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
|
/*
Simple DirectMedia Layer
Copyright (C) 1997-2025 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"
#ifndef SDL_blit_h_
#define SDL_blit_h_
// Table to do pixel byte expansion
extern const Uint8 *SDL_expand_byte[9];
extern const Uint16 SDL_expand_byte_10[];
// SDL blit copy flags
#define SDL_COPY_MODULATE_COLOR 0x00000001
#define SDL_COPY_MODULATE_ALPHA 0x00000002
#define SDL_COPY_MODULATE_MASK (SDL_COPY_MODULATE_COLOR | SDL_COPY_MODULATE_ALPHA)
#define SDL_COPY_BLEND 0x00000010
#define SDL_COPY_BLEND_PREMULTIPLIED 0x00000020
#define SDL_COPY_ADD 0x00000040
#define SDL_COPY_ADD_PREMULTIPLIED 0x00000080
#define SDL_COPY_MOD 0x00000100
#define SDL_COPY_MUL 0x00000200
#define SDL_COPY_BLEND_MASK (SDL_COPY_BLEND | SDL_COPY_BLEND_PREMULTIPLIED | SDL_COPY_ADD | SDL_COPY_ADD_PREMULTIPLIED | SDL_COPY_MOD | SDL_COPY_MUL)
#define SDL_COPY_COLORKEY 0x00000400
#define SDL_COPY_NEAREST 0x00000800
#define SDL_COPY_RLE_DESIRED 0x00001000
#define SDL_COPY_RLE_COLORKEY 0x00002000
#define SDL_COPY_RLE_ALPHAKEY 0x00004000
#define SDL_COPY_RLE_MASK (SDL_COPY_RLE_DESIRED | SDL_COPY_RLE_COLORKEY | SDL_COPY_RLE_ALPHAKEY)
// SDL blit CPU flags
#define SDL_CPU_ANY 0x00000000
#define SDL_CPU_MMX 0x00000001
#define SDL_CPU_SSE 0x00000002
#define SDL_CPU_SSE2 0x00000004
#define SDL_CPU_ALTIVEC_PREFETCH 0x00000008
#define SDL_CPU_ALTIVEC_NOPREFETCH 0x00000010
typedef struct
{
SDL_Surface *src_surface;
Uint8 *src;
int src_w, src_h;
int src_pitch;
int src_skip;
SDL_Surface *dst_surface;
Uint8 *dst;
int dst_w, dst_h;
int dst_pitch;
int dst_skip;
const SDL_PixelFormatDetails *src_fmt;
const SDL_Palette *src_pal;
const SDL_PixelFormatDetails *dst_fmt;
const SDL_Palette *dst_pal;
Uint8 *table;
SDL_HashTable *palette_map;
int flags;
Uint32 colorkey;
Uint8 r, g, b, a;
} SDL_BlitInfo;
typedef void (*SDL_BlitFunc)(SDL_BlitInfo *info);
typedef struct
{
SDL_PixelFormat src_format;
SDL_PixelFormat dst_format;
int flags;
unsigned int cpu;
SDL_BlitFunc func;
} SDL_BlitFuncEntry;
typedef bool (SDLCALL *SDL_Blit) (struct SDL_Surface *src, const SDL_Rect *srcrect, struct SDL_Surface *dst, const SDL_Rect *dstrect);
// Blit mapping definition
typedef struct SDL_BlitMap
{
int identity;
SDL_Blit blit;
void *data;
SDL_BlitInfo info;
/* the version count matches the destination; mismatch indicates
an invalid mapping */
Uint32 dst_palette_version;
Uint32 src_palette_version;
} SDL_BlitMap;
// Functions found in SDL_blit.c
extern bool SDL_CalculateBlit(SDL_Surface *surface, SDL_Surface *dst);
/* Functions found in SDL_blit_*.c */
extern SDL_BlitFunc SDL_CalculateBlit0(SDL_Surface *surface);
extern SDL_BlitFunc SDL_CalculateBlit1(SDL_Surface *surface);
extern SDL_BlitFunc SDL_CalculateBlitN(SDL_Surface *surface);
extern SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface *surface);
/*
* Useful macros for blitting routines
*/
#ifdef __GNUC__
#define DECLARE_ALIGNED(t, v, a) t __attribute__((aligned(a))) v
#elif defined(_MSC_VER)
#define DECLARE_ALIGNED(t, v, a) __declspec(align(a)) t v
#else
#define DECLARE_ALIGNED(t, v, a) t v
#endif
// Load pixel of the specified format from a buffer and get its R-G-B values
#define RGB_FROM_PIXEL(Pixel, fmt, r, g, b) \
{ \
r = SDL_expand_byte[fmt->Rbits][((Pixel & fmt->Rmask) >> fmt->Rshift)]; \
g = SDL_expand_byte[fmt->Gbits][((Pixel & fmt->Gmask) >> fmt->Gshift)]; \
b = SDL_expand_byte[fmt->Bbits][((Pixel & fmt->Bmask) >> fmt->Bshift)]; \
}
#define RGB_FROM_RGB565(Pixel, r, g, b) \
{ \
r = SDL_expand_byte[5][((Pixel & 0xF800) >> 11)]; \
g = SDL_expand_byte[6][((Pixel & 0x07E0) >> 5)]; \
b = SDL_expand_byte[5][(Pixel & 0x001F)]; \
}
#define RGB_FROM_RGB555(Pixel, r, g, b) \
{ \
r = SDL_expand_byte[5][((Pixel & 0x7C00) >> 10)]; \
g = SDL_expand_byte[5][((Pixel & 0x03E0) >> 5)]; \
b = SDL_expand_byte[5][(Pixel & 0x001F)]; \
}
#define RGB_FROM_XRGB8888(Pixel, r, g, b) \
{ \
r = ((Pixel & 0xFF0000) >> 16); \
g = ((Pixel & 0xFF00) >> 8); \
b = (Pixel & 0xFF); \
}
#define RETRIEVE_RGB_PIXEL(buf, bpp, Pixel) \
do { \
switch (bpp) { \
case 1: \
Pixel = *((Uint8 *)(buf)); \
break; \
\
case 2: \
Pixel = *((Uint16 *)(buf)); \
break; \
\
case 3: \
{ \
Uint8 *B = (Uint8 *)(buf); \
if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \
} else { \
Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \
} \
} break; \
\
case 4: \
Pixel = *((Uint32 *)(buf)); \
break; \
\
default: \
Pixel = 0; /* stop gcc complaints */ \
break; \
} \
} while (0)
#define DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b) \
do { \
switch (bpp) { \
case 1: \
Pixel = *((Uint8 *)(buf)); \
RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \
break; \
\
case 2: \
Pixel = *((Uint16 *)(buf)); \
RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \
break; \
\
case 3: \
{ \
Pixel = 0; \
if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
r = *((buf) + fmt->Rshift / 8); \
g = *((buf) + fmt->Gshift / 8); \
b = *((buf) + fmt->Bshift / 8); \
} else { \
r = *((buf) + 2 - fmt->Rshift / 8); \
g = *((buf) + 2 - fmt->Gshift / 8); \
b = *((buf) + 2 - fmt->Bshift / 8); \
} \
} break; \
\
case 4: \
Pixel = *((Uint32 *)(buf)); \
RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \
break; \
\
default: \
/* stop gcc complaints */ \
Pixel = 0; \
r = g = b = 0; \
break; \
} \
} while (0)
// Assemble R-G-B values into a specified pixel format and store them
#define PIXEL_FROM_RGB(Pixel, fmt, r, g, b) \
{ \
Pixel = ((r >> (8 - fmt->Rbits)) << fmt->Rshift) | \
((g >> (8 - fmt->Gbits)) << fmt->Gshift) | \
((b >> (8 - fmt->Bbits)) << fmt->Bshift) | \
fmt->Amask; \
}
#define RGB332_FROM_RGB(Pixel, r, g, b) \
{ \
Pixel = (Uint8)(((r >> 5) << 5) | ((g >> 5) << 2) | (b >> 6)); \
}
#define RGB565_FROM_RGB(Pixel, r, g, b) \
{ \
Pixel = (Uint16)(((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3)); \
}
#define RGB555_FROM_RGB(Pixel, r, g, b) \
{ \
Pixel = (Uint16)(((r >> 3) << 10) | ((g >> 3) << 5) | (b >> 3)); \
}
#define XRGB8888_FROM_RGB(Pixel, r, g, b) \
{ \
Pixel = (r << 16) | (g << 8) | b; \
}
#define ARGB8888_FROM_RGBA(Pixel, r, g, b, a) \
{ \
Pixel = (a << 24) | (r << 16) | (g << 8) | b; \
}
#define RGBA8888_FROM_RGBA(Pixel, r, g, b, a) \
{ \
Pixel = (r << 24) | (g << 16) | (b << 8) | a; \
}
#define ABGR8888_FROM_RGBA(Pixel, r, g, b, a) \
{ \
Pixel = (a << 24) | (b << 16) | (g << 8) | r; \
}
#define BGRA8888_FROM_RGBA(Pixel, r, g, b, a) \
{ \
Pixel = (b << 24) | (g << 16) | (r << 8) | a; \
}
#define ARGB2101010_FROM_RGBA(Pixel, r, g, b, a) \
{ \
r = r ? ((r << 2) | 0x3) : 0; \
g = g ? ((g << 2) | 0x3) : 0; \
b = b ? ((b << 2) | 0x3) : 0; \
a = (a * 3) / 255; \
Pixel = (a << 30) | (r << 20) | (g << 10) | b; \
}
#define ARGB2101010_FROM_RGBAFLOAT(Pixel, r, g, b, a) \
{ \
r = SDL_clamp(r, 0.0f, 1.0f) * 1023.0f; \
g = SDL_clamp(g, 0.0f, 1.0f) * 1023.0f; \
b = SDL_clamp(b, 0.0f, 1.0f) * 1023.0f; \
a = SDL_clamp(a, 0.0f, 1.0f) * 3.0f; \
Pixel = (((Uint32)SDL_roundf(a)) << 30) | \
(((Uint32)SDL_roundf(r)) << 20) | \
(((Uint32)SDL_roundf(g)) << 10) | \
(Uint32)SDL_roundf(b); \
}
#define ABGR2101010_FROM_RGBA(Pixel, r, g, b, a) \
{ \
r = r ? ((r << 2) | 0x3) : 0; \
g = g ? ((g << 2) | 0x3) : 0; \
b = b ? ((b << 2) | 0x3) : 0; \
a = (a * 3) / 255; \
Pixel = (a << 30) | (b << 20) | (g << 10) | r; \
}
#define ABGR2101010_FROM_RGBAFLOAT(Pixel, r, g, b, a) \
{ \
r = SDL_clamp(r, 0.0f, 1.0f) * 1023.0f; \
g = SDL_clamp(g, 0.0f, 1.0f) * 1023.0f; \
b = SDL_clamp(b, 0.0f, 1.0f) * 1023.0f; \
a = SDL_clamp(a, 0.0f, 1.0f) * 3.0f; \
Pixel = (((Uint32)SDL_roundf(a)) << 30) | \
(((Uint32)SDL_roundf(b)) << 20) | \
(((Uint32)SDL_roundf(g)) << 10) | \
(Uint32)SDL_roundf(r); \
}
#define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \
{ \
switch (bpp) { \
case 1: \
{ \
Uint8 _pixel; \
\
PIXEL_FROM_RGB(_pixel, fmt, r, g, b); \
*((Uint8 *)(buf)) = _pixel; \
} break; \
\
case 2: \
{ \
Uint16 _pixel; \
\
PIXEL_FROM_RGB(_pixel, fmt, r, g, b); \
*((Uint16 *)(buf)) = _pixel; \
} break; \
\
case 3: \
{ \
if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
*((buf) + fmt->Rshift / 8) = r; \
*((buf) + fmt->Gshift / 8) = g; \
*((buf) + fmt->Bshift / 8) = b; \
} else { \
*((buf) + 2 - fmt->Rshift / 8) = r; \
*((buf) + 2 - fmt->Gshift / 8) = g; \
*((buf) + 2 - fmt->Bshift / 8) = b; \
} \
} break; \
\
case 4: \
{ \
Uint32 _pixel; \
\
PIXEL_FROM_RGB(_pixel, fmt, r, g, b); \
*((Uint32 *)(buf)) = _pixel; \
} break; \
} \
}
// FIXME: Should we rescale alpha into 0..255 here?
#define RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a) \
{ \
r = SDL_expand_byte[fmt->Rbits][((Pixel & fmt->Rmask) >> fmt->Rshift)]; \
g = SDL_expand_byte[fmt->Gbits][((Pixel & fmt->Gmask) >> fmt->Gshift)]; \
b = SDL_expand_byte[fmt->Bbits][((Pixel & fmt->Bmask) >> fmt->Bshift)]; \
a = SDL_expand_byte[fmt->Abits][((Pixel & fmt->Amask) >> fmt->Ashift)]; \
}
#define RGBA_FROM_8888(Pixel, fmt, r, g, b, a) \
{ \
r = (Pixel & fmt->Rmask) >> fmt->Rshift; \
g = (Pixel & fmt->Gmask) >> fmt->Gshift; \
b = (Pixel & fmt->Bmask) >> fmt->Bshift; \
a = (Pixel & fmt->Amask) >> fmt->Ashift; \
}
#define RGBA_FROM_RGBA8888(Pixel, r, g, b, a) \
{ \
r = (Pixel >> 24); \
g = ((Pixel >> 16) & 0xFF); \
b = ((Pixel >> 8) & 0xFF); \
a = (Pixel & 0xFF); \
}
#define RGBA_FROM_ARGB8888(Pixel, r, g, b, a) \
{ \
r = ((Pixel >> 16) & 0xFF); \
g = ((Pixel >> 8) & 0xFF); \
b = (Pixel & 0xFF); \
a = (Pixel >> 24); \
}
#define RGBA_FROM_ABGR8888(Pixel, r, g, b, a) \
{ \
r = (Pixel & 0xFF); \
g = ((Pixel >> 8) & 0xFF); \
b = ((Pixel >> 16) & 0xFF); \
a = (Pixel >> 24); \
}
#define RGBA_FROM_BGRA8888(Pixel, r, g, b, a) \
{ \
r = ((Pixel >> 8) & 0xFF); \
g = ((Pixel >> 16) & 0xFF); \
b = (Pixel >> 24); \
a = (Pixel & 0xFF); \
}
#define RGBA_FROM_ARGB2101010(Pixel, r, g, b, a) \
{ \
r = ((Pixel >> 22) & 0xFF); \
g = ((Pixel >> 12) & 0xFF); \
b = ((Pixel >> 2) & 0xFF); \
a = SDL_expand_byte[2][(Pixel >> 30)]; \
}
#define RGBAFLOAT_FROM_ARGB2101010(Pixel, r, g, b, a) \
{ \
r = (float)((Pixel >> 20) & 0x3FF) / 1023.0f; \
g = (float)((Pixel >> 10) & 0x3FF) / 1023.0f; \
b = (float)((Pixel >> 0) & 0x3FF) / 1023.0f; \
a = (float)(Pixel >> 30) / 3.0f; \
}
#define RGBA_FROM_ABGR2101010(Pixel, r, g, b, a) \
{ \
r = ((Pixel >> 2) & 0xFF); \
g = ((Pixel >> 12) & 0xFF); \
b = ((Pixel >> 22) & 0xFF); \
a = SDL_expand_byte[2][(Pixel >> 30)]; \
}
#define RGBAFLOAT_FROM_ABGR2101010(Pixel, r, g, b, a) \
{ \
r = (float)((Pixel >> 0) & 0x3FF) / 1023.0f; \
g = (float)((Pixel >> 10) & 0x3FF) / 1023.0f; \
b = (float)((Pixel >> 20) & 0x3FF) / 1023.0f; \
a = (float)(Pixel >> 30) / 3.0f; \
}
#define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a) \
do { \
switch (bpp) { \
case 1: \
Pixel = *((Uint8 *)(buf)); \
RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \
break; \
\
case 2: \
Pixel = *((Uint16 *)(buf)); \
RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \
break; \
\
case 3: \
{ \
Pixel = 0; \
if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
r = *((buf) + fmt->Rshift / 8); \
g = *((buf) + fmt->Gshift / 8); \
b = *((buf) + fmt->Bshift / 8); \
} else { \
r = *((buf) + 2 - fmt->Rshift / 8); \
g = *((buf) + 2 - fmt->Gshift / 8); \
b = *((buf) + 2 - fmt->Bshift / 8); \
} \
a = 0xFF; \
} break; \
\
case 4: \
Pixel = *((Uint32 *)(buf)); \
RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \
break; \
\
default: \
/* stop gcc complaints */ \
Pixel = 0; \
r = g = b = a = 0; \
break; \
} \
} while (0)
// FIXME: this isn't correct, especially for Alpha (maximum != 255)
#define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a) \
{ \
Pixel = ((r >> (8 - fmt->Rbits)) << fmt->Rshift) | \
((g >> (8 - fmt->Gbits)) << fmt->Gshift) | \
((b >> (8 - fmt->Bbits)) << fmt->Bshift) | \
((a >> (8 - fmt->Abits)) << fmt->Ashift); \
}
#define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \
{ \
switch (bpp) { \
case 1: \
{ \
Uint8 _pixel; \
\
PIXEL_FROM_RGBA(_pixel, fmt, r, g, b, a); \
*((Uint8 *)(buf)) = _pixel; \
} break; \
\
case 2: \
{ \
Uint16 _pixel; \
\
PIXEL_FROM_RGBA(_pixel, fmt, r, g, b, a); \
*((Uint16 *)(buf)) = _pixel; \
} break; \
\
case 3: \
{ \
if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
*((buf) + fmt->Rshift / 8) = r; \
*((buf) + fmt->Gshift / 8) = g; \
*((buf) + fmt->Bshift / 8) = b; \
} else { \
*((buf) + 2 - fmt->Rshift / 8) = r; \
*((buf) + 2 - fmt->Gshift / 8) = g; \
*((buf) + 2 - fmt->Bshift / 8) = b; \
} \
} break; \
\
case 4: \
{ \
Uint32 _pixel; \
\
PIXEL_FROM_RGBA(_pixel, fmt, r, g, b, a); \
*((Uint32 *)(buf)) = _pixel; \
} break; \
} \
}
// Convert any 32-bit 4-bpp pixel to ARGB format
#define PIXEL_TO_ARGB_PIXEL(src, srcfmt, dst) \
do { \
Uint8 a, r, g, b; \
RGBA_FROM_PIXEL(src, srcfmt, r, g, b, a); \
dst = a << 24 | r << 16 | g << 8 | b; \
} while (0)
// Blend a single color channel or alpha value
/* dC = ((sC * sA) + (dC * (255 - sA))) / 255 */
#define ALPHA_BLEND_CHANNEL(sC, dC, sA) \
do { \
Uint16 x; \
x = ((sC - dC) * sA) + ((dC << 8) - dC); \
x += 0x1U; \
x += x >> 8; \
dC = x >> 8; \
} while (0)
// Perform a division by 255 after a multiplication of two 8-bit color channels
/* out = (sC * dC) / 255 */
#define MULT_DIV_255(sC, dC, out) \
do { \
Uint16 x = sC * dC; \
x += 0x1U; \
x += x >> 8; \
out = x >> 8; \
} while (0)
// Blend the RGB values of two pixels with an alpha value
#define ALPHA_BLEND_RGB(sR, sG, sB, A, dR, dG, dB) \
do { \
ALPHA_BLEND_CHANNEL(sR, dR, A); \
ALPHA_BLEND_CHANNEL(sG, dG, A); \
ALPHA_BLEND_CHANNEL(sB, dB, A); \
} while (0)
// Blend two 8888 pixels with the same format
/* Calculates dst = ((src * factor) + (dst * (255 - factor))) / 255 */
// FIXME: SDL_SIZE_MAX might not be an integer literal
#if defined(SIZE_MAX) && (SIZE_MAX == 0xffffffffffffffff)
#define FACTOR_BLEND_8888(src, dst, factor) \
do { \
Uint64 src64 = src; \
src64 = (src64 | (src64 << 24)) & 0x00FF00FF00FF00FF; \
\
Uint64 dst64 = dst; \
dst64 = (dst64 | (dst64 << 24)) & 0x00FF00FF00FF00FF; \
\
dst64 = ((src64 - dst64) * factor) + (dst64 << 8) - dst64; \
dst64 += 0x0001000100010001; \
dst64 += (dst64 >> 8) & 0x00FF00FF00FF00FF; \
dst64 &= 0xFF00FF00FF00FF00; \
\
dst = (Uint32)((dst64 >> 8) | (dst64 >> 32)); \
} while (0)
#else
#define FACTOR_BLEND_8888(src, dst, factor) \
do { \
Uint32 src02 = src & 0x00FF00FF; \
Uint32 dst02 = dst & 0x00FF00FF; \
\
Uint32 src13 = (src >> 8) & 0x00FF00FF; \
Uint32 dst13 = (dst >> 8) & 0x00FF00FF; \
\
Uint32 res02 = ((src02 - dst02) * factor) + (dst02 << 8) - dst02; \
res02 += 0x00010001; \
res02 += (res02 >> 8) & 0x00FF00FF; \
res02 = (res02 >> 8) & 0x00FF00FF; \
\
Uint32 res13 = ((src13 - dst13) * factor) + (dst13 << 8) - dst13; \
res13 += 0x00010001; \
res13 += (res13 >> 8) & 0x00FF00FF; \
res13 &= 0xFF00FF00; \
dst = res02 | res13; \
} while (0)
#endif
// Alpha blend two 8888 pixels with the same formats.
#define ALPHA_BLEND_8888(src, dst, fmt) \
do { \
Uint32 srcA = (src >> fmt->Ashift) & 0xFF; \
Uint32 tmp = src | fmt->Amask; \
FACTOR_BLEND_8888(tmp, dst, srcA); \
} while (0)
// Alpha blend two 8888 pixels with differing formats.
#define ALPHA_BLEND_SWIZZLE_8888(src, dst, srcfmt, dstfmt) \
do { \
Uint32 srcA = (src >> srcfmt->Ashift) & 0xFF; \
Uint32 tmp = (((src >> srcfmt->Rshift) & 0xFF) << dstfmt->Rshift) | \
(((src >> srcfmt->Gshift) & 0xFF) << dstfmt->Gshift) | \
(((src >> srcfmt->Bshift) & 0xFF) << dstfmt->Bshift) | \
dstfmt->Amask; \
FACTOR_BLEND_8888(tmp, dst, srcA); \
} while (0)
// Blend the RGBA values of two pixels
#define ALPHA_BLEND_RGBA(sR, sG, sB, sA, dR, dG, dB, dA) \
do { \
ALPHA_BLEND_CHANNEL(sR, dR, sA); \
ALPHA_BLEND_CHANNEL(sG, dG, sA); \
ALPHA_BLEND_CHANNEL(sB, dB, sA); \
ALPHA_BLEND_CHANNEL(255, dA, sA); \
} while (0)
// This is a very useful loop for optimizing blitters
#if defined(_MSC_VER) && (_MSC_VER == 1300)
// There's a bug in the Visual C++ 7 optimizer when compiling this code
#else
#define USE_DUFFS_LOOP
#endif
#define DUFFS_LOOP1(pixel_copy_increment, width) \
{ \
int n; \
for (n = width; n > 0; --n) { \
pixel_copy_increment; \
} \
}
#ifdef USE_DUFFS_LOOP
// 8-times unrolled loop
#define DUFFS_LOOP8(pixel_copy_increment, width) \
{ \
int n = (width + 7) / 8; \
switch (width & 7) { \
case 0: \
do { \
pixel_copy_increment; \
SDL_FALLTHROUGH; \
case 7: \
pixel_copy_increment; \
SDL_FALLTHROUGH; \
case 6: \
pixel_copy_increment; \
SDL_FALLTHROUGH; \
case 5: \
pixel_copy_increment; \
SDL_FALLTHROUGH; \
case 4: \
pixel_copy_increment; \
SDL_FALLTHROUGH; \
case 3: \
pixel_copy_increment; \
SDL_FALLTHROUGH; \
case 2: \
pixel_copy_increment; \
SDL_FALLTHROUGH; \
case 1: \
pixel_copy_increment; \
} while (--n > 0); \
} \
}
// 4-times unrolled loop
#define DUFFS_LOOP4(pixel_copy_increment, width) \
{ \
int n = (width + 3) / 4; \
switch (width & 3) { \
case 0: \
do { \
pixel_copy_increment; \
SDL_FALLTHROUGH; \
case 3: \
pixel_copy_increment; \
SDL_FALLTHROUGH; \
case 2: \
pixel_copy_increment; \
SDL_FALLTHROUGH; \
case 1: \
pixel_copy_increment; \
} while (--n > 0); \
} \
}
// 2-times unrolled loop
#define DUFFS_LOOP2(pixel_copy_increment, width) \
{ \
int n = (width + 1) / 2; \
switch (width & 1) { \
case 0: \
do { \
pixel_copy_increment; \
SDL_FALLTHROUGH; \
case 1: \
pixel_copy_increment; \
} while (--n > 0); \
} \
}
// Use the 4-times version of the loop by default
#define DUFFS_LOOP(pixel_copy_increment, width) \
DUFFS_LOOP4(pixel_copy_increment, width)
// Use the 8-times version of the loop for simple routines
#define DUFFS_LOOP_TRIVIAL(pixel_copy_increment, width) \
DUFFS_LOOP8(pixel_copy_increment, width)
// Special version of Duff's device for even more optimization
#define DUFFS_LOOP_124(pixel_copy_increment1, \
pixel_copy_increment2, \
pixel_copy_increment4, width) \
{ \
int n = width; \
if (n & 1) { \
pixel_copy_increment1; \
n -= 1; \
} \
if (n & 2) { \
pixel_copy_increment2; \
n -= 2; \
} \
if (n & 4) { \
pixel_copy_increment4; \
n -= 4; \
} \
if (n) { \
n /= 8; \
do { \
pixel_copy_increment4; \
pixel_copy_increment4; \
} while (--n > 0); \
} \
}
#else
// Don't use Duff's device to unroll loops
#define DUFFS_LOOP(pixel_copy_increment, width) \
DUFFS_LOOP1(pixel_copy_increment, width)
#define DUFFS_LOOP_TRIVIAL(pixel_copy_increment, width) \
DUFFS_LOOP1(pixel_copy_increment, width)
#define DUFFS_LOOP8(pixel_copy_increment, width) \
DUFFS_LOOP1(pixel_copy_increment, width)
#define DUFFS_LOOP4(pixel_copy_increment, width) \
DUFFS_LOOP1(pixel_copy_increment, width)
#define DUFFS_LOOP2(pixel_copy_increment, width) \
DUFFS_LOOP1(pixel_copy_increment, width)
#define DUFFS_LOOP_124(pixel_copy_increment1, \
pixel_copy_increment2, \
pixel_copy_increment4, width) \
DUFFS_LOOP1(pixel_copy_increment1, width)
#endif // USE_DUFFS_LOOP
#if defined(_MSC_VER) && (_MSC_VER >= 600)
#pragma warning(disable : 4244) // '=': conversion from 'X' to 'Y', possible loss of data
#endif
#endif // SDL_blit_h_
|
