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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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New routine to filter the content streams for pages, xobjects,
type3 charprocs, patterns etc. The filtered streams are guaranteed
to be properly matched with q/Q's, and to not have changed the top
level ctm. Additionally we remove (some) repeated settings of
colors etc. This filtering can be extended to be smarter later.
The idea of this is to both repair after editing, and to leave the
streams in a form that can be easily appended to.
This is preparatory to work on Bates numbering and Watermarking.
Currently the streams produced are uncompressed.
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We add various facilities here, intended to allow us to efficiently
minimise the memory we use for holding cached pdf objects.
Firstly, we add the ability to 'mark' all the currently loaded objects.
Next we add the ability to 'clear the xref' - to drop all the currently
loaded objects that have no other references except the ones held by the
xref table itself.
Finally, we add the ability to 'clear the xref to the last mark' - to
drop all the currently loaded objects that have been created since the
last 'mark' operation and have no other references except the ones held
by the xref table.
We expose this to the user by adding a new device hint 'FZ_NO_CACHE'.
If set on the device, then the PDF interpreter will pdf_mark_xref before
starting and pdf_clear_xref_to_mark afterwards. Thus no additional
objects will be retained in memory after a given page is run, unless
someone else picks them up and takes a reference to them as part of
the run.
We amend our simple example app to set this device hint when loading
pages as part of a search.
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Currently the only processing we can do of PDF pages is to run
them through an fz_device. We introduce new "pdf_process"
functionality here to enable us to do more things.
We define a pdf_processor structure with a set of function
pointers in, one per PDF operator, together with functions
for processing xobjects etc. The guts of pdf_run_page_contents
and pdf_run_annot operations are then extracted to give
pdf_process_page_contents and pdf_process_annot, and the
originals implemented in terms of these.
This commit contains just one instance of a pdf_processor, namely
the "run" processor, which contains the original code refactored.
The graphical state (and device pointer) is now part of private data
to the run operator set, rather than being in pdf_csi.
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