[Webkit-unassigned] [Bug 142783] New: RenderLayerCompositor: only create backing for visible and non-empty layers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=142783

            Bug ID: 142783
           Summary: RenderLayerCompositor: only create backing for visible
                    and non-empty layers
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: j.isorce at samsung.com

Created attachment 248849
  --> https://bugs.webkit.org/attachment.cgi?id=248849&action=review
RenderLayerCompositor: only create backing for visible and non-empty layers

When there is at least one layer that requires compositing in the page, like accelerated canvas or so, all overlapped layers creates their own backing even if initially unvisible (and even with 0 width or height)

Not sure that the following patch has the best approach tough but worth to have a try on layout tests on webkit's buildbots.

Other approach could be to make the layer that are in the same zindex, use the same backing.

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