summaryrefslogtreecommitdiff
path: root/src/gfx.cpp
blob: 9f7f4150bdf576c3d47ec0f6ba92dc556cf569c7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
/* $Id$ */

/** @file gfx.cpp Handling of drawing text and other gfx related stuff. */

#include "stdafx.h"
#include "openttd.h"
#include "gfx_func.h"
#include "spritecache.h"
#include "variables.h"
#include "fontcache.h"
#include "genworld.h"
#include "debug.h"
#include "zoom_func.h"
#include "texteff.hpp"
#include "blitter/factory.hpp"
#include "video/video_driver.hpp"
#include "strings_func.h"
#include "core/math_func.hpp"
#include "settings_type.h"
#include "core/alloc_func.hpp"
#include "core/sort_func.hpp"
#include "landscape_type.h"

#include "table/palettes.h"
#include "table/sprites.h"
#include "table/control_codes.h"

byte _dirkeys;        ///< 1 = left, 2 = up, 4 = right, 8 = down
bool _fullscreen;
CursorVars _cursor;
bool _ctrl_pressed;   ///< Is Ctrl pressed?
bool _shift_pressed;  ///< Is Shift pressed?
byte _fast_forward;
bool _left_button_down;     ///< Is left mouse button pressed?
bool _left_button_clicked;  ///< Is left mouse button clicked?
bool _right_button_down;    ///< Is right mouse button pressed?
bool _right_button_clicked; ///< Is right mouse button clicked?
DrawPixelInfo _screen;
bool _screen_disable_anim = false;   ///< Disable palette animation (important for 32bpp-anim blitter during giant screenshot)
bool _exit_game;
bool _networking;         ///< are we in networking mode?
byte _game_mode;
int8 _pause_game;
int _pal_first_dirty;
int _pal_count_dirty;

Colour _cur_palette[256];
byte _stringwidth_table[FS_END][224];
DrawPixelInfo *_cur_dpi;
byte _colour_gradient[16][8];
bool _use_dos_palette;

static void GfxMainBlitter(const Sprite *sprite, int x, int y, BlitterMode mode, const SubSprite *sub = NULL);

FontSize _cur_fontsize;
static FontSize _last_fontsize;
static uint8 _cursor_backup[64 * 64 * 4];

/**
 * The rect for repaint.
 *
 * This rectangle defines the area which should be repaint by the video driver.
 *
 * @ingroup dirty
 */
static Rect _invalid_rect;
static const byte *_color_remap_ptr;
static byte _string_colorremap[3];

enum {
	DIRTY_BLOCK_HEIGHT   = 8,
	DIRTY_BLOCK_WIDTH    = 64,
};
static uint _dirty_bytes_per_line = 0;
static byte *_dirty_blocks = NULL;

void GfxScroll(int left, int top, int width, int height, int xo, int yo)
{
	Blitter *blitter = BlitterFactoryBase::GetCurrentBlitter();

	if (xo == 0 && yo == 0) return;

	if (_cursor.visible) UndrawMouseCursor();
	UndrawChatMessage();

	blitter->ScrollBuffer(_screen.dst_ptr, left, top, width, height, xo, yo);
	/* This part of the screen is now dirty. */
	_video_driver->MakeDirty(left, top, width, height);
}


void GfxFillRect(int left, int top, int right, int bottom, int color)
{
	Blitter *blitter = BlitterFactoryBase::GetCurrentBlitter();
	const DrawPixelInfo *dpi = _cur_dpi;
	void *dst;
	const int otop = top;
	const int oleft = left;

	if (dpi->zoom != ZOOM_LVL_NORMAL) return;
	if (left > right || top > bottom) return;
	if (right < dpi->left || left >= dpi->left + dpi->width) return;
	if (bottom < dpi->top || top >= dpi->top + dpi->height) return;

	if ( (left -= dpi->left) < 0) left = 0;
	right = right - dpi->left + 1;
	if (right > dpi->width) right = dpi->width;
	right -= left;
	assert(right > 0);

	if ( (top -= dpi->top) < 0) top = 0;
	bottom = bottom - dpi->top + 1;
	if (bottom > dpi->height) bottom = dpi->height;
	bottom -= top;
	assert(bottom > 0);

	dst = blitter->MoveTo(dpi->dst_ptr, left, top);

	if (!HasBit(color, PALETTE_MODIFIER_GREYOUT)) {
		if (!HasBit(color, USE_COLORTABLE)) {
			blitter->DrawRect(dst, right, bottom, (uint8)color);
		} else {
			blitter->DrawColorMappingRect(dst, right, bottom, GB(color, 0, PALETTE_WIDTH));
		}
	} else {
		byte bo = (oleft - left + dpi->left + otop - top + dpi->top) & 1;
		do {
			for (int i = (bo ^= 1); i < right; i += 2) blitter->SetPixel(dst, i, 0, (uint8)color);
			dst = blitter->MoveTo(dst, 0, 1);
		} while (--bottom > 0);
	}
}

void GfxDrawLine(int x, int y, int x2, int y2, int color)
{
	Blitter *blitter = BlitterFactoryBase::GetCurrentBlitter();
	DrawPixelInfo *dpi = _cur_dpi;

	x -= dpi->left;
	x2 -= dpi->left;
	y -= dpi->top;
	y2 -= dpi->top;

	/* Check clipping */
	if (x < 0 && x2 < 0) return;
	if (y < 0 && y2 < 0) return;
	if (x > dpi->width  && x2 > dpi->width)  return;
	if (y > dpi->height && y2 > dpi->height) return;

	blitter->DrawLine(dpi->dst_ptr, x, y, x2, y2, dpi->width, dpi->height, color);
}

void GfxDrawLineUnscaled(int x, int y, int x2, int y2, int color)
{
	Blitter *blitter = BlitterFactoryBase::GetCurrentBlitter();
	DrawPixelInfo *dpi = _cur_dpi;

	x -= dpi->left;
	x2 -= dpi->left;
	y -= dpi->top;
	y2 -= dpi->top;

	/* Check clipping */
	if (x < 0 && x2 < 0) return;
	if (y < 0 && y2 < 0) return;
	if (x > dpi->width  && x2 > dpi->width)  return;
	if (y > dpi->height && y2 > dpi->height) return;

	blitter->DrawLine(dpi->dst_ptr, UnScaleByZoom(x, dpi->zoom), UnScaleByZoom(y, dpi->zoom),
			UnScaleByZoom(x2, dpi->zoom), UnScaleByZoom(y2, dpi->zoom),
			UnScaleByZoom(dpi->width, dpi->zoom), UnScaleByZoom(dpi->height, dpi->zoom), color);
}

/**
 * Draws the projection of a parallelepiped.
 * This can be used to draw boxes in world coordinates.
 *
 * @param x   Screen X-coordinate of top front corner.
 * @param y   Screen Y-coordinate of top front corner.
 * @param dx1 Screen X-length of first edge.
 * @param dy1 Screen Y-length of first edge.
 * @param dx2 Screen X-length of second edge.
 * @param dy2 Screen Y-length of second edge.
 * @param dx3 Screen X-length of third edge.
 * @param dy3 Screen Y-length of third edge.
 */
void DrawBox(int x, int y, int dx1, int dy1, int dx2, int dy2, int dx3, int dy3)
{
	/*           ....
	 *         ..    ....
	 *       ..          ....
	 *     ..                ^
	 *   <--__(dx1,dy1)    /(dx2,dy2)
	 *   :    --__       /   :
	 *   :        --__ /     :
	 *   :            *(x,y) :
	 *   :            |      :
	 *   :            |     ..
	 *    ....        |(dx3,dy3)
	 *        ....    | ..
	 *            ....V.
	 */

	static const byte color = 255;

	GfxDrawLineUnscaled(x, y, x + dx1, y + dy1, color);
	GfxDrawLineUnscaled(x, y, x + dx2, y + dy2, color);
	GfxDrawLineUnscaled(x, y, x + dx3, y + dy3, color);

	GfxDrawLineUnscaled(x + dx1, y + dy1, x + dx1 + dx2, y + dy1 + dy2, color);
	GfxDrawLineUnscaled(x + dx1, y + dy1, x + dx1 + dx3, y + dy1 + dy3, color);
	GfxDrawLineUnscaled(x + dx2, y + dy2, x + dx2 + dx1, y + dy2 + dy1, color);
	GfxDrawLineUnscaled(x + dx2, y + dy2, x + dx2 + dx3, y + dy2 + dy3, color);
	GfxDrawLineUnscaled(x + dx3, y + dy3, x + dx3 + dx1, y + dy3 + dy1, color);
	GfxDrawLineUnscaled(x + dx3, y + dy3, x + dx3 + dx2, y + dy3 + dy2, color);
}


/** Truncate a given string to a maximum width if neccessary.
 * If the string is truncated, add three dots ('...') to show this.
 * @param *str string that is checked and possibly truncated
 * @param maxw maximum width in pixels of the string
 * @return new width of (truncated) string */
static int TruncateString(char *str, int maxw)
{
	int w = 0;
	FontSize size = _cur_fontsize;
	int ddd, ddd_w;

	WChar c;
	char *ddd_pos;

	ddd_w = ddd = GetCharacterWidth(size, '.') * 3;

	for (ddd_pos = str; (c = Utf8Consume((const char **)&str)) != '\0'; ) {
		if (IsPrintable(c)) {
			w += GetCharacterWidth(size, c);

			if (w >= maxw) {
				/* string got too big... insert dotdotdot */
				ddd_pos[0] = ddd_pos[1] = ddd_pos[2] = '.';
				ddd_pos[3] = '\0';
				return ddd_w;
			}
		} else {
			if (c == SCC_SETX) str++;
			else if (c == SCC_SETXY) str += 2;
			else if (c == SCC_TINYFONT) {
				size = FS_SMALL;
				ddd = GetCharacterWidth(size, '.') * 3;
			} else if (c == SCC_BIGFONT) {
				size = FS_LARGE;
				ddd = GetCharacterWidth(size, '.') * 3;
			}
		}

		/* Remember the last position where three dots fit. */
		if (w + ddd < maxw) {
			ddd_w = w + ddd;
			ddd_pos = str;
		}
	}

	return w;
}

static inline int TruncateStringID(StringID src, char *dest, int maxw, const char* last)
{
	GetString(dest, src, last);
	return TruncateString(dest, maxw);
}

/* returns right coordinate */
int DrawString(int x, int y, StringID str, uint16 color)
{
	char buffer[512];

	GetString(buffer, str, lastof(buffer));
	return DoDrawString(buffer, x, y, color);
}

int DrawStringTruncated(int x, int y, StringID str, uint16 color, uint maxw)
{
	char buffer[512];
	TruncateStringID(str, buffer, maxw, lastof(buffer));
	return DoDrawString(buffer, x, y, color);
}


int DrawStringRightAligned(int x, int y, StringID str, uint16 color)
{
	char buffer[512];
	int w;

	GetString(buffer, str, lastof(buffer));
	w = GetStringBoundingBox(buffer).width;
	DoDrawString(buffer, x - w, y, color);

	return w;
}

void DrawStringRightAlignedTruncated(int x, int y, StringID str, uint16 color, uint maxw)
{
	char buffer[512];

	TruncateStringID(str, buffer, maxw, lastof(buffer));
	DoDrawString(buffer, x - GetStringBoundingBox(buffer).width, y, color);
}

void DrawStringRightAlignedUnderline(int x, int y, StringID str, uint16 color)
{
	int w = DrawStringRightAligned(x, y, str, color);
	GfxFillRect(x - w, y + 10, x, y + 10, _string_colorremap[1]);
}


int DrawStringCentered(int x, int y, StringID str, uint16 color)
{
	char buffer[512];
	int w;

	GetString(buffer, str, lastof(buffer));

	w = GetStringBoundingBox(buffer).width;
	DoDrawString(buffer, x - w / 2, y, color);

	return w;
}

int DrawStringCenteredTruncated(int xl, int xr, int y, StringID str, uint16 color)
{
	char buffer[512];
	int w = TruncateStringID(str, buffer, xr - xl, lastof(buffer));
	return DoDrawString(buffer, (xl + xr - w) / 2, y, color);
}

int DoDrawStringCentered(int x, int y, const char *str, uint16 color)
{
	int w = GetStringBoundingBox(str).width;
	DoDrawString(str, x - w / 2, y, color);
	return w;
}

void DrawStringCenterUnderline(int x, int y, StringID str, uint16 color)
{
	int w = DrawStringCentered(x, y, str, color);
	GfxFillRect(x - (w >> 1), y + 10, x - (w >> 1) + w, y + 10, _string_colorremap[1]);
}

void DrawStringCenterUnderlineTruncated(int xl, int xr, int y, StringID str, uint16 color)
{
	int w = DrawStringCenteredTruncated(xl, xr, y, str, color);
	GfxFillRect((xl + xr - w) / 2, y + 10, (xl + xr + w) / 2, y + 10, _string_colorremap[1]);
}

/**
 * 'Correct' a string to a maximum length. Longer strings will be cut into
 * additional lines at whitespace characters if possible. The string parameter
 * is modified with terminating characters mid-string which are the
 * placeholders for the newlines.
 * The string WILL be truncated if there was no whitespace for the current
 * line's maximum width.
 *
 * @note To know if the terminating '\0' is the string end or just a
 * newline, the returned 'num' value should be consulted. The num'th '\0',
 * starting with index 0 is the real string end.
 *
 * @param str string to check and correct for length restrictions
 * @param maxw the maximum width the string can have on one line
 * @return return a 32bit wide number consisting of 2 packed values:
 *  0 - 15 the number of lines ADDED to the string
 * 16 - 31 the fontsize in which the length calculation was done at
 */
uint32 FormatStringLinebreaks(char *str, int maxw)
{
	FontSize size = _cur_fontsize;
	int num = 0;

	assert(maxw > 0);

	for (;;) {
		char *last_space = NULL;
		int w = 0;

		for (;;) {
			WChar c = Utf8Consume((const char **)&str);
			/* whitespace is where we will insert the line-break */
			if (IsWhitespace(c)) last_space = str;

			if (IsPrintable(c)) {
				w += GetCharacterWidth(size, c);
				/* string is longer than maximum width so we need to decide what to
				 * do. We can do two things:
				 * 1. If no whitespace was found at all up until now (on this line) then
				 *    we will truncate the string and bail out.
				 * 2. In all other cases force a linebreak at the last seen whitespace */
				if (w > maxw) {
					if (last_space == NULL) {
						*Utf8PrevChar(str) = '\0';
						return num + (size << 16);
					}
					str = last_space;
					break;
				}
			} else {
				switch (c) {
					case '\0': return num + (size << 16); break;
					case SCC_SETX:  str++; break;
					case SCC_SETXY: str += 2; break;
					case SCC_TINYFONT: size = FS_SMALL; break;
					case SCC_BIGFONT:  size = FS_LARGE; break;
					case '\n': goto end_of_inner_loop;
				}
			}
		}
end_of_inner_loop:
		/* String didn't fit on line (or a '\n' was encountered), so 'dummy' terminate
		 * and increase linecount. We use Utf8PrevChar() as also non 1 char long
		 * whitespace seperators are supported */
		num++;
		char *s = Utf8PrevChar(str);
		*s++ = '\0';

		/* In which case (see above) we will shift remainder to left and close the gap */
		if (str - s >= 1) {
			for (; str[-1] != '\0';) *s++ = *str++;
		}
	}
}

/** Draw a given string with the centre around the given (x,y) coordinates
 * @param x Centre the string around this pixel width
 * @param y Centre the string around this pixel height
 * @param str String to draw
 * @param maxw Maximum width the string can have before it is wrapped */
void DrawStringMultiCenter(int x, int y, StringID str, int maxw)
{
	char buffer[512];
	uint32 tmp;
	int num, w, mt;
	const char *src;
	WChar c;

	GetString(buffer, str, lastof(buffer));

	tmp = FormatStringLinebreaks(buffer, maxw);
	num = GB(tmp, 0, 16);

	mt = GetCharacterHeight((FontSize)GB(tmp, 16, 16));

	y -= (mt >> 1) * num;

	src = buffer;

	for (;;) {
		w = GetStringBoundingBox(src).width;
		DoDrawString(src, x - (w >> 1), y, 0xFE);
		_cur_fontsize = _last_fontsize;

		for (;;) {
			c = Utf8Consume(&src);
			if (c == 0) {
				y += mt;
				if (--num < 0) {
					_cur_fontsize = FS_NORMAL;
					return;
				}
				break;
			} else if (c == SCC_SETX) {
				src++;
			} else if (c == SCC_SETXY) {
				src += 2;
			}
		}
	}
}


uint DrawStringMultiLine(int x, int y, StringID str, int maxw, int maxh)
{
	char buffer[512];
	uint32 tmp;
	int num, mt;
	uint total_height;
	const char *src;
	WChar c;

	GetString(buffer, str, lastof(buffer));

	tmp = FormatStringLinebreaks(buffer, maxw);
	num = GB(tmp, 0, 16);

	mt = GetCharacterHeight((FontSize)GB(tmp, 16, 16));
	total_height = (num + 1) * mt;

	if (maxh != -1 && (int)total_height > maxh) {
		/* Check there's room enough for at least one line. */
		if (maxh < mt) return 0;

		num = maxh / mt - 1;
		total_height = (num + 1) * mt;
	}

	src = buffer;

	for (;;) {
		DoDrawString(src, x, y, 0xFE);
		_cur_fontsize = _last_fontsize;

		for (;;) {
			c = Utf8Consume(&src);
			if (c == 0) {
				y += mt;
				if (--num < 0) {
					_cur_fontsize = FS_NORMAL;
					return total_height;
				}
				break;
			} else if (c == SCC_SETX) {
				src++;
			} else if (c == SCC_SETXY) {
				src += 2;
			}
		}
	}
}

/** Return the string dimension in pixels. The height and width are returned
 * in a single Dimension value. TINYFONT, BIGFONT modifiers are only
 * supported as the first character of the string. The returned dimensions
 * are therefore a rough estimation correct for all the current strings
 * but not every possible combination
 * @param str string to calculate pixel-width
 * @return string width and height in pixels */
Dimension GetStringBoundingBox(const char *str)
{
	FontSize size = _cur_fontsize;
	Dimension br;
	int max_width;
	WChar c;

	br.width = br.height = max_width = 0;
	for (;;) {
		c = Utf8Consume(&str);
		if (c == 0) break;
		if (IsPrintable(c)) {
			br.width += GetCharacterWidth(size, c);
		} else {
			switch (c) {
				case SCC_SETX: br.width += (byte)*str++; break;
				case SCC_SETXY:
					br.width += (byte)*str++;
					br.height += (byte)*str++;
					break;
				case SCC_TINYFONT: size = FS_SMALL; break;
				case SCC_BIGFONT:  size = FS_LARGE; break;
				case '\n':
					br.height += GetCharacterHeight(size);
					if (br.width > max_width) max_width = br.width;
					br.width = 0;
					break;
			}
		}
	}
	br.height += GetCharacterHeight(size);

	br.width  = max(br.width, max_width);
	return br;
}

void DrawCharCentered(WChar c, int x, int y, uint16 real_color)
{
	FontSize size = FS_NORMAL;
	byte color = real_color & 0xFF;
	uint palette = _use_dos_palette ? 1 : 0;
	int w = GetCharacterWidth(size, c);

	_string_colorremap[1] = _string_colormap[palette][color].text;
	_string_colorremap[2] = _string_colormap[palette][color].shadow;
	_color_remap_ptr = _string_colorremap;

	GfxMainBlitter(GetGlyph(size, c), x - w / 2, y, BM_COLOUR_REMAP);
}

/** Draw a string at the given coordinates with the given colour
 * @param string the string to draw
 * @param x offset from left side of the screen, if negative offset from the right side
 * @param y offset from top side of the screen, if negative offset from the bottom
 * @param real_color colour of the string, see _string_colormap in
 * table/palettes.h or docs/ottd-colourtext-palette.png or the enum TextColour in gfx_type.h
 * @return the x-coordinates where the drawing has finished. If nothing is drawn
 * the originally passed x-coordinate is returned */
int DoDrawString(const char *string, int x, int y, uint16 real_color)
{
	DrawPixelInfo *dpi = _cur_dpi;
	FontSize size = _cur_fontsize;
	WChar c;
	int xo = x, yo = y;

	byte color = real_color & 0xFF;
	byte previous_color = color;

	if (color != 0xFE) {
		if (x >= dpi->left + dpi->width ||
				x + _screen.width * 2 <= dpi->left ||
				y >= dpi->top + dpi->height ||
				y + _screen.height <= dpi->top)
					return x;

		if (color != 0xFF) {
switch_color:;
			if (real_color & IS_PALETTE_COLOR) {
				_string_colorremap[1] = color;
				_string_colorremap[2] = _use_dos_palette ? 1 : 215;
			} else {
				uint palette = _use_dos_palette ? 1 : 0;
				_string_colorremap[1] = _string_colormap[palette][color].text;
				_string_colorremap[2] = _string_colormap[palette][color].shadow;
			}
			_color_remap_ptr = _string_colorremap;
		}
	}

check_bounds:
	if (y + 19 <= dpi->top || dpi->top + dpi->height <= y) {
skip_char:;
		for (;;) {
			c = Utf8Consume(&string);
			if (!IsPrintable(c)) goto skip_cont;
		}
	}

	for (;;) {
		c = Utf8Consume(&string);
skip_cont:;
		if (c == 0) {
			_last_fontsize = size;
			return x;
		}
		if (IsPrintable(c)) {
			if (x >= dpi->left + dpi->width) goto skip_char;
			if (x + 26 >= dpi->left) {
				GfxMainBlitter(GetGlyph(size, c), x, y, BM_COLOUR_REMAP);
			}
			x += GetCharacterWidth(size, c);
		} else if (c == '\n') { // newline = {}
			x = xo;
			y += GetCharacterHeight(size);
			goto check_bounds;
		} else if (c >= SCC_BLUE && c <= SCC_BLACK) { // change color?
			previous_color = color;
			color = (byte)(c - SCC_BLUE);
			goto switch_color;
		} else if (c == SCC_PREVIOUS_COLOUR) { // revert to the previous color
			Swap(color, previous_color);
			goto switch_color;
		} else if (c == SCC_SETX) { // {SETX}
			x = xo + (byte)*string++;
		} else if (c == SCC_SETXY) {// {SETXY}
			x = xo + (byte)*string++;
			y = yo + (byte)*string++;
		} else if (c == SCC_TINYFONT) { // {TINYFONT}
			size = FS_SMALL;
		} else if (c == SCC_BIGFONT) { // {BIGFONT}
			size = FS_LARGE;
		} else {
			DEBUG(misc, 0, "[utf8] unknown string command character %d", c);
		}
	}
}

int DoDrawStringTruncated(const char *str, int x, int y, uint16 color, uint maxw)
{
	char buffer[512];
	ttd_strlcpy(buffer, str, sizeof(buffer));
	TruncateString(buffer, maxw);
	return DoDrawString(buffer, x, y, color);
}

void DrawSprite(SpriteID img, SpriteID pal, int x, int y, const SubSprite *sub)
{
	if (HasBit(img, PALETTE_MODIFIER_TRANSPARENT)) {
		_color_remap_ptr = GetNonSprite(GB(pal, 0, PALETTE_WIDTH)) + 1;
		GfxMainBlitter(GetSprite(GB(img, 0, SPRITE_WIDTH)), x, y, BM_TRANSPARENT, sub);
	} else if (pal != PAL_NONE) {
		_color_remap_ptr = GetNonSprite(GB(pal, 0, PALETTE_WIDTH)) + 1;
		GfxMainBlitter(GetSprite(GB(img, 0, SPRITE_WIDTH)), x, y, BM_COLOUR_REMAP, sub);
	} else {
		GfxMainBlitter(GetSprite(GB(img, 0, SPRITE_WIDTH)), x, y, BM_NORMAL, sub);
	}
}

static void GfxMainBlitter(const Sprite *sprite, int x, int y, BlitterMode mode, const SubSprite *sub)
{
	const DrawPixelInfo *dpi = _cur_dpi;
	Blitter::BlitterParams bp;

	/* Amount of pixels to clip from the source sprite */
	int clip_left   = (sub != NULL ? max(0,                   -sprite->x_offs + sub->left       ) : 0);
	int clip_top    = (sub != NULL ? max(0,                   -sprite->y_offs + sub->top        ) : 0);
	int clip_right  = (sub != NULL ? max(0, sprite->width  - (-sprite->x_offs + sub->right  + 1)) : 0);
	int clip_bottom = (sub != NULL ? max(0, sprite->height - (-sprite->y_offs + sub->bottom + 1)) : 0);

	if (clip_left + clip_right >= sprite->width) return;
	if (clip_top + clip_bottom >= sprite->height) return;

	/* Move to the correct offset */
	x += sprite->x_offs;
	y += sprite->y_offs;

	/* Copy the main data directly from the sprite */
	bp.sprite = sprite->data;
	bp.sprite_width = sprite->width;
	bp.sprite_height = sprite->height;
	bp.width = UnScaleByZoom(sprite->width - clip_left - clip_right, dpi->zoom);
	bp.height = UnScaleByZoom(sprite->height - clip_top - clip_bottom, dpi->zoom);
	bp.top = 0;
	bp.left = 0;
	bp.skip_left = UnScaleByZoomLower(clip_left, dpi->zoom);
	bp.skip_top = UnScaleByZoomLower(clip_top, dpi->zoom);

	x += ScaleByZoom(bp.skip_left, dpi->zoom);
	y += ScaleByZoom(bp.skip_top, dpi->zoom);

	bp.dst = dpi->dst_ptr;
	bp.pitch = dpi->pitch;
	bp.remap = _color_remap_ptr;

	assert(sprite->width > 0);
	assert(sprite->height > 0);

	if (bp.width <= 0) return;
	if (bp.height <= 0) return;

	y -= dpi->top;
	/* Check for top overflow */
	if (y < 0) {
		bp.height -= -UnScaleByZoom(y, dpi->zoom);
		if (bp.height <= 0) return;
		bp.skip_top += -UnScaleByZoom(y, dpi->zoom);
		y = 0;
	} else {
		bp.top = UnScaleByZoom(y, dpi->zoom);
	}

	/* Check for bottom overflow */
	y += ScaleByZoom(bp.height, dpi->zoom) - dpi->height;
	if (y > 0) {
		bp.height -= UnScaleByZoom(y, dpi->zoom);
		if (bp.height <= 0) return;
	}

	x -= dpi->left;
	/* Check for left overflow */
	if (x < 0) {
		bp.width -= -UnScaleByZoom(x, dpi->zoom);
		if (bp.width <= 0) return;
		bp.skip_left += -UnScaleByZoom(x, dpi->zoom);
		x = 0;
	} else {
		bp.left = UnScaleByZoom(x, dpi->zoom);
	}

	/* Check for right overflow */
	x += ScaleByZoom(bp.width, dpi->zoom) - dpi->width;
	if (x > 0) {
		bp.width -= UnScaleByZoom(x, dpi->zoom);
		if (bp.width <= 0) return;
	}

	assert(bp.skip_left + bp.width <= UnScaleByZoom(sprite->width, dpi->zoom));
	assert(bp.skip_top + bp.height <= UnScaleByZoom(sprite->height, dpi->zoom));

	BlitterFactoryBase::GetCurrentBlitter()->Draw(&bp, mode, dpi->zoom);
}

void DoPaletteAnimations();

void GfxInitPalettes()
{
	memcpy(_cur_palette, _palettes[_use_dos_palette ? 1 : 0], sizeof(_cur_palette));

	DoPaletteAnimations();
	_pal_first_dirty = 0;
	_pal_count_dirty = 256;
}

#define EXTR(p, q) (((uint16)(_palette_animation_counter * (p)) * (q)) >> 16)
#define EXTR2(p, q) (((uint16)(~_palette_animation_counter * (p)) * (q)) >> 16)

void DoPaletteAnimations()
{
	Blitter *blitter = BlitterFactoryBase::GetCurrentBlitter();
	const Colour *s;
	Colour *d;
	/* Amount of colors to be rotated.
	 * A few more for the DOS palette, because the water colors are
	 * 245-254 for DOS and 217-226 for Windows.  */
	const ExtraPaletteValues *ev = &_extra_palette_values;
	int c = _use_dos_palette ? 38 : 28;
	Colour old_val[38];
	uint i;
	uint j;
	uint old_tc = _palette_animation_counter;

	if (blitter != NULL && blitter->UsePaletteAnimation() == Blitter::PALETTE_ANIMATION_NONE) {
		_palette_animation_counter = 0;
	}

	d = &_cur_palette[217];
	memcpy(old_val, d, c * sizeof(*old_val));

	/* Dark blue water */
	s = (_settings_game.game_creation.landscape == LT_TOYLAND) ? ev->ac : ev->a;
	j = EXTR(320, 5);
	for (i = 0; i != 5; i++) {
		*d++ = s[j];
		j++;
		if (j == 5) j = 0;
	}

	/* Glittery water */
	s = (_settings_game.game_creation.landscape == LT_TOYLAND) ? ev->bc : ev->b;
	j = EXTR(128, 15);
	for (i = 0; i != 5; i++) {
		*d++ = s[j];
		j += 3;
		if (j >= 15) j -= 15;
	}

	s = ev->e;
	j = EXTR2(512, 5);
	for (i = 0; i != 5; i++) {
		*d++ = s[j];
		j++;
		if (j == 5) j = 0;
	}

	/* Oil refinery fire animation */
	s = ev->oil_ref;
	j = EXTR2(512, 7);
	for (i = 0; i != 7; i++) {
		*d++ = s[j];
		j++;
		if (j == 7) j = 0;
	}

	/* Radio tower blinking */
	{
		byte i = (_palette_animation_counter >> 1) & 0x7F;
		byte v;

		(v = 255, i < 0x3f) ||
		(v = 128, i < 0x4A || i >= 0x75) ||
		(v = 20);
		d->r = v;
		d->g = 0;
		d->b = 0;
		d++;

		i ^= 0x40;
		(v = 255, i < 0x3f) ||
		(v = 128, i < 0x4A || i >= 0x75) ||
		(v = 20);
		d->r = v;
		d->g = 0;
		d->b = 0;
		d++;
	}

	/* Handle lighthouse and stadium animation */
	s = ev->lighthouse;
	j = EXTR(256, 4);
	for (i = 0; i != 4; i++) {
		*d++ = s[j];
		j++;
		if (j == 4) j = 0;
	}

	/* Animate water for old DOS graphics */
	if (_use_dos_palette) {
		/* Dark blue water DOS */
		s = (_settings_game.game_creation.landscape == LT_TOYLAND) ? ev->ac : ev->a;
		j = EXTR(320, 5);
		for (i = 0; i != 5; i++) {
			*d++ = s[j];
			j++;
			if (j == 5) j = 0;
		}

		/* Glittery water DOS */
		s = (_settings_game.game_creation.landscape == LT_TOYLAND) ? ev->bc : ev->b;
		j = EXTR(128, 15);
		for (i = 0; i != 5; i++) {
			*d++ = s[j];
			j += 3;
			if (j >= 15) j -= 15;
		}
	}

	if (blitter != NULL && blitter->UsePaletteAnimation() == Blitter::PALETTE_ANIMATION_NONE) {
		_palette_animation_counter = old_tc;
	} else {
		if (memcmp(old_val, &_cur_palette[217], c * sizeof(*old_val)) != 0) {
			_pal_first_dirty = 217;
			_pal_count_dirty = c;
		}
	}
}


void LoadStringWidthTable()
{
	uint i;

	/* Normal font */
	for (i = 0; i != 224; i++) {
		_stringwidth_table[FS_NORMAL][i] = GetGlyphWidth(FS_NORMAL, i + 32);
	}

	/* Small font */
	for (i = 0; i != 224; i++) {
		_stringwidth_table[FS_SMALL][i] = GetGlyphWidth(FS_SMALL, i + 32);
	}

	/* Large font */
	for (i = 0; i != 224; i++) {
		_stringwidth_table[FS_LARGE][i] = GetGlyphWidth(FS_LARGE, i + 32);
	}
}


byte GetCharacterWidth(FontSize size, WChar key)
{
	if (key >= 32 && key < 256) return _stringwidth_table[size][key - 32];

	return GetGlyphWidth(size, key);
}


void ScreenSizeChanged()
{
	_dirty_bytes_per_line = (_screen.width + DIRTY_BLOCK_WIDTH - 1) / DIRTY_BLOCK_WIDTH;
	_dirty_blocks = ReallocT<byte>(_dirty_blocks, _dirty_bytes_per_line * ((_screen.height + DIRTY_BLOCK_HEIGHT - 1) / DIRTY_BLOCK_HEIGHT));

	/* check the dirty rect */
	if (_invalid_rect.right >= _screen.width) _invalid_rect.right = _screen.width;
	if (_invalid_rect.bottom >= _screen.height) _invalid_rect.bottom = _screen.height;

	/* screen size changed and the old bitmap is invalid now, so we don't want to undraw it */
	_cursor.visible = false;
}

void UndrawMouseCursor()
{
	if (_cursor.visible) {
		Blitter *blitter = BlitterFactoryBase::GetCurrentBlitter();
		_cursor.visible = false;
		blitter->CopyFromBuffer(blitter->MoveTo(_screen.dst_ptr, _cursor.draw_pos.x, _cursor.draw_pos.y), _cursor_backup, _cursor.draw_size.x, _cursor.draw_size.y);
		_video_driver->MakeDirty(_cursor.draw_pos.x, _cursor.draw_pos.y, _cursor.draw_size.x, _cursor.draw_size.y);
	}
}

void DrawMouseCursor()
{
#if defined(WINCE)
	/* Don't ever draw the mouse for WinCE, as we work with a stylus */
	return;
#endif

	Blitter *blitter = BlitterFactoryBase::GetCurrentBlitter();
	int x;
	int y;
	int w;
	int h;

	/* Redraw mouse cursor but only when it's inside the window */
	if (!_cursor.in_window) return;

	/* Don't draw the mouse cursor if it's already drawn */
	if (_cursor.visible) {
		if (!_cursor.dirty) return;
		UndrawMouseCursor();
	}

	w = _cursor.size.x;
	x = _cursor.pos.x + _cursor.offs.x;
	if (x < 0) {
		w += x;
		x = 0;
	}
	if (w > _screen.width - x) w = _screen.width - x;
	if (w <= 0) return;
	_cursor.draw_pos.x = x;
	_cursor.draw_size.x = w;

	h = _cursor.size.y;
	y = _cursor.pos.y + _cursor.offs.y;
	if (y < 0) {
		h += y;
		y = 0;
	}
	if (h > _screen.height - y) h = _screen.height - y;
	if (h <= 0) return;
	_cursor.draw_pos.y = y;
	_cursor.draw_size.y = h;

	assert(blitter->BufferSize(w, h) < (int)sizeof(_cursor_backup));

	/* Make backup of stuff below cursor */
	blitter->CopyToBuffer(blitter->MoveTo(_screen.dst_ptr, _cursor.draw_pos.x, _cursor.draw_pos.y), _cursor_backup, _cursor.draw_size.x, _cursor.draw_size.y);

	/* Draw cursor on screen */
	_cur_dpi = &_screen;
	DrawSprite(_cursor.sprite, _cursor.pal, _cursor.pos.x, _cursor.pos.y);

	_video_driver->MakeDirty(_cursor.draw_pos.x, _cursor.draw_pos.y, _cursor.draw_size.x, _cursor.draw_size.y);

	_cursor.visible = true;
	_cursor.dirty = false;
}

void RedrawScreenRect(int left, int top, int right, int bottom)
{
	assert(right <= _screen.width && bottom <= _screen.height);
	if (_cursor.visible) {
		if (right > _cursor.draw_pos.x &&
				left < _cursor.draw_pos.x + _cursor.draw_size.x &&
				bottom > _cursor.draw_pos.y &&
				top < _cursor.draw_pos.y + _cursor.draw_size.y) {
			UndrawMouseCursor();
		}
	}
	UndrawChatMessage();

	DrawOverlappedWindowForAll(left, top, right, bottom);

	_video_driver->MakeDirty(left, top, right - left, bottom - top);
}

/*!
 * Repaints the rectangle blocks which are marked as 'dirty'.
 *
 * @see SetDirtyBlocks
 */
void DrawDirtyBlocks()
{
	byte *b = _dirty_blocks;
	const int w = Align(_screen.width,  DIRTY_BLOCK_WIDTH);
	const int h = Align(_screen.height, DIRTY_BLOCK_HEIGHT);
	int x;
	int y;

	if (IsGeneratingWorld() && !IsGeneratingWorldReadyForPaint()) return;

	y = 0;
	do {
		x = 0;
		do {
			if (*b != 0) {
				int left;
				int top;
				int right = x + DIRTY_BLOCK_WIDTH;
				int bottom = y;
				byte *p = b;
				int h2;

				/* First try coalescing downwards */
				do {
					*p = 0;
					p += _dirty_bytes_per_line;
					bottom += DIRTY_BLOCK_HEIGHT;
				} while (bottom != h && *p != 0);

				/* Try coalescing to the right too. */
				h2 = (bottom - y) / DIRTY_BLOCK_HEIGHT;
				assert(h2 > 0);
				p = b;

				while (right != w) {
					byte *p2 = ++p;
					int h = h2;
					/* Check if a full line of dirty flags is set. */
					do {
						if (!*p2) goto no_more_coalesc;
						p2 += _dirty_bytes_per_line;
					} while (--h != 0);

					/* Wohoo, can combine it one step to the right!
					 * Do that, and clear the bits. */
					right += DIRTY_BLOCK_WIDTH;

					h = h2;
					p2 = p;
					do {
						*p2 = 0;
						p2 += _dirty_bytes_per_line;
					} while (--h != 0);
				}
				no_more_coalesc:

				left = x;
				top = y;

				if (left   < _invalid_rect.left  ) left   = _invalid_rect.left;
				if (top    < _invalid_rect.top   ) top    = _invalid_rect.top;
				if (right  > _invalid_rect.right ) right  = _invalid_rect.right;
				if (bottom > _invalid_rect.bottom) bottom = _invalid_rect.bottom;

				if (left < right && top < bottom) {
					RedrawScreenRect(left, top, right, bottom);
				}

			}
		} while (b++, (x += DIRTY_BLOCK_WIDTH) != w);
	} while (b += -(w / DIRTY_BLOCK_WIDTH) + _dirty_bytes_per_line, (y += DIRTY_BLOCK_HEIGHT) != h);

	_invalid_rect.left = w;
	_invalid_rect.top = h;
	_invalid_rect.right = 0;
	_invalid_rect.bottom = 0;

	/* If we are generating a world, and waiting for a paint run, mark it here
	 *  as done painting, so we can continue generating. */
	if (IsGeneratingWorld() && IsGeneratingWorldReadyForPaint()) {
		SetGeneratingWorldPaintStatus(false);
	}
}

/*!
 * This function extends the internal _invalid_rect rectangle as it
 * now contains the rectangle defined by the given parameters. Note
 * the point (0,0) is top left.
 *
 * @param left The left edge of the rectangle
 * @param top The top edge of the rectangle
 * @param right The right edge of the rectangle
 * @param bottom The bottm edge of the rectangle
 * @see DrawDirtyBlocks
 *
 * @todo The name of the function should be called like @c AddDirtyBlock as
 *       it neither set a dirty rect nor add several dirty rects although
 *       the function name is in plural. (Progman)
 */
void SetDirtyBlocks(int left, int top, int right, int bottom)
{
	byte *b;
	int width;
	int height;

	if (left < 0) left = 0;
	if (top < 0) top = 0;
	if (right > _screen.width) right = _screen.width;
	if (bottom > _screen.height) bottom = _screen.height;

	if (left >= right || top >= bottom) return;

	if (left   < _invalid_rect.left  ) _invalid_rect.left   = left;
	if (top    < _invalid_rect.top   ) _invalid_rect.top    = top;
	if (right  > _invalid_rect.right ) _invalid_rect.right  = right;
	if (bottom > _invalid_rect.bottom) _invalid_rect.bottom = bottom;

	left /= DIRTY_BLOCK_WIDTH;
	top  /= DIRTY_BLOCK_HEIGHT;

	b = _dirty_blocks + top * _dirty_bytes_per_line + left;

	width  = ((right  - 1) / DIRTY_BLOCK_WIDTH)  - left + 1;
	height = ((bottom - 1) / DIRTY_BLOCK_HEIGHT) - top  + 1;

	assert(width > 0 && height > 0);

	do {
		int i = width;

		do b[--i] = 0xFF; while (i);

		b += _dirty_bytes_per_line;
	} while (--height != 0);
}

/*!
 * This function mark the whole screen as dirty. This results in repainting
 * the whole screen. Use this with care as this function will break the
 * idea about marking only parts of the screen as 'dirty'.
 */
void MarkWholeScreenDirty()
{
	SetDirtyBlocks(0, 0, _screen.width, _screen.height);
}

/** Set up a clipping area for only drawing into a certain area. To do this,
 * Fill a DrawPixelInfo object with the supplied relative rectangle, backup
 * the original (calling) _cur_dpi and assign the just returned DrawPixelInfo
 * _cur_dpi. When you are done, give restore _cur_dpi's original value
 * @param *n the DrawPixelInfo that will be the clipping rectangle box allowed
 * for drawing
 * @param left,top,width,height the relative coordinates of the clipping
 * rectangle relative to the current _cur_dpi. This will most likely be the
 * offset from the calling window coordinates
 * @return return false if the requested rectangle is not possible with the
 * current dpi pointer. Only continue of the return value is true, or you'll
 * get some nasty results */
bool FillDrawPixelInfo(DrawPixelInfo *n, int left, int top, int width, int height)
{
	Blitter *blitter = BlitterFactoryBase::GetCurrentBlitter();
	const DrawPixelInfo *o = _cur_dpi;

	n->zoom = ZOOM_LVL_NORMAL;

	assert(width > 0);
	assert(height > 0);

	if ((left -= o->left) < 0) {
		width += left;
		if (width <= 0) return false;
		n->left = -left;
		left = 0;
	} else {
		n->left = 0;
	}

	if (width > o->width - left) {
		width = o->width - left;
		if (width <= 0) return false;
	}
	n->width = width;

	if ((top -= o->top) < 0) {
		height += top;
		if (height <= 0) return false;
		n->top = -top;
		top = 0;
	} else {
		n->top = 0;
	}

	n->dst_ptr = blitter->MoveTo(o->dst_ptr, left, top);
	n->pitch = o->pitch;

	if (height > o->height - top) {
		height = o->height - top;
		if (height <= 0) return false;
	}
	n->height = height;

	return true;
}

static void SetCursorSprite(SpriteID cursor, SpriteID pal)
{
	CursorVars *cv = &_cursor;
	const Sprite *p;

	if (cv->sprite == cursor) return;

	p = GetSprite(GB(cursor, 0, SPRITE_WIDTH));
	cv->sprite = cursor;
	cv->pal    = pal;
	cv->size.y = p->height;
	cv->size.x = p->width;
	cv->offs.x = p->x_offs;
	cv->offs.y = p->y_offs;

	cv->dirty = true;
}

static void SwitchAnimatedCursor()
{
	const AnimCursor *cur = _cursor.animate_cur;

	if (cur == NULL || cur->sprite == AnimCursor::LAST) cur = _cursor.animate_list;

	SetCursorSprite(cur->sprite, _cursor.pal);

	_cursor.animate_timeout = cur->display_time;
	_cursor.animate_cur     = cur + 1;
}

void CursorTick()
{
	if (_cursor.animate_timeout != 0 && --_cursor.animate_timeout == 0)
		SwitchAnimatedCursor();
}

void SetMouseCursor(SpriteID sprite, SpriteID pal)
{
	/* Turn off animation */
	_cursor.animate_timeout = 0;
	/* Set cursor */
	SetCursorSprite(sprite, pal);
}

void SetAnimatedMouseCursor(const AnimCursor *table)
{
	_cursor.animate_list = table;
	_cursor.animate_cur = NULL;
	_cursor.pal = PAL_NONE;
	SwitchAnimatedCursor();
}

bool ChangeResInGame(int width, int height)
{
	return (_screen.width == width && _screen.height == height) || _video_driver->ChangeResolution(width, height);
}

bool ToggleFullScreen(bool fs)
{
	bool result = _video_driver->ToggleFullscreen(fs);
	if (_fullscreen != fs && _num_resolutions == 0) {
		DEBUG(driver, 0, "Could not find a suitable fullscreen resolution");
	}
	return result;
}

static int CDECL compare_res(const uint16 *pa, const uint16 *pb)
{
	int x = pa[0] - pb[0];
	if (x != 0) return x;
	return pa[1] - pb[1];
}

void SortResolutions(int count)
{
	QSortT((uint16*)_resolutions, count, compare_res);
}