[Webkit-unassigned] [Bug 90078] New: [Texmap] Incorrect Z-ordering in texture mapper layer with AC

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=90078

           Summary: [Texmap] Incorrect Z-ordering in texture mapper layer
                    with AC
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: svillar at igalia.com
                CC: alex at igalia.com, mrobinson at webkit.org,
                    noam.rosenthal at nokia.com


Created an attachment (id=149755)
 --> (https://bugs.webkit.org/attachment.cgi?id=149755&action=review)
Simple z-ordering test

I think Z-ordering has some issues in TextureMapperLayer. I'm attaching a test case which consists on the following

- a 300x300 blue div with no transparency defining a new rendering context (preserve-3d)
- a smaller lime div translated -100px in the Z axis

The problem is that the lime div is always visible no matter if the blue div covers it. I just added some animation to make it clearer but it can be safely removed and the bug will be visible as well.

Correct me if I'm wrong but it looks like that when computing the z-ordering, that is only done for the children, so they will be always painted no matter if the first layer obscures them or not.

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