aboutsummaryrefslogtreecommitdiff
path: root/engines/sci/graphics/transitions.cpp
blob: 78f465ca3ab0e1091faf3e56be62e01529694fee (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
/* 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.
 *
 */

#include "common/events.h"
#include "common/system.h"
#include "graphics/palette.h"
#include "graphics/surface.h"

#include "sci/sci.h"
#include "sci/engine/state.h"
#include "sci/graphics/screen.h"
#include "sci/graphics/palette.h"
#include "sci/graphics/transitions.h"

namespace Sci {

//#define DISABLE_TRANSITIONS	// uncomment to disable room transitions (for development only! helps in testing games quickly)

GfxTransitions::GfxTransitions(GfxScreen *screen, GfxPalette *palette)
	: _screen(screen), _palette(palette) {
	init();
}

GfxTransitions::~GfxTransitions() {
	delete[] _oldScreen;
}

// This table contains a mapping between oldIDs (prior SCI1LATE) and newIDs
static const GfxTransitionTranslateEntry oldTransitionIDs[] = {
	{   0, SCI_TRANSITIONS_VERTICALROLL_FROMCENTER,		false },
	{   1, SCI_TRANSITIONS_HORIZONTALROLL_FROMCENTER,	false },
	{   2, SCI_TRANSITIONS_STRAIGHT_FROM_RIGHT,			false },
	{   3, SCI_TRANSITIONS_STRAIGHT_FROM_LEFT,			false },
	{   4, SCI_TRANSITIONS_STRAIGHT_FROM_BOTTOM,		false },
	{   5, SCI_TRANSITIONS_STRAIGHT_FROM_TOP,			false },
	{   6, SCI_TRANSITIONS_DIAGONALROLL_TOCENTER,		false },
	{   7, SCI_TRANSITIONS_DIAGONALROLL_FROMCENTER,		false },
	{   8, SCI_TRANSITIONS_BLOCKS,						false },
	{   9, SCI_TRANSITIONS_VERTICALROLL_TOCENTER,		false },
	{  10, SCI_TRANSITIONS_HORIZONTALROLL_TOCENTER,		false },
	{  11, SCI_TRANSITIONS_STRAIGHT_FROM_RIGHT,			true },
	{  12, SCI_TRANSITIONS_STRAIGHT_FROM_LEFT,			true },
	{  13, SCI_TRANSITIONS_STRAIGHT_FROM_BOTTOM,		true },
	{  14, SCI_TRANSITIONS_STRAIGHT_FROM_TOP,			true },
	{  15, SCI_TRANSITIONS_DIAGONALROLL_FROMCENTER,		true },
	{  16, SCI_TRANSITIONS_DIAGONALROLL_TOCENTER,		true },
	{  17, SCI_TRANSITIONS_BLOCKS,						true },
	{  18, SCI_TRANSITIONS_PIXELATION,					false },
	{  27, SCI_TRANSITIONS_PIXELATION	,				true },
	{  30, SCI_TRANSITIONS_FADEPALETTE,					false },
	{  40, SCI_TRANSITIONS_SCROLL_RIGHT,				false },
	{  41, SCI_TRANSITIONS_SCROLL_LEFT,					false },
	{  42, SCI_TRANSITIONS_SCROLL_UP,					false },
	{  43, SCI_TRANSITIONS_SCROLL_DOWN,					false },
	{ 100, SCI_TRANSITIONS_NONE,						false },
	{ 255, 255,											false }
};

// this table defines the blackout-transition that needs to be done prior doing the actual transition
static const GfxTransitionTranslateEntry blackoutTransitionIDs[] = {
	{ SCI_TRANSITIONS_VERTICALROLL_FROMCENTER,			SCI_TRANSITIONS_VERTICALROLL_TOCENTER,		true },
	{ SCI_TRANSITIONS_HORIZONTALROLL_FROMCENTER,		SCI_TRANSITIONS_HORIZONTALROLL_TOCENTER,	true },
	{ SCI_TRANSITIONS_STRAIGHT_FROM_RIGHT,				SCI_TRANSITIONS_STRAIGHT_FROM_LEFT,			true },
	{ SCI_TRANSITIONS_STRAIGHT_FROM_LEFT,				SCI_TRANSITIONS_STRAIGHT_FROM_RIGHT,		true },
	{ SCI_TRANSITIONS_STRAIGHT_FROM_BOTTOM,				SCI_TRANSITIONS_STRAIGHT_FROM_TOP,			true },
	{ SCI_TRANSITIONS_STRAIGHT_FROM_TOP,				SCI_TRANSITIONS_STRAIGHT_FROM_BOTTOM,		true },
	{ SCI_TRANSITIONS_DIAGONALROLL_FROMCENTER,			SCI_TRANSITIONS_DIAGONALROLL_TOCENTER,		true },
	{ SCI_TRANSITIONS_DIAGONALROLL_TOCENTER,			SCI_TRANSITIONS_DIAGONALROLL_FROMCENTER,	true },
	{ SCI_TRANSITIONS_BLOCKS,							SCI_TRANSITIONS_BLOCKS,						true },
	{ SCI_TRANSITIONS_PIXELATION,						SCI_TRANSITIONS_PIXELATION,					true },
	{ SCI_TRANSITIONS_FADEPALETTE,						SCI_TRANSITIONS_NONE,						true },
	{ SCI_TRANSITIONS_SCROLL_RIGHT,						SCI_TRANSITIONS_NONE,						true },
	{ SCI_TRANSITIONS_SCROLL_LEFT,						SCI_TRANSITIONS_NONE,						true },
	{ SCI_TRANSITIONS_SCROLL_UP,						SCI_TRANSITIONS_NONE,						true },
	{ SCI_TRANSITIONS_SCROLL_DOWN,						SCI_TRANSITIONS_NONE,						true },
	{ SCI_TRANSITIONS_NONE_LONGBOW,						SCI_TRANSITIONS_NONE,						true },
	{ SCI_TRANSITIONS_NONE,								SCI_TRANSITIONS_NONE,						true },
	{ SCI_TRANSITIONS_VERTICALROLL_TOCENTER,			SCI_TRANSITIONS_NONE,						true },
	{ SCI_TRANSITIONS_HORIZONTALROLL_TOCENTER,			SCI_TRANSITIONS_NONE,						true },
	{ 255,												255,										true }
};

void GfxTransitions::init() {
	_oldScreen = new byte[_screen->getDisplayHeight() * _screen->getDisplayWidth()];

	if (getSciVersion() >= SCI_VERSION_1_LATE)
		_translationTable = NULL;
	else
		_translationTable = oldTransitionIDs;

	// setup default transition
	_number = SCI_TRANSITIONS_HORIZONTALROLL_FROMCENTER;
	_blackoutFlag = false;
}

void GfxTransitions::setup(int16 number, bool blackoutFlag) {
	if (number != -1) {
#ifndef DISABLE_TRANSITIONS
		_number = number;
#else
		_number = SCI_TRANSITIONS_NONE;
#endif
		_blackoutFlag = blackoutFlag;
		debugC(kDebugLevelGraphics, "Transition %d, blackout %d", number, blackoutFlag);
	}
}

// Checks, if current time is lower than expected time of the current frame
// If current time is higher, then we have to assume that the current system isn't capable
// of either rendering frames that fast or has 60hz V'Sync enabled, which is why we drop frames
// in those cases, so that transitions work as fast as expected.
bool GfxTransitions::doCreateFrame(uint32 shouldBeAtMsec) {
	uint32 msecPos = g_system->getMillis() - _transitionStartTime;

	if (shouldBeAtMsec > msecPos)
		return true;
	return false;
}

void GfxTransitions::updateScreen() {
	Common::Event ev;

	while (g_system->getEventManager()->pollEvent(ev)) {}	// discard all events

	g_system->updateScreen();
}

void GfxTransitions::updateScreenAndWait(uint32 shouldBeAtMsec) {
	updateScreen();
	// if we have still some time left, delay accordingly
	uint32 msecPos = g_system->getMillis() - _transitionStartTime;
	if (shouldBeAtMsec > msecPos)
		g_system->delayMillis(shouldBeAtMsec - msecPos);
}

// will translate a number and return corresponding translationEntry
const GfxTransitionTranslateEntry *GfxTransitions::translateNumber (int16 number, const GfxTransitionTranslateEntry *tablePtr) {
	while (1) {
		if (tablePtr->orgId == 255)
			return NULL;
		if (tablePtr->orgId == number)
			return tablePtr;
		tablePtr++;
	}
}

void GfxTransitions::doit(Common::Rect picRect) {
	const GfxTransitionTranslateEntry *translationEntry = _translationTable;

	_picRect = picRect;

	if (_translationTable) {
		// We need to translate the ID
		translationEntry = translateNumber(_number, _translationTable);
		if (translationEntry) {
			_number = translationEntry->newId;
			_blackoutFlag = translationEntry->blackoutFlag;
		} else {
			warning("Transitions: old ID %d not supported", _number);
			_number = SCI_TRANSITIONS_NONE;
			_blackoutFlag = false;
		}
	}

	if (_blackoutFlag) {
		// We need to find out what transition we are supposed to use for
		// blackout
		translationEntry = translateNumber(_number, blackoutTransitionIDs);
		if (translationEntry) {
			doTransition(translationEntry->newId, true);
		} else {
			warning("Transitions: ID %d not listed in blackoutTransitionIDs", _number);
		}
	}

	_palette->palVaryPrepareForTransition();

	// Now we do the actual transition to the new screen
	doTransition(_number, false);

	_screen->_picNotValid = 0;
}

// This may get called twice, if blackoutFlag is set. It will get once called
// with blackoutFlag set and another time with no blackoutFlag.
void GfxTransitions::doTransition(int16 number, bool blackoutFlag) {
	if (number != SCI_TRANSITIONS_FADEPALETTE) {
		setNewPalette(blackoutFlag);
	}

	_transitionStartTime = g_system->getMillis();
	switch (number) {
	case SCI_TRANSITIONS_VERTICALROLL_FROMCENTER:
		verticalRollFromCenter(blackoutFlag);
		break;
	case SCI_TRANSITIONS_VERTICALROLL_TOCENTER:
		verticalRollToCenter(blackoutFlag);
		break;
	case SCI_TRANSITIONS_HORIZONTALROLL_FROMCENTER:
		horizontalRollFromCenter(blackoutFlag);
		break;
	case SCI_TRANSITIONS_HORIZONTALROLL_TOCENTER:
		horizontalRollToCenter(blackoutFlag);
		break;
	case SCI_TRANSITIONS_DIAGONALROLL_TOCENTER:
		diagonalRollToCenter(blackoutFlag);
		break;
	case SCI_TRANSITIONS_DIAGONALROLL_FROMCENTER:
		diagonalRollFromCenter(blackoutFlag);
		break;

	case SCI_TRANSITIONS_STRAIGHT_FROM_RIGHT:
	case SCI_TRANSITIONS_STRAIGHT_FROM_LEFT:
	case SCI_TRANSITIONS_STRAIGHT_FROM_BOTTOM:
	case SCI_TRANSITIONS_STRAIGHT_FROM_TOP:
		straight(number, blackoutFlag);
		break;

	case SCI_TRANSITIONS_PIXELATION:
		pixelation(blackoutFlag);
		break;

	case SCI_TRANSITIONS_BLOCKS:
		blocks(blackoutFlag);
		break;

	case SCI_TRANSITIONS_FADEPALETTE:
		if (!blackoutFlag) {
			fadeOut(); setNewScreen(blackoutFlag); fadeIn();
		}
		break;

	case SCI_TRANSITIONS_SCROLL_RIGHT:
	case SCI_TRANSITIONS_SCROLL_LEFT:
	case SCI_TRANSITIONS_SCROLL_UP:
	case SCI_TRANSITIONS_SCROLL_DOWN:
		scroll(number);
		break;

	case SCI_TRANSITIONS_NONE_LONGBOW:
	case SCI_TRANSITIONS_NONE:
		setNewScreen(blackoutFlag);
		break;

	default:
		warning("Transitions: ID %d not implemented", number);
		setNewScreen(blackoutFlag);
	}
	// Just to make sure that the current frame is shown in case we skipped the last update-call b/c of timing
	updateScreen();
	debugC(kDebugLevelGraphics, "Transition took %d milliseconds", g_system->getMillis() - _transitionStartTime);
}

void GfxTransitions::setNewPalette(bool blackoutFlag) {
	if (!blackoutFlag)
		_palette->setOnScreen();
}

void GfxTransitions::setNewScreen(bool blackoutFlag) {
	if (!blackoutFlag) {
		_screen->copyRectToScreen(_picRect);
		g_system->updateScreen();
	}
}

void GfxTransitions::copyRectToScreen(const Common::Rect rect, bool blackoutFlag) {
	if (!blackoutFlag) {
		_screen->copyRectToScreen(rect);
	} else {
		Graphics::Surface *surface = g_system->lockScreen();
		if (!_screen->getUpscaledHires()) {
			surface->fillRect(rect, 0);
		} else {
			Common::Rect upscaledRect = rect;
			_screen->adjustToUpscaledCoordinates(upscaledRect.top, upscaledRect.left);
			_screen->adjustToUpscaledCoordinates(upscaledRect.bottom, upscaledRect.right);
			surface->fillRect(upscaledRect, 0);
		}
		g_system->unlockScreen();
	}
}

// Note: don't do too many steps in here, otherwise cpu will crap out because of
// the load
void GfxTransitions::fadeOut() {
	byte oldPalette[3 * 256], workPalette[3 * 256];
	int16 stepNr, colorNr;
	// Sierra did not fade in/out color 255 for sci1.1, but they used it in
	//  several pictures (e.g. qfg3 demo/intro), so the fading looked weird
	int16 tillColorNr = getSciVersion() >= SCI_VERSION_1_1 ? 255 : 254;

	g_system->getPaletteManager()->grabPalette(oldPalette, 0, 256);

	for (stepNr = 100; stepNr >= 0; stepNr -= 10) {
		for (colorNr = 1; colorNr <= tillColorNr; colorNr++) {
			if (_palette->colorIsFromMacClut(colorNr)) {
				workPalette[colorNr * 3 + 0] = oldPalette[colorNr * 3];
				workPalette[colorNr * 3 + 1] = oldPalette[colorNr * 3 + 1];
				workPalette[colorNr * 3 + 2] = oldPalette[colorNr * 3 + 2];
			} else {
				workPalette[colorNr * 3 + 0] = oldPalette[colorNr * 3] * stepNr / 100;
				workPalette[colorNr * 3 + 1] = oldPalette[colorNr * 3 + 1] * stepNr / 100;
				workPalette[colorNr * 3 + 2] = oldPalette[colorNr * 3 + 2] * stepNr / 100;
			}
		}
		g_system->getPaletteManager()->setPalette(workPalette + 3, 1, tillColorNr);
		g_sci->getEngineState()->sleep(2);
	}
}

// Note: don't do too many steps in here, otherwise cpu will crap out because of
// the load
void GfxTransitions::fadeIn() {
	int16 stepNr;
	// Sierra did not fade in/out color 255 for sci1.1, but they used it in
	//  several pictures (e.g. qfg3 demo/intro), so the fading looked weird
	int16 tillColorNr = getSciVersion() >= SCI_VERSION_1_1 ? 255 : 254;

	for (stepNr = 0; stepNr <= 100; stepNr += 10) {
		_palette->kernelSetIntensity(1, tillColorNr + 1, stepNr, true);
		g_sci->getEngineState()->sleep(2);
	}
}

// Pixelates the new picture over the old one - works against the whole screen.
// TODO: it seems this needs to get applied on _picRect only if possible
void GfxTransitions::pixelation(bool blackoutFlag) {
	uint16 mask = 0x40, stepNr = 0;
	Common::Rect pixelRect;
	uint32 msecCount = 0;

	do {
		mask = (mask & 1) ? (mask >> 1) ^ 0xB400 : mask >> 1;
		if (mask >= _screen->getScriptWidth() * _screen->getScriptHeight())
			continue;
		pixelRect.left = mask % _screen->getScriptWidth(); pixelRect.right = pixelRect.left + 1;
		pixelRect.top = mask / _screen->getScriptWidth();	pixelRect.bottom = pixelRect.top + 1;
		pixelRect.clip(_picRect);
		if (!pixelRect.isEmpty())
			copyRectToScreen(pixelRect, blackoutFlag);
		if ((stepNr & 0x3FF) == 0) {
			msecCount += 9;
			if (doCreateFrame(msecCount)) {
				updateScreenAndWait(msecCount);
			}
		}
		stepNr++;
	} while (mask != 0x40);
}

// Like pixelation but uses 8x8 blocks - works against the whole screen.
// TODO: it seems this needs to get applied on _picRect only if possible
void GfxTransitions::blocks(bool blackoutFlag) {
	uint16 mask = 0x40, stepNr = 0;
	Common::Rect blockRect;
	uint32 msecCount = 0;

	do {
		mask = (mask & 1) ? (mask >> 1) ^ 0x240 : mask >> 1;
		if (mask >= 40 * 25)
			continue;
		blockRect.left = (mask % 40) << 3; blockRect.right = blockRect.left + 8;
		blockRect.top = (mask / 40) << 3; blockRect.bottom = blockRect.top + 8;
		blockRect.clip(_picRect);
		if (!blockRect.isEmpty())
			copyRectToScreen(blockRect, blackoutFlag);
		if ((stepNr & 7) == 0) {
			msecCount += 5;
			if (doCreateFrame(msecCount)) {
				updateScreenAndWait(msecCount);
			}
		}
		stepNr++;
	} while (mask != 0x40);
}

// Directly shows new screen starting up/down/left/right and going to the
// opposite direction - works on _picRect area only
void GfxTransitions::straight(int16 number, bool blackoutFlag) {
	int16 stepNr = 0;
	Common::Rect newScreenRect = _picRect;
	uint32 msecCount = 0;

	switch (number) {
	case SCI_TRANSITIONS_STRAIGHT_FROM_RIGHT:
		newScreenRect.left = newScreenRect.right - 1;
		while (newScreenRect.left >= _picRect.left) {
			copyRectToScreen(newScreenRect, blackoutFlag);
			if ((stepNr & 1) == 0) {
				msecCount += 2;
				if (doCreateFrame(msecCount)) {
					updateScreenAndWait(msecCount);
				}
			}
			stepNr++;
			newScreenRect.translate(-1, 0);
		}
		break;

	case SCI_TRANSITIONS_STRAIGHT_FROM_LEFT:
		newScreenRect.right = newScreenRect.left + 1;
		while (newScreenRect.right <= _picRect.right) {
			copyRectToScreen(newScreenRect, blackoutFlag);
			if ((stepNr & 1) == 0) {
				msecCount += 2;
				if (doCreateFrame(msecCount)) {
					updateScreenAndWait(msecCount);
				}
			}
			stepNr++;
			newScreenRect.translate(1, 0);
		}
		break;

	case SCI_TRANSITIONS_STRAIGHT_FROM_BOTTOM:
		newScreenRect.top = newScreenRect.bottom - 1;
		while (newScreenRect.top >= _picRect.top) {
			copyRectToScreen(newScreenRect, blackoutFlag);
			msecCount += 4;
			if (doCreateFrame(msecCount)) {
				updateScreenAndWait(msecCount);
			}
			stepNr++;
			newScreenRect.translate(0, -1);
		}
		break;

	case SCI_TRANSITIONS_STRAIGHT_FROM_TOP:
		newScreenRect.bottom = newScreenRect.top + 1;
		while (newScreenRect.bottom <= _picRect.bottom) {
			copyRectToScreen(newScreenRect, blackoutFlag);
			msecCount += 4;
			if (doCreateFrame(msecCount)) {
				updateScreenAndWait(msecCount);
			}
			stepNr++;
			newScreenRect.translate(0, 1);
		}
		break;
	}
}

void GfxTransitions::scrollCopyOldToScreen(Common::Rect screenRect, int16 x, int16 y) {
	byte *oldScreenPtr = _oldScreen;
	int16 screenWidth = _screen->getDisplayWidth();
	if (_screen->getUpscaledHires()) {
		_screen->adjustToUpscaledCoordinates(screenRect.top, screenRect.left);
		_screen->adjustToUpscaledCoordinates(screenRect.bottom, screenRect.right);
		_screen->adjustToUpscaledCoordinates(y, x);
	}
	oldScreenPtr += screenRect.left + screenRect.top * screenWidth;
	g_system->copyRectToScreen(oldScreenPtr, screenWidth, x, y, screenRect.width(), screenRect.height());
}

// Scroll old screen (up/down/left/right) and insert new screen that way - works
// on _picRect area only.
void GfxTransitions::scroll(int16 number) {
	int16 stepNr = 0;
	Common::Rect oldMoveRect = _picRect;
	Common::Rect oldScreenRect = _picRect;
	Common::Rect newMoveRect = _picRect;
	Common::Rect newScreenRect = _picRect;
	uint32 msecCount = 0;

	_screen->copyFromScreen(_oldScreen);

	switch (number) {
	case SCI_TRANSITIONS_SCROLL_LEFT:
		newScreenRect.right = newScreenRect.left;
		newMoveRect.left = newMoveRect.right;
		while (oldMoveRect.left < oldMoveRect.right) {
			oldMoveRect.right--; oldScreenRect.left++;
			newScreenRect.right++; newMoveRect.left--;
			if ((stepNr & 1) == 0) {
				msecCount += 5;
				if (doCreateFrame(msecCount)) {
					if (oldMoveRect.right > oldMoveRect.left)
						scrollCopyOldToScreen(oldScreenRect, oldMoveRect.left, oldMoveRect.top);
					_screen->copyRectToScreen(newScreenRect, newMoveRect.left, newMoveRect.top);
					updateScreenAndWait(msecCount);
				}
			}
			stepNr++;
		}
		break;

	case SCI_TRANSITIONS_SCROLL_RIGHT:
		newScreenRect.left = newScreenRect.right;
		while (oldMoveRect.left < oldMoveRect.right) {
			oldMoveRect.left++; oldScreenRect.right--;
			newScreenRect.left--;
			if ((stepNr & 1) == 0) {
				msecCount += 5;
				if (doCreateFrame(msecCount)) {
					if (oldMoveRect.right > oldMoveRect.left)
						scrollCopyOldToScreen(oldScreenRect, oldMoveRect.left, oldMoveRect.top);
					_screen->copyRectToScreen(newScreenRect, newMoveRect.left, newMoveRect.top);
					updateScreenAndWait(msecCount);
				}
			}
			stepNr++;
		}
		break;

	case SCI_TRANSITIONS_SCROLL_UP:
		newScreenRect.bottom = newScreenRect.top;
		newMoveRect.top = newMoveRect.bottom;
		while (oldMoveRect.top < oldMoveRect.bottom) {
			oldMoveRect.top++; oldScreenRect.top++;
			newScreenRect.bottom++;	newMoveRect.top--;

			msecCount += 5;
			if (doCreateFrame(msecCount)) {
				if (oldMoveRect.top < oldMoveRect.bottom)
					scrollCopyOldToScreen(oldScreenRect, _picRect.left, _picRect.top);
				_screen->copyRectToScreen(newScreenRect, newMoveRect.left, newMoveRect.top);
				updateScreenAndWait(msecCount);
			}
		}
		break;

	case SCI_TRANSITIONS_SCROLL_DOWN:
		newScreenRect.top = newScreenRect.bottom;
		while (oldMoveRect.top < oldMoveRect.bottom) {
			oldMoveRect.top++; oldScreenRect.bottom--;
			newScreenRect.top--;

			msecCount += 5;
			if (doCreateFrame(msecCount)) {
				if (oldMoveRect.top < oldMoveRect.bottom)
					scrollCopyOldToScreen(oldScreenRect, oldMoveRect.left, oldMoveRect.top);
				_screen->copyRectToScreen(newScreenRect, _picRect.left, _picRect.top);
				updateScreenAndWait(msecCount);
			}
		}
		break;
	}

	// Copy over final position just in case
	_screen->copyRectToScreen(newScreenRect);
}

// Vertically displays new screen starting from center - works on _picRect area
// only
void GfxTransitions::verticalRollFromCenter(bool blackoutFlag) {
	Common::Rect leftRect = Common::Rect(_picRect.left + (_picRect.width() / 2) -1, _picRect.top, _picRect.left + (_picRect.width() / 2), _picRect.bottom);
	Common::Rect rightRect = Common::Rect(leftRect.right, _picRect.top, leftRect.right + 1, _picRect.bottom);
	uint32 msecCount = 0;

	while ((leftRect.left >= _picRect.left) || (rightRect.right <= _picRect.right)) {
		if (leftRect.left < _picRect.left)
			leftRect.translate(1, 0);
		if (rightRect.right > _picRect.right)
			rightRect.translate(-1, 0);
		copyRectToScreen(leftRect, blackoutFlag); leftRect.translate(-1, 0);
		copyRectToScreen(rightRect, blackoutFlag); rightRect.translate(1, 0);
		msecCount += 3;
		if (doCreateFrame(msecCount)) {
			updateScreenAndWait(msecCount);
		}
	}
}

// Vertically displays new screen starting from edges - works on _picRect area
// only
void GfxTransitions::verticalRollToCenter(bool blackoutFlag) {
	Common::Rect leftRect = Common::Rect(_picRect.left, _picRect.top, _picRect.left + 1, _picRect.bottom);
	Common::Rect rightRect = Common::Rect(_picRect.right - 1, _picRect.top, _picRect.right, _picRect.bottom);
	uint32 msecCount = 0;

	while (leftRect.left < rightRect.right) {
		copyRectToScreen(leftRect, blackoutFlag); leftRect.translate(1, 0);
		copyRectToScreen(rightRect, blackoutFlag); rightRect.translate(-1, 0);
		msecCount += 3;
		if (doCreateFrame(msecCount)) {
			updateScreenAndWait(msecCount);
		}
	}
}

// Horizontally displays new screen starting from center - works on _picRect
// area only
void GfxTransitions::horizontalRollFromCenter(bool blackoutFlag) {
	Common::Rect upperRect = Common::Rect(_picRect.left, _picRect.top + (_picRect.height() / 2) - 1, _picRect.right, _picRect.top + (_picRect.height() / 2));
	Common::Rect lowerRect = Common::Rect(upperRect.left, upperRect.bottom, upperRect.right, upperRect.bottom + 1);
	uint32 msecCount = 0;

	while ((upperRect.top >= _picRect.top) || (lowerRect.bottom <= _picRect.bottom)) {
		if (upperRect.top < _picRect.top)
			upperRect.translate(0, 1);
		if (lowerRect.bottom > _picRect.bottom)
			lowerRect.translate(0, -1);
		copyRectToScreen(upperRect, blackoutFlag); upperRect.translate(0, -1);
		copyRectToScreen(lowerRect, blackoutFlag); lowerRect.translate(0, 1);
		msecCount += 4;
		if (doCreateFrame(msecCount)) {
			updateScreenAndWait(msecCount);
		}
	}
}

// Horizontally displays new screen starting from upper and lower edge - works
// on _picRect area only
void GfxTransitions::horizontalRollToCenter(bool blackoutFlag) {
	Common::Rect upperRect = Common::Rect(_picRect.left, _picRect.top, _picRect.right, _picRect.top + 1);
	Common::Rect lowerRect = Common::Rect(upperRect.left, _picRect.bottom - 1, upperRect.right, _picRect.bottom);
	uint32 msecCount = 0;

	while (upperRect.top < lowerRect.bottom) {
		copyRectToScreen(upperRect, blackoutFlag); upperRect.translate(0, 1);
		copyRectToScreen(lowerRect, blackoutFlag); lowerRect.translate(0, -1);
		msecCount += 4;
		if (doCreateFrame(msecCount)) {
			updateScreenAndWait(msecCount);
		}
	}
}

// Diagonally displays new screen starting from center - works on _picRect area
// only. Assumes that height of rect is larger than width.
void GfxTransitions::diagonalRollFromCenter(bool blackoutFlag) {
	int16 halfHeight = _picRect.height() / 2;
	Common::Rect upperRect(_picRect.left + halfHeight - 2, _picRect.top + halfHeight, _picRect.right - halfHeight + 1, _picRect.top + halfHeight + 1);
	Common::Rect lowerRect(upperRect.left, upperRect.top, upperRect.right, upperRect.bottom);
	Common::Rect leftRect(upperRect.left, upperRect.top, upperRect.left + 1, lowerRect.bottom);
	Common::Rect rightRect(upperRect.right, upperRect.top, upperRect.right + 1, lowerRect.bottom);
	uint32 msecCount = 0;

	while ((upperRect.top >= _picRect.top) || (lowerRect.bottom <= _picRect.bottom)) {
		if (upperRect.top < _picRect.top) {
			upperRect.translate(0, 1); leftRect.top++; rightRect.top++;
		}
		if (lowerRect.bottom > _picRect.bottom) {
			lowerRect.translate(0, -1); leftRect.bottom--; rightRect.bottom--;
		}
		if (leftRect.left < _picRect.left) {
			leftRect.translate(1, 0); upperRect.left++; lowerRect.left++;
		}
		if (rightRect.right > _picRect.right) {
			rightRect.translate(-1, 0); upperRect.right--; lowerRect.right--;
		}
		copyRectToScreen(upperRect, blackoutFlag); upperRect.translate(0, -1); upperRect.left--; upperRect.right++;
		copyRectToScreen(lowerRect, blackoutFlag); lowerRect.translate(0, 1); lowerRect.left--; lowerRect.right++;
		copyRectToScreen(leftRect, blackoutFlag); leftRect.translate(-1, 0);	leftRect.top--; leftRect.bottom++;
		copyRectToScreen(rightRect, blackoutFlag); rightRect.translate(1, 0); rightRect.top--; rightRect.bottom++;
		msecCount += 4;
		if (doCreateFrame(msecCount)) {
			updateScreenAndWait(msecCount);
		}
	}
}

// Diagonally displays new screen starting from edges - works on _picRect area
// only. Assumes that height of rect is larger than width.
void GfxTransitions::diagonalRollToCenter(bool blackoutFlag) {
	Common::Rect upperRect(_picRect.left, _picRect.top, _picRect.right, _picRect.top + 1);
	Common::Rect lowerRect(_picRect.left, _picRect.bottom - 1, _picRect.right, _picRect.bottom);
	Common::Rect leftRect(_picRect.left, _picRect.top, _picRect.left + 1, _picRect.bottom);
	Common::Rect rightRect(_picRect.right - 1, _picRect.top, _picRect.right, _picRect.bottom);
	uint32 msecCount = 0;

	while (upperRect.top < lowerRect.bottom) {
		copyRectToScreen(upperRect, blackoutFlag); upperRect.translate(0, 1); upperRect.left++; upperRect.right--;
		copyRectToScreen(lowerRect, blackoutFlag); lowerRect.translate(0, -1); lowerRect.left++; lowerRect.right--;
		copyRectToScreen(leftRect, blackoutFlag); leftRect.translate(1, 0);
		copyRectToScreen(rightRect, blackoutFlag); rightRect.translate(-1, 0);
		msecCount += 4;
		if (doCreateFrame(msecCount)) {
			updateScreenAndWait(msecCount);
		}
	}
}

} // End of namespace Sci