Mercurial > sdl-ios-xcode
annotate src/video/SDL_stretch.c @ 1505:4d005dfbb7f5
Fixed bug #139
The text in SDL_WM_SetCaption() is in UTF-8 encoding.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 13 Mar 2006 01:33:58 +0000 |
parents | e3242177fe4a |
children | 782fd950bd46 b5a4ac87b98c |
rev | line source |
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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 |