Mercurial > sdl-ios-xcode
annotate src/video/x11/SDL_x11image.c @ 4333:55717a755897 SDL-1.2
Switched from setting the period size and count to setting the buffer size directly, based on feedback from the ALSA development list:
http://mailman.alsa-project.org/pipermail/alsa-devel/2009-October/022267.html
This has the nice side effect of reducing latency on my SBLive! card.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 13 Oct 2009 09:56:15 +0000 |
| parents | a1b03ba2fcd0 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 4159 | 3 Copyright (C) 1997-2009 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 |
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24 #include <stdio.h> |
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25 #include <unistd.h> |
| 0 | 26 |
| 27 #include "SDL_endian.h" | |
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28 #include "../../events/SDL_events_c.h" |
| 0 | 29 #include "SDL_x11image_c.h" |
| 30 | |
| 31 #ifndef NO_SHARED_MEMORY | |
| 32 | |
| 33 /* Shared memory error handler routine */ | |
| 34 static int shm_error; | |
| 35 static int (*X_handler)(Display *, XErrorEvent *) = NULL; | |
| 36 static int shm_errhandler(Display *d, XErrorEvent *e) | |
| 37 { | |
| 38 if ( e->error_code == BadAccess ) { | |
|
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39 shm_error = True; |
| 0 | 40 return(0); |
| 41 } else | |
| 42 return(X_handler(d,e)); | |
| 43 } | |
|
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44 |
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45 static void try_mitshm(_THIS, SDL_Surface *screen) |
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46 { |
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47 /* Dynamic X11 may not have SHM entry points on this box. */ |
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48 if ((use_mitshm) && (!SDL_X11_HAVE_SHM)) |
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49 use_mitshm = 0; |
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50 |
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51 if(!use_mitshm) |
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52 return; |
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53 shminfo.shmid = shmget(IPC_PRIVATE, screen->h*screen->pitch, |
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54 IPC_CREAT | 0777); |
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55 if ( shminfo.shmid >= 0 ) { |
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56 shminfo.shmaddr = (char *)shmat(shminfo.shmid, 0, 0); |
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57 shminfo.readOnly = False; |
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58 if ( shminfo.shmaddr != (char *)-1 ) { |
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59 shm_error = False; |
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60 X_handler = XSetErrorHandler(shm_errhandler); |
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61 XShmAttach(SDL_Display, &shminfo); |
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62 XSync(SDL_Display, True); |
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63 XSetErrorHandler(X_handler); |
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64 if ( shm_error ) |
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65 shmdt(shminfo.shmaddr); |
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66 } else { |
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67 shm_error = True; |
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68 } |
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69 shmctl(shminfo.shmid, IPC_RMID, NULL); |
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70 } else { |
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71 shm_error = True; |
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72 } |
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73 if ( shm_error ) |
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74 use_mitshm = 0; |
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75 if ( use_mitshm ) |
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76 screen->pixels = shminfo.shmaddr; |
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77 } |
| 0 | 78 #endif /* ! NO_SHARED_MEMORY */ |
| 79 | |
| 80 /* Various screen update functions available */ | |
| 81 static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect *rects); | |
| 82 static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect *rects); | |
| 83 | |
| 84 int X11_SetupImage(_THIS, SDL_Surface *screen) | |
| 85 { | |
|
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86 #ifndef NO_SHARED_MEMORY |
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87 try_mitshm(this, screen); |
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88 if(use_mitshm) { |
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parents:
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89 SDL_Ximage = XShmCreateImage(SDL_Display, SDL_Visual, |
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90 this->hidden->depth, ZPixmap, |
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91 shminfo.shmaddr, &shminfo, |
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92 screen->w, screen->h); |
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93 if(!SDL_Ximage) { |
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94 XShmDetach(SDL_Display, &shminfo); |
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95 XSync(SDL_Display, False); |
|
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96 shmdt(shminfo.shmaddr); |
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97 screen->pixels = NULL; |
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98 goto error; |
| 0 | 99 } |
|
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100 this->UpdateRects = X11_MITSHMUpdate; |
| 0 | 101 } |
|
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Doh! Compile error if there was no X11 shared image support
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102 if(!use_mitshm) |
|
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103 #endif /* not NO_SHARED_MEMORY */ |
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104 { |
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105 int bpp; |
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106 screen->pixels = SDL_malloc(screen->h*screen->pitch); |
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107 if ( screen->pixels == NULL ) { |
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108 SDL_OutOfMemory(); |
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109 return -1; |
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110 } |
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111 bpp = screen->format->BytesPerPixel; |
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112 SDL_Ximage = XCreateImage(SDL_Display, SDL_Visual, |
| 0 | 113 this->hidden->depth, ZPixmap, 0, |
| 114 (char *)screen->pixels, | |
| 115 screen->w, screen->h, | |
|
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116 32, 0); |
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117 if ( SDL_Ximage == NULL ) |
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118 goto error; |
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119 /* XPutImage will convert byte sex automatically */ |
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120 SDL_Ximage->byte_order = (SDL_BYTEORDER == SDL_BIG_ENDIAN) |
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121 ? MSBFirst : LSBFirst; |
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122 this->UpdateRects = X11_NormalUpdate; |
| 0 | 123 } |
| 124 screen->pitch = SDL_Ximage->bytes_per_line; | |
|
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125 return(0); |
| 0 | 126 |
|
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127 error: |
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128 SDL_SetError("Couldn't create XImage"); |
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129 return 1; |
| 0 | 130 } |
| 131 | |
| 132 void X11_DestroyImage(_THIS, SDL_Surface *screen) | |
| 133 { | |
| 134 if ( SDL_Ximage ) { | |
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135 XDestroyImage(SDL_Ximage); |
| 0 | 136 #ifndef NO_SHARED_MEMORY |
| 137 if ( use_mitshm ) { | |
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parents:
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138 XShmDetach(SDL_Display, &shminfo); |
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parents:
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139 XSync(SDL_Display, False); |
| 0 | 140 shmdt(shminfo.shmaddr); |
| 141 } | |
| 142 #endif /* ! NO_SHARED_MEMORY */ | |
| 143 SDL_Ximage = NULL; | |
| 144 } | |
| 145 if ( screen ) { | |
| 146 screen->pixels = NULL; | |
| 147 } | |
| 148 } | |
| 149 | |
|
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Fixed Solaris nitpicks (thanks Mattias!)
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150 /* Determine the number of CPUs in the system */ |
| 0 | 151 static int num_CPU(void) |
| 152 { | |
| 153 static int num_cpus = 0; | |
| 154 | |
| 155 if(!num_cpus) { | |
|
1402
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156 #if defined(__LINUX__) |
| 0 | 157 char line[BUFSIZ]; |
| 158 FILE *pstat = fopen("/proc/stat", "r"); | |
| 159 if ( pstat ) { | |
| 160 while ( fgets(line, sizeof(line), pstat) ) { | |
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161 if (SDL_memcmp(line, "cpu", 3) == 0 && line[3] != ' ') { |
| 0 | 162 ++num_cpus; |
| 163 } | |
| 164 } | |
| 165 fclose(pstat); | |
| 166 } | |
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167 #elif defined(__IRIX__) |
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168 num_cpus = sysconf(_SC_NPROC_ONLN); |
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169 #elif defined(_SC_NPROCESSORS_ONLN) |
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170 /* number of processors online (SVR4.0MP compliant machines) */ |
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171 num_cpus = sysconf(_SC_NPROCESSORS_ONLN); |
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172 #elif defined(_SC_NPROCESSORS_CONF) |
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173 /* number of processors configured (SVR4.0MP compliant machines) */ |
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174 num_cpus = sysconf(_SC_NPROCESSORS_CONF); |
| 0 | 175 #endif |
| 176 if ( num_cpus <= 0 ) { | |
| 177 num_cpus = 1; | |
| 178 } | |
| 179 } | |
| 180 return num_cpus; | |
| 181 } | |
| 182 | |
| 183 int X11_ResizeImage(_THIS, SDL_Surface *screen, Uint32 flags) | |
| 184 { | |
| 185 int retval; | |
| 186 | |
| 187 X11_DestroyImage(this, screen); | |
| 188 if ( flags & SDL_OPENGL ) { /* No image when using GL */ | |
| 189 retval = 0; | |
| 190 } else { | |
| 191 retval = X11_SetupImage(this, screen); | |
| 192 /* We support asynchronous blitting on the display */ | |
| 193 if ( flags & SDL_ASYNCBLIT ) { | |
| 194 /* This is actually slower on single-CPU systems, | |
| 195 probably because of CPU contention between the | |
| 196 X server and the application. | |
| 197 Note: Is this still true with XFree86 4.0? | |
| 198 */ | |
| 199 if ( num_CPU() > 1 ) { | |
| 200 screen->flags |= SDL_ASYNCBLIT; | |
| 201 } | |
| 202 } | |
| 203 } | |
| 204 return(retval); | |
| 205 } | |
| 206 | |
| 207 /* We don't actually allow hardware surfaces other than the main one */ | |
| 208 int X11_AllocHWSurface(_THIS, SDL_Surface *surface) | |
| 209 { | |
| 210 return(-1); | |
| 211 } | |
| 212 void X11_FreeHWSurface(_THIS, SDL_Surface *surface) | |
| 213 { | |
| 214 return; | |
| 215 } | |
| 216 | |
| 217 int X11_LockHWSurface(_THIS, SDL_Surface *surface) | |
| 218 { | |
| 219 if ( (surface == SDL_VideoSurface) && blit_queued ) { | |
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220 XSync(GFX_Display, False); |
| 0 | 221 blit_queued = 0; |
| 222 } | |
| 223 return(0); | |
| 224 } | |
| 225 void X11_UnlockHWSurface(_THIS, SDL_Surface *surface) | |
| 226 { | |
| 227 return; | |
| 228 } | |
| 229 | |
| 230 int X11_FlipHWSurface(_THIS, SDL_Surface *surface) | |
| 231 { | |
| 232 return(0); | |
| 233 } | |
| 234 | |
| 235 static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect *rects) | |
| 236 { | |
| 237 int i; | |
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238 |
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239 for (i = 0; i < numrects; ++i) { |
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240 if ( rects[i].w == 0 || rects[i].h == 0 ) { /* Clipped? */ |
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241 continue; |
| 0 | 242 } |
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243 XPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage, |
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244 rects[i].x, rects[i].y, |
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245 rects[i].x, rects[i].y, rects[i].w, rects[i].h); |
| 0 | 246 } |
| 247 if ( SDL_VideoSurface->flags & SDL_ASYNCBLIT ) { | |
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248 XFlush(GFX_Display); |
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249 blit_queued = 1; |
| 0 | 250 } else { |
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251 XSync(GFX_Display, False); |
| 0 | 252 } |
| 253 } | |
| 254 | |
| 255 static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect *rects) | |
| 256 { | |
| 257 #ifndef NO_SHARED_MEMORY | |
| 258 int i; | |
| 259 | |
| 260 for ( i=0; i<numrects; ++i ) { | |
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261 if ( rects[i].w == 0 || rects[i].h == 0 ) { /* Clipped? */ |
| 0 | 262 continue; |
| 263 } | |
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264 XShmPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage, |
| 0 | 265 rects[i].x, rects[i].y, |
| 266 rects[i].x, rects[i].y, rects[i].w, rects[i].h, | |
| 267 False); | |
| 268 } | |
| 269 if ( SDL_VideoSurface->flags & SDL_ASYNCBLIT ) { | |
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270 XFlush(GFX_Display); |
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271 blit_queued = 1; |
| 0 | 272 } else { |
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273 XSync(GFX_Display, False); |
| 0 | 274 } |
| 275 #endif /* ! NO_SHARED_MEMORY */ | |
| 276 } | |
| 277 | |
| 278 /* There's a problem with the automatic refreshing of the display. | |
| 279 Even though the XVideo code uses the GFX_Display to update the | |
| 280 video memory, it appears that updating the window asynchronously | |
| 281 from a different thread will cause "blackouts" of the window. | |
| 282 This is a sort of a hacked workaround for the problem. | |
| 283 */ | |
| 284 static int enable_autorefresh = 1; | |
| 285 | |
| 286 void X11_DisableAutoRefresh(_THIS) | |
| 287 { | |
| 288 --enable_autorefresh; | |
| 289 } | |
| 290 | |
| 291 void X11_EnableAutoRefresh(_THIS) | |
| 292 { | |
| 293 ++enable_autorefresh; | |
| 294 } | |
| 295 | |
| 296 void X11_RefreshDisplay(_THIS) | |
| 297 { | |
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298 /* Don't refresh a display that doesn't have an image (like GL) |
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299 Instead, post an expose event so the application can refresh. |
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300 */ |
| 0 | 301 if ( ! SDL_Ximage || (enable_autorefresh <= 0) ) { |
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302 SDL_PrivateExpose(); |
| 0 | 303 return; |
| 304 } | |
| 305 #ifndef NO_SHARED_MEMORY | |
| 306 if ( this->UpdateRects == X11_MITSHMUpdate ) { | |
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307 XShmPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage, |
| 0 | 308 0, 0, 0, 0, this->screen->w, this->screen->h, |
| 309 False); | |
|
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310 } else |
| 0 | 311 #endif /* ! NO_SHARED_MEMORY */ |
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312 { |
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313 XPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage, |
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314 0, 0, 0, 0, this->screen->w, this->screen->h); |
| 0 | 315 } |
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316 XSync(SDL_Display, False); |
| 0 | 317 } |
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318 |