| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "../../SDL_internal.h" |
| |
| #if SDL_VIDEO_DRIVER_X11 |
| |
| #include "SDL_x11video.h" |
| #include "SDL_x11framebuffer.h" |
| |
| |
| #ifndef NO_SHARED_MEMORY |
| |
| /* 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)); |
| } |
| |
| static SDL_bool have_mitshm(void) |
| { |
| /* Only use shared memory on local X servers */ |
| if ( (SDL_strncmp(X11_XDisplayName(NULL), ":", 1) == 0) || |
| (SDL_strncmp(X11_XDisplayName(NULL), "unix:", 5) == 0) ) { |
| return SDL_X11_HAVE_SHM; |
| } |
| return SDL_FALSE; |
| } |
| |
| #endif /* !NO_SHARED_MEMORY */ |
| |
| 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; |
| |
| /* Free the old framebuffer surface */ |
| X11_DestroyWindowFramebuffer(_this, window); |
| |
| /* Create the graphics context for drawing */ |
| gcv.graphics_exposures = False; |
| data->gc = X11_XCreateGC(display, data->xwindow, GCGraphicsExposures, &gcv); |
| if (!data->gc) { |
| return SDL_SetError("Couldn't create graphics context"); |
| } |
| |
| /* Find out the pixel format and depth */ |
| if (X11_GetVisualInfoFromVisual(display, data->visual, &vinfo) < 0) { |
| return SDL_SetError("Couldn't get window visual information"); |
| } |
| |
| *format = X11_GetPixelFormatFromVisualInfo(display, &vinfo); |
| if (*format == SDL_PIXELFORMAT_UNKNOWN) { |
| return SDL_SetError("Unknown window pixel format"); |
| } |
| |
| /* Calculate pitch */ |
| *pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3); |
| |
| /* Create the actual image */ |
| #ifndef NO_SHARED_MEMORY |
| if (have_mitshm()) { |
| XShmSegmentInfo *shminfo = &data->shminfo; |
| |
| 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 = X11_XSetErrorHandler(shm_errhandler); |
| X11_XShmAttach(display, shminfo); |
| X11_XSync(display, True); |
| X11_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 = X11_XShmCreateImage(display, data->visual, |
| vinfo.depth, ZPixmap, |
| shminfo->shmaddr, shminfo, |
| window->w, window->h); |
| if (!data->ximage) { |
| X11_XShmDetach(display, shminfo); |
| X11_XSync(display, False); |
| shmdt(shminfo->shmaddr); |
| } else { |
| /* Done! */ |
| data->use_mitshm = SDL_TRUE; |
| *pixels = shminfo->shmaddr; |
| return 0; |
| } |
| } |
| } |
| #endif /* not NO_SHARED_MEMORY */ |
| |
| *pixels = SDL_malloc(window->h*(*pitch)); |
| if (*pixels == NULL) { |
| return SDL_OutOfMemory(); |
| } |
| |
| data->ximage = X11_XCreateImage(display, data->visual, |
| vinfo.depth, ZPixmap, 0, (char *)(*pixels), |
| window->w, window->h, 32, 0); |
| if (!data->ximage) { |
| SDL_free(*pixels); |
| return SDL_SetError("Couldn't create XImage"); |
| } |
| return 0; |
| } |
| |
| int |
| X11_UpdateWindowFramebuffer(_THIS, SDL_Window * window, const SDL_Rect * rects, |
| int numrects) |
| { |
| SDL_WindowData *data = (SDL_WindowData *) window->driverdata; |
| Display *display = data->videodata->display; |
| int i; |
| int x, y, w ,h; |
| #ifndef NO_SHARED_MEMORY |
| if (data->use_mitshm) { |
| for (i = 0; i < numrects; ++i) { |
| x = rects[i].x; |
| y = rects[i].y; |
| w = rects[i].w; |
| h = rects[i].h; |
| |
| if (w <= 0 || h <= 0 || (x + w) <= 0 || (y + h) <= 0) { |
| /* Clipped? */ |
| continue; |
| } |
| if (x < 0) |
| { |
| x += w; |
| w += rects[i].x; |
| } |
| if (y < 0) |
| { |
| y += h; |
| h += rects[i].y; |
| } |
| if (x + w > window->w) |
| w = window->w - x; |
| if (y + h > window->h) |
| h = window->h - y; |
| |
| X11_XShmPutImage(display, data->xwindow, data->gc, data->ximage, |
| x, y, x, y, w, h, False); |
| } |
| } |
| else |
| #endif /* !NO_SHARED_MEMORY */ |
| { |
| for (i = 0; i < numrects; ++i) { |
| x = rects[i].x; |
| y = rects[i].y; |
| w = rects[i].w; |
| h = rects[i].h; |
| |
| if (w <= 0 || h <= 0 || (x + w) <= 0 || (y + h) <= 0) { |
| /* Clipped? */ |
| continue; |
| } |
| if (x < 0) |
| { |
| x += w; |
| w += rects[i].x; |
| } |
| if (y < 0) |
| { |
| y += h; |
| h += rects[i].y; |
| } |
| if (x + w > window->w) |
| w = window->w - x; |
| if (y + h > window->h) |
| h = window->h - y; |
| |
| X11_XPutImage(display, data->xwindow, data->gc, data->ximage, |
| x, y, x, y, w, h); |
| } |
| } |
| |
| X11_XSync(display, False); |
| |
| return 0; |
| } |
| |
| void |
| X11_DestroyWindowFramebuffer(_THIS, SDL_Window * window) |
| { |
| SDL_WindowData *data = (SDL_WindowData *) window->driverdata; |
| Display *display; |
| |
| if (!data) { |
| /* The window wasn't fully initialized */ |
| return; |
| } |
| |
| display = data->videodata->display; |
| |
| if (data->ximage) { |
| XDestroyImage(data->ximage); |
| |
| #ifndef NO_SHARED_MEMORY |
| if (data->use_mitshm) { |
| X11_XShmDetach(display, &data->shminfo); |
| X11_XSync(display, False); |
| shmdt(data->shminfo.shmaddr); |
| data->use_mitshm = SDL_FALSE; |
| } |
| #endif /* !NO_SHARED_MEMORY */ |
| |
| data->ximage = NULL; |
| } |
| if (data->gc) { |
| X11_XFreeGC(display, data->gc); |
| data->gc = NULL; |
| } |
| } |
| |
| #endif /* SDL_VIDEO_DRIVER_X11 */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |