[Webkit-unassigned] [Bug 58567] invert is treated like currentColor

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=58567





--- Comment #3 from David Barr <davidbarr at chromium.org>  2011-05-17 20:00:35 PST ---
The graphics abstraction that WebCore uses to wrap CoreGraphics/Skia/Qt presently hides the necessary composite operation for color inversion. CoreGraphics has CGBlendMode::kCGBlendModeDifference, Skia has SkXfermode::Mode:: kDifference_Mode and Qt has QPainter::CompositionMode_Difference but there is not a corresponding value in WebCore::CompositeOperator as yet.

TL;DR: The primitives necessary for this feature are not yet exposed by the graphics layer in WebCore.

With the view that this abstraction forms part of the platform, the fallback behavior is compliant.

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