Mercurial > sdl-ios-xcode
annotate src/video/SDL_stretch.c @ 946:8520712f8ef0
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 21 Aug 2004 14:54:49 +0000 |
| parents | 1d1a823904d8 |
| children | 10b3fb28c86b |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* This a stretch blit implementation based on ideas given to me by | |
| 29 Tomasz Cejner - thanks! :) | |
| 30 | |
| 31 April 27, 2000 - Sam Lantinga | |
| 32 */ | |
| 33 | |
| 34 #include "SDL_error.h" | |
| 35 #include "SDL_video.h" | |
| 36 #include "SDL_blit.h" | |
| 37 | |
| 38 /* This isn't ready for general consumption yet - it should be folded | |
| 39 into the general blitting mechanism. | |
| 40 */ | |
| 41 | |
|
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42 #if (defined(WIN32) && !defined(_M_ALPHA) && !defined(_WIN32_WCE) && \ |
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43 !defined(__WATCOMC__) && !defined(__LCC__) && !defined(__FREEBCC__)) || \ |
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44 (defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)) |
| 0 | 45 #define USE_ASM_STRETCH |
| 46 #endif | |
| 47 | |
| 48 #ifdef USE_ASM_STRETCH | |
| 49 | |
| 50 #if defined(WIN32) || defined(i386) | |
| 51 #define PREFIX16 0x66 | |
| 52 #define STORE_BYTE 0xAA | |
| 53 #define STORE_WORD 0xAB | |
| 54 #define LOAD_BYTE 0xAC | |
| 55 #define LOAD_WORD 0xAD | |
| 56 #define RETURN 0xC3 | |
| 57 #else | |
| 58 #error Need assembly opcodes for this architecture | |
| 59 #endif | |
| 60 | |
| 61 #if defined(__ELF__) && defined(__GNUC__) | |
| 62 extern unsigned char _copy_row[4096] __attribute__ ((alias ("copy_row"))); | |
| 63 #endif | |
| 64 static unsigned char copy_row[4096]; | |
| 65 | |
| 66 static int generate_rowbytes(int src_w, int dst_w, int bpp) | |
| 67 { | |
| 68 static struct { | |
| 69 int bpp; | |
| 70 int src_w; | |
| 71 int dst_w; | |
| 72 } last; | |
| 73 | |
| 74 int i; | |
| 75 int pos, inc; | |
| 76 unsigned char *eip; | |
| 77 unsigned char load, store; | |
| 78 | |
| 79 /* See if we need to regenerate the copy buffer */ | |
| 80 if ( (src_w == last.src_w) && | |
| 81 (dst_w == last.src_w) && (bpp == last.bpp) ) { | |
| 82 return(0); | |
| 83 } | |
| 84 last.bpp = bpp; | |
| 85 last.src_w = src_w; | |
| 86 last.dst_w = dst_w; | |
| 87 | |
| 88 switch (bpp) { | |
| 89 case 1: | |
| 90 load = LOAD_BYTE; | |
| 91 store = STORE_BYTE; | |
| 92 break; | |
| 93 case 2: | |
| 94 case 4: | |
| 95 load = LOAD_WORD; | |
| 96 store = STORE_WORD; | |
| 97 break; | |
| 98 default: | |
| 99 SDL_SetError("ASM stretch of %d bytes isn't supported\n", bpp); | |
| 100 return(-1); | |
| 101 } | |
| 102 pos = 0x10000; | |
| 103 inc = (src_w << 16) / dst_w; | |
| 104 eip = copy_row; | |
| 105 for ( i=0; i<dst_w; ++i ) { | |
| 106 while ( pos >= 0x10000L ) { | |
| 107 if ( bpp == 2 ) { | |
| 108 *eip++ = PREFIX16; | |
| 109 } | |
| 110 *eip++ = load; | |
| 111 pos -= 0x10000L; | |
| 112 } | |
| 113 if ( bpp == 2 ) { | |
| 114 *eip++ = PREFIX16; | |
| 115 } | |
| 116 *eip++ = store; | |
| 117 pos += inc; | |
| 118 } | |
| 119 *eip++ = RETURN; | |
| 120 | |
| 121 /* Verify that we didn't overflow (too late) */ | |
| 122 if ( eip > (copy_row+sizeof(copy_row)) ) { | |
| 123 SDL_SetError("Copy buffer overflow"); | |
| 124 return(-1); | |
| 125 } | |
| 126 return(0); | |
| 127 } | |
| 128 | |
| 129 #else | |
| 130 | |
| 131 #define DEFINE_COPY_ROW(name, type) \ | |
| 132 void name(type *src, int src_w, type *dst, int dst_w) \ | |
| 133 { \ | |
| 134 int i; \ | |
| 135 int pos, inc; \ | |
| 136 type pixel = 0; \ | |
| 137 \ | |
| 138 pos = 0x10000; \ | |
| 139 inc = (src_w << 16) / dst_w; \ | |
| 140 for ( i=dst_w; i>0; --i ) { \ | |
| 141 while ( pos >= 0x10000L ) { \ | |
| 142 pixel = *src++; \ | |
| 143 pos -= 0x10000L; \ | |
| 144 } \ | |
| 145 *dst++ = pixel; \ | |
| 146 pos += inc; \ | |
| 147 } \ | |
| 148 } | |
| 149 DEFINE_COPY_ROW(copy_row1, Uint8) | |
| 150 DEFINE_COPY_ROW(copy_row2, Uint16) | |
| 151 DEFINE_COPY_ROW(copy_row4, Uint32) | |
| 152 | |
| 153 #endif /* USE_ASM_STRETCH */ | |
| 154 | |
| 155 /* The ASM code doesn't handle 24-bpp stretch blits */ | |
| 156 void copy_row3(Uint8 *src, int src_w, Uint8 *dst, int dst_w) | |
| 157 { | |
| 158 int i; | |
| 159 int pos, inc; | |
| 160 Uint8 pixel[3]; | |
| 161 | |
| 162 pos = 0x10000; | |
| 163 inc = (src_w << 16) / dst_w; | |
| 164 for ( i=dst_w; i>0; --i ) { | |
| 165 while ( pos >= 0x10000L ) { | |
| 166 pixel[0] = *src++; | |
| 167 pixel[1] = *src++; | |
| 168 pixel[2] = *src++; | |
| 169 pos -= 0x10000L; | |
| 170 } | |
| 171 *dst++ = pixel[0]; | |
| 172 *dst++ = pixel[1]; | |
| 173 *dst++ = pixel[2]; | |
| 174 pos += inc; | |
| 175 } | |
| 176 } | |
| 177 | |
| 178 /* Perform a stretch blit between two surfaces of the same format. | |
| 179 NOTE: This function is not safe to call from multiple threads! | |
| 180 */ | |
| 181 int SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect, | |
| 182 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 183 { | |
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184 int src_locked; |
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185 int dst_locked; |
| 0 | 186 int pos, inc; |
| 187 int dst_width; | |
| 188 int dst_maxrow; | |
| 189 int src_row, dst_row; | |
| 190 Uint8 *srcp = NULL; | |
| 191 Uint8 *dstp; | |
| 192 SDL_Rect full_src; | |
| 193 SDL_Rect full_dst; | |
| 194 #if defined(USE_ASM_STRETCH) && defined(__GNUC__) | |
| 195 int u1, u2; | |
| 196 #endif | |
| 197 const int bpp = dst->format->BytesPerPixel; | |
| 198 | |
| 199 if ( src->format->BitsPerPixel != dst->format->BitsPerPixel ) { | |
| 200 SDL_SetError("Only works with same format surfaces"); | |
| 201 return(-1); | |
| 202 } | |
| 203 | |
| 204 /* Verify the blit rectangles */ | |
| 205 if ( srcrect ) { | |
| 206 if ( (srcrect->x < 0) || (srcrect->y < 0) || | |
| 207 ((srcrect->x+srcrect->w) > src->w) || | |
| 208 ((srcrect->y+srcrect->h) > src->h) ) { | |
| 209 SDL_SetError("Invalid source blit rectangle"); | |
| 210 return(-1); | |
| 211 } | |
| 212 } else { | |
| 213 full_src.x = 0; | |
| 214 full_src.y = 0; | |
| 215 full_src.w = src->w; | |
| 216 full_src.h = src->h; | |
| 217 srcrect = &full_src; | |
| 218 } | |
| 219 if ( dstrect ) { | |
| 220 if ( (dstrect->x < 0) || (dstrect->y < 0) || | |
| 221 ((dstrect->x+dstrect->w) > dst->w) || | |
| 222 ((dstrect->y+dstrect->h) > dst->h) ) { | |
| 223 SDL_SetError("Invalid destination blit rectangle"); | |
| 224 return(-1); | |
| 225 } | |
| 226 } else { | |
| 227 full_dst.x = 0; | |
| 228 full_dst.y = 0; | |
| 229 full_dst.w = dst->w; | |
| 230 full_dst.h = dst->h; | |
| 231 dstrect = &full_dst; | |
| 232 } | |
| 233 | |
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234 /* Lock the destination if it's in hardware */ |
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235 dst_locked = 0; |
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236 if ( SDL_MUSTLOCK(dst) ) { |
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237 if ( SDL_LockSurface(dst) < 0 ) { |
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238 SDL_SetError("Unable to lock destination surface"); |
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239 return(-1); |
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240 } |
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241 dst_locked = 1; |
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242 } |
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243 /* Lock the source if it's in hardware */ |
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244 src_locked = 0; |
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245 if ( SDL_MUSTLOCK(src) ) { |
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246 if ( SDL_LockSurface(src) < 0 ) { |
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247 if ( dst_locked ) { |
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248 SDL_UnlockSurface(dst); |
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249 } |
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250 SDL_SetError("Unable to lock source surface"); |
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251 return(-1); |
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252 } |
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253 src_locked = 1; |
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254 } |
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255 |
| 0 | 256 /* Set up the data... */ |
| 257 pos = 0x10000; | |
| 258 inc = (srcrect->h << 16) / dstrect->h; | |
| 259 src_row = srcrect->y; | |
| 260 dst_row = dstrect->y; | |
| 261 dst_width = dstrect->w*bpp; | |
| 262 | |
| 263 #ifdef USE_ASM_STRETCH | |
| 264 /* Write the opcodes for this stretch */ | |
| 265 if ( (bpp != 3) && | |
| 266 (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0) ) { | |
| 267 return(-1); | |
| 268 } | |
| 269 #endif | |
| 270 | |
| 271 /* Perform the stretch blit */ | |
| 272 for ( dst_maxrow = dst_row+dstrect->h; dst_row<dst_maxrow; ++dst_row ) { | |
| 273 dstp = (Uint8 *)dst->pixels + (dst_row*dst->pitch) | |
| 274 + (dstrect->x*bpp); | |
| 275 while ( pos >= 0x10000L ) { | |
| 276 srcp = (Uint8 *)src->pixels + (src_row*src->pitch) | |
| 277 + (srcrect->x*bpp); | |
| 278 ++src_row; | |
| 279 pos -= 0x10000L; | |
| 280 } | |
| 281 #ifdef USE_ASM_STRETCH | |
| 282 switch (bpp) { | |
| 283 case 3: | |
| 284 copy_row3(srcp, srcrect->w, dstp, dstrect->w); | |
| 285 break; | |
| 286 default: | |
| 287 #ifdef __GNUC__ | |
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288 __asm__ __volatile__ ( |
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289 "call _copy_row" |
| 0 | 290 : "=&D" (u1), "=&S" (u2) |
| 291 : "0" (dstp), "1" (srcp) | |
| 292 : "memory" ); | |
| 293 #else | |
| 294 #ifdef WIN32 | |
| 295 { void *code = ©_row; | |
| 296 __asm { | |
| 297 push edi | |
| 298 push esi | |
| 299 | |
| 300 mov edi, dstp | |
| 301 mov esi, srcp | |
| 302 call dword ptr code | |
| 303 | |
| 304 pop esi | |
| 305 pop edi | |
| 306 } | |
| 307 } | |
| 308 #else | |
| 309 #error Need inline assembly for this compiler | |
| 310 #endif | |
| 311 #endif /* __GNUC__ */ | |
| 312 break; | |
| 313 } | |
| 314 #else | |
| 315 switch (bpp) { | |
| 316 case 1: | |
| 317 copy_row1(srcp, srcrect->w, dstp, dstrect->w); | |
| 318 break; | |
| 319 case 2: | |
| 320 copy_row2((Uint16 *)srcp, srcrect->w, | |
| 321 (Uint16 *)dstp, dstrect->w); | |
| 322 break; | |
| 323 case 3: | |
| 324 copy_row3(srcp, srcrect->w, dstp, dstrect->w); | |
| 325 break; | |
| 326 case 4: | |
| 327 copy_row4((Uint32 *)srcp, srcrect->w, | |
| 328 (Uint32 *)dstp, dstrect->w); | |
| 329 break; | |
| 330 } | |
| 331 #endif | |
| 332 pos += inc; | |
| 333 } | |
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334 |
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335 /* We need to unlock the surfaces if they're locked */ |
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336 if ( dst_locked ) { |
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337 SDL_UnlockSurface(dst); |
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338 } |
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339 if ( src_locked ) { |
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340 SDL_UnlockSurface(src); |
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341 } |
| 0 | 342 return(0); |
| 343 } | |
| 344 |