Bug 65793

Summary: Painting of fixed background images is wrong in composited layers
Product: WebKit Reporter: Abel <abiboe>
Component: New BugsAssignee: Simon Fraser (smfr) <simon.fraser>
Status: RESOLVED FIXED    
Severity: Normal CC: bdakin, commit-queue, dino, eoconnor, esprehn+autocc, glenn, jens, menard, peter.lejeck, sam, simon.fraser, thorton
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: Mac (Intel)   
OS: OS X 10.7   
URL: http://vps708.directvps.nl/webkit/
Bug Depends on:    
Bug Blocks: 93136    
Attachments:
Description Flags
HTML file to recreate the bug
none
Patch sam: review+

Abel
Reported 2011-08-05 15:02:35 PDT
Elements with a fixed background image behave strange when an absolute positioned element has an animated transformation on hover. For example, the position of the background image in the div elements in the supplied changes position moves away during the animation, and returns to it's original position when the animation is finished. Hover over the black square to reproduce the bug.
Attachments
HTML file to recreate the bug (653 bytes, text/html)
2011-08-05 15:03 PDT, Abel 		no flags
Details
Patch (24.42 KB, patch)
2013-06-15 13:19 PDT, Simon Fraser (smfr) 		sam: review+
DetailsFormatted DiffDiff
View All Add attachment proposed patch, testcase, etc.
Abel
Comment 1 2011-08-05 15:03:59 PDT
Created attachment 103119 [details] HTML file to recreate the bug
Simon Fraser (smfr)
Comment 2 2011-08-06 19:21:29 PDT
Yeah, fixed backgrounds and animation don't play nicely together. Making them work would be very hard (or at least slow things down horribly).
Abel
Comment 3 2011-08-07 00:25:31 PDT
(In reply to comment #2) > Yeah, fixed backgrounds and animation don't play nicely together. Making them work would be very hard (or at least slow things down horribly). I understand that animating elements with a fixed background is hard, but the bug also occurs when elements without a fixed background are animated. No matter where the animated element is on the page, all the containers with fixed background display strange behavior.
Simon Fraser (smfr)
Comment 4 2013-06-15 13:04:05 PDT
*** Bug 102381 has been marked as a duplicate of this bug. ***
Simon Fraser (smfr)
Comment 5 2013-06-15 13:04:16 PDT
*** Bug 110552 has been marked as a duplicate of this bug. ***
Simon Fraser (smfr)
Comment 6 2013-06-15 13:05:23 PDT
*** Bug 117659 has been marked as a duplicate of this bug. ***
Simon Fraser (smfr)
Comment 7 2013-06-15 13:19:40 PDT
Created attachment 204773 [details] Patch
Sam Weinig
Comment 8 2013-06-15 20:44:56 PDT
Comment on attachment 204773 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=204773&action=review > Source/WebCore/rendering/RenderBoxModelObject.cpp:1227 > + // FIXME: transforms spec says that fixed backgrounds behave like scroll inside transforms. Since we have a bug on this, you should add the link. > Source/WebCore/rendering/RenderBoxModelObject.h:203 > + { } I prefer these on separate lines :(.
Simon Fraser (smfr)
Comment 9 2013-06-16 14:54:25 PDT
http://trac.webkit.org/changeset/151623
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