summaryrefslogtreecommitdiff
path: root/image/xcb_image.c
blob: 701dda407c3801b85e3cc4dd7ca99dd3b6acb431 (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
/* Copyright (C) 2007 Bart Massey
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 * Except as contained in this notice, the names of the authors or their
 * institutions shall not be used in advertising or otherwise to promote the
 * sale, use or other dealings in this Software without prior written
 * authorization from the authors.
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <xcb/xcb.h>
#include <xcb/shm.h>
#include "../aux/xcb_aux.h"
#include "../aux/xcb_bitops.h"
#include "xcb_image.h"
#define BUILD
#include "xcb_pixel.h"


static xcb_format_t *
find_format_by_depth (const xcb_setup_t *setup, uint8_t depth)
{ 
  xcb_format_t *fmt = xcb_setup_pixmap_formats(setup);
  xcb_format_t *fmtend = fmt + xcb_setup_pixmap_formats_length(setup);
  for(; fmt != fmtend; ++fmt)
      if(fmt->depth == depth)
	  return fmt;
  return 0;
}


static xcb_image_format_t
effective_format(xcb_image_format_t format, uint8_t bpp)
{
    if (format == XCB_IMAGE_FORMAT_Z_PIXMAP && bpp != 1)
	    return format;
    return XCB_IMAGE_FORMAT_XY_PIXMAP;
}


static int
format_valid (uint8_t depth, uint8_t bpp, uint8_t unit,
	      xcb_image_format_t format, uint8_t xpad)
{
  xcb_image_format_t  ef = effective_format(format, bpp);
  if (depth > bpp)
      return 0;
  switch(ef) {
  case XCB_IMAGE_FORMAT_XY_PIXMAP:
      switch(unit) {
      case 8:
      case 16:
      case 32:
	  break;
      default:
	  return 0;
      }
      if (xpad < bpp)
	  return 0;
      switch (xpad) {
      case 8:
      case 16:
      case 32:
	  break;
      default:
	  return 0;
      }
      break;
  case XCB_IMAGE_FORMAT_Z_PIXMAP:
      switch (bpp) {
      case 4:
	  if (unit != 8)
	      return 0;
	  break;
      case 8:
      case 16:
      case 24:
      case 32:
	  if (unit != bpp)
	      return 0;
	  break;
      default:
	  return 0;
      }
      break;
  default:
      return 0;
  }
  return 1;
}


static int
image_format_valid (xcb_image_t *image) {
    return format_valid(image->depth,
			image->bpp,
			image->unit,
			image->format,
			image->scanline_pad);
}


void
xcb_image_annotate (xcb_image_t *image)
{
  xcb_image_format_t  ef = effective_format(image->format, image->bpp);
  switch (ef) {
  case XCB_IMAGE_FORMAT_XY_PIXMAP:
      image->stride = xcb_roundup(image->width, image->scanline_pad) >> 3;
      image->size = image->height * image->stride * image->depth;
      break;
  case XCB_IMAGE_FORMAT_Z_PIXMAP:
      image->stride = xcb_roundup((uint32_t)image->width *
				  (uint32_t)image->bpp,
				  image->scanline_pad) >> 3;
      image->size = image->height * image->stride;
      break;
  default:
      assert(0);
  }
}


xcb_image_t *
xcb_image_create_native (xcb_connection_t *  c,
			 uint16_t            width,
			 uint16_t            height,
			 xcb_image_format_t  format,
			 uint8_t             depth,
			 void *              base,
			 uint32_t            bytes,
			 uint8_t *           data)
{
  const xcb_setup_t *  setup = xcb_get_setup(c);
  xcb_format_t *       fmt;
  xcb_image_format_t   ef = format;
  
  if (ef == XCB_IMAGE_FORMAT_Z_PIXMAP && depth == 1)
      ef = XCB_IMAGE_FORMAT_XY_PIXMAP;
  switch (ef) {
  case XCB_IMAGE_FORMAT_XY_BITMAP:
      if (depth != 1)
	  return 0;
      /* fall through */
  case XCB_IMAGE_FORMAT_XY_PIXMAP:
      if (depth > 1) {
	  fmt = find_format_by_depth(setup, depth);
	  if (!fmt)
	      return 0;
      }
      return xcb_image_create(width, height, format,
			      setup->bitmap_format_scanline_pad,
			      depth, depth, setup->bitmap_format_scanline_unit,
			      setup->image_byte_order,
			      setup->bitmap_format_bit_order,
			      base, bytes, data);
  case XCB_IMAGE_FORMAT_Z_PIXMAP:
      fmt = find_format_by_depth(setup, depth);
      if (!fmt)
	  return 0;
      return xcb_image_create(width, height, format,
			      fmt->scanline_pad,
			      fmt->depth, fmt->bits_per_pixel, 0,
			      setup->image_byte_order,
			      XCB_IMAGE_ORDER_MSB_FIRST,
			      base, bytes, data);
  default:
      assert(0);
  }
  assert(0);
}


xcb_image_t *
xcb_image_create (uint16_t           width,
		  uint16_t           height,
		  xcb_image_format_t format,
		  uint8_t            xpad,
		  uint8_t            depth,
		  uint8_t            bpp,
		  uint8_t            unit,
		  xcb_image_order_t  byte_order,
		  xcb_image_order_t  bit_order,
		  void *             base,
		  uint32_t           bytes,
		  uint8_t *          data)
{
  xcb_image_t *  image;

  if (unit == 0) {
      switch (format) {
      case XCB_IMAGE_FORMAT_XY_BITMAP:
      case XCB_IMAGE_FORMAT_XY_PIXMAP:
	  unit = 32;
	  break;
      case XCB_IMAGE_FORMAT_Z_PIXMAP:
	  if (bpp == 1) {
	      unit = 32;
	      break;
	  }
	  if (bpp < 8) {
	      unit = 8;
	      break;
	  }
	  unit = bpp;
	  break;
      }
  }
  if (!format_valid(depth, bpp, unit, format, xpad))
      return 0;
  image = malloc(sizeof(*image));
  if (image == 0)
      return 0;
  image->width = width;
  image->height = height;
  image->format = format;
  image->scanline_pad = xpad;
  image->depth = depth;
  image->bpp = bpp;
  image->unit = unit;
  image->plane_mask = xcb_mask(depth);
  image->byte_order = byte_order;
  image->bit_order = bit_order;
  xcb_image_annotate(image);

  /*
   * Ways this function can be called:
   *   * with data: we fail if bytes isn't
   *     large enough, else leave well enough alone.
   *   * with base and !data: if bytes is zero, we
   *     default; otherwise we fail if bytes isn't
   *     large enough, else fill in data
   *   * with !base and !data: we malloc storage
   *     for the data, save that address as the base,
   *     and fail if malloc does.
   *
   * When successful, we establish the invariant that data
   * points at sufficient storage that may have been
   * supplied, and base is set iff it should be
   * auto-freed when the image is destroyed.
   * 
   * Except as a special case when base = 0 && data == 0 &&
   * bytes == ~0 we just return the image structure and let
   * the caller deal with getting the allocation right.
   */
  if (!base && !data && bytes == ~0) {
      image->base = 0;
      image->data = 0;
      return image;
  }
  if (!base && data && bytes == 0)
      bytes = image->size;
  image->base = base;
  image->data = data;
  if (!image->data) {
      if (image->base) {
	  image->data = image->base;
      } else {
	  bytes = image->size;
	  image->base = malloc(bytes);
	  image->data = image->base;
      }
  }
  if (!image->data || bytes < image->size) {
      free(image);
      return 0;
  }
  return image;
}


void
xcb_image_destroy (xcb_image_t *image)
{
  if (image->base)
      free (image->base);
  free (image);
}


xcb_image_t *
xcb_image_get (xcb_connection_t *  conn,
	       xcb_drawable_t      draw,
	       int16_t             x,
	       int16_t             y,
	       uint16_t            width,
	       uint16_t            height,
	       uint32_t            plane_mask,
	       xcb_image_format_t  format)
{
  xcb_get_image_cookie_t   image_cookie;
  xcb_get_image_reply_t *  imrep;
  xcb_image_t *            image = 0;
  uint32_t                 bytes;
  uint8_t *                data;

  image_cookie = xcb_get_image(conn, format, draw, x, y,
			       width, height, plane_mask);
  imrep = xcb_get_image_reply(conn, image_cookie, 0);
  if (!imrep)
      return 0;
  bytes = xcb_get_image_data_length(imrep);
  data = xcb_get_image_data(imrep);
  switch (format) {
  case XCB_IMAGE_FORMAT_XY_PIXMAP:
      plane_mask &= xcb_mask(imrep->depth);
      if (plane_mask != xcb_mask(imrep->depth)) {
	  xcb_image_t *  tmp_image =
	    xcb_image_create_native(conn, width, height, format,
				    imrep->depth, 0, 0, 0);
	  int            i;
	  uint32_t       rpm = plane_mask;
	  uint8_t *      src_plane = image->data;
	  uint8_t *      dst_plane = tmp_image->data;
	  uint32_t       size = image->height * image->stride;
	  
	  if (!tmp_image) {
	      free(imrep);
	      return 0;
	  }
	  if (tmp_image->bit_order == XCB_IMAGE_ORDER_MSB_FIRST)
	      rpm = xcb_bit_reverse(plane_mask, imrep->depth);
	  for (i = 0; i < imrep->depth; i++) {
	      if (rpm & 1) {
		  memcpy(dst_plane, src_plane, size);
		  src_plane += size;
	      } else {
		  memset(dst_plane, 0, size);
	      }
	      dst_plane += size;
	  }
	  tmp_image->plane_mask = plane_mask;
	  image = tmp_image;
	  free(imrep);
	  break;
      }
      /* fall through */
  case XCB_IMAGE_FORMAT_Z_PIXMAP:
      image = xcb_image_create_native(conn, width, height, format,
				      imrep->depth, imrep, bytes, data);
      if (!image) {
	  free(imrep);
	  return 0;
      }
      break;
  default:
      assert(0);
  }
  assert(bytes == image->size);
  return image;
}


xcb_image_t *
xcb_image_native (xcb_connection_t *  c,
		  xcb_image_t *       image,
		  int                 convert)
{
  xcb_image_t *        tmp_image = 0;
  const xcb_setup_t *  setup = xcb_get_setup(c);
  xcb_format_t *       fmt = 0;
  xcb_image_format_t   ef = effective_format(image->format, image->bpp);
  uint8_t              bpp = 1;

  if (image->depth > 1 || ef == XCB_IMAGE_FORMAT_Z_PIXMAP) {
      fmt = find_format_by_depth(setup, image->depth);
      /* XXX For now, we don't do depth conversions, even
	 for xy-pixmaps */
      if (!fmt)
	  return 0;
      bpp = fmt->bits_per_pixel;
  }
  switch (ef) {
  case XCB_IMAGE_FORMAT_XY_PIXMAP:
      if (setup->bitmap_format_scanline_unit != image->unit ||
	  setup->bitmap_format_scanline_pad != image->scanline_pad ||
	  setup->image_byte_order != image->byte_order ||
	  setup->bitmap_format_bit_order != image->bit_order ||
	  bpp != image->bpp) {
	  if (!convert)
	      return 0;
	  tmp_image =
	      xcb_image_create(image->width, image->height, image->format,
			       setup->bitmap_format_scanline_pad,
			       image->depth, bpp,
			       setup->bitmap_format_scanline_unit,
			       setup->image_byte_order,
			       setup->bitmap_format_bit_order,
			       0, 0, 0);
	  if (!tmp_image)
	      return 0;
      }
      break;
  case XCB_IMAGE_FORMAT_Z_PIXMAP:
      if (fmt->scanline_pad != image->scanline_pad ||
	  setup->image_byte_order != image->byte_order ||
	  bpp != image->bpp) {
	  if (!convert)
	      return 0;
	  tmp_image =
	      xcb_image_create(image->width, image->height, image->format,
			       fmt->scanline_pad,
			       image->depth, bpp, 0,
			       setup->image_byte_order,
			       XCB_IMAGE_ORDER_MSB_FIRST,
			       0, 0, 0);
	  if (!tmp_image)
	      return 0;
      }
      break;
  default:
      assert(0);
  }
  if (tmp_image) {
      if (!xcb_image_convert(image, tmp_image)) {
	  xcb_image_destroy(tmp_image);
	  return 0;
      }
      image = tmp_image;
  }
  return image;
}


xcb_void_cookie_t
xcb_image_put (xcb_connection_t *  conn,
	       xcb_drawable_t      draw,
	       xcb_gcontext_t      gc,
	       xcb_image_t *       image,
	       int16_t             x,
	       int16_t             y,
	       uint8_t             left_pad)
{
  return xcb_put_image(conn, image->format, draw, gc,
		       image->width, image->height,
		       x, y, left_pad,
		       image->depth,
		       image->size,
		       image->data);
}



/*
 * Shm stuff
 */

xcb_image_t *
xcb_image_shm_put (xcb_connection_t *      conn,
		   xcb_drawable_t          draw,
		   xcb_gcontext_t          gc,
		   xcb_image_t *           image,
		   xcb_shm_segment_info_t  shminfo,
		   int16_t                 src_x,
		   int16_t                 src_y,
		   int16_t                 dest_x,
		   int16_t                 dest_y,
		   uint16_t                src_width,
		   uint16_t                src_height,
		   uint8_t                 send_event)
{
  if (!xcb_image_native(conn, image, 0))
      return 0;
  if (!shminfo.shmaddr)
      return 0;
  xcb_shm_put_image(conn, draw, gc,
		    image->width, image->height,
		    src_x, src_y, src_width, src_height,
		    dest_x, dest_y,
		    image->depth, image->format,
		    send_event, 
		    shminfo.shmseg,
		    image->data - shminfo.shmaddr);
  return image;
}


int
xcb_image_shm_get (xcb_connection_t *      conn,
		   xcb_drawable_t          draw,
		   xcb_image_t *           image,
		   xcb_shm_segment_info_t  shminfo,
		   int16_t                 x,
		   int16_t                 y,
		   uint32_t                plane_mask)
{
  xcb_shm_get_image_reply_t *  setup;
  xcb_shm_get_image_cookie_t   cookie;
  xcb_generic_error_t *        err = 0;

  if (!shminfo.shmaddr)
      return 0;
  cookie = xcb_shm_get_image(conn, draw,
			     x, y,
			     image->width, image->height,
			     plane_mask,
			     image->format,
			     shminfo.shmseg,
			     image->data - shminfo.shmaddr);
  setup = xcb_shm_get_image_reply(conn, cookie, &err);
  if (err) {
      fprintf(stderr, "ShmGetImageReply error %d\n", (int)err->error_code);
      free(err);
      return 0;
  } else {
      free (setup);
      return 1;
  }
}


static uint32_t
xy_image_byte (xcb_image_t *image, uint32_t x)
{
    x >>= 3;
    if (image->byte_order == image->bit_order)
	return x;
    switch (image->unit) {
    default:
    case 8:
	return x;
    case 16:
	return x ^ 1;
    case 32:
	return x ^ 3;
    }
}

static uint32_t
xy_image_bit (xcb_image_t *image, uint32_t x)
{
    x &= 7;
    if (image->bit_order == XCB_IMAGE_ORDER_MSB_FIRST)
	x = 7 - x;
    return x;
}

/* GetPixel/PutPixel */

/* XXX this is the most hideously done cut-and-paste
   to below.  Any bugs fixed there should be fixed here
   and vice versa. */
void
xcb_image_put_pixel (xcb_image_t *image,
		     uint32_t x,
		     uint32_t y,
		     uint32_t pixel)
{
  uint8_t *row;

  if (x > image->width || y > image->height)
      return;
  row = image->data + (y * image->stride);
  switch (effective_format(image->format, image->bpp)) {
  case XCB_IMAGE_FORMAT_XY_BITMAP:
  case XCB_IMAGE_FORMAT_XY_PIXMAP:
      /* block */ {
	  int  p;
	  uint32_t   plane_mask = image->plane_mask;
	  uint8_t *  plane = row;
	  uint32_t   byte = xy_image_byte(image, x);
	  uint32_t   bit = xy_image_bit(image,x);
	  uint8_t    mask = 1 << bit;

	  for (p = image->bpp - 1; p >= 0; p--) {
	      if ((plane_mask >> p) & 1) {
		  uint8_t *  bp = plane + byte;
		  uint8_t    this_bit = ((pixel >> p) & 1) << bit;
		  *bp = (*bp & ~mask) | this_bit;
	      }
	      plane += image->stride * image->height;
	  }
      }
      break;
  case XCB_IMAGE_FORMAT_Z_PIXMAP:
      switch (image->bpp) {
      uint32_t   mask;
      case 4:
	  mask = 0xf;
	  pixel &= 0xf;
	  if ((x & 1) ==
	      (image->byte_order == XCB_IMAGE_ORDER_MSB_FIRST)) {
	      pixel <<= 4;
	      mask <<= 4;
	  }
	  row[x >> 1] = (row[x >> 1] & ~mask) | pixel;
	  break;
      case 8:
	  row[x] = pixel;
	  break;
      case 16:
	  switch (image->byte_order) {
	  case XCB_IMAGE_ORDER_LSB_FIRST:
	      row[x << 1] = pixel;
	      row[(x << 1) + 1] = pixel >> 8;
	      break;
	  case XCB_IMAGE_ORDER_MSB_FIRST:
	      row[x << 1] = pixel >> 8;
	      row[(x << 1) + 1] = pixel;
	      break;
	  }
	  break;
      case 24:
	  switch (image->byte_order) {
	  case XCB_IMAGE_ORDER_LSB_FIRST:
	      row[x * 3] = pixel;
	      row[x * 3 + 1] = pixel >> 8;
	      row[x * 3 + 2] = pixel >> 16;
	      break;
	  case XCB_IMAGE_ORDER_MSB_FIRST:
	      row[x * 3] = pixel >> 16;
	      row[x * 3 + 1] = pixel >> 8;
	      row[x * 3 + 2] = pixel;
	      break;
	  }
	  break;
      case 32:
	  switch (image->byte_order) {
	  case XCB_IMAGE_ORDER_LSB_FIRST:
	      row[x << 2] = pixel;
	      row[(x << 2) + 1] = pixel >> 8;
	      row[(x << 2) + 2] = pixel >> 16;
	      row[(x << 2) + 3] = pixel >> 24;
	      break;
	  case XCB_IMAGE_ORDER_MSB_FIRST:
	      row[x << 2] = pixel >> 24;
	      row[(x << 2) + 1] = pixel >> 16;
	      row[(x << 2) + 2] = pixel >> 8;
	      row[(x << 2) + 3] = pixel;
	      break;
	  }
	  break;
      default:
	  assert(0);
      }
      break;
  default:
      assert(0);
  }
}


/* XXX this is the most hideously done cut-and-paste
   from above.  Any bugs fixed there should be fixed here
   and vice versa. */
uint32_t
xcb_image_get_pixel (xcb_image_t *image,
		     uint32_t x,
		     uint32_t y)
{
  uint32_t pixel = 0;
  uint8_t *row;

  assert(x < image->width && y < image->height);
  row = image->data + (y * image->stride);
  switch (effective_format(image->format, image->bpp)) {
  case XCB_IMAGE_FORMAT_XY_BITMAP:
  case XCB_IMAGE_FORMAT_XY_PIXMAP:
      /* block */ {
	  int  p;
	  uint32_t   plane_mask = image->plane_mask;
	  uint8_t *  plane = row;
	  uint32_t   byte = xy_image_byte(image, x);
	  uint32_t   bit = xy_image_bit(image,x);

	  for (p = image->bpp - 1; p >= 0; p--) {
	      pixel <<= 1;
	      if ((plane_mask >> p) & 1) {
		  uint8_t *  bp = plane + byte;
		  pixel |= (*bp >> bit) & 1;
	      }
	      plane += image->stride * image->height;
	  }
      }
      return pixel;
  case XCB_IMAGE_FORMAT_Z_PIXMAP:
      switch (image->bpp) {
      case 4:
	  if ((x & 1) == (image->byte_order == XCB_IMAGE_ORDER_MSB_FIRST))
	      return row[x >> 1] >> 4;
	  return row[x >> 1] & 0xf;
      case 8:
	  return row[x];
      case 16:
	  switch (image->byte_order) {
	  case XCB_IMAGE_ORDER_LSB_FIRST:
	      pixel = row[x << 1];
	      pixel |= row[(x << 1) + 1] << 8;
	      break;
	  case XCB_IMAGE_ORDER_MSB_FIRST:
	      pixel = row[x << 1] << 8;
	      pixel |= row[(x << 1) + 1];
	      break;
	  }
	  break;
      case 24:
	  switch (image->byte_order) {
	  case XCB_IMAGE_ORDER_LSB_FIRST:
	      pixel = row[x * 3];
	      pixel |= row[x * 3 + 1] << 8;
	      pixel |= row[x * 3 + 2] << 16;
	      break;
	  case XCB_IMAGE_ORDER_MSB_FIRST:
	      pixel = row[x * 3] << 16;
	      pixel |= row[x * 3 + 1] << 8;
	      pixel |= row[x * 3 + 2];
	      break;
	  }
	  break;
      case 32:
	  switch (image->byte_order) {
	  case XCB_IMAGE_ORDER_LSB_FIRST:
	      pixel = row[x << 2];
	      pixel |= row[(x << 2) + 1] << 8;
	      pixel |= row[(x << 2) + 2] << 16;
	      pixel |= row[(x << 2) + 3] << 24;
	      break;
	  case XCB_IMAGE_ORDER_MSB_FIRST:
	      pixel = row[x << 2] << 24;
	      pixel |= row[(x << 2) + 1] << 16;
	      pixel |= row[(x << 2) + 2] << 8;
	      pixel |= row[(x << 2) + 3];
	      break;
	  }
	  break;
      default:
	  assert(0);
      }
      return pixel;
  default:
      assert(0);
  }
}


xcb_image_t *
xcb_image_create_from_bitmap_data (uint8_t *           data,
				   uint32_t            width,
				   uint32_t            height)
{
  return xcb_image_create(width, height, XCB_IMAGE_FORMAT_XY_PIXMAP,
			  8, 1, 1, 8,
			  XCB_IMAGE_ORDER_LSB_FIRST,
			  XCB_IMAGE_ORDER_LSB_FIRST,
			  0, 0, data);
}


/*
 * (Adapted from libX11.)
 *
 * xcb_create_pixmap_from_bitmap_data: Routine to make a pixmap of
 *      given depth from user supplied bitmap data.
 *	D is any drawable on the same screen that the pixmap will be used in.
 *	Data is a pointer to the bit data, and 
 *	width & height give the size in bits of the pixmap.
 *
 * The following format is assumed for data:
 *
 *    format=XY (will use XYPixmap for depth 1 and XYBitmap for larger)
 *    bit_order=LSBFirst
 *    padding=8
 *    bitmap_unit=8
 */  
xcb_pixmap_t
xcb_create_pixmap_from_bitmap_data (xcb_connection_t *  display,
				    xcb_drawable_t      d,
				    uint8_t *           data,
				    uint32_t            width,
				    uint32_t            height,
				    uint32_t            depth,
				    uint32_t            fg,
				    uint32_t            bg,
				    xcb_gcontext_t *    gcp)
{
  xcb_pixmap_t        pix;
  xcb_image_t *       image;
  xcb_image_t *       final_image;
  xcb_gcontext_t gc;
  uint32_t mask = 0;
  xcb_params_gc_t gcv;

  image = xcb_image_create_from_bitmap_data(data, width, height);
  if (!image)
      return 0;
  if (depth > 1)
      image->format = XCB_IMAGE_FORMAT_XY_BITMAP;
  final_image = xcb_image_native(display, image, 1);
  if (!final_image) {
      xcb_image_destroy(image);
      return 0;
  }
  pix = xcb_generate_id(display);
  xcb_create_pixmap(display, depth, pix, d, width, height);
  gc = xcb_generate_id(display);
  XCB_AUX_ADD_PARAM(&mask, &gcv, foreground, fg);
  XCB_AUX_ADD_PARAM(&mask, &gcv, background, bg);
  xcb_aux_create_gc(display, gc, pix, mask, &gcv);
  xcb_image_put(display, pix, gc, final_image, 0, 0, 0);
  if (final_image != image)
      xcb_image_destroy(final_image);
  xcb_image_destroy(image);
  if (gcp)
      *gcp = gc;
  else
      xcb_free_gc(display, gc);
  return pix;
}


/* Thanks to Keith Packard <keithp@keithp.com> for this code */
static void 
swap_image(uint8_t *	     src,
           uint32_t 	     src_stride,
	   uint8_t *	     dst,
	   uint32_t 	     dst_stride,
	   uint32_t 	     height,
	   uint32_t	     byteswap,
	   int		     bitswap,
	   int               nibbleswap)
{
  while (height--) {
      uint32_t    s;

      for (s = 0; s < src_stride; s++) {
	  uint8_t   b;
	  uint32_t  d = s ^ byteswap;

	  if (d > dst_stride)
	      continue;

	  b = src[s];
	  if (bitswap)
	      b = xcb_bit_reverse(b, 8);
	  if (nibbleswap)
	      b = (b << 4) | (b >> 4);
	  dst[d] = b;
      }
      src += src_stride;
      dst += dst_stride;
  }
}

/* Which order are bytes in (low two bits), given
 * code which accesses an image one byte at a time
 */
static uint32_t
byte_order(xcb_image_t *i)
{
    uint32_t flip = i->byte_order == XCB_IMAGE_ORDER_MSB_FIRST;

    switch (i->bpp) {
    default:
    case 8:
	return 0;
    case 16:
	return flip;
    case 32:
	return flip | (flip << 1);
    }
}

static uint32_t
bit_order(xcb_image_t *i)
{
    uint32_t flip = i->byte_order != i->bit_order;

    switch (i->unit) {
    default:
    case 8:
	return 0;
    case 16:
	return flip;
    case 32:
	return flip | (flip << 1);
    }
}

/* Convert from one byte order to another by flipping the 
 * low two bits of the byte index along a scanline
 */
static uint32_t 
conversion_byte_swap(xcb_image_t *src, xcb_image_t *dst)
{
    xcb_image_format_t ef = effective_format(src->format, src->bpp);
    
    /* src_ef == dst_ef in all callers of this function */
    if (ef == XCB_IMAGE_FORMAT_XY_PIXMAP) {
	return bit_order(src) ^ bit_order(dst);
    } else {
	/* src_bpp == dst_bpp in all callers of this function */
	return byte_order(src) ^ byte_order(dst);
    }
}

xcb_image_t *
xcb_image_convert (xcb_image_t *  src,
		   xcb_image_t *  dst)
{
  xcb_image_format_t  ef = effective_format(src->format, src->bpp);

  /* Things will go horribly wrong here if a bad
     image is passed in, so we check some things
     up front just to be nice. */
  assert(image_format_valid(src));
  assert(image_format_valid(dst));
  
  /* images must be the same size
   * (yes, we could copy a sub-set)
   */
  if (src->width != dst->width ||
      src->height != dst->height)
      return 0;

  if (ef == effective_format(dst->format, dst->bpp) &&
      src->bpp == dst->bpp)
  {
    if (src->unit == dst->unit &&
	src->scanline_pad == dst->scanline_pad &&
	src->byte_order == dst->byte_order &&
	(ef == XCB_IMAGE_FORMAT_Z_PIXMAP ||
	 src->bit_order == dst->bit_order)) {
      memcpy(dst->data, src->data, src->size);
    } else {
      int	bitswap = 0;
      int	nibbleswap = 0;
      uint32_t	byteswap = conversion_byte_swap(src, dst);
      uint32_t	height = src->height;;

      if (ef == XCB_IMAGE_FORMAT_Z_PIXMAP) {
	if (src->bpp == 4 && src->byte_order != dst->byte_order)
	  nibbleswap = 1;
      } else {
	if (src->bit_order != dst->bit_order)
	  bitswap = 1;
	height *= src->depth;
      }
      swap_image (src->data, src->stride, dst->data, dst->stride,
		  height, byteswap, bitswap, nibbleswap);
    }
  }
  else
  {
    uint32_t            x;
    uint32_t            y;
    /* General case: Slow pixel copy. Should we optimize
       Z24<->Z32 copies of either endianness? */
    for (y = 0; y < src->height; y++) {
	for (x = 0; x < src->width; x++) {
	    uint32_t  pixel = xcb_image_get_pixel(src, x, y);
	    xcb_image_put_pixel(dst, x, y, pixel);
	}
    }
  }
  return dst;
}

xcb_image_t *
xcb_image_subimage(xcb_image_t *  image,
		   uint32_t       x,
		   uint32_t       y,
		   uint32_t       width,
		   uint32_t       height,
		   void *         base,
		   uint32_t       bytes,
		   uint8_t *      data)
{
    int                 i, j;
    xcb_image_t *       result;
    
    if (x + width > image->width)
	return 0;
    if (y + height > image->height)
	return 0;
    result = xcb_image_create(width, height, image->format,
			      image->scanline_pad, image->depth,
			      image->bpp, image->unit, image->byte_order,
			      image->bit_order,
			      base, bytes, data);
    if (!result)
	return 0;
    /* XXX FIXME  For now, lose on performance. Sorry. */
    for (j = 0; j < height; j++) {
	for (i = 0; i < width; i++) {
	    uint32_t pixel = xcb_image_get_pixel(image, x + i, y + j);
	    xcb_image_put_pixel(result, i, j, pixel);
	}
    }
    return result;
}