Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.c @ 1605:b70cce8d7f62
Fixed bug #175
Removed obsolete .cvsignore files... whee!
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 23 Mar 2006 21:39:58 +0000 |
| parents | d910939febfa |
| children | e49147870aac c121d94672cb 6832b00d3594 |
| 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 #include "SDL_video.h" | |
| 25 #include "SDL_sysvideo.h" | |
| 26 #include "SDL_blit.h" | |
| 27 #include "SDL_RLEaccel_c.h" | |
| 28 #include "SDL_pixels_c.h" | |
| 29 | |
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30 #if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) && SDL_ASSEMBLY_ROUTINES |
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31 #define MMX_ASMBLIT |
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32 #endif |
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33 |
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34 #if defined(MMX_ASMBLIT) |
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35 #include "SDL_cpuinfo.h" |
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36 #include "mmx.h" |
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37 #endif |
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38 |
| 0 | 39 /* The general purpose software blit routine */ |
| 40 static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 41 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 42 { | |
| 43 int okay; | |
| 44 int src_locked; | |
| 45 int dst_locked; | |
| 46 | |
| 47 /* Everything is okay at the beginning... */ | |
| 48 okay = 1; | |
| 49 | |
| 50 /* Lock the destination if it's in hardware */ | |
| 51 dst_locked = 0; | |
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52 if ( SDL_MUSTLOCK(dst) ) { |
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53 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 54 okay = 0; |
| 55 } else { | |
| 56 dst_locked = 1; | |
| 57 } | |
| 58 } | |
| 59 /* Lock the source if it's in hardware */ | |
| 60 src_locked = 0; | |
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61 if ( SDL_MUSTLOCK(src) ) { |
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62 if ( SDL_LockSurface(src) < 0 ) { |
| 0 | 63 okay = 0; |
| 64 } else { | |
| 65 src_locked = 1; | |
| 66 } | |
| 67 } | |
| 68 | |
| 69 /* Set up source and destination buffer pointers, and BLIT! */ | |
| 70 if ( okay && srcrect->w && srcrect->h ) { | |
| 71 SDL_BlitInfo info; | |
| 72 SDL_loblit RunBlit; | |
| 73 | |
| 74 /* Set up the blit information */ | |
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75 info.s_pixels = (Uint8 *)src->pixels + |
| 0 | 76 (Uint16)srcrect->y*src->pitch + |
| 77 (Uint16)srcrect->x*src->format->BytesPerPixel; | |
| 78 info.s_width = srcrect->w; | |
| 79 info.s_height = srcrect->h; | |
| 80 info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel; | |
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81 info.d_pixels = (Uint8 *)dst->pixels + |
| 0 | 82 (Uint16)dstrect->y*dst->pitch + |
| 83 (Uint16)dstrect->x*dst->format->BytesPerPixel; | |
| 84 info.d_width = dstrect->w; | |
| 85 info.d_height = dstrect->h; | |
| 86 info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel; | |
| 87 info.aux_data = src->map->sw_data->aux_data; | |
| 88 info.src = src->format; | |
| 89 info.table = src->map->table; | |
| 90 info.dst = dst->format; | |
| 91 RunBlit = src->map->sw_data->blit; | |
| 92 | |
| 93 /* Run the actual software blit */ | |
| 94 RunBlit(&info); | |
| 95 } | |
| 96 | |
| 97 /* We need to unlock the surfaces if they're locked */ | |
| 98 if ( dst_locked ) { | |
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99 SDL_UnlockSurface(dst); |
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100 } |
| 0 | 101 if ( src_locked ) { |
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102 SDL_UnlockSurface(src); |
| 0 | 103 } |
| 104 /* Blit is done! */ | |
| 105 return(okay ? 0 : -1); | |
| 106 } | |
| 107 | |
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108 #ifdef MMX_ASMBLIT |
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109 static __inline__ void SDL_memcpyMMX(Uint8 *to, const Uint8 *from, int len) |
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110 { |
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111 int i; |
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112 |
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113 for(i=0; i<len/8; i++) { |
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114 __asm__ __volatile__ ( |
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115 " movq (%0), %%mm0\n" |
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116 " movq %%mm0, (%1)\n" |
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117 : : "r" (from), "r" (to) : "memory"); |
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118 from+=8; |
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119 to+=8; |
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120 } |
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121 if (len&7) |
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122 SDL_memcpy(to, from, len&7); |
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123 } |
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124 |
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125 static __inline__ void SDL_memcpySSE(Uint8 *to, const Uint8 *from, int len) |
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126 { |
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127 int i; |
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128 |
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129 __asm__ __volatile__ ( |
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130 " prefetchnta (%0)\n" |
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131 " prefetchnta 64(%0)\n" |
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132 " prefetchnta 128(%0)\n" |
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133 " prefetchnta 192(%0)\n" |
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134 : : "r" (from) ); |
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135 |
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136 for(i=0; i<len/8; i++) { |
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137 __asm__ __volatile__ ( |
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138 " prefetchnta 256(%0)\n" |
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139 " movq (%0), %%mm0\n" |
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140 " movntq %%mm0, (%1)\n" |
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141 : : "r" (from), "r" (to) : "memory"); |
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142 from+=8; |
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143 to+=8; |
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144 } |
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145 if (len&7) |
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146 SDL_memcpy(to, from, len&7); |
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147 } |
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148 #endif |
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149 |
| 0 | 150 static void SDL_BlitCopy(SDL_BlitInfo *info) |
| 151 { | |
| 152 Uint8 *src, *dst; | |
| 153 int w, h; | |
| 154 int srcskip, dstskip; | |
| 155 | |
| 156 w = info->d_width*info->dst->BytesPerPixel; | |
| 157 h = info->d_height; | |
| 158 src = info->s_pixels; | |
| 159 dst = info->d_pixels; | |
| 160 srcskip = w+info->s_skip; | |
| 161 dstskip = w+info->d_skip; | |
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162 #ifdef MMX_ASMBLIT |
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163 if(SDL_HasSSE()) |
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164 { |
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165 while ( h-- ) { |
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166 SDL_memcpySSE(dst, src, w); |
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167 src += srcskip; |
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168 dst += dstskip; |
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169 } |
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170 __asm__ __volatile__ ( |
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171 " emms\n" |
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172 ::); |
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173 } |
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174 else |
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175 if(SDL_HasMMX()) |
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176 { |
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177 while ( h-- ) { |
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178 SDL_memcpyMMX(dst, src, w); |
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179 src += srcskip; |
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180 dst += dstskip; |
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181 } |
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182 __asm__ __volatile__ ( |
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183 " emms\n" |
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184 ::); |
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185 } |
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186 else |
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187 #endif |
| 0 | 188 while ( h-- ) { |
| 189 SDL_memcpy(dst, src, w); | |
| 190 src += srcskip; | |
| 191 dst += dstskip; | |
| 192 } | |
| 193 } | |
| 194 | |
| 195 static void SDL_BlitCopyOverlap(SDL_BlitInfo *info) | |
| 196 { | |
| 197 Uint8 *src, *dst; | |
| 198 int w, h; | |
| 199 int srcskip, dstskip; | |
| 200 | |
| 201 w = info->d_width*info->dst->BytesPerPixel; | |
| 202 h = info->d_height; | |
| 203 src = info->s_pixels; | |
| 204 dst = info->d_pixels; | |
| 205 srcskip = w+info->s_skip; | |
| 206 dstskip = w+info->d_skip; | |
| 207 if ( dst < src ) { | |
| 208 while ( h-- ) { | |
| 209 SDL_memcpy(dst, src, w); | |
| 210 src += srcskip; | |
| 211 dst += dstskip; | |
| 212 } | |
| 213 } else { | |
| 214 src += ((h-1) * srcskip); | |
| 215 dst += ((h-1) * dstskip); | |
| 216 while ( h-- ) { | |
| 217 SDL_revcpy(dst, src, w); | |
| 218 src -= srcskip; | |
| 219 dst -= dstskip; | |
| 220 } | |
| 221 } | |
| 222 } | |
| 223 | |
| 224 /* Figure out which of many blit routines to set up on a surface */ | |
| 225 int SDL_CalculateBlit(SDL_Surface *surface) | |
| 226 { | |
| 227 int blit_index; | |
| 228 | |
| 229 /* Clean everything out to start */ | |
| 230 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 231 SDL_UnRLESurface(surface, 1); | |
| 232 } | |
| 233 surface->map->sw_blit = NULL; | |
| 234 | |
| 235 /* Figure out if an accelerated hardware blit is possible */ | |
| 236 surface->flags &= ~SDL_HWACCEL; | |
| 237 if ( surface->map->identity ) { | |
| 238 int hw_blit_ok; | |
| 239 | |
| 240 if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { | |
| 241 /* We only support accelerated blitting to hardware */ | |
| 242 if ( surface->map->dst->flags & SDL_HWSURFACE ) { | |
| 243 hw_blit_ok = current_video->info.blit_hw; | |
| 244 } else { | |
| 245 hw_blit_ok = 0; | |
| 246 } | |
| 247 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { | |
| 248 hw_blit_ok = current_video->info.blit_hw_CC; | |
| 249 } | |
| 250 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { | |
| 251 hw_blit_ok = current_video->info.blit_hw_A; | |
| 252 } | |
| 253 } else { | |
| 254 /* We only support accelerated blitting to hardware */ | |
| 255 if ( surface->map->dst->flags & SDL_HWSURFACE ) { | |
| 256 hw_blit_ok = current_video->info.blit_sw; | |
| 257 } else { | |
| 258 hw_blit_ok = 0; | |
| 259 } | |
| 260 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { | |
| 261 hw_blit_ok = current_video->info.blit_sw_CC; | |
| 262 } | |
| 263 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { | |
| 264 hw_blit_ok = current_video->info.blit_sw_A; | |
| 265 } | |
| 266 } | |
| 267 if ( hw_blit_ok ) { | |
| 268 SDL_VideoDevice *video = current_video; | |
| 269 SDL_VideoDevice *this = current_video; | |
| 270 video->CheckHWBlit(this, surface, surface->map->dst); | |
| 271 } | |
| 272 } | |
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273 |
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274 /* if an alpha pixel format is specified, we can accelerate alpha blits */ |
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275 if (((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE )&&(current_video->displayformatalphapixel)) |
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276 { |
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277 if ( (surface->flags & SDL_SRCALPHA) ) |
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278 if ( current_video->info.blit_hw_A ) { |
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279 SDL_VideoDevice *video = current_video; |
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280 SDL_VideoDevice *this = current_video; |
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281 video->CheckHWBlit(this, surface, surface->map->dst); |
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282 } |
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283 } |
| 0 | 284 |
| 285 /* Get the blit function index, based on surface mode */ | |
| 286 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */ | |
| 287 blit_index = 0; | |
| 288 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0; | |
| 289 if ( surface->flags & SDL_SRCALPHA | |
| 290 && (surface->format->alpha != SDL_ALPHA_OPAQUE | |
| 291 || surface->format->Amask) ) { | |
| 292 blit_index |= 2; | |
| 293 } | |
| 294 | |
| 295 /* Check for special "identity" case -- copy blit */ | |
| 296 if ( surface->map->identity && blit_index == 0 ) { | |
| 297 surface->map->sw_data->blit = SDL_BlitCopy; | |
| 298 | |
| 299 /* Handle overlapping blits on the same surface */ | |
| 300 if ( surface == surface->map->dst ) { | |
| 301 surface->map->sw_data->blit = SDL_BlitCopyOverlap; | |
| 302 } | |
| 303 } else { | |
| 304 if ( surface->format->BitsPerPixel < 8 ) { | |
| 305 surface->map->sw_data->blit = | |
| 306 SDL_CalculateBlit0(surface, blit_index); | |
| 307 } else { | |
| 308 switch ( surface->format->BytesPerPixel ) { | |
| 309 case 1: | |
| 310 surface->map->sw_data->blit = | |
| 311 SDL_CalculateBlit1(surface, blit_index); | |
| 312 break; | |
| 313 case 2: | |
| 314 case 3: | |
| 315 case 4: | |
| 316 surface->map->sw_data->blit = | |
| 317 SDL_CalculateBlitN(surface, blit_index); | |
| 318 break; | |
| 319 default: | |
| 320 surface->map->sw_data->blit = NULL; | |
| 321 break; | |
| 322 } | |
| 323 } | |
| 324 } | |
| 325 /* Make sure we have a blit function */ | |
| 326 if ( surface->map->sw_data->blit == NULL ) { | |
| 327 SDL_InvalidateMap(surface->map); | |
| 328 SDL_SetError("Blit combination not supported"); | |
| 329 return(-1); | |
| 330 } | |
| 331 | |
| 332 /* Choose software blitting function */ | |
| 333 if(surface->flags & SDL_RLEACCELOK | |
| 334 && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) { | |
| 335 | |
| 336 if(surface->map->identity | |
| 337 && (blit_index == 1 | |
| 338 || (blit_index == 3 && !surface->format->Amask))) { | |
| 339 if ( SDL_RLESurface(surface) == 0 ) | |
| 340 surface->map->sw_blit = SDL_RLEBlit; | |
| 341 } else if(blit_index == 2 && surface->format->Amask) { | |
| 342 if ( SDL_RLESurface(surface) == 0 ) | |
| 343 surface->map->sw_blit = SDL_RLEAlphaBlit; | |
| 344 } | |
| 345 } | |
| 346 | |
| 347 if ( surface->map->sw_blit == NULL ) { | |
| 348 surface->map->sw_blit = SDL_SoftBlit; | |
| 349 } | |
| 350 return(0); | |
| 351 } | |
| 352 |