[Webkit-unassigned] [Bug 41195] New: [chromium] Drag images look wrong

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=41195

           Summary: [chromium] Drag images look wrong
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: thakis at chromium.org


DragImageChromiumSkia contains this:

            *pixel = SkPreMultiplyARGB(SkColorGetA(*pixel) * fraction,
                                       SkColorGetR(*pixel),
                                       SkColorGetG(*pixel),
                                       SkColorGetB(*pixel));

That's wrong: *pixel already contains premultiplied rgb, and calling SkPreMultiplyARGB() again multiplies rgb by the new alpha again. Instead, SkPackARGB should be called.

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