Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.c @ 1330:450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
using Visual C++ 2005
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 06 Feb 2006 08:28:51 +0000 |
| parents | c9b51268668f |
| children | c71e05b4dc2e |
| 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 */ |
| 22 | |
| 23 #include "SDL_error.h" | |
| 24 #include "SDL_video.h" | |
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25 #include "SDL_string.h" |
| 0 | 26 #include "SDL_sysvideo.h" |
| 27 #include "SDL_blit.h" | |
| 28 #include "SDL_RLEaccel_c.h" | |
| 29 #include "SDL_pixels_c.h" | |
| 30 | |
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31 #if (defined(i386) || defined(__x86_64__)) && defined(__GNUC__) && defined(USE_ASMBLIT) |
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32 #define MMX_ASMBLIT |
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33 #endif |
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34 |
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35 #if defined(MMX_ASMBLIT) |
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36 #include "SDL_cpuinfo.h" |
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37 #include "mmx.h" |
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38 #endif |
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39 |
| 0 | 40 /* The general purpose software blit routine */ |
| 41 static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 42 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 43 { | |
| 44 int okay; | |
| 45 int src_locked; | |
| 46 int dst_locked; | |
| 47 | |
| 48 /* Everything is okay at the beginning... */ | |
| 49 okay = 1; | |
| 50 | |
| 51 /* Lock the destination if it's in hardware */ | |
| 52 dst_locked = 0; | |
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53 if ( SDL_MUSTLOCK(dst) ) { |
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54 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 55 okay = 0; |
| 56 } else { | |
| 57 dst_locked = 1; | |
| 58 } | |
| 59 } | |
| 60 /* Lock the source if it's in hardware */ | |
| 61 src_locked = 0; | |
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62 if ( SDL_MUSTLOCK(src) ) { |
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63 if ( SDL_LockSurface(src) < 0 ) { |
| 0 | 64 okay = 0; |
| 65 } else { | |
| 66 src_locked = 1; | |
| 67 } | |
| 68 } | |
| 69 | |
| 70 /* Set up source and destination buffer pointers, and BLIT! */ | |
| 71 if ( okay && srcrect->w && srcrect->h ) { | |
| 72 SDL_BlitInfo info; | |
| 73 SDL_loblit RunBlit; | |
| 74 | |
| 75 /* Set up the blit information */ | |
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76 info.s_pixels = (Uint8 *)src->pixels + |
| 0 | 77 (Uint16)srcrect->y*src->pitch + |
| 78 (Uint16)srcrect->x*src->format->BytesPerPixel; | |
| 79 info.s_width = srcrect->w; | |
| 80 info.s_height = srcrect->h; | |
| 81 info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel; | |
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82 info.d_pixels = (Uint8 *)dst->pixels + |
| 0 | 83 (Uint16)dstrect->y*dst->pitch + |
| 84 (Uint16)dstrect->x*dst->format->BytesPerPixel; | |
| 85 info.d_width = dstrect->w; | |
| 86 info.d_height = dstrect->h; | |
| 87 info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel; | |
| 88 info.aux_data = src->map->sw_data->aux_data; | |
| 89 info.src = src->format; | |
| 90 info.table = src->map->table; | |
| 91 info.dst = dst->format; | |
| 92 RunBlit = src->map->sw_data->blit; | |
| 93 | |
| 94 /* Run the actual software blit */ | |
| 95 RunBlit(&info); | |
| 96 } | |
| 97 | |
| 98 /* We need to unlock the surfaces if they're locked */ | |
| 99 if ( dst_locked ) { | |
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100 SDL_UnlockSurface(dst); |
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101 } |
| 0 | 102 if ( src_locked ) { |
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103 SDL_UnlockSurface(src); |
| 0 | 104 } |
| 105 /* Blit is done! */ | |
| 106 return(okay ? 0 : -1); | |
| 107 } | |
| 108 | |
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109 #ifdef MMX_ASMBLIT |
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110 static __inline__ void SDL_memcpyMMX(Uint8 *to, const Uint8 *from, int len) |
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111 { |
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112 int i; |
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113 |
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114 for(i=0; i<len/8; i++) { |
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115 __asm__ __volatile__ ( |
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116 " movq (%0), %%mm0\n" |
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117 " movq %%mm0, (%1)\n" |
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118 : : "r" (from), "r" (to) : "memory"); |
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119 from+=8; |
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120 to+=8; |
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121 } |
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122 if (len&7) |
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123 SDL_memcpy(to, from, len&7); |
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124 } |
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125 |
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126 static __inline__ void SDL_memcpySSE(Uint8 *to, const Uint8 *from, int len) |
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127 { |
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128 int i; |
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129 |
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130 __asm__ __volatile__ ( |
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131 " prefetchnta (%0)\n" |
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132 " prefetchnta 64(%0)\n" |
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133 " prefetchnta 128(%0)\n" |
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134 " prefetchnta 192(%0)\n" |
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135 : : "r" (from) ); |
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136 |
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137 for(i=0; i<len/8; i++) { |
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138 __asm__ __volatile__ ( |
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139 " prefetchnta 256(%0)\n" |
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140 " movq (%0), %%mm0\n" |
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141 " movntq %%mm0, (%1)\n" |
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142 : : "r" (from), "r" (to) : "memory"); |
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143 from+=8; |
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144 to+=8; |
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145 } |
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146 if (len&7) |
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147 SDL_memcpy(to, from, len&7); |
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148 } |
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149 #endif |
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150 |
| 0 | 151 static void SDL_BlitCopy(SDL_BlitInfo *info) |
| 152 { | |
| 153 Uint8 *src, *dst; | |
| 154 int w, h; | |
| 155 int srcskip, dstskip; | |
| 156 | |
| 157 w = info->d_width*info->dst->BytesPerPixel; | |
| 158 h = info->d_height; | |
| 159 src = info->s_pixels; | |
| 160 dst = info->d_pixels; | |
| 161 srcskip = w+info->s_skip; | |
| 162 dstskip = w+info->d_skip; | |
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163 #ifdef MMX_ASMBLIT |
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164 if(SDL_HasSSE()) |
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165 { |
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166 while ( h-- ) { |
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167 SDL_memcpySSE(dst, src, w); |
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168 src += srcskip; |
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169 dst += dstskip; |
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170 } |
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171 __asm__ __volatile__ ( |
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172 " emms\n" |
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173 ::); |
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174 } |
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175 else |
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176 if(SDL_HasMMX()) |
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177 { |
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178 while ( h-- ) { |
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179 SDL_memcpyMMX(dst, src, w); |
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180 src += srcskip; |
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181 dst += dstskip; |
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182 } |
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183 __asm__ __volatile__ ( |
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184 " emms\n" |
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185 ::); |
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186 } |
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187 else |
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188 #endif |
| 0 | 189 while ( h-- ) { |
| 190 SDL_memcpy(dst, src, w); | |
| 191 src += srcskip; | |
| 192 dst += dstskip; | |
| 193 } | |
| 194 } | |
| 195 | |
| 196 static void SDL_BlitCopyOverlap(SDL_BlitInfo *info) | |
| 197 { | |
| 198 Uint8 *src, *dst; | |
| 199 int w, h; | |
| 200 int srcskip, dstskip; | |
| 201 | |
| 202 w = info->d_width*info->dst->BytesPerPixel; | |
| 203 h = info->d_height; | |
| 204 src = info->s_pixels; | |
| 205 dst = info->d_pixels; | |
| 206 srcskip = w+info->s_skip; | |
| 207 dstskip = w+info->d_skip; | |
| 208 if ( dst < src ) { | |
| 209 while ( h-- ) { | |
| 210 SDL_memcpy(dst, src, w); | |
| 211 src += srcskip; | |
| 212 dst += dstskip; | |
| 213 } | |
| 214 } else { | |
| 215 src += ((h-1) * srcskip); | |
| 216 dst += ((h-1) * dstskip); | |
| 217 while ( h-- ) { | |
| 218 SDL_revcpy(dst, src, w); | |
| 219 src -= srcskip; | |
| 220 dst -= dstskip; | |
| 221 } | |
| 222 } | |
| 223 } | |
| 224 | |
| 225 /* Figure out which of many blit routines to set up on a surface */ | |
| 226 int SDL_CalculateBlit(SDL_Surface *surface) | |
| 227 { | |
| 228 int blit_index; | |
| 229 | |
| 230 /* Clean everything out to start */ | |
| 231 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 232 SDL_UnRLESurface(surface, 1); | |
| 233 } | |
| 234 surface->map->sw_blit = NULL; | |
| 235 | |
| 236 /* Figure out if an accelerated hardware blit is possible */ | |
| 237 surface->flags &= ~SDL_HWACCEL; | |
| 238 if ( surface->map->identity ) { | |
| 239 int hw_blit_ok; | |
| 240 | |
| 241 if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { | |
| 242 /* We only support accelerated blitting to hardware */ | |
| 243 if ( surface->map->dst->flags & SDL_HWSURFACE ) { | |
| 244 hw_blit_ok = current_video->info.blit_hw; | |
| 245 } else { | |
| 246 hw_blit_ok = 0; | |
| 247 } | |
| 248 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { | |
| 249 hw_blit_ok = current_video->info.blit_hw_CC; | |
| 250 } | |
| 251 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { | |
| 252 hw_blit_ok = current_video->info.blit_hw_A; | |
| 253 } | |
| 254 } else { | |
| 255 /* We only support accelerated blitting to hardware */ | |
| 256 if ( surface->map->dst->flags & SDL_HWSURFACE ) { | |
| 257 hw_blit_ok = current_video->info.blit_sw; | |
| 258 } else { | |
| 259 hw_blit_ok = 0; | |
| 260 } | |
| 261 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { | |
| 262 hw_blit_ok = current_video->info.blit_sw_CC; | |
| 263 } | |
| 264 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { | |
| 265 hw_blit_ok = current_video->info.blit_sw_A; | |
| 266 } | |
| 267 } | |
| 268 if ( hw_blit_ok ) { | |
| 269 SDL_VideoDevice *video = current_video; | |
| 270 SDL_VideoDevice *this = current_video; | |
| 271 video->CheckHWBlit(this, surface, surface->map->dst); | |
| 272 } | |
| 273 } | |
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274 |
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275 /* if an alpha pixel format is specified, we can accelerate alpha blits */ |
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276 if (((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE )&&(current_video->displayformatalphapixel)) |
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277 { |
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278 if ( (surface->flags & SDL_SRCALPHA) ) |
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279 if ( current_video->info.blit_hw_A ) { |
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280 SDL_VideoDevice *video = current_video; |
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281 SDL_VideoDevice *this = current_video; |
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282 video->CheckHWBlit(this, surface, surface->map->dst); |
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283 } |
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284 } |
| 0 | 285 |
| 286 /* Get the blit function index, based on surface mode */ | |
| 287 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */ | |
| 288 blit_index = 0; | |
| 289 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0; | |
| 290 if ( surface->flags & SDL_SRCALPHA | |
| 291 && (surface->format->alpha != SDL_ALPHA_OPAQUE | |
| 292 || surface->format->Amask) ) { | |
| 293 blit_index |= 2; | |
| 294 } | |
| 295 | |
| 296 /* Check for special "identity" case -- copy blit */ | |
| 297 if ( surface->map->identity && blit_index == 0 ) { | |
| 298 surface->map->sw_data->blit = SDL_BlitCopy; | |
| 299 | |
| 300 /* Handle overlapping blits on the same surface */ | |
| 301 if ( surface == surface->map->dst ) { | |
| 302 surface->map->sw_data->blit = SDL_BlitCopyOverlap; | |
| 303 } | |
| 304 } else { | |
| 305 if ( surface->format->BitsPerPixel < 8 ) { | |
| 306 surface->map->sw_data->blit = | |
| 307 SDL_CalculateBlit0(surface, blit_index); | |
| 308 } else { | |
| 309 switch ( surface->format->BytesPerPixel ) { | |
| 310 case 1: | |
| 311 surface->map->sw_data->blit = | |
| 312 SDL_CalculateBlit1(surface, blit_index); | |
| 313 break; | |
| 314 case 2: | |
| 315 case 3: | |
| 316 case 4: | |
| 317 surface->map->sw_data->blit = | |
| 318 SDL_CalculateBlitN(surface, blit_index); | |
| 319 break; | |
| 320 default: | |
| 321 surface->map->sw_data->blit = NULL; | |
| 322 break; | |
| 323 } | |
| 324 } | |
| 325 } | |
| 326 /* Make sure we have a blit function */ | |
| 327 if ( surface->map->sw_data->blit == NULL ) { | |
| 328 SDL_InvalidateMap(surface->map); | |
| 329 SDL_SetError("Blit combination not supported"); | |
| 330 return(-1); | |
| 331 } | |
| 332 | |
| 333 /* Choose software blitting function */ | |
| 334 if(surface->flags & SDL_RLEACCELOK | |
| 335 && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) { | |
| 336 | |
| 337 if(surface->map->identity | |
| 338 && (blit_index == 1 | |
| 339 || (blit_index == 3 && !surface->format->Amask))) { | |
| 340 if ( SDL_RLESurface(surface) == 0 ) | |
| 341 surface->map->sw_blit = SDL_RLEBlit; | |
| 342 } else if(blit_index == 2 && surface->format->Amask) { | |
| 343 if ( SDL_RLESurface(surface) == 0 ) | |
| 344 surface->map->sw_blit = SDL_RLEAlphaBlit; | |
| 345 } | |
| 346 } | |
| 347 | |
| 348 if ( surface->map->sw_blit == NULL ) { | |
| 349 surface->map->sw_blit = SDL_SoftBlit; | |
| 350 } | |
| 351 return(0); | |
| 352 } | |
| 353 |