[Webkit-unassigned] [Bug 48738] New: GraphicsContext: Don't do full save/restore when painting with low quality scaling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=48738

           Summary: GraphicsContext: Don't do full save/restore when
                    painting with low quality scaling
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: Performance
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kling at webkit.org


When "useLowQualityScale" is true, GraphicsContext will currently save() and restore() in drawImage(), drawTiledImage() and drawImageBuffer().
This is unnecessary, we can just remember the current imageInterpolationQuality() and reset it after drawing.

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