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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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The SVG device needs rebinding as it holds a file. The PDF device needs
to rebind the underlying pdf document.
All documents need to rebind their underlying streams.
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While looking at fts_09_0921, I spotted that the alpha values on images
and fills aren't being sent. Fix that here, together with broken colors
being sent for masks.
fts_09_0921 still renders badly due to the lack of support for blend
modes.
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The luminosity flag and background color are currently ignored.
The clip stack optionally held in the null device is updated here to
be a container stack, together with a flags word (currently just used
to indicate the type of the container at the current place in the
stack), and a user value (used by the SVG device to stash the id for
the mask it's generating).
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Really just a structure indicator as SVG 1.1 doesn't support
blending etc.
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fts_09_0919.pdf shows up some silly mistakes in the clip stack handling
and in the handling of 0 sized pixmaps. Simple fixes.
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A gradient fill that doesn't fill the bbox should be see through
(unless background color is set, but we'll worry about that case
when I find an example file that uses it). Arrange for the pixmap
we draw the gradient fill into to be transparent initially.
Also ensure that when we convert to png we preserve transparency.
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This accompanies the function formerly known as fz_image_as_png (now
renamed to fz_new_png_from_image).
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In particular, cope with the cases where xstep/ystep are not the same
as the tile width/heights.
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Thanks to Tor for finding the correct definitions for me.
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Images were missing a space, hence giving errors.
SVG text gets confused by leading (and repeated) whitespace, so elide it.
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