1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <unistd.h>

4 #include <X11/Xlib.h>

5 #include <X11/Xutil.h>

6 #include <X11/Xatom.h>

7 #include <X11/extensions/Xcomposite.h>

8 #include <X11/extensions/Xdamage.h>

9 #include <GL/glew.h>

10 #include "cwin.h"

11 #include "logger.h"

12

13 static bool register_compositor();

14

15 static Display *dpy;

16 static int scr;

17 static Window root_win;

18 static int root_width, root_height;

19

20 int main(int argc, char **argv)

21 {

22 if(!(dpy = XOpenDisplay(0))) {

23 log_error("failed to open X display\n");

24 return 1;

25 }

26 scr = DefaultScreen(dpy);

27 root_win = RootWindow(dpy, scr);

28 root_width = DisplayWidth(dpy, scr);

29 root_height = DisplayHeight(dpy, scr);

30 log_info("display size %dx%d\n", root_width, root_height);

31

32 int xcomp_ev_base, xcomp_err_base, xcomp_ver_major, xcomp_ver_minor;

33 if(!XCompositeQueryExtension(dpy, &xcomp_ev_base, &xcomp_err_base)) {

34 log_error("X server doesn't support the composite extension\n");

35 return 1;

36 }

37 XCompositeQueryVersion(dpy, &xcomp_ver_major, &xcomp_ver_minor);

38 log_info("Found composite extension version %d.%d\n", xcomp_ver_major, xcomp_ver_minor);

39 if(xcomp_ver_major <= 10 && xcomp_ver_minor < 2) {

40 log_error("I need at least version 1.2\n"); // for NameWindowPixmap

41 return 1;

42 }

43

44 int xdmg_ev_base, xdmg_err_base;

45 if(!XDamageQueryExtension(dpy, &xdmg_ev_base, &xdmg_err_base)) {

46 log_error("X server doesn't support the damage extension\n");

47 return 1;

48 }

49 // TODO also XFixes ?

50

51 if(!register_compositor()) {

52 return 1;

53 }

54

55 XGrabServer(dpy);

56 XCompositeRedirectSubwindows(dpy, root_win, CompositeRedirectAutomatic);

57 XUngrabServer(dpy);

58

59 for(;;) {

60 XEvent ev;

61 XNextEvent(dpy, &ev);

62 // TODO

63 }

64 }

65

66 static bool register_compositor()

67 {

68 char atom_name[64];

69 sprintf(atom_name, "_NET_WM_CM_S%d", scr);

70 Atom xa_wm_cm = XInternAtom(dpy, atom_name, False);

71

72 Window win = XGetSelectionOwner(dpy, xa_wm_cm);

73 if(win != None) {

74 log_error("Another compositor is running. Stop it and try again.\n");

75 return false;

76 }

77

78 win = XCreateSimpleWindow(dpy, root_win, 0, 0, 1, 1, 0, None, None);

79 XSetSelectionOwner(dpy, xa_wm_cm, win, 0);

80 return true;

81 }