Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.h @ 2898:e40448bc7727
Share code between fill and line drawing
Added general RGB surface format fallbacks to drawing code
Fixed issues with destination surface alpha channel
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 21 Dec 2008 08:28:25 +0000 |
| parents | 99210400e8b9 |
| children | a0c837a16e4c |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 2859 | 3 Copyright (C) 1997-2009 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" |
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42 #include "SDL_video.h" |
| 0 | 43 |
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44 /* SDL blit copy flags */ |
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45 #define SDL_COPY_MODULATE_COLOR 0x00000001 |
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46 #define SDL_COPY_MODULATE_ALPHA 0x00000002 |
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47 #define SDL_COPY_MASK 0x00000010 |
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48 #define SDL_COPY_BLEND 0x00000020 |
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49 #define SDL_COPY_ADD 0x00000040 |
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50 #define SDL_COPY_MOD 0x00000080 |
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51 #define SDL_COPY_COLORKEY 0x00000100 |
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52 #define SDL_COPY_NEAREST 0x00000200 |
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53 #define SDL_COPY_RLE_DESIRED 0x00001000 |
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54 #define SDL_COPY_RLE_COLORKEY 0x00002000 |
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55 #define SDL_COPY_RLE_ALPHAKEY 0x00004000 |
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56 #define SDL_COPY_RLE_MASK (SDL_COPY_RLE_DESIRED|SDL_COPY_RLE_COLORKEY|SDL_COPY_RLE_ALPHAKEY) |
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57 |
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58 /* SDL blit CPU flags */ |
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59 #define SDL_CPU_ANY 0x00000000 |
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60 #define SDL_CPU_MMX 0x00000001 |
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61 #define SDL_CPU_3DNOW 0x00000002 |
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62 #define SDL_CPU_SSE 0x00000004 |
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63 #define SDL_CPU_SSE2 0x00000008 |
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64 #define SDL_CPU_ALTIVEC_PREFETCH 0x00000010 |
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65 #define SDL_CPU_ALTIVEC_NOPREFETCH 0x00000020 |
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66 |
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67 typedef struct |
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68 { |
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69 Uint8 *src; |
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70 int src_w, src_h; |
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71 int src_pitch; |
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72 int src_skip; |
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73 Uint8 *dst; |
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74 int dst_w, dst_h; |
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75 int dst_pitch; |
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76 int dst_skip; |
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77 SDL_PixelFormat *src_fmt; |
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78 SDL_PixelFormat *dst_fmt; |
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79 Uint8 *table; |
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80 int flags; |
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81 Uint32 colorkey; |
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82 Uint8 r, g, b, a; |
| 0 | 83 } SDL_BlitInfo; |
| 84 | |
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85 typedef void (SDLCALL * SDL_BlitFunc) (SDL_BlitInfo * info); |
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86 |
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87 typedef struct |
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88 { |
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89 Uint32 src_format; |
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90 Uint32 dst_format; |
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91 int flags; |
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92 int cpu; |
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93 SDL_BlitFunc func; |
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94 } SDL_BlitFuncEntry; |
| 0 | 95 |
| 96 /* Blit mapping definition */ | |
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97 typedef struct SDL_BlitMap |
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98 { |
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99 SDL_Surface *dst; |
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100 int identity; |
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101 SDL_blit blit; |
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102 void *data; |
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103 SDL_BlitInfo info; |
| 0 | 104 |
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105 /* the version count matches the destination; mismatch indicates |
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106 an invalid mapping */ |
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107 unsigned int format_version; |
| 0 | 108 } SDL_BlitMap; |
| 109 | |
| 110 /* Functions found in SDL_blit.c */ | |
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111 extern int SDL_CalculateBlit(SDL_Surface * surface); |
| 0 | 112 |
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113 /* Functions found in SDL_blit_*.c */ |
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114 extern SDL_BlitFunc SDL_CalculateBlit0(SDL_Surface * surface); |
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115 extern SDL_BlitFunc SDL_CalculateBlit1(SDL_Surface * surface); |
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116 extern SDL_BlitFunc SDL_CalculateBlitN(SDL_Surface * surface); |
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117 extern SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface * surface); |
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118 |
| 0 | 119 /* |
| 120 * Useful macros for blitting routines | |
| 121 */ | |
| 122 | |
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123 #if defined(__GNUC__) |
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124 #define DECLARE_ALIGNED(t,v,a) t __attribute__((aligned(a))) v |
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125 #elif defined(_MSC_VER) |
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126 #define DECLARE_ALIGNED(t,v,a) __declspec(align(a)) t v |
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127 #else |
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128 #define DECLARE_ALIGNED(t,v,a) t v |
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129 #endif |
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130 |
| 0 | 131 #define FORMAT_EQUAL(A, B) \ |
| 132 ((A)->BitsPerPixel == (B)->BitsPerPixel \ | |
| 133 && ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask)) | |
| 134 | |
| 135 /* Load pixel of the specified format from a buffer and get its R-G-B values */ | |
| 136 /* FIXME: rescale values to 0..255 here? */ | |
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137 #define RGB_FROM_PIXEL(Pixel, fmt, r, g, b) \ |
| 0 | 138 { \ |
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139 r = (((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); \ |
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140 g = (((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); \ |
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141 b = (((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); \ |
| 0 | 142 } |
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143 #define RGB_FROM_RGB565(Pixel, r, g, b) \ |
| 0 | 144 { \ |
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145 r = (((Pixel&0xF800)>>11)<<3); \ |
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146 g = (((Pixel&0x07E0)>>5)<<2); \ |
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147 b = ((Pixel&0x001F)<<3); \ |
| 0 | 148 } |
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149 #define RGB_FROM_RGB555(Pixel, r, g, b) \ |
| 0 | 150 { \ |
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151 r = (((Pixel&0x7C00)>>10)<<3); \ |
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152 g = (((Pixel&0x03E0)>>5)<<3); \ |
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153 b = ((Pixel&0x001F)<<3); \ |
| 0 | 154 } |
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155 #define RGB_FROM_RGB888(Pixel, r, g, b) \ |
| 0 | 156 { \ |
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157 r = ((Pixel&0xFF0000)>>16); \ |
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158 g = ((Pixel&0xFF00)>>8); \ |
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159 b = (Pixel&0xFF); \ |
| 0 | 160 } |
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161 #define RETRIEVE_RGB_PIXEL(buf, bpp, Pixel) \ |
| 0 | 162 do { \ |
| 163 switch (bpp) { \ | |
| 164 case 2: \ | |
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165 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 166 break; \ |
| 167 \ | |
| 168 case 3: { \ | |
| 169 Uint8 *B = (Uint8 *)(buf); \ | |
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170 if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
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171 Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ |
| 0 | 172 } else { \ |
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173 Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ |
| 0 | 174 } \ |
| 175 } \ | |
| 176 break; \ | |
| 177 \ | |
| 178 case 4: \ | |
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179 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 180 break; \ |
| 181 \ | |
| 182 default: \ | |
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183 Pixel; /* stop gcc complaints */ \ |
| 0 | 184 break; \ |
| 185 } \ | |
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186 } while (0) |
| 0 | 187 |
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188 #define DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b) \ |
| 0 | 189 do { \ |
| 190 switch (bpp) { \ | |
| 191 case 2: \ | |
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192 Pixel = *((Uint16 *)(buf)); \ |
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193 RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \ |
| 0 | 194 break; \ |
| 195 \ | |
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196 case 3: { \ |
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197 if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
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198 r = *((buf)+fmt->Rshift/8); \ |
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199 g = *((buf)+fmt->Gshift/8); \ |
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200 b = *((buf)+fmt->Bshift/8); \ |
| 0 | 201 } else { \ |
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202 r = *((buf)+2-fmt->Rshift/8); \ |
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203 g = *((buf)+2-fmt->Gshift/8); \ |
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204 b = *((buf)+2-fmt->Bshift/8); \ |
| 0 | 205 } \ |
| 206 } \ | |
| 207 break; \ | |
| 208 \ | |
| 209 case 4: \ | |
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210 Pixel = *((Uint32 *)(buf)); \ |
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211 RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \ |
| 0 | 212 break; \ |
| 213 \ | |
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214 default: \ |
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215 Pixel; /* stop gcc complaints */ \ |
| 0 | 216 break; \ |
| 217 } \ | |
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218 } while (0) |
| 0 | 219 |
| 220 /* Assemble R-G-B values into a specified pixel format and store them */ | |
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221 #define PIXEL_FROM_RGB(Pixel, fmt, r, g, b) \ |
| 0 | 222 { \ |
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223 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
| 0 | 224 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
| 225 ((b>>fmt->Bloss)<<fmt->Bshift); \ | |
| 226 } | |
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227 #define RGB565_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 228 { \ |
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229 Pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3); \ |
| 0 | 230 } |
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231 #define RGB555_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 232 { \ |
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233 Pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3); \ |
| 0 | 234 } |
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235 #define RGB888_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 236 { \ |
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237 Pixel = (r<<16)|(g<<8)|b; \ |
| 0 | 238 } |
| 239 #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \ | |
| 240 { \ | |
| 241 switch (bpp) { \ | |
| 242 case 2: { \ | |
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243 Uint16 Pixel; \ |
| 0 | 244 \ |
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245 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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246 *((Uint16 *)(buf)) = Pixel; \ |
| 0 | 247 } \ |
| 248 break; \ | |
| 249 \ | |
| 250 case 3: { \ | |
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251 if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
| 0 | 252 *((buf)+fmt->Rshift/8) = r; \ |
| 253 *((buf)+fmt->Gshift/8) = g; \ | |
| 254 *((buf)+fmt->Bshift/8) = b; \ | |
| 255 } else { \ | |
| 256 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 257 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 258 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 259 } \ | |
| 260 } \ | |
| 261 break; \ | |
| 262 \ | |
| 263 case 4: { \ | |
|
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264 Uint32 Pixel; \ |
| 0 | 265 \ |
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266 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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267 *((Uint32 *)(buf)) = Pixel; \ |
| 0 | 268 } \ |
| 269 break; \ | |
| 270 } \ | |
| 271 } | |
| 272 #define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask) \ | |
| 273 { \ | |
| 274 switch (bpp) { \ | |
| 275 case 2: { \ | |
| 276 Uint16 *bufp; \ | |
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277 Uint16 Pixel; \ |
| 0 | 278 \ |
| 279 bufp = (Uint16 *)buf; \ | |
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280 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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281 *bufp = Pixel | (*bufp & Amask); \ |
| 0 | 282 } \ |
| 283 break; \ | |
| 284 \ | |
| 285 case 3: { \ | |
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286 if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
| 0 | 287 *((buf)+fmt->Rshift/8) = r; \ |
| 288 *((buf)+fmt->Gshift/8) = g; \ | |
| 289 *((buf)+fmt->Bshift/8) = b; \ | |
| 290 } else { \ | |
| 291 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 292 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 293 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 294 } \ | |
| 295 } \ | |
| 296 break; \ | |
| 297 \ | |
| 298 case 4: { \ | |
| 299 Uint32 *bufp; \ | |
|
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300 Uint32 Pixel; \ |
| 0 | 301 \ |
| 302 bufp = (Uint32 *)buf; \ | |
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303 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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304 *bufp = Pixel | (*bufp & Amask); \ |
| 0 | 305 } \ |
| 306 break; \ | |
| 307 } \ | |
| 308 } | |
| 309 | |
| 310 /* FIXME: Should we rescale alpha into 0..255 here? */ | |
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311 #define RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a) \ |
| 0 | 312 { \ |
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313 r = ((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; \ |
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314 g = ((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; \ |
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315 b = ((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \ |
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316 a = ((Pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \ |
| 0 | 317 } |
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318 #define RGBA_FROM_8888(Pixel, fmt, r, g, b, a) \ |
| 0 | 319 { \ |
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320 r = (Pixel&fmt->Rmask)>>fmt->Rshift; \ |
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321 g = (Pixel&fmt->Gmask)>>fmt->Gshift; \ |
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322 b = (Pixel&fmt->Bmask)>>fmt->Bshift; \ |
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323 a = (Pixel&fmt->Amask)>>fmt->Ashift; \ |
| 0 | 324 } |
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325 #define RGBA_FROM_RGBA8888(Pixel, r, g, b, a) \ |
| 0 | 326 { \ |
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327 r = (Pixel>>24); \ |
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328 g = ((Pixel>>16)&0xFF); \ |
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329 b = ((Pixel>>8)&0xFF); \ |
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330 a = (Pixel&0xFF); \ |
| 0 | 331 } |
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332 #define RGBA_FROM_ARGB8888(Pixel, r, g, b, a) \ |
| 0 | 333 { \ |
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334 r = ((Pixel>>16)&0xFF); \ |
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335 g = ((Pixel>>8)&0xFF); \ |
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336 b = (Pixel&0xFF); \ |
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337 a = (Pixel>>24); \ |
| 0 | 338 } |
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339 #define RGBA_FROM_ABGR8888(Pixel, r, g, b, a) \ |
| 0 | 340 { \ |
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341 r = (Pixel&0xFF); \ |
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342 g = ((Pixel>>8)&0xFF); \ |
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343 b = ((Pixel>>16)&0xFF); \ |
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344 a = (Pixel>>24); \ |
| 0 | 345 } |
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346 #define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a) \ |
| 0 | 347 do { \ |
| 348 switch (bpp) { \ | |
| 349 case 2: \ | |
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350 Pixel = *((Uint16 *)(buf)); \ |
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351 RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \ |
| 0 | 352 break; \ |
| 353 \ | |
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354 case 3: { \ |
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355 if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
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356 r = *((buf)+fmt->Rshift/8); \ |
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357 g = *((buf)+fmt->Gshift/8); \ |
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358 b = *((buf)+fmt->Bshift/8); \ |
| 0 | 359 } else { \ |
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360 r = *((buf)+2-fmt->Rshift/8); \ |
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361 g = *((buf)+2-fmt->Gshift/8); \ |
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362 b = *((buf)+2-fmt->Bshift/8); \ |
| 0 | 363 } \ |
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364 a = 0xFF; \ |
| 0 | 365 } \ |
| 366 break; \ | |
| 367 \ | |
| 368 case 4: \ | |
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369 Pixel = *((Uint32 *)(buf)); \ |
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370 RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \ |
| 0 | 371 break; \ |
| 372 \ | |
| 373 default: \ | |
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374 Pixel; /* stop gcc complaints */ \ |
| 0 | 375 break; \ |
| 376 } \ | |
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377 } while (0) |
| 0 | 378 |
| 379 /* FIXME: this isn't correct, especially for Alpha (maximum != 255) */ | |
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380 #define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a) \ |
| 0 | 381 { \ |
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382 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
| 0 | 383 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
| 384 ((b>>fmt->Bloss)<<fmt->Bshift)| \ | |
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385 ((a>>fmt->Aloss)<<fmt->Ashift); \ |
| 0 | 386 } |
| 387 #define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \ | |
| 388 { \ | |
| 389 switch (bpp) { \ | |
| 390 case 2: { \ | |
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391 Uint16 Pixel; \ |
| 0 | 392 \ |
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393 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \ |
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394 *((Uint16 *)(buf)) = Pixel; \ |
| 0 | 395 } \ |
| 396 break; \ | |
| 397 \ | |
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398 case 3: { \ |
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399 if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
| 0 | 400 *((buf)+fmt->Rshift/8) = r; \ |
| 401 *((buf)+fmt->Gshift/8) = g; \ | |
| 402 *((buf)+fmt->Bshift/8) = b; \ | |
| 403 } else { \ | |
| 404 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 405 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 406 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 407 } \ | |
| 408 } \ | |
| 409 break; \ | |
| 410 \ | |
| 411 case 4: { \ | |
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412 Uint32 Pixel; \ |
| 0 | 413 \ |
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414 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \ |
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415 *((Uint32 *)(buf)) = Pixel; \ |
| 0 | 416 } \ |
| 417 break; \ | |
| 418 } \ | |
| 419 } | |
| 420 | |
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421 /* Blend the RGB values of two Pixels based on a source alpha value */ |
| 0 | 422 #define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \ |
| 423 do { \ | |
| 424 dR = (((sR-dR)*(A))>>8)+dR; \ | |
| 425 dG = (((sG-dG)*(A))>>8)+dG; \ | |
| 426 dB = (((sB-dB)*(A))>>8)+dB; \ | |
| 427 } while(0) | |
| 428 | |
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429 /* Blend the RGB values of two Pixels based on a source alpha value */ |
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430 #define ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB) \ |
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431 do { \ |
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432 unsigned tR, tG, tB, tA; \ |
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433 tA = 255 - sA; \ |
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434 tR = 1 + (sR * sA) + (dR * tA); \ |
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435 dR = (tR + (tR >> 8)) >> 8; \ |
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436 tG = 1 + (sG * sA) + (dG * tA); \ |
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437 dG = (tG + (tG >> 8)) >> 8; \ |
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438 tB = 1 + (sB * sA) + (dB * tA); \ |
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439 dB = (tB + (tB >> 8)) >> 8; \ |
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440 } while(0) |
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441 |
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442 |
| 0 | 443 /* This is a very useful loop for optimizing blitters */ |
|
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444 #if defined(_MSC_VER) && (_MSC_VER == 1300) |
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445 /* There's a bug in the Visual C++ 7 optimizer when compiling this code */ |
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446 #else |
| 0 | 447 #define USE_DUFFS_LOOP |
|
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448 #endif |
| 0 | 449 #ifdef USE_DUFFS_LOOP |
| 450 | |
| 451 /* 8-times unrolled loop */ | |
| 452 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 453 { int n = (width+7)/8; \ | |
|
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454 switch (width & 7) { \ |
| 0 | 455 case 0: do { pixel_copy_increment; \ |
| 456 case 7: pixel_copy_increment; \ | |
| 457 case 6: pixel_copy_increment; \ | |
| 458 case 5: pixel_copy_increment; \ | |
| 459 case 4: pixel_copy_increment; \ | |
| 460 case 3: pixel_copy_increment; \ | |
| 461 case 2: pixel_copy_increment; \ | |
| 462 case 1: pixel_copy_increment; \ | |
| 463 } while ( --n > 0 ); \ | |
| 464 } \ | |
| 465 } | |
| 466 | |
| 467 /* 4-times unrolled loop */ | |
| 468 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 469 { int n = (width+3)/4; \ | |
|
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470 switch (width & 3) { \ |
| 0 | 471 case 0: do { pixel_copy_increment; \ |
| 472 case 3: pixel_copy_increment; \ | |
| 473 case 2: pixel_copy_increment; \ | |
| 474 case 1: pixel_copy_increment; \ | |
| 475 } while ( --n > 0 ); \ | |
| 476 } \ | |
| 477 } | |
| 478 | |
|
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479 /* 2 - times unrolled loop */ |
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480 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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481 double_pixel_copy_increment, width) \ |
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482 { int n, w = width; \ |
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483 if( w & 1 ) { \ |
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484 pixel_copy_increment; \ |
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485 w--; \ |
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486 } \ |
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487 if ( w > 0 ) { \ |
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488 n = ( w + 2) / 4; \ |
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489 switch( w & 2 ) { \ |
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490 case 0: do { double_pixel_copy_increment; \ |
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491 case 2: double_pixel_copy_increment; \ |
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492 } while ( --n > 0 ); \ |
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493 } \ |
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494 } \ |
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495 } |
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496 |
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497 /* 2 - times unrolled loop 4 pixels */ |
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498 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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499 double_pixel_copy_increment, \ |
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500 quatro_pixel_copy_increment, width) \ |
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501 { int n, w = width; \ |
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502 if(w & 1) { \ |
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503 pixel_copy_increment; \ |
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504 w--; \ |
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505 } \ |
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506 if(w & 2) { \ |
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507 double_pixel_copy_increment; \ |
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508 w -= 2; \ |
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509 } \ |
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510 if ( w > 0 ) { \ |
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511 n = ( w + 7 ) / 8; \ |
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512 switch( w & 4 ) { \ |
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513 case 0: do { quatro_pixel_copy_increment; \ |
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514 case 4: quatro_pixel_copy_increment; \ |
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515 } while ( --n > 0 ); \ |
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516 } \ |
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517 } \ |
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518 } |
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519 |
| 0 | 520 /* Use the 8-times version of the loop by default */ |
| 521 #define DUFFS_LOOP(pixel_copy_increment, width) \ | |
| 522 DUFFS_LOOP8(pixel_copy_increment, width) | |
| 523 | |
| 524 #else | |
| 525 | |
| 526 /* Don't use Duff's device to unroll loops */ | |
|
689
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527 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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528 double_pixel_copy_increment, width) \ |
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529 { int n = width; \ |
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530 if( n & 1 ) { \ |
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531 pixel_copy_increment; \ |
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532 n--; \ |
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533 } \ |
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534 n=n>>1; \ |
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535 for(; n > 0; --n) { \ |
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536 double_pixel_copy_increment; \ |
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537 } \ |
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538 } |
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539 |
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540 /* Don't use Duff's device to unroll loops */ |
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541 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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542 double_pixel_copy_increment, \ |
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543 quatro_pixel_copy_increment, width) \ |
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544 { int n = width; \ |
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545 if(n & 1) { \ |
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546 pixel_copy_increment; \ |
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547 n--; \ |
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548 } \ |
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549 if(n & 2) { \ |
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550 double_pixel_copy_increment; \ |
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551 n -= 2; \ |
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552 } \ |
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553 n=n>>2; \ |
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554 for(; n > 0; --n) { \ |
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555 quatro_pixel_copy_increment; \ |
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556 } \ |
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557 } |
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558 |
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559 /* Don't use Duff's device to unroll loops */ |
| 0 | 560 #define DUFFS_LOOP(pixel_copy_increment, width) \ |
| 561 { int n; \ | |
| 562 for ( n=width; n > 0; --n ) { \ | |
| 563 pixel_copy_increment; \ | |
| 564 } \ | |
| 565 } | |
| 566 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 567 DUFFS_LOOP(pixel_copy_increment, width) | |
| 568 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 569 DUFFS_LOOP(pixel_copy_increment, width) | |
| 570 | |
| 571 #endif /* USE_DUFFS_LOOP */ | |
| 572 | |
| 573 /* Prevent Visual C++ 6.0 from printing out stupid warnings */ | |
| 574 #if defined(_MSC_VER) && (_MSC_VER >= 600) | |
| 575 #pragma warning(disable: 4550) | |
| 576 #endif | |
| 577 | |
| 578 #endif /* _SDL_blit_h */ | |
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Share code between fill and line drawing
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579 |
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580 /* vi: set ts=4 sw=4 expandtab: */ |