[Webkit-unassigned] [Bug 50714] [Skia] Improve PNG compression by stripping the alpha channel when it's fully opaque

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=50714





--- Comment #2 from Cosmin Truta <ctruta at chromium.org>  2010-12-08 21:54:28 PST ---
(In reply to comment #1)
> There are no new layout tests, as I did not find a test that exports PNG images, and I did not know how to write one. I will greatly appreciate any help.

Well, I did find a test: fast/canvas/toDataURL-alpha.html. But I can't really test it using ImageDiff (I can only have confirmation that I haven't broken anything), because ImageDiff expands the types of compared images up to RGBA.

There are tools that display the IHDR information (e.g. pngcheck). But I still don't know how to put something like that in layout testing.

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