460644 - black triangles when rendering svg

Status: VERIFIED FIXED

(Core :: Graphics, defect, P1)

Description

[Michael Gruenewald]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.0.3) Gecko/2008092417 Firefox/3.0.3 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.0.3) Gecko/2008092417 Firefox/3.0.3 (.NET CLR 3.5.30729)

Sometimes when loading an svg file, the svg is rendered with some black triangles which are not in the svg. This does only seem to happen when I load the file the first time or when I fully reload (Ctrl+F5) it. After a fast refresh (F5) everything seems to be ok.

Reproducible: Sometimes

Steps to Reproduce:
open or fully reload: http://upload.wikimedia.org/wikipedia/commons/9/91/BerlinDistricts_new.svg
Actual Results:  
some black triangles not in the svg file appear

Expected Results:  
correct rendering

Comment 1

[Ria Klaassen (not reading all bugmail)]

Confirmed with latest trunk on Windows XP.

Comment 2

[Ria Klaassen (not reading all bugmail)]

Works: 2008021322
Fails: 2008021323

Regression window: http://bonsai.mozilla.org/cvsquery.cgi?module=PhoenixTinderbox&date=explicit&mindate=2008-02-13+21%3A00&maxdate=2008-02-14+00%3A00
So this could be caused by Bug 416018.
This is also reproducible on a much faster Windows Vista with a different video card so it is not a slow computer's problem.

Comment 3

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

Jeff, can you take a look at this?

Comment 4

[Peter Weilbacher]

I can reproduce this on recent Hg-based builds on Linux on two different systems, like [Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1b2pre) Gecko/20081022 SeaMonkey/2.0a2pre] and [Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1b2pre) Gecko/20081022 Minefield/3.1b2pre], so this should probably be OS=All.

To see it I load the URL given and scroll around a bit, then lots of long black spikes appear. Once I cover that window with another one, the spikes/triangles disappear.

Comment 5

[Jeff Muizelaar [:jrmuizel]]

I put a smaller test case up at: http://people.mozilla.com/~jmuizelaar/BerlinDistricts-check.svg

I took out all the paths that didn't seem to cause any problems and was left with a bunch dashed paths with tiny dashes. (The bad rendering shows up red this time.)

It looks like the bug might be related to the leaky-dash test case in the cairo test suite...

Comment 6

[Robert Longson [:longsonr]]

Possibly similar to bug 418901 then?

Comment 7

[Jeff Muizelaar [:jrmuizel]]

This is now fixed in upstream cairo thanks to 22e2dac819de3c082424ebf3ce8f64c9c4797e8a.

Comment 8

[Ryan Jones-Ward [:sciguyryan]]

No longer seems reproducible with the latest hourly:

Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1b2pre) Gecko/20081106 Minefield/3.1b2pre