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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <unistd.h>
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4 #include <X11/Xlib.h>
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5 #include <X11/Xutil.h>
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6 #include <X11/Xatom.h>
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7 #include <X11/extensions/Xcomposite.h>
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8 #include <X11/extensions/Xdamage.h>
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9 #include <GL/glew.h>
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10 #include "cwin.h"
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11 #include "logger.h"
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12
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13 static bool register_compositor();
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14
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15 static Display *dpy;
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16 static int scr;
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17 static Window root_win;
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18 static int root_width, root_height;
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19
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20 int main(int argc, char **argv)
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21 {
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22 if(!(dpy = XOpenDisplay(0))) {
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23 log_error("failed to open X display\n");
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24 return 1;
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25 }
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26 scr = DefaultScreen(dpy);
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27 root_win = RootWindow(dpy, scr);
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28 root_width = DisplayWidth(dpy, scr);
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29 root_height = DisplayHeight(dpy, scr);
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30 log_info("display size %dx%d\n", root_width, root_height);
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31
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32 int xcomp_ev_base, xcomp_err_base, xcomp_ver_major, xcomp_ver_minor;
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33 if(!XCompositeQueryExtension(dpy, &xcomp_ev_base, &xcomp_err_base)) {
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34 log_error("X server doesn't support the composite extension\n");
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35 return 1;
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36 }
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37 XCompositeQueryVersion(dpy, &xcomp_ver_major, &xcomp_ver_minor);
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38 log_info("Found composite extension version %d.%d\n", xcomp_ver_major, xcomp_ver_minor);
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39 if(xcomp_ver_major <= 10 && xcomp_ver_minor < 2) {
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40 log_error("I need at least version 1.2\n"); // for NameWindowPixmap
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41 return 1;
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42 }
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43
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44 int xdmg_ev_base, xdmg_err_base;
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45 if(!XDamageQueryExtension(dpy, &xdmg_ev_base, &xdmg_err_base)) {
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46 log_error("X server doesn't support the damage extension\n");
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47 return 1;
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48 }
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49 // TODO also XFixes ?
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50
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51 if(!register_compositor()) {
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52 return 1;
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53 }
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54
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55 XGrabServer(dpy);
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56 XCompositeRedirectSubwindows(dpy, root_win, CompositeRedirectAutomatic);
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57 XUngrabServer(dpy);
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58
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59 for(;;) {
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60 XEvent ev;
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61 XNextEvent(dpy, &ev);
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62 // TODO
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63 }
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64 }
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65
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66 static bool register_compositor()
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67 {
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68 char atom_name[64];
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69 sprintf(atom_name, "_NET_WM_CM_S%d", scr);
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70 Atom xa_wm_cm = XInternAtom(dpy, atom_name, False);
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71
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72 Window win = XGetSelectionOwner(dpy, xa_wm_cm);
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73 if(win != None) {
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74 log_error("Another compositor is running. Stop it and try again.\n");
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75 return false;
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76 }
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77
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78 win = XCreateSimpleWindow(dpy, root_win, 0, 0, 1, 1, 0, None, None);
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79 XSetSelectionOwner(dpy, xa_wm_cm, win, 0);
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80 return true;
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81 }
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