[Webkit-unassigned] [Bug 217596] New: [GPU Process] Cache the BitmapImage frame in GPU Process and allow referencing it with its RemoteResourceIdentifier

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217596

            Bug ID: 217596
           Summary: [GPU Process] Cache the BitmapImage frame in GPU
                    Process and allow referencing it with its
                    RemoteResourceIdentifier
           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

Currently we draw the NativeImage into a ShareableBitmap and send it to the GPU Process. The GPU Process receives the ShareableBitmap and convert it to a NativeImage. These steps happen every time the same NativeImage is drawn. This would require memory, CPU cycles and IPC communications. We need to cache the BitmapImage frame once and reference it with its RemoteResourceIdentifier.

The life cycle of the cached NativeImages will be determined by the Web Process. If the BitmapImage decides to destroy its decoded data, the GPU Process will delete the same NativeImages which correspond to the same deleted decoded frames.

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