Open
Bug 1862925
Opened 1 year ago
Updated 6 months ago
globalCompositeOperation makes 2d canvas without alpha channel transparent (Mac)
Categories
(Core :: Graphics: Canvas2D, defect, P3)
Tracking
()
UNCONFIRMED
People
(Reporter: benni.vetter, Unassigned)
References
(Regression)
Details
(Keywords: regression)
Attachments
(1 file)
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473 bytes,
text/html
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Details |
Steps to reproduce:
https://bitbof.github.io/browser-bug-demos/2023-11-03-firefox-canvas-alpha/
- On M1 Mac, Ventura 13.3.1 (works as expected on Windows)
- Create a 2d context with option alpha: false -> it should have no alpha channel
- set globalCompositeOperation to "destination-out"
- fillRect
Actual results:
fillRect creates transparent pixels. The background becomes visible.
Expected results:
The canvas stays opaque.
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Comment 1•1 year ago
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The Bugbug bot thinks this bug should belong to the 'Core::Graphics: Canvas2D' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.
Component: Untriaged → Graphics: Canvas2D
Product: Firefox → Core
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Reporter | |
Updated•1 year ago
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Summary: globalCompositeOperation violates 2d context without alpha channel (mac) → globalCompositeOperation makes 2d canvas without alpha channel transparent (Mac)
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Comment 2•1 year ago
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Keywords: regression
Regressed by: 1773712
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Comment 3•1 year ago
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:lsalzman, since you are the author of the regressor, bug 1773712, could you take a look? Also, could you set the severity field?
For more information, please visit BugBot documentation.
Flags: needinfo?(lsalzman)
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Updated•1 year ago
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Severity: -- → S3
Priority: -- → P3
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Updated•6 months ago
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Flags: needinfo?(lsalzman)
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Description
•