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20e3a99bba
The TrueType font subsetting code fails to emit VHEA/VMTX headers for the font, so WMode 1 doesn't work to switch to vertical metrics. Added a bug about this, and changed the PS/PDF output code to just use Type3 in this case until the bug is fixed. Updated the reference images to match the output for PDF/PS backends for the vertical font check.
56 lines
1.4 KiB
Text
56 lines
1.4 KiB
Text
The place to find a current list of known bugs for cairo is:
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http://bugs.freedesktop.org
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under either the cairo or libpixman products. New bugs should be
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reported there as well.
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[A few old bugs have not been moved to bugs.freedesktop.org and are
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instead listed below:]
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--
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The caches need to be invalidated at font destruction time.
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--
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The polygon tessellation routine has problems. It appears that the
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following paper has the right answers:
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http://cm.bell-labs.com/cm/cs/doc/93/2-27.ps.gz
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[Hobby93c] John D. Hobby, Practical Segment Intersection with
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Finite Precision Output, Computation Geometry Theory and
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Applications, 13(4), 1999.
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Recent improvements to make the intersection code more robust (using
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128-bit arithmetic where needed), have exposed some of the weakness in
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the current tessellation implementation. So, for now, filling some
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polygons will cause "leaking" until we implement Hobby's algorithm.
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--
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Stroke extents might not work for degenerate cases, (e.g. single
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vertical or horizontal line).
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--
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Stroke width of 0 might do bad things.
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--
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Could there be a bug in PS backend exposed by?:
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cairo_save
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cairo_clip
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cairo_restore
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...
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This needs a new testcase.
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--
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Text drawn with vertical metrics cannot currently use TrueType
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subsetting for PDF/PS output as the code doesn't write out the necessary
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VHEA or VMTX entries to the TrueType font objects. As a result, cairo uses
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Type3 fonts which generates slightly different outlines.
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