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Incorporates fixes from Michael.
Rather than specifically giving it rgb and cmyk values,
separations now include the colorspace. Conversions can
then be done into ANY colorspace we need.
Note, that we maintain the old way of working for the
gproof device.
Also, fix pdf_page_separations to correctly find all separations.
This involves recursively looking through colorspaces, forms
and shadings for colorspaces therein, making sure we don't run
into any circular references.
We do 2 passes, so that we can pick up as many colorants as Separations
as possible. On the second pass we pick up any colorants we missed in
terms of DeviceN spaces. The purpose of this is to try to ensure that
we get as many tint transforms as single input functions as we can.
This may not be important in the grand scheme of things, but seems
neater.
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If draw device is passed a pixmap with disabled separations, it
may have to push an extra group at the top to allow for the
actual rendering to properly happen in cmyk+spots, and then get
folded down at the end.
This pushing cannot happen at create time, due to it being
dependent on the defualt_cs settings. Accordingly, we push it
(just once) on the first drawing operation.
This means we need to be able to convert from "colorspace + set
of spots" to "different colorspace + different set of spots".
This in turn means we need to be able to drive lcms slightly
differently (to tell it whether to copy the spots unchanged
or not), so we have to amend the CMS interface code a bit for
that.
Currently we lack plotters to properly cope with plotting
images and shades with spots, so this will give a warning and
do nothing. To be filled in in future commits.
Ensure fz_get_icc_link accepts NULL to mean default color params.
Incorporates fixes from Michel Vrhel:
With transparency groups we can have RGB + spot pixmaps. When
drawing into those we need a mixture of colorant polarity. Ensure
that fz_convert_separation_colors takes account of this.
Fix C1 of Altona_Technical_1v1_x3.pdf (allow for output intent in
fz_clone_pixmap_area_with_different_seps).
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Update separations interface further to cope with whether spots
should be rendered separately, or as composite colors.
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Specifically this is aimed so we can efficiently get separation
details for PDF files (which may require a lengthy search process).
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Code MUST pass a non-null context to all functions.
Checking ctx for null and failing silently is no more useful
than segfaulting.
fz_keep_imp and fz_drop_imp handle NULL pointers safely, so
the NULL checks for this can also be dropped at the same time.
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Include code to free the list of separation names.
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Simple set of functions for managing sets of separations. Separations
have names, equivalent rgb/cmyk colors, and can be enabled/disabled.
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