harvey/sys/src/cmd/gs/lib/gs_icc.ps

%    Copyright (C) 2001 Aladdin Enterprises.  All rights reserved.
% 
% This file is part of AFPL Ghostscript.
% 
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% distributor accepts any responsibility for the consequences of using it, or
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% she says so in writing.  Refer to the Aladdin Free Public License (the
% "License") for full details.
% 
% Every copy of AFPL Ghostscript must include a copy of the License, normally
% in a plain ASCII text file named PUBLIC.  The License grants you the right
% to copy, modify and redistribute AFPL Ghostscript, but only under certain
% conditions described in the License.  Among other things, the License
% requires that the copyright notice and this notice be preserved on all
% copies.

% $Id: gs_icc.ps,v 1.2 2001/06/12 16:02:39 rayjj Exp $
% PostScript portion of ICCBased color space support

//userdict /.icc_comp_map_dict
  << 1 /DeviceGray  3 /DeviceRGB  4 /DeviceCMYK >>
put

colorspacedict /ICCBased
  {
    % Verify that the source object is an array, that it is at least of length
    % two, and that the second entry is a readable dictionary. If we got this
    % far, we know the top-level object exists and is readable, but it might
    % be a dictionary.
    dup type dup /arraytype ne exch /packedarraytype ne and
      { /setcolorspace /typecheck signalerror }
    if
    dup length 2 lt
      { /setcolorspace /rangecheck signalerror }
    if
    dup 1 get type /dicttype ne
      { /setcolorspace /typecheck signalerror }
    if
    dup 1 get rcheck not
      { /setcolorspace /invalidaccess signalerror }
    if

    % Verify that the dictionary defines the key N (number of components) and
    %  entry is provided and has a legitimate value
    dup 1 get /N .knownget
      {
        //.icc_comp_map_dict exch known not
          { 
            % generate the appropriate error
            /setcolorspace 
            1 index 1 get /N type type /integertype ne
              { /typecheck }
              { /rangecheck }
            ifelse
            signalerror
          }
        if
      }
      { /setcolorspace /undefined signalerror }
    ifelse

    % Verify DataSrouce and, if it is a string, convert it to a file
    dup 1 get /DataSource .knownget
      {
        dup rcheck not
          { pop /setcolorspace /invalidaccess signalerror }
        if
        type dup /stringtype eq
          {
            pop
            2 array copy
            dup 1
             2 copy get dup length dict copy
             dup /DataSource
              2 copy get /ReusableStreamDecode filter
             put
            put
          }
          {
            /filetype ne
              { /setcolorspace /typecheck signalerror }
            if
          }
        ifelse
      }
      { /setcolorspace /undefined signalerror }
    ifelse

    % set the alternate color space to be the current color space
    dup 1 get /Alternate .knownget not
      { dup 1 get /N get //.icc_comp_map_dict exch get }
    if
    setcolorspace

    % if CIE spaces are not use, just take the alternate space
    NOCIE
      { pop //null }
      { % check for native support
        /.seticcspace where
          { pop dup 1 get
	    % Acrobat Reader silently ignores errors with ICC profiles
	    % and uses the alternate color space -- do the same.
	    mark exch { .seticcspace } stopped
	      { cleartomark pop //null }
	      { pop }
	    ifelse
	  }
          { pop //null }
        ifelse
      }
    ifelse
  }
bind put

//userdict /.icc_comp_map_dict undef