[Webkit-unassigned] [Bug 237082] createImageBitmap cannot premultiply alpha with ImageData

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=237082

--- Comment #4 from Brent Fulgham <bfulgham at webkit.org> ---
The RGBA8 is then permuted to BGRA to go into the IOSurface:

00 00 2C 2C

Becomes

2C 00 00 2C

So the image buffer is properly constructed.

I think the issue is when this buffer is used to populate the textImage (WebGLRenderingContextBase::texImageSource) doesn't have the context that the image data is premultiplied; it looks like it rolls the premultiplication out of the buffer before loading into the texture.

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