aboutsummaryrefslogtreecommitdiff
path: root/engines/agi/picture.cpp
blob: 82a4d6f95a8b69ef0a235c03b294503903d27a8b (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
/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#include "common/stdafx.h"

#include "agi/agi.h"
#include "agi/graphics.h"


namespace Agi {

#define nextByte data[foffs++]

static uint8 *data;
static uint32 flen;
static uint32 foffs;

static uint8 patCode;
static uint8 patNum;
static uint8 priOn;
static uint8 scrOn;
static uint8 scrColour;
static uint8 priColour;

static uint8 circles[][15] = {	/* agi circle bitmaps */
	{0x80},
	/* {0xfc}, */
	{ 3 << 4 },	/* pattern data different from specs. fixes gold rush. does not seem to break any other v3 games */
	{0x5f, 0xf4},
	{0x66, 0xff, 0xf6, 0x60},
	{0x23, 0xbf, 0xff, 0xff, 0xee, 0x20},
	{0x31, 0xe7, 0x9e, 0xff, 0xff, 0xde, 0x79, 0xe3, 0x00},
	{0x38, 0xf9, 0xf3, 0xef, 0xff, 0xff, 0xff, 0xfe, 0xf9, 0xf3, 0xe3, 0x80},
	{0x18, 0x3c, 0x7e, 0x7e, 0x7e, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7e, 0x7e, 0x7e, 0x3c, 0x18}
};

static uint8 splatterMap[32] = {	/* splatter brush bitmaps */
	0x20, 0x94, 0x02, 0x24, 0x90, 0x82, 0xa4, 0xa2,
	0x82, 0x09, 0x0a, 0x22, 0x12, 0x10, 0x42, 0x14,
	0x91, 0x4a, 0x91, 0x11, 0x08, 0x12, 0x25, 0x10,
	0x22, 0xa8, 0x14, 0x24, 0x00, 0x50, 0x24, 0x04
};

static uint8 splatterStart[128] = {	/* starting bit position */
	0x00, 0x18, 0x30, 0xc4, 0xdc, 0x65, 0xeb, 0x48,
	0x60, 0xbd, 0x89, 0x05, 0x0a, 0xf4, 0x7d, 0x7d,
	0x85, 0xb0, 0x8e, 0x95, 0x1f, 0x22, 0x0d, 0xdf,
	0x2a, 0x78, 0xd5, 0x73, 0x1c, 0xb4, 0x40, 0xa1,
	0xb9, 0x3c, 0xca, 0x58, 0x92, 0x34, 0xcc, 0xce,
	0xd7, 0x42, 0x90, 0x0f, 0x8b, 0x7f, 0x32, 0xed,
	0x5c, 0x9d, 0xc8, 0x99, 0xad, 0x4e, 0x56, 0xa6,
	0xf7, 0x68, 0xb7, 0x25, 0x82, 0x37, 0x3a, 0x51,
	0x69, 0x26, 0x38, 0x52, 0x9e, 0x9a, 0x4f, 0xa7,
	0x43, 0x10, 0x80, 0xee, 0x3d, 0x59, 0x35, 0xcf,
	0x79, 0x74, 0xb5, 0xa2, 0xb1, 0x96, 0x23, 0xe0,
	0xbe, 0x05, 0xf5, 0x6e, 0x19, 0xc5, 0x66, 0x49,
	0xf0, 0xd1, 0x54, 0xa9, 0x70, 0x4b, 0xa4, 0xe2,
	0xe6, 0xe5, 0xab, 0xe4, 0xd2, 0xaa, 0x4c, 0xe3,
	0x06, 0x6f, 0xc6, 0x4a, 0xa4, 0x75, 0x97, 0xe1
};

void PictureMgr::putVirtPixel(int x, int y) {
	uint8 *p;

	if (x < 0 || y < 0 || x >= width || y >= height)
		return;

	p = &_vm->_game.sbuf16c[y * width + x];

	if (priOn)
		*p = (priColour << 4) | (*p & 0x0f);
	if (scrOn)
		*p = scrColour | (*p & 0xf0);
}

/* For the flood fill routines */

/* MH2 needs stack size > 300 */
#define STACK_SIZE 512
static unsigned int stackPtr;
static uint16 stack[STACK_SIZE];

static INLINE void lpush(uint16 c) {
	assert(stackPtr < STACK_SIZE);

	stack[stackPtr] = c;
	stackPtr++;
}

static INLINE uint16 lpop() {
	if (stackPtr == 0)
		return 0xffff;

	stackPtr--;
	return stack[stackPtr];
}

/**
 * Draw an AGI line.
 * A line drawing routine sent by Joshua Neal, modified by Stuart George
 * (fixed >>2 to >>1 and some other bugs like x1 instead of y1, etc.)
 * @param x1  x coordinate of start point
 * @param y1  y coordinate of start point
 * @param x2  x coordinate of end point
 * @param y2  y coordinate of end point
 */
void PictureMgr::drawLine(int x1, int y1, int x2, int y2) {
	int i, x, y, deltaX, deltaY, stepX, stepY, errorX, errorY, detdelta;

	/* CM: Do clipping */
#define clip(x, y) if((x)>=(y)) (x)=(y)
	clip(x1, width - 1);
	clip(x2, width - 1);
	clip(y1, height - 1);
	clip(y2, height - 1);

	/* Vertical line */

	if (x1 == x2) {
		if (y1 > y2) {
			y = y1;
			y1 = y2;
			y2 = y;
		}

		for (; y1 <= y2; y1++)
			putVirtPixel(x1, y1);

		return;
	}

	/* Horizontal line */

	if (y1 == y2) {
		if (x1 > x2) {
			x = x1;
			x1 = x2;
			x2 = x;
		}
		for (; x1 <= x2; x1++)
			putVirtPixel(x1, y1);
		return;
	}

	y = y1;
	x = x1;

	stepY = 1;
	deltaY = y2 - y1;
	if (deltaY < 0) {
		stepY = -1;
		deltaY = -deltaY;
	}

	stepX = 1;
	deltaX = x2 - x1;
	if (deltaX < 0) {
		stepX = -1;
		deltaX = -deltaX;
	}

	if (deltaY > deltaX) {
		i = deltaY;
		detdelta = deltaY;
		errorX = deltaY / 2;
		errorY = 0;
	} else {
		i = deltaX;
		detdelta = deltaX;
		errorX = 0;
		errorY = deltaX / 2;
	}

	putVirtPixel(x, y);

	do {
		errorY += deltaY;
		if (errorY >= detdelta) {
			errorY -= detdelta;
			y += stepY;
		}

		errorX += deltaX;
		if (errorX >= detdelta) {
			errorX -= detdelta;
			x += stepX;
		}

		putVirtPixel(x, y);
		i--;
	} while (i > 0);
}

/**
 * Draw a relative AGI line.
 * Draws short lines relative to last position. (drawing action 0xF7)
 */
void PictureMgr::dynamicDrawLine() {
	int x1, y1, disp, dx, dy;

	x1 = nextByte;
	y1 = nextByte;

	putVirtPixel(x1, y1);

	for (;;) {
		if ((disp = nextByte) >= 0xf0)
			break;

		dx = ((disp & 0xf0) >> 4) & 0x0f;
		dy = (disp & 0x0f);

		if (dx & 0x08)
			dx = -(dx & 0x07);
		if (dy & 0x08)
			dy = -(dy & 0x07);

		drawLine(x1, y1, x1 + dx, y1 + dy);
		x1 += dx;
		y1 += dy;
	}
	foffs--;
}

/**************************************************************************
** absoluteLine
**
** Draws long lines to actual locations (cf. relative) (drawing action 0xF6)
**************************************************************************/
void PictureMgr::absoluteDrawLine() {
	int x1, y1, x2, y2;

	x1 = nextByte;
	y1 = nextByte;
	putVirtPixel(x1, y1);

	for (;;) {
		if ((x2 = nextByte) >= 0xf0)
			break;

		if ((y2 = nextByte) >= 0xf0)
			break;

		drawLine(x1, y1, x2, y2);
		x1 = x2;
		y1 = y2;
	}
	foffs--;
}

/**************************************************************************
** okToFill
**************************************************************************/
INLINE int PictureMgr::isOkFillHere(int x, int y) {
	uint8 p;

	if (x < 0 || x >= width || y < 0 || y >= height)
		return false;

	if (!scrOn && !priOn)
		return false;

	p = _vm->_game.sbuf16c[y * width + x];

	if (!priOn && scrOn && scrColour != 15)
		return (p & 0x0f) == 15;

	if (priOn && !scrOn && priColour != 4)
		return (p >> 4) == 4;

	return (scrOn && (p & 0x0f) == 15 && scrColour != 15);
}

/**************************************************************************
** agi_fill
**************************************************************************/
void PictureMgr::fillScanline(int x, int y) {
	unsigned int c;
	int newspanUp, newspanDown;

	if (!isOkFillHere(x, y))
		return;

	/* Scan for left border */
	for (c = x - 1; isOkFillHere(c, y); c--);

	newspanUp = newspanDown = 1;
	for (c++; isOkFillHere(c, y); c++) {
		putVirtPixel(c, y);
		if (isOkFillHere(c, y - 1)) {
			if (newspanUp) {
				lpush(c + 320 * (y - 1));
				newspanUp = 0;
			}
		} else {
			newspanUp = 1;
		}

		if (isOkFillHere(c, y + 1)) {
			if (newspanDown) {
				lpush(c + 320 * (y + 1));
				newspanDown = 0;
			}
		} else {
			newspanDown = 1;
		}
	}
}

void PictureMgr::agiFill(unsigned int x, unsigned int y) {
	lpush(x + 320 * y);

	for (;;) {
		uint16 c = lpop();

		/* Exit if stack is empty */
		if (c == 0xffff)
			break;

		x = c % 320;
		y = c / 320;

		fillScanline(x, y);
	}

	stackPtr = 0;
}

/**************************************************************************
** xCorner
**
** Draws an xCorner  (drawing action 0xF5)
**************************************************************************/
void PictureMgr::xCorner() {
	int x1, x2, y1, y2;

	x1 = nextByte;
	y1 = nextByte;
	putVirtPixel(x1, y1);

	for (;;) {
		x2 = nextByte;

		if (x2 >= 0xf0)
			break;

		drawLine(x1, y1, x2, y1);
		x1 = x2;
		y2 = nextByte;

		if (y2 >= 0xf0)
			break;

		drawLine(x1, y1, x1, y2);
		y1 = y2;
	}
	foffs--;
}

/**************************************************************************
** yCorner
**
** Draws an yCorner  (drawing action 0xF4)
**************************************************************************/
void PictureMgr::yCorner() {
	int x1, x2, y1, y2;

	x1 = nextByte;
	y1 = nextByte;
	putVirtPixel(x1, y1);

	for (;;) {
		y2 = nextByte;

		if (y2 >= 0xf0)
			break;

		drawLine(x1, y1, x1, y2);
		y1 = y2;
		x2 = nextByte;

		if (x2 >= 0xf0)
			break;

		drawLine(x1, y1, x2, y1);
		x1 = x2;
	}

	foffs--;
}

/**************************************************************************
** fill
**
** AGI flood fill.  (drawing action 0xF8)
**************************************************************************/
void PictureMgr::fill() {
	int x1, y1;

	while ((x1 = nextByte) < 0xf0 && (y1 = nextByte) < 0xf0)
		agiFill(x1, y1);

	foffs--;
}

/**************************************************************************
** plotPattern
**
** Draws pixels, circles, squares, or splatter brush patterns depending
** on the pattern code.
**************************************************************************/

int PictureMgr::plotPatternPoint(int x, int y, int bitpos) {
	if (patCode & 0x20) {
		if ((splatterMap[bitpos >> 3] >> (7 - (bitpos & 7))) & 1) {
			putVirtPixel(x, y);
		}
		bitpos++;
		if (bitpos == 0xff)
			bitpos = 0;
	} else
		putVirtPixel(x, y);

	return bitpos;
}

void PictureMgr::plotPattern(int x, int y) {
	int32 circlePos = 0;
	uint32 x1, y1, pensize, bitpos = splatterStart[patNum];

	pensize = (patCode & 7);

	if (x < (int)pensize)
		x = pensize - 1;
	if (y < (int)pensize)
		y = pensize;

	for (y1 = y - pensize; y1 <= y + pensize; y1++) {
		for (x1 = x - (pensize + 1) / 2; x1 <= x + pensize / 2; x1++) {
			if (patCode & 0x10) {	/* Square */
				bitpos = plotPatternPoint (x1, y1, bitpos);
			} else {	/* Circle */
				if ((circles[patCode & 7][circlePos >> 3] >> (7 - (circlePos & 7))) & 1) {
					bitpos = plotPatternPoint(x1, y1, bitpos);
				}
				circlePos++;
			}
		}
	}
}

/**************************************************************************
** plotBrush
**
** Plots points and various brush patterns.
**************************************************************************/
void PictureMgr::plotBrush() {
	int x1, y1;

	for (;;) {
		if (patCode & 0x20) {
			if ((patNum = nextByte) >= 0xf0)
				break;
			patNum = (patNum >> 1) & 0x7f;
		}

		if ((x1 = nextByte) >= 0xf0)
			break;

		if ((y1 = nextByte) >= 0xf0)
			break;

		plotPattern(x1, y1);
	}

	foffs--;
}

/**************************************************************************
** Draw AGI picture
**************************************************************************/

void PictureMgr::drawPicture() {
	uint8 act;
	int drawing;

	patCode = 0;
	patNum = 0;
	priOn = scrOn = false;
	scrColour = 0xf;
	priColour = 0x4;

	drawing = 1;

	debugC(8, kDebugLevelMain, "Drawing v2 picture");
	for (drawing = 1; drawing && foffs < flen;) {
		act = nextByte;

		if (pictureType == AGIPIC_C64 && act >= 0xf0 && act <= 0xfe) {
			scrColour = act - 0xf0;
			continue;
		}

		switch (act) {
		case 0xe0:	// x-corner (C64)
			xCorner();
			break;
		case 0xe1:	// y-corner (C64)
			yCorner();
			break;
		case 0xe2:	// dynamic draw lines (C64)
			dynamicDrawLine();
			break;
		case 0xe3:	// absolute draw lines (C64)
			absoluteDrawLine();
			break;
		case 0xe4:	// fill (C64)
			scrColour = nextByte;
			scrColour &= 0xF;	/* for v3 drawing diff */
			fill();
			break;
		case 0xe5:	// enable screen drawing (C64)
			scrOn = true;
			break;
		case 0xe6:	// plot brush (C64)
			patCode = nextByte;
			plotBrush();
			break;
		case 0xf0:	// set colour on screen (AGI pic v2)
			scrColour = nextByte;
			scrColour &= 0xF;	// for v3 drawing diff
			scrOn = true;
			break;
		case 0xf1:
			if (pictureType == AGIPIC_V1) {
				scrColour = nextByte;
				scrColour &= 0xF;	// for v3 drawing diff
				scrOn = true;
				priOn = false;
			} else if (pictureType == AGIPIC_V15) {	// set colour on screen
				scrColour = nextByte;
				scrColour &= 0xF;
			} else if (pictureType == AGIPIC_V2) {	// disable screen drawing
				scrOn = false;
			}
			break;
		case 0xf2:	// set colour on priority (AGI pic v2)
			priColour = nextByte;
			priColour &= 0xf;	// for v3 drawing diff
			priOn = true;
			break;
		case 0xf3:
			if (pictureType == AGIPIC_V1) {
				scrColour = nextByte;
				scrColour &= 0xF;	// for v3 drawing diff
				scrOn = true;
				priColour = nextByte;
				priColour &= 0xf;	// for v3 drawing diff
				priOn = true;
			}

			// Empty in AGI pic V1.5

			if (pictureType == AGIPIC_V2)	// disable priority screen
				priOn = false;
			break;
		case 0xf4:	// y-corner
			yCorner();
			break;
		case 0xf5:	// x-corner
			xCorner();
			break;
		case 0xf6:	// absolute draw lines
			absoluteDrawLine();
			break;
		case 0xf7:	// dynamic draw lines
			dynamicDrawLine();
			break;
		case 0xf8:	// fill
			if (pictureType == AGIPIC_V15) {
				absoluteDrawLine();
			} else if (pictureType == AGIPIC_V2) {
				fill();
			}
			break;
		case 0xf9:	// set pattern
			if (pictureType == AGIPIC_V15) {
				absoluteDrawLine();
			} else if (pictureType == AGIPIC_V2) {
				patCode = nextByte;

				if (_vm->getGameType() == GType_PreAGI)
					plotBrush();
			}
			break;
		case 0xfa:	// plot brush
			if (pictureType == AGIPIC_V1) {
				scrOn = false;
				priOn = true;
				absoluteDrawLine();
				scrOn = true;
				priOn = false;
			} else if (pictureType == AGIPIC_V15) {
				absoluteDrawLine();
			} else if (pictureType == AGIPIC_V2) {
				plotBrush();
			}
			break;
		case 0xfb:
			if (pictureType == AGIPIC_V1) {
				dynamicDrawLine();
			} else if (pictureType == AGIPIC_V15) {
				absoluteDrawLine();
			}
			break;
		case 0xfc:	// fill (AGI pic v1)
			scrColour = nextByte;
			scrColour &= 0xF;
			priColour = nextByte;
			priColour &= 0xf;
			fill();
			break;
		case 0xfe:	// fill (AGI pic v1.5)
			scrColour = nextByte;
			scrColour &= 0xF;
			scrOn = true;
			fill();
			break;
		case 0xff:	// end of pic data
			drawing = 0;
			break;
		default:
			warning("Unknown v2 picture opcode (%x)", act);
		}
	}
}

/*
 * Public functions
 */

/**
 * convert AGI v3 format picture to AGI v2 format
 */
uint8 *PictureMgr::convertV3Pic(uint8 *src, uint32 len) {
	uint8 d, old = 0, x, *in, *xdata, *out, mode = 0;
	uint32 i, ulen;

	xdata = (uint8 *)malloc(len + len / 2);

	out = xdata;
	in = src;

	for (i = ulen = 0; i < len; i++, ulen++) {
		d = *in++;

		*out++ = x = mode ? ((d & 0xF0) >> 4) + ((old & 0x0F) << 4) : d;

		if (x == 0xFF) {
			ulen++;
			break;
		}

		if (x == 0xf0 || x == 0xf2) {
			if (mode) {
				*out++ = d & 0x0F;
				ulen++;
			} else {
				d = *in++;
				*out++ = (d & 0xF0) >> 4;
				i++, ulen++;
			}

			mode = !mode;
		}

		old = d;
	}

	free(src);
	xdata = (uint8 *)realloc(xdata, ulen);

	return xdata;
}

/**
 * Decode an AGI picture resource.
 * This function decodes an AGI picture resource into the correct slot
 * and draws it on the AGI screen, optionally clearing the screen before
 * drawing.
 * @param n      AGI picture resource number
 * @param clear  clear AGI screen before drawing
 * @param agi256 load an AGI256 picture resource
 */
int PictureMgr::decodePicture(int n, int clear, bool agi256, int pic_width, int pic_height) {
	debugC(8, kDebugLevelResources, "(%d)", n);

	patCode = 0;
	patNum = 0;
	priOn = scrOn = false;
	scrColour = 0xF;
	priColour = 0x4;

	data = _vm->_game.pictures[n].rdata;
	flen = _vm->_game.dirPic[n].len;
	foffs = 0;

	width = pic_width;
	height = pic_height;

	if (clear && !agi256) // 256 color pictures should always fill the whole screen, so no clearing for them.
		memset(_vm->_game.sbuf16c, 0x4f, width * height); // Clear 16 color AGI screen (Priority 4, color white).

	if (!agi256) {
		drawPicture(); // Draw 16 color picture.
	} else {
		const uint32 maxFlen = width * height;
		memcpy(_vm->_game.sbuf256c, data, MIN(flen, maxFlen)); // Draw 256 color picture.

		if (flen < maxFlen) {
			warning("Undersized AGI256 picture resource %d, using it anyway. Filling rest with white.", n);
			memset(_vm->_game.sbuf256c + flen, 0x0f, maxFlen - flen); // Fill missing area with white.
		} else if (flen > maxFlen)
			warning("Oversized AGI256 picture resource %d, decoding only %ux%u part of it", n, width, height);
	}

	if (clear)
		_vm->clearImageStack();
	_vm->recordImageStackCall(ADD_PIC, n, clear, agi256, 0, 0, 0, 0);

	return errOK;
}

/**
 * Unload an AGI picture resource.
 * This function unloads an AGI picture resource and deallocates
 * resource data.
 * @param n AGI picture resource number
 */
int PictureMgr::unloadPicture(int n) {
	/* remove visual buffer & priority buffer if they exist */
	if (_vm->_game.dirPic[n].flags & RES_LOADED) {
		free(_vm->_game.pictures[n].rdata);
		_vm->_game.dirPic[n].flags &= ~RES_LOADED;
	}

	return errOK;
}

/**
 * Show AGI picture.
 * This function copies a ``hidden'' AGI picture to the output device.
 */
void PictureMgr::showPic(int x, int pic_width, int pic_height) {
	int i, y;
	int offset;
	width = pic_width;
	height = pic_height;

	debugC(8, kDebugLevelMain, "Show picture!");

	i = 0;
	offset = _vm->_game.lineMinPrint * CHAR_LINES;
	for (y = 0; y < height; y++) {
		_gfx->putPixelsA(x, y + offset, width, &_vm->_game.sbuf16c[i]);
		i += width;
	}

	_gfx->flushScreen();
}

} // End of namespace Agi