ref: 4526b1a5dd7f9ecb5b0b472cc4bd6a41b05effcc
dir: /sys/lib/ghostscript/gs_patrn.ps/
% Copyright (C) 2001, 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_patrn.ps,v 1.2 2002/11/13 20:23:10 alexcher Exp $
% Pattern color space method dictionary.
% verify that Pattern color spaces are supported
/.setpatternspace where
{ pop }
{ currentfile closefile }
ifelse
.currentglobal true .setglobal
.cspace_util begin
%
% <name1 | array1> get_pattern_base_cspace <null | name2 | array2>
%
% If the Pattern color space has a base color space, push that base
% color space onto the stack. Otherwise, push a null object.
%
/get_pattern_base_cspace
{
dup type /nametype eq
{ pop //null }
{
dup length 1 gt
{ 1 get }
{ pop //null }
ifelse
}
ifelse
}
bind def
%
% <dict> has_base_color <bool>
%
% Determine if a Pattern "color" includes a base color. This is the case
% if the pattern dictionary has PatternType 1 and PaintType 2.
%
/has_base_color
{
dup //null eq
{ pop //false }
{
dup /PatternType get 1 eq
{ /PaintType get 2 eq }
{ pop //false }
ifelse
}
ifelse
}
bind def
%
% <c1> ... <cn> <pattern_dict> <pattern_cspace>
% get_pattern_base_color
% <c1> ... <cn> <base_cspace> true
% or
% <?c1?> ... <?cn?> <dict> <pattern>
% get_pattern_base_color
% false
%
% If a pattern dictionary has a base color, set up that base color and
% color space, and push true. Otherwise, just push false. It is assumed
% that if the pattern includes a base color, the Pattern color space
% has a base color space.
%
/get_pattern_base_color
{
exch //has_base_color exec
{ 1 get //true }
{ pop //false }
ifelse
}
bind def
colorspacedict
/Pattern
mark
/cs_potential_indexed_base false
/cs_potential_pattern_base false
/cs_potential_alternate false
/cs_potential_icc_alternate false
%
% We employ the same convention for describing the number of
% components in a Pattern color space as is used by the graphic
% library. For pattern spaces with no underlying color space,
% the result is -1. If a Pattern space has an underlying color
% space with n components, the result is -(n + 1).
%
/cs_get_ncomps
{
//get_pattern_base_cspace exec dup //null eq
{ pop 0 }
//.cs_get_ncomps
ifelse
1 add neg
}
bind
% there is no "range" for a Pattern color space
/cs_get_range { {} cvlit } bind
/cs_get_default_color { pop //null } bind
/cs_get_currentgray
{
//get_pattern_base_color exec
//.cs_get_currentgray
{ 0 }
ifelse
}
bind
/cs_get_currentrgb
{
//get_pattern_base_color exec
//.cs_get_currentrgb
{ 0 0 0 }
ifelse
}
bind
/cs_get_currentcmyk
{
//get_pattern_base_color exec
//.cs_get_currentcmyk
{ 0 0 0 1.0 }
ifelse
}
bind
/cs_validate
{
dup //get_pattern_base_cspace exec dup //null eq
{ pop }
{
//.cs_validate exec //.cs_potential_pattern_base exec not
//setcspace_rangecheck
if
}
ifelse
}
bind
% substitute the base space if appropriate
/cs_substitute
{
dup //get_pattern_base_cspace exec dup //null eq
{ pop dup }
{
//.cs_substitute exec 2 copy eq
{ pop pop dup }
{
% retain only the new alternate space
exch pop
% build all new structures in local VM
.currentglobal 3 1 roll //false .setglobal
% construct a new array and insert the new base color space
1 index dup length array copy dup 1 4 -1 roll put
% restore VM mode
3 -1 roll .setglobal
}
ifelse
}
ifelse
}
bind
/cs_prepare {}
%
% Install the current color space.
%
% The current Ghostscript color space implementation requires that
% color spaces that provide a base or alternative color space set
% that base/alternative color space to be the current color space
% before attempting to set the original color space.
%
% In principle, the only errors that are possible for .setpatternspace
% (given that setcolorspace itself is legal) are limitcheck and/or
% VMerror. The Ghostscript implementation allows a few others, so
% we go through the full code to restore the current color space in
% the event of an error.
%
/cs_install
{
dup //get_pattern_base_cspace exec dup //null eq
{
pop
dup type /nametype eq
{ pop { /Pattern } cvlit }
if
.setpatternspace
}
{
% save the current color space
currentcolorspace
% set the base color space as the current color space
exch //forcesetcolorspace
% set the pattern color space; restore the earlier space on error
mark 2 index
{ .setpatternspace }
stopped
{ cleartomark setcolorspace stop }
{ pop pop pop }
ifelse
}
ifelse
}
bind
%
% Pattern dictionaries generated by makepattern will include an
% Implementation entry whose value is an internal data structure.
% Such structures are given executable type names that match their
% internal structure names. The names used for pattern
% implementations are gs_pattern1_instance_t and
% gs_pattern2_instance_t. It is unfortunate to have to expose such
% internal names at this level, but not easily avoided.
%
/cs_prepare_color
{
% verify that the topmost operand is a pattern dictionary
1 index dup type /dicttype ne
{
//null ne
//setcspace_typecheck
if
pop
}
{
dup /Implementation .knownget
{
type dup dup
/gs_pattern1_instance_t ne exch /gs_pattern2_instance_t ne and
exch xcheck not
or
//setcspace_typecheck
if
}
//setcspace_typecheck
ifelse
% check if base color space operands are present
dup /PatternType get 1 eq
{
/PaintType get 2 eq
{
% verify that a base color space exists
//get_pattern_base_cspace exec dup //null eq
//setcspace_rangecheck
if
exch 1 index //.cs_get_ncomps exec
exch 1 index 3 add 1 roll
//check_num_stack exec
//.cs_get_ncomps exec 1 add -1 roll
}
{ pop }
ifelse
}
{ pop pop }
ifelse
}
ifelse
}
bind
/cs_complete_setcolor //pop_1
.dicttomark
put
end % .cspace_util
.setglobal