/usr/share/ghostscript/9.10/Resource/Init/gs_img.ps is in libgs9-common 9.10~dfsg-0ubuntu10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 | % (C) 2002 Artifex, Inc. 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.
% image, colorimage, and imagemask implementation
%
% The design of the overprint facility in Ghostscript requires that color
% specifications include the color space from which they were expressed,
% even after conversion to the device color model. Directly including this
% information in color specifications is usually not efficient, and is
% difficult to integrate into the existing code structure. The alternative
% approach taken is to extend a state mechanism through the device
% interface, and make the current color space, or more specifically,
% certain information about the current color space, a property of this
% state.
%
% For such a mechanism to work, it is necessary to identify all changes
% to the current color space. This is accomplished in the graphic library
% by funneling all changes to the current color space through the
% gs_setcolorspace procedure. At the PostScript interpreter level, this
% result is achieved by forcing color space changes through the
% setcolorspace operator.
%
% Aside from explicit use of setcolorspace, PostScript provides a few
% implicit methods of changing the current color space. The setgray,
% setrgbcolor, and setcmykcolor operators implicitly set the color space
% while explicitly setting the current color. Similarly, the colorimage
% operator and the traditional form of the image operator (5 operands)
% both temporarily modify the current color space while an image is
% being processed. The current file is concerned with the implementation
% of these two operators. In addition, the traditional form of the
% imagemask operator (5 operands), while it does not affect the current
% color space, is closely related to the image operator and thus is
% implemented in this file as well.
%
% In this implementation, all sampled objects are passed through one of
% the internal operators .image1, .imagemask1, .image1alpha, .image2,
% .image3, or .image4, each of which handles a specific ImageType value.
%
% The procedures in this file are responsible for constructing
% image dictionaries from a set of stack entries. This is, in principle,
% a trivial exercise. In practice it appears to be far more complex,
% primarily due to the need to reconstruct the original state in the
% event of an error. This is a particular problem for operators such as
% image, which include data source objects that may, directly or
% indirectly, be procedures. When these procedures are executed, the
% image operator's operands must have been cleared from the operand
% stack. Hence, the operand stack cannot be used to store state
% information. Similarly, the dictionary stack also cannot be used to
% store state information, as the data source procedures may depend on
% a particular dictionary being on the top of this stack.
%
% Adobe's PostScript implementations determine the extent to which the
% interpreter state is restored in the event of an error by the point at
% which the error is detected. Errors in the image/colorimage/imagemask
% operators that are detected before the data source procedures are
% executed restore the state in effect before the image was processed.
% Those that are detected as part of running the data source procedures
% only attempt to restore the state to that in effect at the start of
% the operator that failed (or at the conclusion of the data source
% procedure, if this procedure failed to push a string).
%
% The implementation given here follows the Adobe convention. The
% mechanism used is as follows:
%
% 1. Check that the stack has a sufficient number of operands, and
% that enough of them have the proper type to allow construction
% of the image dictionary. Any errors at this point are handled
% in the conventional manner.
%
% 2. Build the image dictionary, in the process clearing the image/
% colorimage/imagemask operands from the stack. No errors can
% occur during this process.
%
% (Special precautions could be taken during this step to handle
% a limitcheck or VMError during the building of the image
% dictionary, but this essentially never occurs in practice and, if
% it did, is very unlikely to leave a useable state. Hence, we don't
% bother with this possibility.)
%
% 3. The .image operator is executed in a stopped context. If it
% returns abnormally, a check is made to see if the uppermost
% operand on the stack is a color image dictionary. If so, the
% original stack is created anew using this dictionary. (Because
% the image operand works via colorimage, some additional special
% handling is required in this case.)
%
%
% Create a dictionary of operators for specific image and image mask types.
% Each of these will always handle ImageType 1. Additional types are added
% as they are supported in specific interpreter levels or versions.
%
% These dictionaries are in systemdict for historical reasons.
%
.currentglobal //true .setglobal
systemdict begin
/.imagetypes
5 dict
dup 1 /.image1 load put
def
/.imagemasktypes
5 dict
dup 1 /.imagemask1 load put
def
end
.setglobal
%
% Build a dictionary of utility procedures and constants for use in
% impelementing the image operators. This dictionary is in global VM but
% is maintained (during initialization) in userdict. It should be pushed
% onto the dictionary stack when constructing image-related procedures
% and pseudo-operators.
%
% This dictionary is removed from userdict when initialization is
% completed.
%
.currentglobal //true .setglobal
userdict /img_utils_dict 30 dict put
img_utils_dict begin
%
% Some useful local data structures:
%
% img_csary maps the number of components in an image to the implied
% color space.
%
% img_decary is a prototype Decode array; subintervals of this array
% may be used for fewer than 4 color components.
%
% img_params_ary is a list of the parameters to be built in the image
% dictionary for a colorimage invocation. ImageType is given a
% fixed value; the other parameters are in stack order (IMG_NComps
% is the number of components).
%
% img_mask_params_ary is the equivalent of img_params_ary for imagemask
% invocations. Polarity is a proxy for Decode, and is replaced
% by the Decode key in the image dictionary.
%
% img_mask_check_ary is the set of parameters that must be present in
% an image dictionary generated by an imagemask invocation. This
% differs from img_mask_params_ary in that Decode replaces Polarity.
%
/img_csary [ //null /DeviceGray //null /DeviceRGB /DeviceCMYK ] def
/img_decary [ 0 1 0 1 0 1 0 1 ] def
/img_params_ary
[
/ImageType /IMG_NComps /MultipleDataSources /DataSource
/ImageMatrix /BitsPerComponent /Height /Width /Decode
]
def
/img_check_ary //img_params_ary def
/img_unbuild_ary
//img_params_ary 1 1 index length 2 sub getinterval
def
/img_mask_params_ary
[ /ImageType /DataSource /ImageMatrix /Polarity /Height /Width ]
def
/img_mask_check_ary
[
/ImageType /BitsPerComponent
/DataSource /ImageMatrix /Decode /Height /Width
]
def
/img_mask_unbuild_ary
//img_mask_check_ary 2 1 index length 2 sub getinterval
def
%
% <?any?> <array> img_check_keys <?any?> <bool>
%
% Verify that:
% that there are at least two entries on the stack, and
% the second (lower) entry is a dictionary, and
% that dictionary contains all of the keys in the array
%
% If any one of these conditions does not hold, pop the array and push
% false; otherwise pop the array and push true. This utility is used by
% the colorimage and imagematrix procedures to determine if .image left
% the image dictionary on the stack after an abnormal return.
%
/img_check_keys
{
count 2 ge
{
1 index type /dicttype eq
{
//true exch
{
2 index exch known and
dup not
{ exit }
if
}
forall
}
{ pop //false }
ifelse
}
{ pop //false }
ifelse
}
.bind def
%
% Procedures to convert a set of stack entries to a dictionary. There is
% a procedure associated with each key, though most keys use the same
% procedure. The dictionary to be built is at the top of the dictionary
% stack. Stack handling for the procedures is:
%
% <?val0?> ... <?val(n - 1)?> <key> proc -
%
% Parameters are handle in inverse-stack order, so inter-parameter
% dependencies that on the stack can generally be used here.
%
/img_params_dict
mark
/ImageType { 1 def } .bind
/IMG_NComps { exch def } .bind % number of components
/MultipleDataSources 1 index
/Width 1 index
/Height 1 index
/ImageMatrix 1 index
/BitsPerComponent 1 index
/DataSource 1 index
% Polarity is a proxy for Decode; it never appears in a dictionary
/Polarity
{
pop
{ { 1 0 } }
{ { 0 1 } }
ifelse
/Decode exch cvlit def
}
.bind
% the definition of Decode is based on the number of components
/Decode { //img_decary 0 IMG_NComps 2 mul getinterval def } .bind
.dicttomark
def
%
% <oper_0> ... <oper_n> <array> img_build_dict <dict>
%
% Build a dictionary. This will always be done in local VM. The array is
% a list of the keys to be associated with operands on the stack, in
% inverse stack order (topmost element first). The caller should verify
% that the dictionary can be built successfully (except for a possible
% VMerror) before calling this routine.
%
/img_build_dict
{
% build the dictionary in local VM; all for 2 extra entries
.currentglobal //false .setglobal
1 index length 2 add dict
exch .setglobal
begin
% process all keys in the array
{ //img_params_dict 1 index get exec }
forall
% if BitsPerComponent is not yet defined, define it to be 1
currentdict /BitsPerComponent known not
{ /BitsPerComponent 1 def }
if
currentdict end
}
.bind def
%
% <dict> <array> img_unbuild_dict <oper_0> ... <oper_n>
%
% "Unbuild" a dictionary: spread the contents the dictionary back onto the
% stack, in the inverse of the order indicated in the array (inverse is
% used as this order is more convenient for img_build_dict, which is
% expected to be invoked far more frequently).
%
/img_unbuild_dict
{
exch begin
dup length 1 sub -1 0
{ 1 index exch get load exch }
for
pop
end
}
.bind def
%
% Check the image types that can be used as data sources
% <any> foo <bool>
%
/good_image_types mark
/filetype { pop //true } .bind
/stringtype 1 index
/arraytype //xcheck
/packedarraytype //xcheck
.dicttomark readonly def
%
% <width> <height> <bits/component> <matrix> <dsrc0> ...
% <multi> <ncomp> <has_alpha>
% img_build_image_dict
% <dict> <has_alpha>
%
% Build the dictionary corresponding to a colorimage operand stack. This
% routine will check just enough of the stack to verify that the
% dictionary can be built, and will generate the appropriate error if this
% is not the case.
%
% The <has_alpha> boolean is used to support the Next alphaimage extension.
%
% At the first level, errors in this procedure are reported as colorimage
% errors. The error actually reported will usually be determined by the
% pseudo-operator which invokes this routine.
%
/img_build_image_dict
{
% Veify that at least 8 operands are available, and that the top three
% operands have the expected types
count 8 lt
{ /.colorimage cvx /stackunderflow signalerror }
if
3 copy
type /booleantype ne exch
type /integertype ne or exch
type /booleantype ne or
{ /.colorimage cvx /typecheck signalerror }
if
% verify that the number of components is 1, 3, or 4
1 index 1 lt 2 index 2 eq or 2 index 4 gt or
{ /.colorimage cvx /rangecheck signalerror }
if
% Verify that the required number of operands are present if multiple
% data sources are being used. If this test is successful, convert
% the data sources to an array (in local VM).
2 index
{
% if an alpha component is present, this adds one more component
2 copy
{ 1 add }
if
dup count 9 sub gt
{
% Adobe interpreters appear to test the arguments sequentially
% starting from the top of the stack and report the 1st error found.
% To satisfy CET test 12-02.PS we emulate this logic.
//true exch -1 1
{ 3 add index
//good_image_types 1 index type .knownget
{ exec and
}
{ pop pop //false
}
ifelse
}
for
{ /stackunderflow
}
{ /typecheck
}
ifelse
/.colorimage cvx exch signalerror
}
if
% build the DataSource array in local VM
dup .currentglobal //false .setglobal exch array exch .setglobal
% stack: <w> <h> <bps> <mtx> <d0> ... <multi> <n> <alpha> <n'> <array>
5 1 roll 4 add 3 roll astore 4 1 roll
}
if
% the image dictionary can be built; do so
% stack: <w> <h> <bps> <mtx> <dsrc|dsrc_array> <multi> <n> <alpha>
8 1 roll //img_params_ary //img_build_dict exec exch
}
.bind def
currentdict /good_image_types .undef
%
% <?dict?>
% img_unbuild_image_dict
% <width> <height> <bits/component> <matrix> <dsrc0> ...
% <multi> <ncomp>
%
% If the top entry of the stack is a dictionary that has the keys required
% by a colorimage dictionary, unpack that dictionary onto the stack.
% Otherwise just leave things as they are. Note that the <has_alpha>
% parameter is not pushd onto the stack.
%
/img_unbuild_image_dict
{
//img_check_ary //img_check_keys exec
{
//img_unbuild_ary //img_unbuild_dict exec
1 index type /booleantype eq
{
1 index
{ 3 -1 roll aload length 2 add -2 roll }
if
}
if
}
if
}
.bind def
%
% <width> <height> <polarity> <matrix> <dsrc>
% img_unbuild_imagemask_dict
% <dict>
%
% Build the dictionary corresponding to an imagemask stack. This routine
% will verify that the appropriate number of operands are on the stack,
% and that polarity is a boolean. This is all that is necessary to build
% the dictionary.
%
/img_build_imagemask_dict
{
% check for proper number of operands
count 5 lt
{ /imagemask .systemvar /stackunderflow signalerror }
if
% verify that polarity is a boolean
2 index type /booleantype ne
{ /imagemask .systemvar /typecheck signalerror }
if
% the imagemask dictionary can be built; do so
//img_mask_params_ary //img_build_dict exec
}
.bind def
%
% <?dict?>
% img_unbuild_imagemask_dict
% <width> <height> <polarity> <matrix> <dsrc>
%
% If the top entry of the stack is a dictionary that has the keys rquired
% by an imagemask dictionary, unpack that dictionary onto the stack.
% Otherwise just leave things as they are.
%
/img_unbuild_imagemask_dict
{
//img_mask_check_ary //img_check_keys exec
{
//img_mask_unbuild_ary //img_unbuild_dict exec
3 -1 roll
dup type dup /arraytype eq exch /packedarraytype eq or
1 index rcheck and
{ 0 get 1 eq }
if
3 1 roll
}
if
}
.bind def
%
% <width> <height> <bits/component> <matrix> <dsrc_0> ...
% <multi> <ncomp> <has_alpha>
% .colorimage
% -
%
% Convert the image/colorimage operator from their traditional form to
% the dictionary form. The <has_alpha> operand is used ot support the
% Next alphaimage extension.
%
% Error handling for these operators is a bit complex, due to the stack
% handling required of operators that potentially invoke procedures.
% This problem is discussed in the comment above. The facts relevant to
% this particular implementation are:
%
% 1. The .image1 (or .alphaimage) operator is executed in a stopped
% context, so that we can undo the gsave context in the event of
% an error.
%
% 2. In the event of an error, the stack is examined to see if the
% dictionary passed to .image1 (.alphaimage) is still present.
% If so, this dictionary is "unpacked" onto the stack to re-
% create the original stack. The <has_alpha> parameter is not
% pushed onto the stack, as it is not required for any of the
% pseudo-operators than invoke this procedure.
%
% 3. The use of pseudo-operators in this case may yield incorrect
% results for late-detected errors, as the stack depth will be
% restored (even though the stack is not). This is, however, no
% worse than the prior (level >= 2) code, so it should cause no
% new problems.
%
/.colorimage
{
% build the image dictionary
//img_build_image_dict exec
% execute .image1 in a stopped context
{
gsave
% The CET test file 12-02.ps creates colorimages with a width and
% height of 0. Ignore these since that is what the CET expects.
1 index dup /Height get 0 eq exch /Width get 0 eq or
{ pop pop } % Ignore colorimage. Pop bool and dict
{
0 .setoverprintmode % disable overprint mode for images
//img_csary 2 index /IMG_NComps get get setcolorspace
{ .alphaimage }
{ .image1 }
ifelse
}
ifelse
}
stopped
grestore
{
//img_unbuild_image_dict exec
/.colorimage cvx $error /errorname get
signalerror
}
if
}
.bind def
%
% <width> <height> <bits/component> <matrix> <dsrc_0> ...
% <multi> <ncomp>
% colorimage
% -
%
% Build the colorimage pseudo-operator only if setcolorscreen is visible.
%
systemdict /setcolorscreen .knownget
{
type /operatortype eq
{
/colorimage
{
//false
//.colorimage
stopped
{ /colorimage .systemvar $error /errorname get signalerror }
if
}
.bind systemdict begin odef end
}
if
}
if
%
% width height bits_per_component matrix data_src image -
%
% <dict> image -
%
% Some special handling is required for ImageType 2 (Display PostScript
% pixmap images) so as to set the appropriate color space as the current
% color space.
%
/image
{
dup type /dicttype eq .languagelevel 2 ge and
{
dup /ImageType get dup 2 eq
{
% verify the ImageType 2 is supported
//.imagetypes exch known
{
%
% Set either DevicePixel or DeviceRGB as the current
% color space. DevicePixel is used if the image data is
% to be copied directly, with only a geometric
% transformation (PixelCopy true). The use of DeviceRGB
% in the alternate case is not, in general, correct, and
% reflects a current implementation limitation. Ideally,
% an intermediate color space should be used only if
% the source and destination color models vary; otherwise
% the native color space corresponding to the color model
% should be used.
%
% The mechanism to determine depth for the DevicePixel
% color space when BitsPerPixel is not available is
% somewhat of a hack.
%
gsave
0 .setoverprintmode % disable overprintmode for images
dup /PixelCopy .knownget dup
{ pop }
if
{
[
/DevicePixel
currentpagedevice dup /BitsPerPixel .knownget
{ exch pop }
{
/GrayValues .knownget not
{ 2 } % try a guess
if
ln 2 ln div round cvi
}
ifelse
]
}
{ /DeviceRGB }
ifelse
setcolorspace
//.imagetypes 2 get
stopped
grestore
{ /image .systemvar $error /errorname get signalerror }
if
}
{ /image .systemvar /rangecheck signalerror
}
ifelse
}
{
dup //.imagetypes exch .knownget
{
exch pop gsave
0 .setoverprintmode % disable overprintmode for images
stopped
grestore
{ /image .systemvar $error /errorname get signalerror }
if
}
{
/image .systemvar exch type /integertype eq
{ /rangecheck } { /typecheck }
ifelse signalerror
}
ifelse
}
ifelse
}
{
//false 1 //false
//.colorimage
stopped
{ /image .systemvar $error /errorname get signalerror }
if
}
ifelse
}
.bind systemdict begin odef end
% An auxiliary function for checking whether an imagemask to be interpolated.
/.is_low_resolution % <image dict> .is_low_resolution <bool>
{ % Checking whether image pixel maps to more than 2 device pixels.
% The threshold 2 is arbitrary.
1 exch 0 exch
0 exch 1 exch
/ImageMatrix get dup
2 {
4 1 roll
idtransform dtransform dup mul exch dup mul add sqrt
} repeat
max
2 gt % arbitrary
} .bind def
%
% width height polarity matrix datasrc imagemask -
%
% See the comment preceding the definition of .colorimage for information
% as to the handling of error conditions.
%
/imagemask
{
dup type /dicttype eq .languagelevel 2 ge and
{ dup /ImageType get
//.imagemasktypes exch .knownget
{ 1 index //.is_low_resolution exec
2 index /ImageType get 1 eq and
2 index /BitsPerComponent get 1 eq and
2 index /Interpolate .knownget not { //false } if and
//filterdict /ImscaleDecode known and
%%
%% Don't apply ImScaleDecode to interpolate imagemasks if
%% the current device is a high level device.
%%
currentdevice 1 dict dup /HighLevelDevice dup put .getdeviceparams
dup type /booleantype eq not {cleartomark //true}{3 1 roll cleartomark not}ifelse
and
{
% Apply interpolated imagemask scaling filter
exch .currentglobal exch dup .gcheck .setglobal
dup length dict .copydict
dup dup /DataSource get
dup type /stringtype eq {
1 array astore cvx % image.* operators read strings repeatesly
} if
mark /Width 3 index /Width get /Height 5 index /Height get .dicttomark
/ImscaleDecode filter /DataSource exch put
dup dup /Width get 4 mul /Width exch put
dup dup /Height get 4 mul /Height exch put
dup dup /ImageMatrix get
{ 4 0 0 4 0 0 } matrix concatmatrix /ImageMatrix exch put
3 1 roll .setglobal
} if
exec
}
{ % CET 12-08b.ps wants /typecheck
/imagemask .systemvar /typecheck signalerror
}
ifelse
}
{
//img_build_imagemask_dict exec
{ .imagemask1 }
stopped
{
//img_unbuild_imagemask_dict exec
/imagemask .systemvar $error /errorname get signalerror
}
if
}
ifelse
}
.bind systemdict begin odef end
end % img_utils_dict
% Conditionally turn image interpolation on or off.
% INTERPOLATE is not yet set, handle all cases
currentdict /INTERPOLATE known
currentdict /DOTERPOLATE known or
currentdict /NOTERPOLATE known or not {
currentfile 1 (%END INTERPOLATE) .subfiledecode flushfile
} if
/.interpolate {
dup /Interpolate .knownget not { //false } if
/INTERPOLATE .systemvar ne {
dup gcheck .currentglobal exch .setglobal
exch dup length dict copy
dup /Interpolate /INTERPOLATE .systemvar put
exch .setglobal
} if
} .bind odef
/colorimage
{ /INTERPOLATE .systemvar
{ .currentglobal % w h bit [] {}...{} multi ncomp glob
//false .setglobal
9 dict begin % w h bit [] {}...{} multi ncomp glob
2 .argindex { 1 index 7 add } { 8 } ifelse
dup .argindex pop % check # of arguments
copy gsave pop % preserve the arguments
{ 0 /DeviceGray 0 /DeviceRGB /DeviceCMYK }
1 index get setcolorspace % ... glob w h bit [] {}...{} multi ncomp
{0 1 0 1 0 1 0 1}
1 index 2 mul 0 exch % ... glob w h bit [] {}...{} multi ncomp {0 1 ...} 0 2*ncomp
getinterval /Decode exch def % ... glob w h bit [] {}...{} multi ncomp
exch dup % ... glob w h bit [] {}...{} ncomp multi multi
/MultipleDataSources exch def % ... glob w h bit [] {}...{} ncomp multi
{ array astore} { pop } ifelse % ... glob w h bit [] [{}...{}]
/DataSource exch def % ... glob w h bit []
/ImageMatrix exch def % ... glob w h bit
/BitsPerComponent exch def % ... glob w h
/Height exch def % ... glob w
/Width exch def % ... glob
/ImageType 1 def
/Interpolate //true def
.setglobal currentdict end % ... <<>>
image grestore
exch { 4 add } { 6 } ifelse
{ pop } repeat % -
}
{ colorimage
}
ifelse
} .bind odef
/image
{ dup type /dicttype eq
{ dup /ImageType get 3 eq
{ .currentglobal //false .setglobal exch
dup length dict copy begin .setglobal
/DataDict DataDict .interpolate def
/MaskDict MaskDict .interpolate def
currentdict end
}
{ .interpolate
}
ifelse
image
}
{ /INTERPOLATE .systemvar
{ 4 .argindex pop % check # of args
.currentglobal //false .setglobal
8 dict begin .setglobal
/ImageType 1 def
/DataSource 1 index def
/ImageMatrix 2 index def
/BitsPerComponent 3 index def
/Decode {0 1} def
/Height 4 index def
/Width 5 index def
/Interpolate //true def
currentdict end
gsave /DeviceGray setcolorspace image grestore
5 { pop } repeat
}
{ image
}
ifelse
}
ifelse
} .bind odef
/imagemask {
dup type /dicttype eq {
.interpolate imagemask
} {
/INTERPOLATE .systemvar {
4 .argindex pop % check # of args
.currentglobal //false .setglobal
8 dict begin .setglobal
/ImageType 1 def
/DataSource 1 index def
/ImageMatrix 2 index def
/BitsPerComponent 1 def
2 index { {1 0} } { {0 1} } ifelse /Decode exch def
/Height 4 index def
/Width 5 index def
/Interpolate //true def
currentdict end imagemask 5 { pop } repeat
} {
imagemask
} ifelse
} ifelse
} .bind odef
currentdict /.interpolate .undef
%END INTERPOLATE
.setglobal % restore VM mode
|