[Webkit-unassigned] [Bug 181179] New: Drawing to canvas make siblings be blurred when the parent is scaled.

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Dec 28 01:31:32 PST 2017


https://bugs.webkit.org/show_bug.cgi?id=181179

            Bug ID: 181179
           Summary: Drawing to canvas make siblings be blurred when the
                    parent is scaled.
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Canvas
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: baba at bpsinc.jp
                CC: dino at apple.com

Created attachment 330232

  --> https://bugs.webkit.org/attachment.cgi?id=330232&action=review

actual result

Overview:
In the following case, after drawing to the canvas, the "<p>" element is not rendered clearly.

- The "<p>" is the sibling of the "<canvas>" element.
- The parent of them is scaled by "transform: scale(10)".

Steps to reproduce:
Open http://jsfiddle.net/637gsay3/2/

Actual Results:
The texts will be blurred after the canvas is drawn. See the attached screenshot.

Expected Results:
The texts should be rendered clearly.

Confirmed environment:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/604.4.7 (KHTML, like Gecko) Version/11.0.2 Safari/604.4.7
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36

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