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+% Copyright (C) 1997, 2000 Aladdin Enterprises. All rights reserved.
+%
+% This program is free software; you can redistribute it and/or modify it
+% under the terms of the GNU General Public License as published by the
+% Free Software Foundation; either version 2 of the License, or (at your
+% option) any later version.
+%
+% This program is distributed in the hope that it will be useful, but
+% WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+% Public License for more details.
+%
+% You should have received a copy of the GNU General Public License along
+% with this program; if not, write to the Free Software Foundation, Inc.,
+% 59 Temple Place, Suite 330, Boston, MA, 02111-1307.
+
+% $Id: gs_dps.ps,v 1.4.6.1.2.1 2003/04/12 14:02:38 giles Exp $
+% Initialization file for Display PostScript functions.
+
+% ------ Contexts ------ %
+
+% To create a context with private local VM, we use the .localfork
+% operator to actually create the context, the new VM, and an empty
+% userdict, and then we call the .initlocaldicts procedure to make
+% local copies of the initial contents of the dictionaries in local VM.
+% savedlocaldicts in systemdict is a global read-only dictionary whose
+% elements are global read-only copies of these initial contents;
+% we just copy its elements into local VM and install them in systemdict.
+% userdict and internaldict require special handling.
+
+% Switching between contexts with different local VMs requires
+% changing the bindings in systemdict that reference local objects.
+% For this purpose, each userdict has an entry called localdicts
+% which holds the local copies of the elements of savedlocaldicts,
+% plus internaldict. The context switching code in the interpreter
+% effectively copies this dictionary into systemdict.
+% NOTE: the name localdicts is known to the interpreter.
+
+% Switching between contexts also requires resetting the user parameters.
+% The interpreter records the value of userparams (a local dictionary
+% referenced from systemdict) for each context, and uses it for this.
+% See gs_lev2.ps for more details.
+% NOTE: the name userparams is known to the interpreter.
+
+% Save copies of local dictionaries at the end of system initialization.
+% Also save the initial gstate.
+/.savelocalstate {
+ .currentglobal true .setglobal
+ //systemdict /savedlocaldicts mark //systemdict {
+ dup gcheck {
+ pop pop
+ } {
+ dup type /dicttype eq {
+ % Save a copy of this dictionary in global VM.
+ dup maxlength dict .copydict readonly
+ } {
+ pop pop
+ } ifelse
+ } ifelse
+ } forall .dicttomark readonly put
+ % Create localdicts for the current context.
+ false .setglobal
+ userdict /localdicts mark savedlocaldicts {
+ pop dup load
+ } forall /internaldict dup load
+ .dicttomark readonly put
+ % Save a copy of the initial gstate.
+ true .setglobal
+ //systemdict /savedinitialgstate gstate readonly put
+ .setglobal
+} .bind def
+
+% Initialize local dictionaries and gstate when creating a new context.
+% Note that until this completes, we are in the anomalous situation of
+% having systemdict point to dictionaries that are in a non-current
+% local VM. Because of this, we turn off garbage collection temporarily.
+/.copylocal { % <name> <dict> .copylocal <name> <dict'>
+ % Copy a dictionary to the current (local) VM,
+ % and make it read-only if its current definition is.
+ dup maxlength dict .copydict
+ 1 index load wcheck not { readonly } if
+} .bind def
+% When this is called, the dictionary stack is in its initial state,
+% and there is (anomalously) only one gstate on the gstate stack.
+/.initlocaldicts { % - .initlocaldicts -
+ -2 vmreclaim
+ .currentglobal //systemdict begin
+ false .setglobal
+ % Since localdicts doesn't exist yet, references from
+ % systemdict to local objects won't get restored if
+ % a context switch happens in this code. Therefore,
+ % until localdicts is defined, we have to keep all our
+ % state on the operand stack.
+
+ % Acquire userdict.
+ %****** WRONG IF NON-STANDARD INITIAL DSTACK ******
+ countdictstack array dictstack
+ { dup gcheck not { exit } if pop } forall
+ % Create localdicts with a local copy of each dictionary,
+ % except for userdict and userparams, which just need
+ % to be filled in.
+ mark savedlocaldicts {
+ 1 index /userdict eq {
+ % Stack: userdict mark ... /userdict inituserdict
+ counttomark 1 add index .copydict
+ } {
+ 1 index /userparams eq {
+ % Stack: userdict mark ... /userparams inituserparams
+ userparams .copydict
+ } {
+ .copylocal
+ } ifelse
+ } ifelse
+ } forall /internaldict dup .makeinternaldict .makeoperator
+ .dicttomark readonly /localdicts exch put
+ % localdicts is now defined in userdict.
+ % Copy the definitions into systemdict.
+ localdicts { .forcedef } forall
+ % Set the user parameters.
+ userparams readonly .setuserparams
+ % Establish the initial gstate(s).
+ /savedinitialgstate .systemvar setgstate gsave
+ % Wrap up.
+ end .setglobal
+} odef
+
+% Check whether an object is a procedure.
+/.proccheck { % <obj> .proccheck <bool>
+ dup xcheck
+ exch type dup /arraytype eq exch /packedarraytype eq or and
+} bind def
+
+% Create a context with private local VM.
+% The .localfork operator does all the work, but we must ensure that
+% .initlocaldicts gets called when the new context starts up.
+/localfork { % <mark> <obj1> ... <objN> <proc>
+ % <stdin|null> <stdout|null>
+ % localfork <context>
+ .currentglobal true .setglobal 3 index
+ dup .proccheck not {
+ pop .setglobal /localfork cvx /typecheck signalerror
+ } if
+ {exec .initlocaldicts} aload pop
+ 3 1 roll 3 packedarray cvx
+ 4 1 roll 5 -1 roll pop .setglobal .localfork
+} odef
+
+% Fork a context that shares VM. The .fork operator creates an empty
+% userparams dictionary for the context, but we still need to initialize
+% this dictionary when the new context starts up.
+/.postfork { % - .postfork -
+ % Initialize the user parameters.
+ savedlocaldicts /userparams get userparams .copydict readonly pop
+} odef
+/fork { % <mark> <obj1> ... <objN> <proc> fork <context>
+ .currentglobal false .setglobal 1 index
+ dup .proccheck not {
+ pop .setglobal /fork cvx /typecheck signalerror
+ } if
+ {exec .postfork} aload pop
+ 3 1 roll 3 packedarray cvx
+ 3 1 roll exch pop .setglobal .fork
+} odef
+
+% ------ Halftone phase ------ %
+
+/sethalftonephase { % <x> <y> sethalftonephase -
+ -1 2 index 2 index .setscreenphase pop pop
+} odef
+/currenthalftonephase { % - currenthalftonephase <x> <y>
+ 0 .currentscreenphase
+} odef
+
+% ------ Device-source images ------ */
+
+.imagetypes 2 /.image2 load put
+
+% ------ Device information ------ %
+
+/.deviceinfodict mark
+ /Colors null /GrayValues null /RedValues null /GreenValues null
+ /BlueValues null /ColorValues null
+.dicttomark readonly def
+/deviceinfo { % - deviceinfo <dict>
+ currentdevice //.deviceinfodict .getdeviceparams .dicttomark readonly
+} odef
+
+% The current implementation allocates a 2-element array each time.
+% Perhaps we should change this to 2 separate parameters for X and Y?
+/.wtdict mark
+ /wtranslation null
+.dicttomark readonly def
+/wtranslation { % - wtranslation <x> <y>
+ currentdevice //.wtdict .getdeviceparams exch pop exch pop aload pop
+} odef
+currentdict /.wtdict .undef
+
+% ------ View clipping ------ %
+
+/rectviewclip { % <x> <y> <width> <height> rectviewclip -
+ % <numarray|numstring> rectviewclip -
+ newpath .rectappend viewclip
+} odef