[Webkit-unassigned] [Bug 115158] New: Account for CTM scale when deciding the image resampling algorithm.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=115158

           Summary: Account for CTM scale when deciding the image
                    resampling algorithm.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: simon.fraser at apple.com, dino at apple.com,
                    benjamin at webkit.org


We might want to consider merging:

https://chromium.googlesource.com/chromium/blink/+/b772b4d7c24b66bebba703fd2ef89fbe73ea1935

Account for CTM scale when deciding the image resampling algorithm.

ImageQualityController considers the image size and layout size when
computing which resampling algorithm to use, but did not account
for the current transform. This was noticable as 'bouncing' when
scaling an image direclty with a transform.

This patch incorporates the context's CTM (which includes scale
but not zoom) into the resampling calculation. Because the
ImageQualityController runs on a 500ms timer, a manual test
has been added.

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