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stm.avail_out is only set if !only_metadata.
Reverse the order of the if tests to silence valgrind.
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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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Currently, png_read_phys always rounds the resolution down. Many images
have a resolution just slightly shy of 96 DPI and are thus rendered too
large when they're resized from 95 to match the required 96 for output.
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This bug shows 2 problems with our data handling.
Firstly, if a zip file entry has less data in the stream than it
is declared to have, we would leave the end of the data uninitialised.
We now put out a warning, and blank it with zeros.
Secondly, if the PNG decompression fails to decode enough data, we
don't notice. Now we give a warning and blank the remaining pixels.
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