[Webkit-unassigned] [Bug 86792] New: Possibly redundant calls to convertToLayerCoords() in layer painting

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=86792

           Summary: Possibly redundant calls to convertToLayerCoords() in
                    layer painting
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simon.fraser at apple.com
                CC: mitz at webkit.org, jchaffraix at webkit.org,
                    enne at google.com, timothy_horton at apple.com


We noticed that convertToLayerCoords() was taking some time in some rendering tests. It's bad to call this during painting (because it walks all the way up to the root, so O(N^2)), yet we do so in a least two places when painting layers:

* RenderLayer::paintLayerContents() calls calculateRects() which calls convertToLayerCoords() to compute layerBounds
* intersectsDamageRect() calls boundingBox() which uses convertToLayerCoords()
* performOverlapTests() calls boundingBox() which uses convertToLayerCoords()

There may be more.

-- 
Configure bugmail: https://bugs.webkit.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.