[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

Mr F <somemail256 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |somemail256 at gmail.com

--- Comment #10 from Mr F <somemail256 at gmail.com> ---
Just stumbled across this nasty bug. Made a little test program: http://geom.io/pc25b/testPNG2.html
1st image: PNG with alpha as an Image element.
2nd image: same PNG without alpha channel as an Image element;
3rd image: canvas, first PNG with alpha, but loaded as WebGL texture and rendered on a quad.

On PC 2nd and 3rd images are the same.
On iOS 3rd image exhibits severe precision loss.

This is quite important to fix for WebGL apps, because we often store different encoded/packed data for textures and do not expect RGB to be broken.

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