[Webkit-unassigned] [Bug 235002] readPixels directly to ArrayBuffer has very high CPU usage

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=235002

Gregg Tavares <gman at chromium.org> changed:

           What    |Removed                     |Added
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                 CC|                            |gman at chromium.org

--- Comment #9 from Gregg Tavares <gman at chromium.org> ---
fyi: In my experiments if you render to your own texture (via a framebuffer) you'll get your speed back. Based on the trace above my guess it's the IOSurfaceLock/Unlock causing the slowdown. That's only needed for reading the canvas itself, not for reading your own texture.

Of course we should optimize reading the canvas too, just pointing out a possible workaround.

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