Mercurial > sdl-ios-xcode
annotate src/video/SDL_stretch.c @ 1800:cc6bea4bb90d
Removed unused variable
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 10 May 2006 06:07:47 +0000 |
| parents | e3242177fe4a |
| children | 782fd950bd46 b5a4ac87b98c |
| 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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45 #if defined(_M_IX86) || defined(i386) |
| 0 | 46 #define PREFIX16 0x66 |
| 47 #define STORE_BYTE 0xAA | |
| 48 #define STORE_WORD 0xAB | |
| 49 #define LOAD_BYTE 0xAC | |
| 50 #define LOAD_WORD 0xAD | |
| 51 #define RETURN 0xC3 | |
| 52 #else | |
| 53 #error Need assembly opcodes for this architecture | |
| 54 #endif | |
| 55 | |
| 56 static unsigned char copy_row[4096]; | |
| 57 | |
| 58 static int generate_rowbytes(int src_w, int dst_w, int bpp) | |
| 59 { | |
| 60 static struct { | |
| 61 int bpp; | |
| 62 int src_w; | |
| 63 int dst_w; | |
| 64 } last; | |
| 65 | |
| 66 int i; | |
| 67 int pos, inc; | |
| 68 unsigned char *eip; | |
| 69 unsigned char load, store; | |
| 70 | |
| 71 /* See if we need to regenerate the copy buffer */ | |
| 72 if ( (src_w == last.src_w) && | |
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73 (dst_w == last.dst_w) && (bpp == last.bpp) ) { |
| 0 | 74 return(0); |
| 75 } | |
| 76 last.bpp = bpp; | |
| 77 last.src_w = src_w; | |
| 78 last.dst_w = dst_w; | |
| 79 | |
| 80 switch (bpp) { | |
| 81 case 1: | |
| 82 load = LOAD_BYTE; | |
| 83 store = STORE_BYTE; | |
| 84 break; | |
| 85 case 2: | |
| 86 case 4: | |
| 87 load = LOAD_WORD; | |
| 88 store = STORE_WORD; | |
| 89 break; | |
| 90 default: | |
| 91 SDL_SetError("ASM stretch of %d bytes isn't supported\n", bpp); | |
| 92 return(-1); | |
| 93 } | |
| 94 pos = 0x10000; | |
| 95 inc = (src_w << 16) / dst_w; | |
| 96 eip = copy_row; | |
| 97 for ( i=0; i<dst_w; ++i ) { | |
| 98 while ( pos >= 0x10000L ) { | |
| 99 if ( bpp == 2 ) { | |
| 100 *eip++ = PREFIX16; | |
| 101 } | |
| 102 *eip++ = load; | |
| 103 pos -= 0x10000L; | |
| 104 } | |
| 105 if ( bpp == 2 ) { | |
| 106 *eip++ = PREFIX16; | |
| 107 } | |
| 108 *eip++ = store; | |
| 109 pos += inc; | |
| 110 } | |
| 111 *eip++ = RETURN; | |
| 112 | |
| 113 /* Verify that we didn't overflow (too late) */ | |
| 114 if ( eip > (copy_row+sizeof(copy_row)) ) { | |
| 115 SDL_SetError("Copy buffer overflow"); | |
| 116 return(-1); | |
| 117 } | |
| 118 return(0); | |
| 119 } | |
| 120 | |
| 121 #else | |
| 122 | |
| 123 #define DEFINE_COPY_ROW(name, type) \ | |
| 124 void name(type *src, int src_w, type *dst, int dst_w) \ | |
| 125 { \ | |
| 126 int i; \ | |
| 127 int pos, inc; \ | |
| 128 type pixel = 0; \ | |
| 129 \ | |
| 130 pos = 0x10000; \ | |
| 131 inc = (src_w << 16) / dst_w; \ | |
| 132 for ( i=dst_w; i>0; --i ) { \ | |
| 133 while ( pos >= 0x10000L ) { \ | |
| 134 pixel = *src++; \ | |
| 135 pos -= 0x10000L; \ | |
| 136 } \ | |
| 137 *dst++ = pixel; \ | |
| 138 pos += inc; \ | |
| 139 } \ | |
| 140 } | |
| 141 DEFINE_COPY_ROW(copy_row1, Uint8) | |
| 142 DEFINE_COPY_ROW(copy_row2, Uint16) | |
| 143 DEFINE_COPY_ROW(copy_row4, Uint32) | |
| 144 | |
| 145 #endif /* USE_ASM_STRETCH */ | |
| 146 | |
| 147 /* The ASM code doesn't handle 24-bpp stretch blits */ | |
| 148 void copy_row3(Uint8 *src, int src_w, Uint8 *dst, int dst_w) | |
| 149 { | |
| 150 int i; | |
| 151 int pos, inc; | |
| 152 Uint8 pixel[3]; | |
| 153 | |
| 154 pos = 0x10000; | |
| 155 inc = (src_w << 16) / dst_w; | |
| 156 for ( i=dst_w; i>0; --i ) { | |
| 157 while ( pos >= 0x10000L ) { | |
| 158 pixel[0] = *src++; | |
| 159 pixel[1] = *src++; | |
| 160 pixel[2] = *src++; | |
| 161 pos -= 0x10000L; | |
| 162 } | |
| 163 *dst++ = pixel[0]; | |
| 164 *dst++ = pixel[1]; | |
| 165 *dst++ = pixel[2]; | |
| 166 pos += inc; | |
| 167 } | |
| 168 } | |
| 169 | |
| 170 /* Perform a stretch blit between two surfaces of the same format. | |
| 171 NOTE: This function is not safe to call from multiple threads! | |
| 172 */ | |
| 173 int SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect, | |
| 174 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 175 { | |
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176 int src_locked; |
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177 int dst_locked; |
| 0 | 178 int pos, inc; |
| 179 int dst_width; | |
| 180 int dst_maxrow; | |
| 181 int src_row, dst_row; | |
| 182 Uint8 *srcp = NULL; | |
| 183 Uint8 *dstp; | |
| 184 SDL_Rect full_src; | |
| 185 SDL_Rect full_dst; | |
| 186 #if defined(USE_ASM_STRETCH) && defined(__GNUC__) | |
| 187 int u1, u2; | |
| 188 #endif | |
| 189 const int bpp = dst->format->BytesPerPixel; | |
| 190 | |
| 191 if ( src->format->BitsPerPixel != dst->format->BitsPerPixel ) { | |
| 192 SDL_SetError("Only works with same format surfaces"); | |
| 193 return(-1); | |
| 194 } | |
| 195 | |
| 196 /* Verify the blit rectangles */ | |
| 197 if ( srcrect ) { | |
| 198 if ( (srcrect->x < 0) || (srcrect->y < 0) || | |
| 199 ((srcrect->x+srcrect->w) > src->w) || | |
| 200 ((srcrect->y+srcrect->h) > src->h) ) { | |
| 201 SDL_SetError("Invalid source blit rectangle"); | |
| 202 return(-1); | |
| 203 } | |
| 204 } else { | |
| 205 full_src.x = 0; | |
| 206 full_src.y = 0; | |
| 207 full_src.w = src->w; | |
| 208 full_src.h = src->h; | |
| 209 srcrect = &full_src; | |
| 210 } | |
| 211 if ( dstrect ) { | |
| 212 if ( (dstrect->x < 0) || (dstrect->y < 0) || | |
| 213 ((dstrect->x+dstrect->w) > dst->w) || | |
| 214 ((dstrect->y+dstrect->h) > dst->h) ) { | |
| 215 SDL_SetError("Invalid destination blit rectangle"); | |
| 216 return(-1); | |
| 217 } | |
| 218 } else { | |
| 219 full_dst.x = 0; | |
| 220 full_dst.y = 0; | |
| 221 full_dst.w = dst->w; | |
| 222 full_dst.h = dst->h; | |
| 223 dstrect = &full_dst; | |
| 224 } | |
| 225 | |
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226 /* Lock the destination if it's in hardware */ |
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227 dst_locked = 0; |
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228 if ( SDL_MUSTLOCK(dst) ) { |
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229 if ( SDL_LockSurface(dst) < 0 ) { |
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230 SDL_SetError("Unable to lock destination surface"); |
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231 return(-1); |
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232 } |
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233 dst_locked = 1; |
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234 } |
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235 /* Lock the source if it's in hardware */ |
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236 src_locked = 0; |
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237 if ( SDL_MUSTLOCK(src) ) { |
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238 if ( SDL_LockSurface(src) < 0 ) { |
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239 if ( dst_locked ) { |
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240 SDL_UnlockSurface(dst); |
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241 } |
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242 SDL_SetError("Unable to lock source surface"); |
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243 return(-1); |
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244 } |
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245 src_locked = 1; |
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246 } |
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247 |
| 0 | 248 /* Set up the data... */ |
| 249 pos = 0x10000; | |
| 250 inc = (srcrect->h << 16) / dstrect->h; | |
| 251 src_row = srcrect->y; | |
| 252 dst_row = dstrect->y; | |
| 253 dst_width = dstrect->w*bpp; | |
| 254 | |
| 255 #ifdef USE_ASM_STRETCH | |
| 256 /* Write the opcodes for this stretch */ | |
| 257 if ( (bpp != 3) && | |
| 258 (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0) ) { | |
| 259 return(-1); | |
| 260 } | |
| 261 #endif | |
| 262 | |
| 263 /* Perform the stretch blit */ | |
| 264 for ( dst_maxrow = dst_row+dstrect->h; dst_row<dst_maxrow; ++dst_row ) { | |
| 265 dstp = (Uint8 *)dst->pixels + (dst_row*dst->pitch) | |
| 266 + (dstrect->x*bpp); | |
| 267 while ( pos >= 0x10000L ) { | |
| 268 srcp = (Uint8 *)src->pixels + (src_row*src->pitch) | |
| 269 + (srcrect->x*bpp); | |
| 270 ++src_row; | |
| 271 pos -= 0x10000L; | |
| 272 } | |
| 273 #ifdef USE_ASM_STRETCH | |
| 274 switch (bpp) { | |
| 275 case 3: | |
| 276 copy_row3(srcp, srcrect->w, dstp, dstrect->w); | |
| 277 break; | |
| 278 default: | |
| 279 #ifdef __GNUC__ | |
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280 __asm__ __volatile__ ( |
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281 "call *%4" |
| 0 | 282 : "=&D" (u1), "=&S" (u2) |
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283 : "0" (dstp), "1" (srcp), "r" (copy_row) |
| 0 | 284 : "memory" ); |
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285 #elif defined(_MSC_VER) || defined(__WATCOMC__) |
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286 { void *code = copy_row; |
| 0 | 287 __asm { |
| 288 push edi | |
| 289 push esi | |
| 290 | |
| 291 mov edi, dstp | |
| 292 mov esi, srcp | |
| 293 call dword ptr code | |
| 294 | |
| 295 pop esi | |
| 296 pop edi | |
| 297 } | |
| 298 } | |
| 299 #else | |
| 300 #error Need inline assembly for this compiler | |
| 301 #endif | |
| 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 |