Bug 130556

Summary: Subpixel rendering: transform: rotate(90, 180, 270) moves square box when the box is positioned on subpixel.
Product: WebKit Reporter: alan <zalan>
Component: Layout and RenderingAssignee: Nobody <webkit-unassigned>
Status: RESOLVED FIXED    
Severity: Normal CC: simon.fraser
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: Unspecified   
OS: Unspecified   

alan
Reported 2014-03-20 20:20:37 PDT
as the result of flooring at RenderLayer::paintLayerByApplyingTransform() and painting the box with the subpixel adjustment on the rotated context. (in case of 180deg, subpixel adjustment pushes the box upwards)
Attachments
Add attachment proposed patch, testcase, etc.
alan
Comment 1 2014-03-20 20:24:07 PDT
LayoutTests/compositing/hidpi-absolute-subpixel-positioned-transformed-elements.html
alan
Comment 2 2014-06-10 19:46:15 PDT
It was fixed in r169309.
Alexey Proskuryakov
Comment 3 2014-09-12 11:14:39 PDT
The test is still marked as failing in LayoutTests/TestExpectations
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