[Webkit-unassigned] [Bug 149144] New: [Win] Tiled drawing is render context more times than it should

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=149144

            Bug ID: 149144
           Summary: [Win] Tiled drawing is render context more times than
                    it should
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org

Errors in the Windows tiled drawing implementation cause WebKit to draw the same content multiple times. Furthermore, the nested CALayers used in the tiled drawing system caused the coordinate system to be flipped twice, causing some content to render upside down.

This patch corrects both of these problems. It also has the benefit of causing the debug border drawing for accelerated compositing to work properly on Windows.

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