Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.h @ 2838:00356f22195a
Fixed SDL_SetAlpha compatibility function to match the documentation
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 06 Dec 2008 05:49:53 +0000 |
| parents | 4dba7aa7ea77 |
| children | 6258fa7cd300 |
| 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 __3dNOW__ |
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31 #include <mm3dnow.h> |
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32 #endif |
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33 #ifdef __SSE__ |
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34 #include <xmmintrin.h> |
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35 #endif |
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36 #ifdef __SSE2__ |
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37 #include <emmintrin.h> |
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38 #endif |
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39 |
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40 #include "SDL_cpuinfo.h" |
| 0 | 41 #include "SDL_endian.h" |
| 42 | |
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43 /* SDL blit copy flags */ |
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44 #define SDL_COPY_MODULATE_COLOR 0x00000001 |
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45 #define SDL_COPY_MODULATE_ALPHA 0x00000002 |
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46 #define SDL_COPY_MASK 0x00000010 |
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47 #define SDL_COPY_BLEND 0x00000020 |
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48 #define SDL_COPY_ADD 0x00000040 |
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49 #define SDL_COPY_MOD 0x00000080 |
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50 #define SDL_COPY_COLORKEY 0x00000100 |
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51 #define SDL_COPY_NEAREST 0x00000200 |
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52 #define SDL_COPY_RLE_DESIRED 0x00001000 |
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53 #define SDL_COPY_RLE_COLORKEY 0x00002000 |
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54 #define SDL_COPY_RLE_ALPHAKEY 0x00004000 |
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55 |
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56 /* SDL blit CPU flags */ |
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57 #define SDL_CPU_ANY 0x00000000 |
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58 #define SDL_CPU_MMX 0x00000001 |
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59 #define SDL_CPU_3DNOW 0x00000002 |
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60 #define SDL_CPU_SSE 0x00000004 |
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61 #define SDL_CPU_SSE2 0x00000008 |
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62 #define SDL_CPU_ALTIVEC_PREFETCH 0x00000010 |
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63 #define SDL_CPU_ALTIVEC_NOPREFETCH 0x00000020 |
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64 |
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65 typedef struct |
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66 { |
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67 Uint8 *src; |
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68 int src_w, src_h; |
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69 int src_pitch; |
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70 int src_skip; |
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71 Uint8 *dst; |
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72 int dst_w, dst_h; |
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73 int dst_pitch; |
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74 int dst_skip; |
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75 SDL_PixelFormat *src_fmt; |
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76 SDL_PixelFormat *dst_fmt; |
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77 Uint8 *table; |
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78 int flags; |
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79 Uint32 colorkey; |
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80 Uint8 r, g, b, a; |
| 0 | 81 } SDL_BlitInfo; |
| 82 | |
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83 typedef void (SDLCALL * SDL_BlitFunc) (SDL_BlitInfo * info); |
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84 |
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85 typedef struct |
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86 { |
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87 Uint32 src_format; |
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88 Uint32 dst_format; |
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89 int flags; |
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90 int cpu; |
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91 SDL_BlitFunc func; |
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92 } SDL_BlitFuncEntry; |
| 0 | 93 |
| 94 /* Blit mapping definition */ | |
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95 typedef struct SDL_BlitMap |
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96 { |
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97 SDL_Surface *dst; |
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98 int identity; |
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99 SDL_blit blit; |
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100 void *data; |
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101 SDL_BlitInfo info; |
| 0 | 102 |
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103 /* the version count matches the destination; mismatch indicates |
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104 an invalid mapping */ |
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105 unsigned int format_version; |
| 0 | 106 } SDL_BlitMap; |
| 107 | |
| 108 /* Functions found in SDL_blit.c */ | |
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109 extern int SDL_CalculateBlit(SDL_Surface * surface); |
| 0 | 110 |
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111 /* Functions found in SDL_blit_*.c */ |
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112 extern SDL_BlitFunc SDL_CalculateBlit0(SDL_Surface * surface); |
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113 extern SDL_BlitFunc SDL_CalculateBlit1(SDL_Surface * surface); |
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114 extern SDL_BlitFunc SDL_CalculateBlitN(SDL_Surface * surface); |
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115 extern SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface * surface); |
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116 |
| 0 | 117 /* |
| 118 * Useful macros for blitting routines | |
| 119 */ | |
| 120 | |
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121 #if defined(__GNUC__) |
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122 #define DECLARE_ALIGNED(t,v,a) t __attribute__((aligned(a))) v |
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123 #elif defined(_MSC_VER) |
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124 #define DECLARE_ALIGNED(t,v,a) __declspec(align(a)) t v |
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125 #else |
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126 #define DECLARE_ALIGNED(t,v,a) t v |
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127 #endif |
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128 |
| 0 | 129 #define FORMAT_EQUAL(A, B) \ |
| 130 ((A)->BitsPerPixel == (B)->BitsPerPixel \ | |
| 131 && ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask)) | |
| 132 | |
| 133 /* Load pixel of the specified format from a buffer and get its R-G-B values */ | |
| 134 /* FIXME: rescale values to 0..255 here? */ | |
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135 #define RGB_FROM_PIXEL(Pixel, fmt, r, g, b) \ |
| 0 | 136 { \ |
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137 r = (((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); \ |
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138 g = (((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); \ |
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139 b = (((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); \ |
| 0 | 140 } |
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141 #define RGB_FROM_RGB565(Pixel, r, g, b) \ |
| 0 | 142 { \ |
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143 r = (((Pixel&0xF800)>>11)<<3); \ |
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144 g = (((Pixel&0x07E0)>>5)<<2); \ |
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145 b = ((Pixel&0x001F)<<3); \ |
| 0 | 146 } |
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147 #define RGB_FROM_RGB555(Pixel, r, g, b) \ |
| 0 | 148 { \ |
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149 r = (((Pixel&0x7C00)>>10)<<3); \ |
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150 g = (((Pixel&0x03E0)>>5)<<3); \ |
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151 b = ((Pixel&0x001F)<<3); \ |
| 0 | 152 } |
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153 #define RGB_FROM_RGB888(Pixel, r, g, b) \ |
| 0 | 154 { \ |
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155 r = ((Pixel&0xFF0000)>>16); \ |
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156 g = ((Pixel&0xFF00)>>8); \ |
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157 b = (Pixel&0xFF); \ |
| 0 | 158 } |
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159 #define RETRIEVE_RGB_PIXEL(buf, bpp, Pixel) \ |
| 0 | 160 do { \ |
| 161 switch (bpp) { \ | |
| 162 case 2: \ | |
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163 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 164 break; \ |
| 165 \ | |
| 166 case 3: { \ | |
| 167 Uint8 *B = (Uint8 *)(buf); \ | |
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168 if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
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169 Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ |
| 0 | 170 } else { \ |
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171 Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ |
| 0 | 172 } \ |
| 173 } \ | |
| 174 break; \ | |
| 175 \ | |
| 176 case 4: \ | |
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177 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 178 break; \ |
| 179 \ | |
| 180 default: \ | |
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181 Pixel; /* stop gcc complaints */ \ |
| 0 | 182 break; \ |
| 183 } \ | |
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184 } while (0) |
| 0 | 185 |
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186 #define DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b) \ |
| 0 | 187 do { \ |
| 188 switch (bpp) { \ | |
| 189 case 2: \ | |
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190 Pixel = *((Uint16 *)(buf)); \ |
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191 RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \ |
| 0 | 192 break; \ |
| 193 \ | |
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194 case 3: { \ |
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195 if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
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196 r = *((buf)+fmt->Rshift/8); \ |
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197 g = *((buf)+fmt->Gshift/8); \ |
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198 b = *((buf)+fmt->Bshift/8); \ |
| 0 | 199 } else { \ |
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200 r = *((buf)+2-fmt->Rshift/8); \ |
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201 g = *((buf)+2-fmt->Gshift/8); \ |
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202 b = *((buf)+2-fmt->Bshift/8); \ |
| 0 | 203 } \ |
| 204 } \ | |
| 205 break; \ | |
| 206 \ | |
| 207 case 4: \ | |
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208 Pixel = *((Uint32 *)(buf)); \ |
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209 RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \ |
| 0 | 210 break; \ |
| 211 \ | |
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212 default: \ |
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213 Pixel; /* stop gcc complaints */ \ |
| 0 | 214 break; \ |
| 215 } \ | |
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216 } while (0) |
| 0 | 217 |
| 218 /* Assemble R-G-B values into a specified pixel format and store them */ | |
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219 #define PIXEL_FROM_RGB(Pixel, fmt, r, g, b) \ |
| 0 | 220 { \ |
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221 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
| 0 | 222 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
| 223 ((b>>fmt->Bloss)<<fmt->Bshift); \ | |
| 224 } | |
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225 #define RGB565_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 226 { \ |
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227 Pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3); \ |
| 0 | 228 } |
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229 #define RGB555_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 230 { \ |
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231 Pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3); \ |
| 0 | 232 } |
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233 #define RGB888_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 234 { \ |
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235 Pixel = (r<<16)|(g<<8)|b; \ |
| 0 | 236 } |
| 237 #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \ | |
| 238 { \ | |
| 239 switch (bpp) { \ | |
| 240 case 2: { \ | |
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241 Uint16 Pixel; \ |
| 0 | 242 \ |
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243 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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244 *((Uint16 *)(buf)) = Pixel; \ |
| 0 | 245 } \ |
| 246 break; \ | |
| 247 \ | |
| 248 case 3: { \ | |
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249 if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
| 0 | 250 *((buf)+fmt->Rshift/8) = r; \ |
| 251 *((buf)+fmt->Gshift/8) = g; \ | |
| 252 *((buf)+fmt->Bshift/8) = b; \ | |
| 253 } else { \ | |
| 254 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 255 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 256 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 257 } \ | |
| 258 } \ | |
| 259 break; \ | |
| 260 \ | |
| 261 case 4: { \ | |
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262 Uint32 Pixel; \ |
| 0 | 263 \ |
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264 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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265 *((Uint32 *)(buf)) = Pixel; \ |
| 0 | 266 } \ |
| 267 break; \ | |
| 268 } \ | |
| 269 } | |
| 270 #define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask) \ | |
| 271 { \ | |
| 272 switch (bpp) { \ | |
| 273 case 2: { \ | |
| 274 Uint16 *bufp; \ | |
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275 Uint16 Pixel; \ |
| 0 | 276 \ |
| 277 bufp = (Uint16 *)buf; \ | |
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278 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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279 *bufp = Pixel | (*bufp & Amask); \ |
| 0 | 280 } \ |
| 281 break; \ | |
| 282 \ | |
| 283 case 3: { \ | |
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284 if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
| 0 | 285 *((buf)+fmt->Rshift/8) = r; \ |
| 286 *((buf)+fmt->Gshift/8) = g; \ | |
| 287 *((buf)+fmt->Bshift/8) = b; \ | |
| 288 } else { \ | |
| 289 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 290 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 291 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 292 } \ | |
| 293 } \ | |
| 294 break; \ | |
| 295 \ | |
| 296 case 4: { \ | |
| 297 Uint32 *bufp; \ | |
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298 Uint32 Pixel; \ |
| 0 | 299 \ |
| 300 bufp = (Uint32 *)buf; \ | |
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301 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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302 *bufp = Pixel | (*bufp & Amask); \ |
| 0 | 303 } \ |
| 304 break; \ | |
| 305 } \ | |
| 306 } | |
| 307 | |
| 308 /* FIXME: Should we rescale alpha into 0..255 here? */ | |
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309 #define RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a) \ |
| 0 | 310 { \ |
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311 r = ((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; \ |
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312 g = ((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; \ |
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313 b = ((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \ |
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314 a = ((Pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \ |
| 0 | 315 } |
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316 #define RGBA_FROM_8888(Pixel, fmt, r, g, b, a) \ |
| 0 | 317 { \ |
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318 r = (Pixel&fmt->Rmask)>>fmt->Rshift; \ |
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319 g = (Pixel&fmt->Gmask)>>fmt->Gshift; \ |
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320 b = (Pixel&fmt->Bmask)>>fmt->Bshift; \ |
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321 a = (Pixel&fmt->Amask)>>fmt->Ashift; \ |
| 0 | 322 } |
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323 #define RGBA_FROM_RGBA8888(Pixel, r, g, b, a) \ |
| 0 | 324 { \ |
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325 r = (Pixel>>24); \ |
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326 g = ((Pixel>>16)&0xFF); \ |
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327 b = ((Pixel>>8)&0xFF); \ |
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328 a = (Pixel&0xFF); \ |
| 0 | 329 } |
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330 #define RGBA_FROM_ARGB8888(Pixel, r, g, b, a) \ |
| 0 | 331 { \ |
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332 r = ((Pixel>>16)&0xFF); \ |
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333 g = ((Pixel>>8)&0xFF); \ |
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334 b = (Pixel&0xFF); \ |
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335 a = (Pixel>>24); \ |
| 0 | 336 } |
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337 #define RGBA_FROM_ABGR8888(Pixel, r, g, b, a) \ |
| 0 | 338 { \ |
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339 r = (Pixel&0xFF); \ |
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340 g = ((Pixel>>8)&0xFF); \ |
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341 b = ((Pixel>>16)&0xFF); \ |
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342 a = (Pixel>>24); \ |
| 0 | 343 } |
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344 #define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a) \ |
| 0 | 345 do { \ |
| 346 switch (bpp) { \ | |
| 347 case 2: \ | |
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348 Pixel = *((Uint16 *)(buf)); \ |
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349 RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \ |
| 0 | 350 break; \ |
| 351 \ | |
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352 case 3: { \ |
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353 if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
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354 r = *((buf)+fmt->Rshift/8); \ |
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355 g = *((buf)+fmt->Gshift/8); \ |
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356 b = *((buf)+fmt->Bshift/8); \ |
| 0 | 357 } else { \ |
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358 r = *((buf)+2-fmt->Rshift/8); \ |
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359 g = *((buf)+2-fmt->Gshift/8); \ |
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360 b = *((buf)+2-fmt->Bshift/8); \ |
| 0 | 361 } \ |
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362 a = 0xFF; \ |
| 0 | 363 } \ |
| 364 break; \ | |
| 365 \ | |
| 366 case 4: \ | |
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367 Pixel = *((Uint32 *)(buf)); \ |
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368 RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \ |
| 0 | 369 break; \ |
| 370 \ | |
| 371 default: \ | |
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372 Pixel; /* stop gcc complaints */ \ |
| 0 | 373 break; \ |
| 374 } \ | |
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375 } while (0) |
| 0 | 376 |
| 377 /* FIXME: this isn't correct, especially for Alpha (maximum != 255) */ | |
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378 #define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a) \ |
| 0 | 379 { \ |
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380 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
| 0 | 381 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
| 382 ((b>>fmt->Bloss)<<fmt->Bshift)| \ | |
|
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383 ((a>>fmt->Aloss)<<fmt->Ashift); \ |
| 0 | 384 } |
| 385 #define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \ | |
| 386 { \ | |
| 387 switch (bpp) { \ | |
| 388 case 2: { \ | |
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389 Uint16 Pixel; \ |
| 0 | 390 \ |
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391 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \ |
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392 *((Uint16 *)(buf)) = Pixel; \ |
| 0 | 393 } \ |
| 394 break; \ | |
| 395 \ | |
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396 case 3: { \ |
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397 if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
| 0 | 398 *((buf)+fmt->Rshift/8) = r; \ |
| 399 *((buf)+fmt->Gshift/8) = g; \ | |
| 400 *((buf)+fmt->Bshift/8) = b; \ | |
| 401 } else { \ | |
| 402 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 403 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 404 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 405 } \ | |
| 406 } \ | |
| 407 break; \ | |
| 408 \ | |
| 409 case 4: { \ | |
|
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410 Uint32 Pixel; \ |
| 0 | 411 \ |
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412 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \ |
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413 *((Uint32 *)(buf)) = Pixel; \ |
| 0 | 414 } \ |
| 415 break; \ | |
| 416 } \ | |
| 417 } | |
| 418 | |
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419 /* Blend the RGB values of two Pixels based on a source alpha value */ |
| 0 | 420 #define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \ |
| 421 do { \ | |
| 422 dR = (((sR-dR)*(A))>>8)+dR; \ | |
| 423 dG = (((sG-dG)*(A))>>8)+dG; \ | |
| 424 dB = (((sB-dB)*(A))>>8)+dB; \ | |
| 425 } while(0) | |
| 426 | |
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427 /* Blend the RGB values of two Pixels based on a source alpha value */ |
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428 #define ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB) \ |
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429 do { \ |
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430 unsigned tR, tG, tB, tA; \ |
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431 tA = 255 - sA; \ |
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432 tR = 1 + (sR * sA) + (dR * tA); \ |
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433 dR = (tR + (tR >> 8)) >> 8; \ |
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434 tG = 1 + (sG * sA) + (dG * tA); \ |
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435 dG = (tG + (tG >> 8)) >> 8; \ |
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436 tB = 1 + (sB * sA) + (dB * tA); \ |
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437 dB = (tB + (tB >> 8)) >> 8; \ |
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438 } while(0) |
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439 |
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440 |
| 0 | 441 /* This is a very useful loop for optimizing blitters */ |
|
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442 #if defined(_MSC_VER) && (_MSC_VER == 1300) |
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443 /* There's a bug in the Visual C++ 7 optimizer when compiling this code */ |
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444 #else |
| 0 | 445 #define USE_DUFFS_LOOP |
|
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446 #endif |
| 0 | 447 #ifdef USE_DUFFS_LOOP |
| 448 | |
| 449 /* 8-times unrolled loop */ | |
| 450 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 451 { int n = (width+7)/8; \ | |
|
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452 switch (width & 7) { \ |
| 0 | 453 case 0: do { pixel_copy_increment; \ |
| 454 case 7: pixel_copy_increment; \ | |
| 455 case 6: pixel_copy_increment; \ | |
| 456 case 5: pixel_copy_increment; \ | |
| 457 case 4: pixel_copy_increment; \ | |
| 458 case 3: pixel_copy_increment; \ | |
| 459 case 2: pixel_copy_increment; \ | |
| 460 case 1: pixel_copy_increment; \ | |
| 461 } while ( --n > 0 ); \ | |
| 462 } \ | |
| 463 } | |
| 464 | |
| 465 /* 4-times unrolled loop */ | |
| 466 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 467 { int n = (width+3)/4; \ | |
|
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468 switch (width & 3) { \ |
| 0 | 469 case 0: do { pixel_copy_increment; \ |
| 470 case 3: pixel_copy_increment; \ | |
| 471 case 2: pixel_copy_increment; \ | |
| 472 case 1: pixel_copy_increment; \ | |
| 473 } while ( --n > 0 ); \ | |
| 474 } \ | |
| 475 } | |
| 476 | |
|
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477 /* 2 - times unrolled loop */ |
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478 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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479 double_pixel_copy_increment, width) \ |
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480 { int n, w = width; \ |
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481 if( w & 1 ) { \ |
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482 pixel_copy_increment; \ |
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483 w--; \ |
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484 } \ |
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485 if ( w > 0 ) { \ |
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486 n = ( w + 2) / 4; \ |
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487 switch( w & 2 ) { \ |
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488 case 0: do { double_pixel_copy_increment; \ |
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489 case 2: double_pixel_copy_increment; \ |
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490 } while ( --n > 0 ); \ |
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491 } \ |
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492 } \ |
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493 } |
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494 |
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495 /* 2 - times unrolled loop 4 pixels */ |
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496 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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497 double_pixel_copy_increment, \ |
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498 quatro_pixel_copy_increment, width) \ |
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499 { int n, w = width; \ |
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500 if(w & 1) { \ |
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501 pixel_copy_increment; \ |
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502 w--; \ |
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503 } \ |
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504 if(w & 2) { \ |
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505 double_pixel_copy_increment; \ |
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506 w -= 2; \ |
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507 } \ |
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508 if ( w > 0 ) { \ |
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509 n = ( w + 7 ) / 8; \ |
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510 switch( w & 4 ) { \ |
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511 case 0: do { quatro_pixel_copy_increment; \ |
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512 case 4: quatro_pixel_copy_increment; \ |
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513 } while ( --n > 0 ); \ |
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514 } \ |
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515 } \ |
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516 } |
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517 |
| 0 | 518 /* Use the 8-times version of the loop by default */ |
| 519 #define DUFFS_LOOP(pixel_copy_increment, width) \ | |
| 520 DUFFS_LOOP8(pixel_copy_increment, width) | |
| 521 | |
| 522 #else | |
| 523 | |
| 524 /* Don't use Duff's device to unroll loops */ | |
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525 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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526 double_pixel_copy_increment, width) \ |
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527 { int n = width; \ |
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528 if( n & 1 ) { \ |
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529 pixel_copy_increment; \ |
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530 n--; \ |
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531 } \ |
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532 n=n>>1; \ |
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533 for(; n > 0; --n) { \ |
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534 double_pixel_copy_increment; \ |
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535 } \ |
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536 } |
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537 |
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538 /* Don't use Duff's device to unroll loops */ |
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539 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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540 double_pixel_copy_increment, \ |
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541 quatro_pixel_copy_increment, width) \ |
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542 { int n = width; \ |
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543 if(n & 1) { \ |
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544 pixel_copy_increment; \ |
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545 n--; \ |
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546 } \ |
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547 if(n & 2) { \ |
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548 double_pixel_copy_increment; \ |
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549 n -= 2; \ |
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550 } \ |
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551 n=n>>2; \ |
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552 for(; n > 0; --n) { \ |
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553 quatro_pixel_copy_increment; \ |
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554 } \ |
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555 } |
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556 |
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557 /* Don't use Duff's device to unroll loops */ |
| 0 | 558 #define DUFFS_LOOP(pixel_copy_increment, width) \ |
| 559 { int n; \ | |
| 560 for ( n=width; n > 0; --n ) { \ | |
| 561 pixel_copy_increment; \ | |
| 562 } \ | |
| 563 } | |
| 564 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 565 DUFFS_LOOP(pixel_copy_increment, width) | |
| 566 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 567 DUFFS_LOOP(pixel_copy_increment, width) | |
| 568 | |
| 569 #endif /* USE_DUFFS_LOOP */ | |
| 570 | |
| 571 /* Prevent Visual C++ 6.0 from printing out stupid warnings */ | |
| 572 #if defined(_MSC_VER) && (_MSC_VER >= 600) | |
| 573 #pragma warning(disable: 4550) | |
| 574 #endif | |
| 575 | |
| 576 #endif /* _SDL_blit_h */ | |
|
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577 /* vi: set ts=4 sw=4 expandtab: */ |