Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.h @ 1230:88c2d6aed428
From Mike Frysinger and/or Gentoo:
- libsdl-PIC-load-mmx-masks-from-stack.patch
this one may be a little controversial ... the fix here is again that you cant
reference the memory addresses like this to load into a mmx register, so the
way to do it is to push two 32bit words onto the stack, load the 64bit value
off of the stack into the mmx register, and then adjust the stack so that
it's back to normal.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 05 Jan 2006 15:25:19 +0000 |
| parents | 2651158f59b8 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2004 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? */ | |
|
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93 #define RGB_FROM_PIXEL(Pixel, fmt, r, g, b) \ |
| 0 | 94 { \ |
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95 r = (((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); \ |
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96 g = (((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); \ |
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97 b = (((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); \ |
| 0 | 98 } |
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99 #define RGB_FROM_RGB565(Pixel, r, g, b) \ |
| 0 | 100 { \ |
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101 r = (((Pixel&0xF800)>>11)<<3); \ |
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102 g = (((Pixel&0x07E0)>>5)<<2); \ |
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103 b = ((Pixel&0x001F)<<3); \ |
| 0 | 104 } |
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105 #define RGB_FROM_RGB555(Pixel, r, g, b) \ |
| 0 | 106 { \ |
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107 r = (((Pixel&0x7C00)>>10)<<3); \ |
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108 g = (((Pixel&0x03E0)>>5)<<3); \ |
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109 b = ((Pixel&0x001F)<<3); \ |
| 0 | 110 } |
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111 #define RGB_FROM_RGB888(Pixel, r, g, b) \ |
| 0 | 112 { \ |
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113 r = ((Pixel&0xFF0000)>>16); \ |
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114 g = ((Pixel&0xFF00)>>8); \ |
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115 b = (Pixel&0xFF); \ |
| 0 | 116 } |
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117 #define RETRIEVE_RGB_PIXEL(buf, bpp, Pixel) \ |
| 0 | 118 do { \ |
| 119 switch (bpp) { \ | |
| 120 case 2: \ | |
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121 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 122 break; \ |
| 123 \ | |
| 124 case 3: { \ | |
| 125 Uint8 *B = (Uint8 *)(buf); \ | |
| 126 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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127 Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ |
| 0 | 128 } else { \ |
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129 Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ |
| 0 | 130 } \ |
| 131 } \ | |
| 132 break; \ | |
| 133 \ | |
| 134 case 4: \ | |
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135 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 136 break; \ |
| 137 \ | |
| 138 default: \ | |
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139 Pixel = 0; /* appease gcc */ \ |
| 0 | 140 break; \ |
| 141 } \ | |
| 142 } while(0) | |
| 143 | |
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144 #define DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b) \ |
| 0 | 145 do { \ |
| 146 switch (bpp) { \ | |
| 147 case 2: \ | |
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148 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 149 break; \ |
| 150 \ | |
| 151 case 3: { \ | |
| 152 Uint8 *B = (Uint8 *)buf; \ | |
| 153 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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154 Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ |
| 0 | 155 } else { \ |
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156 Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ |
| 0 | 157 } \ |
| 158 } \ | |
| 159 break; \ | |
| 160 \ | |
| 161 case 4: \ | |
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162 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 163 break; \ |
| 164 \ | |
| 165 default: \ | |
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166 Pixel = 0; /* prevent gcc from complaining */ \ |
| 0 | 167 break; \ |
| 168 } \ | |
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169 RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \ |
| 0 | 170 } while(0) |
| 171 | |
| 172 /* Assemble R-G-B values into a specified pixel format and store them */ | |
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173 #define PIXEL_FROM_RGB(Pixel, fmt, r, g, b) \ |
| 0 | 174 { \ |
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175 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
| 0 | 176 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
| 177 ((b>>fmt->Bloss)<<fmt->Bshift); \ | |
| 178 } | |
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179 #define RGB565_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 180 { \ |
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181 Pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3); \ |
| 0 | 182 } |
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183 #define RGB555_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 184 { \ |
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185 Pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3); \ |
| 0 | 186 } |
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187 #define RGB888_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 188 { \ |
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189 Pixel = (r<<16)|(g<<8)|b; \ |
| 0 | 190 } |
| 191 #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \ | |
| 192 { \ | |
| 193 switch (bpp) { \ | |
| 194 case 2: { \ | |
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195 Uint16 Pixel; \ |
| 0 | 196 \ |
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197 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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198 *((Uint16 *)(buf)) = Pixel; \ |
| 0 | 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: { \ | |
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216 Uint32 Pixel; \ |
| 0 | 217 \ |
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218 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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219 *((Uint32 *)(buf)) = Pixel; \ |
| 0 | 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; \ | |
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229 Uint16 Pixel; \ |
| 0 | 230 \ |
| 231 bufp = (Uint16 *)buf; \ | |
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232 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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233 *bufp = Pixel | (*bufp & Amask); \ |
| 0 | 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; \ | |
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252 Uint32 Pixel; \ |
| 0 | 253 \ |
| 254 bufp = (Uint32 *)buf; \ | |
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255 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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256 *bufp = Pixel | (*bufp & Amask); \ |
| 0 | 257 } \ |
| 258 break; \ | |
| 259 } \ | |
| 260 } | |
| 261 | |
| 262 /* FIXME: Should we rescale alpha into 0..255 here? */ | |
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263 #define RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a) \ |
| 0 | 264 { \ |
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265 r = ((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; \ |
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266 g = ((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; \ |
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267 b = ((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \ |
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268 a = ((Pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \ |
| 0 | 269 } |
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270 #define RGBA_FROM_8888(Pixel, fmt, r, g, b, a) \ |
| 0 | 271 { \ |
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272 r = (Pixel&fmt->Rmask)>>fmt->Rshift; \ |
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273 g = (Pixel&fmt->Gmask)>>fmt->Gshift; \ |
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274 b = (Pixel&fmt->Bmask)>>fmt->Bshift; \ |
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275 a = (Pixel&fmt->Amask)>>fmt->Ashift; \ |
| 0 | 276 } |
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277 #define RGBA_FROM_RGBA8888(Pixel, r, g, b, a) \ |
| 0 | 278 { \ |
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279 r = (Pixel>>24); \ |
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280 g = ((Pixel>>16)&0xFF); \ |
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281 b = ((Pixel>>8)&0xFF); \ |
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282 a = (Pixel&0xFF); \ |
| 0 | 283 } |
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284 #define RGBA_FROM_ARGB8888(Pixel, r, g, b, a) \ |
| 0 | 285 { \ |
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286 r = ((Pixel>>16)&0xFF); \ |
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287 g = ((Pixel>>8)&0xFF); \ |
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288 b = (Pixel&0xFF); \ |
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289 a = (Pixel>>24); \ |
| 0 | 290 } |
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291 #define RGBA_FROM_ABGR8888(Pixel, r, g, b, a) \ |
| 0 | 292 { \ |
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293 r = (Pixel&0xFF); \ |
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294 g = ((Pixel>>8)&0xFF); \ |
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295 b = ((Pixel>>16)&0xFF); \ |
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296 a = (Pixel>>24); \ |
| 0 | 297 } |
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298 #define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a) \ |
| 0 | 299 do { \ |
| 300 switch (bpp) { \ | |
| 301 case 2: \ | |
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302 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 303 break; \ |
| 304 \ | |
| 305 case 3: {/* FIXME: broken code (no alpha) */ \ | |
| 306 Uint8 *b = (Uint8 *)buf; \ | |
| 307 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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308 Pixel = b[0] + (b[1] << 8) + (b[2] << 16); \ |
| 0 | 309 } else { \ |
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310 Pixel = (b[0] << 16) + (b[1] << 8) + b[2]; \ |
| 0 | 311 } \ |
| 312 } \ | |
| 313 break; \ | |
| 314 \ | |
| 315 case 4: \ | |
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316 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 317 break; \ |
| 318 \ | |
| 319 default: \ | |
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320 Pixel = 0; /* stop gcc complaints */ \ |
| 0 | 321 break; \ |
| 322 } \ | |
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323 RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \ |
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324 Pixel &= ~fmt->Amask; \ |
| 0 | 325 } while(0) |
| 326 | |
| 327 /* FIXME: this isn't correct, especially for Alpha (maximum != 255) */ | |
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328 #define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a) \ |
| 0 | 329 { \ |
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330 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
| 0 | 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: { \ | |
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339 Uint16 Pixel; \ |
| 0 | 340 \ |
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341 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \ |
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342 *((Uint16 *)(buf)) = Pixel; \ |
| 0 | 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: { \ | |
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360 Uint32 Pixel; \ |
| 0 | 361 \ |
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362 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \ |
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363 *((Uint32 *)(buf)) = Pixel; \ |
| 0 | 364 } \ |
| 365 break; \ | |
| 366 } \ | |
| 367 } | |
| 368 | |
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369 /* Blend the RGB values of two Pixels based on a source alpha value */ |
| 0 | 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 | |
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377 /* Blend the RGB values of two Pixels based on a source alpha value */ |
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378 #define ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB) \ |
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379 do { \ |
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380 unsigned tR, tG, tB, tA; \ |
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381 tA = 255 - sA; \ |
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382 tR = 1 + (sR * sA) + (dR * tA); \ |
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383 dR = (tR + (tR >> 8)) >> 8; \ |
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384 tG = 1 + (sG * sA) + (dG * tA); \ |
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385 dG = (tG + (tG >> 8)) >> 8; \ |
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386 tB = 1 + (sB * sA) + (dB * tA); \ |
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387 dB = (tB + (tB >> 8)) >> 8; \ |
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388 } while(0) |
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389 |
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390 |
| 0 | 391 /* This is a very useful loop for optimizing blitters */ |
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392 #if defined(_MSC_VER) && (_MSC_VER == 1300) |
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393 /* There's a bug in the Visual C++ 7 optimizer when compiling this code */ |
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394 #else |
| 0 | 395 #define USE_DUFFS_LOOP |
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396 #endif |
| 0 | 397 #ifdef USE_DUFFS_LOOP |
| 398 | |
| 399 /* 8-times unrolled loop */ | |
| 400 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 401 { int n = (width+7)/8; \ | |
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402 switch (width & 7) { \ |
| 0 | 403 case 0: do { pixel_copy_increment; \ |
| 404 case 7: pixel_copy_increment; \ | |
| 405 case 6: pixel_copy_increment; \ | |
| 406 case 5: pixel_copy_increment; \ | |
| 407 case 4: pixel_copy_increment; \ | |
| 408 case 3: pixel_copy_increment; \ | |
| 409 case 2: pixel_copy_increment; \ | |
| 410 case 1: pixel_copy_increment; \ | |
| 411 } while ( --n > 0 ); \ | |
| 412 } \ | |
| 413 } | |
| 414 | |
| 415 /* 4-times unrolled loop */ | |
| 416 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 417 { int n = (width+3)/4; \ | |
|
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418 switch (width & 3) { \ |
| 0 | 419 case 0: do { pixel_copy_increment; \ |
| 420 case 3: pixel_copy_increment; \ | |
| 421 case 2: pixel_copy_increment; \ | |
| 422 case 1: pixel_copy_increment; \ | |
| 423 } while ( --n > 0 ); \ | |
| 424 } \ | |
| 425 } | |
| 426 | |
|
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427 /* 2 - times unrolled loop */ |
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428 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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429 double_pixel_copy_increment, width) \ |
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430 { int n, w = width; \ |
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431 if( w & 1 ) { \ |
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432 pixel_copy_increment; \ |
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433 w--; \ |
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434 } \ |
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435 if ( w > 0 ) { \ |
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436 n = ( w + 2) / 4; \ |
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437 switch( w & 2 ) { \ |
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438 case 0: do { double_pixel_copy_increment; \ |
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439 case 2: double_pixel_copy_increment; \ |
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440 } while ( --n > 0 ); \ |
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441 } \ |
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442 } \ |
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443 } |
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444 |
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445 /* 2 - times unrolled loop 4 pixels */ |
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446 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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447 double_pixel_copy_increment, \ |
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448 quatro_pixel_copy_increment, width) \ |
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449 { int n, w = width; \ |
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450 if(w & 1) { \ |
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451 pixel_copy_increment; \ |
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452 w--; \ |
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453 } \ |
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454 if(w & 2) { \ |
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455 double_pixel_copy_increment; \ |
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456 w -= 2; \ |
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457 } \ |
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458 if ( w > 0 ) { \ |
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459 n = ( w + 7 ) / 8; \ |
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460 switch( w & 4 ) { \ |
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461 case 0: do { quatro_pixel_copy_increment; \ |
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462 case 4: quatro_pixel_copy_increment; \ |
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463 } while ( --n > 0 ); \ |
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464 } \ |
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465 } \ |
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466 } |
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467 |
| 0 | 468 /* Use the 8-times version of the loop by default */ |
| 469 #define DUFFS_LOOP(pixel_copy_increment, width) \ | |
| 470 DUFFS_LOOP8(pixel_copy_increment, width) | |
| 471 | |
| 472 #else | |
| 473 | |
| 474 /* Don't use Duff's device to unroll loops */ | |
|
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475 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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476 double_pixel_copy_increment, width) \ |
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477 { int n = width; \ |
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Date: Tue, 19 Aug 2003 17:57:00 +0200
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478 if( n & 1 ) { \ |
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479 pixel_copy_increment; \ |
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480 n--; \ |
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481 } \ |
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482 n=n>>1; \ |
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483 for(; n > 0; --n) { \ |
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484 double_pixel_copy_increment; \ |
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485 } \ |
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486 } |
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487 |
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488 /* Don't use Duff's device to unroll loops */ |
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489 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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490 double_pixel_copy_increment, \ |
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491 quatro_pixel_copy_increment, width) \ |
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492 { int n = width; \ |
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493 if(n & 1) { \ |
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494 pixel_copy_increment; \ |
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495 n--; \ |
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496 } \ |
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497 if(n & 2) { \ |
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498 double_pixel_copy_increment; \ |
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499 n -= 2; \ |
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500 } \ |
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501 n=n>>2; \ |
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502 for(; n > 0; --n) { \ |
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503 quatro_pixel_copy_increment; \ |
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504 } \ |
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505 } |
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Date: Tue, 19 Aug 2003 17:57:00 +0200
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506 |
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Date: Tue, 19 Aug 2003 17:57:00 +0200
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507 /* Don't use Duff's device to unroll loops */ |
| 0 | 508 #define DUFFS_LOOP(pixel_copy_increment, width) \ |
| 509 { int n; \ | |
| 510 for ( n=width; n > 0; --n ) { \ | |
| 511 pixel_copy_increment; \ | |
| 512 } \ | |
| 513 } | |
| 514 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 515 DUFFS_LOOP(pixel_copy_increment, width) | |
| 516 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 517 DUFFS_LOOP(pixel_copy_increment, width) | |
| 518 | |
| 519 #endif /* USE_DUFFS_LOOP */ | |
| 520 | |
| 521 /* Prevent Visual C++ 6.0 from printing out stupid warnings */ | |
| 522 #if defined(_MSC_VER) && (_MSC_VER >= 600) | |
| 523 #pragma warning(disable: 4550) | |
| 524 #endif | |
| 525 | |
| 526 #endif /* _SDL_blit_h */ |