Bug 155029 - Blur filter escapes an enclosing overflow:hidden
Summary: Blur filter escapes an enclosing overflow:hidden
Status: RESOLVED FIXED
Alias: None
Product: WebKit
Classification: Unclassified
Component: CSS (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Simon Fraser (smfr)
URL: https://stripe.com/atlas
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2016-03-04 11:38 PST by Simon Fraser (smfr)
Modified: 2016-04-29 21:13 PDT (History)
8 users (show)

See Also:

Attachments
Patch (21.21 KB, patch)
2016-04-29 19:42 PDT, Simon Fraser (smfr) 		no flags Details | Formatted Diff | Diff
Patch (21.14 KB, patch)
2016-04-29 19:56 PDT, Simon Fraser (smfr) 		zalan: review+
Details | Formatted Diff | Diff
Show Obsolete (1) View All Add an attachment (proposed patch, testcase, etc.)

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Description Simon Fraser (smfr) 2016-03-04 11:38:57 PST 
https://jsfiddle.net/1edf4k9t/4/ shows a bug where a blur filter escapes an enclosing overflow:hidden
Comment 1 Simon Fraser (smfr) 2016-03-05 17:44:21 PST 
The clipping that RenderLayer::applyFilters() does is all wrong. The current code happens to never clip, because inside clipToRect(), clipRect.rect() == paintingInfo.paintDirtyRect. However, fixing that breaks filters that draw outside their bounds (blur, drop-shadow) because the backgroundRect used to clip is the pre-filtered background rect, taken from the paintDirtyRect.
Comment 2 Simon Fraser (smfr) 2016-04-01 10:53:44 PDT 
rdar://problem/25488747
Comment 3 Simon Fraser (smfr) 2016-04-29 19:42:18 PDT 
Created attachment 277783 [details]
Patch
Comment 4 Simon Fraser (smfr) 2016-04-29 19:56:38 PDT 
Created attachment 277784 [details]
Patch
Comment 5 Simon Fraser (smfr) 2016-04-29 21:13:28 PDT 
https://trac.webkit.org/r200283