[Webkit-unassigned] [Bug 129305] [CSS Blending] Incomplete repainting when setting blend mode on an element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=129305





--- Comment #6 from Dirk Schulze <krit at webkit.org>  2014-02-27 10:45:28 PST ---
(In reply to comment #5)
> Created an attachment (id=225362)
 --> (https://bugs.webkit.org/attachment.cgi?id=225362&action=review) [details]
> Screenshot of expected versus current behaviour
> 
> This screenshot shows the current behaviour (upper part) versus the actual behaviour (lower part of the image).
> 
> This test has two divs: the yellow top one creates a stacking context, while the second blue div is placed on top of the first one.
> When setting -webkit-mix-blend-mode on the blue div from script, it should only blend with the contents of the yellow div, since it's the parent stacking context.
> This means that the part of the blue div that doesn't overlap the parent shouldn't blend with the body - it should stay blue.
> 
> The problem I've found was that the lower fragment of the yellow div wouldn't get repainted when setting blend-mode dynamically.
> Since the yellow div has the m_isolatesBlending member set to true, it should fully paint, create a transparency layer, thus achieving isolation.
> 
> In other words, when m_isolatesBlending is set to true, the layer and its children should be fully painted.
> 
> What do you think of this approach? Do you see any other alternatives?

Sorry, wasn't attached to bug report. I meant that I didn't see from the expected result if the test passes or not. I would prefer a non-pixel test as you have. Is it possible from the expected file to see if the test passes? If yes, could you add a note in the test please?

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