[Webkit-unassigned] [Bug 81546] New: [chromium] Use floating point scroll deltas for layers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=81546

           Summary: [chromium] Use floating point scroll deltas for layers
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: skyostil at google.com
                CC: jamesr at chromium.org
            Blocks: 73350


The Chromium compositor should use floating point scroll deltas to keep track of layer scroll offsets relative the main thread. This is because due to page scaling it may be necessary to scroll layers in sub-CSS-pixel steps to avoid visible jumps. When the floating point scroll offset is committed to the main thread, it is truncated to integer, but the fractional part is kept on the CC side to make sure fractional scroll offsets are accumulated correctly over multiple commits.

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