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% $Id: gs_ll3.ps,v 1.6.2.1 2000/11/16 00:37:03 raph 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
% Do the right thing if NOBIND or DELAYBIND is in effect.
% Note also 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 load /.bind load ne
/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
{ /.bind /bind load def
/bind { } def
} if
currentdict /.bindscratch .undef
% ------ 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.
dup gsave { .buildshading .shfill } stopped grestore { stop } if
pop
} odef
% Establish an initial smoothness value that matches Adobe RIPs.
0.02 setsmoothness
% ------ UseCIEColor ------ %
% The library maintains and detects the UseCIEColor device parameter,
% but it doesn't have access to the resource dictionaries. We also
% want color space substitution to work in systems without a PostScript
% interpreter. Therefore, we eagerly inform the library of changes in
% the (effective) ColorSpace category that might affect the operation of
% UseCIEColor. We must notice the following events:
% 1) defineresource and undefineresource of the Default ColorSpaces.
% 2) restore.
% 3) Changes in current VM, which cause a different set of resources
% to become visible.
% #1 is rare. #2 is handled in C code. If checking the ColorSpace
% category on #3 turns out to be expensive, we can cache more information
% about whether these operations actually affect UseCIEColor.
% This operator implements color space substitution in the library:
% <index> <bool> .setsubstitutecolorspace -
% <bool> = true means substitute the current color space for the one given
% by <index>; <bool> = false means stop substituting. Substitution is not
% affected by grestore/setgstate, but it is affected by restore.
% ColorSpace defineresource and undefineresource for the Default keys
% call .definedefaultcs and .undefinedefaultcs. See gs_res.ps.
/.useciecolorkeydict mark
/UseCIEColor null
.dicttomark readonly def
/.definedefaultcs { % <index> <value> .definedefaultcs -
currentcolorspace
% Temporarily disable color substitution, in case the substitute
% color space is or mentions a color space that is currently
% being substituted.
currentdevice //.useciecolorkeydict .getdeviceparams exch pop exch pop
mark 5 -2 roll
% Stack: cspace UseCIEColor mark index value
{ setcolorspace true .setsubstitutecolorspace }
stopped counttomark 1 add 1 roll cleartomark
% Stack: cspace UseCIEColor stopped?
3 1 roll
currentdevice null true mark /UseCIEColor 6 -1 roll .putdeviceparams pop pop
setcolorspace { stop } if
} bind def
currentdict /.useciecolorkeydict undef
/.undefinedefaultcs { % <index> .undefinedefaultcs -
false .setsubstitutecolorspace
} bind def
/.setdefaultcs { % <index> <value|null> .setdefaultcs -
dup null eq { pop .undefinedefaultcs } { .definedefaultcs } ifelse
} bind def
/.getdefaultcs { % <key> .getdefaultcs <value|null>
.GetInstance { 0 get } { null } ifelse
} bind def
/.setglobal { % <bool> .setglobal -
dup .currentglobal ne {
% If there are no local definitions of the Default keys,
% changing VM can't affect the definition of any resource.
/.localcsdefaults .uservar {
% We only want to change substitutions for color spaces
% whose definitions are actually changing.
/ColorSpace /Category findresource begin
/DefaultGray .getdefaultcs
/DefaultRGB .getdefaultcs
/DefaultCMYK .getdefaultcs
end
3 index .setglobal
/ColorSpace /Category findresource begin
/DefaultGray .getdefaultcs
/DefaultRGB .getdefaultcs
/DefaultCMYK .getdefaultcs
end
% Stack: bool oldgray oldrgb oldcmyk
% newgray newrgb newcmyk
dup 4 index ne { 2 exch .setdefaultcs } { pop } ifelse
dup 4 index ne { 1 exch .setdefaultcs } { pop } ifelse
dup 4 index ne { 0 exch .setdefaultcs } { pop } ifelse
pop pop pop pop
} {
.setglobal
} ifelse
} {
.setglobal
} ifelse
} .bind odef % bind in .setglobal
% ------ DeviceN color space ------ %
% This isn't quite right, because the ColorSpaceFamily resource will exist
% even with languagelevel < 3, but it's close enough.
/.setdevicenspace where {
pop colorspacedict /DeviceN {
dup 2 get setcolorspace dup
dup 1 get length % # of components
.converttinttransform .setdevicenspace
} bind put
} if
% ------ Miscellaneous ------ %
% 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
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