ref: 290c921d1d01119b7d4550770da06c491508508f
dir: /sys/src/cmd/gs/lib/gs_devcs.ps/
% Copyright (C) 2002 Aladdin Enterprises. 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.
%
% For more information about licensing, please refer to
% http://www.ghostscript.com/licensing/. For information on
% commercial licensing, go to http://www.artifex.com/licensing/ or
% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
% San Rafael, CA 94903, U.S.A., +1(415)492-9861.
% $Id: gs_devcs.ps,v 1.7 2005/09/12 11:34:50 leonardo Exp $
% Device-specific color space method dictionaries.
%
% This file implements the method dictionaries for the Device-specific
% color spaces. See gs_cspace.ps for information.
%
% Note that, because these color spaces are parameter-less, no color
% space validation is required: if we can get to the color space methods,
% we know the color space is legitimate.
%
% The colorspace substitution routines for these color spaces
% (cs_substitute) will fail in a Level 1 system, but this is not a
% problem as .getuseciecolor will always return false for such systems.
%
.currentglobal true .setglobal
.cspace_util begin
%
% <r> <g> <b> rgb_2_gray <gray>
%
% Convert RGB colors to gray. This includes a special check for
% r == g == b, and avoids roundoff error if this is the case.
%
/rgb_2_gray
{
3 copy 1 index eq 3 1 roll eq and
{ pop pop }
{ .11 mul exch .59 mul add exch .3 mul add }
ifelse
}
bind def
systemdict /..page_default_spaces 3 dict put
% <color_space_name> ..includecolorspace -
/..includecolorspace
{ % Only includes ones explicitly defined by the document.
systemdict /..page_default_spaces get 1 index known {
pop
} {
mark exch
{ dup /ColorSpace resourcestatus {
pop 0 eq {
systemdict /..page_default_spaces get 1 index //true put
gsave
{ dup /ColorSpace findresource //_setcolorspace_nosub 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 <color_space1> <color_space2>
/cs_substitute_DeviceRGB_for_PDFX
{ systemdict /PDFX .knownget not { false } if {
dup /ColorSpace resourcestatus {
pop pop
} {
(Error: Need a /DefaultRGB /ColorSpace resource for generating a PDF/X document.) =
/cs_substitute_DeviceRGB_for_PDFX /undefined signalerror
} ifelse
/ColorSpace findresource
} {
//cs_substitute_generic exec
} ifelse
} bind def
colorspacedict
dup
/DeviceGray
mark
/cs_potential_indexed_base true
/cs_potential_pattern_base true
/cs_potential_alternate true
/cs_potential_icc_alternate true
/cs_get_ncomps //ncomps_1
/cs_get_range //get_range_1
/cs_get_default_color { pop 0 } bind
/cs_get_currentgray //pop_1
/cs_get_currentrgb { pop dup dup } bind
/cs_get_currentcmyk { pop 1 exch sub 0 0 0 4 -1 roll } bind
/cs_validate {}
/cs_substitute
{ /DefaultGray //cs_substitute_generic exec
}
bind
/cs_prepare {}
/cs_install { pop 0 .setdevcspace } bind
/cs_prepare_color //validate_1
/cs_complete_setcolor //pop_1
.dicttomark
put
/DeviceRGB
mark
/cs_potential_indexed_base true
/cs_potential_pattern_base true
/cs_potential_alternate true
/cs_potential_icc_alternate true
/cs_get_ncomps //ncomps_3
/cs_get_range //get_range_3
/cs_get_default_color { pop 0 0 0 } bind
/cs_get_currentgray { pop //rgb_2_gray exec } bind
/cs_get_currentrgb //pop_1
% to convert to cmyk use blackgeneration and undercolorremoval
/cs_get_currentcmyk
{
pop
% convert to subtractive (CMY) color space
3
{ 1 exch sub 3 1 roll }
repeat
% find the minimum (initial k component)
3 copy
2
{
2 copy gt
{ exch }
if
pop
}
repeat
% apply undercolorremoval
dup 5 1 roll currentundercolorremoval exec 4 1 roll
3
{ 3 index sub //bound_0_1 exec 3 1 roll }
repeat
% apply blackgeneration
5 3 roll pop currentblackgeneration exec //bound_0_1 exec
}
bind
/cs_validate {}
/cs_substitute
{ /DefaultRGB //cs_substitute_DeviceRGB_for_PDFX exec
}
bind
/cs_prepare {}
/cs_install { pop 1 .setdevcspace } bind
/cs_prepare_color //validate_3
/cs_complete_setcolor //pop_1
.dicttomark
put
end % .cspace_util
.setglobal
% Only create the DeviceCMYK color space if setcolorscreen is present
/setcolorscreen where
{ pop }
{ currentfile closefile }
ifelse
.currentglobal true .setglobal
.cspace_util begin
colorspacedict
/DeviceCMYK
mark
/cs_potential_indexed_base true
/cs_potential_pattern_base true
/cs_potential_alternate true
/cs_potential_icc_alternate true
/cs_get_ncomps //ncomps_4
/cs_get_range //get_range_4
/cs_get_default_color { pop 0 0 0 1 } bind
/cs_get_currentgray
{ pop 4 1 roll //rgb_2_gray exec add 1 exch sub //bound_0_1 exec }
bind
/cs_get_currentrgb
{
pop
4 1 roll 3
{ 3 index add 1 exch sub //bound_0_1 exec 3 1 roll }
repeat
4 -1 roll pop
}
bind
/cs_get_currentcmyk //pop_1
/cs_validate {}
/cs_substitute
{ /DefaultCMYK //cs_substitute_generic exec
}
bind
/cs_prepare {}
/cs_install { pop 2 .setdevcspace } bind
/cs_prepare_color //validate_4
/cs_complete_setcolor //pop_1
.dicttomark
put
currentdict /..includecolorspace .undef
currentdict /cs_substitute_generic .undef
end % .cspace_util
.setglobal