[Webkit-unassigned] [Bug 92492] New: [Texmap] Remove the backing store after 'style.visibility' for an element sets 'hidden'.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=92492

           Summary: [Texmap] Remove the backing store after
                    'style.visibility' for an element sets 'hidden'.
           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


This patch's purpose is to save vram memory.
When visibility of the element sets hidden, we do not need to draw the element,
so we do not need to keep a texture of the backing store.
Currently, Texmap does not draw the element with visibility:hidden because
RenderLayerBacking::paintIntoLayer does not draw anything.
This patch just removes unused textures.

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