[Webkit-unassigned] [Bug 236574] New: [GPU Process] CSSFilter should be created only at the painting time

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=236574

            Bug ID: 236574
           Summary: [GPU Process] CSSFilter should be created only at the
                    painting time
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

CSSFilter::create() is called twice: 

(1) while doing the layout and creating the page layers. This call is mainly for calculating the filter outsets which is used for layer clipping. In this case we do not have a GraphicsContext
(2) while painting in RenderLayerFilters::beginFilterEffect(). In this case we do have a GraphicsContext

Building whole filter chain just to calculate the filter outsets is wrong. Instead we can use the FilterOperation and SVGFilterPrimitiveStandardAttributes superclasses to get their outsets without having to build the FilterEffects.

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