[Webkit-unassigned] [Bug 40778] New: [Qt] -webkit-transition-delay causes problems with GraphicsLayer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=40778

           Summary: [Qt] -webkit-transition-delay causes problems with
                    GraphicsLayer
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kevin.simons at nokia.com
                CC: noam.rosenthal at nokia.com


Created an attachment (id=58997)
 --> (https://bugs.webkit.org/attachment.cgi?id=58997)
Test with run-launcher -graphics-based

Attached is an example of a CSS transform that causes rendering/animation issues with GraphicsLayer/accelerated compositing (i.e. when QWebSettings::AcceleratedCompositingEnabled is true).

The example shows two boxes. When you click the screen, the right box (which is initially hidden) moves to the left and transforms to opacity 1, while the left box moves to the right and transforms to opacity 0 with a slight delay (using -webkit-transition-delay).

When AC is not enabled, the transforms work properly, but when it is enabled the box with the delayed animation disappears and then does not start it's transform until the other box finishes. Without the delay everything works fine with or without AC.

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