Bug 16589 - CAIRO_FILL_RULE_WINDING does not work with some ellipses
Summary: CAIRO_FILL_RULE_WINDING does not work with some ellipses
Status: RESOLVED NOTABUG
Alias: None
Product: cairo
Classification: Unclassified
Component: general (show other bugs)
Version: 1.6.4
Hardware: Other All
: medium normal
Assignee: Carl Worth
QA Contact: cairo-bugs mailing list
URL: https://bugzilla.novell.com/show_bug....
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2008-07-02 14:05 UTC by Sebastien Pouliot
Modified: 2008-07-02 14:29 UTC (History)
0 users

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Attachments
test case (1.66 KB, text/plain)
2008-07-02 14:05 UTC, Sebastien Pouliot 		Details
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Description Sebastien Pouliot 2008-07-02 14:05:33 UTC 
Created attachment 17481 [details]
test case

The expected "all filled" of an ellipse and a box inside the same path/fill operation does not work with the attached test case.

Notes:

* the original test case (XAML file) had three ellipses and one box. All three ellipses shows the same problem (rendered as even odd).

* Tested with Cairo 1.6.4 but this does not appear to be a new issue since I could duplicate the problem with Cairo 1.4.8.

* I suspect this also cause problems for any Cairo-based SVG renderers, try the following PML:

F0 M13.5 13.5 C13.5,6.04375 7.45703,0.00078125 0,0.00078125 C-7.45703, 0.00078125 -13.5, 6.04375 -13.5, 13.5008 C-13.5, 20.9539  -7.45703, 27.0008 0, 27.0008 C7.45703, 27.0008 13.5, 20.9539 13.5, 13.5008 M0, 0.00078125 L353, 0.00078125 L353, 27.0008 L0, 27.0008 L0, 0.00078125
Comment 1 M Joonas Pihlaja 2008-07-02 14:29:00 UTC 
The attached code draws the circle counter clockwise and the box clockwise, so the intersection of the two has zero winding number.

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