[Webkit-unassigned] [Bug 104672] [GTK] Add accelerated 2D canvas support using cairo-gl

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=104672





--- Comment #7 from Martin Robinson <mrobinson at webkit.org>  2012-12-23 09:32:45 PST ---
(In reply to comment #6)

> Anyway, why not call glReadPixels and glTexSubImage2D directly? That would save many data copies between the gl-surface and the mapped image. And even a glReadPixels which is performed at the start of putByteArray while in theory we don't need to read previous pixel data when we just upload new data).

Cairo's map-to-image and unmap-image effectively just do a glReadPixels and glTexSubImage2D. In the future the may be optimized further with PBOs as well. There shouldn't be any extra data copies, as far as I know.

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