aboutsummaryrefslogtreecommitdiff
path: root/engines/sword1/screen.cpp
blob: e5b1fcd5e5cc333e97c497fd862800343566201f (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
/* 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/system.h"
#include "common/util.h"

#include "sword1/screen.h"
#include "sword1/logic.h"
#include "sword1/sworddefs.h"
#include "sword1/text.h"
#include "sword1/resman.h"
#include "sword1/objectman.h"
#include "sword1/menu.h"
#include "sword1/sword1.h"

#ifdef BACKEND_8BIT
#include "sword1/animation.h"
#endif

namespace Sword1 {

#define SCROLL_FRACTION 16
#define MAX_SCROLL_DISTANCE 8
#define FADE_UP 1
#define FADE_DOWN -1

Screen::Screen(OSystem *system, ResMan *pResMan, ObjectMan *pObjMan) {
	_system = system;
	_resMan = pResMan;
	_objMan = pObjMan;
	_screenBuf = _screenGrid = NULL;
	_backLength = _foreLength = _sortLength = 0;
	_fadingStep = 0;
	_currentScreen = 0xFFFF;
	_updatePalette = false;
}

Screen::~Screen(void) {
	free(_screenBuf);
	free(_screenGrid);
	if (_currentScreen != 0xFFFF)
		quitScreen();
}

void Screen::clearScreen(void) {
	if (_screenBuf) {
		_fullRefresh = true;
		memset(_screenBuf, 0, _scrnSizeX * _scrnSizeY);
		_system->fillScreen(0);
	}
}

void Screen::useTextManager(Text *pTextMan) {
	_textMan = pTextMan;
}

int32 Screen::inRange(int32 a, int32 b, int32 c) { // return b(!) so that: a <= b <= c
	return (a > b) ? (a) : ((b < c) ? b : c);
}

void Screen::setScrolling(int16 offsetX, int16 offsetY) {
	offsetX = inRange(0, offsetX, Logic::_scriptVars[MAX_SCROLL_OFFSET_X]);
	offsetY = inRange(0, offsetY, Logic::_scriptVars[MAX_SCROLL_OFFSET_Y]);

	if (Logic::_scriptVars[SCROLL_FLAG] == 2) { // first time on this screen - need absolute scroll immediately!
		_oldScrollX = Logic::_scriptVars[SCROLL_OFFSET_X] = (uint32)offsetX;
		_oldScrollY = Logic::_scriptVars[SCROLL_OFFSET_Y] = (uint32)offsetY;
		Logic::_scriptVars[SCROLL_FLAG] = 1;
		_fullRefresh = true;
	} else if (Logic::_scriptVars[SCROLL_FLAG] == 1) {
		// Because parallax layers may be drawn on the old scroll offset, we
		// want a full refresh not only when the scroll offset changes, but
		// also on the frame where they become the same.
		if (_oldScrollX != Logic::_scriptVars[SCROLL_OFFSET_X] || _oldScrollY != Logic::_scriptVars[SCROLL_OFFSET_Y])
			_fullRefresh = true;
		_oldScrollX = Logic::_scriptVars[SCROLL_OFFSET_X];
		_oldScrollY = Logic::_scriptVars[SCROLL_OFFSET_Y];
		int dx = offsetX - Logic::_scriptVars[SCROLL_OFFSET_X];
		int dy = offsetY - Logic::_scriptVars[SCROLL_OFFSET_Y];
		int scrlDistX = inRange(-MAX_SCROLL_DISTANCE, (((SCROLL_FRACTION - 1) + ABS(dx)) / SCROLL_FRACTION) * ((dx > 0) ? 1 : -1), MAX_SCROLL_DISTANCE);
		int scrlDistY = inRange(-MAX_SCROLL_DISTANCE, (((SCROLL_FRACTION - 1) + ABS(dy)) / SCROLL_FRACTION) * ((dy > 0) ? 1 : -1), MAX_SCROLL_DISTANCE);
		if ((scrlDistX != 0) || (scrlDistY != 0))
			_fullRefresh = true;
		Logic::_scriptVars[SCROLL_OFFSET_X] = inRange(0, Logic::_scriptVars[SCROLL_OFFSET_X] + scrlDistX, Logic::_scriptVars[MAX_SCROLL_OFFSET_X]);
		Logic::_scriptVars[SCROLL_OFFSET_Y] = inRange(0, Logic::_scriptVars[SCROLL_OFFSET_Y] + scrlDistY, Logic::_scriptVars[MAX_SCROLL_OFFSET_Y]);
	} else {
		// SCROLL_FLAG == 0, this usually means that the screen is smaller than 640x400 and doesn't need scrolling at all
		// however, it can also mean that the gamescript overwrote the scrolling flag to take care of scrolling directly,
		// (see bug report #1345130) so we ignore the offset arguments in this case
		Logic::_scriptVars[SCROLL_OFFSET_X] = inRange(0, Logic::_scriptVars[SCROLL_OFFSET_X], Logic::_scriptVars[MAX_SCROLL_OFFSET_X]);
		Logic::_scriptVars[SCROLL_OFFSET_Y] = inRange(0, Logic::_scriptVars[SCROLL_OFFSET_Y], Logic::_scriptVars[MAX_SCROLL_OFFSET_Y]);
		if ((Logic::_scriptVars[SCROLL_OFFSET_X] != _oldScrollX) || (Logic::_scriptVars[SCROLL_OFFSET_Y] != _oldScrollY)) {
			_fullRefresh = true;
			_oldScrollX = Logic::_scriptVars[SCROLL_OFFSET_X];
			_oldScrollY = Logic::_scriptVars[SCROLL_OFFSET_Y];
		}
	}
}

void Screen::fadeDownPalette(void) {
	if (!_isBlack) { // don't fade down twice
		_fadingStep = 15;
		_fadingDirection = FADE_DOWN;
	}
}

void Screen::fadeUpPalette(void) {
	_fadingStep = 1;
	_fadingDirection = FADE_UP;
}

void Screen::fnSetPalette(uint8 start, uint16 length, uint32 id, bool fadeUp) {
	uint8 *palData = (uint8*)_resMan->openFetchRes(id);
	if (start == 0) // force color 0 to black
		palData[0] = palData[1] = palData[2] = 0;

	if (SwordEngine::_systemVars.isMac) {  // see bug #1701058
		if (start != 0 && start + length == 256) // and force color 255 to black as well
			palData[(length-1)*3+0] = palData[(length-1)*3+1] = palData[(length-1)*3+2] = 0;
	}

	for (uint32 cnt = 0; cnt < length; cnt++) {
		_targetPalette[(start + cnt) * 4 + 0] = palData[cnt * 3 + 0] << 2;
		_targetPalette[(start + cnt) * 4 + 1] = palData[cnt * 3 + 1] << 2;
		_targetPalette[(start + cnt) * 4 + 2] = palData[cnt * 3 + 2] << 2;
	}
	_resMan->resClose(id);
	_isBlack = false;
	if (fadeUp) {
		_fadingStep = 1;
		_fadingDirection = FADE_UP;
		memset(_currentPalette, 0, 256 * 4);
		_system->setPalette(_currentPalette, 0, 256);
	} else
		_system->setPalette(_targetPalette + 4 * start, start, length);
}

void Screen::fullRefresh(void) {
	_fullRefresh = true;
	_system->setPalette(_targetPalette, 0, 256);
}

bool Screen::stillFading(void) {
	return (_fadingStep != 0);
}

bool Screen::showScrollFrame(void) {
	if ((!_fullRefresh) || Logic::_scriptVars[NEW_PALETTE] || _updatePalette)
		return false; // don't draw an additional frame if we aren't scrolling or have to change the palette
	if ((_oldScrollX == Logic::_scriptVars[SCROLL_OFFSET_X]) &&
		(_oldScrollY == Logic::_scriptVars[SCROLL_OFFSET_Y]))
		return false; // check again if we *really* are scrolling.

	uint16 avgScrlX = (uint16)(_oldScrollX + Logic::_scriptVars[SCROLL_OFFSET_X]) / 2;
	uint16 avgScrlY = (uint16)(_oldScrollY + Logic::_scriptVars[SCROLL_OFFSET_Y]) / 2;

	_system->copyRectToScreen(_screenBuf + avgScrlY * _scrnSizeX + avgScrlX, _scrnSizeX, 0, 40, SCREEN_WIDTH, SCREEN_DEPTH);
	_system->updateScreen();
	return true;
}

void Screen::updateScreen(void) {
	if (Logic::_scriptVars[NEW_PALETTE]) {
		_fadingStep = 1;
		_fadingDirection = FADE_UP;
		_updatePalette = true;
		Logic::_scriptVars[NEW_PALETTE] = 0;
	}
	if (_updatePalette) {
		fnSetPalette(0, 184, _roomDefTable[_currentScreen].palettes[0], false);
		fnSetPalette(184, 72, _roomDefTable[_currentScreen].palettes[1], false);
		_updatePalette = false;
	}
	if (_fadingStep) {
		fadePalette();
		_system->setPalette(_currentPalette, 0, 256);
	}

	uint16 scrlX = (uint16)Logic::_scriptVars[SCROLL_OFFSET_X];
	uint16 scrlY = (uint16)Logic::_scriptVars[SCROLL_OFFSET_Y];
	if (_fullRefresh) {
		_fullRefresh = false;
		uint16 copyWidth = SCREEN_WIDTH;
		uint16 copyHeight = SCREEN_DEPTH;
		if (scrlX + copyWidth > _scrnSizeX)
			copyWidth = _scrnSizeX - scrlX;
		if (scrlY + copyHeight > _scrnSizeY)
			copyHeight = _scrnSizeY - scrlY;
		_system->copyRectToScreen(_screenBuf + scrlY * _scrnSizeX + scrlX, _scrnSizeX, 0, 40, copyWidth, copyHeight);
	} else {
		// partial screen update only. The screen coordinates probably won't fit to the
		// grid holding the informations on which blocks have to be updated.
		// as the grid will be X pixel higher and Y pixel more to the left, this can be cured
		// by first checking the top border, then the left column and then the remaining (aligned) part.
		uint8 *gridPos = _screenGrid + (scrlX / SCRNGRID_X) + (scrlY / SCRNGRID_Y) * _gridSizeX;
		uint8 *scrnBuf = _screenBuf + scrlY * _scrnSizeX + scrlX;
		uint8 diffX = (uint8)(scrlX % SCRNGRID_X);
		uint8 diffY = (uint8)(scrlY % SCRNGRID_Y);
		uint16 gridW = SCREEN_WIDTH / SCRNGRID_X;
		uint16 gridH = SCREEN_DEPTH / SCRNGRID_Y;
		if (diffY) {
			diffY = SCRNGRID_Y - diffY;
			uint16 cpWidth = 0;
			for (uint16 cntx = 0; cntx < gridW; cntx++)
				if (gridPos[cntx]) {
					gridPos[cntx] >>= 1;
					cpWidth++;
				} else if (cpWidth) {
					int16 xPos = (cntx - cpWidth) * SCRNGRID_X - diffX;
					if (xPos < 0)
						xPos = 0;
					_system->copyRectToScreen(scrnBuf + xPos, _scrnSizeX, xPos, 40, cpWidth * SCRNGRID_X, diffY);
					cpWidth = 0;
				}
			if (cpWidth) {
				int16 xPos = (gridW - cpWidth) * SCRNGRID_X - diffX;
				if (xPos < 0)
					xPos = 0;
				_system->copyRectToScreen(scrnBuf + xPos, _scrnSizeX, xPos, 40, SCREEN_WIDTH - xPos, diffY);
			}
			scrlY += diffY;
		}
		// okay, y scrolling is compensated. check x now.
		gridPos = _screenGrid + (scrlX / SCRNGRID_X) + (scrlY / SCRNGRID_Y) * _gridSizeX;
		scrnBuf = _screenBuf + scrlY * _scrnSizeX + scrlX;
		if (diffX) {
			diffX = SCRNGRID_X - diffX;
			uint16 cpHeight = 0;
			for (uint16 cnty = 0; cnty < gridH; cnty++) {
				if (*gridPos) {
					*gridPos >>= 1;
					cpHeight++;
				} else if (cpHeight) {
					uint16 yPos = (cnty - cpHeight) * SCRNGRID_Y;
					_system->copyRectToScreen(scrnBuf + yPos * _scrnSizeX, _scrnSizeX, 0, yPos + diffY + 40, diffX, cpHeight * SCRNGRID_Y);
					cpHeight = 0;
				}
				gridPos += _gridSizeX;
			}
			if (cpHeight) {
				uint16 yPos = (gridH - cpHeight) * SCRNGRID_Y;
				_system->copyRectToScreen(scrnBuf + yPos * _scrnSizeX, _scrnSizeX, 0, yPos + diffY + 40, diffX, SCREEN_DEPTH - (yPos + diffY));
			}
			scrlX += diffX;
		}
		// x scroll is compensated, too. check the rest of the screen, now.
		scrnBuf = _screenBuf + scrlY * _scrnSizeX + scrlX;
		gridPos = _screenGrid + (scrlX / SCRNGRID_X) + (scrlY / SCRNGRID_Y) * _gridSizeX;
		for (uint16 cnty = 0; cnty < gridH; cnty++) {
			uint16 cpWidth = 0;
			uint16 cpHeight = SCRNGRID_Y;
			if (cnty == gridH - 1)
				cpHeight = SCRNGRID_Y - diffY;
			for (uint16 cntx = 0; cntx < gridW; cntx++)
				if (gridPos[cntx]) {
					gridPos[cntx] >>= 1;
					cpWidth++;
				} else if (cpWidth) {
					_system->copyRectToScreen(scrnBuf + (cntx - cpWidth) * SCRNGRID_X, _scrnSizeX, (cntx - cpWidth) * SCRNGRID_X + diffX, cnty * SCRNGRID_Y + diffY + 40, cpWidth * SCRNGRID_X, cpHeight);
					cpWidth = 0;
				}
			if (cpWidth) {
				uint16 xPos = (gridW - cpWidth) * SCRNGRID_X;
				_system->copyRectToScreen(scrnBuf + xPos, _scrnSizeX, xPos + diffX, cnty * SCRNGRID_Y + diffY + 40, SCREEN_WIDTH - (xPos + diffX), cpHeight);
			}
			gridPos += _gridSizeX;
			scrnBuf += _scrnSizeX * SCRNGRID_Y;
		}
	}
	_system->updateScreen();
}

void Screen::newScreen(uint32 screen) {
	uint8 cnt;
	// set sizes and scrolling, initialize/load screengrid, force screen refresh
	_currentScreen = screen;
	_scrnSizeX = _roomDefTable[screen].sizeX;
	_scrnSizeY = _roomDefTable[screen].sizeY;
	_gridSizeX = _scrnSizeX / SCRNGRID_X;
	_gridSizeY = _scrnSizeY / SCRNGRID_Y;
	if ((_scrnSizeX % SCRNGRID_X) || (_scrnSizeY % SCRNGRID_Y))
		error("Illegal screensize: %d: %d/%d", screen, _scrnSizeX, _scrnSizeY);
	if ((_scrnSizeX > SCREEN_WIDTH) || (_scrnSizeY > SCREEN_DEPTH)) {
		Logic::_scriptVars[SCROLL_FLAG] = 2;
		Logic::_scriptVars[MAX_SCROLL_OFFSET_X] = _scrnSizeX - SCREEN_WIDTH;
		Logic::_scriptVars[MAX_SCROLL_OFFSET_Y] = _scrnSizeY - SCREEN_DEPTH;
	} else {
		Logic::_scriptVars[SCROLL_FLAG] = 0;
		Logic::_scriptVars[MAX_SCROLL_OFFSET_X] = 0;
		Logic::_scriptVars[MAX_SCROLL_OFFSET_Y] = 0;
	}
	Logic::_scriptVars[SCROLL_OFFSET_X] = 0;
	Logic::_scriptVars[SCROLL_OFFSET_Y] = 0;

	if (_screenBuf)
		free(_screenBuf);
	if (_screenGrid)
		free(_screenGrid);
	_screenBuf = (uint8*)malloc(_scrnSizeX * _scrnSizeY);
	_screenGrid = (uint8*)malloc(_gridSizeX * _gridSizeY);
	memset(_screenGrid, 0, _gridSizeX * _gridSizeY);
	for (cnt = 0; cnt < _roomDefTable[_currentScreen].totalLayers; cnt++) {
		// open and lock all resources, will be closed in quitScreen()
		_layerBlocks[cnt] = (uint8*)_resMan->openFetchRes(_roomDefTable[_currentScreen].layers[cnt]);
		if (cnt > 0)
			_layerBlocks[cnt] += sizeof(Header);
	}
	for (cnt = 0; cnt < _roomDefTable[_currentScreen].totalLayers - 1; cnt++) {
		// there's no grid for the background layer, so it's totalLayers - 1
		_layerGrid[cnt] = (uint16*)_resMan->openFetchRes(_roomDefTable[_currentScreen].grids[cnt]);
		_layerGrid[cnt] += 14;
	}
	_parallax[0] = _parallax[1] = NULL;
	if (_roomDefTable[_currentScreen].parallax[0])
		_parallax[0] = (uint8*)_resMan->openFetchRes(_roomDefTable[_currentScreen].parallax[0]);
	if (_roomDefTable[_currentScreen].parallax[1])
		_parallax[1] = (uint8*)_resMan->openFetchRes(_roomDefTable[_currentScreen].parallax[1]);

	_updatePalette = true;
	_fullRefresh = true;
}

void Screen::quitScreen(void) {
	uint8 cnt;
	for (cnt = 0; cnt < _roomDefTable[_currentScreen].totalLayers; cnt++)
		_resMan->resClose(_roomDefTable[_currentScreen].layers[cnt]);
	for (cnt = 0; cnt < _roomDefTable[_currentScreen].totalLayers - 1; cnt++)
		_resMan->resClose(_roomDefTable[_currentScreen].grids[cnt]);
	if (_roomDefTable[_currentScreen].parallax[0])
		_resMan->resClose(_roomDefTable[_currentScreen].parallax[0]);
	if (_roomDefTable[_currentScreen].parallax[1])
		_resMan->resClose(_roomDefTable[_currentScreen].parallax[1]);
	_currentScreen = 0xFFFF;
}

void Screen::draw(void) {
	uint8 cnt;
	if (_currentScreen == 54) {
		// rm54 has a BACKGROUND parallax layer in parallax[0]
		if (_parallax[0])
			renderParallax(_parallax[0]);
		uint8 *src = _layerBlocks[0];
		uint8 *dest = _screenBuf;

		for (uint16 cnty = 0; cnty < _scrnSizeY; cnty++)
			for (uint16 cntx = 0; cntx < _scrnSizeX; cntx++) {
				if (*src)
					if (!SwordEngine::_systemVars.isMac || *src != 255) // see bug #1701058
						*dest = *src;
				dest++;
				src++;
			}

	} else
		memcpy(_screenBuf, _layerBlocks[0], _scrnSizeX * _scrnSizeY);

	for (cnt = 0; cnt < _backLength; cnt++)
		processImage(_backList[cnt]);

	for (cnt = 0; cnt < _sortLength - 1; cnt++)
		for (uint8 sCnt = 0; sCnt < _sortLength - 1; sCnt++)
			if (_sortList[sCnt].y > _sortList[sCnt + 1].y) {
				SWAP(_sortList[sCnt], _sortList[sCnt + 1]);
			}
	for (cnt = 0; cnt < _sortLength; cnt++)
		processImage(_sortList[cnt].id);

	if ((_currentScreen != 54) && _parallax[0])
		renderParallax(_parallax[0]); // screens other than 54 have FOREGROUND parallax layer in parallax[0]
	if (_parallax[1])
		renderParallax(_parallax[1]);

	for (cnt = 0; cnt < _foreLength; cnt++)
		processImage(_foreList[cnt]);

	_backLength = _sortLength = _foreLength = 0;
}

void Screen::processImage(uint32 id) {
	Object *compact;
	FrameHeader *frameHead;
	int scale;

	compact = _objMan->fetchObject(id);
	if (compact->o_type == TYPE_TEXT)
		frameHead = _textMan->giveSpriteData((uint8)compact->o_target);
	else
		frameHead = _resMan->fetchFrame(_resMan->openFetchRes(compact->o_resource), compact->o_frame);

	uint8 *sprData = ((uint8*)frameHead) + sizeof(FrameHeader);

	uint16 spriteX = compact->o_anim_x;
	uint16 spriteY = compact->o_anim_y;
	if (compact->o_status & STAT_SHRINK) {
		scale = (compact->o_scale_a * compact->o_ycoord + compact->o_scale_b) / 256;
		spriteX += ((int16)_resMan->readUint16(&frameHead->offsetX) * scale) / 256;
		spriteY += ((int16)_resMan->readUint16(&frameHead->offsetY) * scale) / 256;
	} else {
		scale = 256;
		spriteX += (int16)_resMan->readUint16(&frameHead->offsetX);
		spriteY += (int16)_resMan->readUint16(&frameHead->offsetY);
	}

	uint8 *tonyBuf = NULL;
	if (frameHead->runTimeComp[3] == '7') { // RLE7 encoded?
		decompressRLE7(sprData, _resMan->readUint32(&frameHead->compSize), _rleBuffer);
		sprData = _rleBuffer;
	} else if (frameHead->runTimeComp[3] == '0') { // RLE0 encoded?
		decompressRLE0(sprData, _resMan->readUint32(&frameHead->compSize), _rleBuffer);
		sprData = _rleBuffer;
	} else if (frameHead->runTimeComp[1] == 'I') { // new type
		tonyBuf = (uint8*)malloc(_resMan->readUint16(&frameHead->width) * _resMan->readUint16(&frameHead->height));
		decompressTony(sprData, _resMan->readUint32(&frameHead->compSize), tonyBuf);
		sprData = tonyBuf;
	}

	uint16 sprSizeX, sprSizeY;
	if (compact->o_status & STAT_SHRINK) {
		sprSizeX = (scale * _resMan->readUint16(&frameHead->width)) / 256;
		sprSizeY = (scale * _resMan->readUint16(&frameHead->height)) / 256;
		fastShrink(sprData, _resMan->readUint16(&frameHead->width), _resMan->readUint16(&frameHead->height), scale, _shrinkBuffer);
		sprData = _shrinkBuffer;
	} else {
		sprSizeX = _resMan->readUint16(&frameHead->width);
		sprSizeY = _resMan->readUint16(&frameHead->height);
	}
	if (!(compact->o_status & STAT_OVERRIDE)) {
		//mouse size linked to exact size & coordinates of sprite box - shrink friendly
		if (_resMan->readUint16(&frameHead->offsetX) || _resMan->readUint16(&frameHead->offsetY)) {
			//for megas the mouse area is reduced to account for sprite not
			//filling the box size is reduced to 1/2 width, 4/5 height
			compact->o_mouse_x1 = spriteX + sprSizeX / 4;
			compact->o_mouse_x2 = spriteX + (3 * sprSizeX) / 4;
			compact->o_mouse_y1 = spriteY + sprSizeY / 10;
			compact->o_mouse_y2 = spriteY + (9 * sprSizeY) / 10;
		} else {
			compact->o_mouse_x1 = spriteX;
			compact->o_mouse_x2 = spriteX + sprSizeX;
			compact->o_mouse_y1 = spriteY;
			compact->o_mouse_y2 = spriteY + sprSizeY;
		}
	}
	uint16 sprPitch = sprSizeX;
	uint16 incr;
	spriteClipAndSet(&spriteX, &spriteY, &sprSizeX, &sprSizeY, &incr);
	if ((sprSizeX > 0) && (sprSizeY > 0)) {
		drawSprite(sprData + incr, spriteX, spriteY, sprSizeX, sprSizeY, sprPitch);
		if (!(compact->o_status&STAT_FORE))
			verticalMask(spriteX, spriteY, sprSizeX, sprSizeY);
	}
	if (compact->o_type != TYPE_TEXT)
		_resMan->resClose(compact->o_resource);
	if (tonyBuf)
		free(tonyBuf);
}

void Screen::verticalMask(uint16 x, uint16 y, uint16 bWidth, uint16 bHeight) {
	if (_roomDefTable[_currentScreen].totalLayers <= 1)
		return;

	bWidth = (bWidth + (x & (SCRNGRID_X - 1)) + (SCRNGRID_X - 1)) / SCRNGRID_X;
	bHeight = (bHeight + (y & (SCRNGRID_Y - 1)) + (SCRNGRID_Y - 1)) / SCRNGRID_Y;

	x /= SCRNGRID_X;
	y /= SCRNGRID_Y;
	if (x + bWidth > _gridSizeX)
		bWidth = _gridSizeX - x;
	if (y + bHeight > _gridSizeY)
		bHeight = _gridSizeY - y;

	uint16 gridY = y + SCREEN_TOP_EDGE / SCRNGRID_Y; // imaginary screen on top
	gridY += bHeight - 1; // we start from the bottom edge
	uint16 gridX = x + SCREEN_LEFT_EDGE / SCRNGRID_X; // imaginary screen left
	uint16 lGridSizeX = _gridSizeX + 2 * (SCREEN_LEFT_EDGE / SCRNGRID_X); // width of the grid for the imaginary screen

	for (uint16 blkx = 0; blkx < bWidth; blkx++) {
		// A sprite can be masked by several layers at the same time,
		// so we have to check them all. See bug #917427.
		for (int16 level = _roomDefTable[_currentScreen].totalLayers - 2; level >= 0; level--) {
			if (_layerGrid[level][gridX + blkx + gridY * lGridSizeX]) {
				uint16 *grid = _layerGrid[level] + gridX + blkx + gridY * lGridSizeX;
				for (int16 blky = bHeight - 1; blky >= 0; blky--) {
					if (*grid) {
						uint8 *blkData = _layerBlocks[level + 1] + (_resMan->readUint16(grid) - 1) * 128;
						blitBlockClear(x + blkx, y + blky, blkData);
					} else
						break;
					grid -= lGridSizeX;
				}
			}
		}
	}
}

void Screen::blitBlockClear(uint16 x, uint16 y, uint8 *data) {
	uint8 *dest = _screenBuf + (y * SCRNGRID_Y) * _scrnSizeX + (x * SCRNGRID_X);
	for (uint8 cnty = 0; cnty < SCRNGRID_Y; cnty++) {
		for (uint8 cntx = 0; cntx < SCRNGRID_X; cntx++)
			if (data[cntx])
				dest[cntx] = data[cntx];
		data += SCRNGRID_X;
		dest += _scrnSizeX;
	}
}

void Screen::renderParallax(uint8 *data) {
	ParallaxHeader *header = (ParallaxHeader*)data;
	uint32 *lineIndexes = (uint32*)(data + sizeof(ParallaxHeader));
	assert((_resMan->getUint16(header->sizeX) >= SCREEN_WIDTH) && (_resMan->getUint16(header->sizeY) >= SCREEN_DEPTH));

	uint16 paraScrlX, paraScrlY;
	uint16 scrnScrlX, scrnScrlY;
	uint16 scrnWidth, scrnHeight;

	// we have to render more than the visible screen part for displaying scroll frames
	scrnScrlX = MIN((uint32)_oldScrollX, Logic::_scriptVars[SCROLL_OFFSET_X]);
	scrnWidth = SCREEN_WIDTH + ABS((int32)_oldScrollX - (int32)Logic::_scriptVars[SCROLL_OFFSET_X]);
	scrnScrlY = MIN((uint32)_oldScrollY, Logic::_scriptVars[SCROLL_OFFSET_Y]);
	scrnHeight = SCREEN_DEPTH + ABS((int32)_oldScrollY - (int32)Logic::_scriptVars[SCROLL_OFFSET_Y]);

	if (_scrnSizeX != SCREEN_WIDTH) {
		double scrlfx = (_resMan->getUint16(header->sizeX) - SCREEN_WIDTH) / ((double)(_scrnSizeX - SCREEN_WIDTH));
		paraScrlX = (uint16)(scrnScrlX * scrlfx);
	} else
		paraScrlX = 0;

	if (_scrnSizeY != SCREEN_DEPTH) {
		double scrlfy = (_resMan->getUint16(header->sizeY) - SCREEN_DEPTH) / ((double)(_scrnSizeY - SCREEN_DEPTH));
		paraScrlY = (uint16)(scrnScrlY * scrlfy);
	} else
		paraScrlY = 0;

	for (uint16 cnty = 0; cnty < scrnHeight; cnty++) {
		uint8 *src = data + _resMan->readUint32(lineIndexes + cnty + paraScrlY);
		uint8 *dest = _screenBuf + scrnScrlX + (cnty + scrnScrlY) * _scrnSizeX;
		uint16 remain = paraScrlX;
		uint16 xPos = 0;
		while (remain) { // skip past the first part of the parallax to get to the right scrolling position
			uint8 doSkip = *src++;
			if (doSkip <= remain)
				remain -= doSkip;
			else {
				xPos = doSkip - remain;
				dest += xPos;
				remain = 0;
			}
			uint8 doCopy = *src++;
			if (doCopy <= remain) {
				remain -= doCopy;
				src += doCopy;
			} else {
				uint16 remCopy = doCopy - remain;
				memcpy(dest, src + remain, remCopy);
				dest += remCopy;
				src += doCopy;
				xPos = remCopy;
				remain = 0;
			}
		}
		while (xPos < scrnWidth) {
			if (uint8 skip = *src++) {
				dest += skip;
				xPos += skip;
			}
			if (xPos < scrnWidth) {
				if (uint8 doCopy = *src++) {
					if (xPos + doCopy > scrnWidth)
						doCopy = scrnWidth - xPos;
					memcpy(dest, src, doCopy);
					dest += doCopy;
					xPos += doCopy;
					src += doCopy;
				}
			}
		}
	}
}

void Screen::drawSprite(uint8 *sprData, uint16 sprX, uint16 sprY, uint16 sprWidth, uint16 sprHeight, uint16 sprPitch) {
	uint8 *dest = _screenBuf + (sprY * _scrnSizeX) + sprX;

	for (uint16 cnty = 0; cnty < sprHeight; cnty++) {
		for (uint16 cntx = 0; cntx < sprWidth; cntx++)
			if (sprData[cntx])
				dest[cntx] = sprData[cntx];
		sprData += sprPitch;
		dest += _scrnSizeX;
	}
}

// nearest neighbor filter:
void Screen::fastShrink(uint8 *src, uint32 width, uint32 height, uint32 scale, uint8 *dest) {
	uint32 resHeight = (height * scale) >> 8;
	uint32 resWidth = (width * scale) >> 8;
	uint32 step = 0x10000 / scale;
	uint8 columnTab[160];
	uint32 res = step >> 1;
	for (uint16 cnt = 0; cnt < resWidth; cnt++) {
		columnTab[cnt] = (uint8)(res >> 8);
		res += step;
	}

	uint32 newRow = step >> 1;
	uint32 oldRow = 0;

	uint8 *destPos = dest;
	uint16 lnCnt;
	for (lnCnt = 0; lnCnt < resHeight; lnCnt++) {
		while (oldRow < (newRow >> 8)) {
			oldRow++;
			src += width;
		}
		for (uint16 colCnt = 0; colCnt < resWidth; colCnt++) {
			*destPos++ = src[columnTab[colCnt]];
		}
		newRow += step;
	}
	// scaled, now stipple shadows if there are any
	for (lnCnt = 0; lnCnt < resHeight; lnCnt++) {
		uint16 xCnt = lnCnt & 1;
		destPos = dest + lnCnt * resWidth + (lnCnt & 1);
		while (xCnt < resWidth) {
			if (*destPos == 200)
				*destPos = 0;
			destPos += 2;
			xCnt += 2;
		}
	}
}

void Screen::addToGraphicList(uint8 listId, uint32 objId) {
	if (listId == 0) {
		assert(_foreLength < MAX_FORE);
		_foreList[_foreLength++] = objId;
	}
	if (listId == 1) {
		assert(_sortLength < MAX_SORT);
		Object *cpt = _objMan->fetchObject(objId);
		_sortList[_sortLength].id = objId;
		_sortList[_sortLength].y = cpt->o_anim_y; // gives feet coords if boxed mega, otherwise top of sprite box
		if (!(cpt->o_status & STAT_SHRINK)) {     // not a boxed mega using shrinking
			Header *frameRaw = (Header*)_resMan->openFetchRes(cpt->o_resource);
			FrameHeader *frameHead = _resMan->fetchFrame(frameRaw, cpt->o_frame);
			_sortList[_sortLength].y += _resMan->readUint16(&frameHead->height) - 1; // now pointing to base of sprite
			_resMan->resClose(cpt->o_resource);
		}
		_sortLength++;
	}
	if (listId == 2) {
		assert(_backLength < MAX_BACK);
		_backList[_backLength++] = objId;
	}
}

void Screen::decompressTony(uint8 *src, uint32 compSize, uint8 *dest) {
	uint8 *endOfData = src + compSize;
	while (src < endOfData) {
		uint8 numFlat = *src++;
		if (numFlat) {
			memset(dest, *src, numFlat);
			src++;
			dest += numFlat;
		}
		if (src < endOfData) {
			uint8 numNoFlat = *src++;
			memcpy(dest, src, numNoFlat);
			src += numNoFlat;
			dest += numNoFlat;
		}
	}
}

void Screen::decompressRLE7(uint8 *src, uint32 compSize, uint8 *dest) {
	uint8 *compBufEnd = src + compSize;
	while (src < compBufEnd) {
		uint8 code = *src++;
		if ((code > 127) || (code == 0))
			*dest++ = code;
		else {
			code++;
			memset(dest, *src++, code);
			dest += code;
		}
	}
}

void Screen::decompressRLE0(uint8 *src, uint32 compSize, uint8 *dest) {
	uint8 *srcBufEnd = src + compSize;
	while (src < srcBufEnd) {
		uint8 color = *src++;
		if (color) {
			*dest++ = color;
		} else {
			uint8 skip = *src++;
			memset(dest, 0, skip);
			dest += skip;
		}
	}
}

void Screen::fadePalette(void) {
	if (_fadingStep == 16)
		memcpy(_currentPalette, _targetPalette, 256 * 4);
	else if ((_fadingStep == 1) && (_fadingDirection == FADE_DOWN)) {
		memset(_currentPalette, 0, 4 * 256);
	} else
		for (uint16 cnt = 0; cnt < 256 * 4; cnt++)
			_currentPalette[cnt] = (_targetPalette[cnt] * _fadingStep) >> 4;

	_fadingStep += _fadingDirection;
	if (_fadingStep == 17) {
		_fadingStep = 0;
		_isBlack = false;
	} else if (_fadingStep == 0)
		_isBlack = true;
}

void Screen::fnSetParallax(uint32 screen, uint32 resId) {
	_roomDefTable[screen].parallax[0] = resId;
}

void Screen::spriteClipAndSet(uint16 *pSprX, uint16 *pSprY, uint16 *pSprWidth, uint16 *pSprHeight, uint16 *incr) {
	int16 sprX = *pSprX - SCREEN_LEFT_EDGE;
	int16 sprY = *pSprY - SCREEN_TOP_EDGE;
	int16 sprW = *pSprWidth;
	int16 sprH = *pSprHeight;

	if (sprY < 0) {
		*incr = (uint16)((-sprY) * sprW);
		sprH += sprY;
		sprY = 0;
	} else
		*incr = 0;
	if (sprX < 0) {
		*incr -= sprX;
		sprW += sprX;
		sprX = 0;
	}

	if (sprY + sprH > _scrnSizeY)
		sprH = _scrnSizeY - sprY;
	if (sprX + sprW > _scrnSizeX)
		sprW = _scrnSizeX - sprX;

	if (sprH < 0)
		*pSprHeight = 0;
	else
		*pSprHeight = (uint16)sprH;
	if (sprW < 0)
		*pSprWidth = 0;
	else
		*pSprWidth = (uint16)sprW;
	*pSprX = (uint16)sprX;
	*pSprY = (uint16)sprY;

	if (*pSprWidth && *pSprHeight) {
		// sprite will be drawn, so mark it in the grid buffer
		uint16 gridH = (*pSprHeight + (sprY & (SCRNGRID_Y - 1)) + (SCRNGRID_Y - 1)) / SCRNGRID_Y;
		uint16 gridW = (*pSprWidth +  (sprX & (SCRNGRID_X - 1)) + (SCRNGRID_X - 1)) / SCRNGRID_X;
		uint16 gridX = sprX / SCRNGRID_X;
		uint16 gridY = sprY / SCRNGRID_Y;
		uint8 *gridBuf = _screenGrid + gridX + gridY * _gridSizeX;
		if (gridX + gridW > _gridSizeX)
			gridW = _gridSizeX - gridX;
		if (gridY + gridH > _gridSizeY)
			gridH = _gridSizeY - gridY;

		for (uint16 cnty = 0; cnty < gridH; cnty++) {
			for (uint16 cntx = 0; cntx < gridW; cntx++)
				gridBuf[cntx] = 2;
			gridBuf += _gridSizeX;
		}
	}
}

void Screen::fnFlash(uint8 color) {
	warning("stub: Screen::fnFlash(%d)", color);
}

// ------------------- Menu screen interface ---------------------------

void Screen::showFrame(uint16 x, uint16 y, uint32 resId, uint32 frameNo, const byte *fadeMask, int8 fadeStatus) {
	uint8 frame[40 * 40];
	int i, j;

	memset(frame, 199, sizeof(frame));	// Dark gray background

	if (resId != 0xffffffff) {
		FrameHeader *frameHead = _resMan->fetchFrame(_resMan->openFetchRes(resId), frameNo);
		uint8 *frameData = ((uint8*)frameHead) + sizeof(FrameHeader);

		for (i = 0; i < _resMan->getUint16(frameHead->height); i++) {
			for (j = 0; j < _resMan->getUint16(frameHead->height); j++) {
				frame[(i + 4) * 40 + j + 2] = frameData[i * _resMan->getUint16(frameHead->width) + j];
			}
		}

		_resMan->resClose(resId);
	}

	if (fadeMask) {
		for (i = 0; i < 40; i++) {
			for (j = 0; j < 40; j++) {
				if (fadeMask[((i % 8) * 8) + (j % 8)] >= fadeStatus)
					frame[i * 40 + j] = 0;
			}
		}
	}

	_system->copyRectToScreen(frame, 40, x, y, 40, 40);
}

// ------------------- router debugging code --------------------------------

void Screen::vline(uint16 x, uint16 y1, uint16 y2) {
	for (uint16 cnty = y1; cnty <= y2; cnty++)
		_screenBuf[x + _scrnSizeX * cnty] = 0;
}

void Screen::hline(uint16 x1, uint16 x2, uint16 y) {
	for (uint16 cntx = x1; cntx <= x2; cntx++)
		_screenBuf[y * _scrnSizeX + cntx] = 0;
}

void Screen::bsubline_1(uint16 x1, uint16 y1, uint16 x2, uint16 y2) {
	int x, y, ddx, ddy, e;
	ddx = ABS(x2 - x1);
	ddy = ABS(y2 - y1) << 1;
	e = ddx - ddy;
	ddx <<= 1;

	if (x1 > x2) {
		uint16 tmp;
		tmp = x1; x1 = x2; x2 = tmp;
		tmp = y1; y1 = y2; y2 = tmp;
	}

	for (x = x1, y = y1; x <= x2; x++) {
		_screenBuf[y * _scrnSizeX + x] = 0;
		if (e < 0) {
			y++;
			e += ddx - ddy;
		} else {
			e -= ddy;
		}
	}
}

void Screen::bsubline_2(uint16 x1, uint16 y1, uint16 x2, uint16 y2) {
	int x, y, ddx, ddy, e;
	ddx = ABS(x2 - x1) << 1;
	ddy = ABS(y2 - y1);
	e = ddy - ddx;
	ddy <<= 1;

	if (y1 > y2) {
		uint16 tmp;
		tmp = x1; x1 = x2; x2 = tmp;
		tmp = y1; y1 = y2; y2 = tmp;
	}

	for (y = y1, x = x1; y <= y2; y++) {
		_screenBuf[y * _scrnSizeX + x] = 0;
		if (e < 0) {
			x++;
			e += ddy - ddx;
		} else {
			e -= ddx;
		}
	}
}

void Screen::bsubline_3(uint16 x1, uint16 y1, uint16 x2, uint16 y2) {
	int x, y, ddx, ddy, e;
	ddx = ABS(x1 - x2) << 1;
	ddy = ABS(y2 - y1);
	e = ddy - ddx;
	ddy <<= 1;

	if (y1 > y2) {
		uint16 tmp;
		tmp = x1; x1 = x2; x2 = tmp;
		tmp = y1; y1 = y2; y2 = tmp;
	}

	for (y = y1, x = x1; y <= y2; y++) {
		_screenBuf[y * _scrnSizeX + x] = 0;
		if (e < 0) {
			x--;
			e += ddy - ddx;
		} else {
			e -= ddx;
		}
	}
}

void Screen::bsubline_4(uint16 x1, uint16 y1, uint16 x2, uint16 y2) {
	int x, y, ddx, ddy, e;
	ddy = ABS(y2 - y1) << 1;
	ddx = ABS(x1 - x2);
	e = ddx - ddy;
	ddx <<= 1;

	if (x1 > x2) {
		uint16 tmp;
		tmp = x1; x1 = x2; x2 = tmp;
		tmp = y1; y1 = y2; y2 = tmp;
	}

	for (x = x1, y = y1; x <= x2; x++) {
		_screenBuf[y * _scrnSizeX + x] = 0;
		if (e < 0) {
			y--;
			e += ddx - ddy;
		} else {
			e -= ddy;
		}
	}
}

void Screen::drawLine(uint16 x1, uint16 y1, uint16 x2, uint16 y2) {
	if ((x1 == x2) && (y1 == y2)) {
		_screenBuf[x1 + y1 * _scrnSizeX] = 0;
	}
	if (x1 == x2) {
		vline(x1, MIN(y1, y2), MAX(y1, y2));
		return;
	}

	if (y1 == y2) {
		hline(MIN(x1, x2), MAX(x1, x2), y1);
		return;
	}

	float k = float(y2 - y1) / float(x2 - x1);

	if ((k >= 0) && (k <= 1)) {
		bsubline_1(x1, y1, x2, y2);
	} else if (k > 1) {
		bsubline_2(x1, y1, x2, y2);
	} else if ((k < 0) && (k >= -1)) {
		bsubline_4(x1, y1, x2, y2);
	} else {
		bsubline_3(x1, y1, x2, y2);
	}
}

#ifdef BACKEND_8BIT
void Screen::plotYUV(byte *lut, int width, int height, byte *const *dat) {

	byte * buf = (uint8*)malloc(width * height);

	int x, y;

	int ypos = 0;
	int cpos = 0;
	int linepos = 0;

	for (y = 0; y < height; y += 2) {
		for (x = 0; x < width; x += 2) {
			int i = ((((dat[2][cpos] + ROUNDADD) >> SHIFT) * (BITDEPTH+1)) + ((dat[1][cpos] + ROUNDADD)>>SHIFT)) * (BITDEPTH+1);
			cpos++;

			buf[linepos          ] = lut[i + ((dat[0][        ypos  ] + ROUNDADD) >> SHIFT)];
			buf[width + linepos++] = lut[i + ((dat[0][width + ypos++] + ROUNDADD) >> SHIFT)];
			buf[linepos          ] = lut[i + ((dat[0][        ypos  ] + ROUNDADD) >> SHIFT)];
			buf[width + linepos++] = lut[i + ((dat[0][width + ypos++] + ROUNDADD) >> SHIFT)];
		}
		linepos += (2 * width - width);
		ypos += width;
	}

	_system->copyRectToScreen(buf, width, (640-width)/2, (480-height)/2, width, height);
	_system->updateScreen();

	free(buf);

}
#endif



} // End of namespace Sword1