# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1453409410 -7200
# Node ID b2b7cb950c289a6ee88059538d43177100c5f001
# Parent  d9b3fba68705de5151b6e5d60156d85ede73a7db
window list and compositor registration

diff -r d9b3fba68705 -r b2b7cb950c28 Makefile
--- a/Makefile	Thu Jan 21 08:45:31 2016 +0200
+++ b/Makefile	Thu Jan 21 22:50:10 2016 +0200
@@ -12,8 +12,8 @@
 incpaths = -Isrc/optcfg
 
 CFLAGS = $(warn) $(dbg) $(opt) $(incpaths)
-CXXFLAGS = $(warn) $(dbg) $(opt) $(incpaths)
-LDFLAGS = -lGL -lGLEW -lX11 -lXext -lXcomposite -lm
+CXXFLAGS = -std=c++11 $(warn) $(dbg) $(opt) $(incpaths)
+LDFLAGS = -lGL -lGLEW -lX11 -lXext -lXcomposite -lXdamage -lm -lpthread
 
 $(bin): $(obj)
 	$(CXX) -o $@ $(obj) $(LDFLAGS)
diff -r d9b3fba68705 -r b2b7cb950c28 src/cwin.cc
--- a/src/cwin.cc	Thu Jan 21 08:45:31 2016 +0200
+++ b/src/cwin.cc	Thu Jan 21 22:50:10 2016 +0200
@@ -1,8 +1,9 @@
 #include <vector>
+#include <algorithm>
 #include "cwin.h"
 #include "logger.h"
 
-static std::vector<CompWindow> cwinlist;
+static std::vector<CompWindow*> cwinlist;
 
 void add_window(CompWindow *cwin)
 {
@@ -14,4 +15,54 @@
 	cwinlist.push_back(cwin);
 }
 
-void delete_window(
+bool delete_window(CompWindow *cwin)
+{
+	auto it = std::find(cwinlist.begin(), cwinlist.end(), cwin);
+	if(it != cwinlist.end()) {
+		cwinlist.erase(it);
+		return true;
+	}
+	return false;
+}
+
+bool have_window(CompWindow *cwin)
+{
+	return std::find(cwinlist.begin(), cwinlist.end(), cwin) != cwinlist.end();
+}
+
+CompWindow *find_window_xid(Window xid)
+{
+	if(!xid) return 0;
+
+	for(size_t i=0; i<cwinlist.size(); i++) {
+		if(cwinlist[i]->xwin == xid) {
+			return cwinlist[i];
+		}
+	}
+	return 0;
+}
+
+CompWindow *find_window_pixmap(Pixmap pix)
+{
+	if(!pix) return 0;
+
+	for(size_t i=0; i<cwinlist.size(); i++) {
+		if(cwinlist[i]->xpixmap == pix) {
+			return cwinlist[i];
+		}
+	}
+	return 0;
+}
+
+int get_window_count()
+{
+	return (int)cwinlist.size();
+}
+
+CompWindow *get_window(int idx)
+{
+	if(idx < 0 || idx >= (int)cwinlist.size()) {
+		return 0;
+	}
+	return cwinlist[idx];
+}
diff -r d9b3fba68705 -r b2b7cb950c28 src/cwin.h
--- a/src/cwin.h	Thu Jan 21 08:45:31 2016 +0200
+++ b/src/cwin.h	Thu Jan 21 22:50:10 2016 +0200
@@ -11,9 +11,10 @@
 };
 
 void add_window(CompWindow *cwin);
-void delete_window(CompWindow *cwin);
+bool delete_window(CompWindow *cwin);
 bool have_window(CompWindow *cwin);
 CompWindow *find_window_xid(Window xid);
+CompWindow *find_window_pixmap(Pixmap pix);
 
 int get_window_count();
 CompWindow *get_window(int idx);
diff -r d9b3fba68705 -r b2b7cb950c28 src/main.cc
--- a/src/main.cc	Thu Jan 21 08:45:31 2016 +0200
+++ b/src/main.cc	Thu Jan 21 22:50:10 2016 +0200
@@ -5,5 +5,77 @@
 #include <X11/Xutil.h>
 #include <X11/Xatom.h>
 #include <X11/extensions/Xcomposite.h>
+#include <X11/extensions/Xdamage.h>
 #include <GL/glew.h>
 #include "cwin.h"
+#include "logger.h"
+
+static bool register_compositor();
+
+static Display *dpy;
+static int scr;
+static Window root_win;
+static int root_width, root_height;
+
+int main(int argc, char **argv)
+{
+	if(!(dpy = XOpenDisplay(0))) {
+		log_error("failed to open X display\n");
+		return 1;
+	}
+	scr = DefaultScreen(dpy);
+	root_win = RootWindow(dpy, scr);
+	root_width = DisplayWidth(dpy, scr);
+	root_height = DisplayHeight(dpy, scr);
+	log_info("display size %dx%d\n", root_width, root_height);
+
+	int xcomp_ev_base, xcomp_err_base, xcomp_ver_major, xcomp_ver_minor;
+	if(!XCompositeQueryExtension(dpy, &xcomp_ev_base, &xcomp_err_base)) {
+		log_error("X server doesn't support the composite extension\n");
+		return 1;
+	}
+	XCompositeQueryVersion(dpy, &xcomp_ver_major, &xcomp_ver_minor);
+	log_info("Found composite extension version %d.%d\n", xcomp_ver_major, xcomp_ver_minor);
+	if(xcomp_ver_major <= 10 && xcomp_ver_minor < 2) {
+		log_error("I need at least version 1.2\n");	// for NameWindowPixmap
+		return 1;
+	}
+
+	int xdmg_ev_base, xdmg_err_base;
+	if(!XDamageQueryExtension(dpy, &xdmg_ev_base, &xdmg_err_base)) {
+		log_error("X server doesn't support the damage extension\n");
+		return 1;
+	}
+	// TODO also XFixes ?
+
+	if(!register_compositor()) {
+		return 1;
+	}
+
+	XGrabServer(dpy);
+	XCompositeRedirectSubwindows(dpy, root_win, CompositeRedirectAutomatic);
+	XUngrabServer(dpy);
+
+	for(;;) {
+		XEvent ev;
+		XNextEvent(dpy, &ev);
+		// TODO
+	}
+}
+
+static bool register_compositor()
+{
+	char atom_name[64];
+	sprintf(atom_name, "_NET_WM_CM_S%d", scr);
+	Atom xa_wm_cm = XInternAtom(dpy, atom_name, False);
+
+	Window win = XGetSelectionOwner(dpy, xa_wm_cm);
+	if(win != None) {
+		log_error("Another compositor is running. Stop it and try again.\n");
+		return false;
+	}
+
+	win = XCreateSimpleWindow(dpy, root_win, 0, 0, 1, 1, 0, None, None);
+	XSetSelectionOwner(dpy, xa_wm_cm, win, 0);
+	return true;
+}