Skip to content
Snippets Groups Projects
image.lisp 101 KiB
Newer Older
dan's avatar
dan committed
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000
;;; -*- Mode:Lisp; Package:XLIB; Syntax:COMMON-LISP; Base:10; Lowercase:T -*-

;;; CLX Image functions

;;;
;;;			 TEXAS INSTRUMENTS INCORPORATED
;;;				  P.O. BOX 2909
;;;			       AUSTIN, TEXAS 78769
;;;
;;; Copyright (C) 1987 Texas Instruments Incorporated.
;;;
;;; Permission is granted to any individual or institution to use, copy, modify,
;;; and distribute this software, provided that this complete copyright and
;;; permission notice is maintained, intact, in all copies and supporting
;;; documentation.
;;;
;;; Texas Instruments Incorporated provides this software "as is" without
;;; express or implied warranty.
;;;

(in-package :xlib)

(defmacro with-image-data-buffer ((buffer size) &body body)
  (declare (indentation 0 4 1 1))
  `(let ((.reply-buffer. (allocate-reply-buffer ,size)))
     (declare (type reply-buffer .reply-buffer.))
     (unwind-protect
	 (let ((,buffer (reply-ibuf8 .reply-buffer.)))
	   (declare (type buffer-bytes ,buffer))
	   (with-vector (,buffer buffer-bytes)
	     ,@body))
       (deallocate-reply-buffer .reply-buffer.))))

(def-clx-class (image (:constructor nil) (:copier nil) (:predicate nil))
  ;; Public structure
  (width 0 :type card16 :read-only t)
  (height 0 :type card16 :read-only t)
  (depth 1 :type card8 :read-only t)
  (plist nil :type list))

;; Image-Plist accessors:
(defmacro image-name (image) `(getf (image-plist ,image) :name))
(defmacro image-x-hot (image) `(getf (image-plist ,image) :x-hot))
(defmacro image-y-hot (image) `(getf (image-plist ,image) :y-hot))
(defmacro image-red-mask (image) `(getf (image-plist ,image) :red-mask))
(defmacro image-blue-mask (image) `(getf (image-plist ,image) :blue-mask))
(defmacro image-green-mask (image) `(getf (image-plist ,image) :green-mask))

(defun print-image (image stream depth)
  (declare (type image image)
	   (ignore depth))
  (print-unreadable-object (image stream :type t)
    (when (image-name image)
      (write-string (string (image-name image)) stream)
      (write-string " " stream))
    (prin1 (image-width image) stream)
    (write-string "x" stream)
    (prin1 (image-height image) stream)
    (write-string "x" stream)
    (prin1 (image-depth image) stream)))

(#-sbcl defconstant
 #+sbcl sb-int:defconstant-eqx
 *empty-data-x* '#.(make-sequence '(array card8 (*)) 0)
 #+sbcl #'equalp)

(#-sbcl defconstant
 #+sbcl sb-int:defconstant-eqx
 *empty-data-z*
 '#.(make-array '(0 0) :element-type 'pixarray-1-element-type)
 #+sbcl #'equalp)

(def-clx-class (image-x (:include image) (:copier nil)
			(:print-function print-image))
  ;; Use this format for shoveling image data
  ;; Private structure. Accessors for these NOT exported.
  (format :z-pixmap :type (member :bitmap :xy-pixmap :z-pixmap))
  (bytes-per-line 0 :type card16)
  (bits-per-pixel 1 :type (member 1 4 8 16 24 32))
  (bit-lsb-first-p *image-bit-lsb-first-p* :type generalized-boolean)	; Bit order
  (byte-lsb-first-p *image-byte-lsb-first-p* :type generalized-boolean)	; Byte order
  (data *empty-data-x* :type (array card8 (*)))			; row-major
  (unit *image-unit* :type (member 8 16 32))			; Bitmap unit
  (pad *image-pad* :type (member 8 16 32))			; Scanline pad
  (left-pad 0 :type card8))					; Left pad

(def-clx-class (image-xy (:include image) (:copier nil)
			 (:print-function print-image))
  ;; Public structure
  ;; Use this format for image processing
  (bitmap-list nil :type list)) ;; list of bitmaps

(def-clx-class (image-z (:include image) (:copier nil)
			(:print-function print-image))
  ;; Public structure
  ;; Use this format for image processing
  (bits-per-pixel 1 :type (member 1 4 8 16 24 32))
  (pixarray *empty-data-z* :type pixarray))

(defun create-image (&key width height depth
		     (data (required-arg data))
		     plist name x-hot y-hot
		     red-mask blue-mask green-mask
		     bits-per-pixel format bytes-per-line
		     (byte-lsb-first-p 
		       #+clx-little-endian t
		       #-clx-little-endian nil)
		     (bit-lsb-first-p
		       #+clx-little-endian t
		       #-clx-little-endian nil)
		     unit pad left-pad)
  ;; Returns an image-x image-xy or image-z structure, depending on the
  ;; type of the :DATA parameter.
  (declare
    (type (or null card16) width height)	; Required
    (type (or null card8) depth)		; Defualts to 1
    (type (or buffer-bytes			; Returns image-x
	      list				; Returns image-xy
	      pixarray) data)			; Returns image-z
    (type list plist)
    (type (or null stringable) name)
    (type (or null card16) x-hot y-hot)
    (type (or null pixel) red-mask blue-mask green-mask)
    (type (or null (member 1 4 8 16 24 32)) bits-per-pixel)
    
    ;; The following parameters are ignored for image-xy and image-z:
    (type (or null (member :bitmap :xy-pixmap :z-pixmap))
	  format)				; defaults to :z-pixmap
    (type (or null card16) bytes-per-line)
    (type generalized-boolean byte-lsb-first-p bit-lsb-first-p)
    (type (or null (member 8 16 32)) unit pad)
    (type (or null card8) left-pad))
  (declare (clx-values image))
  (let ((image
	  (etypecase data
	    (buffer-bytes			; image-x
	      (let ((data data))
		(declare (type buffer-bytes data))
		(unless depth (setq depth (or bits-per-pixel 1)))
		(unless format
		  (setq format (if (= depth 1) :xy-pixmap :z-pixmap)))
		(unless bits-per-pixel
		  (setq bits-per-pixel
			(cond ((eq format :xy-pixmap) 1)
			      ((index> depth 24) 32)
			      ((index> depth 16) 24)
			      ((index> depth 8)  16)
			      ((index> depth 4)   8)
			      ((index> depth 1)   4)
			      (t                  1))))
		(unless width (required-arg width))
		(unless height (required-arg height))
		(unless bytes-per-line
		  (let* ((pad (or pad 8))
			 (bits-per-line (index* width bits-per-pixel))
			 (padded-bits-per-line
			   (index* (index-ceiling bits-per-line pad) pad)))
		    (declare (type array-index pad bits-per-line
				   padded-bits-per-line))
		    (setq bytes-per-line (index-ceiling padded-bits-per-line 8))))
		(unless unit (setq unit *image-unit*))
		(unless pad
		  (setq pad
			(dolist (pad '(32 16 8))
			  (when (and (index<= pad *image-pad*)
				     (zerop
				       (index-mod
					 (index* bytes-per-line 8) pad)))
			    (return pad)))))
		(unless left-pad (setq left-pad 0))
		(make-image-x
		  :width width :height height :depth depth :plist plist
		  :format format :data data
		  :bits-per-pixel bits-per-pixel 
		  :bytes-per-line bytes-per-line
		  :byte-lsb-first-p byte-lsb-first-p
		  :bit-lsb-first-p bit-lsb-first-p
		  :unit unit :pad pad :left-pad left-pad)))
	    (list				; image-xy
	      (let ((data data))
		(declare (type list data))
		(unless depth (setq depth (length data)))
		(when data
		  (unless width (setq width (array-dimension (car data) 1)))
		  (unless height (setq height (array-dimension (car data) 0))))
		(make-image-xy
		  :width width :height height :plist plist :depth depth
		  :bitmap-list data)))
	    (pixarray				; image-z
	      (let ((data data))
		(declare (type pixarray data))
		(unless width (setq width (array-dimension data 1)))
		(unless height (setq height (array-dimension data 0)))
		(unless bits-per-pixel
		  (setq bits-per-pixel
			(etypecase data
			  (pixarray-32 32)
			  (pixarray-24 24)
			  (pixarray-16 16)
			  (pixarray-8   8)
			  (pixarray-4   4)
			  (pixarray-1   1)))))
	      (unless depth (setq depth bits-per-pixel))
	      (make-image-z
		:width width :height height :depth depth :plist plist
		:bits-per-pixel bits-per-pixel :pixarray data)))))
    (declare (type image image))
    (when name (setf (image-name image) name))
    (when x-hot (setf (image-x-hot image) x-hot))
    (when y-hot (setf (image-y-hot image) y-hot))
    (when red-mask (setf (image-red-mask image) red-mask))
    (when blue-mask (setf (image-blue-mask image) blue-mask))
    (when green-mask (setf (image-green-mask image) green-mask))
    image))

;;;-----------------------------------------------------------------------------
;;; Swapping stuff

(defun image-noswap
       (src dest srcoff destoff srclen srcinc destinc height lsb-first-p)
  (declare (type buffer-bytes src dest)
	   (type array-index srcoff destoff srclen srcinc destinc)
	   (type card16 height)
	   (type generalized-boolean lsb-first-p)
	   (ignore lsb-first-p))
  #.(declare-buffun)
  (if (index= srcinc destinc)
      (buffer-replace
	dest src destoff
	(index+ destoff (index* srcinc (index1- height)) srclen)
	srcoff)
    (do* ((h height (index1- h))
	  (srcstart srcoff (index+ srcstart srcinc))
	  (deststart destoff (index+ deststart destinc))
	  (destend (index+ deststart srclen) (index+ deststart srclen)))
	 ((index-zerop h))
      (declare (type array-index srcstart deststart destend)
	       (type card16 h))
      (buffer-replace dest src deststart destend srcstart))))

(defun image-swap-two-bytes
       (src dest srcoff destoff srclen srcinc destinc height lsb-first-p)
  (declare (type buffer-bytes src dest)
	   (type array-index srcoff destoff srclen srcinc destinc)
	   (type card16 height)
	   (type generalized-boolean lsb-first-p))
  #.(declare-buffun)
  (with-vector (src buffer-bytes)
    (with-vector (dest buffer-bytes)
      (do ((length (index* (index-ceiling srclen 2) 2))
	   (h height (index1- h))
	   (srcstart srcoff (index+ srcstart srcinc))
	   (deststart destoff (index+ deststart destinc)))
	  ((index-zerop h))
	(declare (type array-index length srcstart deststart)
		 (type card16 h))
	(when (and (index= h 1) (not (index= srclen length)))
	  (index-decf length 2)
	  (if lsb-first-p
	      (setf (aref dest (index1+ (index+ deststart length)))
		    (the card8 (aref src (index+ srcstart length))))
	    (setf (aref dest (index+ deststart length))
		  (the card8 (aref src (index1+ (index+ srcstart length)))))))
	(do ((i length (index- i 2))
	     (srcidx srcstart (index+ srcidx 2))
	     (destidx deststart (index+ destidx 2)))
	    ((index-zerop i))
	  (declare (type array-index i srcidx destidx))
	  (setf (aref dest destidx)
		(the card8 (aref src (index1+ srcidx))))
	  (setf (aref dest (index1+ destidx))
		(the card8 (aref src srcidx))))))))

(defun image-swap-three-bytes
       (src dest srcoff destoff srclen srcinc destinc height lsb-first-p)
  (declare (type buffer-bytes src dest)
	   (type array-index srcoff destoff srclen srcinc destinc)
	   (type card16 height)
	   (type generalized-boolean lsb-first-p))
  #.(declare-buffun)
  (with-vector (src buffer-bytes)
    (with-vector (dest buffer-bytes)
      (do ((length (index* (index-ceiling srclen 3) 3))
	   (h height (index1- h))
	   (srcstart srcoff (index+ srcstart srcinc))
	   (deststart destoff (index+ deststart destinc)))
	  ((index-zerop h))
	(declare (type array-index length srcstart deststart)
		 (type card16 h))
	(when (and (index= h 1) (not (index= srclen length)))
	  (index-decf length 3)
	  (when (index= (index- srclen length) 2)
	    (setf (aref dest (index+ deststart length 1))
		  (the card8 (aref src (index+ srcstart length 1)))))
	  (if lsb-first-p
	      (setf (aref dest (index+ deststart length 2))
		    (the card8 (aref src (index+ srcstart length))))
	    (setf (aref dest (index+ deststart length))
		  (the card8 (aref src (index+ srcstart length 2))))))
	(do ((i length (index- i 3))
	     (srcidx srcstart (index+ srcidx 3))
	     (destidx deststart (index+ destidx 3)))
	    ((index-zerop i))
	  (declare (type array-index i srcidx destidx))
	  (setf (aref dest destidx)
		(the card8 (aref src (index+ srcidx 2))))
	  (setf (aref dest (index1+ destidx))
		(the card8 (aref src (index1+ srcidx))))
	  (setf (aref dest (index+ destidx 2))
		(the card8 (aref src srcidx))))))))

(defun image-swap-four-bytes
       (src dest srcoff destoff srclen srcinc destinc height lsb-first-p)
  (declare (type buffer-bytes src dest)
	   (type array-index srcoff destoff srclen srcinc destinc)
	   (type card16 height)
	   (type generalized-boolean lsb-first-p))
  #.(declare-buffun)
  (with-vector (src buffer-bytes)
    (with-vector (dest buffer-bytes)
      (do ((length (index* (index-ceiling srclen 4) 4))
	   (h height (index1- h))
	   (srcstart srcoff (index+ srcstart srcinc))
	   (deststart destoff (index+ deststart destinc)))
	  ((index-zerop h))
	(declare (type array-index length srcstart deststart)
		 (type card16 h))
	(when (and (index= h 1) (not (index= srclen length)))
	  (index-decf length 4)
	  (unless lsb-first-p
	    (setf (aref dest (index+ deststart length))
		  (the card8 (aref src (index+ srcstart length 3)))))
	  (when (if lsb-first-p
		    (index= (index- srclen length) 3)
		  (not (index-zerop (index-logand srclen 2))))
	    (setf (aref dest (index+ deststart length 1))
		  (the card8 (aref src (index+ srcstart length 2)))))
	  (when (if (null lsb-first-p)
		    (index= (index- srclen length) 3)
		  (not (index-zerop (index-logand srclen 2))))
	    (setf (aref dest (index+ deststart length 2))
		  (the card8 (aref src (index+ srcstart length 1)))))
	  (when lsb-first-p
	    (setf (aref dest (index+ deststart length 3))
		  (the card8 (aref src (index+ srcstart length))))))
	(do ((i length (index- i 4))
	     (srcidx srcstart (index+ srcidx 4))
	     (destidx deststart (index+ destidx 4)))
	    ((index-zerop i))
	  (declare (type array-index i srcidx destidx))
	  (setf (aref dest destidx)
		(the card8 (aref src (index+ srcidx 3))))
	  (setf (aref dest (index1+ destidx))
		(the card8 (aref src (index+ srcidx 2))))
	  (setf (aref dest (index+ destidx 2))
		(the card8 (aref src (index1+ srcidx))))
	  (setf (aref dest (index+ destidx 3))
		(the card8 (aref src srcidx))))))))

(defun image-swap-words
       (src dest srcoff destoff srclen srcinc destinc height lsb-first-p)
  (declare (type buffer-bytes src dest)
	   (type array-index srcoff destoff srclen srcinc destinc)
	   (type card16 height)
	   (type generalized-boolean lsb-first-p))
  #.(declare-buffun)
  (with-vector (src buffer-bytes)
    (with-vector (dest buffer-bytes)
      (do ((length (index* (index-ceiling srclen 4) 4))
	   (h height (index1- h))
	   (srcstart srcoff (index+ srcstart srcinc))
	   (deststart destoff (index+ deststart destinc)))
	  ((index-zerop h))
	(declare (type array-index length srcstart deststart)
		 (type card16 h))
	(when (and (index= h 1) (not (index= srclen length)))
	  (index-decf length 4)
	  (unless lsb-first-p
	    (setf (aref dest (index+ deststart length 1))
		  (the card8 (aref src (index+ srcstart length 3)))))
	  (when (if lsb-first-p
		    (index= (index- srclen length) 3)
		  (not (index-zerop (index-logand srclen 2))))
	    (setf (aref dest (index+ deststart length))
		  (the card8 (aref src (index+ srcstart length 2)))))
	  (when (if (null lsb-first-p)
		    (index= (index- srclen length) 3)
		  (not (index-zerop (index-logand srclen 2))))
	    (setf (aref dest (index+ deststart length 3))
		  (the card8 (aref src (index+ srcstart length 1)))))
	  (when lsb-first-p
	    (setf (aref dest (index+ deststart length 2))
		  (the card8 (aref src (index+ srcstart length))))))
	(do ((i length (index- i 4))
	     (srcidx srcstart (index+ srcidx 4))
	     (destidx deststart (index+ destidx 4)))
	    ((index-zerop i))
	  (declare (type array-index i srcidx destidx))
	  (setf (aref dest destidx)
		(the card8 (aref src (index+ srcidx 2))))
	  (setf (aref dest (index1+ destidx))
		(the card8 (aref src (index+ srcidx 3))))
	  (setf (aref dest (index+ destidx 2))
		(the card8 (aref src srcidx)))
	  (setf (aref dest (index+ destidx 3))
		(the card8 (aref src (index1+ srcidx)))))))))

(defun image-swap-nibbles
       (src dest srcoff destoff srclen srcinc destinc height lsb-first-p)
  (declare (type buffer-bytes src dest)
	   (type array-index srcoff destoff srclen srcinc destinc)
	   (type card16 height)
	   (type generalized-boolean lsb-first-p)
	   (ignore lsb-first-p))
  #.(declare-buffun)
  (with-vector (src buffer-bytes)
    (with-vector (dest buffer-bytes)
      (do ((h height (index1- h))
	   (srcstart srcoff (index+ srcstart srcinc))
	   (deststart destoff (index+ deststart destinc)))
	  ((index-zerop h))
	(declare (type array-index srcstart deststart)
		 (type card16 h))
	(do ((i srclen (index1- i))
	     (srcidx srcstart (index1+ srcidx))
	     (destidx deststart (index1+ destidx)))
	    ((index-zerop i))
	  (declare (type array-index i srcidx destidx))
	  (setf (aref dest destidx)
		(the card8
		     (let ((byte (aref src srcidx)))
		       (declare (type card8 byte))
		       (dpb (the card4 (ldb (byte 4 0) byte))
			    (byte 4 4)
			    (the card4 (ldb (byte 4 4) byte)))))))))))

(defun image-swap-nibbles-left
       (src dest srcoff destoff srclen srcinc destinc height lsb-first-p)
  (declare (type buffer-bytes src dest)
	   (type array-index srcoff destoff srclen srcinc destinc)
	   (type card16 height)
	   (type generalized-boolean lsb-first-p)
	   (ignore lsb-first-p))
  #.(declare-buffun)
  (with-vector (src buffer-bytes)
    (with-vector (dest buffer-bytes)
      (do ((h height (index1- h))
	   (srcstart srcoff (index+ srcstart srcinc))
	   (deststart destoff (index+ deststart destinc)))
	  ((index-zerop h))
	(declare (type array-index srcstart deststart)
		 (type card16 h))
	(do ((i srclen (index1- i))
	     (srcidx srcstart (index1+ srcidx))
	     (destidx deststart (index1+ destidx)))
	    ((index= i 1)
	     (setf (aref dest destidx)
		   (the card8
			(let ((byte1 (aref src srcidx)))
			  (declare (type card8 byte1))
			  (dpb (the card4 (ldb (byte 4 0) byte1))
			       (byte 4 4)
			       0)))))
	  (declare (type array-index i srcidx destidx))
	  (setf (aref dest destidx)
		(the card8
		     (let ((byte1 (aref src srcidx))
			   (byte2 (aref src (index1+ srcidx))))
		       (declare (type card8 byte1 byte2))
		       (dpb (the card4 (ldb (byte 4 0) byte1))
			    (byte 4 4)
			    (the card4 (ldb (byte 4 4) byte2)))))))))))

(#-sbcl defconstant
 #+sbcl sb-int:defconstant-eqx
 *image-byte-reverse*
 '#.(coerce
     '#(
	0 128 64 192 32 160 96 224 16 144 80 208 48 176 112 240
	8 136 72 200 40 168 104 232 24 152 88 216 56 184 120 248
	4 132 68 196 36 164 100 228 20 148 84 212 52 180 116 244
	12 140 76 204 44 172 108 236 28 156 92 220 60 188 124 252
	2 130 66 194 34 162 98 226 18 146 82 210 50 178 114 242
	10 138 74 202 42 170 106 234 26 154 90 218 58 186 122 250
	6 134 70 198 38 166 102 230 22 150 86 214 54 182 118 246
	14 142 78 206 46 174 110 238 30 158 94 222 62 190 126 254
	1 129 65 193 33 161 97 225 17 145 81 209 49 177 113 241
	9 137 73 201 41 169 105 233 25 153 89 217 57 185 121 249
	5 133 69 197 37 165 101 229 21 149 85 213 53 181 117 245
	13 141 77 205 45 173 109 237 29 157 93 221 61 189 125 253
	3 131 67 195 35 163 99 227 19 147 83 211 51 179 115 243
	11 139 75 203 43 171 107 235 27 155 91 219 59 187 123 251
	7 135 71 199 39 167 103 231 23 151 87 215 55 183 119 247
	15 143 79 207 47 175 111 239 31 159 95 223 63 191 127 255)
     '(vector card8))
  #+sbcl #'equalp)

(defun image-swap-bits
       (src dest srcoff destoff srclen srcinc destinc height lsb-first-p)
  (declare (type buffer-bytes src dest)
	   (type array-index srcoff destoff srclen srcinc destinc)
	   (type card16 height)
	   (type generalized-boolean lsb-first-p)
	   (ignore lsb-first-p))
  #.(declare-buffun)
  (with-vector (src buffer-bytes)
    (with-vector (dest buffer-bytes)
      (let ((byte-reverse *image-byte-reverse*))
	(with-vector (byte-reverse (simple-array card8 (256)))
	  (macrolet ((br (byte)
		       `(the card8 (aref byte-reverse (the card8 ,byte)))))
	    (do ((h height (index1- h))
		 (srcstart srcoff (index+ srcstart srcinc))
		 (deststart destoff (index+ deststart destinc)))
		((index-zerop h))
	      (declare (type array-index srcstart deststart)
		       (type card16 h))
	      (do ((i srclen (index1- i))
		   (srcidx srcstart (index1+ srcidx))
		   (destidx deststart (index1+ destidx)))
		  ((index-zerop i))
		(declare (type array-index i srcidx destidx))
		(setf (aref dest destidx) (br (aref src srcidx)))))))))))

(defun image-swap-bits-and-two-bytes
       (src dest srcoff destoff srclen srcinc destinc height lsb-first-p)
  (declare (type buffer-bytes src dest)
	   (type array-index srcoff destoff srclen srcinc destinc)
	   (type card16 height)
	   (type generalized-boolean lsb-first-p))
  #.(declare-buffun)
  (with-vector (src buffer-bytes)
    (with-vector (dest buffer-bytes)
      (let ((byte-reverse *image-byte-reverse*))
	(with-vector (byte-reverse (simple-array card8 (256)))
	  (macrolet ((br (byte)
		       `(the card8 (aref byte-reverse (the card8 ,byte)))))
	    (do ((length (index* (index-ceiling srclen 2) 2))
		 (h height (index1- h))
		 (srcstart srcoff (index+ srcstart srcinc))
		 (deststart destoff (index+ deststart destinc)))
		((index-zerop h))
	      (declare (type array-index length srcstart deststart)
		       (type card16 h))
	      (when (and (index= h 1) (not (index= srclen length)))
		(index-decf length 2)
		(if lsb-first-p
		    (setf (aref dest (index1+ (index+ deststart length)))
			  (br (aref src (index+ srcstart length))))
		  (setf (aref dest (index+ deststart length))
			(br (aref src (index1+ (index+ srcstart length)))))))
	      (do ((i length (index- i 2))
		   (srcidx srcstart (index+ srcidx 2))
		   (destidx deststart (index+ destidx 2)))
		  ((index-zerop i))
		(declare (type array-index i srcidx destidx))
		(setf (aref dest destidx)
		      (br (aref src (index1+ srcidx))))
		(setf (aref dest (index1+ destidx))
		      (br (aref src srcidx)))))))))))

(defun image-swap-bits-and-four-bytes
       (src dest srcoff destoff srclen srcinc destinc height lsb-first-p)
  (declare (type buffer-bytes src dest)
	   (type array-index srcoff destoff srclen srcinc destinc)
	   (type card16 height)
	   (type generalized-boolean lsb-first-p))
  #.(declare-buffun)
  (with-vector (src buffer-bytes)
    (with-vector (dest buffer-bytes)
      (let ((byte-reverse *image-byte-reverse*))
	(with-vector (byte-reverse (simple-array card8 (256)))
	  (macrolet ((br (byte)
		       `(the card8 (aref byte-reverse (the card8 ,byte)))))
	    (do ((length (index* (index-ceiling srclen 4) 4))
		 (h height (index1- h))
		 (srcstart srcoff (index+ srcstart srcinc))
		 (deststart destoff (index+ deststart destinc)))
		((index-zerop h))
	      (declare (type array-index length srcstart deststart)
		       (type card16 h))
	      (when (and (index= h 1) (not (index= srclen length)))
		(index-decf length 4)
		(unless lsb-first-p
		  (setf (aref dest (index+ deststart length))
			(br (aref src (index+ srcstart length 3)))))
		(when (if lsb-first-p
			  (index= (index- srclen length) 3)
			(not (index-zerop (index-logand srclen 2))))
		  (setf (aref dest (index+ deststart length 1))
			(br (aref src (index+ srcstart length 2)))))
		(when (if (null lsb-first-p)
			  (index= (index- srclen length) 3)
			(not (index-zerop (index-logand srclen 2))))
		  (setf (aref dest (index+ deststart length 2))
			(br (aref src (index+ srcstart length 1)))))
		(when lsb-first-p
		  (setf (aref dest (index+ deststart length 3))
			(br (aref src (index+ srcstart length))))))
	      (do ((i length (index- i 4))
		   (srcidx srcstart (index+ srcidx 4))
		   (destidx deststart (index+ destidx 4)))
		  ((index-zerop i))
		(declare (type array-index i srcidx destidx))
		(setf (aref dest destidx)
		      (br (aref src (index+ srcidx 3))))
		(setf (aref dest (index1+ destidx))
		      (br (aref src (index+ srcidx 2))))
		(setf (aref dest (index+ destidx 2))
		      (br (aref src (index1+ srcidx))))
		(setf (aref dest (index+ destidx 3))
		      (br (aref src srcidx)))))))))))

(defun image-swap-bits-and-words
       (src dest srcoff destoff srclen srcinc destinc height lsb-first-p)
  (declare (type buffer-bytes src dest)
	   (type array-index srcoff destoff srclen srcinc destinc)
	   (type card16 height)
	   (type generalized-boolean lsb-first-p))
  #.(declare-buffun)
  (with-vector (src buffer-bytes)
    (with-vector (dest buffer-bytes)
      (let ((byte-reverse *image-byte-reverse*))
	(with-vector (byte-reverse (simple-array card8 (256)))
	  (macrolet ((br (byte)
		       `(the card8 (aref byte-reverse (the card8 ,byte)))))
	    (do ((length (index* (index-ceiling srclen 4) 4))
		 (h height (index1- h))
		 (srcstart srcoff (index+ srcstart srcinc))
		 (deststart destoff (index+ deststart destinc)))
		((index-zerop h))
	      (declare (type array-index length srcstart deststart)
		       (type card16 h))
	      (when (and (index= h 1) (not (index= srclen length)))
		(index-decf length 4)
		(unless lsb-first-p
		  (setf (aref dest (index+ deststart length 1))
			(br (aref src (index+ srcstart length 3)))))
		(when (if lsb-first-p
			  (index= (index- srclen length) 3)
			(not (index-zerop (index-logand srclen 2))))
		  (setf (aref dest (index+ deststart length))
			(br (aref src (index+ srcstart length 2)))))
		(when (if (null lsb-first-p)
			  (index= (index- srclen length) 3)
			(not (index-zerop (index-logand srclen 2))))
		  (setf (aref dest (index+ deststart length 3))
			(br (aref src (index+ srcstart length 1)))))
		(when lsb-first-p
		  (setf (aref dest (index+ deststart length 2))
			(br (aref src (index+ srcstart length))))))
	      (do ((i length (index- i 4))
		   (srcidx srcstart (index+ srcidx 4))
		   (destidx deststart (index+ destidx 4)))
		  ((index-zerop i))
		(declare (type array-index i srcidx destidx))
		(setf (aref dest destidx)
		      (br (aref src (index+ srcidx 2))))
		(setf (aref dest (index1+ destidx))
		      (br (aref src (index+ srcidx 3))))
		(setf (aref dest (index+ destidx 2))
		      (br (aref src srcidx)))
		(setf (aref dest (index+ destidx 3))
		      (br (aref src (index1+ srcidx))))))))))))

;;; The following table gives the bit ordering within bytes (when accessed
;;; sequentially) for a scanline containing 32 bits, with bits numbered 0 to
;;; 31, where bit 0 should be leftmost on the display.  For a given byte
;;; labelled A-B, A is for the most significant bit of the byte, and B is
;;; for the least significant bit.
;;; 
;;; legend:
;;; 	1   scanline-unit = 8
;;; 	2   scanline-unit = 16
;;; 	4   scanline-unit = 32
;;; 	M   byte-order = MostSignificant
;;; 	L   byte-order = LeastSignificant
;;; 	m   bit-order = MostSignificant
;;; 	l   bit-order = LeastSignificant
;;; 
;;; 
;;; format	ordering
;;; 
;;; 1Mm	00-07 08-15 16-23 24-31
;;; 2Mm	00-07 08-15 16-23 24-31
;;; 4Mm	00-07 08-15 16-23 24-31
;;; 1Ml	07-00 15-08 23-16 31-24
;;; 2Ml	15-08 07-00 31-24 23-16
;;; 4Ml	31-24 23-16 15-08 07-00
;;; 1Lm	00-07 08-15 16-23 24-31
;;; 2Lm	08-15 00-07 24-31 16-23
;;; 4Lm	24-31 16-23 08-15 00-07
;;; 1Ll	07-00 15-08 23-16 31-24
;;; 2Ll	07-00 15-08 23-16 31-24
;;; 4Ll	07-00 15-08 23-16 31-24
;;; 
;;; 
;;; The following table gives the required conversion between any two
;;; formats.  It is based strictly on the table above.  If you believe one,
;;; you should believe the other.
;;; 
;;; legend:
;;; 	n   no changes
;;; 	s   reverse 8-bit units within 16-bit units
;;; 	l   reverse 8-bit units within 32-bit units
;;; 	w   reverse 16-bit units within 32-bit units
;;; 	r   reverse bits within 8-bit units
;;; 	sr  s+R
;;; 	lr  l+R
;;; 	wr  w+R

(#-sbcl defconstant
 #+sbcl sb-int:defconstant-eqx
	
 *image-swap-function*
 '#.(make-array
     '(12 12) :initial-contents
     (let ((n  'image-noswap)
	   (s  'image-swap-two-bytes)
	   (l  'image-swap-four-bytes)
	   (w  'image-swap-words)
	   (r  'image-swap-bits)
	   (sr 'image-swap-bits-and-two-bytes)
	   (lr 'image-swap-bits-and-four-bytes)
	   (wr 'image-swap-bits-and-words))
       (list #|             1Mm 2Mm 4Mm 1Ml 2Ml 4Ml 1Lm 2Lm 4Lm 1Ll 2Ll 4Ll  |#
	(list #| 1Mm |# n   n   n   r   sr  lr  n   s   l   r   r   r )
	(list #| 2Mm |# n   n   n   r   sr  lr  n   s   l   r   r   r )
	(list #| 4Mm |# n   n   n   r   sr  lr  n   s   l   r   r   r )
	(list #| 1Ml |# r   r   r   n   s   l   r   sr  lr  n   n   n )
	(list #| 2Ml |# sr  sr  sr  s   n   w   sr  r   wr  s   s   s )
	(list #| 4Ml |# lr  lr  lr  l   w   n   lr  wr  r   l   l   l )
	(list #| 1Lm |# n   n   n   r   sr  lr  n   s   l   r   r   r )
	(list #| 2Lm |# s   s   s   sr  r   wr  s   n   w   sr  sr  sr)
	(list #| 4Lm |# l   l   l   lr  wr  r   l   w   n   lr  lr  lr)
	(list #| 1Ll |# r   r   r   n   s   l   r   sr  lr  n   n   n )
	(list #| 2Ll |# r   r   r   n   s   l   r   sr  lr  n   n   n )
	(list #| 4Ll |# r   r   r   n   s   l   r   sr  lr  n   n   n ))))
  #+sbcl #'equalp)

;;; Of course, the table above is a lie.  We also need to factor in the
;;; order of the source data to cope with swapping half of a unit at the
;;; end of a scanline, since we are trying to avoid de-ref'ing off the
;;; end of the source.
;;;
;;; Defines whether the first half of a unit has the first half of the data

(#-sbcl defconstant
 #+sbcl sb-int:defconstant-eqx
	
 *image-swap-lsb-first-p*
 '#.(make-array
     12 :initial-contents
     (list t   #| 1mm |#
	   t   #| 2mm |#
	   t   #| 4mm |#
	   t   #| 1ml |#
	   nil #| 2ml |#
	   nil #| 4ml |#
	   t   #| 1lm |#
	   nil #| 2lm |#
	   nil #| 4lm |#
	   t   #| 1ll |#
	   t   #| 2ll |#
	   t   #| 4ll |#
	   ))
 #+sbcl #'equalp)

(defun image-swap-function
       (bits-per-pixel
	from-bitmap-unit from-byte-lsb-first-p from-bit-lsb-first-p
	to-bitmap-unit to-byte-lsb-first-p to-bit-lsb-first-p)
  (declare (type (member 1 4 8 16 24 32) bits-per-pixel)
	   (type (member 8 16 32) from-bitmap-unit to-bitmap-unit)
	   (type generalized-boolean from-byte-lsb-first-p from-bit-lsb-first-p
		 to-byte-lsb-first-p to-bit-lsb-first-p)
	   (clx-values function lsb-first-p))
  (cond ((index= bits-per-pixel 1)
	 (let ((from-index
		 (index+
		   (ecase from-bitmap-unit (32 2) (16 1) (8 0))
		   (if from-bit-lsb-first-p 3 0)
		   (if from-byte-lsb-first-p 6 0))))
	   (values
	     (aref *image-swap-function* from-index
		   (index+
		     (ecase to-bitmap-unit (32 2) (16 1) (8 0))
		     (if to-bit-lsb-first-p 3 0)
		     (if to-byte-lsb-first-p 6 0)))
	     (aref *image-swap-lsb-first-p* from-index))))
	(t
	 (values 
	   (if (if (index= bits-per-pixel 4)
		   (eq from-bit-lsb-first-p to-bit-lsb-first-p)
		 (eq from-byte-lsb-first-p to-byte-lsb-first-p))
	       'image-noswap
	     (ecase bits-per-pixel
	       (4  'image-swap-nibbles)
	       (8  'image-noswap)
	       (16 'image-swap-two-bytes)
	       (24 'image-swap-three-bytes)
	       (32 'image-swap-four-bytes)))
	   from-byte-lsb-first-p))))


;;;-----------------------------------------------------------------------------
;;; GET-IMAGE

(defun read-pixarray-1 (buffer-bbuf index array x y width height  
			padded-bytes-per-line bits-per-pixel)
  (declare (type buffer-bytes buffer-bbuf)
	   (type pixarray-1 array)
	   (type card16 x y width height)
	   (type array-index index padded-bytes-per-line)
	   (type (member 1 4 8 16 24 32) bits-per-pixel)
	   (ignore bits-per-pixel))
  #.(declare-buffun)
  (with-vector (buffer-bbuf buffer-bytes)
    (do* ((start (index+ index
			 (index* y padded-bytes-per-line)
			 (index-ceiling x 8))
		 (index+ start padded-bytes-per-line))
	  (y 0 (index1+ y))
	  (left-bits (the array-index
			  (mod (the (integer #x-FFFF 0) (- x))
			       8)))
	  (right-bits (index-mod (index- width left-bits) 8))
	  (middle-bits (- width left-bits right-bits))
	  (middle-bytes (floor middle-bits 8)))
	 ((index>= y height))
      (declare (type array-index start y left-bits right-bits))
      (declare (fixnum middle-bits middle-bytes))
      (cond ((< middle-bits 0)
	     (let ((byte (aref buffer-bbuf (index1- start)))
		   (x left-bits))
	       (declare (type card8 byte)
			(type array-index x))
	       (when (index> right-bits 6)
		 (setf (aref array y (index- x 1))
		       (read-image-load-byte 1 7 byte)))
	       (when (and (index> left-bits 1)
			  (index> right-bits 5))
		 (setf (aref array y (index- x 2))
		       (read-image-load-byte 1 6 byte)))
	       (when (and (index> left-bits 2)
			  (index> right-bits 4))
		 (setf (aref array y (index- x 3))
		       (read-image-load-byte 1 5 byte)))
	       (when (and (index> left-bits 3)
			  (index> right-bits 3))
		 (setf (aref array y (index- x 4))
		       (read-image-load-byte 1 4 byte)))
	       (when (and (index> left-bits 4)
			  (index> right-bits 2))
		 (setf (aref array y (index- x 5))
		       (read-image-load-byte 1 3 byte)))
	       (when (and (index> left-bits 5)
			  (index> right-bits 1))
		 (setf (aref array y (index- x 6))
		       (read-image-load-byte 1 2 byte)))
	       (when (index> left-bits 6)
		 (setf (aref array y (index- x 7))
		       (read-image-load-byte 1 1 byte)))))
	    (t
	     (unless (index-zerop left-bits)
	       (let ((byte (aref buffer-bbuf (index1- start)))
		     (x left-bits))
		 (declare (type card8 byte)
			  (type array-index x))
		 (setf (aref array y (index- x 1))
		       (read-image-load-byte 1 7 byte))
		 (when (index> left-bits 1)
		   (setf (aref array y (index- x 2))
			 (read-image-load-byte 1 6 byte))
		   (when (index> left-bits 2)
		     (setf (aref array y (index- x 3))
			   (read-image-load-byte 1 5 byte))
		     (when (index> left-bits 3)
		       (setf (aref array y (index- x 4))
			     (read-image-load-byte 1 4 byte))
		       (when (index> left-bits 4)
			 (setf (aref array y (index- x 5))
			       (read-image-load-byte 1 3 byte))
			 (when (index> left-bits 5)
			   (setf (aref array y (index- x 6))
				 (read-image-load-byte 1 2 byte))
			   (when (index> left-bits 6)
			     (setf (aref array y (index- x 7))
				   (read-image-load-byte 1 1 byte))
			     ))))))))
	     (do* ((end (index+ start middle-bytes))
		   (i start (index1+ i))
		   (x left-bits (index+ x 8)))
		  ((index>= i end)
		   (unless (index-zerop right-bits)
		     (let ((byte (aref buffer-bbuf end))
			   (x (index+ left-bits middle-bits)))
		       (declare (type card8 byte)
				(type array-index x))
		       (setf (aref array y (index+ x 0))
			     (read-image-load-byte 1 0 byte))
		       (when (index> right-bits 1)
			 (setf (aref array y (index+ x 1))
			       (read-image-load-byte 1 1 byte))
			 (when (index> right-bits 2)
			   (setf (aref array y (index+ x 2))
				 (read-image-load-byte 1 2 byte))
			   (when (index> right-bits 3)
			     (setf (aref array y (index+ x 3))
				   (read-image-load-byte 1 3 byte))
			     (when (index> right-bits 4)
			       (setf (aref array y (index+ x 4))
				     (read-image-load-byte 1 4 byte))
			       (when (index> right-bits 5)
				 (setf (aref array y (index+ x 5))
				       (read-image-load-byte 1 5 byte))
				 (when (index> right-bits 6)
				   (setf (aref array y (index+ x 6))
					 (read-image-load-byte 1 6 byte))
				   )))))))))
	       (declare (type array-index end i x))
	       (let ((byte (aref buffer-bbuf i)))
		 (declare (type card8 byte))
		 (setf (aref array y (index+ x 0))
		       (read-image-load-byte 1 0 byte))
		 (setf (aref array y (index+ x 1))
		       (read-image-load-byte 1 1 byte))
		 (setf (aref array y (index+ x 2))
		       (read-image-load-byte 1 2 byte))
		 (setf (aref array y (index+ x 3))
		       (read-image-load-byte 1 3 byte))
		 (setf (aref array y (index+ x 4))
		       (read-image-load-byte 1 4 byte))
		 (setf (aref array y (index+ x 5))
		       (read-image-load-byte 1 5 byte))
		 (setf (aref array y (index+ x 6))
		       (read-image-load-byte 1 6 byte))
		 (setf (aref array y (index+ x 7))
		       (read-image-load-byte 1 7 byte))))
	     )))))

(defun read-pixarray-4 (buffer-bbuf index array x y width height 
			padded-bytes-per-line bits-per-pixel)
  (declare (type buffer-bytes buffer-bbuf)
	   (type pixarray-4 array)
	   (type card16 x y width height)
	   (type array-index index padded-bytes-per-line)
	   (type (member 1 4 8 16 24 32) bits-per-pixel)
	   (ignore bits-per-pixel))
  #.(declare-buffun)
  (with-vector (buffer-bbuf buffer-bytes)
    (do* ((start (index+ index
			 (index* y padded-bytes-per-line)
			 (index-ceiling x 2))
		 (index+ start padded-bytes-per-line))
	  (y 0 (index1+ y))
	  (left-nibbles (mod (the fixnum (- x)) 2))
	  (right-nibbles (index-mod (index- width left-nibbles) 2))
	  (middle-nibbles (index- width left-nibbles right-nibbles))
	  (middle-bytes (index-floor middle-nibbles 2)))
	 ((index>= y height))
      (declare (type array-index start y
		     left-nibbles right-nibbles middle-nibbles middle-bytes))
      (unless (index-zerop left-nibbles)
	(setf (aref array y 0)
	      (read-image-load-byte
		4 4 (aref buffer-bbuf (index1- start)))))
      (do* ((end (index+ start middle-bytes))
	    (i start (index1+ i))
	    (x left-nibbles (index+ x 2)))
	   ((index>= i end)
	    (unless (index-zerop right-nibbles)
	      (setf (aref array y (index+ left-nibbles middle-nibbles))
		    (read-image-load-byte 4 0 (aref buffer-bbuf end)))))
	(declare (type array-index end i x))
	(let ((byte (aref buffer-bbuf i)))
	  (declare (type card8 byte))
	  (setf (aref array y (index+ x 0))
		(read-image-load-byte 4 0 byte))
	  (setf (aref array y (index+ x 1))
		(read-image-load-byte 4 4 byte))))
      )))

(defun read-pixarray-8 (buffer-bbuf index array x y width height 
			padded-bytes-per-line bits-per-pixel)
  (declare (type buffer-bytes buffer-bbuf)
	   (type pixarray-8 array)
	   (type card16 x y width height)
	   (type array-index index padded-bytes-per-line)
	   (type (member 1 4 8 16 24 32) bits-per-pixel)
	   (ignore bits-per-pixel))
  #.(declare-buffun)
  (with-vector (buffer-bbuf buffer-bytes)
    (do* ((start (index+ index
			 (index* y padded-bytes-per-line)
			 x)
		 (index+ start padded-bytes-per-line))
	  (y 0 (index1+ y)))
	 ((index>= y height))
      (declare (type array-index start y))