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This moves dropping the converted pixmap into fz_convert_pixmap(),
which relieves every caller from doing so. Moreover resolution,
position and interpolation are kept.
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This function calls png_from_pixmap, an auxiliary function to do
the work. This was done deliberately to allow us to make the
optimisation of dropping the pixmap early if it is not required.
This keeps the memory use down in the case when a color conversion
is required.
Sadly, I never appear to have made the trivial change to actually
use it in this mode. Do that now.
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Keep to our naming conventions.
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We have various functions that, for different image formats,
write a header, then a band, then (sometimes) a trailer.
Push them all through a single interface.
This change also fixes potential problems caused by the trailer
writing being an implicit destructor, which can cause problems
in cleanup code if the trailer writing throws an error.
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Closing a device or writer may throw exceptions, but much of the
foreign language bindings (JNI and JS) depend on drop to never throw
an exception (exceptions in finalizers are bad).
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Allows us to remove the out parameter 'transform' from fz_begin_page.
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Previously the API assumed that all bands had to be the same
height. By moving the multiplication into the caller, we can
lift that assumption.
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