ref: dde3628d54073e0569bf565e6ec861e42cfa35f6
dir: /sys/src/cmd/gs/lib/gs_ll3.ps/
% Copyright (C) 1997, 2000 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_ll3.ps,v 1.20 2003/10/22 11:22:29 alexcher Exp $
% Initialization file for PostScript LanguageLevel 3 functions.
% This file must be loaded after gs_lev2.ps and gs_res.ps.
% These definitions go into ll3dict or various ProcSets.
% NOTE: the interpreter creates ll3dict.
ll3dict begin
% We need LanguageLevel 2 or higher in order to have setuserparams and
% defineresource.
languagelevel dup 2 .max .setlanguagelevel
% ------ Idiom recognition ------ %
/IdiomRecognition false .definepsuserparam
% Modify `bind' to apply idiom recognition afterwards.
/.bindscratch 128 string def
% Note that since this definition of `bind' may get bound in,
% it has to function properly even at lower language levels,
% where IdiomRecognition may not be defined.
/.bind { % <proc> .bind <proc'>
//.bind currentuserparams /IdiomRecognition
.knownget not { false } if {
(*) {
/IdiomSet findresource
false exch {
% Stack: proc false dummykey [template substitute]
exch pop dup 1 get exch 0 get
% Stack: proc false substitute template
3 index .eqproc {
2 index gcheck 1 index gcheck not and {
pop
} {
3 -1 roll pop exch not exit
} ifelse
} {
pop
} ifelse
} forall { exit } if
} //.bindscratch /IdiomSet resourceforall
} if
} odef
currentdict /.bindscratch .undef
DELAYBIND NOBIND or not {
/bind /.bind load def
} if
% ------ HalftoneTypes 6, 10, 16 and HalftoneMode ------ %
% This code depends on an internal HalftoneType 7 with the following keys:
% Width, Height, Width2, Height2, TransferFunction:
% as for HalftoneType 16.
% Thresholds: a string or bytestring holding the thresholds,
% (Width x Height + Width2 x Height2) x BitsPerSample / 8 bytes,
% as for HalftoneType 16 except that the samples may be either
% 8 or 16 bits wide.
% BitsPerSample: 8 or 16.
% Note that this HalftoneType never appears in halftone dictionaries given
% to sethalftone, only as a component in those given to .sethalftone5,
% so its numeric value can be chosen ad lib as long as it differs from the
% other values that are legal in component dictionaries for .sethalftone5
% (currently only 1 and 3).
/.makehalftone7 { % <dict> <dict> <source> <Width> <Height>
% (<Width2> <Height2> | null) <BPS> .makehalftone7
% <setdict> <dict5> { .sethalftone5 }
8 dict begin
/HalftoneType 7 def
/BitsPerSample exch def
dup null eq {
pop 0
} {
/Height2 1 index def /Width2 2 index def mul
} ifelse 3 1 roll
/Height 1 index def
/Width 2 index def
mul add BitsPerSample 8 idiv mul .bigstring
% Stack: dict dict source str
dup type /stringtype eq { readstring } { .readbytestring } ifelse
not { /sethalftone load /rangecheck signalerror exit } if
readonly /Thresholds exch def
/TransferFunction .knownget { /TransferFunction exch def } if
% If the original Thresholds was a file, replace it with
% a new one.
dup /Thresholds get type /filetype eq {
dup /Thresholds [ Thresholds ] cvx 0 () .subfiledecode put
} if
mark /HalftoneType 5 /Default currentdict end .dicttomark
{ .sethalftone5 }
} bind def
/.bigstring { % <size> .bigstring <string|bytestring>
dup 65400 gt { .bytestring } { string } ifelse
} bind def
/.readbytestring { % <source> <bytestring> .readbytestring
% <bytestring> <filled>
% Note that since bytestrings don't implement getinterval,
% if filled is false, there is no way to tell how much
% was read.
true exch 0 1 2 index length 1 sub {
% Stack: source true str index
3 index read not { pop exch not exch exit } if
3 copy put pop pop
} for 3 -1 roll pop exch
} bind def
/.sethalftone6 { % <dict> <dict> .sethalftone6 <setdict> <dict5>
% { .sethalftone5 }
% Keys: Width, Height, Thresholds, T'Function
dup /Thresholds get
1 index /Width get 2 index /Height get
null 8 .makehalftone7
} bind def
/.sethalftone10 { % <dict> <dict> .sethalftone10 <setdict> <dict5>
% { .sethalftone5 }
% Keys: Xsquare, Ysquare, Thresholds, T'Function
% Note that this is the only one of these three HalftoneTypes
% that allows either a file or a string for Thresholds.
dup /Thresholds get dup type /stringtype eq { 0 () .subfiledecode } if
1 index /Xsquare get dup 3 index /Ysquare get dup
8 .makehalftone7
} bind def
/.sethalftone16 { % <dict> <dict> .sethalftone16 <setdict> <dict5>
% { .sethalftone5 }
% Keys: Width, Height, Width2, Height2,
% Thresholds, T'Function
dup /Thresholds get
1 index /Width get 2 index /Height get
3 index /Width2 .knownget { % 2-rectangle case
4 index /Height2 get
} { % 1-rectangle case
null
} ifelse 16 .makehalftone7
} bind def
.halftonetypes begin
6 /.sethalftone6 load def
10 /.sethalftone10 load def
16 /.sethalftone16 load def
end
% Redefine the halftone-setting operators to honor HalftoneMode.
/setcolorscreen {
/HalftoneMode getuserparam 0 eq {
//setcolorscreen
} {
12 { pop } repeat .getdefaulthalftone
{ //sethalftone }
{ .setdefaulthalftone }
ifelse
} ifelse
} odef
/setscreen {
/HalftoneMode getuserparam 0 eq {
//setscreen
} {
pop pop pop .getdefaulthalftone
{ //sethalftone }
{ .setdefaulthalftone }
ifelse
} ifelse
} odef
/sethalftone {
/HalftoneMode getuserparam 0 eq {
//sethalftone
} {
pop .getdefaulthalftone
{ //sethalftone }
{ .setdefaulthalftone }
ifelse
} ifelse
} odef
% ------ ImageTypes 3 and 4 (masked images) ------ %
.imagetypes
dup 3 /.image3 load put
dup 4 /.image4 load put
% We also detect ImageType 103 here: it isn't worth making a separate file
% just for this.
/.image3x where { pop dup 103 /.image3x load put } if
pop
% ------ Functions ------ %
% Define the FunctionType resource category.
/Generic /Category findresource dup maxlength 3 add dict .copydict begin
/InstanceType /integertype def
/FunctionType currentdict end /Category defineresource pop
{0 2 3} { dup /FunctionType defineresource pop } forall
% ------ Smooth shading ------ %
% Define the ShadingType resource category.
/Generic /Category findresource dup maxlength 3 add dict .copydict begin
/InstanceType /integertype def
/ShadingType currentdict end /Category defineresource pop
systemdict /.shadingtypes mark % not ll3dict
1 /.buildshading1 load
2 /.buildshading2 load
3 /.buildshading3 load
4 /.buildshading4 load
5 /.buildshading5 load
6 /.buildshading6 load
7 /.buildshading7 load
.dicttomark put
systemdict /.reuseparamdict mark
/Intent 2
/AsyncRead false
/CloseSource true
.dicttomark readonly put
/.buildshading { % <shadingdict> .buildshading <shading>
% Unfortunately, we always need to make the DataSource reusable,
% because if clipping is involved, even shfill may need to read
% the source data multiple times. If it weren't for this,
% we would only need to create a reusable stream if the ultimate
% source of the data is a procedure (since the library can't
% suspend shading to do a procedure callout).
dup /DataSource .knownget {
dup type /filetype eq {
//.reuseparamdict /ReusableStreamDecode filter
.currentglobal 1 index gcheck .setglobal
% Stack: shdict rsdfile saveglobal
2 index dup length dict copy exch .setglobal
dup /DataSource 4 -1 roll put exch pop
} {
pop
} ifelse
} if
% The .buildshading operators use the current color space
% for ColorSpace.
dup /ShadingType get //.shadingtypes exch get
1 index /ColorSpace get setcolorspace exec
} bind def
systemdict /.reuseparamdict undef
/.buildpattern2 { % <template> <matrix> .buildpattern2
% <template> <pattern>
% We want to build the pattern without doing gsave/grestore,
% since we want it to load the CIE caches.
1 index /Shading get
mark currentcolor currentcolorspace
counttomark 4 add -3 roll mark 4 1 roll
% Stack: -mark- ..color.. cspace -mark- template matrix shadingdict
{ .buildshading } stopped {
cleartomark setcolorspace setcolor pop stop
} if
.buildshadingpattern
3 -1 roll pop counttomark 1 add 2 roll setcolorspace setcolor pop
} bind def
.patterntypes
2 /.buildpattern2 load put
/shfill { % <shadingdict> shfill -
% Currently, .shfill requires that the color space
% in the pattern be the current color space.
% Disable overprintmode for shfill
dup gsave
0 .setoverprintmode { .buildshading .shfill } stopped
grestore { stop } if
pop
} odef
% Establish an initial smoothness value that matches Adobe RIPs.
0.02 setsmoothness
% ------ DeviceN color space ------ %
%% Replace 1 (gs_ciecs3.ps)
(gs_ciecs3.ps) runlibfile
%% Replace 1 (gs_devn.ps)
(gs_devn.ps) runlibfile
% ------ Miscellaneous ------ %
% Make the setoverprintmode and currentoverprintmode operators visible (3015)
% Because of the requirements of PDF, the .currentoverprintmode and
% .setoverprintmode operators have integer parameters. Thus wee need to
% convert the Postscript bool parameters to integers.
%
/setoverprintmode % bool setoverprint -
{
{ 1 } { 0 } ifelse % convert bool to integer
//.setoverprintmode
} odef
/currentoverprintmode % - currentoverprintmode bool
{
//.currentoverprintmode
0 ne % convert integers to bool
} odef
% Define additional user and system parameters.
/HalftoneMode 0 .definepsuserparam
/MaxSuperScreen 1016 .definepsuserparam
pssystemparams begin % read-only, so use .forcedef
/MaxDisplayAndSourceList 160000 .forcedef
end
% Define the IdiomSet resource category.
{ /IdiomSet } {
/Generic /Category findresource dup maxlength 3 add dict .copydict begin
/InstanceType /dicttype def
currentdict end /Category defineresource pop
} forall
/languagelevel 3 def
% When running in LanguageLevel 3 mode, this interpreter is supposed to be
% compatible with Adobe version 3010.
/version (3010) readonly def
.setlanguagelevel
end % ll3dict