Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.h @ 4025:3ee8c808638b SDL-1.2
Removed note about initializing mixing buffers.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Mon, 09 Jul 2007 00:26:21 +0000 |
| parents | 8582c6a5ca16 |
| children | a1b03ba2fcd0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 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 | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 #ifndef _SDL_blit_h | |
| 25 #define _SDL_blit_h | |
| 26 | |
| 27 #include "SDL_endian.h" | |
| 28 | |
| 29 /* The structure passed to the low level blit functions */ | |
| 30 typedef struct { | |
| 31 Uint8 *s_pixels; | |
| 32 int s_width; | |
| 33 int s_height; | |
| 34 int s_skip; | |
| 35 Uint8 *d_pixels; | |
| 36 int d_width; | |
| 37 int d_height; | |
| 38 int d_skip; | |
| 39 void *aux_data; | |
| 40 SDL_PixelFormat *src; | |
| 41 Uint8 *table; | |
| 42 SDL_PixelFormat *dst; | |
| 43 } SDL_BlitInfo; | |
| 44 | |
| 45 /* The type definition for the low level blit functions */ | |
| 46 typedef void (*SDL_loblit)(SDL_BlitInfo *info); | |
| 47 | |
| 48 /* This is the private info structure for software accelerated blits */ | |
| 49 struct private_swaccel { | |
| 50 SDL_loblit blit; | |
| 51 void *aux_data; | |
| 52 }; | |
| 53 | |
| 54 /* Blit mapping definition */ | |
| 55 typedef struct SDL_BlitMap { | |
| 56 SDL_Surface *dst; | |
| 57 int identity; | |
| 58 Uint8 *table; | |
| 59 SDL_blit hw_blit; | |
| 60 SDL_blit sw_blit; | |
| 61 struct private_hwaccel *hw_data; | |
| 62 struct private_swaccel *sw_data; | |
| 63 | |
| 64 /* the version count matches the destination; mismatch indicates | |
| 65 an invalid mapping */ | |
| 66 unsigned int format_version; | |
| 67 } SDL_BlitMap; | |
| 68 | |
| 69 | |
| 70 /* Functions found in SDL_blit.c */ | |
| 71 extern int SDL_CalculateBlit(SDL_Surface *surface); | |
| 72 | |
| 73 /* Functions found in SDL_blit_{0,1,N,A}.c */ | |
| 74 extern SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int complex); | |
| 75 extern SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int complex); | |
| 76 extern SDL_loblit SDL_CalculateBlitN(SDL_Surface *surface, int complex); | |
| 77 extern SDL_loblit SDL_CalculateAlphaBlit(SDL_Surface *surface, int complex); | |
| 78 | |
| 79 /* | |
| 80 * Useful macros for blitting routines | |
| 81 */ | |
| 82 | |
| 83 #define FORMAT_EQUAL(A, B) \ | |
| 84 ((A)->BitsPerPixel == (B)->BitsPerPixel \ | |
| 85 && ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask)) | |
| 86 | |
| 87 /* Load pixel of the specified format from a buffer and get its R-G-B values */ | |
| 88 /* FIXME: rescale values to 0..255 here? */ | |
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89 #define RGB_FROM_PIXEL(Pixel, fmt, r, g, b) \ |
| 0 | 90 { \ |
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91 r = (((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); \ |
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92 g = (((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); \ |
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93 b = (((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); \ |
| 0 | 94 } |
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95 #define RGB_FROM_RGB565(Pixel, r, g, b) \ |
| 0 | 96 { \ |
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97 r = (((Pixel&0xF800)>>11)<<3); \ |
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98 g = (((Pixel&0x07E0)>>5)<<2); \ |
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99 b = ((Pixel&0x001F)<<3); \ |
| 0 | 100 } |
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101 #define RGB_FROM_RGB555(Pixel, r, g, b) \ |
| 0 | 102 { \ |
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103 r = (((Pixel&0x7C00)>>10)<<3); \ |
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104 g = (((Pixel&0x03E0)>>5)<<3); \ |
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105 b = ((Pixel&0x001F)<<3); \ |
| 0 | 106 } |
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107 #define RGB_FROM_RGB888(Pixel, r, g, b) \ |
| 0 | 108 { \ |
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109 r = ((Pixel&0xFF0000)>>16); \ |
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110 g = ((Pixel&0xFF00)>>8); \ |
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111 b = (Pixel&0xFF); \ |
| 0 | 112 } |
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113 #define RETRIEVE_RGB_PIXEL(buf, bpp, Pixel) \ |
| 0 | 114 do { \ |
| 115 switch (bpp) { \ | |
| 116 case 2: \ | |
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117 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 118 break; \ |
| 119 \ | |
| 120 case 3: { \ | |
| 121 Uint8 *B = (Uint8 *)(buf); \ | |
| 122 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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123 Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ |
| 0 | 124 } else { \ |
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125 Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ |
| 0 | 126 } \ |
| 127 } \ | |
| 128 break; \ | |
| 129 \ | |
| 130 case 4: \ | |
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131 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 132 break; \ |
| 133 \ | |
| 134 default: \ | |
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135 Pixel = 0; /* appease gcc */ \ |
| 0 | 136 break; \ |
| 137 } \ | |
| 138 } while(0) | |
| 139 | |
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140 #define DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b) \ |
| 0 | 141 do { \ |
| 142 switch (bpp) { \ | |
| 143 case 2: \ | |
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144 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 145 break; \ |
| 146 \ | |
| 147 case 3: { \ | |
| 148 Uint8 *B = (Uint8 *)buf; \ | |
| 149 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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150 Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ |
| 0 | 151 } else { \ |
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152 Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ |
| 0 | 153 } \ |
| 154 } \ | |
| 155 break; \ | |
| 156 \ | |
| 157 case 4: \ | |
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158 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 159 break; \ |
| 160 \ | |
| 161 default: \ | |
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162 Pixel = 0; /* prevent gcc from complaining */ \ |
| 0 | 163 break; \ |
| 164 } \ | |
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165 RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \ |
| 0 | 166 } while(0) |
| 167 | |
| 168 /* Assemble R-G-B values into a specified pixel format and store them */ | |
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169 #ifdef __NDS__ // FIXME |
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170 #define PIXEL_FROM_RGB(Pixel, fmt, r, g, b) \ |
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171 { \ |
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172 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
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173 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
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174 ((b>>fmt->Bloss)<<fmt->Bshift) | (1<<15); \ |
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175 } |
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176 #else |
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177 #define PIXEL_FROM_RGB(Pixel, fmt, r, g, b) \ |
| 0 | 178 { \ |
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179 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
| 0 | 180 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
| 181 ((b>>fmt->Bloss)<<fmt->Bshift); \ | |
| 182 } | |
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183 #endif // __NDS__ FIXME |
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184 #define RGB565_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 185 { \ |
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186 Pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3); \ |
| 0 | 187 } |
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188 #define RGB555_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 189 { \ |
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190 Pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3); \ |
| 0 | 191 } |
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192 #define RGB888_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 193 { \ |
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194 Pixel = (r<<16)|(g<<8)|b; \ |
| 0 | 195 } |
| 196 #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \ | |
| 197 { \ | |
| 198 switch (bpp) { \ | |
| 199 case 2: { \ | |
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200 Uint16 Pixel; \ |
| 0 | 201 \ |
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202 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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203 *((Uint16 *)(buf)) = Pixel; \ |
| 0 | 204 } \ |
| 205 break; \ | |
| 206 \ | |
| 207 case 3: { \ | |
| 208 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 209 *((buf)+fmt->Rshift/8) = r; \ | |
| 210 *((buf)+fmt->Gshift/8) = g; \ | |
| 211 *((buf)+fmt->Bshift/8) = b; \ | |
| 212 } else { \ | |
| 213 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 214 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 215 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 216 } \ | |
| 217 } \ | |
| 218 break; \ | |
| 219 \ | |
| 220 case 4: { \ | |
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221 Uint32 Pixel; \ |
| 0 | 222 \ |
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223 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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224 *((Uint32 *)(buf)) = Pixel; \ |
| 0 | 225 } \ |
| 226 break; \ | |
| 227 } \ | |
| 228 } | |
| 229 #define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask) \ | |
| 230 { \ | |
| 231 switch (bpp) { \ | |
| 232 case 2: { \ | |
| 233 Uint16 *bufp; \ | |
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234 Uint16 Pixel; \ |
| 0 | 235 \ |
| 236 bufp = (Uint16 *)buf; \ | |
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237 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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238 *bufp = Pixel | (*bufp & Amask); \ |
| 0 | 239 } \ |
| 240 break; \ | |
| 241 \ | |
| 242 case 3: { \ | |
| 243 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 244 *((buf)+fmt->Rshift/8) = r; \ | |
| 245 *((buf)+fmt->Gshift/8) = g; \ | |
| 246 *((buf)+fmt->Bshift/8) = b; \ | |
| 247 } else { \ | |
| 248 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 249 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 250 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 251 } \ | |
| 252 } \ | |
| 253 break; \ | |
| 254 \ | |
| 255 case 4: { \ | |
| 256 Uint32 *bufp; \ | |
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257 Uint32 Pixel; \ |
| 0 | 258 \ |
| 259 bufp = (Uint32 *)buf; \ | |
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260 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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261 *bufp = Pixel | (*bufp & Amask); \ |
| 0 | 262 } \ |
| 263 break; \ | |
| 264 } \ | |
| 265 } | |
| 266 | |
| 267 /* FIXME: Should we rescale alpha into 0..255 here? */ | |
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268 #define RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a) \ |
| 0 | 269 { \ |
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270 r = ((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; \ |
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271 g = ((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; \ |
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272 b = ((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \ |
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273 a = ((Pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \ |
| 0 | 274 } |
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275 #define RGBA_FROM_8888(Pixel, fmt, r, g, b, a) \ |
| 0 | 276 { \ |
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277 r = (Pixel&fmt->Rmask)>>fmt->Rshift; \ |
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278 g = (Pixel&fmt->Gmask)>>fmt->Gshift; \ |
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279 b = (Pixel&fmt->Bmask)>>fmt->Bshift; \ |
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280 a = (Pixel&fmt->Amask)>>fmt->Ashift; \ |
| 0 | 281 } |
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282 #define RGBA_FROM_RGBA8888(Pixel, r, g, b, a) \ |
| 0 | 283 { \ |
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284 r = (Pixel>>24); \ |
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285 g = ((Pixel>>16)&0xFF); \ |
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286 b = ((Pixel>>8)&0xFF); \ |
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287 a = (Pixel&0xFF); \ |
| 0 | 288 } |
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289 #define RGBA_FROM_ARGB8888(Pixel, r, g, b, a) \ |
| 0 | 290 { \ |
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291 r = ((Pixel>>16)&0xFF); \ |
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292 g = ((Pixel>>8)&0xFF); \ |
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293 b = (Pixel&0xFF); \ |
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294 a = (Pixel>>24); \ |
| 0 | 295 } |
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296 #define RGBA_FROM_ABGR8888(Pixel, r, g, b, a) \ |
| 0 | 297 { \ |
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298 r = (Pixel&0xFF); \ |
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299 g = ((Pixel>>8)&0xFF); \ |
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300 b = ((Pixel>>16)&0xFF); \ |
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301 a = (Pixel>>24); \ |
| 0 | 302 } |
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303 #define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a) \ |
| 0 | 304 do { \ |
| 305 switch (bpp) { \ | |
| 306 case 2: \ | |
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307 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 308 break; \ |
| 309 \ | |
| 310 case 3: {/* FIXME: broken code (no alpha) */ \ | |
| 311 Uint8 *b = (Uint8 *)buf; \ | |
| 312 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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313 Pixel = b[0] + (b[1] << 8) + (b[2] << 16); \ |
| 0 | 314 } else { \ |
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315 Pixel = (b[0] << 16) + (b[1] << 8) + b[2]; \ |
| 0 | 316 } \ |
| 317 } \ | |
| 318 break; \ | |
| 319 \ | |
| 320 case 4: \ | |
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321 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 322 break; \ |
| 323 \ | |
| 324 default: \ | |
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325 Pixel = 0; /* stop gcc complaints */ \ |
| 0 | 326 break; \ |
| 327 } \ | |
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328 RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \ |
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329 Pixel &= ~fmt->Amask; \ |
| 0 | 330 } while(0) |
| 331 | |
| 332 /* FIXME: this isn't correct, especially for Alpha (maximum != 255) */ | |
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333 #ifdef __NDS__ // FIXME |
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334 #define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a) \ |
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335 { \ |
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336 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
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337 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
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338 ((b>>fmt->Bloss)<<fmt->Bshift)| \ |
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339 ((a>>fmt->Aloss)<<fmt->Ashift) | (1<<15); \ |
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340 } |
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341 #else |
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342 #define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a) \ |
| 0 | 343 { \ |
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344 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
| 0 | 345 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
| 346 ((b>>fmt->Bloss)<<fmt->Bshift)| \ | |
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347 ((a>>fmt->Aloss)<<fmt->Ashift); \ |
| 0 | 348 } |
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349 #endif // __NDS__ FIXME |
| 0 | 350 #define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \ |
| 351 { \ | |
| 352 switch (bpp) { \ | |
| 353 case 2: { \ | |
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354 Uint16 Pixel; \ |
| 0 | 355 \ |
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356 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \ |
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357 *((Uint16 *)(buf)) = Pixel; \ |
| 0 | 358 } \ |
| 359 break; \ | |
| 360 \ | |
| 361 case 3: { /* FIXME: broken code (no alpha) */ \ | |
| 362 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 363 *((buf)+fmt->Rshift/8) = r; \ | |
| 364 *((buf)+fmt->Gshift/8) = g; \ | |
| 365 *((buf)+fmt->Bshift/8) = b; \ | |
| 366 } else { \ | |
| 367 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 368 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 369 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 370 } \ | |
| 371 } \ | |
| 372 break; \ | |
| 373 \ | |
| 374 case 4: { \ | |
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375 Uint32 Pixel; \ |
| 0 | 376 \ |
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377 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \ |
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378 *((Uint32 *)(buf)) = Pixel; \ |
| 0 | 379 } \ |
| 380 break; \ | |
| 381 } \ | |
| 382 } | |
| 383 | |
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384 /* Blend the RGB values of two Pixels based on a source alpha value */ |
| 0 | 385 #define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \ |
| 386 do { \ | |
| 387 dR = (((sR-dR)*(A))>>8)+dR; \ | |
| 388 dG = (((sG-dG)*(A))>>8)+dG; \ | |
| 389 dB = (((sB-dB)*(A))>>8)+dB; \ | |
| 390 } while(0) | |
| 391 | |
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392 /* Blend the RGB values of two Pixels based on a source alpha value */ |
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393 #define ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB) \ |
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394 do { \ |
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395 unsigned tR, tG, tB, tA; \ |
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396 tA = 255 - sA; \ |
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397 tR = 1 + (sR * sA) + (dR * tA); \ |
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398 dR = (tR + (tR >> 8)) >> 8; \ |
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399 tG = 1 + (sG * sA) + (dG * tA); \ |
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400 dG = (tG + (tG >> 8)) >> 8; \ |
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401 tB = 1 + (sB * sA) + (dB * tA); \ |
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402 dB = (tB + (tB >> 8)) >> 8; \ |
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403 } while(0) |
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404 |
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405 |
| 0 | 406 /* This is a very useful loop for optimizing blitters */ |
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407 #if defined(_MSC_VER) && (_MSC_VER == 1300) |
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408 /* There's a bug in the Visual C++ 7 optimizer when compiling this code */ |
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409 #else |
| 0 | 410 #define USE_DUFFS_LOOP |
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411 #endif |
| 0 | 412 #ifdef USE_DUFFS_LOOP |
| 413 | |
| 414 /* 8-times unrolled loop */ | |
| 415 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 416 { int n = (width+7)/8; \ | |
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417 switch (width & 7) { \ |
| 0 | 418 case 0: do { pixel_copy_increment; \ |
| 419 case 7: pixel_copy_increment; \ | |
| 420 case 6: pixel_copy_increment; \ | |
| 421 case 5: pixel_copy_increment; \ | |
| 422 case 4: pixel_copy_increment; \ | |
| 423 case 3: pixel_copy_increment; \ | |
| 424 case 2: pixel_copy_increment; \ | |
| 425 case 1: pixel_copy_increment; \ | |
| 426 } while ( --n > 0 ); \ | |
| 427 } \ | |
| 428 } | |
| 429 | |
| 430 /* 4-times unrolled loop */ | |
| 431 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 432 { int n = (width+3)/4; \ | |
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433 switch (width & 3) { \ |
| 0 | 434 case 0: do { pixel_copy_increment; \ |
| 435 case 3: pixel_copy_increment; \ | |
| 436 case 2: pixel_copy_increment; \ | |
| 437 case 1: pixel_copy_increment; \ | |
| 438 } while ( --n > 0 ); \ | |
| 439 } \ | |
| 440 } | |
| 441 | |
|
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442 /* 2 - times unrolled loop */ |
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443 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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444 double_pixel_copy_increment, width) \ |
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445 { int n, w = width; \ |
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446 if( w & 1 ) { \ |
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447 pixel_copy_increment; \ |
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448 w--; \ |
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449 } \ |
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450 if ( w > 0 ) { \ |
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451 n = ( w + 2) / 4; \ |
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452 switch( w & 2 ) { \ |
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453 case 0: do { double_pixel_copy_increment; \ |
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454 case 2: double_pixel_copy_increment; \ |
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455 } while ( --n > 0 ); \ |
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456 } \ |
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457 } \ |
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458 } |
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459 |
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460 /* 2 - times unrolled loop 4 pixels */ |
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461 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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462 double_pixel_copy_increment, \ |
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463 quatro_pixel_copy_increment, width) \ |
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464 { int n, w = width; \ |
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465 if(w & 1) { \ |
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466 pixel_copy_increment; \ |
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467 w--; \ |
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468 } \ |
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469 if(w & 2) { \ |
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470 double_pixel_copy_increment; \ |
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471 w -= 2; \ |
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472 } \ |
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473 if ( w > 0 ) { \ |
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474 n = ( w + 7 ) / 8; \ |
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475 switch( w & 4 ) { \ |
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476 case 0: do { quatro_pixel_copy_increment; \ |
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477 case 4: quatro_pixel_copy_increment; \ |
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478 } while ( --n > 0 ); \ |
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479 } \ |
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480 } \ |
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481 } |
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482 |
| 0 | 483 /* Use the 8-times version of the loop by default */ |
| 484 #define DUFFS_LOOP(pixel_copy_increment, width) \ | |
| 485 DUFFS_LOOP8(pixel_copy_increment, width) | |
| 486 | |
| 487 #else | |
| 488 | |
| 489 /* Don't use Duff's device to unroll loops */ | |
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689
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490 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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491 double_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 n=n>>1; \ |
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498 for(; n > 0; --n) { \ |
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499 double_pixel_copy_increment; \ |
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500 } \ |
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501 } |
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502 |
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503 /* Don't use Duff's device to unroll loops */ |
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504 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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505 double_pixel_copy_increment, \ |
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506 quatro_pixel_copy_increment, width) \ |
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507 { int n = width; \ |
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508 if(n & 1) { \ |
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509 pixel_copy_increment; \ |
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510 n--; \ |
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511 } \ |
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512 if(n & 2) { \ |
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513 double_pixel_copy_increment; \ |
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514 n -= 2; \ |
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515 } \ |
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516 n=n>>2; \ |
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517 for(; n > 0; --n) { \ |
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518 quatro_pixel_copy_increment; \ |
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519 } \ |
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520 } |
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521 |
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522 /* Don't use Duff's device to unroll loops */ |
| 0 | 523 #define DUFFS_LOOP(pixel_copy_increment, width) \ |
| 524 { int n; \ | |
| 525 for ( n=width; n > 0; --n ) { \ | |
| 526 pixel_copy_increment; \ | |
| 527 } \ | |
| 528 } | |
| 529 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 530 DUFFS_LOOP(pixel_copy_increment, width) | |
| 531 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 532 DUFFS_LOOP(pixel_copy_increment, width) | |
| 533 | |
| 534 #endif /* USE_DUFFS_LOOP */ | |
| 535 | |
| 536 /* Prevent Visual C++ 6.0 from printing out stupid warnings */ | |
| 537 #if defined(_MSC_VER) && (_MSC_VER >= 600) | |
| 538 #pragma warning(disable: 4550) | |
| 539 #endif | |
| 540 | |
| 541 #endif /* _SDL_blit_h */ |