[Webkit-unassigned] [Bug 51498] Avoid decoding images twice in texImage2D

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=51498





--- Comment #7 from John Bauman <jbauman at chromium.org>  2011-04-01 09:04:17 PST ---
It looks like making BitmapImage::frameHasAlphaAtIndex public will work, so I'll just add CG support to this patch.

Times for doing texImage2D from 1000 images go from 5200 ms (jpeg to premultiplied), 4200 ms (jpeg to non-premultiplied), 9300 ms (png to premultiplied) and 8400 ms (png to nonpremultiplied) down to 1900ms, 2400ms, 4000ms, 8400 ms, respectively. On skia we even get a performance gain for pngs that have alpha channels but no transparent pixels, but unfortunately we can't get that gain on CG.

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