071c4251d8
This patch adds support for multi-screen setups by using xinerama information if available to determine the screen size and position. In case xinerama is not available or not active it uses the information provided for the x screen. To clean up the code some generic helper functions were moved to a separate source file.
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;
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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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