[Webkit-unassigned] [Bug 95061] New: [Tests] Make fast/canvas/canvas-scale-shadowBlur.html in conformance with spec.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=95061

           Summary: [Tests] Make fast/canvas/canvas-scale-shadowBlur.html
                    in conformance with spec.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: luxtella at company100.net


This test failed on firefox because this test assumed the pixel apart from 2σ is #0000.
However, the pixel apart from 2σ is not #0000 mathematically. The exact value of
gaussian function f(2σ) is 0.1353. This means we should check
shouldBeTrue('d[0] == 255 && d[3] < 14'), but some platforms do not render
anything on the pixel apart from 2σ. i.e. skia.
So we need complex checking mechanism for d[0] and d[3] in order to be
harmonized with both the mathematical expectation and the practical expectation.

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