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Previously the call to fz_convert_pixmap() threw causing a destination
pixmap leak. This illustrated a bigger issue with the error handling
so now all types of pixmaps are dropped and care is taken to also end
the knockout group, should there be any.
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Don't attempt to rely on alpha, as it is incompatible with the way
we clip through the mask at the end.
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Also do not do the extra group push if the destination pixmap
is in the proper color space and has all the required sep support.
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This way the MuPDF library itself only uses fz_snprintf for
consistent formatting.
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Michael has found a crash when scrolling quickly through pages
with gsview. 2 Threads are redrawing at the same time from a
display list. The problem comes when both threads happen to be
trying to draw the same tile from the cache at the same time.
The current code alters the ->{x,y} values of the pixmap from
the cache as it tiles. If 2 threads are using the same tile
at the same time, this causes a race condition which can upset
the clipping calculations and we can access out of range.
The solution is to make a new 'wrapper' fz_pixmap around the
same data, and to alter the x/y values there instead.
We therefore introduce a (hopefully generally useful) function
fz_new_pixmap_from_pixmap, and use that.
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If cmyk color spaces don't match, we should still honor overprint
just not overprint mode.
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It seems we need to treat group alpha differently for isolated and
non-isolated groups.
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For Ghent_V3.0/030_Gray_K_black_OP_x1a.pdf and
Ghent_V3.0/110_defaultcolourspace_x3.pdf.
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Testing tests/Ghent_V3.0/132_ICCbasedOverPrint.pdf shows that
we were incorrectly allowing performing the overprint magic
in the case where we were rendering to a CMYK pixmap in a
different CMYK space. This is not allowed.
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Fix Ghent_V3.0/070_OutputIntent_ISOCoated-v1_x3.pdf.
Partially Fix Ghent_V5.0/GWG190_DeviceN_Overprint_Black_X1a.pdf
Cope with 'All' and 'None' colorants. Files with 'All' and 'None'
colorants can still count as being "entirely CMYK" for the purposes
of color conversion.
There is a still an overprint problem with the 3rd swatch of
Ghent_V5.0/GWG190_DeviceN_Overprint_Black_X1a.pdf.
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Running Ghent_V5.0/GWG010_CMYK_OP_x3.pdf to PNG produces
'X' marks, where Acrobat does not. This is expected if
overprint similation is turned off, but not if it is
enabled.
The file does not define a colorspace for the initial page,
uses no transparency, and has no spots defined. Accordingly,
when we clone the page fz_separation object, we end up with
no object at all. The draw device therefore doesn't even
attempt to do overprint simulation.
We fix this by ensuring that we always have a non-NULL
separation object. Possibly we should make fz_page_separations
return a non-NULL, but empty object?
Even with this change, running to PNG still does not give the
required rendering. This is because PNGs use RGB, rather than
CMYK, and overprint is disabled for non-subtractive spaces.
We therefore adjust the code in push_group_for_separations
that decides whether it can avoid pushing an extra group.
If the basic pixmap is RGB, then we never skip the extra
group.
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The "blend back" at the end of the inner knockout groups was
attempting to reuse the existing blending code. This was going
wrong for all sorts of reasons (not least the uncomposition
phase) for knockout groups containing alpha, such as found on
page 7 of Altona_Technical_v20_x4.pdf.
Use a dedicated routine. This is much simpler as it doesn't have
to cope with blend modes etc.
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This is a first cut to get us to demo-ability. There will
likely be a few changes as we do a bit more testing with different
scenarios with Gray, RGB, CMYK combos of destination, proof and
output intent ICC profiles.
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When pushing a transparency group, MuPDF used to always create a shape
plane if there was one before. Ghostscript works differently, and
only creates a shape plane if we are in a non-isolated group.
This means that when blending an isolated group back to a non
isolated group, GS uses the "source alpha" in place of the "shape
alpha" to modify the non-isolated groups shape plane.
We update MuPDF to do the same here - it requires some new (small)
routines to do this new type of shape update, but means we carry
smaller amounts of data around overall.
Also, for what little remains of my sanities sake, this helps by
making it easier to compare the debug output from the 2 different
renderers.
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Knockout groups are only created temporarily, and this solves
problems in Altona_Technical_v20_x4.pdf on page 7 on the 'B'.
It seems reasonable that we shouldn't need to have isolated
enabled here, because it's really required for blending the
whole isolated group back.
While we don't propagate "isolated" into "inner" knockout groups, we
DO need to use the incoming isolated value to correctly establish the
backdrop to use.
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Fixes some issues in Altona test file.
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Fixes on issue on page 14 of altona test.
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If a colorant is not an explicit separation, then it will be
mapped down to process colorants. These cannot be protected
from overprint.
Incorporates a fix for a problem with shades seen on page 8 of.
Altona_Technical_v20_x4. This shows a problem where we were failing
to correctly overprint a grey gradient with a spot color one.
The overprint setup code was checking for 'Orange' being one of
the process colours, and not finding it. Consequently it was deciding
that Orange would have to be mapped to a process color, and so the
process colors could not be protected from overprint.
The code should have spotted that 'Orange' was one of the spot
colors. With this added, it works correctly.
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The proof conversion should only be done after we
have done all our drawing in the separations
group. Fixes issue in page 7 of Altona test.
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Introduce an fz_overprint bitmap (currently just a uint32_t,
but it'll grow to be an array of them if FZ_MAX_COLOR is
increased). Pointers to this are passed into all our
painting routines.
NULL means "Do what you've always done before, with no overprint".
non NULL, means that every set bit means "don't ever alter this
component".
We therefore set the overprint bitmap up according to the input
color/colorspace/colorparams before calling each routine.
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Special care is required when the DeviceN color space has
cyan, magenta, yellow or black.
For example, even if we support separations in the destination, if
the color space has CMY or K as one of its colorants and we are
drawing to an RGB or Gray pixmap we will want to do the tint transform.
Also if the pixmap has no seps memember present, we support the
separations if the destination is CMYK and the DeviceN colorspace
has no "Spot" (non-CMYK) colorants.
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This file has a type 3 font in it. It first uses
a 'd1' glyph, that uses a pattern. Accordingly, we
we render that pattern to a mask tile and store that
tile. Then it uses a 'd0' glyph, which uses the same
pattern. The cache is checked, and we erroneously pick
up the cached tile to reuse it - but this is not a
colored rendering, so we assert on plotting.
The fix is to ensure that the required colorspaces
match. This requires us to add the colorspace to the
tile key. Unfortunately, this means that colorspaces
have to become key_storable, so the patch is slightly
larger than would otherwise be the case.
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Sebastian points out that at various points we assign state
only to overwrite it without using it later on. Harmless, but
fixed here for neatness. Thanks.
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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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Option parsing is not implemented yet.
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Don't try to re-cache a tile we fetched from the cache.
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PNGs can't represent spots, or CMYK, so use PSD.
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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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They serve no good purpose except to require "fz_var"ing and
to get out of sync.
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Otherwise it confuses me every single time.
Also correct the output in fz_draw_clip_image_mask. We are rendering
onto .mask, not .dest, so that's the one we should debug.
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(Incorporates fixes from Tor, Michael and Robin).
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Also force softmasks to be isolated groups.
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We still use the fz_context versions as the default, but these
can be overridden with draw device options.
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This commit adds an interface for a color management engine
to MuPDF, together with the internal changes required to
use it. We also add an implementation of this interface using
the LCMS2 library.
This commit is the "lcms" development branch squashed to a single
commit. The individual commits that make it up are as follows:
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Add LCMS2 submodule.
Add required source files to MSVC libthirdparty project.
Plus changes to the Makefile.
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Change name of libfont to libresources
The library can hold things other than fonts including
ICC profiles and eventually halftone screens etc.
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Generate and include icc profiles on windows solution
Makefile for linux needs to be updated
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Initial cut at interface to little cms
Methods for getting profile handles, link handles
and transform buffers as well as individual colors.
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Install ICC profiles from source
When the source color space is an ICC profile
install the ICC space. Use alternative color
space if ICC is invalid.
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Rename ICC resources
The way that fontdump generates the names was
causing some redundant prefix/suffix combinations.
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Make resource ICC profiles usable
This brings in the resource profiles for use with the
target device. When mudraw is invoked with the icc
color type, it will set up the target pixmap to have an icc
based color space.
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Make Default ICC color spaces not storable
The ICC color spaces in the color context should not be
put into the store. ICC color spaces that are contained
in the source document are however storable.
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Add in support for single color conversion
This adds in the selection of the icc single color
converter. Note that we may want to look at using
the float conversion in lcms here since we are going
from and to float. The down side is that the creation
of such converters may be expensive.
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Pixmap ICC conversion
Also clean up and further simplify some of the code. Use common
dst, src in function parameters instead of src, dst.
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Add md5 calculation for profiles
Compare md5 of source and destination. If they
are the same set link as identity and do not bother
creating link from cmm.
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Initial attempt at adding links to store
Next need to make sure I have all the dropping set up
correctly and that the links are getting freed when
we are all done with them.
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Add drop for link
Make sure that we drop the links when we are done with them.
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Fix icc link store ref. counting + rendering intent
The key allocations, rc and removal was wrong for the icc links.
Also added in support on the graphic state for rendering intent.
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Add ICC profiles to Makefile.
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Move ICC profile loading to colorspace.c
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Fix build on linux.
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Use hexdump in creating icc profiles
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First cut at CalRGB CalGray handling
These color spaces are converted to equivalent ICC profiles
when the drawing operation occurs. ToDo still is avoid
creating brand new CalGray, CalRGB or ICC color spaces when
we encounter the same object in the source file. Instead
we should make use of the store.
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Adding fz_color_params into device API
Stroke and fill of paths and text which will have color rendering related settings
including overprint, overprint mode, rendering intent and black point settings.
Images have a fz_color_params member added to them.
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Rendering intent support for graphic and text
Graphic fills and strokes as well as text fill and strokes
handle the rendering intent settings. This works
through the display list. The parameters related to
color rendering, ri, bp, op, opm are packed in the flags
bits through the display list.
To do: Add support for images and shadings.
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Add support for rendering intent with images
Required change to fill_image api, hence the large
number of files touched.
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Add support for shadings rendering intent and DeviceN
This adds support for the rendering intent in shading fills.
Also, adds in support for color management of DeviceN and
Separation color spaces where the base space is defined to be
ICC.
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Add clamping proc to colorspace-imp.h
In the head of mupdf, the index color values were not
being clamped properly. I moved the clamping operation
to be performed by a procedure in of the color space.
The a*, b* values in LAB will need to include a range value
for proper clamping as well as the ICC color space at some
point.
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Fix assert test with index images
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Support for DeviceN images color managed
The base space for DeviceN and separation images
is now color managed when the ICC work flow is used.
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Add DefaultGray etc to names.txt
The DefaultGray, DefaultRGB, and DefaultCMYK settings
in the pdf page resource dictionary need to be parsed
and handled if present.
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Remove methods for setting color space in context
The methods that existed for setting the color spaces
in the color space context were broken and we will not
be changing them from their initial setting at startup.
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Add front end support for default color spaces
PDF can specify in the resource dictionary color spaces
that should be used for DeviceGray, DeviceRGB and DeviceCMYK.
This commit handles the extraction of these color spaces
and passes them through the display list and gets them
into a structure on a draw device (if one is used).
Next step is to have the draw device make use of them.
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Backend of default color spaces
This handles the use of page level definitions for
DefaultGray, DefaultRGB, DefaultCMYK in the
draw device. The interface for the pixmap color
conversion had to be expanded a bit to pass the
default_cs object. This was needed due to the fact
that the image could be DeviceN or Separation and
have a base space that needs to be replaced by
a page level Default color space. Tested this
with a file that had two pages each with an common
reference image object but different DefaultCMYK
definitions in the page resource dictionary. Proper
rendering was obtained.
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Add icc support to band-writer and png output
For image viewers that support icc profiles, it
is important that we include the icc profile
into those formats that support. Currently the
only output format we have that supports it is
PNG. But if we decide to do tiff, jpeg or psd
those also support the embedding of icc profiles.
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Work toward multithreading
Each cloned context creates a new cmm context to
reduce contention. This may not be optimal though
as it may create conflicts in any shared store.
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Add missing files.
Failed to check in icc-imp.h and icc34.h
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Fix default device color calls
copy and paste errors.
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Fixes
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Fix clamping of lab colors
The lab colors when used with the lab resource profile
need to be properly clamped and scaled.
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Turn off ICC create debug define
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Fix memory leak issues
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Set clamp proc in color context color spaces
When NO_ICC is enabled there was an issue as the
default spaces did not have the clamp proc (which was added
in the lcms branch).
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Fix several issues after rebase
During rebase of the branch there were several
issues that came up. In addition there was
a fix related to the use of the lcms2 context branch
that did not make it in for some reason.
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Fix for fz_store_type structure changes
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Fixes for multithreaded
This fixes a few issues. One issue is that we can not be changing the
input and output formatter for the links if they are being shared among
threads. This adds the format as part of the link definition. Next step
is to create a link clone operation in lcms so that we can readily create
a different one with everything the same except the formatter.
Also, this shares the profiles that exist in the color context among the
threads. When a context is cloned, it will use the profiles in the current
context but it will create a new cmm context.c
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Fix NO_ICC issues
There were a few issues that occurred when we compiled and ran
with the NO_ICC setting.
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Change CMM to use lower resolution tables in links
The table resolution greatly affects the performance for some files. I don't see any significant color rendering issues going with a lower resolution.
Selecting cmsFLAGS_LOWRESPRECALC uses a MLUT resolution of 17. This is going to be
sufficient color wise and gives a large improvement performance wise especially for files
where the color link creation is significant compared to the rendering.
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Fix link key creation to populate alpha and bit depth.
The store key for icc links needs to include the bit depth
and if the transform has to handle an alpha value. This
is needed due to the fact that we can't change the formatter when
we are sharing links among different threads.
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Pull in some MSVC 2005 fixes for lcms2
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Fix non-prototype prototype.
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Miscellaneous typos, whitespace fixes.
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Tidy colorspace creation API.
Rather than pass a magic implementation reference count value
(-1 for static, 1 for normal), pass a boolean "is_static" flag.
This gives a nicer API (IMAO etc).
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Make all colorspaces use an fz_buffer.
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Fix internal naming of MSVC project file.
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Fix some error handling.
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Add some consts.
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Tweak fz_color_params and fz_store_hash.
Use uint8_t for fz_color_param entries - no need to use
larger.
Same change in fz_store_hash. This limits the size required
for the hash table too.
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Throw on errors, rather than returning NULL.
fz_cmm_transform_pixmap should throw if it's fed pixmaps
incompatible with its transforms.
fz_cmm_new_ctx should throw if the cmm fails to initialise.
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Ensure LCMS2_OBJs are built/linked using Makefile.
Also ensure that ICC_OBJs are included.
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Fix some unused variable warnings.
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cs_params fixes.
Use the ones that are passed.
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fz_color_params tweaks.
Make them const in many places.
Cope with cs_params == NULL meaning default (i.e. fz_cs_param(ctx)).
Minimise the places we call fz_cs_params(ctx).
Consistently use cs_params rather than a mix of cs_param and cs_params.
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Improve PDF color params handling.
PDF allows different OP settings for strokes and fills.
This means that either we need to keep separate entries in
each fz_color_param structure for the stroke one or the fill
one, OR we need to duplicate the fz_color_param structure.
It seems neatest to do the latter (not least because this
means we don't pass more information to each device function
than it actually needs).
Accordingly, we put an fz_color_param in each pdf_material.
We update the code that reads ExtGStates to set the values
appropriately. We take the opportunity to add support for the
PDF 2.0 UseBlackPtComp option too.
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Fix colorspace ref count problems.
1) Don't drop colorspace until we've finished using it.
2) Don't drop it twice.
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Convert NULL deref into a thrown error.
Seen with:
mutool draw -D -o out.png ../tests_private/comparefiles/Bug689760.pdf
We seem to have a pdf-cal space with no profile.
Talk to Michael about this.
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Avoid using colorspace names to distinguish colorspaces.
Using strcmp is slow.
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Cope with failure to parse default colorspaces during PDF page load.
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Avoid SEGV due to to pdf_cal space with no profile.
As seen in:
tests_private/pdf/PDFIA1.7_SUBSET/CATX4879.pdf
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Handle cases where base space of sep is pdf-cal
We handled this for images, but not for solid fills.
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Accelerate ICC color conversion.
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Cope with indexed images in the color management.
Some images (JPX images) come to the cm code still in
the indexed color space. Their base space could be DevN
so we need to cope with multiple base decodes. This
continues the decode until we get to a space for which
we can create an ICC link.
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Ignore alpha presence in component count check
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Eliminate recursion in fz_source_colorspace_cm.
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Cope with bare ICCBased colorspace defs.
Bug692137.pdf has ICCBased colorspaced definitions given
directly as a stream, rather than as
[ /ICCBased <stream reference> ]
Acrobat copes with these, as does gs. We therefore update our
code to cope too.
Also, the PDF spec says that any problems found when reading
the Default spaces should be ignored (or at least not to abort
rendering). Update our code to do that too.
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Tweak color converter logic for speed.
When we are using an icc profile based conversion, avoid ever
having to lookup the color converter for each conversion call;
do it at the lookup stage.
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Harden us against failures during ICC link creation.
Seen with corrupted profiles.
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Fix for handling alpha with lcms.
Note that this currently maintains an alpha when it is present.
We may need to do some work for the gray scale conversion to alpha mask.
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Delay pdf-cal profile creation
Put the creation of the pdf cal profile into the link
creation function (rather than have it scattered). Also
be robust in the condition of failure to create the profile.
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Proper clamping with embedded CIELAB ICC profile
If the ICC profiles alternate color space is LAB
then use the LAB clamping proc.
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Use the color space clamp when converting to base color spaces
In many of the Ghent test files, we have a DeviceN image whose
alternate color space is CIELAB. We need to make sure to use
the CIELAB clamping operation in this case.
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Make ICC runtime configurable.
Add fz_icc_flowflow, fz_set_icc_workflow functions to read ICC
workflow state, and set the ICC workflow state. The latter will
throw an error if trying to enable ICC workflow in a NO_ICC build.
Add -N flag to mutool to disable ICC.
Incorporates build fixes from Michael.
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Ensure fz_draw_fill_image uses the pixmap colorspace
It appears that the image colorspace historically has been able
to differ from the pixmap colorspace. While we've fixed the cases
that we know about for this (see the previous commits), tweak
fz_draw_fill_image to work the way it always has in the past.
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Add support for output intent
PDF documents can have an ICC profile defined in their Catalog
which defines the output color space and the color space to
use for one of the Device color spaces (e.g. DeviceGray,
DeviceRGB or DeviceCMYK).
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Catch errors in default color spaces
Before setting the default color space contained in
the file, make sure it is the correct type.
Bug692213.pdf
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Clamp to base space during sep color conversion
This was the source of a problem when the base space
was CIELAB.
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Rename some functions to be more MuPDFy
drop rather than free etc.
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Fix "casting away const" warning.
srcv is a const *. Do the clamping operation on src_map
(the same value) before it is assigned into the const
variable.
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Rejig top level color management interface slightly.
Same code, just change the encapsulation.
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Remove pre-multiplied alpha prior to color management
The pixmaps in mupdf use a premultiplied alpha format.
Prior to doing any color management we need to undo
the alpha and then reapply after color management.
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Remove global output intent as unused.
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Move fz_color_params to be the final arg in dev calls.
Frequently this will be NULL, and it doesn't form part of
the colorspace/color/alpha triple.
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Rename fz_default_xxx static variables.
Remove fz prefix, to prepare for a later renaming that would conflict.
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Rename cs_params to color_params.
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Rename lcms branch identifiers.
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Return device colorspaces if the default colorspace is NULL.
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Clean up device call function for set_default_colorspaces.
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Add missing rethrow.
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Load page default colorspaces lazily.
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murun: Add color params device argument.
Stubbed to always be NULL at the moment.
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Rename extgstate processor ops.
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Fix a few minor issues from Tor
Removes icc-imp.h
Rename color-icccreate.c
Add context to some methods
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Fix javalib with recent lcms dev changes.
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Update lcms2 with sub project fixes.
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Fix build failure.
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Add icc profile into other PNG output methods
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Fix some ints that should be size_t's.
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Tweak fz_new_icc_data_from_icc_colorspace.
Ensure that the colorspace is const, and that we set size to 0
if we don't find any data.
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Combine band writer methods for header and ICC writing
For many formats (like PSD), we need to delay writing some of the
header until we know whether we are getting an ICC profile to
write or not. Makes more sense to just write them at the same
time.
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Miscellaneous tweaks in colorspace.c
Mainly to avoid pointer aliasing, "nicer" whitespace, and a leak
on error.
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Avoid rightward drift in get_base_icc.
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Ensure that pdf_load_output_intent copes with exceptions.
If load_icc_based throws and exception, warn and continue. Don't
not render a file just because the inbuilt default profiles
are broken.
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Revert change in pdf-page.c
The page resources load had been moved so we could get the default
colorspaces, but this has been moved into run_contents, so putting
stuff back as it was before.
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Revert changes in mudraw.
We had added some colorspages in mudraw, and then later removed them.
Revert the changes to accomodate this to make the overall branch diffs
smaller.
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Use fz_buffer in color-icc-create.c
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Force mapping through proof icc profile always.
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Fix behaviour on fz_cmm_new_profile failure.
If the profile fails to be made, return an error code,
and have the callers take sane steps.
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Tweak load_icc_based
Cope better with errors in reading the ICC space not stopping
us loading the alternate.
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Remove unused variable.
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Get page resource for DefaultCS look-up
res = pdf_dict_get(ctx, PDF_NAME_Resources, page->obj); was not
returning resource.
Replaced with res = pdf_page_resources(ctx, page);
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Move default color space set up to pdf_run_page_contents_with_usage
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Review fixes for lcms branch.
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Fixes for calibrated colorspace loading.
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Add fz_document_output_intent wrapper. Lazy load intent for PDF.
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Copy DefaultCS logic into pdf_run_annot_with_usage.
Same code as from pdf_run_page_contents_with_usage.
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More review fixes.
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Avoid rightward drift in pdf_load_cal_common
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Rename color_converter functions to be find/drop.
Better than than lookup/discard. lookup suggests something that
doesn't need dropping, and we use drop rather than discard by
convention.
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Move cmm from context into colorspace context.
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Review fixes: Remove recursion and rename functions.
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Don't access doc->oi directly in pdf_load_default_colorspaces.
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Rename fz_colorspace_is_pdf_cal to fz_colorspace_is_cal and make it public.
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Tweak function naming to be more consistent.
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fz_md5_icc can be implemented using fz_md5_buffer.
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Print full md5 checksums in link key debug prints.
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Make fz_md5_buffer NULL safe.
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Simplify debug saving of ICC profiles.
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Rename fz_cmm_new/drop_profile to init/fin.
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Indentation cleanups.
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Move CMM static inline functions from private header to C file.
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Tweak fz_icc_data_from_icc_colorspace to return a buffer.
Also, remove the _new_ from the name to reflect the fact that we
are passed a borrowed handle, not given a new reference.
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java: Add ColorParams.pack() function.
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Generate one C file for the embedded ICC profiles.
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Return const pointer from fz_default_color_params.
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Change misleading argument names to fz_new_colorspace.
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Rename fz_cmm_new/drop_link to fz_cmm_init/fin_link.
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Change definition of fz_cmm_instance.
Rather than void, use an undefined struct in keeping with the
rest of the code.
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Add support for color managed bgr color space
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Return unsigned char array from fz_lookup_icc.
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Make default_color_params immutable.
Changing the defaults used by the draw device should happen via a
device call, should we need the functionality in the future.
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Clean up error handling in color-lcms.c
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Fix signed/unsigned warning.
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