151 lines
3.1 KiB
C
151 lines
3.1 KiB
C
/*
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Copyright (C) 2014 by Leonhard Oelke <leonhard@in-verted.de>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include <sys/shm.h>
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#include <X11/Xutil.h>
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#include <X11/extensions/Xinerama.h>
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#include "xhelpers.h"
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int_fast32_t xinerama_is_active(Display *dpy)
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{
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int minor, major;
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if (!dpy)
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return 0;
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if (!XineramaQueryVersion(dpy, &minor, &major))
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return 0;
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if (!XineramaIsActive(dpy))
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return 0;
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return 1;
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}
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int_fast32_t xinerama_screen_count(Display *dpy)
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{
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int screens;
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if (!dpy)
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return 0;
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XFree(XineramaQueryScreens(dpy, &screens));
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return screens;
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}
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int_fast32_t xinerama_screen_geo(Display *dpy, const int_fast32_t screen,
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int_fast32_t *x, int_fast32_t *y, int_fast32_t *w, int_fast32_t *h)
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{
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int screens;
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XineramaScreenInfo *info = NULL;
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if (!dpy)
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goto fail;
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info = XineramaQueryScreens(dpy, &screens);
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if (screen < 0 || screen >= screens)
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goto fail;
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*x = info[screen].x_org;
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*y = info[screen].y_org;
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*w = info[screen].width;
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*h = info[screen].height;
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XFree(info);
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return 0;
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fail:
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if (info)
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XFree(info);
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*x = *y = *w = *h = 0;
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return -1;
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}
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int_fast32_t x11_screen_geo(Display *dpy, const int_fast32_t screen,
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int_fast32_t *w, int_fast32_t *h)
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{
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Screen *scr;
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if (!dpy || screen < 0 || screen >= XScreenCount(dpy))
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goto fail;
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scr = XScreenOfDisplay(dpy, screen);
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if (!scr)
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goto fail;
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*w = XWidthOfScreen(scr);
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*h = XHeightOfScreen(scr);
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return 0;
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fail:
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*w = *h = 0;
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return -1;
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}
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xshm_t *xshm_attach(Display *dpy, Screen *screen,
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int_fast32_t w, int_fast32_t h)
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{
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if (!dpy || !screen)
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return NULL;
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xshm_t *xshm = bzalloc(sizeof(xshm_t));
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xshm->dpy = dpy;
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xshm->image = XShmCreateImage(xshm->dpy, DefaultVisualOfScreen(screen),
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DefaultDepthOfScreen(screen), ZPixmap, NULL, &xshm->info,
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w, h);
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if (!xshm->image)
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goto fail;
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xshm->info.shmid = shmget(IPC_PRIVATE,
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xshm->image->bytes_per_line * xshm->image->height,
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IPC_CREAT | 0700);
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if (xshm->info.shmid < 0)
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goto fail;
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xshm->info.shmaddr
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= xshm->image->data
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= (char *) shmat(xshm->info.shmid, 0, 0);
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if (xshm->info.shmaddr == (char *) -1)
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goto fail;
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xshm->info.readOnly = false;
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if (!XShmAttach(xshm->dpy, &xshm->info))
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goto fail;
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xshm->attached = true;
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return xshm;
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fail:
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xshm_detach(xshm);
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return NULL;
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}
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void xshm_detach(xshm_t *xshm)
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{
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if (!xshm)
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return;
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if (xshm->attached)
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XShmDetach(xshm->dpy, &xshm->info);
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if (xshm->info.shmaddr != (char *) -1)
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shmdt(xshm->info.shmaddr);
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if (xshm->info.shmid != -1)
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shmctl(xshm->info.shmid, IPC_RMID, NULL);
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if (xshm->image)
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XDestroyImage(xshm->image);
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bfree(xshm);
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}
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