[Webkit-unassigned] [Bug 76850] New: Clipping of render layer boundaries does not take page scale into account

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=76850

           Summary: Clipping of render layer boundaries does not take page
                    scale into account
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: skyostil at google.com


The boundaries for render layers that are descendants of clipping containers (e.g., overflow: hidden) are incorrectly stored into the compositor's overlap map. The problem is that the boundaries are in scaled CSS coordinates while the clip rects are unscaled. The result is that the overlap check sometimes fails depending on the page geometry and scale.

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