1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2006 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 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 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19 Sam Lantinga
20 slouken@libsdl.org
21 */
22 #include "SDL_config.h"
23
24 #include "SDL_video.h"
25 #include "SDL_sysvideo.h"
26 #include "SDL_blit.h"
27 #include "SDL_RLEaccel_c.h"
28 #include "SDL_pixels_c.h"
29
30 #if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) && SDL_ASSEMBLY_ROUTINES
31 #define MMX_ASMBLIT
32 #if (__GNUC__ > 2) /* SSE instructions aren't in GCC 2. */
33 #define SSE_ASMBLIT
34 #endif
35 #endif
36
37 #if defined(MMX_ASMBLIT)
38 #include "SDL_cpuinfo.h"
39 #include "mmx.h"
40 #endif
41
42 /* The general purpose software blit routine */
SDL_SoftBlit(SDL_Surface * src,SDL_Rect * srcrect,SDL_Surface * dst,SDL_Rect * dstrect)43 static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect,
44 SDL_Surface *dst, SDL_Rect *dstrect)
45 {
46 int okay;
47 int src_locked;
48 int dst_locked;
49
50 /* Everything is okay at the beginning... */
51 okay = 1;
52
53 /* Lock the destination if it's in hardware */
54 dst_locked = 0;
55 if ( SDL_MUSTLOCK(dst) ) {
56 if ( SDL_LockSurface(dst) < 0 ) {
57 okay = 0;
58 } else {
59 dst_locked = 1;
60 }
61 }
62 /* Lock the source if it's in hardware */
63 src_locked = 0;
64 if ( SDL_MUSTLOCK(src) ) {
65 if ( SDL_LockSurface(src) < 0 ) {
66 okay = 0;
67 } else {
68 src_locked = 1;
69 }
70 }
71
72 /* Set up source and destination buffer pointers, and BLIT! */
73 if ( okay && srcrect->w && srcrect->h ) {
74 SDL_BlitInfo info;
75 SDL_loblit RunBlit;
76
77 /* Set up the blit information */
78 info.s_pixels = (Uint8 *)src->pixels +
79 (Uint16)srcrect->y*src->pitch +
80 (Uint16)srcrect->x*src->format->BytesPerPixel;
81 info.s_width = srcrect->w;
82 info.s_height = srcrect->h;
83 info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel;
84 info.d_pixels = (Uint8 *)dst->pixels +
85 (Uint16)dstrect->y*dst->pitch +
86 (Uint16)dstrect->x*dst->format->BytesPerPixel;
87 info.d_width = dstrect->w;
88 info.d_height = dstrect->h;
89 info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel;
90 info.aux_data = src->map->sw_data->aux_data;
91 info.src = src->format;
92 info.table = src->map->table;
93 info.dst = dst->format;
94 RunBlit = src->map->sw_data->blit;
95
96 /* Run the actual software blit */
97 RunBlit(&info);
98 }
99
100 /* We need to unlock the surfaces if they're locked */
101 if ( dst_locked ) {
102 SDL_UnlockSurface(dst);
103 }
104 if ( src_locked ) {
105 SDL_UnlockSurface(src);
106 }
107 /* Blit is done! */
108 return(okay ? 0 : -1);
109 }
110
111 #ifdef MMX_ASMBLIT
SDL_memcpyMMX(Uint8 * to,const Uint8 * from,int len)112 static __inline__ void SDL_memcpyMMX(Uint8 *to, const Uint8 *from, int len)
113 {
114 int i;
115
116 for(i=0; i<len/8; i++) {
117 __asm__ __volatile__ (
118 " movq (%0), %%mm0\n"
119 " movq %%mm0, (%1)\n"
120 : : "r" (from), "r" (to) : "memory");
121 from+=8;
122 to+=8;
123 }
124 if (len&7)
125 SDL_memcpy(to, from, len&7);
126 }
127
128 #ifdef SSE_ASMBLIT
SDL_memcpySSE(Uint8 * to,const Uint8 * from,int len)129 static __inline__ void SDL_memcpySSE(Uint8 *to, const Uint8 *from, int len)
130 {
131 int i;
132
133 __asm__ __volatile__ (
134 " prefetchnta (%0)\n"
135 " prefetchnta 64(%0)\n"
136 " prefetchnta 128(%0)\n"
137 " prefetchnta 192(%0)\n"
138 : : "r" (from) );
139
140 for(i=0; i<len/8; i++) {
141 __asm__ __volatile__ (
142 " prefetchnta 256(%0)\n"
143 " movq (%0), %%mm0\n"
144 " movntq %%mm0, (%1)\n"
145 : : "r" (from), "r" (to) : "memory");
146 from+=8;
147 to+=8;
148 }
149 if (len&7)
150 SDL_memcpy(to, from, len&7);
151 }
152 #endif
153 #endif
154
SDL_BlitCopy(SDL_BlitInfo * info)155 static void SDL_BlitCopy(SDL_BlitInfo *info)
156 {
157 Uint8 *src, *dst;
158 int w, h;
159 int srcskip, dstskip;
160
161 w = info->d_width*info->dst->BytesPerPixel;
162 h = info->d_height;
163 src = info->s_pixels;
164 dst = info->d_pixels;
165 srcskip = w+info->s_skip;
166 dstskip = w+info->d_skip;
167
168 #ifdef SSE_ASMBLIT
169 if(SDL_HasSSE())
170 {
171 while ( h-- ) {
172 SDL_memcpySSE(dst, src, w);
173 src += srcskip;
174 dst += dstskip;
175 }
176 __asm__ __volatile__ (
177 " emms\n"
178 ::);
179 }
180 else
181 #endif
182 #ifdef MMX_ASMBLIT
183 if(SDL_HasMMX())
184 {
185 while ( h-- ) {
186 SDL_memcpyMMX(dst, src, w);
187 src += srcskip;
188 dst += dstskip;
189 }
190 __asm__ __volatile__ (
191 " emms\n"
192 ::);
193 }
194 else
195 #endif
196 while ( h-- ) {
197 SDL_memcpy(dst, src, w);
198 src += srcskip;
199 dst += dstskip;
200 }
201 }
202
SDL_BlitCopyOverlap(SDL_BlitInfo * info)203 static void SDL_BlitCopyOverlap(SDL_BlitInfo *info)
204 {
205 Uint8 *src, *dst;
206 int w, h;
207 int srcskip, dstskip;
208
209 w = info->d_width*info->dst->BytesPerPixel;
210 h = info->d_height;
211 src = info->s_pixels;
212 dst = info->d_pixels;
213 srcskip = w+info->s_skip;
214 dstskip = w+info->d_skip;
215 if ( dst < src ) {
216 while ( h-- ) {
217 SDL_memcpy(dst, src, w);
218 src += srcskip;
219 dst += dstskip;
220 }
221 } else {
222 src += ((h-1) * srcskip);
223 dst += ((h-1) * dstskip);
224 while ( h-- ) {
225 SDL_revcpy(dst, src, w);
226 src -= srcskip;
227 dst -= dstskip;
228 }
229 }
230 }
231
232 /* Figure out which of many blit routines to set up on a surface */
SDL_CalculateBlit(SDL_Surface * surface)233 int SDL_CalculateBlit(SDL_Surface *surface)
234 {
235 int blit_index;
236
237 /* Clean everything out to start */
238 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
239 SDL_UnRLESurface(surface, 1);
240 }
241 surface->map->sw_blit = NULL;
242
243 /* Figure out if an accelerated hardware blit is possible */
244 surface->flags &= ~SDL_HWACCEL;
245 if ( surface->map->identity ) {
246 int hw_blit_ok;
247
248 if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
249 /* We only support accelerated blitting to hardware */
250 if ( surface->map->dst->flags & SDL_HWSURFACE ) {
251 hw_blit_ok = current_video->info.blit_hw;
252 } else {
253 hw_blit_ok = 0;
254 }
255 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
256 hw_blit_ok = current_video->info.blit_hw_CC;
257 }
258 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
259 hw_blit_ok = current_video->info.blit_hw_A;
260 }
261 } else {
262 /* We only support accelerated blitting to hardware */
263 if ( surface->map->dst->flags & SDL_HWSURFACE ) {
264 hw_blit_ok = current_video->info.blit_sw;
265 } else {
266 hw_blit_ok = 0;
267 }
268 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
269 hw_blit_ok = current_video->info.blit_sw_CC;
270 }
271 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
272 hw_blit_ok = current_video->info.blit_sw_A;
273 }
274 }
275 if ( hw_blit_ok ) {
276 SDL_VideoDevice *video = current_video;
277 SDL_VideoDevice *this = current_video;
278 video->CheckHWBlit(this, surface, surface->map->dst);
279 }
280 }
281
282 /* if an alpha pixel format is specified, we can accelerate alpha blits */
283 if (((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE )&&(current_video->displayformatalphapixel))
284 {
285 if ( (surface->flags & SDL_SRCALPHA) )
286 if ( current_video->info.blit_hw_A ) {
287 SDL_VideoDevice *video = current_video;
288 SDL_VideoDevice *this = current_video;
289 video->CheckHWBlit(this, surface, surface->map->dst);
290 }
291 }
292
293 /* Get the blit function index, based on surface mode */
294 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */
295 blit_index = 0;
296 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0;
297 if ( surface->flags & SDL_SRCALPHA
298 && (surface->format->alpha != SDL_ALPHA_OPAQUE
299 || surface->format->Amask) ) {
300 blit_index |= 2;
301 }
302
303 /* Check for special "identity" case -- copy blit */
304 if ( surface->map->identity && blit_index == 0 ) {
305 surface->map->sw_data->blit = SDL_BlitCopy;
306
307 /* Handle overlapping blits on the same surface */
308 if ( surface == surface->map->dst ) {
309 surface->map->sw_data->blit = SDL_BlitCopyOverlap;
310 }
311 } else {
312 if ( surface->format->BitsPerPixel < 8 ) {
313 surface->map->sw_data->blit =
314 SDL_CalculateBlit0(surface, blit_index);
315 } else {
316 switch ( surface->format->BytesPerPixel ) {
317 case 1:
318 surface->map->sw_data->blit =
319 SDL_CalculateBlit1(surface, blit_index);
320 break;
321 case 2:
322 case 3:
323 case 4:
324 surface->map->sw_data->blit =
325 SDL_CalculateBlitN(surface, blit_index);
326 break;
327 default:
328 surface->map->sw_data->blit = NULL;
329 break;
330 }
331 }
332 }
333 /* Make sure we have a blit function */
334 if ( surface->map->sw_data->blit == NULL ) {
335 SDL_InvalidateMap(surface->map);
336 SDL_SetError("Blit combination not supported");
337 return(-1);
338 }
339
340 /* Choose software blitting function */
341 if(surface->flags & SDL_RLEACCELOK
342 && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) {
343
344 if(surface->map->identity
345 && (blit_index == 1
346 || (blit_index == 3 && !surface->format->Amask))) {
347 if ( SDL_RLESurface(surface) == 0 )
348 surface->map->sw_blit = SDL_RLEBlit;
349 } else if(blit_index == 2 && surface->format->Amask) {
350 if ( SDL_RLESurface(surface) == 0 )
351 surface->map->sw_blit = SDL_RLEAlphaBlit;
352 }
353 }
354
355 if ( surface->map->sw_blit == NULL ) {
356 surface->map->sw_blit = SDL_SoftBlit;
357 }
358 return(0);
359 }
360
361