Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.h @ 2079:1ed2155b7ee4
From: Torsten Giebl
Subject: ALLOCA Patch for SDL-1.2
Newsgroups: gmane.comp.lib.sdl
Date: 2006-10-24 00:31:16 GMT
Hello !
As alloca.h is not available on CYGWIN and MinGW32
it should not be checked there or it should be checked
with -mno-cygwin using.
I am a total configure.in newbie, but i found the way
that things are handled in configure.in pretty bad for the
case CYGWIN with MinGW Mode or not.
Maybe this is not possible but i would like to
have a way to detect at the start for example CYGWIN
and then add. ask if configure was called with --enable-cygwin
for example. --enable-cygwin should be optional and disabled
by default as we want to have MinGW Mode by default.
Only if the user wants it he should be able to use it.
Then the whole configure.in would get add. questions
okay the system is CYGWIN with or without MinGW Mode.
The alloca.h thing for example is only
available under CYGWIN ( without MinGW Mode ).
CU
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 01 Dec 2006 20:25:03 +0000 |
| parents | c121d94672cb |
| children | 93994f65c74c |
| 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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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 | |
| 70 | |
| 71 /* Functions found in SDL_blit.c */ | |
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72 extern int SDL_CalculateBlit(SDL_Surface * surface); |
| 0 | 73 |
| 74 /* Functions found in SDL_blit_{0,1,N,A}.c */ | |
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75 extern SDL_loblit SDL_CalculateBlit0(SDL_Surface * surface, int complex); |
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76 extern SDL_loblit SDL_CalculateBlit1(SDL_Surface * surface, int complex); |
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77 extern SDL_loblit SDL_CalculateBlitN(SDL_Surface * surface, int complex); |
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78 extern SDL_loblit SDL_CalculateAlphaBlit(SDL_Surface * surface, int complex); |
| 0 | 79 |
| 80 /* | |
| 81 * Useful macros for blitting routines | |
| 82 */ | |
| 83 | |
| 84 #define FORMAT_EQUAL(A, B) \ | |
| 85 ((A)->BitsPerPixel == (B)->BitsPerPixel \ | |
| 86 && ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask)) | |
| 87 | |
| 88 /* Load pixel of the specified format from a buffer and get its R-G-B values */ | |
| 89 /* FIXME: rescale values to 0..255 here? */ | |
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90 #define RGB_FROM_PIXEL(Pixel, fmt, r, g, b) \ |
| 0 | 91 { \ |
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92 r = (((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); \ |
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93 g = (((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); \ |
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94 b = (((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); \ |
| 0 | 95 } |
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96 #define RGB_FROM_RGB565(Pixel, r, g, b) \ |
| 0 | 97 { \ |
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98 r = (((Pixel&0xF800)>>11)<<3); \ |
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99 g = (((Pixel&0x07E0)>>5)<<2); \ |
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100 b = ((Pixel&0x001F)<<3); \ |
| 0 | 101 } |
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102 #define RGB_FROM_RGB555(Pixel, r, g, b) \ |
| 0 | 103 { \ |
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104 r = (((Pixel&0x7C00)>>10)<<3); \ |
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105 g = (((Pixel&0x03E0)>>5)<<3); \ |
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106 b = ((Pixel&0x001F)<<3); \ |
| 0 | 107 } |
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108 #define RGB_FROM_RGB888(Pixel, r, g, b) \ |
| 0 | 109 { \ |
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110 r = ((Pixel&0xFF0000)>>16); \ |
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111 g = ((Pixel&0xFF00)>>8); \ |
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112 b = (Pixel&0xFF); \ |
| 0 | 113 } |
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114 #define RETRIEVE_RGB_PIXEL(buf, bpp, Pixel) \ |
| 0 | 115 do { \ |
| 116 switch (bpp) { \ | |
| 117 case 2: \ | |
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118 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 119 break; \ |
| 120 \ | |
| 121 case 3: { \ | |
| 122 Uint8 *B = (Uint8 *)(buf); \ | |
| 123 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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124 Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ |
| 0 | 125 } else { \ |
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126 Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ |
| 0 | 127 } \ |
| 128 } \ | |
| 129 break; \ | |
| 130 \ | |
| 131 case 4: \ | |
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132 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 133 break; \ |
| 134 \ | |
| 135 default: \ | |
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136 Pixel = 0; /* appease gcc */ \ |
| 0 | 137 break; \ |
| 138 } \ | |
| 139 } while(0) | |
| 140 | |
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141 #define DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b) \ |
| 0 | 142 do { \ |
| 143 switch (bpp) { \ | |
| 144 case 2: \ | |
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145 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 146 break; \ |
| 147 \ | |
| 148 case 3: { \ | |
| 149 Uint8 *B = (Uint8 *)buf; \ | |
| 150 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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151 Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ |
| 0 | 152 } else { \ |
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153 Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ |
| 0 | 154 } \ |
| 155 } \ | |
| 156 break; \ | |
| 157 \ | |
| 158 case 4: \ | |
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159 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 160 break; \ |
| 161 \ | |
| 162 default: \ | |
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163 Pixel = 0; /* prevent gcc from complaining */ \ |
| 0 | 164 break; \ |
| 165 } \ | |
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166 RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \ |
| 0 | 167 } while(0) |
| 168 | |
| 169 /* Assemble R-G-B values into a specified pixel format and store them */ | |
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170 #define PIXEL_FROM_RGB(Pixel, fmt, r, g, b) \ |
| 0 | 171 { \ |
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172 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
| 0 | 173 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
| 174 ((b>>fmt->Bloss)<<fmt->Bshift); \ | |
| 175 } | |
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176 #define RGB565_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 177 { \ |
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178 Pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3); \ |
| 0 | 179 } |
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180 #define RGB555_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 181 { \ |
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182 Pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3); \ |
| 0 | 183 } |
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184 #define RGB888_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 185 { \ |
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186 Pixel = (r<<16)|(g<<8)|b; \ |
| 0 | 187 } |
| 188 #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \ | |
| 189 { \ | |
| 190 switch (bpp) { \ | |
| 191 case 2: { \ | |
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192 Uint16 Pixel; \ |
| 0 | 193 \ |
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194 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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195 *((Uint16 *)(buf)) = Pixel; \ |
| 0 | 196 } \ |
| 197 break; \ | |
| 198 \ | |
| 199 case 3: { \ | |
| 200 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 201 *((buf)+fmt->Rshift/8) = r; \ | |
| 202 *((buf)+fmt->Gshift/8) = g; \ | |
| 203 *((buf)+fmt->Bshift/8) = b; \ | |
| 204 } else { \ | |
| 205 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 206 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 207 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 208 } \ | |
| 209 } \ | |
| 210 break; \ | |
| 211 \ | |
| 212 case 4: { \ | |
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213 Uint32 Pixel; \ |
| 0 | 214 \ |
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215 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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216 *((Uint32 *)(buf)) = Pixel; \ |
| 0 | 217 } \ |
| 218 break; \ | |
| 219 } \ | |
| 220 } | |
| 221 #define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask) \ | |
| 222 { \ | |
| 223 switch (bpp) { \ | |
| 224 case 2: { \ | |
| 225 Uint16 *bufp; \ | |
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226 Uint16 Pixel; \ |
| 0 | 227 \ |
| 228 bufp = (Uint16 *)buf; \ | |
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229 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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230 *bufp = Pixel | (*bufp & Amask); \ |
| 0 | 231 } \ |
| 232 break; \ | |
| 233 \ | |
| 234 case 3: { \ | |
| 235 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 236 *((buf)+fmt->Rshift/8) = r; \ | |
| 237 *((buf)+fmt->Gshift/8) = g; \ | |
| 238 *((buf)+fmt->Bshift/8) = b; \ | |
| 239 } else { \ | |
| 240 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 241 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 242 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 243 } \ | |
| 244 } \ | |
| 245 break; \ | |
| 246 \ | |
| 247 case 4: { \ | |
| 248 Uint32 *bufp; \ | |
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249 Uint32 Pixel; \ |
| 0 | 250 \ |
| 251 bufp = (Uint32 *)buf; \ | |
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252 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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253 *bufp = Pixel | (*bufp & Amask); \ |
| 0 | 254 } \ |
| 255 break; \ | |
| 256 } \ | |
| 257 } | |
| 258 | |
| 259 /* FIXME: Should we rescale alpha into 0..255 here? */ | |
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260 #define RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a) \ |
| 0 | 261 { \ |
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262 r = ((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; \ |
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263 g = ((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; \ |
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264 b = ((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \ |
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265 a = ((Pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \ |
| 0 | 266 } |
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267 #define RGBA_FROM_8888(Pixel, fmt, r, g, b, a) \ |
| 0 | 268 { \ |
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269 r = (Pixel&fmt->Rmask)>>fmt->Rshift; \ |
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270 g = (Pixel&fmt->Gmask)>>fmt->Gshift; \ |
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271 b = (Pixel&fmt->Bmask)>>fmt->Bshift; \ |
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272 a = (Pixel&fmt->Amask)>>fmt->Ashift; \ |
| 0 | 273 } |
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274 #define RGBA_FROM_RGBA8888(Pixel, r, g, b, a) \ |
| 0 | 275 { \ |
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276 r = (Pixel>>24); \ |
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277 g = ((Pixel>>16)&0xFF); \ |
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278 b = ((Pixel>>8)&0xFF); \ |
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279 a = (Pixel&0xFF); \ |
| 0 | 280 } |
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281 #define RGBA_FROM_ARGB8888(Pixel, r, g, b, a) \ |
| 0 | 282 { \ |
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283 r = ((Pixel>>16)&0xFF); \ |
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284 g = ((Pixel>>8)&0xFF); \ |
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285 b = (Pixel&0xFF); \ |
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286 a = (Pixel>>24); \ |
| 0 | 287 } |
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288 #define RGBA_FROM_ABGR8888(Pixel, r, g, b, a) \ |
| 0 | 289 { \ |
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290 r = (Pixel&0xFF); \ |
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291 g = ((Pixel>>8)&0xFF); \ |
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292 b = ((Pixel>>16)&0xFF); \ |
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293 a = (Pixel>>24); \ |
| 0 | 294 } |
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295 #define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a) \ |
| 0 | 296 do { \ |
| 297 switch (bpp) { \ | |
| 298 case 2: \ | |
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299 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 300 break; \ |
| 301 \ | |
| 302 case 3: {/* FIXME: broken code (no alpha) */ \ | |
| 303 Uint8 *b = (Uint8 *)buf; \ | |
| 304 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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305 Pixel = b[0] + (b[1] << 8) + (b[2] << 16); \ |
| 0 | 306 } else { \ |
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307 Pixel = (b[0] << 16) + (b[1] << 8) + b[2]; \ |
| 0 | 308 } \ |
| 309 } \ | |
| 310 break; \ | |
| 311 \ | |
| 312 case 4: \ | |
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313 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 314 break; \ |
| 315 \ | |
| 316 default: \ | |
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317 Pixel = 0; /* stop gcc complaints */ \ |
| 0 | 318 break; \ |
| 319 } \ | |
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320 RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \ |
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321 Pixel &= ~fmt->Amask; \ |
| 0 | 322 } while(0) |
| 323 | |
| 324 /* FIXME: this isn't correct, especially for Alpha (maximum != 255) */ | |
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325 #define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a) \ |
| 0 | 326 { \ |
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327 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
| 0 | 328 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
| 329 ((b>>fmt->Bloss)<<fmt->Bshift)| \ | |
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330 ((a>>fmt->Aloss)<<fmt->Ashift); \ |
| 0 | 331 } |
| 332 #define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \ | |
| 333 { \ | |
| 334 switch (bpp) { \ | |
| 335 case 2: { \ | |
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336 Uint16 Pixel; \ |
| 0 | 337 \ |
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338 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \ |
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339 *((Uint16 *)(buf)) = Pixel; \ |
| 0 | 340 } \ |
| 341 break; \ | |
| 342 \ | |
| 343 case 3: { /* FIXME: broken code (no alpha) */ \ | |
| 344 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 345 *((buf)+fmt->Rshift/8) = r; \ | |
| 346 *((buf)+fmt->Gshift/8) = g; \ | |
| 347 *((buf)+fmt->Bshift/8) = b; \ | |
| 348 } else { \ | |
| 349 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 350 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 351 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 352 } \ | |
| 353 } \ | |
| 354 break; \ | |
| 355 \ | |
| 356 case 4: { \ | |
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357 Uint32 Pixel; \ |
| 0 | 358 \ |
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359 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \ |
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360 *((Uint32 *)(buf)) = Pixel; \ |
| 0 | 361 } \ |
| 362 break; \ | |
| 363 } \ | |
| 364 } | |
| 365 | |
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366 /* Blend the RGB values of two Pixels based on a source alpha value */ |
| 0 | 367 #define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \ |
| 368 do { \ | |
| 369 dR = (((sR-dR)*(A))>>8)+dR; \ | |
| 370 dG = (((sG-dG)*(A))>>8)+dG; \ | |
| 371 dB = (((sB-dB)*(A))>>8)+dB; \ | |
| 372 } while(0) | |
| 373 | |
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374 /* Blend the RGB values of two Pixels based on a source alpha value */ |
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375 #define ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB) \ |
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376 do { \ |
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377 unsigned tR, tG, tB, tA; \ |
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378 tA = 255 - sA; \ |
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379 tR = 1 + (sR * sA) + (dR * tA); \ |
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380 dR = (tR + (tR >> 8)) >> 8; \ |
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381 tG = 1 + (sG * sA) + (dG * tA); \ |
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382 dG = (tG + (tG >> 8)) >> 8; \ |
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383 tB = 1 + (sB * sA) + (dB * tA); \ |
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384 dB = (tB + (tB >> 8)) >> 8; \ |
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385 } while(0) |
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386 |
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387 |
| 0 | 388 /* This is a very useful loop for optimizing blitters */ |
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389 #if defined(_MSC_VER) && (_MSC_VER == 1300) |
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390 /* There's a bug in the Visual C++ 7 optimizer when compiling this code */ |
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391 #else |
| 0 | 392 #define USE_DUFFS_LOOP |
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393 #endif |
| 0 | 394 #ifdef USE_DUFFS_LOOP |
| 395 | |
| 396 /* 8-times unrolled loop */ | |
| 397 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 398 { int n = (width+7)/8; \ | |
|
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399 switch (width & 7) { \ |
| 0 | 400 case 0: do { pixel_copy_increment; \ |
| 401 case 7: pixel_copy_increment; \ | |
| 402 case 6: pixel_copy_increment; \ | |
| 403 case 5: pixel_copy_increment; \ | |
| 404 case 4: pixel_copy_increment; \ | |
| 405 case 3: pixel_copy_increment; \ | |
| 406 case 2: pixel_copy_increment; \ | |
| 407 case 1: pixel_copy_increment; \ | |
| 408 } while ( --n > 0 ); \ | |
| 409 } \ | |
| 410 } | |
| 411 | |
| 412 /* 4-times unrolled loop */ | |
| 413 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 414 { int n = (width+3)/4; \ | |
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415 switch (width & 3) { \ |
| 0 | 416 case 0: do { pixel_copy_increment; \ |
| 417 case 3: pixel_copy_increment; \ | |
| 418 case 2: pixel_copy_increment; \ | |
| 419 case 1: pixel_copy_increment; \ | |
| 420 } while ( --n > 0 ); \ | |
| 421 } \ | |
| 422 } | |
| 423 | |
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424 /* 2 - times unrolled loop */ |
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425 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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426 double_pixel_copy_increment, width) \ |
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427 { int n, w = width; \ |
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428 if( w & 1 ) { \ |
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429 pixel_copy_increment; \ |
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430 w--; \ |
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431 } \ |
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432 if ( w > 0 ) { \ |
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433 n = ( w + 2) / 4; \ |
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434 switch( w & 2 ) { \ |
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435 case 0: do { double_pixel_copy_increment; \ |
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436 case 2: double_pixel_copy_increment; \ |
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437 } while ( --n > 0 ); \ |
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438 } \ |
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439 } \ |
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440 } |
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441 |
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442 /* 2 - times unrolled loop 4 pixels */ |
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443 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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444 double_pixel_copy_increment, \ |
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445 quatro_pixel_copy_increment, width) \ |
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446 { int n, w = width; \ |
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447 if(w & 1) { \ |
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448 pixel_copy_increment; \ |
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449 w--; \ |
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450 } \ |
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451 if(w & 2) { \ |
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452 double_pixel_copy_increment; \ |
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453 w -= 2; \ |
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454 } \ |
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455 if ( w > 0 ) { \ |
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456 n = ( w + 7 ) / 8; \ |
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457 switch( w & 4 ) { \ |
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458 case 0: do { quatro_pixel_copy_increment; \ |
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459 case 4: quatro_pixel_copy_increment; \ |
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460 } while ( --n > 0 ); \ |
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461 } \ |
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462 } \ |
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463 } |
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464 |
| 0 | 465 /* Use the 8-times version of the loop by default */ |
| 466 #define DUFFS_LOOP(pixel_copy_increment, width) \ | |
| 467 DUFFS_LOOP8(pixel_copy_increment, width) | |
| 468 | |
| 469 #else | |
| 470 | |
| 471 /* Don't use Duff's device to unroll loops */ | |
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472 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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473 double_pixel_copy_increment, width) \ |
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474 { int n = width; \ |
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475 if( n & 1 ) { \ |
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476 pixel_copy_increment; \ |
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477 n--; \ |
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478 } \ |
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479 n=n>>1; \ |
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480 for(; n > 0; --n) { \ |
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481 double_pixel_copy_increment; \ |
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482 } \ |
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483 } |
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484 |
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485 /* Don't use Duff's device to unroll loops */ |
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486 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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487 double_pixel_copy_increment, \ |
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488 quatro_pixel_copy_increment, width) \ |
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489 { int n = width; \ |
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490 if(n & 1) { \ |
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491 pixel_copy_increment; \ |
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492 n--; \ |
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493 } \ |
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494 if(n & 2) { \ |
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495 double_pixel_copy_increment; \ |
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496 n -= 2; \ |
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497 } \ |
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498 n=n>>2; \ |
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499 for(; n > 0; --n) { \ |
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500 quatro_pixel_copy_increment; \ |
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501 } \ |
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502 } |
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503 |
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504 /* Don't use Duff's device to unroll loops */ |
| 0 | 505 #define DUFFS_LOOP(pixel_copy_increment, width) \ |
| 506 { int n; \ | |
| 507 for ( n=width; n > 0; --n ) { \ | |
| 508 pixel_copy_increment; \ | |
| 509 } \ | |
| 510 } | |
| 511 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 512 DUFFS_LOOP(pixel_copy_increment, width) | |
| 513 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 514 DUFFS_LOOP(pixel_copy_increment, width) | |
| 515 | |
| 516 #endif /* USE_DUFFS_LOOP */ | |
| 517 | |
| 518 /* Prevent Visual C++ 6.0 from printing out stupid warnings */ | |
| 519 #if defined(_MSC_VER) && (_MSC_VER >= 600) | |
| 520 #pragma warning(disable: 4550) | |
| 521 #endif | |
| 522 | |
| 523 #endif /* _SDL_blit_h */ | |
|
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524 /* vi: set ts=4 sw=4 expandtab: */ |