman shipped in firefox (from current moz-central hg repo), with gcc complaining about it not liking thumb mode instructions: http://pastebin.mozilla.org/3023188 to test out if it really would speed up my test case. I also realise that the scaling issue was addressed by a set of patches that Siarhei submitted and that then went into pixman and then on into firefox but I wanted to ask is something simliar is possible to now also speed up bits_image_fetch_bilinear_affine with Neon for arm too? And sorry in advance if I have got any of the pieces of this mixed up, I'm pretty new to all this. thanks, Maks. _______________________________________________ Pixman mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/pixman
