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We want to turn pdf_page into a thin wrapper around a pdf_obj, so that
any updates to the underlying PDF objects will be reflected without
having to reload the pdf_page.
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Affects pdfclean, pdfmerge, and pdfposter.
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Remove unnecessary extra indirect object; pdf_add_object returns
an indirect reference already, so we don't need to duplicate it.
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Use comma-separated list of flags and key/value pairs, for
example: "linearize,resolution=72,colorspace=gray"
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The handling of not-decompressing images/fonts was geared towards
pdfclean usage; but now that we can create new PDF files, it makes
more sense to ask for images and fonts to be compressed, rather than
asking for them not to be decompressed with quirky interaction with
the 'expand' and 'deflate' flags.
If -f or -i are set, we will never decompress images, and we will
compress them if they are uncompressed.
If -d is set, we will first decompress all streams (module -f or -i).
If -z is set, we will then compress all uncompressed streams.
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This commit adds a page merging tool. The tool demonstrates the
use of object grafting. The object grafting function recursively
goes through the object to add all referenced objects. A map is
maintained to ensure that objects that have already been copied are
not copied again.
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