SDL  2.0
SDL_blit.h
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
4 
5  This software is provided 'as-is', without any express or implied
6  warranty. In no event will the authors be held liable for any damages
7  arising from the use of this software.
8 
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12 
13  1. The origin of this software must not be misrepresented; you must not
14  claim that you wrote the original software. If you use this software
15  in a product, an acknowledgment in the product documentation would be
16  appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18  misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20 */
21 #include "../SDL_internal.h"
22 
23 #ifndef SDL_blit_h_
24 #define SDL_blit_h_
25 
26 #include "SDL_cpuinfo.h"
27 #include "SDL_endian.h"
28 #include "SDL_surface.h"
29 
30 /* Table to do pixel byte expansion */
31 extern Uint8* SDL_expand_byte[9];
32 
33 /* SDL blit copy flags */
34 #define SDL_COPY_MODULATE_COLOR 0x00000001
35 #define SDL_COPY_MODULATE_ALPHA 0x00000002
36 #define SDL_COPY_BLEND 0x00000010
37 #define SDL_COPY_ADD 0x00000020
38 #define SDL_COPY_MOD 0x00000040
39 #define SDL_COPY_COLORKEY 0x00000100
40 #define SDL_COPY_NEAREST 0x00000200
41 #define SDL_COPY_RLE_DESIRED 0x00001000
42 #define SDL_COPY_RLE_COLORKEY 0x00002000
43 #define SDL_COPY_RLE_ALPHAKEY 0x00004000
44 #define SDL_COPY_RLE_MASK (SDL_COPY_RLE_DESIRED|SDL_COPY_RLE_COLORKEY|SDL_COPY_RLE_ALPHAKEY)
45 
46 /* SDL blit CPU flags */
47 #define SDL_CPU_ANY 0x00000000
48 #define SDL_CPU_MMX 0x00000001
49 #define SDL_CPU_3DNOW 0x00000002
50 #define SDL_CPU_SSE 0x00000004
51 #define SDL_CPU_SSE2 0x00000008
52 #define SDL_CPU_ALTIVEC_PREFETCH 0x00000010
53 #define SDL_CPU_ALTIVEC_NOPREFETCH 0x00000020
54 
55 typedef struct
56 {
58  int src_w, src_h;
59  int src_pitch;
60  int src_skip;
62  int dst_w, dst_h;
63  int dst_pitch;
64  int dst_skip;
68  int flags;
70  Uint8 r, g, b, a;
71 } SDL_BlitInfo;
72 
73 typedef void (*SDL_BlitFunc) (SDL_BlitInfo *info);
74 
75 
76 typedef struct
77 {
80  int flags;
81  int cpu;
84 
85 /* Blit mapping definition */
86 typedef struct SDL_BlitMap
87 {
89  int identity;
91  void *data;
93 
94  /* the version count matches the destination; mismatch indicates
95  an invalid mapping */
98 } SDL_BlitMap;
99 
100 /* Functions found in SDL_blit.c */
102 
103 /* Functions found in SDL_blit_*.c */
108 
109 /*
110  * Useful macros for blitting routines
111  */
112 
113 #if defined(__GNUC__)
114 #define DECLARE_ALIGNED(t,v,a) t __attribute__((aligned(a))) v
115 #elif defined(_MSC_VER)
116 #define DECLARE_ALIGNED(t,v,a) __declspec(align(a)) t v
117 #else
118 #define DECLARE_ALIGNED(t,v,a) t v
119 #endif
120 
121 /* Load pixel of the specified format from a buffer and get its R-G-B values */
122 #define RGB_FROM_PIXEL(Pixel, fmt, r, g, b) \
123 { \
124  r = SDL_expand_byte[fmt->Rloss][((Pixel&fmt->Rmask)>>fmt->Rshift)]; \
125  g = SDL_expand_byte[fmt->Gloss][((Pixel&fmt->Gmask)>>fmt->Gshift)]; \
126  b = SDL_expand_byte[fmt->Bloss][((Pixel&fmt->Bmask)>>fmt->Bshift)]; \
127 }
128 #define RGB_FROM_RGB565(Pixel, r, g, b) \
129  { \
130  r = SDL_expand_byte[3][((Pixel&0xF800)>>11)]; \
131  g = SDL_expand_byte[2][((Pixel&0x07E0)>>5)]; \
132  b = SDL_expand_byte[3][(Pixel&0x001F)]; \
133 }
134 #define RGB_FROM_RGB555(Pixel, r, g, b) \
135 { \
136  r = SDL_expand_byte[3][((Pixel&0x7C00)>>10)]; \
137  g = SDL_expand_byte[3][((Pixel&0x03E0)>>5)]; \
138  b = SDL_expand_byte[3][(Pixel&0x001F)]; \
139 }
140 #define RGB_FROM_RGB888(Pixel, r, g, b) \
141 { \
142  r = ((Pixel&0xFF0000)>>16); \
143  g = ((Pixel&0xFF00)>>8); \
144  b = (Pixel&0xFF); \
145 }
146 #define RETRIEVE_RGB_PIXEL(buf, bpp, Pixel) \
147 do { \
148  switch (bpp) { \
149  case 1: \
150  Pixel = *((Uint8 *)(buf)); \
151  break; \
152  \
153  case 2: \
154  Pixel = *((Uint16 *)(buf)); \
155  break; \
156  \
157  case 3: { \
158  Uint8 *B = (Uint8 *)(buf); \
159  if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
160  Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \
161  } else { \
162  Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \
163  } \
164  } \
165  break; \
166  \
167  case 4: \
168  Pixel = *((Uint32 *)(buf)); \
169  break; \
170  \
171  default: \
172  Pixel = 0; /* stop gcc complaints */ \
173  break; \
174  } \
175 } while (0)
176 
177 #define DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b) \
178 do { \
179  switch (bpp) { \
180  case 1: \
181  Pixel = *((Uint8 *)(buf)); \
182  RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \
183  break; \
184  \
185  case 2: \
186  Pixel = *((Uint16 *)(buf)); \
187  RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \
188  break; \
189  \
190  case 3: { \
191  Pixel = 0; \
192  if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
193  r = *((buf)+fmt->Rshift/8); \
194  g = *((buf)+fmt->Gshift/8); \
195  b = *((buf)+fmt->Bshift/8); \
196  } else { \
197  r = *((buf)+2-fmt->Rshift/8); \
198  g = *((buf)+2-fmt->Gshift/8); \
199  b = *((buf)+2-fmt->Bshift/8); \
200  } \
201  } \
202  break; \
203  \
204  case 4: \
205  Pixel = *((Uint32 *)(buf)); \
206  RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \
207  break; \
208  \
209  default: \
210  /* stop gcc complaints */ \
211  Pixel = 0; \
212  r = g = b = 0; \
213  break; \
214  } \
215 } while (0)
216 
217 /* Assemble R-G-B values into a specified pixel format and store them */
218 #define PIXEL_FROM_RGB(Pixel, fmt, r, g, b) \
219 { \
220  Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \
221  ((g>>fmt->Gloss)<<fmt->Gshift)| \
222  ((b>>fmt->Bloss)<<fmt->Bshift)| \
223  fmt->Amask; \
224 }
225 #define RGB565_FROM_RGB(Pixel, r, g, b) \
226 { \
227  Pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3); \
228 }
229 #define RGB555_FROM_RGB(Pixel, r, g, b) \
230 { \
231  Pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3); \
232 }
233 #define RGB888_FROM_RGB(Pixel, r, g, b) \
234 { \
235  Pixel = (r<<16)|(g<<8)|b; \
236 }
237 #define ARGB8888_FROM_RGBA(Pixel, r, g, b, a) \
238 { \
239  Pixel = (a<<24)|(r<<16)|(g<<8)|b; \
240 }
241 #define RGBA8888_FROM_RGBA(Pixel, r, g, b, a) \
242 { \
243  Pixel = (r<<24)|(g<<16)|(b<<8)|a; \
244 }
245 #define ABGR8888_FROM_RGBA(Pixel, r, g, b, a) \
246 { \
247  Pixel = (a<<24)|(b<<16)|(g<<8)|r; \
248 }
249 #define BGRA8888_FROM_RGBA(Pixel, r, g, b, a) \
250 { \
251  Pixel = (b<<24)|(g<<16)|(r<<8)|a; \
252 }
253 #define ARGB2101010_FROM_RGBA(Pixel, r, g, b, a) \
254 { \
255  r = r ? ((r << 2) | 0x3) : 0; \
256  g = g ? ((g << 2) | 0x3) : 0; \
257  b = b ? ((b << 2) | 0x3) : 0; \
258  a = (a * 3) / 255; \
259  Pixel = (a<<30)|(r<<20)|(g<<10)|b; \
260 }
261 #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \
262 { \
263  switch (bpp) { \
264  case 1: { \
265  Uint8 Pixel; \
266  \
267  PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \
268  *((Uint8 *)(buf)) = Pixel; \
269  } \
270  break; \
271  \
272  case 2: { \
273  Uint16 Pixel; \
274  \
275  PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \
276  *((Uint16 *)(buf)) = Pixel; \
277  } \
278  break; \
279  \
280  case 3: { \
281  if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
282  *((buf)+fmt->Rshift/8) = r; \
283  *((buf)+fmt->Gshift/8) = g; \
284  *((buf)+fmt->Bshift/8) = b; \
285  } else { \
286  *((buf)+2-fmt->Rshift/8) = r; \
287  *((buf)+2-fmt->Gshift/8) = g; \
288  *((buf)+2-fmt->Bshift/8) = b; \
289  } \
290  } \
291  break; \
292  \
293  case 4: { \
294  Uint32 Pixel; \
295  \
296  PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \
297  *((Uint32 *)(buf)) = Pixel; \
298  } \
299  break; \
300  } \
301 }
302 
303 /* FIXME: Should we rescale alpha into 0..255 here? */
304 #define RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a) \
305 { \
306  r = SDL_expand_byte[fmt->Rloss][((Pixel&fmt->Rmask)>>fmt->Rshift)]; \
307  g = SDL_expand_byte[fmt->Gloss][((Pixel&fmt->Gmask)>>fmt->Gshift)]; \
308  b = SDL_expand_byte[fmt->Bloss][((Pixel&fmt->Bmask)>>fmt->Bshift)]; \
309  a = SDL_expand_byte[fmt->Aloss][((Pixel&fmt->Amask)>>fmt->Ashift)]; \
310 }
311 #define RGBA_FROM_8888(Pixel, fmt, r, g, b, a) \
312 { \
313  r = (Pixel&fmt->Rmask)>>fmt->Rshift; \
314  g = (Pixel&fmt->Gmask)>>fmt->Gshift; \
315  b = (Pixel&fmt->Bmask)>>fmt->Bshift; \
316  a = (Pixel&fmt->Amask)>>fmt->Ashift; \
317 }
318 #define RGBA_FROM_RGBA8888(Pixel, r, g, b, a) \
319 { \
320  r = (Pixel>>24); \
321  g = ((Pixel>>16)&0xFF); \
322  b = ((Pixel>>8)&0xFF); \
323  a = (Pixel&0xFF); \
324 }
325 #define RGBA_FROM_ARGB8888(Pixel, r, g, b, a) \
326 { \
327  r = ((Pixel>>16)&0xFF); \
328  g = ((Pixel>>8)&0xFF); \
329  b = (Pixel&0xFF); \
330  a = (Pixel>>24); \
331 }
332 #define RGBA_FROM_ABGR8888(Pixel, r, g, b, a) \
333 { \
334  r = (Pixel&0xFF); \
335  g = ((Pixel>>8)&0xFF); \
336  b = ((Pixel>>16)&0xFF); \
337  a = (Pixel>>24); \
338 }
339 #define RGBA_FROM_BGRA8888(Pixel, r, g, b, a) \
340 { \
341  r = ((Pixel>>8)&0xFF); \
342  g = ((Pixel>>16)&0xFF); \
343  b = (Pixel>>24); \
344  a = (Pixel&0xFF); \
345 }
346 #define RGBA_FROM_ARGB2101010(Pixel, r, g, b, a) \
347 { \
348  r = ((Pixel>>22)&0xFF); \
349  g = ((Pixel>>12)&0xFF); \
350  b = ((Pixel>>2)&0xFF); \
351  a = SDL_expand_byte[6][(Pixel>>30)]; \
352 }
353 #define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a) \
354 do { \
355  switch (bpp) { \
356  case 1: \
357  Pixel = *((Uint8 *)(buf)); \
358  RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \
359  break; \
360  \
361  case 2: \
362  Pixel = *((Uint16 *)(buf)); \
363  RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \
364  break; \
365  \
366  case 3: { \
367  Pixel = 0; \
368  if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
369  r = *((buf)+fmt->Rshift/8); \
370  g = *((buf)+fmt->Gshift/8); \
371  b = *((buf)+fmt->Bshift/8); \
372  } else { \
373  r = *((buf)+2-fmt->Rshift/8); \
374  g = *((buf)+2-fmt->Gshift/8); \
375  b = *((buf)+2-fmt->Bshift/8); \
376  } \
377  a = 0xFF; \
378  } \
379  break; \
380  \
381  case 4: \
382  Pixel = *((Uint32 *)(buf)); \
383  RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \
384  break; \
385  \
386  default: \
387  /* stop gcc complaints */ \
388  Pixel = 0; \
389  r = g = b = a = 0; \
390  break; \
391  } \
392 } while (0)
393 
394 /* FIXME: this isn't correct, especially for Alpha (maximum != 255) */
395 #define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a) \
396 { \
397  Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \
398  ((g>>fmt->Gloss)<<fmt->Gshift)| \
399  ((b>>fmt->Bloss)<<fmt->Bshift)| \
400  ((a>>fmt->Aloss)<<fmt->Ashift); \
401 }
402 #define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \
403 { \
404  switch (bpp) { \
405  case 1: { \
406  Uint8 _pixel; \
407  \
408  PIXEL_FROM_RGBA(_pixel, fmt, r, g, b, a); \
409  *((Uint8 *)(buf)) = _pixel; \
410  } \
411  break; \
412  \
413  case 2: { \
414  Uint16 _pixel; \
415  \
416  PIXEL_FROM_RGBA(_pixel, fmt, r, g, b, a); \
417  *((Uint16 *)(buf)) = _pixel; \
418  } \
419  break; \
420  \
421  case 3: { \
422  if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
423  *((buf)+fmt->Rshift/8) = r; \
424  *((buf)+fmt->Gshift/8) = g; \
425  *((buf)+fmt->Bshift/8) = b; \
426  } else { \
427  *((buf)+2-fmt->Rshift/8) = r; \
428  *((buf)+2-fmt->Gshift/8) = g; \
429  *((buf)+2-fmt->Bshift/8) = b; \
430  } \
431  } \
432  break; \
433  \
434  case 4: { \
435  Uint32 _pixel; \
436  \
437  PIXEL_FROM_RGBA(_pixel, fmt, r, g, b, a); \
438  *((Uint32 *)(buf)) = _pixel; \
439  } \
440  break; \
441  } \
442 }
443 
444 /* Blend the RGB values of two pixels with an alpha value */
445 #define ALPHA_BLEND_RGB(sR, sG, sB, A, dR, dG, dB) \
446 do { \
447  dR = (Uint8)((((int)(sR-dR)*(int)A)/255)+dR); \
448  dG = (Uint8)((((int)(sG-dG)*(int)A)/255)+dG); \
449  dB = (Uint8)((((int)(sB-dB)*(int)A)/255)+dB); \
450 } while(0)
451 
452 
453 /* Blend the RGBA values of two pixels */
454 #define ALPHA_BLEND_RGBA(sR, sG, sB, sA, dR, dG, dB, dA) \
455 do { \
456  dR = (Uint8)((((int)(sR-dR)*(int)sA)/255)+dR); \
457  dG = (Uint8)((((int)(sG-dG)*(int)sA)/255)+dG); \
458  dB = (Uint8)((((int)(sB-dB)*(int)sA)/255)+dB); \
459  dA = (Uint8)((int)sA+dA-((int)sA*dA)/255); \
460 } while(0)
461 
462 
463 /* This is a very useful loop for optimizing blitters */
464 #if defined(_MSC_VER) && (_MSC_VER == 1300)
465 /* There's a bug in the Visual C++ 7 optimizer when compiling this code */
466 #else
467 #define USE_DUFFS_LOOP
468 #endif
469 #ifdef USE_DUFFS_LOOP
470 
471 /* 8-times unrolled loop */
472 #define DUFFS_LOOP8(pixel_copy_increment, width) \
473 { int n = (width+7)/8; \
474  switch (width & 7) { \
475  case 0: do { pixel_copy_increment; /* fallthrough */ \
476  case 7: pixel_copy_increment; /* fallthrough */ \
477  case 6: pixel_copy_increment; /* fallthrough */ \
478  case 5: pixel_copy_increment; /* fallthrough */ \
479  case 4: pixel_copy_increment; /* fallthrough */ \
480  case 3: pixel_copy_increment; /* fallthrough */ \
481  case 2: pixel_copy_increment; /* fallthrough */ \
482  case 1: pixel_copy_increment; /* fallthrough */ \
483  } while ( --n > 0 ); \
484  } \
485 }
486 
487 /* 4-times unrolled loop */
488 #define DUFFS_LOOP4(pixel_copy_increment, width) \
489 { int n = (width+3)/4; \
490  switch (width & 3) { \
491  case 0: do { pixel_copy_increment; /* fallthrough */ \
492  case 3: pixel_copy_increment; /* fallthrough */ \
493  case 2: pixel_copy_increment; /* fallthrough */ \
494  case 1: pixel_copy_increment; /* fallthrough */ \
495  } while (--n > 0); \
496  } \
497 }
498 
499 /* Use the 8-times version of the loop by default */
500 #define DUFFS_LOOP(pixel_copy_increment, width) \
501  DUFFS_LOOP8(pixel_copy_increment, width)
502 
503 /* Special version of Duff's device for even more optimization */
504 #define DUFFS_LOOP_124(pixel_copy_increment1, \
505  pixel_copy_increment2, \
506  pixel_copy_increment4, width) \
507 { int n = width; \
508  if (n & 1) { \
509  pixel_copy_increment1; n -= 1; \
510  } \
511  if (n & 2) { \
512  pixel_copy_increment2; n -= 2; \
513  } \
514  if (n & 4) { \
515  pixel_copy_increment4; n -= 4; \
516  } \
517  if (n) { \
518  n /= 8; \
519  do { \
520  pixel_copy_increment4; \
521  pixel_copy_increment4; \
522  } while (--n > 0); \
523  } \
524 }
525 
526 #else
527 
528 /* Don't use Duff's device to unroll loops */
529 #define DUFFS_LOOP(pixel_copy_increment, width) \
530 { int n; \
531  for ( n=width; n > 0; --n ) { \
532  pixel_copy_increment; \
533  } \
534 }
535 #define DUFFS_LOOP8(pixel_copy_increment, width) \
536  DUFFS_LOOP(pixel_copy_increment, width)
537 #define DUFFS_LOOP4(pixel_copy_increment, width) \
538  DUFFS_LOOP(pixel_copy_increment, width)
539 #define DUFFS_LOOP_124(pixel_copy_increment1, \
540  pixel_copy_increment2, \
541  pixel_copy_increment4, width) \
542  DUFFS_LOOP(pixel_copy_increment1, width)
543 
544 #endif /* USE_DUFFS_LOOP */
545 
546 /* Prevent Visual C++ 6.0 from printing out stupid warnings */
547 #if defined(_MSC_VER) && (_MSC_VER >= 600)
548 #pragma warning(disable: 4550)
549 #endif
550 
551 #endif /* SDL_blit_h_ */
552 
553 /* vi: set ts=4 sw=4 expandtab: */
SDL_BlitFunc func
Definition: SDL_blit.h:82
Uint8 * table
Definition: SDL_blit.h:67
Uint8 r
Definition: SDL_blit.h:70
SDL_BlitFunc SDL_CalculateBlitN(SDL_Surface *surface)
Definition: SDL_blit_N.c:2537
SDL_blit blit
Definition: SDL_blit.h:90
int src_skip
Definition: SDL_blit.h:60
int(* SDL_blit)(struct SDL_Surface *src, SDL_Rect *srcrect, struct SDL_Surface *dst, SDL_Rect *dstrect)
The type of function used for surface blitting functions.
Definition: SDL_surface.h:97
SDL_PixelFormat * src_fmt
Definition: SDL_blit.h:65
EGLSurface surface
Definition: eglext.h:248
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
int SDL_CalculateBlit(SDL_Surface *surface)
Definition: SDL_blit.c:216
Uint32 src_format
Definition: SDL_blit.h:78
Uint32 dst_palette_version
Definition: SDL_blit.h:96
int dst_pitch
Definition: SDL_blit.h:63
int dst_skip
Definition: SDL_blit.h:64
uint32_t Uint32
Definition: SDL_stdinc.h:181
Uint32 colorkey
Definition: SDL_blit.h:69
Uint32 src_palette_version
Definition: SDL_blit.h:97
Uint8 * dst
Definition: SDL_blit.h:61
int cpu
Definition: SDL_blit.h:81
Uint8 * SDL_expand_byte[9]
Definition: SDL_pixels.c:71
uint8_t Uint8
Definition: SDL_stdinc.h:157
Uint8 * src
Definition: SDL_blit.h:57
Definition: SDL_blit.h:76
SDL_PixelFormat * dst_fmt
Definition: SDL_blit.h:66
int src_pitch
Definition: SDL_blit.h:59
Uint32 dst_format
Definition: SDL_blit.h:79
SDL_Surface * dst
Definition: SDL_blit.h:88
SDL_BlitFunc SDL_CalculateBlit0(SDL_Surface *surface)
Definition: SDL_blit_0.c:454
SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char const char SDL_SCANF_FORMAT_STRING const char return SDL_ThreadFunction const char void return Uint32 return Uint32 void
SDL_BlitFunc SDL_CalculateBlit1(SDL_Surface *surface)
Definition: SDL_blit_1.c:522
int flags
Definition: SDL_blit.h:80
void(* SDL_BlitFunc)(SDL_BlitInfo *info)
Definition: SDL_blit.h:73
void * data
Definition: SDL_blit.h:91
SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface *surface)
Definition: SDL_blit_A.c:1269
GLboolean GLboolean GLboolean GLboolean a
GLboolean GLboolean g
GLboolean GLboolean GLboolean b
int identity
Definition: SDL_blit.h:89
SDL_BlitInfo info
Definition: SDL_blit.h:92