summaryrefslogtreecommitdiff
path: root/src/screenshot.cpp
blob: 0e3bf3d8e2f5d608bbf2179c2a34de88384322d9 (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
/*
 * This file is part of OpenTTD.
 * OpenTTD 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, version 2.
 * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file screenshot.cpp The creation of screenshots! */

#include "stdafx.h"
#include "fileio_func.h"
#include "viewport_func.h"
#include "gfx_func.h"
#include "screenshot.h"
#include "blitter/factory.hpp"
#include "zoom_func.h"
#include "core/endian_func.hpp"
#include "saveload/saveload.h"
#include "company_base.h"
#include "company_func.h"
#include "strings_func.h"
#include "error.h"
#include "textbuf_gui.h"
#include "window_gui.h"
#include "window_func.h"
#include "tile_map.h"
#include "landscape.h"
#include "video/video_driver.hpp"

#include "table/strings.h"

#include "safeguards.h"

static const char * const SCREENSHOT_NAME = "screenshot"; ///< Default filename of a saved screenshot.
static const char * const HEIGHTMAP_NAME  = "heightmap";  ///< Default filename of a saved heightmap.

char _screenshot_format_name[8];      ///< Extension of the current screenshot format (corresponds with #_cur_screenshot_format).
uint _num_screenshot_formats;         ///< Number of available screenshot formats.
uint _cur_screenshot_format;          ///< Index of the currently selected screenshot format in #_screenshot_formats.
static char _screenshot_name[128];    ///< Filename of the screenshot file.
char _full_screenshot_name[MAX_PATH]; ///< Pathname of the screenshot file.
uint _heightmap_highest_peak;         ///< When saving a heightmap, this contains the highest peak on the map.

/**
 * Callback function signature for generating lines of pixel data to be written to the screenshot file.
 * @param userdata Pointer to user data.
 * @param buf      Destination buffer.
 * @param y        Line number of the first line to write.
 * @param pitch    Number of pixels to write (1 byte for 8bpp, 4 bytes for 32bpp). @see Colour
 * @param n        Number of lines to write.
 */
typedef void ScreenshotCallback(void *userdata, void *buf, uint y, uint pitch, uint n);

/**
 * Function signature for a screenshot generation routine for one of the available formats.
 * @param name        Filename, including extension.
 * @param callb       Callback function for generating lines of pixels.
 * @param userdata    User data, passed on to \a callb.
 * @param w           Width of the image in pixels.
 * @param h           Height of the image in pixels.
 * @param pixelformat Bits per pixel (bpp), either 8 or 32.
 * @param palette     %Colour palette (for 8bpp images).
 * @return File was written successfully.
 */
typedef bool ScreenshotHandlerProc(const char *name, ScreenshotCallback *callb, void *userdata, uint w, uint h, int pixelformat, const Colour *palette);

/** Screenshot format information. */
struct ScreenshotFormat {
	const char *extension;       ///< File extension.
	ScreenshotHandlerProc *proc; ///< Function for writing the screenshot.
};

#define MKCOLOUR(x)         TO_LE32X(x)

/*************************************************
 **** SCREENSHOT CODE FOR WINDOWS BITMAP (.BMP)
 *************************************************/

/** BMP File Header (stored in little endian) */
PACK(struct BitmapFileHeader {
	uint16 type;
	uint32 size;
	uint32 reserved;
	uint32 off_bits;
});
static_assert(sizeof(BitmapFileHeader) == 14);

/** BMP Info Header (stored in little endian) */
struct BitmapInfoHeader {
	uint32 size;
	int32 width, height;
	uint16 planes, bitcount;
	uint32 compression, sizeimage, xpels, ypels, clrused, clrimp;
};
static_assert(sizeof(BitmapInfoHeader) == 40);

/** Format of palette data in BMP header */
struct RgbQuad {
	byte blue, green, red, reserved;
};
static_assert(sizeof(RgbQuad) == 4);

/**
 * Generic .BMP writer
 * @param name file name including extension
 * @param callb callback used for gathering rendered image
 * @param userdata parameters forwarded to \a callb
 * @param w width in pixels
 * @param h height in pixels
 * @param pixelformat bits per pixel
 * @param palette colour palette (for 8bpp mode)
 * @return was everything ok?
 * @see ScreenshotHandlerProc
 */
static bool MakeBMPImage(const char *name, ScreenshotCallback *callb, void *userdata, uint w, uint h, int pixelformat, const Colour *palette)
{
	uint bpp; // bytes per pixel
	switch (pixelformat) {
		case 8:  bpp = 1; break;
		/* 32bpp mode is saved as 24bpp BMP */
		case 32: bpp = 3; break;
		/* Only implemented for 8bit and 32bit images so far */
		default: return false;
	}

	FILE *f = fopen(name, "wb");
	if (f == nullptr) return false;

	/* Each scanline must be aligned on a 32bit boundary */
	uint bytewidth = Align(w * bpp, 4); // bytes per line in file

	/* Size of palette. Only present for 8bpp mode */
	uint pal_size = pixelformat == 8 ? sizeof(RgbQuad) * 256 : 0;

	/* Setup the file header */
	BitmapFileHeader bfh;
	bfh.type = TO_LE16('MB');
	bfh.size = TO_LE32(sizeof(BitmapFileHeader) + sizeof(BitmapInfoHeader) + pal_size + bytewidth * h);
	bfh.reserved = 0;
	bfh.off_bits = TO_LE32(sizeof(BitmapFileHeader) + sizeof(BitmapInfoHeader) + pal_size);

	/* Setup the info header */
	BitmapInfoHeader bih;
	bih.size = TO_LE32(sizeof(BitmapInfoHeader));
	bih.width = TO_LE32(w);
	bih.height = TO_LE32(h);
	bih.planes = TO_LE16(1);
	bih.bitcount = TO_LE16(bpp * 8);
	bih.compression = 0;
	bih.sizeimage = 0;
	bih.xpels = 0;
	bih.ypels = 0;
	bih.clrused = 0;
	bih.clrimp = 0;

	/* Write file header and info header */
	if (fwrite(&bfh, sizeof(bfh), 1, f) != 1 || fwrite(&bih, sizeof(bih), 1, f) != 1) {
		fclose(f);
		return false;
	}

	if (pixelformat == 8) {
		/* Convert the palette to the windows format */
		RgbQuad rq[256];
		for (uint i = 0; i < 256; i++) {
			rq[i].red   = palette[i].r;
			rq[i].green = palette[i].g;
			rq[i].blue  = palette[i].b;
			rq[i].reserved = 0;
		}
		/* Write the palette */
		if (fwrite(rq, sizeof(rq), 1, f) != 1) {
			fclose(f);
			return false;
		}
	}

	/* Try to use 64k of memory, store between 16 and 128 lines */
	uint maxlines = Clamp(65536 / (w * pixelformat / 8), 16, 128); // number of lines per iteration

	uint8 *buff = MallocT<uint8>(maxlines * w * pixelformat / 8); // buffer which is rendered to
	uint8 *line = AllocaM(uint8, bytewidth); // one line, stored to file
	memset(line, 0, bytewidth);

	/* Start at the bottom, since bitmaps are stored bottom up */
	do {
		uint n = std::min(h, maxlines);
		h -= n;

		/* Render the pixels */
		callb(userdata, buff, h, w, n);

		/* Write each line */
		while (n-- != 0) {
			if (pixelformat == 8) {
				/* Move to 'line', leave last few pixels in line zeroed */
				memcpy(line, buff + n * w, w);
			} else {
				/* Convert from 'native' 32bpp to BMP-like 24bpp.
				 * Works for both big and little endian machines */
				Colour *src = ((Colour *)buff) + n * w;
				byte *dst = line;
				for (uint i = 0; i < w; i++) {
					dst[i * 3    ] = src[i].b;
					dst[i * 3 + 1] = src[i].g;
					dst[i * 3 + 2] = src[i].r;
				}
			}
			/* Write to file */
			if (fwrite(line, bytewidth, 1, f) != 1) {
				free(buff);
				fclose(f);
				return false;
			}
		}
	} while (h != 0);

	free(buff);
	fclose(f);

	return true;
}

/*********************************************************
 **** SCREENSHOT CODE FOR PORTABLE NETWORK GRAPHICS (.PNG)
 *********************************************************/
#if defined(WITH_PNG)
#include <png.h>

#ifdef PNG_TEXT_SUPPORTED
#include "rev.h"
#include "newgrf_config.h"
#include "ai/ai_info.hpp"
#include "company_base.h"
#include "base_media_base.h"
#endif /* PNG_TEXT_SUPPORTED */

static void PNGAPI png_my_error(png_structp png_ptr, png_const_charp message)
{
	DEBUG(misc, 0, "[libpng] error: %s - %s", message, (const char *)png_get_error_ptr(png_ptr));
	longjmp(png_jmpbuf(png_ptr), 1);
}

static void PNGAPI png_my_warning(png_structp png_ptr, png_const_charp message)
{
	DEBUG(misc, 1, "[libpng] warning: %s - %s", message, (const char *)png_get_error_ptr(png_ptr));
}

/**
 * Generic .PNG file image writer.
 * @param name        Filename, including extension.
 * @param callb       Callback function for generating lines of pixels.
 * @param userdata    User data, passed on to \a callb.
 * @param w           Width of the image in pixels.
 * @param h           Height of the image in pixels.
 * @param pixelformat Bits per pixel (bpp), either 8 or 32.
 * @param palette     %Colour palette (for 8bpp images).
 * @return File was written successfully.
 * @see ScreenshotHandlerProc
 */
static bool MakePNGImage(const char *name, ScreenshotCallback *callb, void *userdata, uint w, uint h, int pixelformat, const Colour *palette)
{
	png_color rq[256];
	FILE *f;
	uint i, y, n;
	uint maxlines;
	uint bpp = pixelformat / 8;
	png_structp png_ptr;
	png_infop info_ptr;

	/* only implemented for 8bit and 32bit images so far. */
	if (pixelformat != 8 && pixelformat != 32) return false;

	f = fopen(name, "wb");
	if (f == nullptr) return false;

	png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, const_cast<char *>(name), png_my_error, png_my_warning);

	if (png_ptr == nullptr) {
		fclose(f);
		return false;
	}

	info_ptr = png_create_info_struct(png_ptr);
	if (info_ptr == nullptr) {
		png_destroy_write_struct(&png_ptr, (png_infopp)nullptr);
		fclose(f);
		return false;
	}

	if (setjmp(png_jmpbuf(png_ptr))) {
		png_destroy_write_struct(&png_ptr, &info_ptr);
		fclose(f);
		return false;
	}

	png_init_io(png_ptr, f);

	png_set_filter(png_ptr, 0, PNG_FILTER_NONE);

	png_set_IHDR(png_ptr, info_ptr, w, h, 8, pixelformat == 8 ? PNG_COLOR_TYPE_PALETTE : PNG_COLOR_TYPE_RGB,
		PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);

#ifdef PNG_TEXT_SUPPORTED
	/* Try to add some game metadata to the PNG screenshot so
	 * it's more useful for debugging and archival purposes. */
	png_text_struct text[2];
	memset(text, 0, sizeof(text));
	text[0].key = const_cast<char *>("Software");
	text[0].text = const_cast<char *>(_openttd_revision);
	text[0].text_length = strlen(_openttd_revision);
	text[0].compression = PNG_TEXT_COMPRESSION_NONE;

	char buf[8192];
	char *p = buf;
	p += seprintf(p, lastof(buf), "Graphics set: %s (%u)\n", BaseGraphics::GetUsedSet()->name.c_str(), BaseGraphics::GetUsedSet()->version);
	p = strecpy(p, "NewGRFs:\n", lastof(buf));
	for (const GRFConfig *c = _game_mode == GM_MENU ? nullptr : _grfconfig; c != nullptr; c = c->next) {
		p += seprintf(p, lastof(buf), "%08X ", BSWAP32(c->ident.grfid));
		p = md5sumToString(p, lastof(buf), c->ident.md5sum);
		p += seprintf(p, lastof(buf), " %s\n", c->filename);
	}
	p = strecpy(p, "\nCompanies:\n", lastof(buf));
	for (const Company *c : Company::Iterate()) {
		if (c->ai_info == nullptr) {
			p += seprintf(p, lastof(buf), "%2i: Human\n", (int)c->index);
		} else {
			p += seprintf(p, lastof(buf), "%2i: %s (v%d)\n", (int)c->index, c->ai_info->GetName(), c->ai_info->GetVersion());
		}
	}
	text[1].key = const_cast<char *>("Description");
	text[1].text = buf;
	text[1].text_length = p - buf;
	text[1].compression = PNG_TEXT_COMPRESSION_zTXt;
	png_set_text(png_ptr, info_ptr, text, 2);
#endif /* PNG_TEXT_SUPPORTED */

	if (pixelformat == 8) {
		/* convert the palette to the .PNG format. */
		for (i = 0; i != 256; i++) {
			rq[i].red   = palette[i].r;
			rq[i].green = palette[i].g;
			rq[i].blue  = palette[i].b;
		}

		png_set_PLTE(png_ptr, info_ptr, rq, 256);
	}

	png_write_info(png_ptr, info_ptr);
	png_set_flush(png_ptr, 512);

	if (pixelformat == 32) {
		png_color_8 sig_bit;

		/* Save exact colour/alpha resolution */
		sig_bit.alpha = 0;
		sig_bit.blue  = 8;
		sig_bit.green = 8;
		sig_bit.red   = 8;
		sig_bit.gray  = 8;
		png_set_sBIT(png_ptr, info_ptr, &sig_bit);

#if TTD_ENDIAN == TTD_LITTLE_ENDIAN
		png_set_bgr(png_ptr);
		png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
#else
		png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
#endif /* TTD_ENDIAN == TTD_LITTLE_ENDIAN */
	}

	/* use by default 64k temp memory */
	maxlines = Clamp(65536 / w, 16, 128);

	/* now generate the bitmap bits */
	void *buff = CallocT<uint8>(w * maxlines * bpp); // by default generate 128 lines at a time.

	y = 0;
	do {
		/* determine # lines to write */
		n = std::min(h - y, maxlines);

		/* render the pixels into the buffer */
		callb(userdata, buff, y, w, n);
		y += n;

		/* write them to png */
		for (i = 0; i != n; i++) {
			png_write_row(png_ptr, (png_bytep)buff + i * w * bpp);
		}
	} while (y != h);

	png_write_end(png_ptr, info_ptr);
	png_destroy_write_struct(&png_ptr, &info_ptr);

	free(buff);
	fclose(f);
	return true;
}
#endif /* WITH_PNG */


/*************************************************
 **** SCREENSHOT CODE FOR ZSOFT PAINTBRUSH (.PCX)
 *************************************************/

/** Definition of a PCX file header. */
struct PcxHeader {
	byte manufacturer;
	byte version;
	byte rle;
	byte bpp;
	uint32 unused;
	uint16 xmax, ymax;
	uint16 hdpi, vdpi;
	byte pal_small[16 * 3];
	byte reserved;
	byte planes;
	uint16 pitch;
	uint16 cpal;
	uint16 width;
	uint16 height;
	byte filler[54];
};
static_assert(sizeof(PcxHeader) == 128);

/**
 * Generic .PCX file image writer.
 * @param name        Filename, including extension.
 * @param callb       Callback function for generating lines of pixels.
 * @param userdata    User data, passed on to \a callb.
 * @param w           Width of the image in pixels.
 * @param h           Height of the image in pixels.
 * @param pixelformat Bits per pixel (bpp), either 8 or 32.
 * @param palette     %Colour palette (for 8bpp images).
 * @return File was written successfully.
 * @see ScreenshotHandlerProc
 */
static bool MakePCXImage(const char *name, ScreenshotCallback *callb, void *userdata, uint w, uint h, int pixelformat, const Colour *palette)
{
	FILE *f;
	uint maxlines;
	uint y;
	PcxHeader pcx;
	bool success;

	if (pixelformat == 32) {
		DEBUG(misc, 0, "Can't convert a 32bpp screenshot to PCX format. Please pick another format.");
		return false;
	}
	if (pixelformat != 8 || w == 0) return false;

	f = fopen(name, "wb");
	if (f == nullptr) return false;

	memset(&pcx, 0, sizeof(pcx));

	/* setup pcx header */
	pcx.manufacturer = 10;
	pcx.version = 5;
	pcx.rle = 1;
	pcx.bpp = 8;
	pcx.xmax = TO_LE16(w - 1);
	pcx.ymax = TO_LE16(h - 1);
	pcx.hdpi = TO_LE16(320);
	pcx.vdpi = TO_LE16(320);

	pcx.planes = 1;
	pcx.cpal = TO_LE16(1);
	pcx.width = pcx.pitch = TO_LE16(w);
	pcx.height = TO_LE16(h);

	/* write pcx header */
	if (fwrite(&pcx, sizeof(pcx), 1, f) != 1) {
		fclose(f);
		return false;
	}

	/* use by default 64k temp memory */
	maxlines = Clamp(65536 / w, 16, 128);

	/* now generate the bitmap bits */
	uint8 *buff = CallocT<uint8>(w * maxlines); // by default generate 128 lines at a time.

	y = 0;
	do {
		/* determine # lines to write */
		uint n = std::min(h - y, maxlines);
		uint i;

		/* render the pixels into the buffer */
		callb(userdata, buff, y, w, n);
		y += n;

		/* write them to pcx */
		for (i = 0; i != n; i++) {
			const uint8 *bufp = buff + i * w;
			byte runchar = bufp[0];
			uint runcount = 1;
			uint j;

			/* for each pixel... */
			for (j = 1; j < w; j++) {
				uint8 ch = bufp[j];

				if (ch != runchar || runcount >= 0x3f) {
					if (runcount > 1 || (runchar & 0xC0) == 0xC0) {
						if (fputc(0xC0 | runcount, f) == EOF) {
							free(buff);
							fclose(f);
							return false;
						}
					}
					if (fputc(runchar, f) == EOF) {
						free(buff);
						fclose(f);
						return false;
					}
					runcount = 0;
					runchar = ch;
				}
				runcount++;
			}

			/* write remaining bytes.. */
			if (runcount > 1 || (runchar & 0xC0) == 0xC0) {
				if (fputc(0xC0 | runcount, f) == EOF) {
					free(buff);
					fclose(f);
					return false;
				}
			}
			if (fputc(runchar, f) == EOF) {
				free(buff);
				fclose(f);
				return false;
			}
		}
	} while (y != h);

	free(buff);

	/* write 8-bit colour palette */
	if (fputc(12, f) == EOF) {
		fclose(f);
		return false;
	}

	/* Palette is word-aligned, copy it to a temporary byte array */
	byte tmp[256 * 3];

	for (uint i = 0; i < 256; i++) {
		tmp[i * 3 + 0] = palette[i].r;
		tmp[i * 3 + 1] = palette[i].g;
		tmp[i * 3 + 2] = palette[i].b;
	}
	success = fwrite(tmp, sizeof(tmp), 1, f) == 1;

	fclose(f);

	return success;
}

/*************************************************
 **** GENERIC SCREENSHOT CODE
 *************************************************/

/** Available screenshot formats. */
static const ScreenshotFormat _screenshot_formats[] = {
#if defined(WITH_PNG)
	{"png", &MakePNGImage},
#endif
	{"bmp", &MakeBMPImage},
	{"pcx", &MakePCXImage},
};

/** Get filename extension of current screenshot file format. */
const char *GetCurrentScreenshotExtension()
{
	return _screenshot_formats[_cur_screenshot_format].extension;
}

/** Initialize screenshot format information on startup, with #_screenshot_format_name filled from the loadsave code. */
void InitializeScreenshotFormats()
{
	uint j = 0;
	for (uint i = 0; i < lengthof(_screenshot_formats); i++) {
		if (!strcmp(_screenshot_format_name, _screenshot_formats[i].extension)) {
			j = i;
			break;
		}
	}
	_cur_screenshot_format = j;
	_num_screenshot_formats = lengthof(_screenshot_formats);
}

/**
 * Callback of the screenshot generator that dumps the current video buffer.
 * @see ScreenshotCallback
 */
static void CurrentScreenCallback(void *userdata, void *buf, uint y, uint pitch, uint n)
{
	Blitter *blitter = BlitterFactory::GetCurrentBlitter();
	void *src = blitter->MoveTo(_screen.dst_ptr, 0, y);
	blitter->CopyImageToBuffer(src, buf, _screen.width, n, pitch);
}

/**
 * generate a large piece of the world
 * @param userdata Viewport area to draw
 * @param buf Videobuffer with same bitdepth as current blitter
 * @param y First line to render
 * @param pitch Pitch of the videobuffer
 * @param n Number of lines to render
 */
static void LargeWorldCallback(void *userdata, void *buf, uint y, uint pitch, uint n)
{
	Viewport *vp = (Viewport *)userdata;
	DrawPixelInfo dpi, *old_dpi;
	int wx, left;

	/* We are no longer rendering to the screen */
	DrawPixelInfo old_screen = _screen;
	bool old_disable_anim = _screen_disable_anim;

	_screen.dst_ptr = buf;
	_screen.width = pitch;
	_screen.height = n;
	_screen.pitch = pitch;
	_screen_disable_anim = true;

	old_dpi = _cur_dpi;
	_cur_dpi = &dpi;

	dpi.dst_ptr = buf;
	dpi.height = n;
	dpi.width = vp->width;
	dpi.pitch = pitch;
	dpi.zoom = ZOOM_LVL_WORLD_SCREENSHOT;
	dpi.left = 0;
	dpi.top = y;

	/* Render viewport in blocks of 1600 pixels width */
	left = 0;
	while (vp->width - left != 0) {
		wx = std::min(vp->width - left, 1600);
		left += wx;

		ViewportDoDraw(vp,
			ScaleByZoom(left - wx - vp->left, vp->zoom) + vp->virtual_left,
			ScaleByZoom(y - vp->top, vp->zoom) + vp->virtual_top,
			ScaleByZoom(left - vp->left, vp->zoom) + vp->virtual_left,
			ScaleByZoom((y + n) - vp->top, vp->zoom) + vp->virtual_top
		);
	}

	_cur_dpi = old_dpi;

	/* Switch back to rendering to the screen */
	_screen = old_screen;
	_screen_disable_anim = old_disable_anim;
}

/**
 * Construct a pathname for a screenshot file.
 * @param default_fn Default filename.
 * @param ext        Extension to use.
 * @param crashlog   Create path for crash.png
 * @return Pathname for a screenshot file.
 */
static const char *MakeScreenshotName(const char *default_fn, const char *ext, bool crashlog = false)
{
	bool generate = StrEmpty(_screenshot_name);

	if (generate) {
		if (_game_mode == GM_EDITOR || _game_mode == GM_MENU || _local_company == COMPANY_SPECTATOR) {
			strecpy(_screenshot_name, default_fn, lastof(_screenshot_name));
		} else {
			GenerateDefaultSaveName(_screenshot_name, lastof(_screenshot_name));
		}
	}

	/* Add extension to screenshot file */
	size_t len = strlen(_screenshot_name);
	seprintf(&_screenshot_name[len], lastof(_screenshot_name), ".%s", ext);

	const char *screenshot_dir = crashlog ? _personal_dir.c_str() : FiosGetScreenshotDir();

	for (uint serial = 1;; serial++) {
		if (seprintf(_full_screenshot_name, lastof(_full_screenshot_name), "%s%s", screenshot_dir, _screenshot_name) >= (int)lengthof(_full_screenshot_name)) {
			/* We need more characters than MAX_PATH -> end with error */
			_full_screenshot_name[0] = '\0';
			break;
		}
		if (!generate) break; // allow overwriting of non-automatic filenames
		if (!FileExists(_full_screenshot_name)) break;
		/* If file exists try another one with same name, but just with a higher index */
		seprintf(&_screenshot_name[len], lastof(_screenshot_name) - len, "#%u.%s", serial, ext);
	}

	return _full_screenshot_name;
}

/** Make a screenshot of the current screen. */
static bool MakeSmallScreenshot(bool crashlog)
{
	const ScreenshotFormat *sf = _screenshot_formats + _cur_screenshot_format;
	return sf->proc(MakeScreenshotName(SCREENSHOT_NAME, sf->extension, crashlog), CurrentScreenCallback, nullptr, _screen.width, _screen.height,
			BlitterFactory::GetCurrentBlitter()->GetScreenDepth(), _cur_palette.palette);
}

/**
 * Configure a Viewport for rendering (a part of) the map into a screenshot.
 * @param t Screenshot type
 * @param width the width of the screenshot, or 0 for current viewport width (needs to be 0 with SC_VIEWPORT, SC_CRASHLOG, and SC_WORLD).
 * @param height the height of the screenshot, or 0 for current viewport height (needs to be 0 with SC_VIEWPORT, SC_CRASHLOG, and SC_WORLD).
 * @param[out] vp Result viewport
 */
void SetupScreenshotViewport(ScreenshotType t, Viewport *vp, uint32 width, uint32 height)
{
	switch(t) {
		case SC_VIEWPORT:
		case SC_CRASHLOG: {
			assert(width == 0 && height == 0);

			Window *w = FindWindowById(WC_MAIN_WINDOW, 0);
			vp->virtual_left   = w->viewport->virtual_left;
			vp->virtual_top    = w->viewport->virtual_top;
			vp->virtual_width  = w->viewport->virtual_width;
			vp->virtual_height = w->viewport->virtual_height;

			/* Compute pixel coordinates */
			vp->left = 0;
			vp->top = 0;
			vp->width = _screen.width;
			vp->height = _screen.height;
			vp->overlay = w->viewport->overlay;
			break;
		}
		case SC_WORLD: {
			assert(width == 0 && height == 0);

			/* Determine world coordinates of screenshot */
			vp->zoom = ZOOM_LVL_WORLD_SCREENSHOT;

			TileIndex north_tile = _settings_game.construction.freeform_edges ? TileXY(1, 1) : TileXY(0, 0);
			TileIndex south_tile = MapSize() - 1;

			/* We need to account for a hill or high building at tile 0,0. */
			int extra_height_top = TilePixelHeight(north_tile) + 150;
			/* If there is a hill at the bottom don't create a large black area. */
			int reclaim_height_bottom = TilePixelHeight(south_tile);

			vp->virtual_left   = RemapCoords(TileX(south_tile) * TILE_SIZE, TileY(north_tile) * TILE_SIZE, 0).x;
			vp->virtual_top    = RemapCoords(TileX(north_tile) * TILE_SIZE, TileY(north_tile) * TILE_SIZE, extra_height_top).y;
			vp->virtual_width  = RemapCoords(TileX(north_tile) * TILE_SIZE, TileY(south_tile) * TILE_SIZE, 0).x                     - vp->virtual_left + 1;
			vp->virtual_height = RemapCoords(TileX(south_tile) * TILE_SIZE, TileY(south_tile) * TILE_SIZE, reclaim_height_bottom).y - vp->virtual_top  + 1;

			/* Compute pixel coordinates */
			vp->left = 0;
			vp->top = 0;
			vp->width  = UnScaleByZoom(vp->virtual_width,  vp->zoom);
			vp->height = UnScaleByZoom(vp->virtual_height, vp->zoom);
			vp->overlay = nullptr;
			break;
		}
		default: {
			vp->zoom = (t == SC_ZOOMEDIN) ? _settings_client.gui.zoom_min : ZOOM_LVL_VIEWPORT;

			Window *w = FindWindowById(WC_MAIN_WINDOW, 0);
			vp->virtual_left   = w->viewport->virtual_left;
			vp->virtual_top    = w->viewport->virtual_top;

			if (width == 0 || height == 0) {
				vp->virtual_width  = w->viewport->virtual_width;
				vp->virtual_height = w->viewport->virtual_height;
			} else {
				vp->virtual_width = width << vp->zoom;
				vp->virtual_height = height << vp->zoom;
			}

			/* Compute pixel coordinates */
			vp->left = 0;
			vp->top = 0;
			vp->width  = UnScaleByZoom(vp->virtual_width,  vp->zoom);
			vp->height = UnScaleByZoom(vp->virtual_height, vp->zoom);
			vp->overlay = nullptr;
			break;
		}
	}
}

/**
 * Make a screenshot of the map.
 * @param t Screenshot type: World or viewport screenshot
 * @param width the width of the screenshot of, or 0 for current viewport width.
 * @param height the height of the screenshot of, or 0 for current viewport height.
 * @return true on success
 */
static bool MakeLargeWorldScreenshot(ScreenshotType t, uint32 width = 0, uint32 height = 0)
{
	Viewport vp;
	SetupScreenshotViewport(t, &vp, width, height);

	const ScreenshotFormat *sf = _screenshot_formats + _cur_screenshot_format;
	return sf->proc(MakeScreenshotName(SCREENSHOT_NAME, sf->extension), LargeWorldCallback, &vp, vp.width, vp.height,
			BlitterFactory::GetCurrentBlitter()->GetScreenDepth(), _cur_palette.palette);
}

/**
 * Callback for generating a heightmap. Supports 8bpp grayscale only.
 * @param userdata Pointer to user data.
 * @param buffer   Destination buffer.
 * @param y        Line number of the first line to write.
 * @param pitch    Number of pixels to write (1 byte for 8bpp, 4 bytes for 32bpp). @see Colour
 * @param n        Number of lines to write.
 * @see ScreenshotCallback
 */
static void HeightmapCallback(void *userdata, void *buffer, uint y, uint pitch, uint n)
{
	byte *buf = (byte *)buffer;
	while (n > 0) {
		TileIndex ti = TileXY(MapMaxX(), y);
		for (uint x = MapMaxX(); true; x--) {
			*buf = 256 * TileHeight(ti) / (1 + _heightmap_highest_peak);
			buf++;
			if (x == 0) break;
			ti = TILE_ADDXY(ti, -1, 0);
		}
		y++;
		n--;
	}
}

/**
 * Make a heightmap of the current map.
 * @param filename Filename to use for saving.
 */
bool MakeHeightmapScreenshot(const char *filename)
{
	Colour palette[256];
	for (uint i = 0; i < lengthof(palette); i++) {
		palette[i].a = 0xff;
		palette[i].r = i;
		palette[i].g = i;
		palette[i].b = i;
	}

	_heightmap_highest_peak = 0;
	for (TileIndex tile = 0; tile < MapSize(); tile++) {
		uint h = TileHeight(tile);
		_heightmap_highest_peak = std::max(h, _heightmap_highest_peak);
	}

	const ScreenshotFormat *sf = _screenshot_formats + _cur_screenshot_format;
	return sf->proc(filename, HeightmapCallback, nullptr, MapSizeX(), MapSizeY(), 8, palette);
}

static ScreenshotType _confirmed_screenshot_type; ///< Screenshot type the current query is about to confirm.

/**
 * Callback on the confirmation window for huge screenshots.
 * @param w Window with viewport
 * @param confirmed true on confirmation
 */
static void ScreenshotConfirmationCallback(Window *w, bool confirmed)
{
	if (confirmed) MakeScreenshot(_confirmed_screenshot_type, {});
}

/**
 * Make a screenshot.
 * Ask for confirmation first if the screenshot will be huge.
 * @param t Screenshot type: World, defaultzoom, heightmap or viewport screenshot
 * @see MakeScreenshot
 */
void MakeScreenshotWithConfirm(ScreenshotType t)
{
	Viewport vp;
	SetupScreenshotViewport(t, &vp);

	bool heightmap_or_minimap = t == SC_HEIGHTMAP || t == SC_MINIMAP;
	uint64_t width = (heightmap_or_minimap ? MapSizeX() : vp.width);
	uint64_t height = (heightmap_or_minimap ? MapSizeY() : vp.height);

	if (width * height > 8192 * 8192) {
		/* Ask for confirmation */
		_confirmed_screenshot_type = t;
		SetDParam(0, width);
		SetDParam(1, height);
		ShowQuery(STR_WARNING_SCREENSHOT_SIZE_CAPTION, STR_WARNING_SCREENSHOT_SIZE_MESSAGE, nullptr, ScreenshotConfirmationCallback);
	} else {
		/* Less than 64M pixels, just do it */
		MakeScreenshot(t, {});
	}
}

/**
 * Make a screenshot.
 * @param t    the type of screenshot to make.
 * @param name the name to give to the screenshot.
 * @param width the width of the screenshot of, or 0 for current viewport width (only works for SC_ZOOMEDIN and SC_DEFAULTZOOM).
 * @param height the height of the screenshot of, or 0 for current viewport height (only works for SC_ZOOMEDIN and SC_DEFAULTZOOM).
 * @return true iff the screenshot was made successfully
 */
static bool RealMakeScreenshot(ScreenshotType t, std::string name, uint32 width, uint32 height)
{
	if (t == SC_VIEWPORT) {
		/* First draw the dirty parts of the screen and only then change the name
		 * of the screenshot. This way the screenshot will always show the name
		 * of the previous screenshot in the 'successful' message instead of the
		 * name of the new screenshot (or an empty name). */
		UndrawMouseCursor();
		DrawDirtyBlocks();
	}

	_screenshot_name[0] = '\0';
	if (!name.empty()) strecpy(_screenshot_name, name.c_str(), lastof(_screenshot_name));

	bool ret;
	switch (t) {
		case SC_VIEWPORT:
			ret = MakeSmallScreenshot(false);
			break;

		case SC_CRASHLOG:
			ret = MakeSmallScreenshot(true);
			break;

		case SC_ZOOMEDIN:
		case SC_DEFAULTZOOM:
			ret = MakeLargeWorldScreenshot(t, width, height);
			break;

		case SC_WORLD:
			ret = MakeLargeWorldScreenshot(t);
			break;

		case SC_HEIGHTMAP: {
			const ScreenshotFormat *sf = _screenshot_formats + _cur_screenshot_format;
			ret = MakeHeightmapScreenshot(MakeScreenshotName(HEIGHTMAP_NAME, sf->extension));
			break;
		}

		case SC_MINIMAP:
			ret = MakeMinimapWorldScreenshot();
			break;

		default:
			NOT_REACHED();
	}

	if (ret) {
		if (t == SC_HEIGHTMAP) {
			SetDParamStr(0, _screenshot_name);
			SetDParam(1, _heightmap_highest_peak);
			ShowErrorMessage(STR_MESSAGE_HEIGHTMAP_SUCCESSFULLY, INVALID_STRING_ID, WL_WARNING);
		} else {
			SetDParamStr(0, _screenshot_name);
			ShowErrorMessage(STR_MESSAGE_SCREENSHOT_SUCCESSFULLY, INVALID_STRING_ID, WL_WARNING);
		}
	} else {
		ShowErrorMessage(STR_ERROR_SCREENSHOT_FAILED, INVALID_STRING_ID, WL_ERROR);
	}

	return ret;
}

/**
 * Schedule making a screenshot.
 * Unconditionally take a screenshot of the requested type.
 * @param t    the type of screenshot to make.
 * @param name the name to give to the screenshot.
 * @param width the width of the screenshot of, or 0 for current viewport width (only works for SC_ZOOMEDIN and SC_DEFAULTZOOM).
 * @param height the height of the screenshot of, or 0 for current viewport height (only works for SC_ZOOMEDIN and SC_DEFAULTZOOM).
 * @return true iff the screenshot was successfully made.
 * @see MakeScreenshotWithConfirm
 */
bool MakeScreenshot(ScreenshotType t, std::string name, uint32 width, uint32 height)
{
	if (t == SC_CRASHLOG) {
		/* Video buffer might or might not be locked. */
		VideoDriver::VideoBufferLocker lock;

		return RealMakeScreenshot(t, name, width, height);
	}

	VideoDriver::GetInstance()->QueueOnMainThread([=] { // Capture by value to not break scope.
		RealMakeScreenshot(t, name, width, height);
	});

	return true;
}


/**
 * Return the owner of a tile to display it with in the small map in mode "Owner".
 *
 * @param tile The tile of which we would like to get the colour.
 * @return The owner of tile in the small map in mode "Owner"
 */
static Owner GetMinimapOwner(TileIndex tile)
{
	Owner o;

	if (IsTileType(tile, MP_VOID)) {
		return OWNER_END;
	} else {
		switch (GetTileType(tile)) {
		case MP_INDUSTRY: o = OWNER_DEITY;        break;
		case MP_HOUSE:    o = OWNER_TOWN;         break;
		default:          o = GetTileOwner(tile); break;
			/* FIXME: For MP_ROAD there are multiple owners.
			 * GetTileOwner returns the rail owner (level crossing) resp. the owner of ROADTYPE_ROAD (normal road),
			 * even if there are no ROADTYPE_ROAD bits on the tile.
			 */
		}

		return o;
	}
}

static void MinimapScreenCallback(void *userdata, void *buf, uint y, uint pitch, uint n)
{
	/* Fill with the company colours */
	byte owner_colours[OWNER_END + 1];
	for (const Company *c : Company::Iterate()) {
		owner_colours[c->index] = MKCOLOUR(_colour_gradient[c->colour][5]);
	}

	/* Fill with some special colours */
	owner_colours[OWNER_TOWN]    = PC_DARK_RED;
	owner_colours[OWNER_NONE]    = PC_GRASS_LAND;
	owner_colours[OWNER_WATER]   = PC_WATER;
	owner_colours[OWNER_DEITY]   = PC_DARK_GREY; // industry
	owner_colours[OWNER_END]     = PC_BLACK;

	uint32 *ubuf = (uint32 *)buf;
	uint num = (pitch * n);
	for (uint i = 0; i < num; i++) {
		uint row = y + (int)(i / pitch);
		uint col = (MapSizeX() - 1) - (i % pitch);

		TileIndex tile = TileXY(col, row);
		Owner o = GetMinimapOwner(tile);
		byte val = owner_colours[o];

		uint32 colour_buf = 0;
		colour_buf  = (_cur_palette.palette[val].b << 0);
		colour_buf |= (_cur_palette.palette[val].g << 8);
		colour_buf |= (_cur_palette.palette[val].r << 16);

		*ubuf = colour_buf;
		ubuf++;   // Skip alpha
	}
}

/**
 * Make a minimap screenshot.
 */
bool MakeMinimapWorldScreenshot()
{
	const ScreenshotFormat *sf = _screenshot_formats + _cur_screenshot_format;
	return sf->proc(MakeScreenshotName(SCREENSHOT_NAME, sf->extension), MinimapScreenCallback, nullptr, MapSizeX(), MapSizeY(), 32, _cur_palette.palette);
}