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XPS differs from PS/PDF/etc in the way it handles miters; rather than
simply converting a miter that's overly long to a bevel, it truncates
it at the miter limit. As such it needs to be handled correctly.
For clarity, expose new enumerated types for linejoins and linecaps,
and use these throughout code.
When we upgrade our freetype, we can move to using proper xps mitering
in that too.
Add new fz_matrix_max_expansion function to return a safer expansion
value that works in the case where we scale up in one direction and
down in another.
In the xps path drawing code, avoid generating unnecessary linetos.
Thanks to Zeniko for spotting these and providing implementations.
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I don't remember exactly why I added it; but there are several
progressions when I remove it.
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Various fixes to avoid overflow problems, division by zeros, use
of uninitialised variables etc. All from/suggested by Zenikos patch.
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First, we add clipping rects to clipping functions. Various functions
(the ones that handle clipping) are now additionally passed a rectangle
that represents an additional bound for this clip in device space
(i.e. it has already been mapped through the current ctm).
Next, when constructing the displaylist, keep track of the bounding box
for the contents of each clip.
While writing the list, on every node we add, we add the bbox for that
node to the enclosing clips content bbox (if there is an enclosing clip).
When we pop a clip, write back to the corresponding push to update
the bbox.
This means if we get large clip regions, with only small areas used within
them, we will only do the slow blending for those small areas.
Finally, we fix a calculation in fz_bound_path which was incorrectly
accounting for mitrelimits. This was showing up in testing on page 630
of the PDF reference v1.7.
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The run-together words are dead! Long live the underscores!
The postscript inspired naming convention of using all run-together
words has served us well, but it is now time for more readable code.
In this commit I have also added the sed script, rename.sed, that I used
to convert the source. Use it on your patches and application code.
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