[Webkit-unassigned] [Bug 154233] New: CSS filter causes unnecessary backing store allocation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=154233

            Bug ID: 154233
           Summary: CSS filter causes unnecessary backing store allocation
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: simon.fraser at apple.com

Created attachment 271320
  --> https://bugs.webkit.org/attachment.cgi?id=271320&action=review
Testcase

A simple container compositing layer (e.g. one with just background color) ends up getting backing store if it has a compositable filter, because hasBoxDecorations() tests for filters.

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