Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.h @ 91:e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Subject: SDL CVS patches
below you will find some small patches against the
current SDL CVS.
It adresses these things:
1) Use "&" instead of "%" in some cases. For negative
signed integers (x % 8) is not always (x & 7),
and the compiler can produce slightly faster
code when using "&" here.
2) Some const issues.
| author | Sam Lantinga <slouken@lokigames.com> |
|---|---|
| date | Sat, 07 Jul 2001 20:20:17 +0000 |
| parents | 74212992fb08 |
| children | 2dc7252dc53e |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga | |
| 4 | |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
| 20 slouken@devolution.com | |
| 21 */ | |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #ifndef _SDL_blit_h | |
| 29 #define _SDL_blit_h | |
| 30 | |
| 31 #include "SDL_endian.h" | |
| 32 | |
| 33 /* The structure passed to the low level blit functions */ | |
| 34 typedef struct { | |
| 35 Uint8 *s_pixels; | |
| 36 int s_width; | |
| 37 int s_height; | |
| 38 int s_skip; | |
| 39 Uint8 *d_pixels; | |
| 40 int d_width; | |
| 41 int d_height; | |
| 42 int d_skip; | |
| 43 void *aux_data; | |
| 44 SDL_PixelFormat *src; | |
| 45 Uint8 *table; | |
| 46 SDL_PixelFormat *dst; | |
| 47 } SDL_BlitInfo; | |
| 48 | |
| 49 /* The type definition for the low level blit functions */ | |
| 50 typedef void (*SDL_loblit)(SDL_BlitInfo *info); | |
| 51 | |
| 52 /* This is the private info structure for software accelerated blits */ | |
| 53 struct private_swaccel { | |
| 54 SDL_loblit blit; | |
| 55 void *aux_data; | |
| 56 }; | |
| 57 | |
| 58 /* Blit mapping definition */ | |
| 59 typedef struct SDL_BlitMap { | |
| 60 SDL_Surface *dst; | |
| 61 int identity; | |
| 62 Uint8 *table; | |
| 63 SDL_blit hw_blit; | |
| 64 SDL_blit sw_blit; | |
| 65 struct private_hwaccel *hw_data; | |
| 66 struct private_swaccel *sw_data; | |
| 67 | |
| 68 /* the version count matches the destination; mismatch indicates | |
| 69 an invalid mapping */ | |
| 70 unsigned int format_version; | |
| 71 } SDL_BlitMap; | |
| 72 | |
| 73 | |
| 74 /* Definitions for special global blit functions */ | |
| 75 #include "SDL_blit_A.h" | |
| 76 | |
| 77 /* Functions found in SDL_blit.c */ | |
| 78 extern int SDL_CalculateBlit(SDL_Surface *surface); | |
| 79 | |
| 80 /* Functions found in SDL_blit_{0,1,N,A}.c */ | |
| 81 extern SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int complex); | |
| 82 extern SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int complex); | |
| 83 extern SDL_loblit SDL_CalculateBlitN(SDL_Surface *surface, int complex); | |
| 84 extern SDL_loblit SDL_CalculateAlphaBlit(SDL_Surface *surface, int complex); | |
| 85 | |
| 86 /* | |
| 87 * Useful macros for blitting routines | |
| 88 */ | |
| 89 | |
| 90 #define FORMAT_EQUAL(A, B) \ | |
| 91 ((A)->BitsPerPixel == (B)->BitsPerPixel \ | |
| 92 && ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask)) | |
| 93 | |
| 94 /* Load pixel of the specified format from a buffer and get its R-G-B values */ | |
| 95 /* FIXME: rescale values to 0..255 here? */ | |
| 96 #define RGB_FROM_PIXEL(pixel, fmt, r, g, b) \ | |
| 97 { \ | |
| 98 r = (((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); \ | |
| 99 g = (((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); \ | |
| 100 b = (((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); \ | |
| 101 } | |
| 102 #define RGB_FROM_RGB565(pixel, r, g, b) \ | |
| 103 { \ | |
| 104 r = (((pixel&0xF800)>>11)<<3); \ | |
| 105 g = (((pixel&0x07E0)>>5)<<2); \ | |
| 106 b = ((pixel&0x001F)<<3); \ | |
| 107 } | |
| 108 #define RGB_FROM_RGB555(pixel, r, g, b) \ | |
| 109 { \ | |
| 110 r = (((pixel&0x7C00)>>10)<<3); \ | |
| 111 g = (((pixel&0x03E0)>>5)<<3); \ | |
| 112 b = ((pixel&0x001F)<<3); \ | |
| 113 } | |
| 114 #define RGB_FROM_RGB888(pixel, r, g, b) \ | |
| 115 { \ | |
| 116 r = ((pixel&0xFF0000)>>16); \ | |
| 117 g = ((pixel&0xFF00)>>8); \ | |
| 118 b = (pixel&0xFF); \ | |
| 119 } | |
| 120 #define RETRIEVE_RGB_PIXEL(buf, bpp, pixel) \ | |
| 121 do { \ | |
| 122 switch (bpp) { \ | |
| 123 case 2: \ | |
| 124 pixel = *((Uint16 *)(buf)); \ | |
| 125 break; \ | |
| 126 \ | |
| 127 case 3: { \ | |
| 128 Uint8 *B = (Uint8 *)(buf); \ | |
| 129 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 130 pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ | |
| 131 } else { \ | |
| 132 pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ | |
| 133 } \ | |
| 134 } \ | |
| 135 break; \ | |
| 136 \ | |
| 137 case 4: \ | |
| 138 pixel = *((Uint32 *)(buf)); \ | |
| 139 break; \ | |
| 140 \ | |
| 141 default: \ | |
| 142 pixel = 0; /* appease gcc */ \ | |
| 143 break; \ | |
| 144 } \ | |
| 145 } while(0) | |
| 146 | |
| 147 #define DISEMBLE_RGB(buf, bpp, fmt, pixel, r, g, b) \ | |
| 148 do { \ | |
| 149 switch (bpp) { \ | |
| 150 case 2: \ | |
| 151 pixel = *((Uint16 *)(buf)); \ | |
| 152 break; \ | |
| 153 \ | |
| 154 case 3: { \ | |
| 155 Uint8 *B = (Uint8 *)buf; \ | |
| 156 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 157 pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ | |
| 158 } else { \ | |
| 159 pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ | |
| 160 } \ | |
| 161 } \ | |
| 162 break; \ | |
| 163 \ | |
| 164 case 4: \ | |
| 165 pixel = *((Uint32 *)(buf)); \ | |
| 166 break; \ | |
| 167 \ | |
| 168 default: \ | |
| 169 pixel = 0; /* prevent gcc from complaining */ \ | |
| 170 break; \ | |
| 171 } \ | |
| 172 RGB_FROM_PIXEL(pixel, fmt, r, g, b); \ | |
| 173 } while(0) | |
| 174 | |
| 175 /* Assemble R-G-B values into a specified pixel format and store them */ | |
| 176 #define PIXEL_FROM_RGB(pixel, fmt, r, g, b) \ | |
| 177 { \ | |
| 178 pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ | |
| 179 ((g>>fmt->Gloss)<<fmt->Gshift)| \ | |
| 180 ((b>>fmt->Bloss)<<fmt->Bshift); \ | |
| 181 } | |
| 182 #define RGB565_FROM_RGB(pixel, r, g, b) \ | |
| 183 { \ | |
| 184 pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3); \ | |
| 185 } | |
| 186 #define RGB555_FROM_RGB(pixel, r, g, b) \ | |
| 187 { \ | |
| 188 pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3); \ | |
| 189 } | |
| 190 #define RGB888_FROM_RGB(pixel, r, g, b) \ | |
| 191 { \ | |
| 192 pixel = (r<<16)|(g<<8)|b; \ | |
| 193 } | |
| 194 #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \ | |
| 195 { \ | |
| 196 switch (bpp) { \ | |
| 197 case 2: { \ | |
| 198 Uint16 pixel; \ | |
| 199 \ | |
| 200 PIXEL_FROM_RGB(pixel, fmt, r, g, b); \ | |
| 201 *((Uint16 *)(buf)) = pixel; \ | |
| 202 } \ | |
| 203 break; \ | |
| 204 \ | |
| 205 case 3: { \ | |
| 206 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 207 *((buf)+fmt->Rshift/8) = r; \ | |
| 208 *((buf)+fmt->Gshift/8) = g; \ | |
| 209 *((buf)+fmt->Bshift/8) = b; \ | |
| 210 } else { \ | |
| 211 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 212 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 213 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 214 } \ | |
| 215 } \ | |
| 216 break; \ | |
| 217 \ | |
| 218 case 4: { \ | |
| 219 Uint32 pixel; \ | |
| 220 \ | |
| 221 PIXEL_FROM_RGB(pixel, fmt, r, g, b); \ | |
| 222 *((Uint32 *)(buf)) = pixel; \ | |
| 223 } \ | |
| 224 break; \ | |
| 225 } \ | |
| 226 } | |
| 227 #define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask) \ | |
| 228 { \ | |
| 229 switch (bpp) { \ | |
| 230 case 2: { \ | |
| 231 Uint16 *bufp; \ | |
| 232 Uint16 pixel; \ | |
| 233 \ | |
| 234 bufp = (Uint16 *)buf; \ | |
| 235 PIXEL_FROM_RGB(pixel, fmt, r, g, b); \ | |
| 236 *bufp = pixel | (*bufp & Amask); \ | |
| 237 } \ | |
| 238 break; \ | |
| 239 \ | |
| 240 case 3: { \ | |
| 241 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 242 *((buf)+fmt->Rshift/8) = r; \ | |
| 243 *((buf)+fmt->Gshift/8) = g; \ | |
| 244 *((buf)+fmt->Bshift/8) = b; \ | |
| 245 } else { \ | |
| 246 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 247 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 248 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 249 } \ | |
| 250 } \ | |
| 251 break; \ | |
| 252 \ | |
| 253 case 4: { \ | |
| 254 Uint32 *bufp; \ | |
| 255 Uint32 pixel; \ | |
| 256 \ | |
| 257 bufp = (Uint32 *)buf; \ | |
| 258 PIXEL_FROM_RGB(pixel, fmt, r, g, b); \ | |
| 259 *bufp = pixel | (*bufp & Amask); \ | |
| 260 } \ | |
| 261 break; \ | |
| 262 } \ | |
| 263 } | |
| 264 | |
| 265 /* FIXME: Should we rescale alpha into 0..255 here? */ | |
| 266 #define RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a) \ | |
| 267 { \ | |
| 268 r = ((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; \ | |
| 269 g = ((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; \ | |
| 270 b = ((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \ | |
| 271 a = ((pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \ | |
| 272 } | |
| 273 #define RGBA_FROM_8888(pixel, fmt, r, g, b, a) \ | |
| 274 { \ | |
| 275 r = (pixel&fmt->Rmask)>>fmt->Rshift; \ | |
| 276 g = (pixel&fmt->Gmask)>>fmt->Gshift; \ | |
| 277 b = (pixel&fmt->Bmask)>>fmt->Bshift; \ | |
| 278 a = (pixel&fmt->Amask)>>fmt->Ashift; \ | |
| 279 } | |
| 280 #define RGBA_FROM_RGBA8888(pixel, r, g, b, a) \ | |
| 281 { \ | |
| 282 r = (pixel>>24); \ | |
| 283 g = ((pixel>>16)&0xFF); \ | |
| 284 b = ((pixel>>8)&0xFF); \ | |
| 285 a = (pixel&0xFF); \ | |
| 286 } | |
| 287 #define RGBA_FROM_ARGB8888(pixel, r, g, b, a) \ | |
| 288 { \ | |
| 289 r = ((pixel>>16)&0xFF); \ | |
| 290 g = ((pixel>>8)&0xFF); \ | |
| 291 b = (pixel&0xFF); \ | |
| 292 a = (pixel>>24); \ | |
| 293 } | |
| 294 #define RGBA_FROM_ABGR8888(pixel, r, g, b, a) \ | |
| 295 { \ | |
| 296 r = (pixel&0xFF); \ | |
| 297 g = ((pixel>>8)&0xFF); \ | |
| 298 b = ((pixel>>16)&0xFF); \ | |
| 299 a = (pixel>>24); \ | |
| 300 } | |
| 301 #define DISEMBLE_RGBA(buf, bpp, fmt, pixel, r, g, b, a) \ | |
| 302 do { \ | |
| 303 switch (bpp) { \ | |
| 304 case 2: \ | |
| 305 pixel = *((Uint16 *)(buf)); \ | |
| 306 break; \ | |
| 307 \ | |
| 308 case 3: {/* FIXME: broken code (no alpha) */ \ | |
| 309 Uint8 *b = (Uint8 *)buf; \ | |
| 310 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 311 pixel = b[0] + (b[1] << 8) + (b[2] << 16); \ | |
| 312 } else { \ | |
| 313 pixel = (b[0] << 16) + (b[1] << 8) + b[2]; \ | |
| 314 } \ | |
| 315 } \ | |
| 316 break; \ | |
| 317 \ | |
| 318 case 4: \ | |
| 319 pixel = *((Uint32 *)(buf)); \ | |
| 320 break; \ | |
| 321 \ | |
| 322 default: \ | |
| 323 pixel = 0; /* stop gcc complaints */ \ | |
| 324 break; \ | |
| 325 } \ | |
| 326 RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a); \ | |
| 327 pixel &= ~fmt->Amask; \ | |
| 328 } while(0) | |
| 329 | |
| 330 /* FIXME: this isn't correct, especially for Alpha (maximum != 255) */ | |
| 331 #define PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a) \ | |
| 332 { \ | |
| 333 pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ | |
| 334 ((g>>fmt->Gloss)<<fmt->Gshift)| \ | |
| 335 ((b>>fmt->Bloss)<<fmt->Bshift)| \ | |
| 336 ((a<<fmt->Aloss)<<fmt->Ashift); \ | |
| 337 } | |
| 338 #define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \ | |
| 339 { \ | |
| 340 switch (bpp) { \ | |
| 341 case 2: { \ | |
| 342 Uint16 pixel; \ | |
| 343 \ | |
| 344 PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a); \ | |
| 345 *((Uint16 *)(buf)) = pixel; \ | |
| 346 } \ | |
| 347 break; \ | |
| 348 \ | |
| 349 case 3: { /* FIXME: broken code (no alpha) */ \ | |
| 350 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 351 *((buf)+fmt->Rshift/8) = r; \ | |
| 352 *((buf)+fmt->Gshift/8) = g; \ | |
| 353 *((buf)+fmt->Bshift/8) = b; \ | |
| 354 } else { \ | |
| 355 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 356 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 357 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 358 } \ | |
| 359 } \ | |
| 360 break; \ | |
| 361 \ | |
| 362 case 4: { \ | |
| 363 Uint32 pixel; \ | |
| 364 \ | |
| 365 PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a); \ | |
| 366 *((Uint32 *)(buf)) = pixel; \ | |
| 367 } \ | |
| 368 break; \ | |
| 369 } \ | |
| 370 } | |
| 371 | |
| 372 /* Blend the RGB values of two pixels based on a source alpha value */ | |
| 373 #define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \ | |
| 374 do { \ | |
| 375 dR = (((sR-dR)*(A))>>8)+dR; \ | |
| 376 dG = (((sG-dG)*(A))>>8)+dG; \ | |
| 377 dB = (((sB-dB)*(A))>>8)+dB; \ | |
| 378 } while(0) | |
| 379 | |
| 380 /* This is a very useful loop for optimizing blitters */ | |
| 381 #define USE_DUFFS_LOOP | |
| 382 #ifdef USE_DUFFS_LOOP | |
| 383 | |
| 384 /* 8-times unrolled loop */ | |
| 385 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 386 { int n = (width+7)/8; \ | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
387 switch (width & 7) { \ |
| 0 | 388 case 0: do { pixel_copy_increment; \ |
| 389 case 7: pixel_copy_increment; \ | |
| 390 case 6: pixel_copy_increment; \ | |
| 391 case 5: pixel_copy_increment; \ | |
| 392 case 4: pixel_copy_increment; \ | |
| 393 case 3: pixel_copy_increment; \ | |
| 394 case 2: pixel_copy_increment; \ | |
| 395 case 1: pixel_copy_increment; \ | |
| 396 } while ( --n > 0 ); \ | |
| 397 } \ | |
| 398 } | |
| 399 | |
| 400 /* 4-times unrolled loop */ | |
| 401 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 402 { int n = (width+3)/4; \ | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
403 switch (width & 3) { \ |
| 0 | 404 case 0: do { pixel_copy_increment; \ |
| 405 case 3: pixel_copy_increment; \ | |
| 406 case 2: pixel_copy_increment; \ | |
| 407 case 1: pixel_copy_increment; \ | |
| 408 } while ( --n > 0 ); \ | |
| 409 } \ | |
| 410 } | |
| 411 | |
| 412 /* Use the 8-times version of the loop by default */ | |
| 413 #define DUFFS_LOOP(pixel_copy_increment, width) \ | |
| 414 DUFFS_LOOP8(pixel_copy_increment, width) | |
| 415 | |
| 416 #else | |
| 417 | |
| 418 /* Don't use Duff's device to unroll loops */ | |
| 419 #define DUFFS_LOOP(pixel_copy_increment, width) \ | |
| 420 { int n; \ | |
| 421 for ( n=width; n > 0; --n ) { \ | |
| 422 pixel_copy_increment; \ | |
| 423 } \ | |
| 424 } | |
| 425 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 426 DUFFS_LOOP(pixel_copy_increment, width) | |
| 427 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 428 DUFFS_LOOP(pixel_copy_increment, width) | |
| 429 | |
| 430 #endif /* USE_DUFFS_LOOP */ | |
| 431 | |
| 432 /* Prevent Visual C++ 6.0 from printing out stupid warnings */ | |
| 433 #if defined(_MSC_VER) && (_MSC_VER >= 600) | |
| 434 #pragma warning(disable: 4550) | |
| 435 #endif | |
| 436 | |
| 437 #endif /* _SDL_blit_h */ |