Bug 130556

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

Description zalan 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)

Comment 1 zalan 2014-03-20 20:24:07 PDT

LayoutTests/compositing/hidpi-absolute-subpixel-positioned-transformed-elements.html

Comment 2 zalan 2014-06-10 19:46:15 PDT

It was fixed in r169309.

Comment 3 Alexey Proskuryakov 2014-09-12 11:14:39 PDT

The test is still marked as failing in LayoutTests/TestExpectations