[Webkit-unassigned] [Bug 169586] New: Subpixel rendering causes repainting compositing layers moved by CSS animation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169586

            Bug ID: 169586
           Summary: Subpixel rendering causes repainting compositing
                    layers moved by CSS animation
    Classification: Unclassified
           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: Hironori.Fujii at sony.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 304349
  --> https://bugs.webkit.org/attachment.cgi?id=304349&action=review
test case of moving compositing layers by CSS animation

Subpixel rendering causes repainting compositing layers moved by CSS animation.
This seems the intended effect of subpixel rendering.
But, this degrades CSS animation performance.
I think WebKit needs a solution, for example disabling subpixel rendering.

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