[Webkit-unassigned] [Bug 193018] New: Incorrect blur with large radius

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193018

            Bug ID: 193018
           Summary: Incorrect blur with large radius
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jonathan at tumult.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 358033

  --> https://bugs.webkit.org/attachment.cgi?id=358033&action=review

Screenshot of incorrect and correct renderings

A blur with a large radius shows graphical corruption.  This can be reproduced very simply via:

<div style="background-color: rgb(255, 235, 200);  width: 450px; height: 446px; filter: blur(75px);"></div>

Please see the attached screenshot. It appears pink!

There are various blur values that can make it look good or bad; I found 68px looks fine but 69px looks incorrect.

One workaround is to use a "transform:rotateY(0deg)" style, but this isn't a valid workaround for us in all cases for other reasons.

This affects Tumult Hype (http://tumult.com/hype/).

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