Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.h @ 689:5bb080d35049
Date: Tue, 19 Aug 2003 17:57:00 +0200
From: Stephane Marchesin
Subject: Re: [SDL] [patch] MMX alpha blit patches with MMX detection
I think everything is correct now. I've done as much testing as I could,
but some real-world testing wouldn't hurt, I think.
The patch is here : http://icps.u-strasbg.fr/~marchesin/sdl_mmxblit.patch
If you do byte-by-byte comparison of the output between C and MMX
functions, you'll notice that the results for 555 and 565 RGB alpha
blits aren't exactly the same. This is because MMX functions for 555 and
565 RGB have an higher accuracy. If you want the exact same behaviour
that's possible by masking the three lower alpha bits in the MMX
functions. Just ask !
I removed one MMX function because after I fixed it to match its C
equivalent, it revealed to be slower than the C version on a PIII
(although a bit faster on an Athlon XP).
I've also added MMX and PIII replacements for SDL_memcpy. Those provide
some speed up in testvidinfo -benchmark (at least for me, under linux &
X11).
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 22 Aug 2003 05:51:19 +0000 |
| parents | 417f8709e648 |
| children | b8d311d90021 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2002
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 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 | |
|
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20 slouken@libsdl.org |
| 0 | 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 /* Functions found in SDL_blit.c */ | |
| 75 extern int SDL_CalculateBlit(SDL_Surface *surface); | |
| 76 | |
| 77 /* Functions found in SDL_blit_{0,1,N,A}.c */ | |
| 78 extern SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int complex); | |
| 79 extern SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int complex); | |
| 80 extern SDL_loblit SDL_CalculateBlitN(SDL_Surface *surface, int complex); | |
| 81 extern SDL_loblit SDL_CalculateAlphaBlit(SDL_Surface *surface, int complex); | |
| 82 | |
| 83 /* | |
| 84 * Useful macros for blitting routines | |
| 85 */ | |
| 86 | |
| 87 #define FORMAT_EQUAL(A, B) \ | |
| 88 ((A)->BitsPerPixel == (B)->BitsPerPixel \ | |
| 89 && ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask)) | |
| 90 | |
| 91 /* Load pixel of the specified format from a buffer and get its R-G-B values */ | |
| 92 /* FIXME: rescale values to 0..255 here? */ | |
| 93 #define RGB_FROM_PIXEL(pixel, fmt, r, g, b) \ | |
| 94 { \ | |
| 95 r = (((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); \ | |
| 96 g = (((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); \ | |
| 97 b = (((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); \ | |
| 98 } | |
| 99 #define RGB_FROM_RGB565(pixel, r, g, b) \ | |
| 100 { \ | |
| 101 r = (((pixel&0xF800)>>11)<<3); \ | |
| 102 g = (((pixel&0x07E0)>>5)<<2); \ | |
| 103 b = ((pixel&0x001F)<<3); \ | |
| 104 } | |
| 105 #define RGB_FROM_RGB555(pixel, r, g, b) \ | |
| 106 { \ | |
| 107 r = (((pixel&0x7C00)>>10)<<3); \ | |
| 108 g = (((pixel&0x03E0)>>5)<<3); \ | |
| 109 b = ((pixel&0x001F)<<3); \ | |
| 110 } | |
| 111 #define RGB_FROM_RGB888(pixel, r, g, b) \ | |
| 112 { \ | |
| 113 r = ((pixel&0xFF0000)>>16); \ | |
| 114 g = ((pixel&0xFF00)>>8); \ | |
| 115 b = (pixel&0xFF); \ | |
| 116 } | |
| 117 #define RETRIEVE_RGB_PIXEL(buf, bpp, pixel) \ | |
| 118 do { \ | |
| 119 switch (bpp) { \ | |
| 120 case 2: \ | |
| 121 pixel = *((Uint16 *)(buf)); \ | |
| 122 break; \ | |
| 123 \ | |
| 124 case 3: { \ | |
| 125 Uint8 *B = (Uint8 *)(buf); \ | |
| 126 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 127 pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ | |
| 128 } else { \ | |
| 129 pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ | |
| 130 } \ | |
| 131 } \ | |
| 132 break; \ | |
| 133 \ | |
| 134 case 4: \ | |
| 135 pixel = *((Uint32 *)(buf)); \ | |
| 136 break; \ | |
| 137 \ | |
| 138 default: \ | |
| 139 pixel = 0; /* appease gcc */ \ | |
| 140 break; \ | |
| 141 } \ | |
| 142 } while(0) | |
| 143 | |
| 144 #define DISEMBLE_RGB(buf, bpp, fmt, pixel, r, g, b) \ | |
| 145 do { \ | |
| 146 switch (bpp) { \ | |
| 147 case 2: \ | |
| 148 pixel = *((Uint16 *)(buf)); \ | |
| 149 break; \ | |
| 150 \ | |
| 151 case 3: { \ | |
| 152 Uint8 *B = (Uint8 *)buf; \ | |
| 153 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 154 pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ | |
| 155 } else { \ | |
| 156 pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ | |
| 157 } \ | |
| 158 } \ | |
| 159 break; \ | |
| 160 \ | |
| 161 case 4: \ | |
| 162 pixel = *((Uint32 *)(buf)); \ | |
| 163 break; \ | |
| 164 \ | |
| 165 default: \ | |
| 166 pixel = 0; /* prevent gcc from complaining */ \ | |
| 167 break; \ | |
| 168 } \ | |
| 169 RGB_FROM_PIXEL(pixel, fmt, r, g, b); \ | |
| 170 } while(0) | |
| 171 | |
| 172 /* Assemble R-G-B values into a specified pixel format and store them */ | |
| 173 #define PIXEL_FROM_RGB(pixel, fmt, r, g, b) \ | |
| 174 { \ | |
| 175 pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ | |
| 176 ((g>>fmt->Gloss)<<fmt->Gshift)| \ | |
| 177 ((b>>fmt->Bloss)<<fmt->Bshift); \ | |
| 178 } | |
| 179 #define RGB565_FROM_RGB(pixel, r, g, b) \ | |
| 180 { \ | |
| 181 pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3); \ | |
| 182 } | |
| 183 #define RGB555_FROM_RGB(pixel, r, g, b) \ | |
| 184 { \ | |
| 185 pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3); \ | |
| 186 } | |
| 187 #define RGB888_FROM_RGB(pixel, r, g, b) \ | |
| 188 { \ | |
| 189 pixel = (r<<16)|(g<<8)|b; \ | |
| 190 } | |
| 191 #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \ | |
| 192 { \ | |
| 193 switch (bpp) { \ | |
| 194 case 2: { \ | |
| 195 Uint16 pixel; \ | |
| 196 \ | |
| 197 PIXEL_FROM_RGB(pixel, fmt, r, g, b); \ | |
| 198 *((Uint16 *)(buf)) = pixel; \ | |
| 199 } \ | |
| 200 break; \ | |
| 201 \ | |
| 202 case 3: { \ | |
| 203 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 204 *((buf)+fmt->Rshift/8) = r; \ | |
| 205 *((buf)+fmt->Gshift/8) = g; \ | |
| 206 *((buf)+fmt->Bshift/8) = b; \ | |
| 207 } else { \ | |
| 208 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 209 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 210 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 211 } \ | |
| 212 } \ | |
| 213 break; \ | |
| 214 \ | |
| 215 case 4: { \ | |
| 216 Uint32 pixel; \ | |
| 217 \ | |
| 218 PIXEL_FROM_RGB(pixel, fmt, r, g, b); \ | |
| 219 *((Uint32 *)(buf)) = pixel; \ | |
| 220 } \ | |
| 221 break; \ | |
| 222 } \ | |
| 223 } | |
| 224 #define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask) \ | |
| 225 { \ | |
| 226 switch (bpp) { \ | |
| 227 case 2: { \ | |
| 228 Uint16 *bufp; \ | |
| 229 Uint16 pixel; \ | |
| 230 \ | |
| 231 bufp = (Uint16 *)buf; \ | |
| 232 PIXEL_FROM_RGB(pixel, fmt, r, g, b); \ | |
| 233 *bufp = pixel | (*bufp & Amask); \ | |
| 234 } \ | |
| 235 break; \ | |
| 236 \ | |
| 237 case 3: { \ | |
| 238 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 239 *((buf)+fmt->Rshift/8) = r; \ | |
| 240 *((buf)+fmt->Gshift/8) = g; \ | |
| 241 *((buf)+fmt->Bshift/8) = b; \ | |
| 242 } else { \ | |
| 243 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 244 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 245 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 246 } \ | |
| 247 } \ | |
| 248 break; \ | |
| 249 \ | |
| 250 case 4: { \ | |
| 251 Uint32 *bufp; \ | |
| 252 Uint32 pixel; \ | |
| 253 \ | |
| 254 bufp = (Uint32 *)buf; \ | |
| 255 PIXEL_FROM_RGB(pixel, fmt, r, g, b); \ | |
| 256 *bufp = pixel | (*bufp & Amask); \ | |
| 257 } \ | |
| 258 break; \ | |
| 259 } \ | |
| 260 } | |
| 261 | |
| 262 /* FIXME: Should we rescale alpha into 0..255 here? */ | |
| 263 #define RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a) \ | |
| 264 { \ | |
| 265 r = ((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; \ | |
| 266 g = ((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; \ | |
| 267 b = ((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \ | |
| 268 a = ((pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \ | |
| 269 } | |
| 270 #define RGBA_FROM_8888(pixel, fmt, r, g, b, a) \ | |
| 271 { \ | |
| 272 r = (pixel&fmt->Rmask)>>fmt->Rshift; \ | |
| 273 g = (pixel&fmt->Gmask)>>fmt->Gshift; \ | |
| 274 b = (pixel&fmt->Bmask)>>fmt->Bshift; \ | |
| 275 a = (pixel&fmt->Amask)>>fmt->Ashift; \ | |
| 276 } | |
| 277 #define RGBA_FROM_RGBA8888(pixel, r, g, b, a) \ | |
| 278 { \ | |
| 279 r = (pixel>>24); \ | |
| 280 g = ((pixel>>16)&0xFF); \ | |
| 281 b = ((pixel>>8)&0xFF); \ | |
| 282 a = (pixel&0xFF); \ | |
| 283 } | |
| 284 #define RGBA_FROM_ARGB8888(pixel, r, g, b, a) \ | |
| 285 { \ | |
| 286 r = ((pixel>>16)&0xFF); \ | |
| 287 g = ((pixel>>8)&0xFF); \ | |
| 288 b = (pixel&0xFF); \ | |
| 289 a = (pixel>>24); \ | |
| 290 } | |
| 291 #define RGBA_FROM_ABGR8888(pixel, r, g, b, a) \ | |
| 292 { \ | |
| 293 r = (pixel&0xFF); \ | |
| 294 g = ((pixel>>8)&0xFF); \ | |
| 295 b = ((pixel>>16)&0xFF); \ | |
| 296 a = (pixel>>24); \ | |
| 297 } | |
| 298 #define DISEMBLE_RGBA(buf, bpp, fmt, pixel, r, g, b, a) \ | |
| 299 do { \ | |
| 300 switch (bpp) { \ | |
| 301 case 2: \ | |
| 302 pixel = *((Uint16 *)(buf)); \ | |
| 303 break; \ | |
| 304 \ | |
| 305 case 3: {/* FIXME: broken code (no alpha) */ \ | |
| 306 Uint8 *b = (Uint8 *)buf; \ | |
| 307 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 308 pixel = b[0] + (b[1] << 8) + (b[2] << 16); \ | |
| 309 } else { \ | |
| 310 pixel = (b[0] << 16) + (b[1] << 8) + b[2]; \ | |
| 311 } \ | |
| 312 } \ | |
| 313 break; \ | |
| 314 \ | |
| 315 case 4: \ | |
| 316 pixel = *((Uint32 *)(buf)); \ | |
| 317 break; \ | |
| 318 \ | |
| 319 default: \ | |
| 320 pixel = 0; /* stop gcc complaints */ \ | |
| 321 break; \ | |
| 322 } \ | |
| 323 RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a); \ | |
| 324 pixel &= ~fmt->Amask; \ | |
| 325 } while(0) | |
| 326 | |
| 327 /* FIXME: this isn't correct, especially for Alpha (maximum != 255) */ | |
| 328 #define PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a) \ | |
| 329 { \ | |
| 330 pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ | |
| 331 ((g>>fmt->Gloss)<<fmt->Gshift)| \ | |
| 332 ((b>>fmt->Bloss)<<fmt->Bshift)| \ | |
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333 ((a>>fmt->Aloss)<<fmt->Ashift); \ |
| 0 | 334 } |
| 335 #define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \ | |
| 336 { \ | |
| 337 switch (bpp) { \ | |
| 338 case 2: { \ | |
| 339 Uint16 pixel; \ | |
| 340 \ | |
| 341 PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a); \ | |
| 342 *((Uint16 *)(buf)) = pixel; \ | |
| 343 } \ | |
| 344 break; \ | |
| 345 \ | |
| 346 case 3: { /* FIXME: broken code (no alpha) */ \ | |
| 347 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 348 *((buf)+fmt->Rshift/8) = r; \ | |
| 349 *((buf)+fmt->Gshift/8) = g; \ | |
| 350 *((buf)+fmt->Bshift/8) = b; \ | |
| 351 } else { \ | |
| 352 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 353 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 354 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 355 } \ | |
| 356 } \ | |
| 357 break; \ | |
| 358 \ | |
| 359 case 4: { \ | |
| 360 Uint32 pixel; \ | |
| 361 \ | |
| 362 PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a); \ | |
| 363 *((Uint32 *)(buf)) = pixel; \ | |
| 364 } \ | |
| 365 break; \ | |
| 366 } \ | |
| 367 } | |
| 368 | |
| 369 /* Blend the RGB values of two pixels based on a source alpha value */ | |
| 370 #define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \ | |
| 371 do { \ | |
| 372 dR = (((sR-dR)*(A))>>8)+dR; \ | |
| 373 dG = (((sG-dG)*(A))>>8)+dG; \ | |
| 374 dB = (((sB-dB)*(A))>>8)+dB; \ | |
| 375 } while(0) | |
| 376 | |
| 377 /* This is a very useful loop for optimizing blitters */ | |
|
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378 #if defined(_MSC_VER) && (_MSC_VER == 1300) |
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379 /* There's a bug in the Visual C++ 7 optimizer when compiling this code */ |
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380 #else |
| 0 | 381 #define USE_DUFFS_LOOP |
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382 #endif |
| 0 | 383 #ifdef USE_DUFFS_LOOP |
| 384 | |
| 385 /* 8-times unrolled loop */ | |
| 386 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 387 { int n = (width+7)/8; \ | |
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388 switch (width & 7) { \ |
| 0 | 389 case 0: do { pixel_copy_increment; \ |
| 390 case 7: pixel_copy_increment; \ | |
| 391 case 6: pixel_copy_increment; \ | |
| 392 case 5: pixel_copy_increment; \ | |
| 393 case 4: pixel_copy_increment; \ | |
| 394 case 3: pixel_copy_increment; \ | |
| 395 case 2: pixel_copy_increment; \ | |
| 396 case 1: pixel_copy_increment; \ | |
| 397 } while ( --n > 0 ); \ | |
| 398 } \ | |
| 399 } | |
| 400 | |
| 401 /* 4-times unrolled loop */ | |
| 402 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 403 { int n = (width+3)/4; \ | |
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404 switch (width & 3) { \ |
| 0 | 405 case 0: do { pixel_copy_increment; \ |
| 406 case 3: pixel_copy_increment; \ | |
| 407 case 2: pixel_copy_increment; \ | |
| 408 case 1: pixel_copy_increment; \ | |
| 409 } while ( --n > 0 ); \ | |
| 410 } \ | |
| 411 } | |
| 412 | |
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413 /* 2 - times unrolled loop */ |
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414 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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415 double_pixel_copy_increment, width) \ |
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416 { int n, w = width; \ |
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417 if( w & 1 ) { \ |
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418 pixel_copy_increment; \ |
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419 w--; \ |
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420 } \ |
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421 if ( w > 0 ) { \ |
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422 n = ( w + 2) / 4; \ |
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423 switch( w & 2 ) { \ |
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424 case 0: do { double_pixel_copy_increment; \ |
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425 case 2: double_pixel_copy_increment; \ |
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426 } while ( --n > 0 ); \ |
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427 } \ |
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428 } \ |
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429 } |
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430 |
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431 /* 2 - times unrolled loop 4 pixels */ |
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432 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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433 double_pixel_copy_increment, \ |
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434 quatro_pixel_copy_increment, width) \ |
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435 { int n, w = width; \ |
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436 if(w & 1) { \ |
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437 pixel_copy_increment; \ |
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438 w--; \ |
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439 } \ |
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440 if(w & 2) { \ |
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441 double_pixel_copy_increment; \ |
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442 w -= 2; \ |
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443 } \ |
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444 if ( w > 0 ) { \ |
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445 n = ( w + 7 ) / 8; \ |
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446 switch( w & 4 ) { \ |
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447 case 0: do { quatro_pixel_copy_increment; \ |
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448 case 4: quatro_pixel_copy_increment; \ |
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449 } while ( --n > 0 ); \ |
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450 } \ |
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451 } \ |
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452 } |
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453 |
| 0 | 454 /* Use the 8-times version of the loop by default */ |
| 455 #define DUFFS_LOOP(pixel_copy_increment, width) \ | |
| 456 DUFFS_LOOP8(pixel_copy_increment, width) | |
| 457 | |
| 458 #else | |
| 459 | |
| 460 /* Don't use Duff's device to unroll loops */ | |
|
689
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461 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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462 double_pixel_copy_increment, width) \ |
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463 { int n = width; \ |
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464 if( n & 1 ) { \ |
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465 pixel_copy_increment; \ |
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466 n--; \ |
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467 } \ |
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468 n=n>>1; \ |
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469 for(; n > 0; --n) { \ |
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470 double_pixel_copy_increment; \ |
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471 } \ |
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472 } |
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473 |
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474 /* Don't use Duff's device to unroll loops */ |
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475 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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476 double_pixel_copy_increment, \ |
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477 quatro_pixel_copy_increment, width) \ |
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478 { int n = width; \ |
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479 if(n & 1) { \ |
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480 pixel_copy_increment; \ |
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481 n--; \ |
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482 } \ |
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483 if(n & 2) { \ |
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484 double_pixel_copy_increment; \ |
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485 n -= 2; \ |
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486 } \ |
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487 n=n>>2; \ |
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488 for(; n > 0; --n) { \ |
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489 quatro_pixel_copy_increment; \ |
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490 } \ |
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491 } |
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492 |
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493 /* Don't use Duff's device to unroll loops */ |
| 0 | 494 #define DUFFS_LOOP(pixel_copy_increment, width) \ |
| 495 { int n; \ | |
| 496 for ( n=width; n > 0; --n ) { \ | |
| 497 pixel_copy_increment; \ | |
| 498 } \ | |
| 499 } | |
| 500 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 501 DUFFS_LOOP(pixel_copy_increment, width) | |
| 502 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 503 DUFFS_LOOP(pixel_copy_increment, width) | |
| 504 | |
| 505 #endif /* USE_DUFFS_LOOP */ | |
| 506 | |
| 507 /* Prevent Visual C++ 6.0 from printing out stupid warnings */ | |
| 508 #if defined(_MSC_VER) && (_MSC_VER >= 600) | |
| 509 #pragma warning(disable: 4550) | |
| 510 #endif | |
| 511 | |
| 512 #endif /* _SDL_blit_h */ |