Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: cbf44125e63ae2079d99d27f049cd7b70a3b3f89
https://github.com/WebKit/WebKit/commit/cbf44125e63ae2079d99d27f049cd7b70a3b3f89
Author: Taher Ali <[email protected]>
Date: 2026-07-13 (Mon, 13 Jul 2026)
Changed paths:
A
LayoutTests/imported/w3c/web-platform-tests/css/css-viewport/zoom/box-shadow-inset-spread-expected.html
A
LayoutTests/imported/w3c/web-platform-tests/css/css-viewport/zoom/box-shadow-inset-spread.html
A
LayoutTests/imported/w3c/web-platform-tests/css/css-viewport/zoom/reference/box-shadow-inset-spread-ref.html
M Source/WebCore/rendering/BorderShape.cpp
M Source/WebCore/rendering/BorderShape.h
Log Message:
-----------
Inset box-shadow spread renders uneven thickness at fractional zoom
https://bugs.webkit.org/show_bug.cgi?id=306014
rdar://169167365
Reviewed by Simon Fraser.
An inset box-shadow used as a 1px rule (e.g. `box-shadow: inset 0 0 0 1px`)
rendered thicker on some sides than others at fractional zoom, because the
outer border box and the inner hole were snapped to device pixels
independently and a fractional-width spread rounded up on one side and down
on the other.
Derive the snapped inner rect from the already-snapped outer rect, insetting
each side by the width rounded to whole device pixels, so the thickness is
uniform on all four sides regardless of sub-pixel position.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-viewport/zoom/box-shadow-inset-spread-expected.html:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-viewport/zoom/box-shadow-inset-spread.html:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-viewport/zoom/reference/box-shadow-inset-spread-ref.html:
Added.
* Source/WebCore/rendering/BorderShape.cpp:
(WebCore::BorderShape::fillRectWithInnerHoleShape const):
(WebCore::BorderShape::snappedInnerEdgeRectForPainting const):
* Source/WebCore/rendering/BorderShape.h:
Canonical link: https://commits.webkit.org/317080@main
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