Bug 35780

Summary:	cairo_pattern_create_radial(rx,ry,r,rx,ry,r) not working
Product:	cairo	Reporter:	guo <guolingy>
Component:	general	Assignee:	Carl Worth <cworth>
Status:	RESOLVED NOTABUG	QA Contact:	cairo-bugs mailing list <cairo-bugs>
Severity:	blocker
Priority:	highest	Keywords:	regression
Version:	1.10.3
Hardware:	x86 (IA32)
OS:	All
Whiteboard:
i915 platform:		i915 features:
Attachments:	Result I excepted

Description guo 2011-03-29 19:15:25 UTC

Want to create a radial gradient with start circle and end circle are the same, but not working, the test code is the same with cairo default test code

cairo\test\degenerate-radial-gradient.c

Comment 1 Andrea Canciani 2011-03-30 00:18:28 UTC

Can you provide additional details about what is not working?
In particular, the backend you are using, the cairo revision and the result vs the expected result.

The expected result for a degenerate radial gradient like the one you are describing should be a transparent pattern.

Comment 2 guo 2011-03-30 02:01:05 UTC

Created attachment 45035 [details]
Result I excepted

Comment 3 Andrea Canciani 2011-03-30 02:02:41 UTC

To get that result, the two extreme circles shoud *not* be the same.

Comment 4 Andrea Canciani 2011-03-30 02:06:58 UTC

The documentation is quite lacking, but you can find the definition of the radial gradients here:
http://cgit.freedesktop.org/pixman/tree/pixman/pixman-radial-gradient.c#n151

You probably wanted to do something like cairo_pattern_create_radial(rx,ry,r,rx,ry,0).

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