[Webkit-unassigned] [Bug 240807] New: [GPU Process] [Filters] Make PixelBuffer a RefCounted class

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240807

            Bug ID: 240807
           Summary: [GPU Process] [Filters] Make PixelBuffer a RefCounted
                    class
           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

The plan is to hide the underlying memory of PixelBuffer. GPUProcess needs to allocate shared memory and attribute it to the WebProcess.

Currently the PixelBuffer is created as std::optional<PixelBuffer> which does not allow sub-classing it. We need to create PixelBuffer as a pointer. In the software filter appliers code, there are instances that we need to ref-count the underlying memory 'Uint8ClampedArray' see FEGaussianBlurSoftwareApplier::ApplyParameters.

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