/
SDL_blit.h
434 lines (402 loc) · 11.9 KB
/
SDL_blit.h
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
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@devolution.com
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif
#ifndef _SDL_blit_h
#define _SDL_blit_h
#include "SDL_endian.h"
/* The structure passed to the low level blit functions */
typedef struct {
Uint8 *s_pixels;
int s_width;
int s_height;
int s_skip;
Uint8 *d_pixels;
int d_width;
int d_height;
int d_skip;
void *aux_data;
SDL_PixelFormat *src;
Uint8 *table;
SDL_PixelFormat *dst;
} SDL_BlitInfo;
/* The type definition for the low level blit functions */
typedef void (*SDL_loblit)(SDL_BlitInfo *info);
/* This is the private info structure for software accelerated blits */
struct private_swaccel {
SDL_loblit blit;
void *aux_data;
};
/* Blit mapping definition */
typedef struct SDL_BlitMap {
SDL_Surface *dst;
int identity;
Uint8 *table;
SDL_blit hw_blit;
SDL_blit sw_blit;
struct private_hwaccel *hw_data;
struct private_swaccel *sw_data;
/* the version count matches the destination; mismatch indicates
an invalid mapping */
unsigned int format_version;
} SDL_BlitMap;
/* Functions found in SDL_blit.c */
extern int SDL_CalculateBlit(SDL_Surface *surface);
/* Functions found in SDL_blit_{0,1,N,A}.c */
extern SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int complex);
extern SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int complex);
extern SDL_loblit SDL_CalculateBlitN(SDL_Surface *surface, int complex);
extern SDL_loblit SDL_CalculateAlphaBlit(SDL_Surface *surface, int complex);
/*
* Useful macros for blitting routines
*/
#define FORMAT_EQUAL(A, B) \
((A)->BitsPerPixel == (B)->BitsPerPixel \
&& ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask))
/* Load pixel of the specified format from a buffer and get its R-G-B values */
/* FIXME: rescale values to 0..255 here? */
#define RGB_FROM_PIXEL(pixel, fmt, r, g, b) \
{ \
r = (((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); \
g = (((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); \
b = (((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); \
}
#define RGB_FROM_RGB565(pixel, r, g, b) \
{ \
r = (((pixel&0xF800)>>11)<<3); \
g = (((pixel&0x07E0)>>5)<<2); \
b = ((pixel&0x001F)<<3); \
}
#define RGB_FROM_RGB555(pixel, r, g, b) \
{ \
r = (((pixel&0x7C00)>>10)<<3); \
g = (((pixel&0x03E0)>>5)<<3); \
b = ((pixel&0x001F)<<3); \
}
#define RGB_FROM_RGB888(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 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; /* appease gcc */ \
break; \
} \
} while(0)
#define DISEMBLE_RGB(buf, bpp, fmt, pixel, r, g, b) \
do { \
switch (bpp) { \
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; /* prevent gcc from complaining */ \
break; \
} \
RGB_FROM_PIXEL(pixel, fmt, r, g, b); \
} 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>>fmt->Rloss)<<fmt->Rshift)| \
((g>>fmt->Gloss)<<fmt->Gshift)| \
((b>>fmt->Bloss)<<fmt->Bshift); \
}
#define RGB565_FROM_RGB(pixel, r, g, b) \
{ \
pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3); \
}
#define RGB555_FROM_RGB(pixel, r, g, b) \
{ \
pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3); \
}
#define RGB888_FROM_RGB(pixel, r, g, b) \
{ \
pixel = (r<<16)|(g<<8)|b; \
}
#define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \
{ \
switch (bpp) { \
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; \
} \
}
#define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask) \
{ \
switch (bpp) { \
case 2: { \
Uint16 *bufp; \
Uint16 pixel; \
\
bufp = (Uint16 *)buf; \
PIXEL_FROM_RGB(pixel, fmt, r, g, b); \
*bufp = pixel | (*bufp & Amask); \
} \
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 *bufp; \
Uint32 pixel; \
\
bufp = (Uint32 *)buf; \
PIXEL_FROM_RGB(pixel, fmt, r, g, b); \
*bufp = pixel | (*bufp & Amask); \
} \
break; \
} \
}
/* FIXME: Should we rescale alpha into 0..255 here? */
#define RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a) \
{ \
r = ((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; \
g = ((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; \
b = ((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \
a = ((pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \
}
#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 DISEMBLE_RGBA(buf, bpp, fmt, pixel, r, g, b, a) \
do { \
switch (bpp) { \
case 2: \
pixel = *((Uint16 *)(buf)); \
break; \
\
case 3: {/* FIXME: broken code (no alpha) */ \
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; \
} \
RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a); \
pixel &= ~fmt->Amask; \
} while(0)
/* FIXME: this isn't correct, especially for Alpha (maximum != 255) */
#define PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a) \
{ \
pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \
((g>>fmt->Gloss)<<fmt->Gshift)| \
((b>>fmt->Bloss)<<fmt->Bshift)| \
((a<<fmt->Aloss)<<fmt->Ashift); \
}
#define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \
{ \
switch (bpp) { \
case 2: { \
Uint16 pixel; \
\
PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a); \
*((Uint16 *)(buf)) = pixel; \
} \
break; \
\
case 3: { /* FIXME: broken code (no alpha) */ \
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; \
} \
}
/* Blend the RGB values of two pixels based on a source alpha value */
#define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \
do { \
dR = (((sR-dR)*(A))>>8)+dR; \
dG = (((sG-dG)*(A))>>8)+dG; \
dB = (((sB-dB)*(A))>>8)+dB; \
} while(0)
/* This is a very useful loop for optimizing blitters */
#define USE_DUFFS_LOOP
#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; \
case 7: pixel_copy_increment; \
case 6: pixel_copy_increment; \
case 5: pixel_copy_increment; \
case 4: pixel_copy_increment; \
case 3: pixel_copy_increment; \
case 2: pixel_copy_increment; \
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; \
case 3: pixel_copy_increment; \
case 2: pixel_copy_increment; \
case 1: pixel_copy_increment; \
} while ( --n > 0 ); \
} \
}
/* Use the 8-times version of the loop by default */
#define DUFFS_LOOP(pixel_copy_increment, width) \
DUFFS_LOOP8(pixel_copy_increment, width)
#else
/* Don't use Duff's device to unroll loops */
#define DUFFS_LOOP(pixel_copy_increment, width) \
{ int n; \
for ( n=width; n > 0; --n ) { \
pixel_copy_increment; \
} \
}
#define DUFFS_LOOP8(pixel_copy_increment, width) \
DUFFS_LOOP(pixel_copy_increment, width)
#define DUFFS_LOOP4(pixel_copy_increment, width) \
DUFFS_LOOP(pixel_copy_increment, width)
#endif /* USE_DUFFS_LOOP */
/* Prevent Visual C++ 6.0 from printing out stupid warnings */
#if defined(_MSC_VER) && (_MSC_VER >= 600)
#pragma warning(disable: 4550)
#endif
#endif /* _SDL_blit_h */