[Webkit-unassigned] [Bug 98446] New: [skia] Fix pixel spilling problem caused by image scaling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=98446

           Summary: [skia] Fix pixel spilling problem caused by image
                    scaling
           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: hclam at google.com
                CC: senorblanco at chromium.org, nduca at chromium.org,
                    nick at chromium.org


This change (http://trac.webkit.org/changeset/130412) caused pixel spilling when image is scaled with LANCZOS3 using skia::ImageOperations.

This fails fast/images/pixel-crack-image-background-webkit-transform-scale.html.

r130412 does an accurate scaled image extraction, when fancy scaling is used like lanczos pixels outside of the source rect are sampled for scaling and caused "spilling".

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