aboutsummaryrefslogtreecommitdiff
path: root/src/libmemdraw/drawtest.c
blob: 07cda45df25f888ad028fb8ad0fc09c0b11c47cf (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
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <draw.h>
#include <memdraw.h>

#define DBG if(0)
#define RGB2K(r,g,b)	((299*((u32int)(r))+587*((u32int)(g))+114*((u32int)(b)))/1000)

/*
 * This program tests the 'memimagedraw' primitive stochastically.
 * It tests the combination aspects of it thoroughly, but since the
 * three images it uses are disjoint, it makes no check of the
 * correct behavior when images overlap.  That is, however, much
 * easier to get right and to test.
 */

void	drawonepixel(Memimage*, Point, Memimage*, Point, Memimage*, Point);
void	verifyone(void);
void	verifyline(void);
void	verifyrect(void);
void	verifyrectrepl(int, int);
void putpixel(Memimage *img, Point pt, u32int nv);
u32int rgbatopix(uchar, uchar, uchar, uchar);

char *dchan, *schan, *mchan;
int dbpp, sbpp, mbpp;

int drawdebug=0;
int	seed;
int	niters = 100;
int	dbpp;	/* bits per pixel in destination */
int	sbpp;	/* bits per pixel in src */
int	mbpp;	/* bits per pixel in mask */
int	dpm;	/* pixel mask at high part of byte, in destination */
int	nbytes;	/* in destination */

int	Xrange	= 64;
int	Yrange	= 8;

Memimage	*dst;
Memimage	*src;
Memimage	*mask;
Memimage	*stmp;
Memimage	*mtmp;
Memimage	*ones;
uchar	*dstbits;
uchar	*srcbits;
uchar	*maskbits;
u32int	*savedstbits;

void
rdb(void)
{
}

int
iprint(char *fmt, ...)
{
	int n;	
	va_list va;
	char buf[1024];

	va_start(va, fmt);
	n = vseprint(buf, buf+sizeof buf, fmt, va) - buf;
	va_end(va);

	write(1,buf,n);
	return 1;
}

void
main(int argc, char *argv[])
{
	memimageinit();
	seed = time(0);

	ARGBEGIN{
	case 'x':
		Xrange = atoi(ARGF());
		break;
	case 'y':
		Yrange = atoi(ARGF());
		break;
	case 'n':
		niters = atoi(ARGF());
		break;
	case 's':
		seed = atoi(ARGF());
		break;
	}ARGEND

	dchan = "r8g8b8";
	schan = "r8g8b8";
	mchan = "r8g8b8";
	switch(argc){
	case 3:	mchan = argv[2];
	case 2:	schan = argv[1];
	case 1:	dchan = argv[0];
	case 0:	break;
	default:	goto Usage;
	Usage:
		fprint(2, "usage: dtest [dchan [schan [mchan]]]\n");
		exits("usage");
	}

	fprint(2, "%s -x %d -y %d -s 0x%x %s %s %s\n", argv0, Xrange, Yrange, seed, dchan, schan, mchan);
	srand(seed);

	dst = allocmemimage(Rect(0, 0, Xrange, Yrange), strtochan(dchan));
	src = allocmemimage(Rect(0, 0, Xrange, Yrange), strtochan(schan));
	mask = allocmemimage(Rect(0, 0, Xrange, Yrange), strtochan(mchan));
	stmp = allocmemimage(Rect(0, 0, Xrange, Yrange), strtochan(schan));
	mtmp = allocmemimage(Rect(0, 0, Xrange, Yrange), strtochan(mchan));
	ones = allocmemimage(Rect(0, 0, Xrange, Yrange), strtochan(mchan));
/*	print("chan %lux %lux %lux %lux %lux %lux\n", dst->chan, src->chan, mask->chan, stmp->chan, mtmp->chan, ones->chan); */
	if(dst==0 || src==0 || mask==0 || mtmp==0 || ones==0) {
	Alloc:
		fprint(2, "dtest: allocation failed: %r\n");
		exits("alloc");
	}
	nbytes = (4*Xrange+4)*Yrange;
	srcbits = malloc(nbytes);
	dstbits = malloc(nbytes);
	maskbits = malloc(nbytes);
	savedstbits = malloc(nbytes);
	if(dstbits==0 || srcbits==0 || maskbits==0 || savedstbits==0)
		goto Alloc;
	dbpp = dst->depth;
	sbpp = src->depth;
	mbpp = mask->depth;
	dpm = 0xFF ^ (0xFF>>dbpp);
	memset(ones->data->bdata, 0xFF, ones->width*sizeof(u32int)*Yrange);


	fprint(2, "dtest: verify single pixel operation\n");
	verifyone();

	fprint(2, "dtest: verify full line non-replicated\n");
	verifyline();

	fprint(2, "dtest: verify full rectangle non-replicated\n");
	verifyrect();

	fprint(2, "dtest: verify full rectangle source replicated\n");
	verifyrectrepl(1, 0);

	fprint(2, "dtest: verify full rectangle mask replicated\n");
	verifyrectrepl(0, 1);

	fprint(2, "dtest: verify full rectangle source and mask replicated\n");
	verifyrectrepl(1, 1);

	exits(0);
}

/*
 * Dump out an ASCII representation of an image.  The label specifies
 * a list of characters to put at various points in the picture.
 */
static void
Bprintr5g6b5(Biobuf *bio, char* _, u32int v)
{
	int r,g,b;
	r = (v>>11)&31;
	g = (v>>5)&63;
	b = v&31;
	Bprint(bio, "%.2x%.2x%.2x", r,g,b);
}

static void
Bprintr5g5b5a1(Biobuf *bio, char* _, u32int v)
{
	int r,g,b,a;
	r = (v>>11)&31;
	g = (v>>6)&31;
	b = (v>>1)&31;
	a = v&1;
	Bprint(bio, "%.2x%.2x%.2x%.2x", r,g,b,a);
}

void
dumpimage(char *name, Memimage *img, void *vdata, Point labelpt)
{
	Biobuf b;
	uchar *data;
	uchar *p;
	char *arg;
	void (*fmt)(Biobuf*, char*, u32int);
	int npr, x, y, nb, bpp;
	u32int v, mask;
	Rectangle r;

	fmt = nil;
	arg = nil;
	switch(img->depth){
	case 1:
	case 2:
	case 4:
		fmt = (void(*)(Biobuf*,char*,u32int))Bprint;
		arg = "%.1ux";
		break;
	case 8:
		fmt = (void(*)(Biobuf*,char*,u32int))Bprint;
		arg = "%.2ux";
		break;
	case 16:
		arg = nil;
		if(img->chan == RGB16)
			fmt = Bprintr5g6b5;
		else{
			fmt = (void(*)(Biobuf*,char*,u32int))Bprint;
			arg = "%.4ux";
		}
		break;
	case 24:
		fmt = (void(*)(Biobuf*,char*,u32int))Bprint;
		arg = "%.6lux";
		break;
	case 32:
		fmt = (void(*)(Biobuf*,char*,u32int))Bprint;
		arg = "%.8lux";
		break;
	}
	if(fmt == nil){
		fprint(2, "bad format\n");
		abort();
	}

	r  = img->r;
	Binit(&b, 2, OWRITE);
	data = vdata;
	bpp = img->depth;
	Bprint(&b, "%s\t%d\tr %R clipr %R repl %d data %p *%P\n", name, r.min.x, r, img->clipr, (img->flags&Frepl) ? 1 : 0, vdata, labelpt);
	mask = (1ULL<<bpp)-1;
/*	for(y=r.min.y; y<r.max.y; y++){ */
	for(y=0; y<Yrange; y++){
		nb = 0;
		v = 0;
		p = data+(byteaddr(img, Pt(0,y))-(uchar*)img->data->bdata);
		Bprint(&b, "%-4d\t", y);
/*		for(x=r.min.x; x<r.max.x; x++){ */
		for(x=0; x<Xrange; x++){
			if(x==0)
				Bprint(&b, "\t");

			if(x != 0 && (x%8)==0)
				Bprint(&b, " ");

			npr = 0;
			if(x==labelpt.x && y==labelpt.y){
				Bprint(&b, "*");
				npr++;
			}
			if(npr == 0)
				Bprint(&b, " ");

			while(nb < bpp){
				v &= (1<<nb)-1;
				v |= (u32int)(*p++) << nb;
				nb += 8;
			}
			nb -= bpp;
/*			print("bpp %d v %.8lux mask %.8lux nb %d\n", bpp, v, mask, nb); */
			fmt(&b, arg, (v>>nb)&mask);
		}
		Bprint(&b, "\n");
	}
	Bterm(&b);
}

/*
 * Verify that the destination pixel has the specified value.
 * The value is in the high bits of v, suitably masked, but must
 * be extracted from the destination Memimage.
 */
void
checkone(Point p, Point sp, Point mp)
{
	int delta;
	uchar *dp, *sdp;

	delta = (uchar*)byteaddr(dst, p)-(uchar*)dst->data->bdata;
	dp = (uchar*)dst->data->bdata+delta;
	sdp = (uchar*)savedstbits+delta;

	if(memcmp(dp, sdp, (dst->depth+7)/8) != 0) {
		fprint(2, "dtest: one bad pixel drawing at dst %P from source %P mask %P\n", p, sp, mp);
		fprint(2, " %.2ux %.2ux %.2ux %.2ux should be %.2ux %.2ux %.2ux %.2ux\n",
			dp[0], dp[1], dp[2], dp[3], sdp[0], sdp[1], sdp[2], sdp[3]);
		fprint(2, "addresses dst %p src %p mask %p\n", dp, byteaddr(src, sp), byteaddr(mask, mp));
		dumpimage("src", src, src->data->bdata, sp);
		dumpimage("mask", mask, mask->data->bdata, mp);
		dumpimage("origdst", dst, dstbits, p);
		dumpimage("dst", dst, dst->data->bdata, p);
		dumpimage("gooddst", dst, savedstbits, p);
		abort();
	}
}

/*
 * Verify that the destination line has the same value as the saved line.
 */
#define RECTPTS(r) (r).min.x, (r).min.y, (r).max.x, (r).max.y
void
checkline(Rectangle r, Point sp, Point mp, int y, Memimage *stmp, Memimage *mtmp)
{
	u32int *dp;
	int nb;
	u32int *saved;

	dp = wordaddr(dst, Pt(0, y));
	saved = savedstbits + y*dst->width;
	if(dst->depth < 8)
		nb = Xrange/(8/dst->depth);
	else
		nb = Xrange*(dst->depth/8);
	if(memcmp(dp, saved, nb) != 0){
		fprint(2, "dtest: bad line at y=%d; saved %p dp %p\n", y, saved, dp);
		fprint(2, "draw dst %R src %P mask %P\n", r, sp, mp);
		dumpimage("src", src, src->data->bdata, sp);
		if(stmp) dumpimage("stmp", stmp, stmp->data->bdata, sp);
		dumpimage("mask", mask, mask->data->bdata, mp);
		if(mtmp) dumpimage("mtmp", mtmp, mtmp->data->bdata, mp);
		dumpimage("origdst", dst, dstbits, r.min);
		dumpimage("dst", dst, dst->data->bdata, r.min);
		dumpimage("gooddst", dst, savedstbits, r.min);
		abort();
	}
}

/*
 * Fill the bits of an image with random data.
 * The Memimage parameter is used only to make sure
 * the data is well formatted: only ucbits is written.
 */
void
fill(Memimage *img, uchar *ucbits)
{
	int i, x, y;
	ushort *up;
	uchar alpha, r, g, b;
	void *data;

	if((img->flags&Falpha) == 0){
		up = (ushort*)ucbits;
		for(i=0; i<nbytes/2; i++)
			*up++ = lrand() >> 7;
		if(i+i != nbytes)
			*(uchar*)up = lrand() >> 7;
	}else{
		data = img->data->bdata;
		img->data->bdata = ucbits;

		for(x=img->r.min.x; x<img->r.max.x; x++)
		for(y=img->r.min.y; y<img->r.max.y; y++){
			alpha = rand() >> 4;
			r = rand()%(alpha+1);
			g = rand()%(alpha+1);
			b = rand()%(alpha+1);
			putpixel(img, Pt(x,y), rgbatopix(r,g,b,alpha));
		}
		img->data->bdata = data;
	}
		
}

/*
 * Mask is preset; do the rest
 */
void
verifyonemask(void)
{
	Point dp, sp, mp;

	fill(dst, dstbits);
	fill(src, srcbits);
	memmove(dst->data->bdata, dstbits, dst->width*sizeof(u32int)*Yrange);
	memmove(src->data->bdata, srcbits, src->width*sizeof(u32int)*Yrange);
	memmove(mask->data->bdata, maskbits, mask->width*sizeof(u32int)*Yrange);

	dp.x = nrand(Xrange);
	dp.y = nrand(Yrange);

	sp.x = nrand(Xrange);
	sp.y = nrand(Yrange);

	mp.x = nrand(Xrange);
	mp.y = nrand(Yrange);

	drawonepixel(dst, dp, src, sp, mask, mp);
	memmove(mask->data->bdata, maskbits, mask->width*sizeof(u32int)*Yrange);
	memmove(savedstbits, dst->data->bdata, dst->width*sizeof(u32int)*Yrange);
	
	memmove(dst->data->bdata, dstbits, dst->width*sizeof(u32int)*Yrange);
	memimagedraw(dst, Rect(dp.x, dp.y, dp.x+1, dp.y+1), src, sp, mask, mp, SoverD);
	memmove(mask->data->bdata, maskbits, mask->width*sizeof(u32int)*Yrange);

	checkone(dp, sp, mp);
}

void
verifyone(void)
{
	int i;

	/* mask all zeros */
	memset(maskbits, 0, nbytes);
	for(i=0; i<niters; i++)
		verifyonemask();

	/* mask all ones */
	memset(maskbits, 0xFF, nbytes);
	for(i=0; i<niters; i++)
		verifyonemask();

	/* random mask */
	for(i=0; i<niters; i++){
		fill(mask, maskbits);
		verifyonemask();
	}
}

/*
 * Mask is preset; do the rest
 */
void
verifylinemask(void)
{
	Point sp, mp, tp, up;
	Rectangle dr;
	int x;

	fill(dst, dstbits);
	fill(src, srcbits);
	memmove(dst->data->bdata, dstbits, dst->width*sizeof(u32int)*Yrange);
	memmove(src->data->bdata, srcbits, src->width*sizeof(u32int)*Yrange);
	memmove(mask->data->bdata, maskbits, mask->width*sizeof(u32int)*Yrange);

	dr.min.x = nrand(Xrange-1);
	dr.min.y = nrand(Yrange-1);
	dr.max.x = dr.min.x + 1 + nrand(Xrange-1-dr.min.x);
	dr.max.y = dr.min.y + 1;

	sp.x = nrand(Xrange);
	sp.y = nrand(Yrange);

	mp.x = nrand(Xrange);
	mp.y = nrand(Yrange);

	tp = sp;
	up = mp;
	for(x=dr.min.x; x<dr.max.x && tp.x<Xrange && up.x<Xrange; x++,tp.x++,up.x++)
		memimagedraw(dst, Rect(x, dr.min.y, x+1, dr.min.y+1), src, tp, mask, up, SoverD);
	memmove(savedstbits, dst->data->bdata, dst->width*sizeof(u32int)*Yrange);

	memmove(dst->data->bdata, dstbits, dst->width*sizeof(u32int)*Yrange);

	memimagedraw(dst, dr, src, sp, mask, mp, SoverD);
	checkline(dr, drawrepl(src->r, sp), drawrepl(mask->r, mp), dr.min.y, nil, nil);
}

void
verifyline(void)
{
	int i;

	/* mask all ones */
	memset(maskbits, 0xFF, nbytes);
	for(i=0; i<niters; i++)
		verifylinemask();

	/* mask all zeros */
	memset(maskbits, 0, nbytes);
	for(i=0; i<niters; i++)
		verifylinemask();

	/* random mask */
	for(i=0; i<niters; i++){
		fill(mask, maskbits);
		verifylinemask();
	}
}

/*
 * Mask is preset; do the rest
 */
void
verifyrectmask(void)
{
	Point sp, mp, tp, up;
	Rectangle dr;
	int x, y;

	fill(dst, dstbits);
	fill(src, srcbits);
	memmove(dst->data->bdata, dstbits, dst->width*sizeof(u32int)*Yrange);
	memmove(src->data->bdata, srcbits, src->width*sizeof(u32int)*Yrange);
	memmove(mask->data->bdata, maskbits, mask->width*sizeof(u32int)*Yrange);

	dr.min.x = nrand(Xrange-1);
	dr.min.y = nrand(Yrange-1);
	dr.max.x = dr.min.x + 1 + nrand(Xrange-1-dr.min.x);
	dr.max.y = dr.min.y + 1 + nrand(Yrange-1-dr.min.y);

	sp.x = nrand(Xrange);
	sp.y = nrand(Yrange);

	mp.x = nrand(Xrange);
	mp.y = nrand(Yrange);

	tp = sp;
	up = mp;
	for(y=dr.min.y; y<dr.max.y && tp.y<Yrange && up.y<Yrange; y++,tp.y++,up.y++){
		for(x=dr.min.x; x<dr.max.x && tp.x<Xrange && up.x<Xrange; x++,tp.x++,up.x++)
			memimagedraw(dst, Rect(x, y, x+1, y+1), src, tp, mask, up, SoverD);
		tp.x = sp.x;
		up.x = mp.x;
	}
	memmove(savedstbits, dst->data->bdata, dst->width*sizeof(u32int)*Yrange);

	memmove(dst->data->bdata, dstbits, dst->width*sizeof(u32int)*Yrange);

	memimagedraw(dst, dr, src, sp, mask, mp, SoverD);
	for(y=0; y<Yrange; y++)
		checkline(dr, drawrepl(src->r, sp), drawrepl(mask->r, mp), y, nil, nil);
}

void
verifyrect(void)
{
	int i;

	/* mask all zeros */
	memset(maskbits, 0, nbytes);
	for(i=0; i<niters; i++)
		verifyrectmask();

	/* mask all ones */
	memset(maskbits, 0xFF, nbytes);
	for(i=0; i<niters; i++)
		verifyrectmask();

	/* random mask */
	for(i=0; i<niters; i++){
		fill(mask, maskbits);
		verifyrectmask();
	}
}

Rectangle
randrect(void)
{
	Rectangle r;

	r.min.x = nrand(Xrange-1);
	r.min.y = nrand(Yrange-1);
	r.max.x = r.min.x + 1 + nrand(Xrange-1-r.min.x);
	r.max.y = r.min.y + 1 + nrand(Yrange-1-r.min.y);
	return r;
}

/*
 * Return coordinate corresponding to x withing range [minx, maxx)
 */
int
tilexy(int minx, int maxx, int x)
{
	int sx;

	sx = (x-minx) % (maxx-minx);
	if(sx < 0)
		sx += maxx-minx;
	return sx+minx;
}

void
replicate(Memimage *i, Memimage *tmp)
{
	Rectangle r, r1;
	int x, y, nb;

	/* choose the replication window (i->r) */
	r.min.x = nrand(Xrange-1);
	r.min.y = nrand(Yrange-1);
	/* make it trivial more often than pure chance allows */
	switch(lrand()&0){
	case 1:
		r.max.x = r.min.x + 2;
		r.max.y = r.min.y + 2;
		if(r.max.x < Xrange && r.max.y < Yrange)
			break;
		/* fall through */
	case 0:
		r.max.x = r.min.x + 1;
		r.max.y = r.min.y + 1;
		break;
	default:
		if(r.min.x+3 >= Xrange)
			r.max.x = Xrange;
		else
			r.max.x = r.min.x+3 + nrand(Xrange-(r.min.x+3));

		if(r.min.y+3 >= Yrange)
			r.max.y = Yrange;
		else
			r.max.y = r.min.y+3 + nrand(Yrange-(r.min.y+3));
	}
	assert(r.min.x >= 0);	
	assert(r.max.x <= Xrange);
	assert(r.min.y >= 0);
	assert(r.max.y <= Yrange);
	/* copy from i to tmp so we have just the replicated bits */
	nb = tmp->width*sizeof(u32int)*Yrange;
	memset(tmp->data->bdata, 0, nb);
	memimagedraw(tmp, r, i, r.min, ones, r.min, SoverD);
	memmove(i->data->bdata, tmp->data->bdata, nb);
	/* i is now a non-replicated instance of the replication */
	/* replicate it by hand through tmp */
	memset(tmp->data->bdata, 0, nb);
	x = -(tilexy(r.min.x, r.max.x, 0)-r.min.x);
	for(; x<Xrange; x+=Dx(r)){
		y = -(tilexy(r.min.y, r.max.y, 0)-r.min.y);
		for(; y<Yrange; y+=Dy(r)){
			/* set r1 to instance of tile by translation */
			r1.min.x = x;
			r1.min.y = y;
			r1.max.x = r1.min.x+Dx(r);
			r1.max.y = r1.min.y+Dy(r);
			memimagedraw(tmp, r1, i, r.min, ones, r.min, SoverD);
		}
	}
	i->flags |= Frepl;
	i->r = r;
	i->clipr = randrect();
/*	fprint(2, "replicate [[%d %d] [%d %d]] [[%d %d][%d %d]]\n", r.min.x, r.min.y, r.max.x, r.max.y, */
/*		i->clipr.min.x, i->clipr.min.y, i->clipr.max.x, i->clipr.max.y); */
	tmp->clipr = i->clipr;
}

/*
 * Mask is preset; do the rest
 */
void
verifyrectmaskrepl(int srcrepl, int maskrepl)
{
	Point sp, mp, tp, up;
	Rectangle dr;
	int x, y;
	Memimage *s, *m;

/*	print("verfrect %d %d\n", srcrepl, maskrepl); */
	src->flags &= ~Frepl;
	src->r = Rect(0, 0, Xrange, Yrange);
	src->clipr = src->r;
	stmp->flags &= ~Frepl;
	stmp->r = Rect(0, 0, Xrange, Yrange);
	stmp->clipr = src->r;
	mask->flags &= ~Frepl;
	mask->r = Rect(0, 0, Xrange, Yrange);
	mask->clipr = mask->r;
	mtmp->flags &= ~Frepl;
	mtmp->r = Rect(0, 0, Xrange, Yrange);
	mtmp->clipr = mask->r;

	fill(dst, dstbits);
	fill(src, srcbits);

	memmove(dst->data->bdata, dstbits, dst->width*sizeof(u32int)*Yrange);
	memmove(src->data->bdata, srcbits, src->width*sizeof(u32int)*Yrange);
	memmove(mask->data->bdata, maskbits, mask->width*sizeof(u32int)*Yrange);

	if(srcrepl){
		replicate(src, stmp);
		s = stmp;
	}else
		s = src;
	if(maskrepl){
		replicate(mask, mtmp);
		m = mtmp;
	}else
		m = mask;

	dr = randrect();

	sp.x = nrand(Xrange);
	sp.y = nrand(Yrange);

	mp.x = nrand(Xrange);
	mp.y = nrand(Yrange);

DBG	print("smalldraws\n");
	for(tp.y=sp.y,up.y=mp.y,y=dr.min.y; y<dr.max.y && tp.y<Yrange && up.y<Yrange; y++,tp.y++,up.y++)
		for(tp.x=sp.x,up.x=mp.x,x=dr.min.x; x<dr.max.x && tp.x<Xrange && up.x<Xrange; x++,tp.x++,up.x++)
			memimagedraw(dst, Rect(x, y, x+1, y+1), s, tp, m, up, SoverD);
	memmove(savedstbits, dst->data->bdata, dst->width*sizeof(u32int)*Yrange);

	memmove(dst->data->bdata, dstbits, dst->width*sizeof(u32int)*Yrange);

DBG	print("bigdraw\n");
	memimagedraw(dst, dr, src, sp, mask, mp, SoverD);
	for(y=0; y<Yrange; y++)
		checkline(dr, drawrepl(src->r, sp), drawrepl(mask->r, mp), y, srcrepl?stmp:nil, maskrepl?mtmp:nil);
}

void
verifyrectrepl(int srcrepl, int maskrepl)
{
	int i;

	/* mask all ones */
	memset(maskbits, 0xFF, nbytes);
	for(i=0; i<niters; i++)
		verifyrectmaskrepl(srcrepl, maskrepl);

	/* mask all zeros */
	memset(maskbits, 0, nbytes);
	for(i=0; i<niters; i++)
		verifyrectmaskrepl(srcrepl, maskrepl);

	/* random mask */
	for(i=0; i<niters; i++){
		fill(mask, maskbits);
		verifyrectmaskrepl(srcrepl, maskrepl);
	}
}

/*
 * Trivial draw implementation.
 * Color values are passed around as u32ints containing ααRRGGBB
 */

/*
 * Convert v, which is nhave bits wide, into its nwant bits wide equivalent.
 * Replicates to widen the value, truncates to narrow it.
 */
u32int
replbits(u32int v, int nhave, int nwant)
{
	v &= (1<<nhave)-1;
	for(; nhave<nwant; nhave*=2)
		v |= v<<nhave;
	v >>= (nhave-nwant);
	return v & ((1<<nwant)-1);
}

/*
 * Decode a pixel into the uchar* values.
 */
void
pixtorgba(u32int v, uchar *r, uchar *g, uchar *b, uchar *a)
{
	*a = v>>24;
	*r = v>>16;
	*g = v>>8;
	*b = v;
}

/*
 * Convert uchar channels into u32int pixel.
 */
u32int
rgbatopix(uchar r, uchar g, uchar b, uchar a)
{
	return (a<<24)|(r<<16)|(g<<8)|b;
}

/*
 * Retrieve the pixel value at pt in the image.
 */
u32int
getpixel(Memimage *img, Point pt)
{
	uchar r, g, b, a, *p;
	int nbits, npack, bpp;
	u32int v, c, rbits, bits;

	r = g = b = 0;
	a = ~0;	/* default alpha is full */

	p = byteaddr(img, pt);
	v = p[0]|(p[1]<<8)|(p[2]<<16)|(p[3]<<24);
	bpp = img->depth;
	if(bpp<8){
		/*
		 * Sub-byte greyscale pixels.
		 *
		 * We want to throw away the top pt.x%npack pixels and then use the next bpp bits
		 * in the bottom byte of v.  This madness is due to having big endian bits
		 * but little endian bytes.
		 */
		npack = 8/bpp;
		v >>= 8 - bpp*(pt.x%npack+1);
		v &= (1<<bpp)-1;
		r = g = b = replbits(v, bpp, 8);
	}else{
		/*
		 * General case.  We need to parse the channel descriptor and do what it says.
		 * In all channels but the color map, we replicate to 8 bits because that's the
		 * precision that all calculations are done at.
		 *
		 * In the case of the color map, we leave the bits alone, in case a color map
		 * with less than 8 bits of index is used.  This is currently disallowed, so it's
		 * sort of silly.
		 */

		for(c=img->chan; c; c>>=8){
			nbits = NBITS(c);
			bits = v & ((1<<nbits)-1);
			rbits = replbits(bits, nbits, 8);
			v >>= nbits;
			switch(TYPE(c)){
			case CRed:
				r = rbits;
				break;
			case CGreen:
				g = rbits;
				break;
			case CBlue:
				b = rbits;
				break;
			case CGrey:
				r = g = b = rbits;
				break;
			case CAlpha:
				a = rbits;
				break;
			case CMap:
				p = img->cmap->cmap2rgb + 3*bits;
				r = p[0];
				g = p[1];
				b = p[2];
				break;
			case CIgnore:
				break;
			default:
				fprint(2, "unknown channel type %lud\n", TYPE(c));
				abort();
			}
		}
	}
	return rgbatopix(r, g, b, a);
}

/*
 * Return the greyscale equivalent of a pixel.
 */
uchar
getgrey(Memimage *img, Point pt)
{
	uchar r, g, b, a;
	pixtorgba(getpixel(img, pt), &r, &g, &b, &a);
	return RGB2K(r, g, b);
}

/*
 * Return the value at pt in image, if image is interpreted
 * as a mask.  This means the alpha channel if present, else
 * the greyscale or its computed equivalent.
 */
uchar
getmask(Memimage *img, Point pt)
{
	if(img->flags&Falpha)
		return getpixel(img, pt)>>24;
	else
		return getgrey(img, pt);
}
#undef DBG

#define DBG if(0)
/*
 * Write a pixel to img at point pt.
 * 
 * We do this by reading a 32-bit little endian
 * value from p and then writing it back
 * after tweaking the appropriate bits.  Because
 * the data is little endian, we don't have to worry
 * about what the actual depth is, as long as it is
 * less than 32 bits.
 */
void
putpixel(Memimage *img, Point pt, u32int nv)
{
	uchar r, g, b, a, *p, *q;
	u32int c, mask, bits, v;
	int bpp, sh, npack, nbits;

	pixtorgba(nv, &r, &g, &b, &a);

	p = byteaddr(img, pt);
	v = p[0]|(p[1]<<8)|(p[2]<<16)|(p[3]<<24);
	bpp = img->depth;
DBG print("v %.8lux...", v);
	if(bpp < 8){
		/*
		 * Sub-byte greyscale pixels.  We need to skip the leftmost pt.x%npack pixels,
		 * which is equivalent to skipping the rightmost npack - pt.x%npack - 1 pixels.
		 */	
		npack = 8/bpp;
		sh = bpp*(npack - pt.x%npack - 1);
		bits = RGB2K(r,g,b);
DBG print("repl %lux 8 %d = %lux...", bits, bpp, replbits(bits, 8, bpp));
		bits = replbits(bits, 8, bpp);
		mask = (1<<bpp)-1;
DBG print("bits %lux mask %lux sh %d...", bits, mask, sh);
		mask <<= sh;
		bits <<= sh;
DBG print("(%lux & %lux) | (%lux & %lux)", v, ~mask, bits, mask);
		v = (v & ~mask) | (bits & mask);
	} else {
		/*
		 * General case.  We need to parse the channel descriptor again.
		 */
		sh = 0;
		for(c=img->chan; c; c>>=8){
			nbits = NBITS(c);
			switch(TYPE(c)){
			case CRed:
				bits = r;
				break;
			case CGreen:
				bits = g;
				break;
			case CBlue:
				bits = b;
				break;
			case CGrey:
				bits = RGB2K(r, g, b);
				break;
			case CAlpha:
				bits = a;
				break;
			case CIgnore:
				bits = 0;
				break;
			case CMap:
				q = img->cmap->rgb2cmap;
				bits = q[(r>>4)*16*16+(g>>4)*16+(b>>4)];
				break;
			default:
				SET(bits);
				fprint(2, "unknown channel type %lud\n", TYPE(c));
				abort();
			}

DBG print("repl %lux 8 %d = %lux...", bits, nbits, replbits(bits, 8, nbits));
			if(TYPE(c) != CMap)
				bits = replbits(bits, 8, nbits);
			mask = (1<<nbits)-1;
DBG print("bits %lux mask %lux sh %d...", bits, mask, sh);
			bits <<= sh;
			mask <<= sh;
			v = (v & ~mask) | (bits & mask);
			sh += nbits;
		}
	}
DBG print("v %.8lux\n", v);
	p[0] = v;
	p[1] = v>>8;
	p[2] = v>>16;
	p[3] = v>>24;	
}
#undef DBG

#define DBG if(0)
void
drawonepixel(Memimage *dst, Point dp, Memimage *src, Point sp, Memimage *mask, Point mp)
{
	uchar m, M, sr, sg, sb, sa, sk, dr, dg, db, da, dk;

	pixtorgba(getpixel(dst, dp), &dr, &dg, &db, &da);
	pixtorgba(getpixel(src, sp), &sr, &sg, &sb, &sa);
	m = getmask(mask, mp);
	M = 255-(sa*m + 127)/255;

DBG print("dst %x %x %x %x src %x %x %x %x m %x = ", dr,dg,db,da, sr,sg,sb,sa, m);
	if(dst->flags&Fgrey){
		/*
		 * We need to do the conversion to grey before the alpha calculation
		 * because the draw operator does this, and we need to be operating
		 * at the same precision so we get exactly the same answers.
		 */
		sk = RGB2K(sr, sg, sb);
		dk = RGB2K(dr, dg, db);
		dk = (sk*m + dk*M + 127)/255;
		dr = dg = db = dk;
		da = (sa*m + da*M + 127)/255;
	}else{
		/*
		 * True color alpha calculation treats all channels (including alpha)
		 * the same.  It might have been nice to use an array, but oh well.
		 */
		dr = (sr*m + dr*M + 127)/255;
		dg = (sg*m + dg*M + 127)/255;
		db = (sb*m + db*M + 127)/255;
		da = (sa*m + da*M + 127)/255;
	}

DBG print("%x %x %x %x\n", dr,dg,db,da);
	putpixel(dst, dp, rgbatopix(dr, dg, db, da));
}