Mercurial > sdl-ios-xcode
annotate src/video/SDL_stretch.c @ 1234:73676c1f56ee
For sanity's sake, removed the '&' when passing copy_row array to asm.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 06 Jan 2006 13:20:10 +0000 |
| parents | 228c94f0b5dc |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
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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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Updated the source with the correct e-mail address
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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 static unsigned char copy_row[4096]; | |
| 62 | |
| 63 static int generate_rowbytes(int src_w, int dst_w, int bpp) | |
| 64 { | |
| 65 static struct { | |
| 66 int bpp; | |
| 67 int src_w; | |
| 68 int dst_w; | |
| 69 } last; | |
| 70 | |
| 71 int i; | |
| 72 int pos, inc; | |
| 73 unsigned char *eip; | |
| 74 unsigned char load, store; | |
| 75 | |
| 76 /* See if we need to regenerate the copy buffer */ | |
| 77 if ( (src_w == last.src_w) && | |
|
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78 (dst_w == last.dst_w) && (bpp == last.bpp) ) { |
| 0 | 79 return(0); |
| 80 } | |
| 81 last.bpp = bpp; | |
| 82 last.src_w = src_w; | |
| 83 last.dst_w = dst_w; | |
| 84 | |
| 85 switch (bpp) { | |
| 86 case 1: | |
| 87 load = LOAD_BYTE; | |
| 88 store = STORE_BYTE; | |
| 89 break; | |
| 90 case 2: | |
| 91 case 4: | |
| 92 load = LOAD_WORD; | |
| 93 store = STORE_WORD; | |
| 94 break; | |
| 95 default: | |
| 96 SDL_SetError("ASM stretch of %d bytes isn't supported\n", bpp); | |
| 97 return(-1); | |
| 98 } | |
| 99 pos = 0x10000; | |
| 100 inc = (src_w << 16) / dst_w; | |
| 101 eip = copy_row; | |
| 102 for ( i=0; i<dst_w; ++i ) { | |
| 103 while ( pos >= 0x10000L ) { | |
| 104 if ( bpp == 2 ) { | |
| 105 *eip++ = PREFIX16; | |
| 106 } | |
| 107 *eip++ = load; | |
| 108 pos -= 0x10000L; | |
| 109 } | |
| 110 if ( bpp == 2 ) { | |
| 111 *eip++ = PREFIX16; | |
| 112 } | |
| 113 *eip++ = store; | |
| 114 pos += inc; | |
| 115 } | |
| 116 *eip++ = RETURN; | |
| 117 | |
| 118 /* Verify that we didn't overflow (too late) */ | |
| 119 if ( eip > (copy_row+sizeof(copy_row)) ) { | |
| 120 SDL_SetError("Copy buffer overflow"); | |
| 121 return(-1); | |
| 122 } | |
| 123 return(0); | |
| 124 } | |
| 125 | |
| 126 #else | |
| 127 | |
| 128 #define DEFINE_COPY_ROW(name, type) \ | |
| 129 void name(type *src, int src_w, type *dst, int dst_w) \ | |
| 130 { \ | |
| 131 int i; \ | |
| 132 int pos, inc; \ | |
| 133 type pixel = 0; \ | |
| 134 \ | |
| 135 pos = 0x10000; \ | |
| 136 inc = (src_w << 16) / dst_w; \ | |
| 137 for ( i=dst_w; i>0; --i ) { \ | |
| 138 while ( pos >= 0x10000L ) { \ | |
| 139 pixel = *src++; \ | |
| 140 pos -= 0x10000L; \ | |
| 141 } \ | |
| 142 *dst++ = pixel; \ | |
| 143 pos += inc; \ | |
| 144 } \ | |
| 145 } | |
| 146 DEFINE_COPY_ROW(copy_row1, Uint8) | |
| 147 DEFINE_COPY_ROW(copy_row2, Uint16) | |
| 148 DEFINE_COPY_ROW(copy_row4, Uint32) | |
| 149 | |
| 150 #endif /* USE_ASM_STRETCH */ | |
| 151 | |
| 152 /* The ASM code doesn't handle 24-bpp stretch blits */ | |
| 153 void copy_row3(Uint8 *src, int src_w, Uint8 *dst, int dst_w) | |
| 154 { | |
| 155 int i; | |
| 156 int pos, inc; | |
| 157 Uint8 pixel[3]; | |
| 158 | |
| 159 pos = 0x10000; | |
| 160 inc = (src_w << 16) / dst_w; | |
| 161 for ( i=dst_w; i>0; --i ) { | |
| 162 while ( pos >= 0x10000L ) { | |
| 163 pixel[0] = *src++; | |
| 164 pixel[1] = *src++; | |
| 165 pixel[2] = *src++; | |
| 166 pos -= 0x10000L; | |
| 167 } | |
| 168 *dst++ = pixel[0]; | |
| 169 *dst++ = pixel[1]; | |
| 170 *dst++ = pixel[2]; | |
| 171 pos += inc; | |
| 172 } | |
| 173 } | |
| 174 | |
| 175 /* Perform a stretch blit between two surfaces of the same format. | |
| 176 NOTE: This function is not safe to call from multiple threads! | |
| 177 */ | |
| 178 int SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect, | |
| 179 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 180 { | |
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parents:
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181 int src_locked; |
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parents:
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182 int dst_locked; |
| 0 | 183 int pos, inc; |
| 184 int dst_width; | |
| 185 int dst_maxrow; | |
| 186 int src_row, dst_row; | |
| 187 Uint8 *srcp = NULL; | |
| 188 Uint8 *dstp; | |
| 189 SDL_Rect full_src; | |
| 190 SDL_Rect full_dst; | |
| 191 #if defined(USE_ASM_STRETCH) && defined(__GNUC__) | |
| 192 int u1, u2; | |
| 193 #endif | |
| 194 const int bpp = dst->format->BytesPerPixel; | |
| 195 | |
| 196 if ( src->format->BitsPerPixel != dst->format->BitsPerPixel ) { | |
| 197 SDL_SetError("Only works with same format surfaces"); | |
| 198 return(-1); | |
| 199 } | |
| 200 | |
| 201 /* Verify the blit rectangles */ | |
| 202 if ( srcrect ) { | |
| 203 if ( (srcrect->x < 0) || (srcrect->y < 0) || | |
| 204 ((srcrect->x+srcrect->w) > src->w) || | |
| 205 ((srcrect->y+srcrect->h) > src->h) ) { | |
| 206 SDL_SetError("Invalid source blit rectangle"); | |
| 207 return(-1); | |
| 208 } | |
| 209 } else { | |
| 210 full_src.x = 0; | |
| 211 full_src.y = 0; | |
| 212 full_src.w = src->w; | |
| 213 full_src.h = src->h; | |
| 214 srcrect = &full_src; | |
| 215 } | |
| 216 if ( dstrect ) { | |
| 217 if ( (dstrect->x < 0) || (dstrect->y < 0) || | |
| 218 ((dstrect->x+dstrect->w) > dst->w) || | |
| 219 ((dstrect->y+dstrect->h) > dst->h) ) { | |
| 220 SDL_SetError("Invalid destination blit rectangle"); | |
| 221 return(-1); | |
| 222 } | |
| 223 } else { | |
| 224 full_dst.x = 0; | |
| 225 full_dst.y = 0; | |
| 226 full_dst.w = dst->w; | |
| 227 full_dst.h = dst->h; | |
| 228 dstrect = &full_dst; | |
| 229 } | |
| 230 | |
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231 /* Lock the destination if it's in hardware */ |
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232 dst_locked = 0; |
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233 if ( SDL_MUSTLOCK(dst) ) { |
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234 if ( SDL_LockSurface(dst) < 0 ) { |
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235 SDL_SetError("Unable to lock destination surface"); |
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236 return(-1); |
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237 } |
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238 dst_locked = 1; |
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239 } |
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240 /* Lock the source if it's in hardware */ |
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241 src_locked = 0; |
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242 if ( SDL_MUSTLOCK(src) ) { |
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243 if ( SDL_LockSurface(src) < 0 ) { |
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244 if ( dst_locked ) { |
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245 SDL_UnlockSurface(dst); |
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246 } |
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247 SDL_SetError("Unable to lock source surface"); |
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248 return(-1); |
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249 } |
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250 src_locked = 1; |
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251 } |
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252 |
| 0 | 253 /* Set up the data... */ |
| 254 pos = 0x10000; | |
| 255 inc = (srcrect->h << 16) / dstrect->h; | |
| 256 src_row = srcrect->y; | |
| 257 dst_row = dstrect->y; | |
| 258 dst_width = dstrect->w*bpp; | |
| 259 | |
| 260 #ifdef USE_ASM_STRETCH | |
| 261 /* Write the opcodes for this stretch */ | |
| 262 if ( (bpp != 3) && | |
| 263 (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0) ) { | |
| 264 return(-1); | |
| 265 } | |
| 266 #endif | |
| 267 | |
| 268 /* Perform the stretch blit */ | |
| 269 for ( dst_maxrow = dst_row+dstrect->h; dst_row<dst_maxrow; ++dst_row ) { | |
| 270 dstp = (Uint8 *)dst->pixels + (dst_row*dst->pitch) | |
| 271 + (dstrect->x*bpp); | |
| 272 while ( pos >= 0x10000L ) { | |
| 273 srcp = (Uint8 *)src->pixels + (src_row*src->pitch) | |
| 274 + (srcrect->x*bpp); | |
| 275 ++src_row; | |
| 276 pos -= 0x10000L; | |
| 277 } | |
| 278 #ifdef USE_ASM_STRETCH | |
| 279 switch (bpp) { | |
| 280 case 3: | |
| 281 copy_row3(srcp, srcrect->w, dstp, dstrect->w); | |
| 282 break; | |
| 283 default: | |
| 284 #ifdef __GNUC__ | |
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285 __asm__ __volatile__ ( |
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From Mike Frysinger and/or Gentoo:
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286 "call *%4" |
| 0 | 287 : "=&D" (u1), "=&S" (u2) |
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288 : "0" (dstp), "1" (srcp), "r" (copy_row) |
| 0 | 289 : "memory" ); |
| 290 #else | |
| 291 #ifdef WIN32 | |
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292 { void *code = copy_row; |
| 0 | 293 __asm { |
| 294 push edi | |
| 295 push esi | |
| 296 | |
| 297 mov edi, dstp | |
| 298 mov esi, srcp | |
| 299 call dword ptr code | |
| 300 | |
| 301 pop esi | |
| 302 pop edi | |
| 303 } | |
| 304 } | |
| 305 #else | |
| 306 #error Need inline assembly for this compiler | |
| 307 #endif | |
| 308 #endif /* __GNUC__ */ | |
| 309 break; | |
| 310 } | |
| 311 #else | |
| 312 switch (bpp) { | |
| 313 case 1: | |
| 314 copy_row1(srcp, srcrect->w, dstp, dstrect->w); | |
| 315 break; | |
| 316 case 2: | |
| 317 copy_row2((Uint16 *)srcp, srcrect->w, | |
| 318 (Uint16 *)dstp, dstrect->w); | |
| 319 break; | |
| 320 case 3: | |
| 321 copy_row3(srcp, srcrect->w, dstp, dstrect->w); | |
| 322 break; | |
| 323 case 4: | |
| 324 copy_row4((Uint32 *)srcp, srcrect->w, | |
| 325 (Uint32 *)dstp, dstrect->w); | |
| 326 break; | |
| 327 } | |
| 328 #endif | |
| 329 pos += inc; | |
| 330 } | |
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331 |
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parents:
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332 /* We need to unlock the surfaces if they're locked */ |
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333 if ( dst_locked ) { |
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334 SDL_UnlockSurface(dst); |
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335 } |
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336 if ( src_locked ) { |
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337 SDL_UnlockSurface(src); |
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338 } |
| 0 | 339 return(0); |
| 340 } | |
| 341 |