[Webkit-unassigned] [Bug 46918] New: ContextShadow should not use the blur radius as kernel size of the box blurs

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=46918

           Summary: ContextShadow should not use the blur radius as kernel
                    size of the box blurs
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: alex at igalia.com
                CC: krit at webkit.org, ariya.hidayat at gmail.com,
                    mrobinson at webkit.org


Currently we are using the blur radius in ContextShadow directly as the kernel size when blurring, this is causing a bigger blurring effect than expected. We should calculate the kernel size required to get a blur effect which size is like the blur radius. We were using before 2/3 of the blur radius, because we are adding kernel_size/2 pixels with each box blur, therefore with 3 box blurs we get 3*kernel_size/2 more pixels, which should be the blur radius. Firefox is applying a similar solution.

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