[Webkit-unassigned] [Bug 91075] New: [Qt] Increase the drawing performance by merging dirty rects.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=91075

           Summary: [Qt] Increase the drawing performance by merging dirty
                    rects.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Platform
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: luxtella at company100.net


QWebFramePrivate calls FrameView::paintContents as many as the number of dirty
rects, so it causes too many redundant render tree traversals.
I changed it to merge dirty rects and call FrameView::paintContents only once.

The algorithm to merge rects is copied from GTK.

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