1867774 - Arc Stroke in HTML-Canvas has uneven and distorted line endings

Status: RESOLVED DUPLICATE of bug 1868067

(Core :: Graphics: Canvas2D, defect)

Description

[Wolfgang]

Attachment: Bildschirmfoto-2023-12-01-um-11.34.55.png

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:120.0) Gecko/20100101 Firefox/120.0

Steps to reproduce:

Trying to make a have circle with outline stroke in HTML5 Canvas Arc Function like this:

ctx.beginPath();
ctx.arc(0,0,20,0,Math.PI);
ctx.lineWidth = 40;
ctx.fillStyle = "#ff00ff";
ctx.strokeStyle = "#000000";
ctx.lineCap = "butt";
ctx.stroke();
ctx.fill();

Actual results:

The Line Endings of the stroke are uneven and distorted
Please see attached file with result in firefox and in chrome

Expected results:

The line endings should be even to the fill of the circle without distortion

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

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.

Comment 2

[Mayank Bansal]

can you :

1. Attach a reduced testcase to this bug?
2. Paste the contents of about:support here?

Comment 3

[Wolfgang]

https://jsfiddle.net/7osu6y1p/2/

i dont now what you mean by 2.)

Comment 4

[Wolfgang]

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Comment 5

[Mayank Bansal]

Thanks for the testcase and reporting the bug!

Regressed by:
Bug 1834079 - Move stroke fallback heuristic to after we attempt AA-Stroke. r=jrmuizel
Differential Revision: https://phabricator.services.mozilla.com/D178549

Comment 6

[Mayank Bansal]

Attachment: Reporters standalone testcase.html

Comment 7

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1834079

:lsalzman, since you are the author of the regressor, bug 1834079, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

Comment 8

[Donal Meehan [:dmeehan - PTO - Back Oct 13]]

:lsalzman could this be triaged for severity?

Comment 9

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1834079

Comment 10

[Lee Salzman [:lsalzman]]

This looks like a dup of bug 1868067 which Jeff is already working on. Going to move the testcase from this bug over there.