[Webkit-unassigned] [Bug 137793] Calling glReadPixels with BGRA format on an NVIDIA machine with an opaque context returns the wrong alpha values.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=137793

--- Comment #7 from Dean Jackson <dino at apple.com> ---
Comment on attachment 240001
  --> https://bugs.webkit.org/attachment.cgi?id=240001
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=240001&action=review

> Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGL.cpp:73
> +        int totalBytes = width * height * 4;
> +        for (int i = 0; i < totalBytes; i += 4)
> +            std::swap(pixels[i], pixels[i + 2]);

I wonder if something like vImagePermuteChannels_ARGB8888 would do this faster.

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