Repository navigation
Expand file tree
/
Copy pathSDL_pixels.c
More file actions
1182 lines (1071 loc) · 33.3 KB
/
Copy pathSDL_pixels.c
File metadata and controls
1182 lines (1071 loc) · 33.3 KB
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
/*
Simple DirectMedia Layer
Copyright (C) 1997-2026 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../SDL_internal.h"
/* General (mostly internal) pixel/color manipulation routines for SDL */
#include "SDL_endian.h"
#include "SDL_video.h"
#include "SDL_sysvideo.h"
#include "SDL_blit.h"
#include "SDL_pixels_c.h"
#include "SDL_RLEaccel_c.h"
#include "../SDL_list.h"
/* Lookup tables to expand partial bytes to the full 0..255 range */
static Uint8 lookup_0[] = {
0, 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
};
static Uint8 lookup_1[] = {
0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 142, 144, 146, 148, 150, 152, 154, 156, 158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180, 182, 184, 186, 188, 190, 192, 194, 196, 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 220, 222, 224, 226, 228, 230, 232, 234, 236, 238, 240, 242, 244, 246, 248, 250, 252, 255
};
static Uint8 lookup_2[] = {
0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 85, 89, 93, 97, 101, 105, 109, 113, 117, 121, 125, 129, 133, 137, 141, 145, 149, 153, 157, 161, 165, 170, 174, 178, 182, 186, 190, 194, 198, 202, 206, 210, 214, 218, 222, 226, 230, 234, 238, 242, 246, 250, 255
};
static Uint8 lookup_3[] = {
0, 8, 16, 24, 32, 41, 49, 57, 65, 74, 82, 90, 98, 106, 115, 123, 131, 139, 148, 156, 164, 172, 180, 189, 197, 205, 213, 222, 230, 238, 246, 255
};
static Uint8 lookup_4[] = {
0, 17, 34, 51, 68, 85, 102, 119, 136, 153, 170, 187, 204, 221, 238, 255
};
static Uint8 lookup_5[] = {
0, 36, 72, 109, 145, 182, 218, 255
};
static Uint8 lookup_6[] = {
0, 85, 170, 255
};
static Uint8 lookup_7[] = {
0, 255
};
static Uint8 lookup_8[] = {
255
};
Uint8 *SDL_expand_byte[9] = {
lookup_0,
lookup_1,
lookup_2,
lookup_3,
lookup_4,
lookup_5,
lookup_6,
lookup_7,
lookup_8
};
/* Helper functions */
#define CASE(X) \
case X: \
return #X;
const char *SDL_GetPixelFormatName(Uint32 format)
{
switch (format) {
CASE(SDL_PIXELFORMAT_INDEX1LSB)
CASE(SDL_PIXELFORMAT_INDEX1MSB)
CASE(SDL_PIXELFORMAT_INDEX2LSB)
CASE(SDL_PIXELFORMAT_INDEX2MSB)
CASE(SDL_PIXELFORMAT_INDEX4LSB)
CASE(SDL_PIXELFORMAT_INDEX4MSB)
CASE(SDL_PIXELFORMAT_INDEX8)
CASE(SDL_PIXELFORMAT_RGB332)
CASE(SDL_PIXELFORMAT_RGB444)
CASE(SDL_PIXELFORMAT_BGR444)
CASE(SDL_PIXELFORMAT_RGB555)
CASE(SDL_PIXELFORMAT_BGR555)
CASE(SDL_PIXELFORMAT_ARGB4444)
CASE(SDL_PIXELFORMAT_RGBA4444)
CASE(SDL_PIXELFORMAT_ABGR4444)
CASE(SDL_PIXELFORMAT_BGRA4444)
CASE(SDL_PIXELFORMAT_ARGB1555)
CASE(SDL_PIXELFORMAT_RGBA5551)
CASE(SDL_PIXELFORMAT_ABGR1555)
CASE(SDL_PIXELFORMAT_BGRA5551)
CASE(SDL_PIXELFORMAT_RGB565)
CASE(SDL_PIXELFORMAT_BGR565)
CASE(SDL_PIXELFORMAT_RGB24)
CASE(SDL_PIXELFORMAT_BGR24)
CASE(SDL_PIXELFORMAT_RGB888)
CASE(SDL_PIXELFORMAT_RGBX8888)
CASE(SDL_PIXELFORMAT_BGR888)
CASE(SDL_PIXELFORMAT_BGRX8888)
CASE(SDL_PIXELFORMAT_ARGB8888)
CASE(SDL_PIXELFORMAT_RGBA8888)
CASE(SDL_PIXELFORMAT_ABGR8888)
CASE(SDL_PIXELFORMAT_BGRA8888)
CASE(SDL_PIXELFORMAT_ARGB2101010)
CASE(SDL_PIXELFORMAT_YV12)
CASE(SDL_PIXELFORMAT_IYUV)
CASE(SDL_PIXELFORMAT_YUY2)
CASE(SDL_PIXELFORMAT_UYVY)
CASE(SDL_PIXELFORMAT_YVYU)
CASE(SDL_PIXELFORMAT_NV12)
CASE(SDL_PIXELFORMAT_NV21)
CASE(SDL_PIXELFORMAT_EXTERNAL_OES)
default:
return "SDL_PIXELFORMAT_UNKNOWN";
}
}
#undef CASE
SDL_bool SDL_PixelFormatEnumToMasks(Uint32 format, int *bpp, Uint32 *Rmask,
Uint32 *Gmask, Uint32 *Bmask, Uint32 *Amask)
{
Uint32 masks[4];
/* This function doesn't work with FourCC pixel formats */
if (SDL_ISPIXELFORMAT_FOURCC(format)) {
SDL_SetError("FOURCC pixel formats are not supported");
return SDL_FALSE;
}
/* Initialize the values here */
if (SDL_BYTESPERPIXEL(format) <= 2) {
*bpp = SDL_BITSPERPIXEL(format);
} else {
*bpp = SDL_BYTESPERPIXEL(format) * 8;
}
*Rmask = *Gmask = *Bmask = *Amask = 0;
if (format == SDL_PIXELFORMAT_RGB24) {
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
*Rmask = 0x00FF0000;
*Gmask = 0x0000FF00;
*Bmask = 0x000000FF;
#else
*Rmask = 0x000000FF;
*Gmask = 0x0000FF00;
*Bmask = 0x00FF0000;
#endif
return SDL_TRUE;
}
if (format == SDL_PIXELFORMAT_BGR24) {
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
*Rmask = 0x000000FF;
*Gmask = 0x0000FF00;
*Bmask = 0x00FF0000;
#else
*Rmask = 0x00FF0000;
*Gmask = 0x0000FF00;
*Bmask = 0x000000FF;
#endif
return SDL_TRUE;
}
if (SDL_PIXELTYPE(format) != SDL_PIXELTYPE_PACKED8 &&
SDL_PIXELTYPE(format) != SDL_PIXELTYPE_PACKED16 &&
SDL_PIXELTYPE(format) != SDL_PIXELTYPE_PACKED32) {
/* Not a format that uses masks */
return SDL_TRUE;
}
switch (SDL_PIXELLAYOUT(format)) {
case SDL_PACKEDLAYOUT_332:
masks[0] = 0x00000000;
masks[1] = 0x000000E0;
masks[2] = 0x0000001C;
masks[3] = 0x00000003;
break;
case SDL_PACKEDLAYOUT_4444:
masks[0] = 0x0000F000;
masks[1] = 0x00000F00;
masks[2] = 0x000000F0;
masks[3] = 0x0000000F;
break;
case SDL_PACKEDLAYOUT_1555:
masks[0] = 0x00008000;
masks[1] = 0x00007C00;
masks[2] = 0x000003E0;
masks[3] = 0x0000001F;
break;
case SDL_PACKEDLAYOUT_5551:
masks[0] = 0x0000F800;
masks[1] = 0x000007C0;
masks[2] = 0x0000003E;
masks[3] = 0x00000001;
break;
case SDL_PACKEDLAYOUT_565:
masks[0] = 0x00000000;
masks[1] = 0x0000F800;
masks[2] = 0x000007E0;
masks[3] = 0x0000001F;
break;
case SDL_PACKEDLAYOUT_8888:
masks[0] = 0xFF000000;
masks[1] = 0x00FF0000;
masks[2] = 0x0000FF00;
masks[3] = 0x000000FF;
break;
case SDL_PACKEDLAYOUT_2101010:
masks[0] = 0xC0000000;
masks[1] = 0x3FF00000;
masks[2] = 0x000FFC00;
masks[3] = 0x000003FF;
break;
case SDL_PACKEDLAYOUT_1010102:
masks[0] = 0xFFC00000;
masks[1] = 0x003FF000;
masks[2] = 0x00000FFC;
masks[3] = 0x00000003;
break;
default:
SDL_SetError("Unknown pixel format");
return SDL_FALSE;
}
switch (SDL_PIXELORDER(format)) {
case SDL_PACKEDORDER_XRGB:
*Rmask = masks[1];
*Gmask = masks[2];
*Bmask = masks[3];
break;
case SDL_PACKEDORDER_RGBX:
*Rmask = masks[0];
*Gmask = masks[1];
*Bmask = masks[2];
break;
case SDL_PACKEDORDER_ARGB:
*Amask = masks[0];
*Rmask = masks[1];
*Gmask = masks[2];
*Bmask = masks[3];
break;
case SDL_PACKEDORDER_RGBA:
*Rmask = masks[0];
*Gmask = masks[1];
*Bmask = masks[2];
*Amask = masks[3];
break;
case SDL_PACKEDORDER_XBGR:
*Bmask = masks[1];
*Gmask = masks[2];
*Rmask = masks[3];
break;
case SDL_PACKEDORDER_BGRX:
*Bmask = masks[0];
*Gmask = masks[1];
*Rmask = masks[2];
break;
case SDL_PACKEDORDER_BGRA:
*Bmask = masks[0];
*Gmask = masks[1];
*Rmask = masks[2];
*Amask = masks[3];
break;
case SDL_PACKEDORDER_ABGR:
*Amask = masks[0];
*Bmask = masks[1];
*Gmask = masks[2];
*Rmask = masks[3];
break;
default:
SDL_SetError("Unknown pixel format");
return SDL_FALSE;
}
return SDL_TRUE;
}
Uint32 SDL_MasksToPixelFormatEnum(int bpp, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
{
switch (bpp) {
case 1:
/* SDL defaults to MSB ordering */
return SDL_PIXELFORMAT_INDEX1MSB;
case 2:
/* SDL defaults to MSB ordering */
return SDL_PIXELFORMAT_INDEX2MSB;
case 4:
/* SDL defaults to MSB ordering */
return SDL_PIXELFORMAT_INDEX4MSB;
case 8:
if (Rmask == 0) {
return SDL_PIXELFORMAT_INDEX8;
}
if (Rmask == 0xE0 &&
Gmask == 0x1C &&
Bmask == 0x03 &&
Amask == 0x00) {
return SDL_PIXELFORMAT_RGB332;
}
break;
case 12:
if (Rmask == 0) {
return SDL_PIXELFORMAT_RGB444;
}
if (Rmask == 0x0F00 &&
Gmask == 0x00F0 &&
Bmask == 0x000F &&
Amask == 0x0000) {
return SDL_PIXELFORMAT_RGB444;
}
if (Rmask == 0x000F &&
Gmask == 0x00F0 &&
Bmask == 0x0F00 &&
Amask == 0x0000) {
return SDL_PIXELFORMAT_BGR444;
}
break;
case 15:
if (Rmask == 0) {
return SDL_PIXELFORMAT_RGB555;
}
SDL_FALLTHROUGH;
case 16:
if (Rmask == 0) {
return SDL_PIXELFORMAT_RGB565;
}
if (Rmask == 0x7C00 &&
Gmask == 0x03E0 &&
Bmask == 0x001F &&
Amask == 0x0000) {
return SDL_PIXELFORMAT_RGB555;
}
if (Rmask == 0x001F &&
Gmask == 0x03E0 &&
Bmask == 0x7C00 &&
Amask == 0x0000) {
return SDL_PIXELFORMAT_BGR555;
}
if (Rmask == 0x0F00 &&
Gmask == 0x00F0 &&
Bmask == 0x000F &&
Amask == 0xF000) {
return SDL_PIXELFORMAT_ARGB4444;
}
if (Rmask == 0xF000 &&
Gmask == 0x0F00 &&
Bmask == 0x00F0 &&
Amask == 0x000F) {
return SDL_PIXELFORMAT_RGBA4444;
}
if (Rmask == 0x000F &&
Gmask == 0x00F0 &&
Bmask == 0x0F00 &&
Amask == 0xF000) {
return SDL_PIXELFORMAT_ABGR4444;
}
if (Rmask == 0x00F0 &&
Gmask == 0x0F00 &&
Bmask == 0xF000 &&
Amask == 0x000F) {
return SDL_PIXELFORMAT_BGRA4444;
}
if (Rmask == 0x7C00 &&
Gmask == 0x03E0 &&
Bmask == 0x001F &&
Amask == 0x8000) {
return SDL_PIXELFORMAT_ARGB1555;
}
if (Rmask == 0xF800 &&
Gmask == 0x07C0 &&
Bmask == 0x003E &&
Amask == 0x0001) {
return SDL_PIXELFORMAT_RGBA5551;
}
if (Rmask == 0x001F &&
Gmask == 0x03E0 &&
Bmask == 0x7C00 &&
Amask == 0x8000) {
return SDL_PIXELFORMAT_ABGR1555;
}
if (Rmask == 0x003E &&
Gmask == 0x07C0 &&
Bmask == 0xF800 &&
Amask == 0x0001) {
return SDL_PIXELFORMAT_BGRA5551;
}
if (Rmask == 0xF800 &&
Gmask == 0x07E0 &&
Bmask == 0x001F &&
Amask == 0x0000) {
return SDL_PIXELFORMAT_RGB565;
}
if (Rmask == 0x001F &&
Gmask == 0x07E0 &&
Bmask == 0xF800 &&
Amask == 0x0000) {
return SDL_PIXELFORMAT_BGR565;
}
if (Rmask == 0x003F &&
Gmask == 0x07C0 &&
Bmask == 0xF800 &&
Amask == 0x0000) {
/* Technically this would be BGR556, but Witek says this works in bug 3158 */
return SDL_PIXELFORMAT_RGB565;
}
break;
case 24:
switch (Rmask) {
case 0:
case 0x00FF0000:
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
return SDL_PIXELFORMAT_RGB24;
#else
return SDL_PIXELFORMAT_BGR24;
#endif
case 0x000000FF:
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
return SDL_PIXELFORMAT_BGR24;
#else
return SDL_PIXELFORMAT_RGB24;
#endif
}
break;
case 32:
if (Rmask == 0) {
return SDL_PIXELFORMAT_RGB888;
}
if (Rmask == 0x00FF0000 &&
Gmask == 0x0000FF00 &&
Bmask == 0x000000FF &&
Amask == 0x00000000) {
return SDL_PIXELFORMAT_RGB888;
}
if (Rmask == 0xFF000000 &&
Gmask == 0x00FF0000 &&
Bmask == 0x0000FF00 &&
Amask == 0x00000000) {
return SDL_PIXELFORMAT_RGBX8888;
}
if (Rmask == 0x000000FF &&
Gmask == 0x0000FF00 &&
Bmask == 0x00FF0000 &&
Amask == 0x00000000) {
return SDL_PIXELFORMAT_BGR888;
}
if (Rmask == 0x0000FF00 &&
Gmask == 0x00FF0000 &&
Bmask == 0xFF000000 &&
Amask == 0x00000000) {
return SDL_PIXELFORMAT_BGRX8888;
}
if (Rmask == 0x00FF0000 &&
Gmask == 0x0000FF00 &&
Bmask == 0x000000FF &&
Amask == 0xFF000000) {
return SDL_PIXELFORMAT_ARGB8888;
}
if (Rmask == 0xFF000000 &&
Gmask == 0x00FF0000 &&
Bmask == 0x0000FF00 &&
Amask == 0x000000FF) {
return SDL_PIXELFORMAT_RGBA8888;
}
if (Rmask == 0x000000FF &&
Gmask == 0x0000FF00 &&
Bmask == 0x00FF0000 &&
Amask == 0xFF000000) {
return SDL_PIXELFORMAT_ABGR8888;
}
if (Rmask == 0x0000FF00 &&
Gmask == 0x00FF0000 &&
Bmask == 0xFF000000 &&
Amask == 0x000000FF) {
return SDL_PIXELFORMAT_BGRA8888;
}
if (Rmask == 0x3FF00000 &&
Gmask == 0x000FFC00 &&
Bmask == 0x000003FF &&
Amask == 0xC0000000) {
return SDL_PIXELFORMAT_ARGB2101010;
}
}
return SDL_PIXELFORMAT_UNKNOWN;
}
static SDL_PixelFormat *formats;
static SDL_SpinLock formats_lock = 0;
SDL_PixelFormat *SDL_AllocFormat(Uint32 pixel_format)
{
SDL_PixelFormat *format;
SDL_AtomicLock(&formats_lock);
/* Look it up in our list of previously allocated formats */
for (format = formats; format; format = format->next) {
if (pixel_format == format->format) {
++format->refcount;
SDL_AtomicUnlock(&formats_lock);
return format;
}
}
/* Allocate an empty pixel format structure, and initialize it */
format = SDL_malloc(sizeof(*format));
if (!format) {
SDL_AtomicUnlock(&formats_lock);
SDL_OutOfMemory();
return NULL;
}
if (SDL_InitFormat(format, pixel_format) < 0) {
SDL_AtomicUnlock(&formats_lock);
SDL_free(format);
return NULL;
}
if (!SDL_ISPIXELFORMAT_INDEXED(pixel_format)) {
/* Cache the RGB formats */
format->next = formats;
formats = format;
}
SDL_AtomicUnlock(&formats_lock);
return format;
}
int SDL_InitFormat(SDL_PixelFormat *format, Uint32 pixel_format)
{
int bpp;
Uint32 Rmask, Gmask, Bmask, Amask;
Uint32 mask;
if (!SDL_PixelFormatEnumToMasks(pixel_format, &bpp,
&Rmask, &Gmask, &Bmask, &Amask)) {
return -1;
}
/* Set up the format */
SDL_zerop(format);
format->format = pixel_format;
format->BitsPerPixel = bpp;
format->BytesPerPixel = (bpp + 7) / 8;
format->Rmask = Rmask;
format->Rshift = 0;
format->Rloss = 8;
if (Rmask) {
for (mask = Rmask; !(mask & 0x01); mask >>= 1) {
++format->Rshift;
}
for (; (mask & 0x01); mask >>= 1) {
--format->Rloss;
}
}
format->Gmask = Gmask;
format->Gshift = 0;
format->Gloss = 8;
if (Gmask) {
for (mask = Gmask; !(mask & 0x01); mask >>= 1) {
++format->Gshift;
}
for (; (mask & 0x01); mask >>= 1) {
--format->Gloss;
}
}
format->Bmask = Bmask;
format->Bshift = 0;
format->Bloss = 8;
if (Bmask) {
for (mask = Bmask; !(mask & 0x01); mask >>= 1) {
++format->Bshift;
}
for (; (mask & 0x01); mask >>= 1) {
--format->Bloss;
}
}
format->Amask = Amask;
format->Ashift = 0;
format->Aloss = 8;
if (Amask) {
for (mask = Amask; !(mask & 0x01); mask >>= 1) {
++format->Ashift;
}
for (; (mask & 0x01); mask >>= 1) {
--format->Aloss;
}
}
format->palette = NULL;
format->refcount = 1;
format->next = NULL;
return 0;
}
void SDL_FreeFormat(SDL_PixelFormat *format)
{
SDL_PixelFormat *prev;
if (!format) {
SDL_InvalidParamError("format");
return;
}
SDL_AtomicLock(&formats_lock);
if (--format->refcount > 0) {
SDL_AtomicUnlock(&formats_lock);
return;
}
/* Remove this format from our list */
if (format == formats) {
formats = format->next;
} else if (formats) {
for (prev = formats; prev->next; prev = prev->next) {
if (prev->next == format) {
prev->next = format->next;
break;
}
}
}
SDL_AtomicUnlock(&formats_lock);
if (format->palette) {
SDL_FreePalette(format->palette);
}
SDL_free(format);
}
SDL_Palette *SDL_AllocPalette(int ncolors)
{
SDL_Palette *palette;
/* Input validation */
if (ncolors < 1) {
SDL_InvalidParamError("ncolors");
return NULL;
}
palette = (SDL_Palette *)SDL_malloc(sizeof(*palette));
if (!palette) {
SDL_OutOfMemory();
return NULL;
}
palette->colors =
(SDL_Color *)SDL_malloc(ncolors * sizeof(*palette->colors));
if (!palette->colors) {
SDL_free(palette);
SDL_OutOfMemory();
return NULL;
}
palette->ncolors = ncolors;
palette->version = 1;
palette->refcount = 1;
SDL_memset(palette->colors, 0xFF, ncolors * sizeof(*palette->colors));
return palette;
}
int SDL_SetPixelFormatPalette(SDL_PixelFormat *format, SDL_Palette *palette)
{
if (!format) {
return SDL_InvalidParamError("SDL_SetPixelFormatPalette(): format");
}
if (palette && palette->ncolors > (1 << format->BitsPerPixel)) {
return SDL_SetError("SDL_SetPixelFormatPalette() passed a palette that doesn't match the format");
}
if (format->palette == palette) {
return 0;
}
if (format->palette) {
SDL_FreePalette(format->palette);
}
format->palette = palette;
if (format->palette) {
++format->palette->refcount;
}
return 0;
}
int SDL_SetPaletteColors(SDL_Palette *palette, const SDL_Color *colors,
int firstcolor, int ncolors)
{
int status = 0;
/* Verify the parameters */
if (!palette) {
return -1;
}
if (ncolors > (palette->ncolors - firstcolor)) {
ncolors = (palette->ncolors - firstcolor);
status = -1;
}
if (colors != (palette->colors + firstcolor)) {
SDL_memcpy(palette->colors + firstcolor, colors,
ncolors * sizeof(*colors));
}
++palette->version;
if (!palette->version) {
palette->version = 1;
}
return status;
}
void SDL_FreePalette(SDL_Palette *palette)
{
if (!palette) {
SDL_InvalidParamError("palette");
return;
}
if (--palette->refcount > 0) {
return;
}
SDL_free(palette->colors);
SDL_free(palette);
}
/*
* Calculate an 8-bit (3 red, 3 green, 2 blue) dithered palette of colors
*/
void SDL_DitherColors(SDL_Color *colors, int bpp)
{
int i;
if (bpp != 8) {
return; /* only 8bpp supported right now */
}
for (i = 0; i < 256; i++) {
int r, g, b;
/* map each bit field to the full [0, 255] interval,
so 0 is mapped to (0, 0, 0) and 255 to (255, 255, 255) */
r = i & 0xe0;
r |= r >> 3 | r >> 6;
colors[i].r = r;
g = (i << 3) & 0xe0;
g |= g >> 3 | g >> 6;
colors[i].g = g;
b = i & 0x3;
b |= b << 2;
b |= b << 4;
colors[i].b = b;
colors[i].a = SDL_ALPHA_OPAQUE;
}
}
/*
* Match an RGB value to a particular palette index
*/
Uint8 SDL_FindColor(SDL_Palette *pal, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
/* Do colorspace distance matching */
unsigned int smallest;
unsigned int distance;
int rd, gd, bd, ad;
int i;
Uint8 pixel = 0;
smallest = ~0;
for (i = 0; i < pal->ncolors; ++i) {
rd = pal->colors[i].r - r;
gd = pal->colors[i].g - g;
bd = pal->colors[i].b - b;
ad = pal->colors[i].a - a;
distance = (rd * rd) + (gd * gd) + (bd * bd) + (ad * ad);
if (distance < smallest) {
pixel = i;
if (distance == 0) { /* Perfect match! */
break;
}
smallest = distance;
}
}
return pixel;
}
/* Tell whether palette is opaque, and if it has an alpha_channel */
void SDL_DetectPalette(SDL_Palette *pal, SDL_bool *is_opaque, SDL_bool *has_alpha_channel)
{
int i;
{
SDL_bool all_opaque = SDL_TRUE;
for (i = 0; i < pal->ncolors; i++) {
Uint8 alpha_value = pal->colors[i].a;
if (alpha_value != SDL_ALPHA_OPAQUE) {
all_opaque = SDL_FALSE;
break;
}
}
if (all_opaque) {
/* Palette is opaque, with an alpha channel */
*is_opaque = SDL_TRUE;
*has_alpha_channel = SDL_TRUE;
return;
}
}
{
SDL_bool all_transparent = SDL_TRUE;
for (i = 0; i < pal->ncolors; i++) {
Uint8 alpha_value = pal->colors[i].a;
if (alpha_value != SDL_ALPHA_TRANSPARENT) {
all_transparent = SDL_FALSE;
break;
}
}
if (all_transparent) {
/* Palette is opaque, without an alpha channel */
*is_opaque = SDL_TRUE;
*has_alpha_channel = SDL_FALSE;
return;
}
}
/* Palette has alpha values */
*is_opaque = SDL_FALSE;
*has_alpha_channel = SDL_TRUE;
}
/* Find the opaque pixel value corresponding to an RGB triple */
Uint32 SDL_MapRGB(const SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b)
{
if (!format) {
SDL_InvalidParamError("format");
return 0;
}
if (!format->palette) {
return (r >> format->Rloss) << format->Rshift | (g >> format->Gloss) << format->Gshift | (b >> format->Bloss) << format->Bshift | format->Amask;
} else {
return SDL_FindColor(format->palette, r, g, b, SDL_ALPHA_OPAQUE);
}
}
/* Find the pixel value corresponding to an RGBA quadruple */
Uint32 SDL_MapRGBA(const SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
if (!format) {
SDL_InvalidParamError("format");
return 0;
}
if (!format->palette) {
return (r >> format->Rloss) << format->Rshift | (g >> format->Gloss) << format->Gshift | (b >> format->Bloss) << format->Bshift | ((Uint32)(a >> format->Aloss) << format->Ashift & format->Amask);
} else {
return SDL_FindColor(format->palette, r, g, b, a);
}
}
void SDL_GetRGB(Uint32 pixel, const SDL_PixelFormat *format, Uint8 *r, Uint8 *g,
Uint8 *b)
{
if (!format->palette) {
unsigned v;
v = (pixel & format->Rmask) >> format->Rshift;
*r = SDL_expand_byte[format->Rloss][v];
v = (pixel & format->Gmask) >> format->Gshift;
*g = SDL_expand_byte[format->Gloss][v];
v = (pixel & format->Bmask) >> format->Bshift;
*b = SDL_expand_byte[format->Bloss][v];
} else {
if (pixel < (unsigned)format->palette->ncolors) {
*r = format->palette->colors[pixel].r;
*g = format->palette->colors[pixel].g;
*b = format->palette->colors[pixel].b;
} else {
*r = *g = *b = 0;
}
}
}
void SDL_GetRGBA(Uint32 pixel, const SDL_PixelFormat *format,
Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a)
{
if (!format->palette) {
unsigned v;
v = (pixel & format->Rmask) >> format->Rshift;
*r = SDL_expand_byte[format->Rloss][v];
v = (pixel & format->Gmask) >> format->Gshift;
*g = SDL_expand_byte[format->Gloss][v];
v = (pixel & format->Bmask) >> format->Bshift;
*b = SDL_expand_byte[format->Bloss][v];
v = (pixel & format->Amask) >> format->Ashift;
*a = SDL_expand_byte[format->Aloss][v];
} else {
if (pixel < (unsigned)format->palette->ncolors) {
*r = format->palette->colors[pixel].r;
*g = format->palette->colors[pixel].g;
*b = format->palette->colors[pixel].b;
*a = format->palette->colors[pixel].a;
} else {
*r = *g = *b = *a = 0;
}
}
}
/* Map from Palette to Palette */
static Uint8 *Map1to1(SDL_Palette *src, SDL_Palette *dst, int *identical)
{
Uint8 *map;
int i;
if (identical) {
if (src->ncolors <= dst->ncolors) {
/* If an identical palette, no need to map */
if (src == dst ||
(SDL_memcmp(src->colors, dst->colors,
src->ncolors * sizeof(SDL_Color)) == 0)) {
*identical = 1;
return NULL;
}
}
*identical = 0;
}
map = (Uint8 *)SDL_calloc(256, sizeof(Uint8));
if (!map) {
SDL_OutOfMemory();
return NULL;
}
for (i = 0; i < src->ncolors; ++i) {
map[i] = SDL_FindColor(dst,
src->colors[i].r, src->colors[i].g,
src->colors[i].b, src->colors[i].a);
}
return map;
}
/* Map from Palette to BitField */
static Uint8 *Map1toN(SDL_PixelFormat *src, Uint8 Rmod, Uint8 Gmod, Uint8 Bmod, Uint8 Amod,
SDL_PixelFormat *dst)
{
Uint8 *map;
int i;
int bpp;
SDL_Palette *pal = src->palette;
bpp = ((dst->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel);
map = (Uint8 *)SDL_calloc(256, bpp);
if (!map) {
SDL_OutOfMemory();
return NULL;
}
/* We memory copy to the pixel map so the endianness is preserved */
for (i = 0; i < pal->ncolors; ++i) {
Uint8 R = (Uint8)((pal->colors[i].r * Rmod) / 255);
Uint8 G = (Uint8)((pal->colors[i].g * Gmod) / 255);
Uint8 B = (Uint8)((pal->colors[i].b * Bmod) / 255);
Uint8 A = (Uint8)((pal->colors[i].a * Amod) / 255);
ASSEMBLE_RGBA(&map[i * bpp], dst->BytesPerPixel, dst, (Uint32)R, (Uint32)G, (Uint32)B, (Uint32)A);
}
return map;
}
/* Map from BitField to Dithered-Palette to Palette */
static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_PixelFormat *dst, int *identical)
{
/* Generate a 256 color dither palette */
SDL_Palette dithered;
SDL_Color colors[256];
SDL_Palette *pal = dst->palette;
dithered.ncolors = 256;
SDL_DitherColors(colors, 8);
dithered.colors = colors;