Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.h @ 2247:93994f65c74c
Removed hermes since it's LGPL and not compatible with a commercial license.
Prepping for using MMX and SSE intrinsics instead of inline assembly.
.. except for memcpy equivalents which only get faster if they can
exploit the parallelism of loading into multiple SIMD registers. :)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 15 Aug 2007 08:21:10 +0000 |
| parents | c121d94672cb |
| children | 5a58b57b6724 |
| 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 */ | |
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30 typedef struct |
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31 { |
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32 Uint8 *s_pixels; |
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33 int s_width; |
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34 int s_height; |
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35 int s_skip; |
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36 Uint8 *d_pixels; |
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37 int d_width; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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38 int d_height; |
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39 int d_skip; |
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40 void *aux_data; |
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41 SDL_PixelFormat *src; |
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42 Uint8 *table; |
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43 SDL_PixelFormat *dst; |
| 0 | 44 } SDL_BlitInfo; |
| 45 | |
| 46 /* The type definition for the low level blit functions */ | |
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47 typedef void (*SDL_loblit) (SDL_BlitInfo * info); |
| 0 | 48 |
| 49 /* This is the private info structure for software accelerated blits */ | |
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50 struct private_swaccel |
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51 { |
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52 SDL_loblit blit; |
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53 void *aux_data; |
| 0 | 54 }; |
| 55 | |
| 56 /* Blit mapping definition */ | |
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57 typedef struct SDL_BlitMap |
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58 { |
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59 SDL_Surface *dst; |
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60 int identity; |
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61 Uint8 *table; |
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62 SDL_blit sw_blit; |
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63 struct private_swaccel *sw_data; |
| 0 | 64 |
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65 /* the version count matches the destination; mismatch indicates |
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66 an invalid mapping */ |
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67 unsigned int format_version; |
| 0 | 68 } SDL_BlitMap; |
| 69 | |
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70 #define SDL_BLIT_ANY 0x00000000 |
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71 #define SDL_BLIT_MMX 0x00000001 |
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72 #define SDL_BLIT_SSE 0x00000002 |
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73 #define SDL_BLIT_ALTIVEC_PREFETCH 0x00000004 |
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74 #define SDL_BLIT_ALTIVEC_NOPREFETCH 0x00000008 |
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75 |
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76 typedef struct SDL_BlitEntry |
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77 { |
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78 Uint32 features; |
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79 SDL_loblit blit; |
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80 } SDL_BlitEntry; |
| 0 | 81 |
| 82 /* Functions found in SDL_blit.c */ | |
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83 extern int SDL_CalculateBlit(SDL_Surface * surface); |
| 0 | 84 |
| 85 /* Functions found in SDL_blit_{0,1,N,A}.c */ | |
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86 extern SDL_loblit SDL_CalculateBlit0(SDL_Surface * surface, int complex); |
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87 extern SDL_loblit SDL_CalculateBlit1(SDL_Surface * surface, int complex); |
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88 extern SDL_loblit SDL_CalculateBlitN(SDL_Surface * surface, int complex); |
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89 extern SDL_loblit SDL_CalculateAlphaBlit(SDL_Surface * surface, int complex); |
| 0 | 90 |
| 91 /* | |
| 92 * Useful macros for blitting routines | |
| 93 */ | |
| 94 | |
| 95 #define FORMAT_EQUAL(A, B) \ | |
| 96 ((A)->BitsPerPixel == (B)->BitsPerPixel \ | |
| 97 && ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask)) | |
| 98 | |
| 99 /* Load pixel of the specified format from a buffer and get its R-G-B values */ | |
| 100 /* FIXME: rescale values to 0..255 here? */ | |
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101 #define RGB_FROM_PIXEL(Pixel, fmt, r, g, b) \ |
| 0 | 102 { \ |
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103 r = (((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); \ |
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104 g = (((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); \ |
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105 b = (((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); \ |
| 0 | 106 } |
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107 #define RGB_FROM_RGB565(Pixel, r, g, b) \ |
| 0 | 108 { \ |
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109 r = (((Pixel&0xF800)>>11)<<3); \ |
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110 g = (((Pixel&0x07E0)>>5)<<2); \ |
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111 b = ((Pixel&0x001F)<<3); \ |
| 0 | 112 } |
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113 #define RGB_FROM_RGB555(Pixel, r, g, b) \ |
| 0 | 114 { \ |
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115 r = (((Pixel&0x7C00)>>10)<<3); \ |
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116 g = (((Pixel&0x03E0)>>5)<<3); \ |
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117 b = ((Pixel&0x001F)<<3); \ |
| 0 | 118 } |
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119 #define RGB_FROM_RGB888(Pixel, r, g, b) \ |
| 0 | 120 { \ |
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121 r = ((Pixel&0xFF0000)>>16); \ |
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122 g = ((Pixel&0xFF00)>>8); \ |
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123 b = (Pixel&0xFF); \ |
| 0 | 124 } |
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125 #define RETRIEVE_RGB_PIXEL(buf, bpp, Pixel) \ |
| 0 | 126 do { \ |
| 127 switch (bpp) { \ | |
| 128 case 2: \ | |
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129 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 130 break; \ |
| 131 \ | |
| 132 case 3: { \ | |
| 133 Uint8 *B = (Uint8 *)(buf); \ | |
| 134 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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135 Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ |
| 0 | 136 } else { \ |
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137 Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ |
| 0 | 138 } \ |
| 139 } \ | |
| 140 break; \ | |
| 141 \ | |
| 142 case 4: \ | |
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143 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 144 break; \ |
| 145 \ | |
| 146 default: \ | |
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147 Pixel = 0; /* appease gcc */ \ |
| 0 | 148 break; \ |
| 149 } \ | |
| 150 } while(0) | |
| 151 | |
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152 #define DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b) \ |
| 0 | 153 do { \ |
| 154 switch (bpp) { \ | |
| 155 case 2: \ | |
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156 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 157 break; \ |
| 158 \ | |
| 159 case 3: { \ | |
| 160 Uint8 *B = (Uint8 *)buf; \ | |
| 161 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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162 Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ |
| 0 | 163 } else { \ |
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164 Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ |
| 0 | 165 } \ |
| 166 } \ | |
| 167 break; \ | |
| 168 \ | |
| 169 case 4: \ | |
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170 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 171 break; \ |
| 172 \ | |
| 173 default: \ | |
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174 Pixel = 0; /* prevent gcc from complaining */ \ |
| 0 | 175 break; \ |
| 176 } \ | |
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177 RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \ |
| 0 | 178 } while(0) |
| 179 | |
| 180 /* Assemble R-G-B values into a specified pixel format and store them */ | |
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181 #define PIXEL_FROM_RGB(Pixel, fmt, r, g, b) \ |
| 0 | 182 { \ |
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183 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
| 0 | 184 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
| 185 ((b>>fmt->Bloss)<<fmt->Bshift); \ | |
| 186 } | |
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187 #define RGB565_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 188 { \ |
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189 Pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3); \ |
| 0 | 190 } |
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191 #define RGB555_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 192 { \ |
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193 Pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3); \ |
| 0 | 194 } |
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195 #define RGB888_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 196 { \ |
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197 Pixel = (r<<16)|(g<<8)|b; \ |
| 0 | 198 } |
| 199 #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \ | |
| 200 { \ | |
| 201 switch (bpp) { \ | |
| 202 case 2: { \ | |
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203 Uint16 Pixel; \ |
| 0 | 204 \ |
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205 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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206 *((Uint16 *)(buf)) = Pixel; \ |
| 0 | 207 } \ |
| 208 break; \ | |
| 209 \ | |
| 210 case 3: { \ | |
| 211 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 212 *((buf)+fmt->Rshift/8) = r; \ | |
| 213 *((buf)+fmt->Gshift/8) = g; \ | |
| 214 *((buf)+fmt->Bshift/8) = b; \ | |
| 215 } else { \ | |
| 216 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 217 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 218 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 219 } \ | |
| 220 } \ | |
| 221 break; \ | |
| 222 \ | |
| 223 case 4: { \ | |
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224 Uint32 Pixel; \ |
| 0 | 225 \ |
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226 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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227 *((Uint32 *)(buf)) = Pixel; \ |
| 0 | 228 } \ |
| 229 break; \ | |
| 230 } \ | |
| 231 } | |
| 232 #define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask) \ | |
| 233 { \ | |
| 234 switch (bpp) { \ | |
| 235 case 2: { \ | |
| 236 Uint16 *bufp; \ | |
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237 Uint16 Pixel; \ |
| 0 | 238 \ |
| 239 bufp = (Uint16 *)buf; \ | |
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240 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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241 *bufp = Pixel | (*bufp & Amask); \ |
| 0 | 242 } \ |
| 243 break; \ | |
| 244 \ | |
| 245 case 3: { \ | |
| 246 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 247 *((buf)+fmt->Rshift/8) = r; \ | |
| 248 *((buf)+fmt->Gshift/8) = g; \ | |
| 249 *((buf)+fmt->Bshift/8) = b; \ | |
| 250 } else { \ | |
| 251 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 252 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 253 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 254 } \ | |
| 255 } \ | |
| 256 break; \ | |
| 257 \ | |
| 258 case 4: { \ | |
| 259 Uint32 *bufp; \ | |
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260 Uint32 Pixel; \ |
| 0 | 261 \ |
| 262 bufp = (Uint32 *)buf; \ | |
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263 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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264 *bufp = Pixel | (*bufp & Amask); \ |
| 0 | 265 } \ |
| 266 break; \ | |
| 267 } \ | |
| 268 } | |
| 269 | |
| 270 /* FIXME: Should we rescale alpha into 0..255 here? */ | |
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271 #define RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a) \ |
| 0 | 272 { \ |
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273 r = ((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; \ |
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274 g = ((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; \ |
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275 b = ((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \ |
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276 a = ((Pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \ |
| 0 | 277 } |
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278 #define RGBA_FROM_8888(Pixel, fmt, r, g, b, a) \ |
| 0 | 279 { \ |
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280 r = (Pixel&fmt->Rmask)>>fmt->Rshift; \ |
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281 g = (Pixel&fmt->Gmask)>>fmt->Gshift; \ |
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282 b = (Pixel&fmt->Bmask)>>fmt->Bshift; \ |
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283 a = (Pixel&fmt->Amask)>>fmt->Ashift; \ |
| 0 | 284 } |
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285 #define RGBA_FROM_RGBA8888(Pixel, r, g, b, a) \ |
| 0 | 286 { \ |
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287 r = (Pixel>>24); \ |
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288 g = ((Pixel>>16)&0xFF); \ |
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289 b = ((Pixel>>8)&0xFF); \ |
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290 a = (Pixel&0xFF); \ |
| 0 | 291 } |
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292 #define RGBA_FROM_ARGB8888(Pixel, r, g, b, a) \ |
| 0 | 293 { \ |
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294 r = ((Pixel>>16)&0xFF); \ |
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295 g = ((Pixel>>8)&0xFF); \ |
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296 b = (Pixel&0xFF); \ |
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297 a = (Pixel>>24); \ |
| 0 | 298 } |
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299 #define RGBA_FROM_ABGR8888(Pixel, r, g, b, a) \ |
| 0 | 300 { \ |
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301 r = (Pixel&0xFF); \ |
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302 g = ((Pixel>>8)&0xFF); \ |
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303 b = ((Pixel>>16)&0xFF); \ |
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304 a = (Pixel>>24); \ |
| 0 | 305 } |
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306 #define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a) \ |
| 0 | 307 do { \ |
| 308 switch (bpp) { \ | |
| 309 case 2: \ | |
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310 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 311 break; \ |
| 312 \ | |
| 313 case 3: {/* FIXME: broken code (no alpha) */ \ | |
| 314 Uint8 *b = (Uint8 *)buf; \ | |
| 315 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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316 Pixel = b[0] + (b[1] << 8) + (b[2] << 16); \ |
| 0 | 317 } else { \ |
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318 Pixel = (b[0] << 16) + (b[1] << 8) + b[2]; \ |
| 0 | 319 } \ |
| 320 } \ | |
| 321 break; \ | |
| 322 \ | |
| 323 case 4: \ | |
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324 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 325 break; \ |
| 326 \ | |
| 327 default: \ | |
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328 Pixel = 0; /* stop gcc complaints */ \ |
| 0 | 329 break; \ |
| 330 } \ | |
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331 RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \ |
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332 Pixel &= ~fmt->Amask; \ |
| 0 | 333 } while(0) |
| 334 | |
| 335 /* FIXME: this isn't correct, especially for Alpha (maximum != 255) */ | |
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336 #define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a) \ |
| 0 | 337 { \ |
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338 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
| 0 | 339 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
| 340 ((b>>fmt->Bloss)<<fmt->Bshift)| \ | |
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341 ((a>>fmt->Aloss)<<fmt->Ashift); \ |
| 0 | 342 } |
| 343 #define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \ | |
| 344 { \ | |
| 345 switch (bpp) { \ | |
| 346 case 2: { \ | |
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347 Uint16 Pixel; \ |
| 0 | 348 \ |
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349 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \ |
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350 *((Uint16 *)(buf)) = Pixel; \ |
| 0 | 351 } \ |
| 352 break; \ | |
| 353 \ | |
| 354 case 3: { /* FIXME: broken code (no alpha) */ \ | |
| 355 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 356 *((buf)+fmt->Rshift/8) = r; \ | |
| 357 *((buf)+fmt->Gshift/8) = g; \ | |
| 358 *((buf)+fmt->Bshift/8) = b; \ | |
| 359 } else { \ | |
| 360 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 361 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 362 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 363 } \ | |
| 364 } \ | |
| 365 break; \ | |
| 366 \ | |
| 367 case 4: { \ | |
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368 Uint32 Pixel; \ |
| 0 | 369 \ |
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370 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \ |
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371 *((Uint32 *)(buf)) = Pixel; \ |
| 0 | 372 } \ |
| 373 break; \ | |
| 374 } \ | |
| 375 } | |
| 376 | |
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377 /* Blend the RGB values of two Pixels based on a source alpha value */ |
| 0 | 378 #define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \ |
| 379 do { \ | |
| 380 dR = (((sR-dR)*(A))>>8)+dR; \ | |
| 381 dG = (((sG-dG)*(A))>>8)+dG; \ | |
| 382 dB = (((sB-dB)*(A))>>8)+dB; \ | |
| 383 } while(0) | |
| 384 | |
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385 /* Blend the RGB values of two Pixels based on a source alpha value */ |
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386 #define ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB) \ |
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387 do { \ |
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388 unsigned tR, tG, tB, tA; \ |
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389 tA = 255 - sA; \ |
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390 tR = 1 + (sR * sA) + (dR * tA); \ |
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391 dR = (tR + (tR >> 8)) >> 8; \ |
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392 tG = 1 + (sG * sA) + (dG * tA); \ |
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393 dG = (tG + (tG >> 8)) >> 8; \ |
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394 tB = 1 + (sB * sA) + (dB * tA); \ |
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395 dB = (tB + (tB >> 8)) >> 8; \ |
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396 } while(0) |
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Altivec-optimized blitters!
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397 |
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398 |
| 0 | 399 /* This is a very useful loop for optimizing blitters */ |
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400 #if defined(_MSC_VER) && (_MSC_VER == 1300) |
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401 /* There's a bug in the Visual C++ 7 optimizer when compiling this code */ |
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402 #else |
| 0 | 403 #define USE_DUFFS_LOOP |
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404 #endif |
| 0 | 405 #ifdef USE_DUFFS_LOOP |
| 406 | |
| 407 /* 8-times unrolled loop */ | |
| 408 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 409 { int n = (width+7)/8; \ | |
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410 switch (width & 7) { \ |
| 0 | 411 case 0: do { pixel_copy_increment; \ |
| 412 case 7: pixel_copy_increment; \ | |
| 413 case 6: pixel_copy_increment; \ | |
| 414 case 5: pixel_copy_increment; \ | |
| 415 case 4: pixel_copy_increment; \ | |
| 416 case 3: pixel_copy_increment; \ | |
| 417 case 2: pixel_copy_increment; \ | |
| 418 case 1: pixel_copy_increment; \ | |
| 419 } while ( --n > 0 ); \ | |
| 420 } \ | |
| 421 } | |
| 422 | |
| 423 /* 4-times unrolled loop */ | |
| 424 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 425 { int n = (width+3)/4; \ | |
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426 switch (width & 3) { \ |
| 0 | 427 case 0: do { pixel_copy_increment; \ |
| 428 case 3: pixel_copy_increment; \ | |
| 429 case 2: pixel_copy_increment; \ | |
| 430 case 1: pixel_copy_increment; \ | |
| 431 } while ( --n > 0 ); \ | |
| 432 } \ | |
| 433 } | |
| 434 | |
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435 /* 2 - times unrolled loop */ |
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436 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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437 double_pixel_copy_increment, width) \ |
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438 { int n, w = width; \ |
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439 if( w & 1 ) { \ |
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440 pixel_copy_increment; \ |
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441 w--; \ |
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442 } \ |
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443 if ( w > 0 ) { \ |
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444 n = ( w + 2) / 4; \ |
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445 switch( w & 2 ) { \ |
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446 case 0: do { double_pixel_copy_increment; \ |
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447 case 2: double_pixel_copy_increment; \ |
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448 } while ( --n > 0 ); \ |
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449 } \ |
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450 } \ |
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451 } |
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452 |
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453 /* 2 - times unrolled loop 4 pixels */ |
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454 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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455 double_pixel_copy_increment, \ |
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456 quatro_pixel_copy_increment, width) \ |
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457 { int n, w = width; \ |
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458 if(w & 1) { \ |
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459 pixel_copy_increment; \ |
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460 w--; \ |
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461 } \ |
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462 if(w & 2) { \ |
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463 double_pixel_copy_increment; \ |
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464 w -= 2; \ |
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465 } \ |
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466 if ( w > 0 ) { \ |
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467 n = ( w + 7 ) / 8; \ |
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468 switch( w & 4 ) { \ |
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469 case 0: do { quatro_pixel_copy_increment; \ |
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470 case 4: quatro_pixel_copy_increment; \ |
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471 } while ( --n > 0 ); \ |
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472 } \ |
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473 } \ |
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474 } |
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475 |
| 0 | 476 /* Use the 8-times version of the loop by default */ |
| 477 #define DUFFS_LOOP(pixel_copy_increment, width) \ | |
| 478 DUFFS_LOOP8(pixel_copy_increment, width) | |
| 479 | |
| 480 #else | |
| 481 | |
| 482 /* Don't use Duff's device to unroll loops */ | |
|
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483 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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484 double_pixel_copy_increment, width) \ |
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485 { int n = width; \ |
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486 if( n & 1 ) { \ |
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487 pixel_copy_increment; \ |
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488 n--; \ |
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489 } \ |
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490 n=n>>1; \ |
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491 for(; n > 0; --n) { \ |
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492 double_pixel_copy_increment; \ |
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493 } \ |
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494 } |
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495 |
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496 /* Don't use Duff's device to unroll loops */ |
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497 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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498 double_pixel_copy_increment, \ |
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499 quatro_pixel_copy_increment, width) \ |
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500 { int n = width; \ |
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501 if(n & 1) { \ |
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502 pixel_copy_increment; \ |
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503 n--; \ |
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504 } \ |
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505 if(n & 2) { \ |
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506 double_pixel_copy_increment; \ |
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507 n -= 2; \ |
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508 } \ |
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509 n=n>>2; \ |
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510 for(; n > 0; --n) { \ |
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511 quatro_pixel_copy_increment; \ |
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512 } \ |
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513 } |
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514 |
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515 /* Don't use Duff's device to unroll loops */ |
| 0 | 516 #define DUFFS_LOOP(pixel_copy_increment, width) \ |
| 517 { int n; \ | |
| 518 for ( n=width; n > 0; --n ) { \ | |
| 519 pixel_copy_increment; \ | |
| 520 } \ | |
| 521 } | |
| 522 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 523 DUFFS_LOOP(pixel_copy_increment, width) | |
| 524 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 525 DUFFS_LOOP(pixel_copy_increment, width) | |
| 526 | |
| 527 #endif /* USE_DUFFS_LOOP */ | |
| 528 | |
| 529 /* Prevent Visual C++ 6.0 from printing out stupid warnings */ | |
| 530 #if defined(_MSC_VER) && (_MSC_VER >= 600) | |
| 531 #pragma warning(disable: 4550) | |
| 532 #endif | |
| 533 | |
| 534 #endif /* _SDL_blit_h */ | |
|
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535 /* vi: set ts=4 sw=4 expandtab: */ |