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fz_new_image_from_pixmap expects that the pixmap's colorspace has two
references which is contrary to expectations. If it instead addrefs the
pixmap's colorspace, the only caller pdf_load_jpx can consistently
drop the colorspace after passing it to fz_load_jpx.
Also, if the contract is that whatever is passed into
fz_new_image_from_pixmap belongs to the new image, then the pixmap also
has to be dropped on error so that it isn't leaked.
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Some warnings we'd like to enable for MuPDF and still be able to
compile it with warnings as errors using MSVC (2008 to 2013):
* C4115: 'timeval' : named type definition in parentheses
* C4204: nonstandard extension used : non-constant aggregate initializer
* C4295: 'hex' : array is too small to include a terminating null character
* C4389: '==' : signed/unsigned mismatch
* C4702: unreachable code
* C4706: assignment within conditional expression
Also, globally disable C4701 which is frequently caused by MSVC not
being able to correctly figure out fz_try/fz_catch code flow.
And don't define isnan for VS2013 and later where that's no longer needed.
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Remove code that's not used any more as a result of the previous
fix, plus some code that was unused anyway.
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Required for 1879_-_Indexed_colors_wrongly_converted.pdf
Also, removing broken code in the same place (where mat->v[] is
overwritten right after being set in the L*a*b* case).
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* If fz_alpha_from_gray throws in fz_render_t3_glyph, then glyph is leaked.
* If fz_new_image throws in pdf_load_image_imp, then colorspace and mask
are leaked.
* pdf_copy_pattern_gstate overwrites font and softmask without dropping
them first.
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For historical reasons lots of the code uses "xref" when talking about
a pdf document. Now pdf_xref is a separate type this has become
confusing, so replace 'xref' with 'doc' for clarity.
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