Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.c @ 1312:c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 01 Feb 2006 06:32:25 +0000 |
| parents | b81f54c3963f |
| children | 450721ad5436 |
| 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 <stdio.h> | |
| 24 #include <stdlib.h> | |
| 25 #include <string.h> | |
| 26 | |
| 27 #include "SDL_error.h" | |
| 28 #include "SDL_video.h" | |
| 29 #include "SDL_sysvideo.h" | |
| 30 #include "SDL_blit.h" | |
| 31 #include "SDL_RLEaccel_c.h" | |
| 32 #include "SDL_pixels_c.h" | |
| 33 #include "SDL_memops.h" | |
| 34 | |
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35 #if (defined(i386) || defined(__x86_64__)) && defined(__GNUC__) && defined(USE_ASMBLIT) |
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36 #define MMX_ASMBLIT |
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37 #endif |
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38 |
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39 #if defined(MMX_ASMBLIT) |
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40 #include "SDL_cpuinfo.h" |
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41 #include "mmx.h" |
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42 #endif |
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43 |
| 0 | 44 /* The general purpose software blit routine */ |
| 45 static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 46 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 47 { | |
| 48 int okay; | |
| 49 int src_locked; | |
| 50 int dst_locked; | |
| 51 | |
| 52 /* Everything is okay at the beginning... */ | |
| 53 okay = 1; | |
| 54 | |
| 55 /* Lock the destination if it's in hardware */ | |
| 56 dst_locked = 0; | |
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57 if ( SDL_MUSTLOCK(dst) ) { |
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58 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 59 okay = 0; |
| 60 } else { | |
| 61 dst_locked = 1; | |
| 62 } | |
| 63 } | |
| 64 /* Lock the source if it's in hardware */ | |
| 65 src_locked = 0; | |
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66 if ( SDL_MUSTLOCK(src) ) { |
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67 if ( SDL_LockSurface(src) < 0 ) { |
| 0 | 68 okay = 0; |
| 69 } else { | |
| 70 src_locked = 1; | |
| 71 } | |
| 72 } | |
| 73 | |
| 74 /* Set up source and destination buffer pointers, and BLIT! */ | |
| 75 if ( okay && srcrect->w && srcrect->h ) { | |
| 76 SDL_BlitInfo info; | |
| 77 SDL_loblit RunBlit; | |
| 78 | |
| 79 /* Set up the blit information */ | |
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80 info.s_pixels = (Uint8 *)src->pixels + |
| 0 | 81 (Uint16)srcrect->y*src->pitch + |
| 82 (Uint16)srcrect->x*src->format->BytesPerPixel; | |
| 83 info.s_width = srcrect->w; | |
| 84 info.s_height = srcrect->h; | |
| 85 info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel; | |
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86 info.d_pixels = (Uint8 *)dst->pixels + |
| 0 | 87 (Uint16)dstrect->y*dst->pitch + |
| 88 (Uint16)dstrect->x*dst->format->BytesPerPixel; | |
| 89 info.d_width = dstrect->w; | |
| 90 info.d_height = dstrect->h; | |
| 91 info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel; | |
| 92 info.aux_data = src->map->sw_data->aux_data; | |
| 93 info.src = src->format; | |
| 94 info.table = src->map->table; | |
| 95 info.dst = dst->format; | |
| 96 RunBlit = src->map->sw_data->blit; | |
| 97 | |
| 98 /* Run the actual software blit */ | |
| 99 RunBlit(&info); | |
| 100 } | |
| 101 | |
| 102 /* We need to unlock the surfaces if they're locked */ | |
| 103 if ( dst_locked ) { | |
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104 SDL_UnlockSurface(dst); |
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105 } |
| 0 | 106 if ( src_locked ) { |
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107 SDL_UnlockSurface(src); |
| 0 | 108 } |
| 109 /* Blit is done! */ | |
| 110 return(okay ? 0 : -1); | |
| 111 } | |
| 112 | |
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113 #ifdef MMX_ASMBLIT |
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114 static __inline__ void SDL_memcpyMMX(Uint8 *to, const Uint8 *from, int len) |
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115 { |
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116 int i; |
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117 |
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118 for(i=0; i<len/8; i++) { |
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119 __asm__ __volatile__ ( |
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120 " movq (%0), %%mm0\n" |
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121 " movq %%mm0, (%1)\n" |
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122 : : "r" (from), "r" (to) : "memory"); |
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123 from+=8; |
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124 to+=8; |
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125 } |
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126 if (len&7) |
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127 SDL_memcpy(to, from, len&7); |
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128 } |
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129 |
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130 static __inline__ void SDL_memcpySSE(Uint8 *to, const Uint8 *from, int len) |
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131 { |
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132 int i; |
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133 |
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134 __asm__ __volatile__ ( |
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135 " prefetchnta (%0)\n" |
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136 " prefetchnta 64(%0)\n" |
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137 " prefetchnta 128(%0)\n" |
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138 " prefetchnta 192(%0)\n" |
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139 : : "r" (from) ); |
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140 |
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141 for(i=0; i<len/8; i++) { |
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142 __asm__ __volatile__ ( |
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143 " prefetchnta 256(%0)\n" |
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144 " movq (%0), %%mm0\n" |
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145 " movntq %%mm0, (%1)\n" |
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146 : : "r" (from), "r" (to) : "memory"); |
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147 from+=8; |
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148 to+=8; |
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149 } |
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150 if (len&7) |
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151 SDL_memcpy(to, from, len&7); |
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152 } |
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153 #endif |
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154 |
| 0 | 155 static void SDL_BlitCopy(SDL_BlitInfo *info) |
| 156 { | |
| 157 Uint8 *src, *dst; | |
| 158 int w, h; | |
| 159 int srcskip, dstskip; | |
| 160 | |
| 161 w = info->d_width*info->dst->BytesPerPixel; | |
| 162 h = info->d_height; | |
| 163 src = info->s_pixels; | |
| 164 dst = info->d_pixels; | |
| 165 srcskip = w+info->s_skip; | |
| 166 dstskip = w+info->d_skip; | |
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167 #ifdef MMX_ASMBLIT |
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168 if(SDL_HasSSE()) |
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169 { |
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170 while ( h-- ) { |
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171 SDL_memcpySSE(dst, src, w); |
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172 src += srcskip; |
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173 dst += dstskip; |
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174 } |
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175 __asm__ __volatile__ ( |
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176 " emms\n" |
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177 ::); |
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178 } |
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179 else |
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180 if(SDL_HasMMX()) |
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181 { |
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182 while ( h-- ) { |
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183 SDL_memcpyMMX(dst, src, w); |
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184 src += srcskip; |
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185 dst += dstskip; |
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186 } |
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187 __asm__ __volatile__ ( |
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188 " emms\n" |
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189 ::); |
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190 } |
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191 else |
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192 #endif |
| 0 | 193 while ( h-- ) { |
| 194 SDL_memcpy(dst, src, w); | |
| 195 src += srcskip; | |
| 196 dst += dstskip; | |
| 197 } | |
| 198 } | |
| 199 | |
| 200 static void SDL_BlitCopyOverlap(SDL_BlitInfo *info) | |
| 201 { | |
| 202 Uint8 *src, *dst; | |
| 203 int w, h; | |
| 204 int srcskip, dstskip; | |
| 205 | |
| 206 w = info->d_width*info->dst->BytesPerPixel; | |
| 207 h = info->d_height; | |
| 208 src = info->s_pixels; | |
| 209 dst = info->d_pixels; | |
| 210 srcskip = w+info->s_skip; | |
| 211 dstskip = w+info->d_skip; | |
| 212 if ( dst < src ) { | |
| 213 while ( h-- ) { | |
| 214 SDL_memcpy(dst, src, w); | |
| 215 src += srcskip; | |
| 216 dst += dstskip; | |
| 217 } | |
| 218 } else { | |
| 219 src += ((h-1) * srcskip); | |
| 220 dst += ((h-1) * dstskip); | |
| 221 while ( h-- ) { | |
| 222 SDL_revcpy(dst, src, w); | |
| 223 src -= srcskip; | |
| 224 dst -= dstskip; | |
| 225 } | |
| 226 } | |
| 227 } | |
| 228 | |
| 229 /* Figure out which of many blit routines to set up on a surface */ | |
| 230 int SDL_CalculateBlit(SDL_Surface *surface) | |
| 231 { | |
| 232 int blit_index; | |
| 233 | |
| 234 /* Clean everything out to start */ | |
| 235 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 236 SDL_UnRLESurface(surface, 1); | |
| 237 } | |
| 238 surface->map->sw_blit = NULL; | |
| 239 | |
| 240 /* Figure out if an accelerated hardware blit is possible */ | |
| 241 surface->flags &= ~SDL_HWACCEL; | |
| 242 if ( surface->map->identity ) { | |
| 243 int hw_blit_ok; | |
| 244 | |
| 245 if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { | |
| 246 /* We only support accelerated blitting to hardware */ | |
| 247 if ( surface->map->dst->flags & SDL_HWSURFACE ) { | |
| 248 hw_blit_ok = current_video->info.blit_hw; | |
| 249 } else { | |
| 250 hw_blit_ok = 0; | |
| 251 } | |
| 252 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { | |
| 253 hw_blit_ok = current_video->info.blit_hw_CC; | |
| 254 } | |
| 255 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { | |
| 256 hw_blit_ok = current_video->info.blit_hw_A; | |
| 257 } | |
| 258 } else { | |
| 259 /* We only support accelerated blitting to hardware */ | |
| 260 if ( surface->map->dst->flags & SDL_HWSURFACE ) { | |
| 261 hw_blit_ok = current_video->info.blit_sw; | |
| 262 } else { | |
| 263 hw_blit_ok = 0; | |
| 264 } | |
| 265 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { | |
| 266 hw_blit_ok = current_video->info.blit_sw_CC; | |
| 267 } | |
| 268 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { | |
| 269 hw_blit_ok = current_video->info.blit_sw_A; | |
| 270 } | |
| 271 } | |
| 272 if ( hw_blit_ok ) { | |
| 273 SDL_VideoDevice *video = current_video; | |
| 274 SDL_VideoDevice *this = current_video; | |
| 275 video->CheckHWBlit(this, surface, surface->map->dst); | |
| 276 } | |
| 277 } | |
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278 |
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279 /* if an alpha pixel format is specified, we can accelerate alpha blits */ |
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280 if (((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE )&&(current_video->displayformatalphapixel)) |
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281 { |
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282 if ( (surface->flags & SDL_SRCALPHA) ) |
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283 if ( current_video->info.blit_hw_A ) { |
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284 SDL_VideoDevice *video = current_video; |
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285 SDL_VideoDevice *this = current_video; |
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286 video->CheckHWBlit(this, surface, surface->map->dst); |
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287 } |
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288 } |
| 0 | 289 |
| 290 /* Get the blit function index, based on surface mode */ | |
| 291 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */ | |
| 292 blit_index = 0; | |
| 293 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0; | |
| 294 if ( surface->flags & SDL_SRCALPHA | |
| 295 && (surface->format->alpha != SDL_ALPHA_OPAQUE | |
| 296 || surface->format->Amask) ) { | |
| 297 blit_index |= 2; | |
| 298 } | |
| 299 | |
| 300 /* Check for special "identity" case -- copy blit */ | |
| 301 if ( surface->map->identity && blit_index == 0 ) { | |
| 302 surface->map->sw_data->blit = SDL_BlitCopy; | |
| 303 | |
| 304 /* Handle overlapping blits on the same surface */ | |
| 305 if ( surface == surface->map->dst ) { | |
| 306 surface->map->sw_data->blit = SDL_BlitCopyOverlap; | |
| 307 } | |
| 308 } else { | |
| 309 if ( surface->format->BitsPerPixel < 8 ) { | |
| 310 surface->map->sw_data->blit = | |
| 311 SDL_CalculateBlit0(surface, blit_index); | |
| 312 } else { | |
| 313 switch ( surface->format->BytesPerPixel ) { | |
| 314 case 1: | |
| 315 surface->map->sw_data->blit = | |
| 316 SDL_CalculateBlit1(surface, blit_index); | |
| 317 break; | |
| 318 case 2: | |
| 319 case 3: | |
| 320 case 4: | |
| 321 surface->map->sw_data->blit = | |
| 322 SDL_CalculateBlitN(surface, blit_index); | |
| 323 break; | |
| 324 default: | |
| 325 surface->map->sw_data->blit = NULL; | |
| 326 break; | |
| 327 } | |
| 328 } | |
| 329 } | |
| 330 /* Make sure we have a blit function */ | |
| 331 if ( surface->map->sw_data->blit == NULL ) { | |
| 332 SDL_InvalidateMap(surface->map); | |
| 333 SDL_SetError("Blit combination not supported"); | |
| 334 return(-1); | |
| 335 } | |
| 336 | |
| 337 /* Choose software blitting function */ | |
| 338 if(surface->flags & SDL_RLEACCELOK | |
| 339 && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) { | |
| 340 | |
| 341 if(surface->map->identity | |
| 342 && (blit_index == 1 | |
| 343 || (blit_index == 3 && !surface->format->Amask))) { | |
| 344 if ( SDL_RLESurface(surface) == 0 ) | |
| 345 surface->map->sw_blit = SDL_RLEBlit; | |
| 346 } else if(blit_index == 2 && surface->format->Amask) { | |
| 347 if ( SDL_RLESurface(surface) == 0 ) | |
| 348 surface->map->sw_blit = SDL_RLEAlphaBlit; | |
| 349 } | |
| 350 } | |
| 351 | |
| 352 if ( surface->map->sw_blit == NULL ) { | |
| 353 surface->map->sw_blit = SDL_SoftBlit; | |
| 354 } | |
| 355 return(0); | |
| 356 } | |
| 357 |