[Webkit-unassigned] [Bug 128256] New: [iOS] TileController should not rely on TileCache zooming mode for tile scale multiplier

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=128256

           Summary: [iOS] TileController should not rely on TileCache
                    zooming mode for tile scale multiplier
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: psolanki at apple.com
                CC: koivisto at iki.fi, simon.fraser at apple.com


The Zooming tiling mode in TileCache is not always accurate. UIKit sets it to Zooming even in cases when it does a pan instead of a zoom. In such situations we can end up with blurry tiles created with 0.125 scale factor. See RenderLayerCompositor::contentsScaleMultiplierForNewTiles().

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