[Webkit-unassigned] [Bug 153400] New: RenderLayer::setupFontSubpixelQuantization() needs to be improved

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=153400

            Bug ID: 153400
           Summary: RenderLayer::setupFontSubpixelQuantization() needs to
                    be improved
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: bdakin at apple.com, simon.fraser at apple.com

When dumping drawing commands with display lists, WK1 and WK2 differ in the setting of fontSubpixelQuantization in compositing layers between WK1 and WK2, which doesn't make sense.

The current code asks if scrolling is on the main thread, whether content scrolls by painting, and if live zooming is happening. This doesn't take into account compositing layers that are moved by scrolling, and so does the wrong thing for layers in WK1.

I think the correct solution will have to pass flags down through the painting code, to note whether we've seen a scrollable layer on the way down.

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