[Webkit-unassigned] [Bug 125133] New: [Coordinated Graphics] An element with background-size:cover is drawn incorrectly under certain condition.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=125133

           Summary: [Coordinated Graphics] An element with
                    background-size:cover is drawn incorrectly under
                    certain condition.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
               URL: http://black.company100.com/test/background-size-cover
                    /
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jgjeong at company100.net
                CC: ryumiel at company100.net


It is appeared in EFL. I checked at r159833.

Test:
  http://black.company100.com/test/background-size-cover/

The color of rightmost pixel is expected to be cyan.
Google Chrome 27 works correctly.
EFL MiniBrowser displays black pixel at rightmost.


I found 2 reappearance conditions.
The gap is appeared if at least one of the conditions is true.

1. Set position style of the element to fixed
  { position: fixed; }
2. Make the element an AC layer.
  { -webkit-transform: translateZ(0); }

The above test applies 2nd condition only. ( position: absolute, -webkit-transform: translateZ(0). )

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