[Webkit-unassigned] [Bug 107656] New: Coordinated Graphics: CoordinatedLayerTreeHost::sizeDidChange uses the size in css unit, not device unit.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=107656

           Summary: Coordinated Graphics:
                    CoordinatedLayerTreeHost::sizeDidChange uses the size
                    in css unit, not device unit.
           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: luxtella at company100.net


CoordinatedLayerTreeHost::sizeDidChange set the size of WebPage to GraphicsLayer, and the size is in device units.

void CoordinatedLayerTreeHost::sizeDidChange(const WebCore::IntSize& newSize)
{
    if (m_rootLayer->size() == newSize)
        return;

    m_rootLayer->setSize(newSize);

    // If the newSize exposes new areas of the non-composited content a setNeedsDisplay is needed
    // for those newly exposed areas.
    FloatSize oldSize = m_nonCompositedContentLayer->size();
    m_nonCompositedContentLayer->setSize(newSize);
    ...
}

But all other child layer has the size in css unit.

I don't find any artifact yet, because TBS paints entire contents for non composited layer. But it is a potential bug.

In addition, I'm not sure if WebPage should use the size in device unit.

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