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% Copyright (C) 2001-2019 Artifex Software, Inc.
% All Rights Reserved.
%
% This software is provided AS-IS with no warranty, either express or
% implied.
%
% This software is distributed under license and may not be copied,
% modified or distributed except as expressly authorized under the terms
% of the license contained in the file LICENSE in this distribution.
%
% Refer to licensing information at http://www.artifex.com or contact
% Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
% CA 94945, U.S.A., +1(415)492-9861, for further information.
%

% basic colorspace mechanism

%
% There have been some major changes to the PostScript colour handling.
% In particular, the vast majority of the colour space code has been
% converted from PostScript to C. This file has been extensively
% modified, as has gs_icc.ps. The remaining PostScript files which
% previously implemented colour space handling; gs_ciecs2.ps, gs_ciecs3.ps
% gs_devcs.ps, gs_devn.ps, gs_devpxl.ps, gs_indxd.ps, gs_patrn.ps and
% gs_sepr.ps have been superceded by the C code and removed.
%
% gs_lev2.ps and gs_ll3.ps have also been modified so that they no longer
% attempt to execute these PostScript files.
%
.currentglobal //true .setglobal
systemdict begin

%
% gs_res.ps, and possibly other files, use this dictionary. Formerly
% in cspace_util, moved to systemdict.
%
20 dict dup /colorspacedict exch def

begin % colorspacedict

%
% gs_res.ps uses these entries in colorspacedict
% to populate the ColorSpaceFamily resource, so we need
% to add the supported spaces.
%
/DeviceGray [] def
/DeviceRGB [] def
/DeviceCMYK [] def
end % colorspacedict

%
% Global, read-only, unpacked, array-form device color spaces
% We need to return an array argument in response to currentcolorspace
% even if the argument presented to setcolorspace was a simple device
% space name. Not only that, but in order to satisfy some Adobe
% applications, it must be the *same* array every time. The only way
% to do that is to define an appropriate set initial arrays and always return
% one of those. These arrays are defined here.
%
/DeviceGray_array /DeviceGray 1 array astore readonly def
/DeviceRGB_array  /DeviceRGB  1 array astore readonly def
/DeviceCMYK_array /DeviceCMYK 1 array astore readonly def

%
% These routines used for the NOSUBSTDEVICECOLORS switch. This prevents
% substitution of DeviceGray, DeviceRGB and DeviceCMYK with a Default*
% colour space when /UseCIEColors is true. If the job includes a
% definition of /DefaltGray, DefaultRGB or DefaultCMYK then it also executes
% .includecolorspace to allow the device to record the substitute space.
%
/..page_default_spaces 3 dict def

%
% Used internally to retrieve any relevant default colour space.
%
% <Default space name> ..nosubstdevicetest false
%                                          <Default space name> [space] true
%
% If the boolean is true then the C code must set the additional colour space
% and execute .includecolorspace before finally setting a DeviceGray space.
%
% called from C code, can't undef. Use this to trigger the code:
% -sDEVICE=pkmraw -dMaxBitmap=4000m -r72 -dNOSUBSTDEVICECOLORS ./tests/Ghent_V3.0/110_defaultcolourspace_x3.pdf
/..nosubstdevicetest
{
  //false mark 3 -1 roll
  % If we have already recorded this space, don't repeat it.
  systemdict /..page_default_spaces get 1 index known {
    cleartomark
  } {
    {
      % Check to see if this space was defined by defineresource, if so then
      % the job defined it, otherwise its the usual default, so ignore it.
      dup /ColorSpace resourcestatus {
        pop 0 eq {
                  % Default* defined by defineresource
          systemdict /..page_default_spaces get 1 index //true put
                  dup /ColorSpace findresource 4 2 roll pop pop //true
        }{
          cleartomark
        } ifelse
      }{
        cleartomark
      } ifelse
    } stopped
    {cleartomark}if
  } ifelse
}bind def

end

%
% Set the initial device space
%
systemdict /DeviceGray_array get setcolorspace

.setglobal

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