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This silences the many warnings we get when building for x64
in windows.
This does not address any of the warnings we get in thirdparty
libraries - in particular harfbuzz. These look (at a quick
glance) harmless though.
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fz_pixmaps now have an explicit stride value. By default no change
from before, but code all copes with extra gaps at the end of the
line.
The alpha data in fz_pixmaps is no longer compulsory.
mudraw: use rgb not rgba (ppmraw), cmyk not cmyka (pkmraw).
Update halftone code to not expect alpha plane.
Update PNG writing to cope with alpha less input.
Also hide repeated params within the png output context.
ARM code needs updating.
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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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