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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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When you use mutool clean to subset pages out of a PDF, we already
remove the Name tree entries for named locations that aren't in the
target file. We have henceforth failed to remove references to these
removed names though. This can cause errors (really warnings) on
reading the file back.
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Firstly, we remove the use of global variables; this is done by
introducing a 'globals' structure for each of these files and
passing it internally between functions.
Next, split the core of pdfclean_main into pdfclean_clean, and the
core of pdfinfo_main into pdfinfo_info.
The _main functions now do the argv processing. The new functions now
run entirely thread safely, so can be called from library functions.
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No more caching a flattened page tree in doc->page_objs/refs.
No more flattening of page resources, rotation and boxes.
Smart page number lookup by following Parent links.
Naive implementation of insert and delet page that doesn't rebalance the trees.
Requires existing page tree to hook into, cannot be used to create a page tree
from scratch.
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Remove the fz_context field to avoid the structure growing.
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