[Webkit-unassigned] [Bug 243816] New: [Filters] Support CoreGraphics filters

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243816

            Bug ID: 243816
           Summary: [Filters] Support CoreGraphics filters
           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

Software filters use ImageBuffers to generate the result of their applying to the target element. These buffers can take significant amount of memory if the target element is large or the number of effects are big.

CoreGraphics provides a better way to apply FilterEffects. A CGStyle can be used to apply the a FilterEffect to the current drawing. Also beginTransparencyLayer()/endTransparencyLayer() can be used to force applying the FilterEffect only when composting the layer to the destination GraphicsContext. This will treat the drawing commands between beginning and ending the transparency layer as a unit of drawing.

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