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If the scale is too large, the calculation to determine the
required size of a pixmap can overflow. This can lead to negative
width/heights being passed in, which confuses the subsampling
code, leading to SEGVs.
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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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See SumatraPDF's repo for a Windows-only implementation using WIC.
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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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This is required for e.g. 1980_-_compressed_inline_image.pdf and
Bug690300.pdf .
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fz_read used to return a negative value on errors. With the
introduction of fz_try/fz_catch, it throws an error instead and
always returns non-negative values. This removes the pointless
checks.
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This fixes among others 693274 - cmyk jpeg image.xps from bug 693274.
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We are testing this using a new -p flag to mupdf that sets a bitrate at
which data will appear to arrive progressively as time goes on. For
example:
mupdf -p 102400 pdf_reference17.pdf
Details of the scheme used here are presented in docs/progressive.txt
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Match our naming conventions.
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