[Webkit-unassigned] [Bug 170353] New: REGRESSION(r214635): Calculate image subsampling only for CG

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=170353

            Bug ID: 170353
           Summary: REGRESSION(r214635): Calculate image subsampling only
                    for CG
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com

In the <http://trac.webkit.org/changeset/214635>, we needed to calculate the image scaling factor for all platforms. It was needed do the calculation: sizeForDrawing = sizeOfImage * imageScaleFactor. But this makes ImageSource::subsamplingLevelForScale() now returns a SubsamplingLevel not equal to SubsamplingLevel::Default if the scaleFactor is greater than { 1, 1} for all platforms. The subsamplingLevel should only be used for CG.

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