cairo-xlib-surface needs to do the Xlib register extension hack so
that it can listen for a Display close event. When it gets that, it
needs to run through its caches and eliminate anything associated with
that display.

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cairo_image_surface_create should return a blank image
(eg. transparent black) instead of an image with random data in it.

--

The caches need to be invalidated at font destruction time.

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cairo_clip is really slow, (with at least the Xlib and image
backends). An accelerated implementation of the IN operator would
probably help a lot here.

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Splines are not dashed.

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The polygon tessellation routine has problems. It appears that the
following paper has the right answers:

	http://cm.bell-labs.com/cm/cs/doc/93/2-27.ps.gz

	[Hobby93c] John D. Hobby, Practical Segment Intersection with
	Finite Precision Output, Computation Geometry Theory and
	Applications, 13(4), 1999.

Recent improvements to make the intersection code more robust (using
128-bit arithmetic where needed), have exposed some of the weakness in
the current tessellation implementation. So, for now, filling some
polygons will cause "leaking" until we implement Hobby's algorithm.

--

Stroking a self-intersecting path generates the wrong answer, (in
mostly subtle ways). The fix is to tessellate a giant polygon for the
entire stroke outline rather than incrementally generating trapezoids.

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Cairo is crashing Xnest with the following message:

X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  72 (X_PutImage)
  Serial number of failed request:  28
  Current serial number in output stream:  29

confirmed on a quite default install of debian unstable.

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cairo_show_text is not updating the current point by the string's advance values.

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Caps are added only to the last subpath in a complex path.

--

ref_counts will go negative if destroy is called with ref_count ==
0. We noticed this in cairo_surface.c but it likely happens in several
places.

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font-size="0" in an SVG file does very bad things.

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cairo falls over with XFree86 4.2 (probably braindead depth handling
somewhere).