Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.h @ 4085:51486c979189 SDL-1.2
> Hi Ryan,
> I checked the list you linked to, but did not see any reference to whether
> the Win32 window centering bug was fixed... Has that been addressed at all?
> I refer to the bug where, unless one has globally set the
> SDL_WINDOW_CENTERED variable in the OS, only the 1st window that is created
> will be centered. Subsequent calls to SetVideoMode will create a window tha
t
> shares the same upper-left corner location.
I'm working on that now, thanks for reporting it. What I'm doing is if the
width and height are the same, I'm leaving the window position alone, but if
they're different they will respect the positioning environment variables.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 20 Jul 2007 03:25:40 +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 */ |