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Adobe Reader and Microsoft XPS viewer differ in their handling of
non-empty dashed strokes where the phase is 0: Adobe Reader considers
these to be faulty and omits them while Microsoft XPS Viewer renders
them the same as an empty dash (i.e. solid).
This patch makes Fitz no longer render such strokes and ensures that
MuXPS never emits them so that the desired behavior results (this is
the easier implementation since XPS rendering code renders stroked
paths in a single location whereas PDF rendering does it all over the
place).
See https://code.google.com/p/sumatrapdf/issues/detail?id=2339 for a
testcase.
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Many times, the idiom p.x = x; p.y = y; fz_transform_point() is used.
This function should simplify that use case by both initializing and
transforming the point in one call.
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xps_parse_color happily reads more than FZ_MAX_COLORS values out of a
ContextColor array which overflows the passed in samples array.
Limiting the number of allowed samples to FZ_MAX_COLORS and make sure
to use that constant for all callers fixes the problem.
Thanks to Jean-Jamil Khalifé for reporting and investigating the issue
and providing a sample exploit file.
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fz_clip_path takes a rect parameter, but all the callers of it use
NULL. In most cases they have a perfectly reasonable value that they
could pass to hand anyway. Update the code to pass this value, which
saves the need for the scissor stack keeping code to recalculate it.
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