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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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NoExport (and ReadOnly) fields shouldn't mark the document for saving.
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Split functions out of pdf-form.c that shouldn't be there, and make
javascript initialization explicit.
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This feature is being implemented mostly for the purpose of permitting
the addition to a page of invisible signatures.
Also change pdf_create_annot to make freshly created annotations
printable by default.
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Some warnings we'd like to enable for MuPDF and still be able to
compile it with warnings as errors using MSVC (2008 to 2013):
* C4115: 'timeval' : named type definition in parentheses
* C4204: nonstandard extension used : non-constant aggregate initializer
* C4295: 'hex' : array is too small to include a terminating null character
* C4389: '==' : signed/unsigned mismatch
* C4702: unreachable code
* C4706: assignment within conditional expression
Also, globally disable C4701 which is frequently caused by MSVC not
being able to correctly figure out fz_try/fz_catch code flow.
And don't define isnan for VS2013 and later where that's no longer needed.
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If we have a NULL page, don't attempt to pass events to it.
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This initial commit doesn't entirely complete the task:
1) There are a couple of ucs<->winansi conversions left out,
2) The text displayed by the appearance string can slightly
overflow the annotation rectangle.
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pdf_js_setup_event strdups the field value, then nothing ever uses it
again.
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Correct the naming scheme for pdf_obj_xxx functions.
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Remove the fz_context field to avoid the structure growing.
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When incremental update is in place, functions that alter one structure may
have the side-effect of altering another: i.e., updating an annotation may
require the Annots array or even the page to be cloned. This commit makes
the existing annotation code hardy to this eventuallity. It also cleans up
a slight mess of the past where not all annotation-altering functions had
access to the pdf_annot struture, instead having to work with just the
pdf object.
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