Bug 83190

Summary: Shadows clipped on position:fixed composited layers
Product: WebKit Reporter: Vangelis Kokkevis <vangelis>
Component: Layout and RenderingAssignee: Dean Jackson <dino>
Status: RESOLVED DUPLICATE    
Severity: Normal CC: enne, jamesr, jchaffraix, simon.fraser, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: 528+ (Nightly build)   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
Reduced test case
none
Updated reduction none

Vangelis Kokkevis
Reported 2012-04-04 12:21:36 PDT
This bug was originally reported in: http://code.google.com/p/chromium/issues/detail?id=121102 Composited layers seem to clip out shadow region corresponding to a -webkit-box-shadow property. Steps to reproduce: (WebKit in 10.7 with accelerated canvas or Chrome) 1. Open http://www.tsetmc.com/Loader.aspx?ParTree=151311&i=23441366113375722 2. Click 's' to open the popup div with the box shadow 3. Resize the main window until the popup overlaps the graph at the top left At that point, the popup gets promoted to a composited layer and loses it shadow (and a chunk of its border). The composited layer borders reveal that the layer created is really too small. An alternative way to trigger the bug on the same page is to simply add a -webkit-transform: translateZ(0) on the popup div's content.
Attachments
Reduced test case (643 bytes, text/html)
2012-04-20 00:41 PDT, Dean Jackson 		no flags
Details
Updated reduction (705 bytes, text/html)
2012-04-20 09:41 PDT, Dean Jackson 		no flags
Details
Show Obsolete (1) View All Add attachment proposed patch, testcase, etc.
Simon Fraser (smfr)
Comment 1 2012-04-04 13:04:03 PDT
When did this regress? r111456?
Vangelis Kokkevis
Comment 2 2012-04-04 13:15:33 PDT
(In reply to comment #1) > When did this regress? r111456? I'm not sure it's a regression, and if it is, it's probably not very recent. I see the same behavior in (official) Safari 5.1.3 (7534.53.10) .
Simon Fraser (smfr)
Comment 3 2012-04-06 17:11:12 PDT
*** Bug 83381 has been marked as a duplicate of this bug. ***
Simon Fraser (smfr)
Comment 4 2012-04-06 17:12:16 PDT
This needs to be looked soon.
Radar WebKit Bug Importer
Comment 5 2012-04-06 17:12:37 PDT
<rdar://problem/11204762>
Dean Jackson
Comment 6 2012-04-20 00:41:06 PDT
Created attachment 138056 [details] Reduced test case Here's a pretty simple reduction. Edit the marked point in the file to toggle the correct and incorrect results.
Simon Fraser (smfr)
Comment 7 2012-04-20 08:04:32 PDT
We're probably using the wrong clip rect for position:fixed things. Does it only repro with position:fixed?
Dean Jackson
Comment 8 2012-04-20 09:41:22 PDT
Created attachment 138107 [details] Updated reduction
Simon Fraser (smfr)
Comment 9 2012-04-20 09:52:06 PDT
I think this is a dup of bug 63331
Dean Jackson
Comment 10 2012-04-20 11:58:29 PDT
*** This bug has been marked as a duplicate of bug 63331 ***
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