Mercurial > sdl-ios-xcode
annotate src/video/x11/SDL_x11image.c @ 1168:045f186426e1
Dynamically load X11 libraries like we currently do for alsa, esd, etc.
This allows you to run an SDL program on a system without Xlib, since it'll
just report the x11 target unavailable at runtime.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sat, 05 Nov 2005 19:53:37 +0000 |
| parents | 26a0e2d69d39 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 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 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #include <stdlib.h> | |
|
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29 #include <unistd.h> |
| 0 | 30 |
| 31 #include "SDL_error.h" | |
| 32 #include "SDL_endian.h" | |
|
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33 #include "SDL_events_c.h" |
| 0 | 34 #include "SDL_x11image_c.h" |
| 35 | |
| 36 #ifndef NO_SHARED_MEMORY | |
| 37 | |
| 38 /* Shared memory error handler routine */ | |
| 39 static int shm_error; | |
| 40 static int (*X_handler)(Display *, XErrorEvent *) = NULL; | |
| 41 static int shm_errhandler(Display *d, XErrorEvent *e) | |
| 42 { | |
| 43 if ( e->error_code == BadAccess ) { | |
|
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44 shm_error = True; |
| 0 | 45 return(0); |
| 46 } else | |
| 47 return(X_handler(d,e)); | |
| 48 } | |
|
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49 |
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50 static void try_mitshm(_THIS, SDL_Surface *screen) |
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51 { |
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52 if(!use_mitshm) |
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53 return; |
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54 shminfo.shmid = shmget(IPC_PRIVATE, screen->h*screen->pitch, |
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55 IPC_CREAT | 0777); |
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56 if ( shminfo.shmid >= 0 ) { |
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57 shminfo.shmaddr = (char *)shmat(shminfo.shmid, 0, 0); |
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58 shminfo.readOnly = False; |
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59 if ( shminfo.shmaddr != (char *)-1 ) { |
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60 shm_error = False; |
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61 X_handler = pXSetErrorHandler(shm_errhandler); |
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62 pXShmAttach(SDL_Display, &shminfo); |
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63 pXSync(SDL_Display, True); |
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64 pXSetErrorHandler(X_handler); |
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65 if ( shm_error ) |
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66 shmdt(shminfo.shmaddr); |
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67 } else { |
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68 shm_error = True; |
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69 } |
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70 shmctl(shminfo.shmid, IPC_RMID, NULL); |
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71 } else { |
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72 shm_error = True; |
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73 } |
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74 if ( shm_error ) |
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75 use_mitshm = 0; |
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76 if ( use_mitshm ) |
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77 screen->pixels = shminfo.shmaddr; |
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78 } |
| 0 | 79 #endif /* ! NO_SHARED_MEMORY */ |
| 80 | |
| 81 /* Various screen update functions available */ | |
| 82 static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect *rects); | |
| 83 static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect *rects); | |
| 84 | |
| 85 int X11_SetupImage(_THIS, SDL_Surface *screen) | |
| 86 { | |
|
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87 #ifndef NO_SHARED_MEMORY |
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88 try_mitshm(this, screen); |
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89 if(use_mitshm) { |
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90 SDL_Ximage = pXShmCreateImage(SDL_Display, SDL_Visual, |
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91 this->hidden->depth, ZPixmap, |
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92 shminfo.shmaddr, &shminfo, |
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93 screen->w, screen->h); |
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94 if(!SDL_Ximage) { |
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95 pXShmDetach(SDL_Display, &shminfo); |
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96 pXSync(SDL_Display, False); |
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97 shmdt(shminfo.shmaddr); |
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98 screen->pixels = NULL; |
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99 goto error; |
| 0 | 100 } |
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101 this->UpdateRects = X11_MITSHMUpdate; |
| 0 | 102 } |
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103 if(!use_mitshm) |
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104 #endif /* not NO_SHARED_MEMORY */ |
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105 { |
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106 int bpp; |
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107 screen->pixels = malloc(screen->h*screen->pitch); |
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108 if ( screen->pixels == NULL ) { |
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109 SDL_OutOfMemory(); |
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110 return -1; |
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111 } |
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112 bpp = screen->format->BytesPerPixel; |
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113 SDL_Ximage = pXCreateImage(SDL_Display, SDL_Visual, |
| 0 | 114 this->hidden->depth, ZPixmap, 0, |
| 115 (char *)screen->pixels, | |
| 116 screen->w, screen->h, | |
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117 32, 0); |
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118 if ( SDL_Ximage == NULL ) |
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119 goto error; |
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120 /* XPutImage will convert byte sex automatically */ |
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121 SDL_Ximage->byte_order = (SDL_BYTEORDER == SDL_BIG_ENDIAN) |
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122 ? MSBFirst : LSBFirst; |
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123 this->UpdateRects = X11_NormalUpdate; |
| 0 | 124 } |
| 125 screen->pitch = SDL_Ximage->bytes_per_line; | |
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126 return(0); |
| 0 | 127 |
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128 error: |
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129 SDL_SetError("Couldn't create XImage"); |
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130 return 1; |
| 0 | 131 } |
| 132 | |
| 133 void X11_DestroyImage(_THIS, SDL_Surface *screen) | |
| 134 { | |
| 135 if ( SDL_Ximage ) { | |
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136 pXDestroyImage(SDL_Ximage); |
| 0 | 137 #ifndef NO_SHARED_MEMORY |
| 138 if ( use_mitshm ) { | |
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139 pXShmDetach(SDL_Display, &shminfo); |
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140 pXSync(SDL_Display, False); |
| 0 | 141 shmdt(shminfo.shmaddr); |
| 142 } | |
| 143 #endif /* ! NO_SHARED_MEMORY */ | |
| 144 SDL_Ximage = NULL; | |
| 145 } | |
| 146 if ( screen ) { | |
| 147 screen->pixels = NULL; | |
| 148 } | |
| 149 } | |
| 150 | |
|
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151 /* Determine the number of CPUs in the system */ |
| 0 | 152 static int num_CPU(void) |
| 153 { | |
| 154 static int num_cpus = 0; | |
| 155 | |
| 156 if(!num_cpus) { | |
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157 #if defined(__linux) |
| 0 | 158 char line[BUFSIZ]; |
| 159 FILE *pstat = fopen("/proc/stat", "r"); | |
| 160 if ( pstat ) { | |
| 161 while ( fgets(line, sizeof(line), pstat) ) { | |
| 162 if (memcmp(line, "cpu", 3) == 0 && line[3] != ' ') { | |
| 163 ++num_cpus; | |
| 164 } | |
| 165 } | |
| 166 fclose(pstat); | |
| 167 } | |
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168 #elif defined(__sgi) |
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169 num_cpus = sysconf(_SC_NPROC_ONLN); |
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170 #elif defined(_SC_NPROCESSORS_ONLN) |
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171 /* number of processors online (SVR4.0MP compliant machines) */ |
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172 num_cpus = sysconf(_SC_NPROCESSORS_ONLN); |
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173 #elif defined(_SC_NPROCESSORS_CONF) |
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174 /* number of processors configured (SVR4.0MP compliant machines) */ |
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175 num_cpus = sysconf(_SC_NPROCESSORS_CONF); |
| 0 | 176 #endif |
| 177 if ( num_cpus <= 0 ) { | |
| 178 num_cpus = 1; | |
| 179 } | |
| 180 } | |
| 181 return num_cpus; | |
| 182 } | |
| 183 | |
| 184 int X11_ResizeImage(_THIS, SDL_Surface *screen, Uint32 flags) | |
| 185 { | |
| 186 int retval; | |
| 187 | |
| 188 X11_DestroyImage(this, screen); | |
| 189 if ( flags & SDL_OPENGL ) { /* No image when using GL */ | |
| 190 retval = 0; | |
| 191 } else { | |
| 192 retval = X11_SetupImage(this, screen); | |
| 193 /* We support asynchronous blitting on the display */ | |
| 194 if ( flags & SDL_ASYNCBLIT ) { | |
| 195 /* This is actually slower on single-CPU systems, | |
| 196 probably because of CPU contention between the | |
| 197 X server and the application. | |
| 198 Note: Is this still true with XFree86 4.0? | |
| 199 */ | |
| 200 if ( num_CPU() > 1 ) { | |
| 201 screen->flags |= SDL_ASYNCBLIT; | |
| 202 } | |
| 203 } | |
| 204 } | |
| 205 return(retval); | |
| 206 } | |
| 207 | |
| 208 /* We don't actually allow hardware surfaces other than the main one */ | |
| 209 int X11_AllocHWSurface(_THIS, SDL_Surface *surface) | |
| 210 { | |
| 211 return(-1); | |
| 212 } | |
| 213 void X11_FreeHWSurface(_THIS, SDL_Surface *surface) | |
| 214 { | |
| 215 return; | |
| 216 } | |
| 217 | |
| 218 int X11_LockHWSurface(_THIS, SDL_Surface *surface) | |
| 219 { | |
| 220 if ( (surface == SDL_VideoSurface) && blit_queued ) { | |
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221 pXSync(GFX_Display, False); |
| 0 | 222 blit_queued = 0; |
| 223 } | |
| 224 return(0); | |
| 225 } | |
| 226 void X11_UnlockHWSurface(_THIS, SDL_Surface *surface) | |
| 227 { | |
| 228 return; | |
| 229 } | |
| 230 | |
| 231 int X11_FlipHWSurface(_THIS, SDL_Surface *surface) | |
| 232 { | |
| 233 return(0); | |
| 234 } | |
| 235 | |
| 236 static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect *rects) | |
| 237 { | |
| 238 int i; | |
|
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239 |
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240 for (i = 0; i < numrects; ++i) { |
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241 if ( rects[i].w == 0 || rects[i].h == 0 ) { /* Clipped? */ |
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242 continue; |
| 0 | 243 } |
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244 pXPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage, |
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245 rects[i].x, rects[i].y, |
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246 rects[i].x, rects[i].y, rects[i].w, rects[i].h); |
| 0 | 247 } |
| 248 if ( SDL_VideoSurface->flags & SDL_ASYNCBLIT ) { | |
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249 pXFlush(GFX_Display); |
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250 blit_queued = 1; |
| 0 | 251 } else { |
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252 pXSync(GFX_Display, False); |
| 0 | 253 } |
| 254 } | |
| 255 | |
| 256 static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect *rects) | |
| 257 { | |
| 258 #ifndef NO_SHARED_MEMORY | |
| 259 int i; | |
| 260 | |
| 261 for ( i=0; i<numrects; ++i ) { | |
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262 if ( rects[i].w == 0 || rects[i].h == 0 ) { /* Clipped? */ |
| 0 | 263 continue; |
| 264 } | |
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265 pXShmPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage, |
| 0 | 266 rects[i].x, rects[i].y, |
| 267 rects[i].x, rects[i].y, rects[i].w, rects[i].h, | |
| 268 False); | |
| 269 } | |
| 270 if ( SDL_VideoSurface->flags & SDL_ASYNCBLIT ) { | |
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271 pXFlush(GFX_Display); |
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272 blit_queued = 1; |
| 0 | 273 } else { |
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274 pXSync(GFX_Display, False); |
| 0 | 275 } |
| 276 #endif /* ! NO_SHARED_MEMORY */ | |
| 277 } | |
| 278 | |
| 279 /* There's a problem with the automatic refreshing of the display. | |
| 280 Even though the XVideo code uses the GFX_Display to update the | |
| 281 video memory, it appears that updating the window asynchronously | |
| 282 from a different thread will cause "blackouts" of the window. | |
| 283 This is a sort of a hacked workaround for the problem. | |
| 284 */ | |
| 285 static int enable_autorefresh = 1; | |
| 286 | |
| 287 void X11_DisableAutoRefresh(_THIS) | |
| 288 { | |
| 289 --enable_autorefresh; | |
| 290 } | |
| 291 | |
| 292 void X11_EnableAutoRefresh(_THIS) | |
| 293 { | |
| 294 ++enable_autorefresh; | |
| 295 } | |
| 296 | |
| 297 void X11_RefreshDisplay(_THIS) | |
| 298 { | |
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299 /* Don't refresh a display that doesn't have an image (like GL) |
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300 Instead, post an expose event so the application can refresh. |
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301 */ |
| 0 | 302 if ( ! SDL_Ximage || (enable_autorefresh <= 0) ) { |
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303 SDL_PrivateExpose(); |
| 0 | 304 return; |
| 305 } | |
| 306 #ifndef NO_SHARED_MEMORY | |
| 307 if ( this->UpdateRects == X11_MITSHMUpdate ) { | |
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308 pXShmPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage, |
| 0 | 309 0, 0, 0, 0, this->screen->w, this->screen->h, |
| 310 False); | |
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311 } else |
| 0 | 312 #endif /* ! NO_SHARED_MEMORY */ |
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313 { |
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314 pXPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage, |
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315 0, 0, 0, 0, this->screen->w, this->screen->h); |
| 0 | 316 } |
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317 pXSync(SDL_Display, False); |
| 0 | 318 } |