CSS conic-gradient the edges are blurred
Categories
(Core :: Graphics, defect, P3)
Tracking
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People
(Reporter: jieorlin, Unassigned)
References
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Details
(Keywords: parity-safari)
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36
Steps to reproduce:
Open:
data:text/html;charset=UTF-8,<style>html{background: repeating-conic-gradient(at left, black 0 2%, white 0 4%); min-height: 100%}</style>
Chrome bug: https://bugs.chromium.org/p/chromium/issues/detail?id=709330
Expected results:
No sawteeth, as smooth as SVG rendering.
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Comment 1•5 years ago
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Bugbug thinks this bug should belong to this component, but please revert this change in case of error.
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Updated•5 years ago
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Comment 2•5 years ago
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Thanks for reporting! Since the bug report seems to be filed from macOS and Chromium is affected as well, I assume this was reported for Skia.
The current implementation uses SkGradientShader::MakeSweep method of the Skia library:
https://searchfox.org/mozilla-central/rev/7fba7adfcd695343236de0c12e8d384c9b7cd237/gfx/2d/DrawTargetSkia.cpp#531
similar to what Chromium does:
https://github.com/chromium/chromium/blob/c20d681c9c067c4e15bb1408f17114b9e8cba294/third_party/blink/renderer/platform/graphics/gradient.cc#L327
This needs to be fixed upstream.
I haven't checked if this affects WebRender though.
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Comment 3•5 years ago
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It seems like the Chromium bug has been closed even though I see the same blurry rendering on Chromium.
Chrome has not been fixed yet. see also: https://bugs.chromium.org/p/skia/issues/detail?id=6470
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Comment 5•5 years ago
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(In reply to jieorlin from comment #4)
Chrome has not been fixed yet. see also: https://bugs.chromium.org/p/skia/issues/detail?id=6470
Thanks for finding the bug report!
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Comment 6•5 years ago
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Looks like this will be solved once Skia fixes it and we update the skia dependency.
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Comment 7•4 years ago
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Because this bug's Severity has not been changed from the default since it was filed, and it's Priority is P3 (Backlog,) indicating it has been triaged, the bug's Severity is being updated to S3 (normal.)
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Comment 8•6 months ago
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Nowadays, we have the opposite issue: webrender does not anti-alias hard gradient stops so they are pixelated. We don't use skia to render css gradients anymore except in a few rare exceptions so I'll close this.
Description
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