Mercurial > sdl-ios-xcode
annotate src/video/x11/SDL_x11image.c @ 551:b0c5a13a4243
Doh! Compile error if there was no X11 shared image support
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 02 Dec 2002 01:47:03 +0000 |
| parents | f6ffac90895c |
| children | 6399f4e90211 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2002
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|
3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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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Updated the source with the correct e-mail address
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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 information */ | |
| 39 extern int XShmQueryExtension(Display *dpy); /* Not in X11 headers */ | |
| 40 | |
| 41 /* Shared memory error handler routine */ | |
| 42 static int shm_error; | |
| 43 static int (*X_handler)(Display *, XErrorEvent *) = NULL; | |
| 44 static int shm_errhandler(Display *d, XErrorEvent *e) | |
| 45 { | |
| 46 if ( e->error_code == BadAccess ) { | |
|
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47 shm_error = 1; |
| 0 | 48 return(0); |
| 49 } else | |
| 50 return(X_handler(d,e)); | |
| 51 } | |
|
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52 |
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53 static void try_mitshm(_THIS, SDL_Surface *screen) |
|
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54 { |
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55 if(!use_mitshm) |
|
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56 return; |
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57 shminfo.shmid = shmget(IPC_PRIVATE, screen->h*screen->pitch, |
|
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58 IPC_CREAT | 0777); |
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59 if ( shminfo.shmid >= 0 ) { |
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60 shminfo.shmaddr = (char *)shmat(shminfo.shmid, 0, 0); |
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61 shminfo.readOnly = False; |
|
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62 if ( shminfo.shmaddr != (char *)-1 ) { |
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63 shm_error = False; |
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64 X_handler = XSetErrorHandler(shm_errhandler); |
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65 XShmAttach(SDL_Display, &shminfo); |
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66 XSync(SDL_Display, True); |
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67 XSetErrorHandler(X_handler); |
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68 if (shm_error) |
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69 shmdt(shminfo.shmaddr); |
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70 } else { |
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71 shm_error = True; |
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72 } |
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73 shmctl(shminfo.shmid, IPC_RMID, NULL); |
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74 } else { |
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75 shm_error = True; |
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76 } |
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77 if ( shm_error ) |
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78 use_mitshm = 0; |
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79 if ( use_mitshm ) |
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80 screen->pixels = shminfo.shmaddr; |
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81 } |
| 0 | 82 #endif /* ! NO_SHARED_MEMORY */ |
| 83 | |
| 84 /* Various screen update functions available */ | |
| 85 static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect *rects); | |
| 86 static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect *rects); | |
| 87 | |
| 88 int X11_SetupImage(_THIS, SDL_Surface *screen) | |
| 89 { | |
|
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90 #ifndef NO_SHARED_MEMORY |
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91 try_mitshm(this, screen); |
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92 if(use_mitshm) { |
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93 SDL_Ximage = XShmCreateImage(SDL_Display, SDL_Visual, |
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94 this->hidden->depth, ZPixmap, |
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95 shminfo.shmaddr, &shminfo, |
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96 screen->w, screen->h); |
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97 if(!SDL_Ximage) { |
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98 XShmDetach(SDL_Display, &shminfo); |
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99 XSync(SDL_Display, False); |
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100 shmdt(shminfo.shmaddr); |
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101 screen->pixels = NULL; |
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102 goto error; |
| 0 | 103 } |
|
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104 this->UpdateRects = X11_MITSHMUpdate; |
| 0 | 105 } |
|
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Doh! Compile error if there was no X11 shared image support
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106 if(!use_mitshm) |
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107 #endif /* not NO_SHARED_MEMORY */ |
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108 { |
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109 int bpp; |
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110 screen->pixels = malloc(screen->h*screen->pitch); |
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111 if ( screen->pixels == NULL ) { |
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112 SDL_OutOfMemory(); |
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113 return -1; |
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114 } |
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115 bpp = screen->format->BytesPerPixel; |
| 0 | 116 SDL_Ximage = XCreateImage(SDL_Display, SDL_Visual, |
| 117 this->hidden->depth, ZPixmap, 0, | |
| 118 (char *)screen->pixels, | |
| 119 screen->w, screen->h, | |
|
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120 32, 0); |
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121 if ( SDL_Ximage == NULL ) |
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122 goto error; |
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123 /* XPutImage will convert byte sex automatically */ |
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124 SDL_Ximage->byte_order = (SDL_BYTEORDER == SDL_BIG_ENDIAN) |
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125 ? MSBFirst : LSBFirst; |
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126 this->UpdateRects = X11_NormalUpdate; |
| 0 | 127 } |
| 128 screen->pitch = SDL_Ximage->bytes_per_line; | |
|
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129 return(0); |
| 0 | 130 |
|
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131 error: |
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132 SDL_SetError("Couldn't create XImage"); |
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133 return 1; |
| 0 | 134 } |
| 135 | |
| 136 void X11_DestroyImage(_THIS, SDL_Surface *screen) | |
| 137 { | |
| 138 if ( SDL_Ximage ) { | |
| 139 XDestroyImage(SDL_Ximage); | |
| 140 #ifndef NO_SHARED_MEMORY | |
| 141 if ( use_mitshm ) { | |
| 142 XShmDetach(SDL_Display, &shminfo); | |
| 143 XSync(SDL_Display, False); | |
| 144 shmdt(shminfo.shmaddr); | |
| 145 } | |
| 146 #endif /* ! NO_SHARED_MEMORY */ | |
| 147 SDL_Ximage = NULL; | |
| 148 } | |
| 149 if ( screen ) { | |
| 150 screen->pixels = NULL; | |
| 151 } | |
| 152 } | |
| 153 | |
|
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154 /* Determine the number of CPUs in the system */ |
| 0 | 155 static int num_CPU(void) |
| 156 { | |
| 157 static int num_cpus = 0; | |
| 158 | |
| 159 if(!num_cpus) { | |
|
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160 #if defined(__linux) |
| 0 | 161 char line[BUFSIZ]; |
| 162 FILE *pstat = fopen("/proc/stat", "r"); | |
| 163 if ( pstat ) { | |
| 164 while ( fgets(line, sizeof(line), pstat) ) { | |
| 165 if (memcmp(line, "cpu", 3) == 0 && line[3] != ' ') { | |
| 166 ++num_cpus; | |
| 167 } | |
| 168 } | |
| 169 fclose(pstat); | |
| 170 } | |
|
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171 #elif defined(_SC_NPROCESSORS_ONLN) |
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172 /* number of processors online (SVR4.0MP compliant machines) */ |
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173 num_cpus = sysconf(_SC_NPROCESSORS_ONLN); |
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174 #elif defined(_SC_NPROCESSORS_CONF) |
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175 /* number of processors configured (SVR4.0MP compliant machines) */ |
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176 num_cpus = sysconf(_SC_NPROCESSORS_CONF); |
| 0 | 177 #endif |
| 178 if ( num_cpus <= 0 ) { | |
| 179 num_cpus = 1; | |
| 180 } | |
| 181 } | |
| 182 return num_cpus; | |
| 183 } | |
| 184 | |
| 185 int X11_ResizeImage(_THIS, SDL_Surface *screen, Uint32 flags) | |
| 186 { | |
| 187 int retval; | |
| 188 | |
| 189 X11_DestroyImage(this, screen); | |
| 190 if ( flags & SDL_OPENGL ) { /* No image when using GL */ | |
| 191 retval = 0; | |
| 192 } else { | |
| 193 retval = X11_SetupImage(this, screen); | |
| 194 /* We support asynchronous blitting on the display */ | |
| 195 if ( flags & SDL_ASYNCBLIT ) { | |
| 196 /* This is actually slower on single-CPU systems, | |
| 197 probably because of CPU contention between the | |
| 198 X server and the application. | |
| 199 Note: Is this still true with XFree86 4.0? | |
| 200 */ | |
| 201 if ( num_CPU() > 1 ) { | |
| 202 screen->flags |= SDL_ASYNCBLIT; | |
| 203 } | |
| 204 } | |
| 205 } | |
| 206 return(retval); | |
| 207 } | |
| 208 | |
| 209 /* We don't actually allow hardware surfaces other than the main one */ | |
| 210 int X11_AllocHWSurface(_THIS, SDL_Surface *surface) | |
| 211 { | |
| 212 return(-1); | |
| 213 } | |
| 214 void X11_FreeHWSurface(_THIS, SDL_Surface *surface) | |
| 215 { | |
| 216 return; | |
| 217 } | |
| 218 | |
| 219 int X11_LockHWSurface(_THIS, SDL_Surface *surface) | |
| 220 { | |
| 221 if ( (surface == SDL_VideoSurface) && blit_queued ) { | |
| 222 XSync(GFX_Display, False); | |
| 223 blit_queued = 0; | |
| 224 } | |
| 225 return(0); | |
| 226 } | |
| 227 void X11_UnlockHWSurface(_THIS, SDL_Surface *surface) | |
| 228 { | |
| 229 return; | |
| 230 } | |
| 231 | |
| 232 int X11_FlipHWSurface(_THIS, SDL_Surface *surface) | |
| 233 { | |
| 234 return(0); | |
| 235 } | |
| 236 | |
| 237 static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect *rects) | |
| 238 { | |
| 239 int i; | |
|
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240 |
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241 for (i = 0; i < numrects; ++i) { |
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242 if ( rects[i].w == 0 || rects[i].h == 0 ) { /* Clipped? */ |
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243 continue; |
| 0 | 244 } |
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245 XPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage, |
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246 rects[i].x, rects[i].y, |
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247 rects[i].x, rects[i].y, rects[i].w, rects[i].h); |
| 0 | 248 } |
| 249 if ( SDL_VideoSurface->flags & SDL_ASYNCBLIT ) { | |
| 250 XFlush(GFX_Display); | |
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251 blit_queued = 1; |
| 0 | 252 } else { |
| 253 XSync(GFX_Display, False); | |
| 254 } | |
| 255 } | |
| 256 | |
| 257 static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect *rects) | |
| 258 { | |
| 259 #ifndef NO_SHARED_MEMORY | |
| 260 int i; | |
| 261 | |
| 262 for ( i=0; i<numrects; ++i ) { | |
|
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263 if ( rects[i].w == 0 || rects[i].h == 0 ) { /* Clipped? */ |
| 0 | 264 continue; |
| 265 } | |
| 266 XShmPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage, | |
| 267 rects[i].x, rects[i].y, | |
| 268 rects[i].x, rects[i].y, rects[i].w, rects[i].h, | |
| 269 False); | |
| 270 } | |
| 271 if ( SDL_VideoSurface->flags & SDL_ASYNCBLIT ) { | |
| 272 XFlush(GFX_Display); | |
|
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273 blit_queued = 1; |
| 0 | 274 } else { |
| 275 XSync(GFX_Display, False); | |
| 276 } | |
| 277 #endif /* ! NO_SHARED_MEMORY */ | |
| 278 } | |
| 279 | |
| 280 /* There's a problem with the automatic refreshing of the display. | |
| 281 Even though the XVideo code uses the GFX_Display to update the | |
| 282 video memory, it appears that updating the window asynchronously | |
| 283 from a different thread will cause "blackouts" of the window. | |
| 284 This is a sort of a hacked workaround for the problem. | |
| 285 */ | |
| 286 static int enable_autorefresh = 1; | |
| 287 | |
| 288 void X11_DisableAutoRefresh(_THIS) | |
| 289 { | |
| 290 --enable_autorefresh; | |
| 291 } | |
| 292 | |
| 293 void X11_EnableAutoRefresh(_THIS) | |
| 294 { | |
| 295 ++enable_autorefresh; | |
| 296 } | |
| 297 | |
| 298 void X11_RefreshDisplay(_THIS) | |
| 299 { | |
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300 /* Don't refresh a display that doesn't have an image (like GL) |
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301 Instead, post an expose event so the application can refresh. |
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302 */ |
| 0 | 303 if ( ! SDL_Ximage || (enable_autorefresh <= 0) ) { |
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304 SDL_PrivateExpose(); |
| 0 | 305 return; |
| 306 } | |
| 307 #ifndef NO_SHARED_MEMORY | |
| 308 if ( this->UpdateRects == X11_MITSHMUpdate ) { | |
| 309 XShmPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage, | |
| 310 0, 0, 0, 0, this->screen->w, this->screen->h, | |
| 311 False); | |
|
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312 } else |
| 0 | 313 #endif /* ! NO_SHARED_MEMORY */ |
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314 { |
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315 XPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage, |
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316 0, 0, 0, 0, this->screen->w, this->screen->h); |
| 0 | 317 } |
| 318 XSync(SDL_Display, False); | |
| 319 } |