Mercurial > sdl-ios-xcode
annotate src/video/SDL_stretch.c @ 4135:cd98d1dc385c SDL-1.2
Damien Carbery fixed bug #542
In SDL 1.2.13 sdl.m4 the AM_PATH_SDL function looks for sdl-config.
It sets the PATH:
PATH="$prefix/bin:$prefix/usr/bin:$PATH"
but does not save the current PATH or restore the current PATH at the end.
This breaks the build on Solaris because we have GNU tools in another dir
(listed at the top of PATH) but non-GNU tools with the same names in
$prefix/bin. Later configure tests finds the non-GNU tools and quits in error
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 24 Jan 2008 15:50:20 +0000 |
| parents | cd2ab40f1219 |
| children | a1b03ba2fcd0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information and removed rcs id lines (problematic in branch merges)
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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 |
|
c9b51268668f
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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 #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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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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4109
cd2ab40f1219
Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
Sam Lantinga <slouken@libsdl.org>
parents:
4108
diff
changeset
|
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:
4108
diff
changeset
|
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
|
297 __asm__ __volatile__ ( |
|
1228
f4a3a4129d04
From Mike Frysinger and/or Gentoo:
Ryan C. Gordon <icculus@icculus.org>
parents:
1164
diff
changeset
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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:
1233
diff
changeset
|
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
73676c1f56ee
For sanity's sake, removed the '&' when passing copy_row array to asm.
Ryan C. Gordon <icculus@icculus.org>
parents:
1233
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 | |
|
4109
cd2ab40f1219
Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
Sam Lantinga <slouken@libsdl.org>
parents:
4108
diff
changeset
|
319 } else |
|
cd2ab40f1219
Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
Sam Lantinga <slouken@libsdl.org>
parents:
4108
diff
changeset
|
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
|
339 |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
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
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
341 if ( dst_locked ) { |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
342 SDL_UnlockSurface(dst); |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
343 } |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
344 if ( src_locked ) { |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
345 SDL_UnlockSurface(src); |
|
1d1a823904d8
Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
346 } |
| 0 | 347 return(0); |
| 348 } | |
| 349 |