902879 - SVG rendering error (protrusion) with hardware acceleration enabled

Status: RESOLVED DUPLICATE of bug 854296

(Core :: Graphics, defect)

Description

[bjornkl]

Attachment: scree_dump.png

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0 (Beta/Release)
Build ID: 20130618035212

Steps to reproduce:

Tried to render two lines as polygons. They should not cross:

<!--?xml version="1.0" encoding="UTF-8"?-->
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
<svg style="fill-opacity:1; stroke:black;" xmlns="http://www.w3.org/2000/svg"  xlink="http://www.w3.org/1999/xlink" height="30" width="30">
<g transform="translate(10,10)" >
<polygon style="fill:none; stroke-width:1;" points=" 0 5 0 -5"></polygon>
<polygon style="fill:none; stroke-width:1;" points=" 0 5 -5 5"></polygon>
</g>
</svg>



Actual results:

The two lines cross (intersect). See attached screen-dump.


Expected results:

The two lines should meet at [0,5]

Comment 1

[Jonathan Watt [:jwatt]]

Attachment: testcase as attachment

Comment 2

[Robert Longson [:longsonr]]

Seems to be connected with hardware acceleration. Turning it off stops the protrusion.

Comment 3

[Loic]

Regression range:
good=2012-05-23
bad=2012-05-24
http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=36e938e51481&tochange=f43e8d300f21

Suspected: 
Bas Schouten — Bug 715768: Enable Azure-Thebes wrapper by default for D2D. r=jrmuizel