401791 - Canvas miterLimit ignored on axis-aligned corners

Status: RESOLVED FIXED

(Core :: Graphics, defect, P3)

Description

[Philip Taylor]

User-Agent:       Opera/9.24 (X11; Linux i686; U; en)
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9a9pre) Gecko/2007103004 Minefield/3.0a9pre

When drawing a stroked box with lineJoin = 'miter' and small miterLimit, the corners should be bevelled (because the miters would exceed the limit).

Reproducible: Always

Steps to Reproduce:
See URL.

Actual Results:  
The corners are bevelled if the box is rotated a tiny bit, but are incorrect if it isn't.

Expected Results:  
The corners should be bevelled, independent of any transformations.

Worked correctly in FF2. (I assume this is a general Cairo issue, not specifically canvas.)

Comment 1

[Boris Zbarsky [:bzbarsky]]

Current hypothesis is that this bug is causing the test_2d.line.miter.rightangle.html and test_2d.line.miter.lineedge.html tests in content/canvas/test to fail on Linux and Windows, but not Mac.  Confirming based on the difference in platrform behavior, which does in fact seem like a cairo bug.

Comment 2

[Mike Schroepfer]

Vlad/Pav thoughts on this?

Comment 3

[Mike Schroepfer]

Vlad/pav moving to blocking P3.  If you disagree adjust...

Comment 4

[Vladimir Vukicevic [:vlad] [:vladv] (needinfo me, slow to respond)]

Yay, fixed.