[Webkit-unassigned] [Bug 40884] [Qt] When we render WebGL offscreen, color conversion cost a lot of CPU cycles

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=40884





--- Comment #5 from Jarkko Sakkinen <jarkko.j.sakkinen at gmail.com>  2011-03-17 03:51:41 PST ---
I don't have an use case for this. Just thinking that it gives more compatibility even if performance is not optimal. I think it would make the overall behaviour also more stable to a developer that uses QtWebKit. Documentation should document settings for optimal performance.

See for example this bug that I'm fixing:
https://bugs.webkit.org/show_bug.cgi?id=56555

Kind of rare use case in real-world, though.

Now, for example, fallback is needed for this use case:
http://developer.qt.nokia.com/forums/viewthread/4505/

Only when QGLWidget is used as the viewport GraphicsContext3D content can be texture mapped.

Should I make a patch for GraphicsContext3D that creation fails if accelerated compositing is not enabled from the settings or QGLWidget viewport does not exist? I can fix the bug 56555 by invalidating GraphicsContext3D if viewport changes after creation if this is the case.

I think this is anyway your (QtWebKit team) call and I don't really have too strong opinions on this :)

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