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| /* | ||
| SDL - Simple DirectMedia Layer | ||
| Copyright (C) 1997-2009 Sam Lantinga | ||
| This library is free software; you can redistribute it and/or | ||
| modify it under the terms of the GNU Lesser General Public | ||
| License as published by the Free Software Foundation; either | ||
| version 2.1 of the License, or (at your option) any later version. | ||
| This library is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| Lesser General Public License for more details. | ||
| You should have received a copy of the GNU Lesser General Public | ||
| License along with this library; if not, write to the Free Software | ||
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | ||
| Sam Lantinga | ||
| slouken@libsdl.org | ||
| */ | ||
| #include "SDL_config.h" | ||
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| #include "SDL_x11video.h" | ||
| #include "SDL_x11framebuffer.h" | ||
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| #ifndef NO_SHARED_MEMORY | ||
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| /* Shared memory error handler routine */ | ||
| static int shm_error; | ||
| static int (*X_handler)(Display *, XErrorEvent *) = NULL; | ||
| static int shm_errhandler(Display *d, XErrorEvent *e) | ||
| { | ||
| if ( e->error_code == BadAccess ) { | ||
| shm_error = True; | ||
| return(0); | ||
| } else | ||
| return(X_handler(d,e)); | ||
| } | ||
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| static SDL_bool have_mitshm(void) | ||
| { | ||
| /* Only use shared memory on local X servers */ | ||
| if ( (SDL_strncmp(XDisplayName(NULL), ":", 1) == 0) || | ||
| (SDL_strncmp(XDisplayName(NULL), "unix:", 5) == 0) ) { | ||
| return SDL_X11_HAVE_SHM; | ||
| } | ||
| return SDL_FALSE; | ||
| } | ||
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| #endif /* !NO_SHARED_MEMORY */ | ||
|
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| int | ||
| X11_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, | ||
| void ** pixels, int *pitch) | ||
| { | ||
| SDL_WindowData *data = (SDL_WindowData *) window->driverdata; | ||
| Display *display = data->videodata->display; | ||
| XGCValues gcv; | ||
| XVisualInfo vinfo; | ||
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| /* Free the old framebuffer surface */ | ||
| X11_DestroyWindowFramebuffer(_this, window); | ||
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| /* Create the graphics context for drawing */ | ||
| gcv.graphics_exposures = False; | ||
| data->gc = XCreateGC(display, data->xwindow, GCGraphicsExposures, &gcv); | ||
| if (!data->gc) { | ||
| SDL_SetError("Couldn't create graphics context"); | ||
| return -1; | ||
| } | ||
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| /* Find out the pixel format and depth */ | ||
| if (X11_GetVisualInfoFromVisual(display, data->visual, &vinfo) < 0) { | ||
| SDL_SetError("Couldn't get window visual information"); | ||
| return -1; | ||
| } | ||
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| *format = X11_GetPixelFormatFromVisualInfo(display, &vinfo); | ||
| if (*format == SDL_PIXELFORMAT_UNKNOWN) { | ||
| SDL_SetError("Unknown window pixel format"); | ||
| return -1; | ||
| } | ||
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| /* Calculate pitch */ | ||
| *pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3); | ||
|
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| /* Create the actual image */ | ||
| #ifndef NO_SHARED_MEMORY | ||
| if (have_mitshm()) { | ||
| XShmSegmentInfo *shminfo = &data->shminfo; | ||
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| shminfo->shmid = shmget(IPC_PRIVATE, window->h*(*pitch), IPC_CREAT | 0777); | ||
| if ( shminfo->shmid >= 0 ) { | ||
| shminfo->shmaddr = (char *)shmat(shminfo->shmid, 0, 0); | ||
| shminfo->readOnly = False; | ||
| if ( shminfo->shmaddr != (char *)-1 ) { | ||
| shm_error = False; | ||
| X_handler = XSetErrorHandler(shm_errhandler); | ||
| XShmAttach(display, shminfo); | ||
| XSync(display, True); | ||
| XSetErrorHandler(X_handler); | ||
| if ( shm_error ) | ||
| shmdt(shminfo->shmaddr); | ||
| } else { | ||
| shm_error = True; | ||
| } | ||
| shmctl(shminfo->shmid, IPC_RMID, NULL); | ||
| } else { | ||
| shm_error = True; | ||
| } | ||
| if (!shm_error) { | ||
| data->ximage = XShmCreateImage(display, data->visual, | ||
| vinfo.depth, ZPixmap, | ||
| shminfo->shmaddr, shminfo, | ||
| window->w, window->h); | ||
| if (!data->ximage) { | ||
| XShmDetach(display, shminfo); | ||
| XSync(display, False); | ||
| shmdt(shminfo->shmaddr); | ||
| } else { | ||
| /* Done! */ | ||
| data->use_mitshm = SDL_TRUE; | ||
| *pixels = shminfo->shmaddr; | ||
| return 0; | ||
| } | ||
| } | ||
| } | ||
| #endif /* not NO_SHARED_MEMORY */ | ||
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| *pixels = SDL_malloc(window->h*(*pitch)); | ||
| if (*pixels == NULL) { | ||
| SDL_OutOfMemory(); | ||
| return -1; | ||
| } | ||
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| data->ximage = XCreateImage(display, data->visual, | ||
| vinfo.depth, ZPixmap, 0, (char *)(*pixels), | ||
| window->w, window->h, 32, 0); | ||
| if (!data->ximage) { | ||
| SDL_free(*pixels); | ||
| SDL_SetError("Couldn't create XImage"); | ||
| return -1; | ||
| } | ||
| return 0; | ||
| } | ||
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| int | ||
| X11_UpdateWindowFramebuffer(_THIS, SDL_Window * window, | ||
| int numrects, SDL_Rect * rects) | ||
| { | ||
| SDL_WindowData *data = (SDL_WindowData *) window->driverdata; | ||
| Display *display = data->videodata->display; | ||
| int i; | ||
| SDL_Rect *rect; | ||
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| #ifndef NO_SHARED_MEMORY | ||
| if (data->use_mitshm) { | ||
| for (i = 0; i < numrects; ++i) { | ||
| rect = &rects[i]; | ||
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| if (rect->w == 0 || rect->h == 0) { /* Clipped? */ | ||
| continue; | ||
| } | ||
| XShmPutImage(display, data->xwindow, data->gc, data->ximage, | ||
| rect->x, rect->y, | ||
| rect->x, rect->y, rect->w, rect->h, False); | ||
| } | ||
| } | ||
| else | ||
| #endif /* !NO_SHARED_MEMORY */ | ||
| { | ||
| for (i = 0; i < numrects; ++i) { | ||
| rect = &rects[i]; | ||
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| if (rect->w == 0 || rect->h == 0) { /* Clipped? */ | ||
| continue; | ||
| } | ||
| XPutImage(display, data->xwindow, data->gc, data->ximage, | ||
| rect->x, rect->y, | ||
| rect->x, rect->y, rect->w, rect->h); | ||
| } | ||
| } | ||
| XSync(display, False); | ||
| } | ||
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| void | ||
| X11_DestroyWindowFramebuffer(_THIS, SDL_Window * window) | ||
| { | ||
| SDL_WindowData *data = (SDL_WindowData *) window->driverdata; | ||
| Display *display = data->videodata->display; | ||
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| if (data->ximage) { | ||
| XDestroyImage(data->ximage); | ||
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| #ifndef NO_SHARED_MEMORY | ||
| if (data->use_mitshm) { | ||
| XShmDetach(display, &data->shminfo); | ||
| XSync(display, False); | ||
| shmdt(data->shminfo.shmaddr); | ||
| data->use_mitshm = SDL_FALSE; | ||
| } | ||
| #endif /* !NO_SHARED_MEMORY */ | ||
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| data->ximage = NULL; | ||
| } | ||
| if (data->gc) { | ||
| XFreeGC(display, data->gc); | ||
| data->gc = NULL; | ||
| } | ||
| } | ||
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| /* vi: set ts=4 sw=4 expandtab: */ |
| @@ -0,0 +1,32 @@ | ||
| /* | ||
| SDL - Simple DirectMedia Layer | ||
| Copyright (C) 1997-2009 Sam Lantinga | ||
| This library is free software; you can redistribute it and/or | ||
| modify it under the terms of the GNU Lesser General Public | ||
| License as published by the Free Software Foundation; either | ||
| version 2.1 of the License, or (at your option) any later version. | ||
| This library is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| Lesser General Public License for more details. | ||
| You should have received a copy of the GNU Lesser General Public | ||
| License along with this library; if not, write to the Free Software | ||
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | ||
| Sam Lantinga | ||
| slouken@libsdl.org | ||
| */ | ||
| #include "SDL_config.h" | ||
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| extern int X11_CreateWindowFramebuffer(_THIS, SDL_Window * window, | ||
| Uint32 * format, | ||
| void ** pixels, int *pitch); | ||
| extern int X11_UpdateWindowFramebuffer(_THIS, SDL_Window * window, | ||
| int numrects, SDL_Rect * rects); | ||
| extern void X11_DestroyWindowFramebuffer(_THIS, SDL_Window * window); | ||
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| /* vi: set ts=4 sw=4 expandtab: */ |