Mercurial > sdl-ios-xcode
annotate src/video/SDL_stretch.c @ 4109:cd2ab40f1219 SDL-1.2
Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 29 Dec 2007 05:18:33 +0000 |
| parents | 3feb94233f90 |
| children | a1b03ba2fcd0 |
| 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 | |
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Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
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45 #ifdef HAVE_MPROTECT |
| 4108 | 46 #include <sys/types.h> |
| 47 #include <sys/mman.h> | |
| 48 #endif | |
|
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49 #ifdef __GNUC__ |
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50 #define PAGE_ALIGNED __attribute__((__aligned__(4096))) |
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51 #else |
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Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
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52 #define PAGE_ALIGNED |
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53 #endif |
| 4108 | 54 |
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55 #if defined(_M_IX86) || defined(i386) |
| 0 | 56 #define PREFIX16 0x66 |
| 57 #define STORE_BYTE 0xAA | |
| 58 #define STORE_WORD 0xAB | |
| 59 #define LOAD_BYTE 0xAC | |
| 60 #define LOAD_WORD 0xAD | |
| 61 #define RETURN 0xC3 | |
| 62 #else | |
| 63 #error Need assembly opcodes for this architecture | |
| 64 #endif | |
| 65 | |
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66 static unsigned char copy_row[4096] PAGE_ALIGNED; |
| 0 | 67 |
| 68 static int generate_rowbytes(int src_w, int dst_w, int bpp) | |
| 69 { | |
| 70 static struct { | |
| 71 int bpp; | |
| 72 int src_w; | |
| 73 int dst_w; | |
|
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74 int status; |
| 0 | 75 } last; |
| 76 | |
| 77 int i; | |
| 78 int pos, inc; | |
| 79 unsigned char *eip; | |
| 80 unsigned char load, store; | |
| 81 | |
| 82 /* See if we need to regenerate the copy buffer */ | |
| 83 if ( (src_w == last.src_w) && | |
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84 (dst_w == last.dst_w) && (bpp == last.bpp) ) { |
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85 return(last.status); |
| 0 | 86 } |
| 87 last.bpp = bpp; | |
| 88 last.src_w = src_w; | |
| 89 last.dst_w = dst_w; | |
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90 last.status = -1; |
| 0 | 91 |
| 92 switch (bpp) { | |
| 93 case 1: | |
| 94 load = LOAD_BYTE; | |
| 95 store = STORE_BYTE; | |
| 96 break; | |
| 97 case 2: | |
| 98 case 4: | |
| 99 load = LOAD_WORD; | |
| 100 store = STORE_WORD; | |
| 101 break; | |
| 102 default: | |
| 103 SDL_SetError("ASM stretch of %d bytes isn't supported\n", bpp); | |
| 104 return(-1); | |
| 105 } | |
| 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 | |
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125 /* Verify that we didn't overflow (too late!!!) */ |
| 0 | 126 if ( eip > (copy_row+sizeof(copy_row)) ) { |
| 127 SDL_SetError("Copy buffer overflow"); | |
| 128 return(-1); | |
| 129 } | |
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130 #ifdef HAVE_MPROTECT |
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131 /* Make the code executable */ |
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132 if ( mprotect(copy_row, sizeof(copy_row), PROT_READ|PROT_WRITE|PROT_EXEC) < 0 ) { |
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133 SDL_SetError("Couldn't make copy buffer executable"); |
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134 return(-1); |
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135 } |
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136 #endif |
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137 last.status = 0; |
| 0 | 138 return(0); |
| 139 } | |
| 140 | |
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141 #endif /* USE_ASM_STRETCH */ |
| 0 | 142 |
| 143 #define DEFINE_COPY_ROW(name, type) \ | |
| 144 void name(type *src, int src_w, type *dst, int dst_w) \ | |
| 145 { \ | |
| 146 int i; \ | |
| 147 int pos, inc; \ | |
| 148 type pixel = 0; \ | |
| 149 \ | |
| 150 pos = 0x10000; \ | |
| 151 inc = (src_w << 16) / dst_w; \ | |
| 152 for ( i=dst_w; i>0; --i ) { \ | |
| 153 while ( pos >= 0x10000L ) { \ | |
| 154 pixel = *src++; \ | |
| 155 pos -= 0x10000L; \ | |
| 156 } \ | |
| 157 *dst++ = pixel; \ | |
| 158 pos += inc; \ | |
| 159 } \ | |
| 160 } | |
| 161 DEFINE_COPY_ROW(copy_row1, Uint8) | |
| 162 DEFINE_COPY_ROW(copy_row2, Uint16) | |
| 163 DEFINE_COPY_ROW(copy_row4, Uint32) | |
| 164 | |
| 165 /* The ASM code doesn't handle 24-bpp stretch blits */ | |
| 166 void copy_row3(Uint8 *src, int src_w, Uint8 *dst, int dst_w) | |
| 167 { | |
| 168 int i; | |
| 169 int pos, inc; | |
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170 Uint8 pixel[3] = { 0, 0, 0 }; |
| 0 | 171 |
| 172 pos = 0x10000; | |
| 173 inc = (src_w << 16) / dst_w; | |
| 174 for ( i=dst_w; i>0; --i ) { | |
| 175 while ( pos >= 0x10000L ) { | |
| 176 pixel[0] = *src++; | |
| 177 pixel[1] = *src++; | |
| 178 pixel[2] = *src++; | |
| 179 pos -= 0x10000L; | |
| 180 } | |
| 181 *dst++ = pixel[0]; | |
| 182 *dst++ = pixel[1]; | |
| 183 *dst++ = pixel[2]; | |
| 184 pos += inc; | |
| 185 } | |
| 186 } | |
| 187 | |
| 188 /* Perform a stretch blit between two surfaces of the same format. | |
| 189 NOTE: This function is not safe to call from multiple threads! | |
| 190 */ | |
| 191 int SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect, | |
| 192 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 193 { | |
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194 int src_locked; |
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195 int dst_locked; |
| 0 | 196 int pos, inc; |
| 197 int dst_width; | |
| 198 int dst_maxrow; | |
| 199 int src_row, dst_row; | |
| 200 Uint8 *srcp = NULL; | |
| 201 Uint8 *dstp; | |
| 202 SDL_Rect full_src; | |
| 203 SDL_Rect full_dst; | |
|
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204 #ifdef USE_ASM_STRETCH |
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205 SDL_bool use_asm = SDL_TRUE; |
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206 #ifdef __GNUC__ |
| 0 | 207 int u1, u2; |
| 208 #endif | |
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209 #endif /* USE_ASM_STRETCH */ |
| 0 | 210 const int bpp = dst->format->BytesPerPixel; |
| 211 | |
| 212 if ( src->format->BitsPerPixel != dst->format->BitsPerPixel ) { | |
| 213 SDL_SetError("Only works with same format surfaces"); | |
| 214 return(-1); | |
| 215 } | |
| 216 | |
| 217 /* Verify the blit rectangles */ | |
| 218 if ( srcrect ) { | |
| 219 if ( (srcrect->x < 0) || (srcrect->y < 0) || | |
| 220 ((srcrect->x+srcrect->w) > src->w) || | |
| 221 ((srcrect->y+srcrect->h) > src->h) ) { | |
| 222 SDL_SetError("Invalid source blit rectangle"); | |
| 223 return(-1); | |
| 224 } | |
| 225 } else { | |
| 226 full_src.x = 0; | |
| 227 full_src.y = 0; | |
| 228 full_src.w = src->w; | |
| 229 full_src.h = src->h; | |
| 230 srcrect = &full_src; | |
| 231 } | |
| 232 if ( dstrect ) { | |
| 233 if ( (dstrect->x < 0) || (dstrect->y < 0) || | |
| 234 ((dstrect->x+dstrect->w) > dst->w) || | |
| 235 ((dstrect->y+dstrect->h) > dst->h) ) { | |
| 236 SDL_SetError("Invalid destination blit rectangle"); | |
| 237 return(-1); | |
| 238 } | |
| 239 } else { | |
| 240 full_dst.x = 0; | |
| 241 full_dst.y = 0; | |
| 242 full_dst.w = dst->w; | |
| 243 full_dst.h = dst->h; | |
| 244 dstrect = &full_dst; | |
| 245 } | |
| 246 | |
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247 /* Lock the destination if it's in hardware */ |
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248 dst_locked = 0; |
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249 if ( SDL_MUSTLOCK(dst) ) { |
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250 if ( SDL_LockSurface(dst) < 0 ) { |
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251 SDL_SetError("Unable to lock destination surface"); |
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252 return(-1); |
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253 } |
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254 dst_locked = 1; |
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255 } |
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256 /* Lock the source if it's in hardware */ |
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257 src_locked = 0; |
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258 if ( SDL_MUSTLOCK(src) ) { |
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259 if ( SDL_LockSurface(src) < 0 ) { |
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260 if ( dst_locked ) { |
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261 SDL_UnlockSurface(dst); |
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262 } |
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263 SDL_SetError("Unable to lock source surface"); |
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264 return(-1); |
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265 } |
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266 src_locked = 1; |
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267 } |
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268 |
| 0 | 269 /* Set up the data... */ |
| 270 pos = 0x10000; | |
| 271 inc = (srcrect->h << 16) / dstrect->h; | |
| 272 src_row = srcrect->y; | |
| 273 dst_row = dstrect->y; | |
| 274 dst_width = dstrect->w*bpp; | |
| 275 | |
| 276 #ifdef USE_ASM_STRETCH | |
| 277 /* Write the opcodes for this stretch */ | |
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278 if ( (bpp == 3) || |
| 0 | 279 (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0) ) { |
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280 use_asm = SDL_FALSE; |
| 0 | 281 } |
| 282 #endif | |
| 283 | |
| 284 /* Perform the stretch blit */ | |
| 285 for ( dst_maxrow = dst_row+dstrect->h; dst_row<dst_maxrow; ++dst_row ) { | |
| 286 dstp = (Uint8 *)dst->pixels + (dst_row*dst->pitch) | |
| 287 + (dstrect->x*bpp); | |
| 288 while ( pos >= 0x10000L ) { | |
| 289 srcp = (Uint8 *)src->pixels + (src_row*src->pitch) | |
| 290 + (srcrect->x*bpp); | |
| 291 ++src_row; | |
| 292 pos -= 0x10000L; | |
| 293 } | |
| 294 #ifdef USE_ASM_STRETCH | |
|
4109
cd2ab40f1219
Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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295 if (use_asm) { |
| 0 | 296 #ifdef __GNUC__ |
|
627
8b9ac38381d0
Fixed compile problem in SDL_stretch.c with gcc 3.3
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
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297 __asm__ __volatile__ ( |
|
1228
f4a3a4129d04
From Mike Frysinger and/or Gentoo:
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parents:
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298 "call *%4" |
| 0 | 299 : "=&D" (u1), "=&S" (u2) |
|
1234
73676c1f56ee
For sanity's sake, removed the '&' when passing copy_row array to asm.
Ryan C. Gordon <icculus@icculus.org>
parents:
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diff
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300 : "0" (dstp), "1" (srcp), "r" (copy_row) |
| 0 | 301 : "memory" ); |
|
1442
e3242177fe4a
Updated OS/2 build, yay!
Sam Lantinga <slouken@libsdl.org>
parents:
1402
diff
changeset
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302 #elif defined(_MSC_VER) || defined(__WATCOMC__) |
|
1234
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For sanity's sake, removed the '&' when passing copy_row array to asm.
Ryan C. Gordon <icculus@icculus.org>
parents:
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diff
changeset
|
303 { void *code = copy_row; |
| 0 | 304 __asm { |
| 305 push edi | |
| 306 push esi | |
| 307 | |
| 308 mov edi, dstp | |
| 309 mov esi, srcp | |
| 310 call dword ptr code | |
| 311 | |
| 312 pop esi | |
| 313 pop edi | |
| 314 } | |
| 315 } | |
| 316 #else | |
| 317 #error Need inline assembly for this compiler | |
| 318 #endif | |
|
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Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
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319 } else |
|
cd2ab40f1219
Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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320 #endif |
| 0 | 321 switch (bpp) { |
| 322 case 1: | |
| 323 copy_row1(srcp, srcrect->w, dstp, dstrect->w); | |
| 324 break; | |
| 325 case 2: | |
| 326 copy_row2((Uint16 *)srcp, srcrect->w, | |
| 327 (Uint16 *)dstp, dstrect->w); | |
| 328 break; | |
| 329 case 3: | |
| 330 copy_row3(srcp, srcrect->w, dstp, dstrect->w); | |
| 331 break; | |
| 332 case 4: | |
| 333 copy_row4((Uint32 *)srcp, srcrect->w, | |
| 334 (Uint32 *)dstp, dstrect->w); | |
| 335 break; | |
| 336 } | |
| 337 pos += inc; | |
| 338 } | |
|
894
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
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339 |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
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parents:
769
diff
changeset
|
340 /* We need to unlock the surfaces if they're locked */ |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
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parents:
769
diff
changeset
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341 if ( dst_locked ) { |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
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parents:
769
diff
changeset
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342 SDL_UnlockSurface(dst); |
|
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Don't crash if the stretch routines are used on hardware surfaces
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parents:
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diff
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|
343 } |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
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344 if ( src_locked ) { |
|
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Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
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345 SDL_UnlockSurface(src); |
|
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Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
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346 } |
| 0 | 347 return(0); |
| 348 } | |
| 349 |