Edit File: gs_cspace.ps
% Copyright (C) 2001-2018 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gs_ciecs2.ps, gs_ciecs3.ps % gs_devcs.ps, gs_devn.ps, gs_devpxl.ps, gs_indxd.ps, gs_patrn.ps and % gs_sepr.ps have been superceded by the C code and removed.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 % % - initgraphics - % % Although the internal routine gs_initgraphics resets the color space, % it does not reset the color space we store in the 'interpreter' % graphics state (so that we can hand it back in currentcolorspace). % So we need to do that in the PostScript world. % % /initgraphics { initgraphics systemdict /DeviceGray_array get setcolorspace } .bind odef % % 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. % /..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 % % <color_space_name> ..includecolorspace - % /..includecolorspace { % If we have already recorded this space, don't repeat it. systemdict /..page_default_spaces get 1 index known { pop } { mark exch { % 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 { % Job defined /Default*, so record it and allow the device access to it systemdict /..page_default_spaces get 1 index //true put gsave { dup /ColorSpace findresource //setcolorspace exec .includecolorspace } stopped pop grestore } if } if } stopped pop cleartomark } ifelse } bind def % % <color_space> <color_space_name> cs_substitute_generic <color_space1> <color_space2> % /cs_substitute_generic { .getuseciecolor {NOSUBSTDEVICECOLORS { //..includecolorspace exec dup } { /ColorSpace findresource } ifelse } { pop dup } ifelse } bind def % % <color_space> <color_space_name> cs_substitute_DeviceRGB_for_PDFX_or_PDFA <color_space1> <color_space2> % /cs_substitute_DeviceRGB_for_PDFX_or_PDFA { systemdict /PDFX .knownget not { //false } if systemdict /PDFA .knownget not { //false } {0 eq {//false}{//true} ifelse} ifelse or { dup /ColorSpace resourcestatus { pop pop } { (Error: Need a /DefaultRGB /ColorSpace resource for generating a PDF/X or PDF/A document.) = /cs_substitute_DeviceRGB_for_PDFX_or_PDFA cvx /undefined signalerror } ifelse /ColorSpace findresource } { //cs_substitute_generic exec } ifelse } bind def end % % Set the initial device space % systemdict /DeviceGray_array get setcolorspace .setglobal