[Webkit-unassigned] [Bug 89248] [cairo] simplify copyCairoImageSurface

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=89248





--- Comment #5 from arno. <arno at renevier.net>  2012-06-25 16:18:37 PST ---
(In reply to comment #3)
> Does this change show a measurable performance improvement?

http://renevier.net/misc/webkit_89248.html
Currently GtkLauncher, display on average on startup:

10px*10px; 100000 iterations: 450ms
100px*100px; 10000 iterations: 260ms
1000px*1000px; 100 iterations: 180ms

after a few page reloads, times are:

10px*10px; 100000 iterations: 350ms
100px*100px; 10000 iterations: 115ms
1000px*1000px; 100 iterations: 110ms

with the patch, times are:

10px*10px; 100000 iterations: 240ms
100px*100px; 10000 iterations: 215ms
1000px*1000px; 100 iterations: 210ms

and after a few page reloads:

10px*10px; 100000 iterations: 160ms
100px*100px; 10000 iterations: 70ms
1000px*1000px; 100 iterations: 45ms

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