Mercurial > sdl-ios-xcode
annotate src/video/SDL_stretch.c @ 4108:3feb94233f90 SDL-1.2
Fixed bug #528
OpenBSD (and possibly others) do not have executable memory by default,
so use mprotect() to allow execution of dynamic assembly block.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 29 Dec 2007 03:50:29 +0000 |
| parents | b5a4ac87b98c |
| children | cd2ab40f1219 |
| 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 /* This a stretch blit implementation based on ideas given to me by | |
| 25 Tomasz Cejner - thanks! :) | |
| 26 | |
| 27 April 27, 2000 - Sam Lantinga | |
| 28 */ | |
| 29 | |
| 30 #include "SDL_video.h" | |
| 31 #include "SDL_blit.h" | |
| 32 | |
| 33 /* This isn't ready for general consumption yet - it should be folded | |
| 34 into the general blitting mechanism. | |
| 35 */ | |
| 36 | |
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37 #if ((defined(_MFC_VER) && defined(_M_IX86)/* && !defined(_WIN32_WCE) still needed? */) || \ |
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38 defined(__WATCOMC__) || \ |
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39 (defined(__GNUC__) && defined(__i386__))) && SDL_ASSEMBLY_ROUTINES |
| 0 | 40 #define USE_ASM_STRETCH |
| 41 #endif | |
| 42 | |
| 43 #ifdef USE_ASM_STRETCH | |
| 44 | |
| 4108 | 45 /* OpenBSD has non-executable memory by default, so use mprotect() */ |
| 46 #ifdef __OpenBSD__ | |
| 47 #define USE_MPROTECT | |
| 48 #endif | |
| 49 #ifdef USE_MPROTECT | |
| 50 #include <sys/types.h> | |
| 51 #include <sys/mman.h> | |
| 52 #endif | |
| 53 | |
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54 #if defined(_M_IX86) || defined(i386) |
| 0 | 55 #define PREFIX16 0x66 |
| 56 #define STORE_BYTE 0xAA | |
| 57 #define STORE_WORD 0xAB | |
| 58 #define LOAD_BYTE 0xAC | |
| 59 #define LOAD_WORD 0xAD | |
| 60 #define RETURN 0xC3 | |
| 61 #else | |
| 62 #error Need assembly opcodes for this architecture | |
| 63 #endif | |
| 64 | |
| 65 static unsigned char copy_row[4096]; | |
| 66 | |
| 67 static int generate_rowbytes(int src_w, int dst_w, int bpp) | |
| 68 { | |
| 69 static struct { | |
| 70 int bpp; | |
| 71 int src_w; | |
| 72 int dst_w; | |
| 73 } last; | |
| 74 | |
| 75 int i; | |
| 76 int pos, inc; | |
| 77 unsigned char *eip; | |
| 78 unsigned char load, store; | |
| 79 | |
| 80 /* See if we need to regenerate the copy buffer */ | |
| 81 if ( (src_w == last.src_w) && | |
|
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82 (dst_w == last.dst_w) && (bpp == last.bpp) ) { |
| 0 | 83 return(0); |
| 84 } | |
| 85 last.bpp = bpp; | |
| 86 last.src_w = src_w; | |
| 87 last.dst_w = dst_w; | |
| 88 | |
| 89 switch (bpp) { | |
| 90 case 1: | |
| 91 load = LOAD_BYTE; | |
| 92 store = STORE_BYTE; | |
| 93 break; | |
| 94 case 2: | |
| 95 case 4: | |
| 96 load = LOAD_WORD; | |
| 97 store = STORE_WORD; | |
| 98 break; | |
| 99 default: | |
| 100 SDL_SetError("ASM stretch of %d bytes isn't supported\n", bpp); | |
| 101 return(-1); | |
| 102 } | |
| 4108 | 103 #ifdef USE_MPROTECT |
| 104 mprotect(copy_row, sizeof(copy_row), PROT_READ|PROT_WRITE|PROT_EXEC); | |
| 105 #endif | |
| 0 | 106 pos = 0x10000; |
| 107 inc = (src_w << 16) / dst_w; | |
| 108 eip = copy_row; | |
| 109 for ( i=0; i<dst_w; ++i ) { | |
| 110 while ( pos >= 0x10000L ) { | |
| 111 if ( bpp == 2 ) { | |
| 112 *eip++ = PREFIX16; | |
| 113 } | |
| 114 *eip++ = load; | |
| 115 pos -= 0x10000L; | |
| 116 } | |
| 117 if ( bpp == 2 ) { | |
| 118 *eip++ = PREFIX16; | |
| 119 } | |
| 120 *eip++ = store; | |
| 121 pos += inc; | |
| 122 } | |
| 123 *eip++ = RETURN; | |
| 124 | |
| 125 /* Verify that we didn't overflow (too late) */ | |
| 126 if ( eip > (copy_row+sizeof(copy_row)) ) { | |
| 127 SDL_SetError("Copy buffer overflow"); | |
| 128 return(-1); | |
| 129 } | |
| 130 return(0); | |
| 131 } | |
| 132 | |
| 133 #else | |
| 134 | |
| 135 #define DEFINE_COPY_ROW(name, type) \ | |
| 136 void name(type *src, int src_w, type *dst, int dst_w) \ | |
| 137 { \ | |
| 138 int i; \ | |
| 139 int pos, inc; \ | |
| 140 type pixel = 0; \ | |
| 141 \ | |
| 142 pos = 0x10000; \ | |
| 143 inc = (src_w << 16) / dst_w; \ | |
| 144 for ( i=dst_w; i>0; --i ) { \ | |
| 145 while ( pos >= 0x10000L ) { \ | |
| 146 pixel = *src++; \ | |
| 147 pos -= 0x10000L; \ | |
| 148 } \ | |
| 149 *dst++ = pixel; \ | |
| 150 pos += inc; \ | |
| 151 } \ | |
| 152 } | |
| 153 DEFINE_COPY_ROW(copy_row1, Uint8) | |
| 154 DEFINE_COPY_ROW(copy_row2, Uint16) | |
| 155 DEFINE_COPY_ROW(copy_row4, Uint32) | |
| 156 | |
| 157 #endif /* USE_ASM_STRETCH */ | |
| 158 | |
| 159 /* The ASM code doesn't handle 24-bpp stretch blits */ | |
| 160 void copy_row3(Uint8 *src, int src_w, Uint8 *dst, int dst_w) | |
| 161 { | |
| 162 int i; | |
| 163 int pos, inc; | |
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164 Uint8 pixel[3] = { 0, 0, 0 }; |
| 0 | 165 |
| 166 pos = 0x10000; | |
| 167 inc = (src_w << 16) / dst_w; | |
| 168 for ( i=dst_w; i>0; --i ) { | |
| 169 while ( pos >= 0x10000L ) { | |
| 170 pixel[0] = *src++; | |
| 171 pixel[1] = *src++; | |
| 172 pixel[2] = *src++; | |
| 173 pos -= 0x10000L; | |
| 174 } | |
| 175 *dst++ = pixel[0]; | |
| 176 *dst++ = pixel[1]; | |
| 177 *dst++ = pixel[2]; | |
| 178 pos += inc; | |
| 179 } | |
| 180 } | |
| 181 | |
| 182 /* Perform a stretch blit between two surfaces of the same format. | |
| 183 NOTE: This function is not safe to call from multiple threads! | |
| 184 */ | |
| 185 int SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect, | |
| 186 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 187 { | |
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188 int src_locked; |
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189 int dst_locked; |
| 0 | 190 int pos, inc; |
| 191 int dst_width; | |
| 192 int dst_maxrow; | |
| 193 int src_row, dst_row; | |
| 194 Uint8 *srcp = NULL; | |
| 195 Uint8 *dstp; | |
| 196 SDL_Rect full_src; | |
| 197 SDL_Rect full_dst; | |
| 198 #if defined(USE_ASM_STRETCH) && defined(__GNUC__) | |
| 199 int u1, u2; | |
| 200 #endif | |
| 201 const int bpp = dst->format->BytesPerPixel; | |
| 202 | |
| 203 if ( src->format->BitsPerPixel != dst->format->BitsPerPixel ) { | |
| 204 SDL_SetError("Only works with same format surfaces"); | |
| 205 return(-1); | |
| 206 } | |
| 207 | |
| 208 /* Verify the blit rectangles */ | |
| 209 if ( srcrect ) { | |
| 210 if ( (srcrect->x < 0) || (srcrect->y < 0) || | |
| 211 ((srcrect->x+srcrect->w) > src->w) || | |
| 212 ((srcrect->y+srcrect->h) > src->h) ) { | |
| 213 SDL_SetError("Invalid source blit rectangle"); | |
| 214 return(-1); | |
| 215 } | |
| 216 } else { | |
| 217 full_src.x = 0; | |
| 218 full_src.y = 0; | |
| 219 full_src.w = src->w; | |
| 220 full_src.h = src->h; | |
| 221 srcrect = &full_src; | |
| 222 } | |
| 223 if ( dstrect ) { | |
| 224 if ( (dstrect->x < 0) || (dstrect->y < 0) || | |
| 225 ((dstrect->x+dstrect->w) > dst->w) || | |
| 226 ((dstrect->y+dstrect->h) > dst->h) ) { | |
| 227 SDL_SetError("Invalid destination blit rectangle"); | |
| 228 return(-1); | |
| 229 } | |
| 230 } else { | |
| 231 full_dst.x = 0; | |
| 232 full_dst.y = 0; | |
| 233 full_dst.w = dst->w; | |
| 234 full_dst.h = dst->h; | |
| 235 dstrect = &full_dst; | |
| 236 } | |
| 237 | |
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238 /* Lock the destination if it's in hardware */ |
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239 dst_locked = 0; |
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240 if ( SDL_MUSTLOCK(dst) ) { |
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241 if ( SDL_LockSurface(dst) < 0 ) { |
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242 SDL_SetError("Unable to lock destination surface"); |
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243 return(-1); |
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244 } |
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245 dst_locked = 1; |
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246 } |
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247 /* Lock the source if it's in hardware */ |
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248 src_locked = 0; |
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249 if ( SDL_MUSTLOCK(src) ) { |
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250 if ( SDL_LockSurface(src) < 0 ) { |
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251 if ( dst_locked ) { |
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252 SDL_UnlockSurface(dst); |
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253 } |
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254 SDL_SetError("Unable to lock source surface"); |
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255 return(-1); |
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256 } |
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257 src_locked = 1; |
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258 } |
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259 |
| 0 | 260 /* Set up the data... */ |
| 261 pos = 0x10000; | |
| 262 inc = (srcrect->h << 16) / dstrect->h; | |
| 263 src_row = srcrect->y; | |
| 264 dst_row = dstrect->y; | |
| 265 dst_width = dstrect->w*bpp; | |
| 266 | |
| 267 #ifdef USE_ASM_STRETCH | |
| 268 /* Write the opcodes for this stretch */ | |
| 269 if ( (bpp != 3) && | |
| 270 (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0) ) { | |
| 271 return(-1); | |
| 272 } | |
| 273 #endif | |
| 274 | |
| 275 /* Perform the stretch blit */ | |
| 276 for ( dst_maxrow = dst_row+dstrect->h; dst_row<dst_maxrow; ++dst_row ) { | |
| 277 dstp = (Uint8 *)dst->pixels + (dst_row*dst->pitch) | |
| 278 + (dstrect->x*bpp); | |
| 279 while ( pos >= 0x10000L ) { | |
| 280 srcp = (Uint8 *)src->pixels + (src_row*src->pitch) | |
| 281 + (srcrect->x*bpp); | |
| 282 ++src_row; | |
| 283 pos -= 0x10000L; | |
| 284 } | |
| 285 #ifdef USE_ASM_STRETCH | |
| 286 switch (bpp) { | |
| 287 case 3: | |
| 288 copy_row3(srcp, srcrect->w, dstp, dstrect->w); | |
| 289 break; | |
| 290 default: | |
| 291 #ifdef __GNUC__ | |
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292 __asm__ __volatile__ ( |
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293 "call *%4" |
| 0 | 294 : "=&D" (u1), "=&S" (u2) |
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295 : "0" (dstp), "1" (srcp), "r" (copy_row) |
| 0 | 296 : "memory" ); |
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297 #elif defined(_MSC_VER) || defined(__WATCOMC__) |
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298 { void *code = copy_row; |
| 0 | 299 __asm { |
| 300 push edi | |
| 301 push esi | |
| 302 | |
| 303 mov edi, dstp | |
| 304 mov esi, srcp | |
| 305 call dword ptr code | |
| 306 | |
| 307 pop esi | |
| 308 pop edi | |
| 309 } | |
| 310 } | |
| 311 #else | |
| 312 #error Need inline assembly for this compiler | |
| 313 #endif | |
| 314 break; | |
| 315 } | |
| 316 #else | |
| 317 switch (bpp) { | |
| 318 case 1: | |
| 319 copy_row1(srcp, srcrect->w, dstp, dstrect->w); | |
| 320 break; | |
| 321 case 2: | |
| 322 copy_row2((Uint16 *)srcp, srcrect->w, | |
| 323 (Uint16 *)dstp, dstrect->w); | |
| 324 break; | |
| 325 case 3: | |
| 326 copy_row3(srcp, srcrect->w, dstp, dstrect->w); | |
| 327 break; | |
| 328 case 4: | |
| 329 copy_row4((Uint32 *)srcp, srcrect->w, | |
| 330 (Uint32 *)dstp, dstrect->w); | |
| 331 break; | |
| 332 } | |
| 333 #endif | |
| 334 pos += inc; | |
| 335 } | |
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336 |
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337 /* We need to unlock the surfaces if they're locked */ |
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338 if ( dst_locked ) { |
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339 SDL_UnlockSurface(dst); |
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340 } |
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341 if ( src_locked ) { |
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342 SDL_UnlockSurface(src); |
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343 } |
| 0 | 344 return(0); |
| 345 } | |
| 346 |