Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.h @ 2257:340942cfda48
Moved the colorkey and per-surface alpha into the blit info,
in preparation for support for general color channel modulation.
Removed and consolidated some data in the blit info.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 17 Aug 2007 00:54:53 +0000 |
| parents | 292bee385630 |
| children | 202ddfd1cfb1 |
| 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 | |
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27 #ifdef __MMX__ |
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28 #include <mmintrin.h> |
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29 #endif |
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30 #ifdef __SSE__ |
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31 #include <xmmintrin.h> |
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32 #endif |
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33 |
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34 #include "SDL_cpuinfo.h" |
| 0 | 35 #include "SDL_endian.h" |
| 36 | |
| 37 /* The structure passed to the low level blit functions */ | |
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38 typedef struct |
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39 { |
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40 Uint8 *s_pixels; |
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41 int s_width; |
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42 int s_height; |
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43 int s_skip; |
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44 Uint8 *d_pixels; |
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45 int d_width; |
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46 int d_height; |
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47 int d_skip; |
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48 SDL_PixelFormat *src; |
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49 Uint8 *table; |
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50 SDL_PixelFormat *dst; |
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51 Uint32 ckey, cmod; |
| 0 | 52 } SDL_BlitInfo; |
| 53 | |
| 54 /* The type definition for the low level blit functions */ | |
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55 typedef void (*SDL_loblit) (SDL_BlitInfo * info); |
| 0 | 56 |
| 57 /* Blit mapping definition */ | |
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58 typedef struct SDL_BlitMap |
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59 { |
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60 SDL_Surface *dst; |
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61 int identity; |
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62 Uint8 *table; |
|
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63 SDL_blit blit; |
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64 void *data; |
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65 Uint32 ckey; /* colorkey */ |
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66 Uint32 cmod; /* ARGB modulation */ |
| 0 | 67 |
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68 /* the version count matches the destination; mismatch indicates |
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69 an invalid mapping */ |
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70 unsigned int format_version; |
| 0 | 71 } SDL_BlitMap; |
| 72 | |
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73 #define SDL_BLIT_ANY 0x00000000 |
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74 #define SDL_BLIT_MMX 0x00000001 |
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75 #define SDL_BLIT_SSE 0x00000002 |
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76 #define SDL_BLIT_ALTIVEC_PREFETCH 0x00000004 |
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77 #define SDL_BLIT_ALTIVEC_NOPREFETCH 0x00000008 |
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78 |
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79 typedef struct SDL_BlitEntry |
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80 { |
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81 Uint32 features; |
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82 SDL_loblit blit; |
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83 } SDL_BlitEntry; |
| 0 | 84 |
| 85 /* Functions found in SDL_blit.c */ | |
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86 extern int SDL_CalculateBlit(SDL_Surface * surface); |
| 0 | 87 |
| 88 /* Functions found in SDL_blit_{0,1,N,A}.c */ | |
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89 extern SDL_loblit SDL_CalculateBlit0(SDL_Surface * surface, int complex); |
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90 extern SDL_loblit SDL_CalculateBlit1(SDL_Surface * surface, int complex); |
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91 extern SDL_loblit SDL_CalculateBlitN(SDL_Surface * surface, int complex); |
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92 extern SDL_loblit SDL_CalculateAlphaBlit(SDL_Surface * surface, int complex); |
| 0 | 93 |
| 94 /* | |
| 95 * Useful macros for blitting routines | |
| 96 */ | |
| 97 | |
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98 #if defined(__GNUC__) |
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99 #define DECLARE_ALIGNED(t,v,a) t __attribute__((aligned(a))) v |
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100 #elif defined(_MSC_VER) |
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101 #define DECLARE_ALIGNED(t,v,a) __declspec(align(a)) t v |
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102 #else |
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103 #define DECLARE_ALIGNED(t,v,a) t v |
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104 #endif |
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105 |
| 0 | 106 #define FORMAT_EQUAL(A, B) \ |
| 107 ((A)->BitsPerPixel == (B)->BitsPerPixel \ | |
| 108 && ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask)) | |
| 109 | |
| 110 /* Load pixel of the specified format from a buffer and get its R-G-B values */ | |
| 111 /* FIXME: rescale values to 0..255 here? */ | |
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112 #define RGB_FROM_PIXEL(Pixel, fmt, r, g, b) \ |
| 0 | 113 { \ |
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114 r = (((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); \ |
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115 g = (((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); \ |
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116 b = (((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); \ |
| 0 | 117 } |
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118 #define RGB_FROM_RGB565(Pixel, r, g, b) \ |
| 0 | 119 { \ |
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120 r = (((Pixel&0xF800)>>11)<<3); \ |
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121 g = (((Pixel&0x07E0)>>5)<<2); \ |
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122 b = ((Pixel&0x001F)<<3); \ |
| 0 | 123 } |
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124 #define RGB_FROM_RGB555(Pixel, r, g, b) \ |
| 0 | 125 { \ |
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126 r = (((Pixel&0x7C00)>>10)<<3); \ |
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127 g = (((Pixel&0x03E0)>>5)<<3); \ |
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128 b = ((Pixel&0x001F)<<3); \ |
| 0 | 129 } |
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130 #define RGB_FROM_RGB888(Pixel, r, g, b) \ |
| 0 | 131 { \ |
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132 r = ((Pixel&0xFF0000)>>16); \ |
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133 g = ((Pixel&0xFF00)>>8); \ |
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134 b = (Pixel&0xFF); \ |
| 0 | 135 } |
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136 #define RETRIEVE_RGB_PIXEL(buf, bpp, Pixel) \ |
| 0 | 137 do { \ |
| 138 switch (bpp) { \ | |
| 139 case 2: \ | |
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140 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 141 break; \ |
| 142 \ | |
| 143 case 3: { \ | |
| 144 Uint8 *B = (Uint8 *)(buf); \ | |
| 145 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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146 Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ |
| 0 | 147 } else { \ |
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148 Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ |
| 0 | 149 } \ |
| 150 } \ | |
| 151 break; \ | |
| 152 \ | |
| 153 case 4: \ | |
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154 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 155 break; \ |
| 156 \ | |
| 157 default: \ | |
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158 Pixel = 0; /* appease gcc */ \ |
| 0 | 159 break; \ |
| 160 } \ | |
| 161 } while(0) | |
| 162 | |
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163 #define DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b) \ |
| 0 | 164 do { \ |
| 165 switch (bpp) { \ | |
| 166 case 2: \ | |
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167 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 168 break; \ |
| 169 \ | |
| 170 case 3: { \ | |
| 171 Uint8 *B = (Uint8 *)buf; \ | |
| 172 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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173 Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ |
| 0 | 174 } else { \ |
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175 Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ |
| 0 | 176 } \ |
| 177 } \ | |
| 178 break; \ | |
| 179 \ | |
| 180 case 4: \ | |
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181 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 182 break; \ |
| 183 \ | |
| 184 default: \ | |
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185 Pixel = 0; /* prevent gcc from complaining */ \ |
| 0 | 186 break; \ |
| 187 } \ | |
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188 RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \ |
| 0 | 189 } while(0) |
| 190 | |
| 191 /* Assemble R-G-B values into a specified pixel format and store them */ | |
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192 #define PIXEL_FROM_RGB(Pixel, fmt, r, g, b) \ |
| 0 | 193 { \ |
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194 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
| 0 | 195 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
| 196 ((b>>fmt->Bloss)<<fmt->Bshift); \ | |
| 197 } | |
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198 #define RGB565_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 199 { \ |
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200 Pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3); \ |
| 0 | 201 } |
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202 #define RGB555_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 203 { \ |
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204 Pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3); \ |
| 0 | 205 } |
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206 #define RGB888_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 207 { \ |
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208 Pixel = (r<<16)|(g<<8)|b; \ |
| 0 | 209 } |
| 210 #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \ | |
| 211 { \ | |
| 212 switch (bpp) { \ | |
| 213 case 2: { \ | |
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214 Uint16 Pixel; \ |
| 0 | 215 \ |
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216 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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217 *((Uint16 *)(buf)) = Pixel; \ |
| 0 | 218 } \ |
| 219 break; \ | |
| 220 \ | |
| 221 case 3: { \ | |
| 222 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 223 *((buf)+fmt->Rshift/8) = r; \ | |
| 224 *((buf)+fmt->Gshift/8) = g; \ | |
| 225 *((buf)+fmt->Bshift/8) = b; \ | |
| 226 } else { \ | |
| 227 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 228 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 229 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 230 } \ | |
| 231 } \ | |
| 232 break; \ | |
| 233 \ | |
| 234 case 4: { \ | |
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235 Uint32 Pixel; \ |
| 0 | 236 \ |
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237 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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238 *((Uint32 *)(buf)) = Pixel; \ |
| 0 | 239 } \ |
| 240 break; \ | |
| 241 } \ | |
| 242 } | |
| 243 #define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask) \ | |
| 244 { \ | |
| 245 switch (bpp) { \ | |
| 246 case 2: { \ | |
| 247 Uint16 *bufp; \ | |
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248 Uint16 Pixel; \ |
| 0 | 249 \ |
| 250 bufp = (Uint16 *)buf; \ | |
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251 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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252 *bufp = Pixel | (*bufp & Amask); \ |
| 0 | 253 } \ |
| 254 break; \ | |
| 255 \ | |
| 256 case 3: { \ | |
| 257 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 258 *((buf)+fmt->Rshift/8) = r; \ | |
| 259 *((buf)+fmt->Gshift/8) = g; \ | |
| 260 *((buf)+fmt->Bshift/8) = b; \ | |
| 261 } else { \ | |
| 262 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 263 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 264 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 265 } \ | |
| 266 } \ | |
| 267 break; \ | |
| 268 \ | |
| 269 case 4: { \ | |
| 270 Uint32 *bufp; \ | |
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271 Uint32 Pixel; \ |
| 0 | 272 \ |
| 273 bufp = (Uint32 *)buf; \ | |
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274 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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275 *bufp = Pixel | (*bufp & Amask); \ |
| 0 | 276 } \ |
| 277 break; \ | |
| 278 } \ | |
| 279 } | |
| 280 | |
| 281 /* FIXME: Should we rescale alpha into 0..255 here? */ | |
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282 #define RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a) \ |
| 0 | 283 { \ |
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284 r = ((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; \ |
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285 g = ((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; \ |
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286 b = ((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \ |
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287 a = ((Pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \ |
| 0 | 288 } |
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289 #define RGBA_FROM_8888(Pixel, fmt, r, g, b, a) \ |
| 0 | 290 { \ |
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291 r = (Pixel&fmt->Rmask)>>fmt->Rshift; \ |
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292 g = (Pixel&fmt->Gmask)>>fmt->Gshift; \ |
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293 b = (Pixel&fmt->Bmask)>>fmt->Bshift; \ |
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294 a = (Pixel&fmt->Amask)>>fmt->Ashift; \ |
| 0 | 295 } |
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296 #define RGBA_FROM_RGBA8888(Pixel, r, g, b, a) \ |
| 0 | 297 { \ |
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298 r = (Pixel>>24); \ |
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299 g = ((Pixel>>16)&0xFF); \ |
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300 b = ((Pixel>>8)&0xFF); \ |
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301 a = (Pixel&0xFF); \ |
| 0 | 302 } |
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303 #define RGBA_FROM_ARGB8888(Pixel, r, g, b, a) \ |
| 0 | 304 { \ |
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305 r = ((Pixel>>16)&0xFF); \ |
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306 g = ((Pixel>>8)&0xFF); \ |
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307 b = (Pixel&0xFF); \ |
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308 a = (Pixel>>24); \ |
| 0 | 309 } |
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310 #define RGBA_FROM_ABGR8888(Pixel, r, g, b, a) \ |
| 0 | 311 { \ |
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312 r = (Pixel&0xFF); \ |
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313 g = ((Pixel>>8)&0xFF); \ |
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314 b = ((Pixel>>16)&0xFF); \ |
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315 a = (Pixel>>24); \ |
| 0 | 316 } |
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317 #define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a) \ |
| 0 | 318 do { \ |
| 319 switch (bpp) { \ | |
| 320 case 2: \ | |
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321 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 322 break; \ |
| 323 \ | |
| 324 case 3: {/* FIXME: broken code (no alpha) */ \ | |
| 325 Uint8 *b = (Uint8 *)buf; \ | |
| 326 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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327 Pixel = b[0] + (b[1] << 8) + (b[2] << 16); \ |
| 0 | 328 } else { \ |
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329 Pixel = (b[0] << 16) + (b[1] << 8) + b[2]; \ |
| 0 | 330 } \ |
| 331 } \ | |
| 332 break; \ | |
| 333 \ | |
| 334 case 4: \ | |
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335 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 336 break; \ |
| 337 \ | |
| 338 default: \ | |
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339 Pixel = 0; /* stop gcc complaints */ \ |
| 0 | 340 break; \ |
| 341 } \ | |
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342 RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \ |
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343 Pixel &= ~fmt->Amask; \ |
| 0 | 344 } while(0) |
| 345 | |
| 346 /* FIXME: this isn't correct, especially for Alpha (maximum != 255) */ | |
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347 #define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a) \ |
| 0 | 348 { \ |
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349 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
| 0 | 350 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
| 351 ((b>>fmt->Bloss)<<fmt->Bshift)| \ | |
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352 ((a>>fmt->Aloss)<<fmt->Ashift); \ |
| 0 | 353 } |
| 354 #define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \ | |
| 355 { \ | |
| 356 switch (bpp) { \ | |
| 357 case 2: { \ | |
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358 Uint16 Pixel; \ |
| 0 | 359 \ |
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360 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \ |
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361 *((Uint16 *)(buf)) = Pixel; \ |
| 0 | 362 } \ |
| 363 break; \ | |
| 364 \ | |
| 365 case 3: { /* FIXME: broken code (no alpha) */ \ | |
| 366 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 367 *((buf)+fmt->Rshift/8) = r; \ | |
| 368 *((buf)+fmt->Gshift/8) = g; \ | |
| 369 *((buf)+fmt->Bshift/8) = b; \ | |
| 370 } else { \ | |
| 371 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 372 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 373 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 374 } \ | |
| 375 } \ | |
| 376 break; \ | |
| 377 \ | |
| 378 case 4: { \ | |
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379 Uint32 Pixel; \ |
| 0 | 380 \ |
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381 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \ |
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382 *((Uint32 *)(buf)) = Pixel; \ |
| 0 | 383 } \ |
| 384 break; \ | |
| 385 } \ | |
| 386 } | |
| 387 | |
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388 /* Blend the RGB values of two Pixels based on a source alpha value */ |
| 0 | 389 #define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \ |
| 390 do { \ | |
| 391 dR = (((sR-dR)*(A))>>8)+dR; \ | |
| 392 dG = (((sG-dG)*(A))>>8)+dG; \ | |
| 393 dB = (((sB-dB)*(A))>>8)+dB; \ | |
| 394 } while(0) | |
| 395 | |
|
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396 /* Blend the RGB values of two Pixels based on a source alpha value */ |
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397 #define ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB) \ |
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398 do { \ |
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399 unsigned tR, tG, tB, tA; \ |
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400 tA = 255 - sA; \ |
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401 tR = 1 + (sR * sA) + (dR * tA); \ |
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402 dR = (tR + (tR >> 8)) >> 8; \ |
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403 tG = 1 + (sG * sA) + (dG * tA); \ |
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404 dG = (tG + (tG >> 8)) >> 8; \ |
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405 tB = 1 + (sB * sA) + (dB * tA); \ |
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406 dB = (tB + (tB >> 8)) >> 8; \ |
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407 } while(0) |
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408 |
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409 |
| 0 | 410 /* This is a very useful loop for optimizing blitters */ |
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411 #if defined(_MSC_VER) && (_MSC_VER == 1300) |
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412 /* There's a bug in the Visual C++ 7 optimizer when compiling this code */ |
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413 #else |
| 0 | 414 #define USE_DUFFS_LOOP |
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415 #endif |
| 0 | 416 #ifdef USE_DUFFS_LOOP |
| 417 | |
| 418 /* 8-times unrolled loop */ | |
| 419 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 420 { int n = (width+7)/8; \ | |
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421 switch (width & 7) { \ |
| 0 | 422 case 0: do { pixel_copy_increment; \ |
| 423 case 7: pixel_copy_increment; \ | |
| 424 case 6: pixel_copy_increment; \ | |
| 425 case 5: pixel_copy_increment; \ | |
| 426 case 4: pixel_copy_increment; \ | |
| 427 case 3: pixel_copy_increment; \ | |
| 428 case 2: pixel_copy_increment; \ | |
| 429 case 1: pixel_copy_increment; \ | |
| 430 } while ( --n > 0 ); \ | |
| 431 } \ | |
| 432 } | |
| 433 | |
| 434 /* 4-times unrolled loop */ | |
| 435 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 436 { int n = (width+3)/4; \ | |
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437 switch (width & 3) { \ |
| 0 | 438 case 0: do { pixel_copy_increment; \ |
| 439 case 3: pixel_copy_increment; \ | |
| 440 case 2: pixel_copy_increment; \ | |
| 441 case 1: pixel_copy_increment; \ | |
| 442 } while ( --n > 0 ); \ | |
| 443 } \ | |
| 444 } | |
| 445 | |
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446 /* 2 - times unrolled loop */ |
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447 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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448 double_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 > 0 ) { \ |
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455 n = ( w + 2) / 4; \ |
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456 switch( w & 2 ) { \ |
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457 case 0: do { double_pixel_copy_increment; \ |
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458 case 2: double_pixel_copy_increment; \ |
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459 } while ( --n > 0 ); \ |
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460 } \ |
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461 } \ |
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462 } |
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463 |
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464 /* 2 - times unrolled loop 4 pixels */ |
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465 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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466 double_pixel_copy_increment, \ |
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467 quatro_pixel_copy_increment, width) \ |
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468 { int n, w = width; \ |
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469 if(w & 1) { \ |
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470 pixel_copy_increment; \ |
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471 w--; \ |
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472 } \ |
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473 if(w & 2) { \ |
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474 double_pixel_copy_increment; \ |
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475 w -= 2; \ |
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476 } \ |
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477 if ( w > 0 ) { \ |
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478 n = ( w + 7 ) / 8; \ |
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479 switch( w & 4 ) { \ |
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480 case 0: do { quatro_pixel_copy_increment; \ |
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481 case 4: quatro_pixel_copy_increment; \ |
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482 } while ( --n > 0 ); \ |
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483 } \ |
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484 } \ |
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485 } |
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486 |
| 0 | 487 /* Use the 8-times version of the loop by default */ |
| 488 #define DUFFS_LOOP(pixel_copy_increment, width) \ | |
| 489 DUFFS_LOOP8(pixel_copy_increment, width) | |
| 490 | |
| 491 #else | |
| 492 | |
| 493 /* Don't use Duff's device to unroll loops */ | |
|
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494 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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495 double_pixel_copy_increment, width) \ |
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496 { int n = width; \ |
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497 if( n & 1 ) { \ |
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498 pixel_copy_increment; \ |
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499 n--; \ |
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500 } \ |
|
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501 n=n>>1; \ |
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502 for(; n > 0; --n) { \ |
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503 double_pixel_copy_increment; \ |
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504 } \ |
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505 } |
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506 |
|
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507 /* Don't use Duff's device to unroll loops */ |
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508 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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509 double_pixel_copy_increment, \ |
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510 quatro_pixel_copy_increment, width) \ |
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511 { int n = width; \ |
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512 if(n & 1) { \ |
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513 pixel_copy_increment; \ |
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514 n--; \ |
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515 } \ |
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516 if(n & 2) { \ |
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517 double_pixel_copy_increment; \ |
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518 n -= 2; \ |
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519 } \ |
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520 n=n>>2; \ |
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521 for(; n > 0; --n) { \ |
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522 quatro_pixel_copy_increment; \ |
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523 } \ |
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524 } |
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525 |
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526 /* Don't use Duff's device to unroll loops */ |
| 0 | 527 #define DUFFS_LOOP(pixel_copy_increment, width) \ |
| 528 { int n; \ | |
| 529 for ( n=width; n > 0; --n ) { \ | |
| 530 pixel_copy_increment; \ | |
| 531 } \ | |
| 532 } | |
| 533 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 534 DUFFS_LOOP(pixel_copy_increment, width) | |
| 535 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 536 DUFFS_LOOP(pixel_copy_increment, width) | |
| 537 | |
| 538 #endif /* USE_DUFFS_LOOP */ | |
| 539 | |
| 540 /* Prevent Visual C++ 6.0 from printing out stupid warnings */ | |
| 541 #if defined(_MSC_VER) && (_MSC_VER >= 600) | |
| 542 #pragma warning(disable: 4550) | |
| 543 #endif | |
| 544 | |
| 545 #endif /* _SDL_blit_h */ | |
|
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546 /* vi: set ts=4 sw=4 expandtab: */ |