[Webkit-unassigned] [Bug 138477] Don't premultiply and then unpremultiply PNGs on iOS.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=138477

--- Comment #9 from Roger Fong <roger_fong at apple.com> ---
I will run a test where I draw an image with an alpha gradient.
Because this only really effects low alpha values, i'll then re-render the image after removing the alpha channels. I'd expect to see a lot of banding.

I'll also write a performance test to continually redraw a (large) png (on a retina device?) and then run do some before and after profiling.

After I prove that this actually is an improvement (even if only slight) and if I determine that its not a noticeable performance hit then I think we'd be good to go.

If not, I can special case to only pngs used by WebGL (A call to texture2d).

It would be also nice if CG just had a flag for the decoder to return the raw png data instead of having to jump through all these hoops to get to it.

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