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In general, we should use 'const fz_blah' in device calls whenever
the callee should not alter the fz_blah.
Push this through. This shows up various places where we fz_keep
and fz_drop these const things.
I've updated the fz_keep and fz_drops with appropriate casts
to remove the consts. We may need to do the union dance to avoid
the consts for some compilers, but will only do that if required.
I think this is nicer overall, even allowing for the const<->no const
problems.
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We can now group all clipped text into one fz_text object and simplify
the device interface.
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Less risk of confusion with the text type used in the device interface.
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MuPDF (the win32/linux viewer) leaks a span_soup each time it
is run, even if (seemingly to the user) no text extraction
operations are done.
This is because the view does a text extraction pass silently,
during which 'begin_page' is called for both page contents and
annotation contents. This causes a leak of a span_soup.
Change the implementation to allocate the span_soup just in time
instead.
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When advancing a glyph in vertical mode, it should advance down the page.
The origin of the glyph as supplied is bottom left, not top right - allow
for this in calculations. Previously glyphs were not being collated into
spans because of this.
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In vertical motion mode, when calculating bboxes we should use
horizontal rather vertical displacements from the 'axis of
movement'.
In horizontal mode, we displace by 'ascender' and 'descender'.
Those concepts don't rotate with the motion mode, so repurpose
those fields to hold bbox.x0 and bbox.x1 in vertical mode.
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We were not filling in the matrix and bbox fields for images
collected as part of the text extraction device. Fixed here.
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Thanks to malc for pointing out the problem.
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Purge several embedded contexts:
Remove embedded context in fz_output.
Remove embedded context in fz_stream.
Remove embedded context in fz_device.
Remove fz_rebind_stream (since it is no longer necessary).
Remove embedded context in svg_device.
Remove embedded context in XML parser.
Add ctx argument to fz_document functions.
Remove embedded context in fz_document.
Remove embedded context in pdf_document.
Remove embedded context in pdf_obj.
Make fz_page independent of fz_document in the interface.
We shouldn't need to pass the document to all functions handling a page.
If a page is tied to the source document, it's redundant; otherwise it's
just pointless.
Fix reference counting oddity in fz_new_image_from_pixmap.
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Rename fz_close to fz_drop_stream.
Rename fz_close_archive to fz_drop_archive.
Rename fz_close_output to fz_drop_output.
Rename fz_free_* to fz_drop_*.
Rename pdf_free_* to pdf_drop_*.
Rename xps_free_* to xps_drop_*.
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