Mercurial > sdl-ios-xcode
annotate src/video/SDL_stretch.c @ 1387:835c1831f903
Tests require SDL 1.2.10
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 20 Feb 2006 10:19:47 +0000 |
| parents | 19418e4422cb |
| children | d910939febfa |
| 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 /* This a stretch blit implementation based on ideas given to me by | |
| 24 Tomasz Cejner - thanks! :) | |
| 25 | |
| 26 April 27, 2000 - Sam Lantinga | |
| 27 */ | |
| 28 | |
| 29 #include "SDL_video.h" | |
| 30 #include "SDL_blit.h" | |
| 31 | |
| 32 /* This isn't ready for general consumption yet - it should be folded | |
| 33 into the general blitting mechanism. | |
| 34 */ | |
| 35 | |
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36 #if ((defined(_MFC_VER) && defined(_M_IX86)/* && !defined(_WIN32_WCE) still needed? */) || \ |
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37 (defined(i386) && defined(__GNUC__))) && SDL_ASSEMBLY_BLITTERS |
| 0 | 38 #define USE_ASM_STRETCH |
| 39 #endif | |
| 40 | |
| 41 #ifdef USE_ASM_STRETCH | |
| 42 | |
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43 #if defined(_M_IX86) || defined(i386) |
| 0 | 44 #define PREFIX16 0x66 |
| 45 #define STORE_BYTE 0xAA | |
| 46 #define STORE_WORD 0xAB | |
| 47 #define LOAD_BYTE 0xAC | |
| 48 #define LOAD_WORD 0xAD | |
| 49 #define RETURN 0xC3 | |
| 50 #else | |
| 51 #error Need assembly opcodes for this architecture | |
| 52 #endif | |
| 53 | |
| 54 static unsigned char copy_row[4096]; | |
| 55 | |
| 56 static int generate_rowbytes(int src_w, int dst_w, int bpp) | |
| 57 { | |
| 58 static struct { | |
| 59 int bpp; | |
| 60 int src_w; | |
| 61 int dst_w; | |
| 62 } last; | |
| 63 | |
| 64 int i; | |
| 65 int pos, inc; | |
| 66 unsigned char *eip; | |
| 67 unsigned char load, store; | |
| 68 | |
| 69 /* See if we need to regenerate the copy buffer */ | |
| 70 if ( (src_w == last.src_w) && | |
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71 (dst_w == last.dst_w) && (bpp == last.bpp) ) { |
| 0 | 72 return(0); |
| 73 } | |
| 74 last.bpp = bpp; | |
| 75 last.src_w = src_w; | |
| 76 last.dst_w = dst_w; | |
| 77 | |
| 78 switch (bpp) { | |
| 79 case 1: | |
| 80 load = LOAD_BYTE; | |
| 81 store = STORE_BYTE; | |
| 82 break; | |
| 83 case 2: | |
| 84 case 4: | |
| 85 load = LOAD_WORD; | |
| 86 store = STORE_WORD; | |
| 87 break; | |
| 88 default: | |
| 89 SDL_SetError("ASM stretch of %d bytes isn't supported\n", bpp); | |
| 90 return(-1); | |
| 91 } | |
| 92 pos = 0x10000; | |
| 93 inc = (src_w << 16) / dst_w; | |
| 94 eip = copy_row; | |
| 95 for ( i=0; i<dst_w; ++i ) { | |
| 96 while ( pos >= 0x10000L ) { | |
| 97 if ( bpp == 2 ) { | |
| 98 *eip++ = PREFIX16; | |
| 99 } | |
| 100 *eip++ = load; | |
| 101 pos -= 0x10000L; | |
| 102 } | |
| 103 if ( bpp == 2 ) { | |
| 104 *eip++ = PREFIX16; | |
| 105 } | |
| 106 *eip++ = store; | |
| 107 pos += inc; | |
| 108 } | |
| 109 *eip++ = RETURN; | |
| 110 | |
| 111 /* Verify that we didn't overflow (too late) */ | |
| 112 if ( eip > (copy_row+sizeof(copy_row)) ) { | |
| 113 SDL_SetError("Copy buffer overflow"); | |
| 114 return(-1); | |
| 115 } | |
| 116 return(0); | |
| 117 } | |
| 118 | |
| 119 #else | |
| 120 | |
| 121 #define DEFINE_COPY_ROW(name, type) \ | |
| 122 void name(type *src, int src_w, type *dst, int dst_w) \ | |
| 123 { \ | |
| 124 int i; \ | |
| 125 int pos, inc; \ | |
| 126 type pixel = 0; \ | |
| 127 \ | |
| 128 pos = 0x10000; \ | |
| 129 inc = (src_w << 16) / dst_w; \ | |
| 130 for ( i=dst_w; i>0; --i ) { \ | |
| 131 while ( pos >= 0x10000L ) { \ | |
| 132 pixel = *src++; \ | |
| 133 pos -= 0x10000L; \ | |
| 134 } \ | |
| 135 *dst++ = pixel; \ | |
| 136 pos += inc; \ | |
| 137 } \ | |
| 138 } | |
| 139 DEFINE_COPY_ROW(copy_row1, Uint8) | |
| 140 DEFINE_COPY_ROW(copy_row2, Uint16) | |
| 141 DEFINE_COPY_ROW(copy_row4, Uint32) | |
| 142 | |
| 143 #endif /* USE_ASM_STRETCH */ | |
| 144 | |
| 145 /* The ASM code doesn't handle 24-bpp stretch blits */ | |
| 146 void copy_row3(Uint8 *src, int src_w, Uint8 *dst, int dst_w) | |
| 147 { | |
| 148 int i; | |
| 149 int pos, inc; | |
| 150 Uint8 pixel[3]; | |
| 151 | |
| 152 pos = 0x10000; | |
| 153 inc = (src_w << 16) / dst_w; | |
| 154 for ( i=dst_w; i>0; --i ) { | |
| 155 while ( pos >= 0x10000L ) { | |
| 156 pixel[0] = *src++; | |
| 157 pixel[1] = *src++; | |
| 158 pixel[2] = *src++; | |
| 159 pos -= 0x10000L; | |
| 160 } | |
| 161 *dst++ = pixel[0]; | |
| 162 *dst++ = pixel[1]; | |
| 163 *dst++ = pixel[2]; | |
| 164 pos += inc; | |
| 165 } | |
| 166 } | |
| 167 | |
| 168 /* Perform a stretch blit between two surfaces of the same format. | |
| 169 NOTE: This function is not safe to call from multiple threads! | |
| 170 */ | |
| 171 int SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect, | |
| 172 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 173 { | |
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174 int src_locked; |
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175 int dst_locked; |
| 0 | 176 int pos, inc; |
| 177 int dst_width; | |
| 178 int dst_maxrow; | |
| 179 int src_row, dst_row; | |
| 180 Uint8 *srcp = NULL; | |
| 181 Uint8 *dstp; | |
| 182 SDL_Rect full_src; | |
| 183 SDL_Rect full_dst; | |
| 184 #if defined(USE_ASM_STRETCH) && defined(__GNUC__) | |
| 185 int u1, u2; | |
| 186 #endif | |
| 187 const int bpp = dst->format->BytesPerPixel; | |
| 188 | |
| 189 if ( src->format->BitsPerPixel != dst->format->BitsPerPixel ) { | |
| 190 SDL_SetError("Only works with same format surfaces"); | |
| 191 return(-1); | |
| 192 } | |
| 193 | |
| 194 /* Verify the blit rectangles */ | |
| 195 if ( srcrect ) { | |
| 196 if ( (srcrect->x < 0) || (srcrect->y < 0) || | |
| 197 ((srcrect->x+srcrect->w) > src->w) || | |
| 198 ((srcrect->y+srcrect->h) > src->h) ) { | |
| 199 SDL_SetError("Invalid source blit rectangle"); | |
| 200 return(-1); | |
| 201 } | |
| 202 } else { | |
| 203 full_src.x = 0; | |
| 204 full_src.y = 0; | |
| 205 full_src.w = src->w; | |
| 206 full_src.h = src->h; | |
| 207 srcrect = &full_src; | |
| 208 } | |
| 209 if ( dstrect ) { | |
| 210 if ( (dstrect->x < 0) || (dstrect->y < 0) || | |
| 211 ((dstrect->x+dstrect->w) > dst->w) || | |
| 212 ((dstrect->y+dstrect->h) > dst->h) ) { | |
| 213 SDL_SetError("Invalid destination blit rectangle"); | |
| 214 return(-1); | |
| 215 } | |
| 216 } else { | |
| 217 full_dst.x = 0; | |
| 218 full_dst.y = 0; | |
| 219 full_dst.w = dst->w; | |
| 220 full_dst.h = dst->h; | |
| 221 dstrect = &full_dst; | |
| 222 } | |
| 223 | |
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224 /* Lock the destination if it's in hardware */ |
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225 dst_locked = 0; |
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226 if ( SDL_MUSTLOCK(dst) ) { |
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227 if ( SDL_LockSurface(dst) < 0 ) { |
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228 SDL_SetError("Unable to lock destination surface"); |
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229 return(-1); |
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230 } |
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231 dst_locked = 1; |
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232 } |
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233 /* Lock the source if it's in hardware */ |
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234 src_locked = 0; |
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235 if ( SDL_MUSTLOCK(src) ) { |
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236 if ( SDL_LockSurface(src) < 0 ) { |
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237 if ( dst_locked ) { |
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238 SDL_UnlockSurface(dst); |
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239 } |
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240 SDL_SetError("Unable to lock source surface"); |
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241 return(-1); |
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242 } |
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243 src_locked = 1; |
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244 } |
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245 |
| 0 | 246 /* Set up the data... */ |
| 247 pos = 0x10000; | |
| 248 inc = (srcrect->h << 16) / dstrect->h; | |
| 249 src_row = srcrect->y; | |
| 250 dst_row = dstrect->y; | |
| 251 dst_width = dstrect->w*bpp; | |
| 252 | |
| 253 #ifdef USE_ASM_STRETCH | |
| 254 /* Write the opcodes for this stretch */ | |
| 255 if ( (bpp != 3) && | |
| 256 (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0) ) { | |
| 257 return(-1); | |
| 258 } | |
| 259 #endif | |
| 260 | |
| 261 /* Perform the stretch blit */ | |
| 262 for ( dst_maxrow = dst_row+dstrect->h; dst_row<dst_maxrow; ++dst_row ) { | |
| 263 dstp = (Uint8 *)dst->pixels + (dst_row*dst->pitch) | |
| 264 + (dstrect->x*bpp); | |
| 265 while ( pos >= 0x10000L ) { | |
| 266 srcp = (Uint8 *)src->pixels + (src_row*src->pitch) | |
| 267 + (srcrect->x*bpp); | |
| 268 ++src_row; | |
| 269 pos -= 0x10000L; | |
| 270 } | |
| 271 #ifdef USE_ASM_STRETCH | |
| 272 switch (bpp) { | |
| 273 case 3: | |
| 274 copy_row3(srcp, srcrect->w, dstp, dstrect->w); | |
| 275 break; | |
| 276 default: | |
| 277 #ifdef __GNUC__ | |
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278 __asm__ __volatile__ ( |
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279 "call *%4" |
| 0 | 280 : "=&D" (u1), "=&S" (u2) |
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281 : "0" (dstp), "1" (srcp), "r" (copy_row) |
| 0 | 282 : "memory" ); |
| 283 #else | |
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284 #ifdef _MSC_VER |
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285 { void *code = copy_row; |
| 0 | 286 __asm { |
| 287 push edi | |
| 288 push esi | |
| 289 | |
| 290 mov edi, dstp | |
| 291 mov esi, srcp | |
| 292 call dword ptr code | |
| 293 | |
| 294 pop esi | |
| 295 pop edi | |
| 296 } | |
| 297 } | |
| 298 #else | |
| 299 #error Need inline assembly for this compiler | |
| 300 #endif | |
| 301 #endif /* __GNUC__ */ | |
| 302 break; | |
| 303 } | |
| 304 #else | |
| 305 switch (bpp) { | |
| 306 case 1: | |
| 307 copy_row1(srcp, srcrect->w, dstp, dstrect->w); | |
| 308 break; | |
| 309 case 2: | |
| 310 copy_row2((Uint16 *)srcp, srcrect->w, | |
| 311 (Uint16 *)dstp, dstrect->w); | |
| 312 break; | |
| 313 case 3: | |
| 314 copy_row3(srcp, srcrect->w, dstp, dstrect->w); | |
| 315 break; | |
| 316 case 4: | |
| 317 copy_row4((Uint32 *)srcp, srcrect->w, | |
| 318 (Uint32 *)dstp, dstrect->w); | |
| 319 break; | |
| 320 } | |
| 321 #endif | |
| 322 pos += inc; | |
| 323 } | |
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324 |
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325 /* We need to unlock the surfaces if they're locked */ |
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326 if ( dst_locked ) { |
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327 SDL_UnlockSurface(dst); |
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328 } |
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329 if ( src_locked ) { |
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330 SDL_UnlockSurface(src); |
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331 } |
| 0 | 332 return(0); |
| 333 } | |
| 334 |