[Webkit-unassigned] [Bug 52603] New: Consider not allowing WebView::m_backingLayer to go into tiling mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=52603

           Summary: Consider not allowing WebView::m_backingLayer to go
                    into tiling mode
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Keywords: PlatformOnly
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: aroben at apple.com
                CC: simon.fraser at apple.com, cmarrin at apple.com


The fix for bug 52582 made WebView draw into a GraphicsLayer when in accelerated compositing mode. This GraphicsLayer can enter tiling mode if the window is more than 2000px wide or tall. It's possible that this could adversely affect performance, and we know of at least one visual glitch that occurs in tiling mode (bug 52602). We should investigate not allowing this layer to go into tiling mode at all, or perhaps raise the size threshold at which it enters tiling mode.

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