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Proper blending of spots is dependent upon the blending
color space as well as the blend mode. In particular
when the blend mode is non-separable or non-white preserving
normal blending should be used for the spot colorants.
Incorporates various fixes and optimisations squashed back
to this one commit for clarity. Some of these fixes/optimisations
are due to Michael Vrhel.
In particular we move to handling non-isolated groups in the same
way as gs.
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Incorporates fixes from Michael: When dealing with spot colors, if the
destination space is pure CMYK and we have unsupported spots we can
do a weighted addition of the spot CMYK colorant like Adobe does
in the PSD image format. If the destination space is RGB we need
to do a traditional color mapping of each pixel.
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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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The conditional is always == 255 here.
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Remove superfluous '%' character in the comment with binary bytes.
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fz_dump_gel() was removed in commit
9a725130b9b16daa332f8502e24eac9cab4cf9b2.
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Use fz_stext_char directly instead.
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fz_colorspace.name is an array, not a pointer, so will never be NULL.
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The logic for detecting and stripping alpha channels was subtly wrong.
Simplify it, and also make it cope with spot colors.
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Fix color PCL writing bugs introduced when making alpha channels
in pixmaps optional.
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Option parsing is not implemented yet.
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For non-rotated text, this vector will always be [1 0].
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* Use pool allocator and linked lists for all levels.
* Remove separate fz_stext_sheet struct.
* Remove unused 'script' style.
* Remove 'span' level items.
* Detect visual/logical RTL layouts.
* Detect indented paragraphs.
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