# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1454055778 -7200
# Node ID 86e57e56a4545fc0cf6b056b71d77cde6b5aaafb
# Parent  57050ca14de609bb667bfbb13c1776b2fe515bc9
passing events through the overlay window

diff -r 57050ca14de6 -r 86e57e56a454 Makefile
--- a/Makefile	Fri Jan 22 22:33:34 2016 +0200
+++ b/Makefile	Fri Jan 29 10:22:58 2016 +0200
@@ -13,7 +13,7 @@
 
 CFLAGS = $(warn) $(dbg) $(opt) $(incpaths)
 CXXFLAGS = -std=c++11 $(warn) $(dbg) $(opt) $(incpaths)
-LDFLAGS = -lGL -lGLEW -lX11 -lXext -lXcomposite -lXdamage -lm -lpthread
+LDFLAGS = -lGL -lGLEW -lX11 -lXext -lXcomposite -lXdamage -lXfixes -lm -lpthread
 
 $(bin): $(obj)
 	$(CXX) -o $@ $(obj) $(LDFLAGS)
diff -r 57050ca14de6 -r 86e57e56a454 src/main.cc
--- a/src/main.cc	Fri Jan 22 22:33:34 2016 +0200
+++ b/src/main.cc	Fri Jan 29 10:22:58 2016 +0200
@@ -6,10 +6,12 @@
 #include <X11/Xatom.h>
 #include <X11/extensions/Xcomposite.h>
 #include <X11/extensions/Xdamage.h>
+#include <X11/extensions/shape.h>
 #include "cwin.h"
 #include "opengl.h"
 #include "logger.h"
 
+static bool query_extensions();
 static bool register_compositor();
 static void start_comp();
 static void manage_window(Window xwin);
@@ -23,6 +25,9 @@
 Window root_win, comp_win;
 int root_width, root_height;
 
+static int xdmg_ev_base, xdmg_err_base;
+static int xshape_ev_base, xshape_err_base;
+
 int main(int argc, char **argv)
 {
 	if(!(dpy = XOpenDisplay(0))) {
@@ -35,26 +40,9 @@
 	root_height = DisplayHeight(dpy, screen_num);
 	log_info("display size %dx%d\n", root_width, root_height);
 
-	int xcomp_ev_base, xcomp_err_base;
-	if(!XCompositeQueryExtension(dpy, &xcomp_ev_base, &xcomp_err_base)) {
-		log_error("X server doesn't support the composite extension\n");
+	if(!query_extensions()) {
 		return 1;
 	}
-	int xcomp_ver_major = 0, xcomp_ver_minor = 4;
-	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 <= 0 && xcomp_ver_minor < 3) {
-		// for NameWindowPixmap & CompositeGetoverlayWindow
-		log_error("I need at least version 0.3\n");
-		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;
@@ -80,6 +68,11 @@
 			break;
 
 		case ConfigureNotify:
+			// XXX is this right?
+			if((cwin = find_window_xid(ev.xconfigure.window))) {
+				log_debug("updating window attributes\n");
+				XGetWindowAttributes(dpy, cwin->xwin, &cwin->attr);
+			}
 			break;
 
 		case DestroyNotify:
@@ -117,9 +110,54 @@
 			if(ev.type == xdmg_ev_base + XDamageNotify) {
 			}
 		}
+
+		redraw();
 	}
 }
 
+static bool query_extensions()
+{
+	int xcomp_ev_base, xcomp_err_base;
+	if(!XCompositeQueryExtension(dpy, &xcomp_ev_base, &xcomp_err_base)) {
+		log_error("X server doesn't support the composite extension\n");
+		return false;
+	}
+	int xcomp_ver_major, xcomp_ver_minor;
+	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 <= 0 && xcomp_ver_minor < 3) {
+		// for NameWindowPixmap & CompositeGetoverlayWindow
+		log_error("I need at least version 0.3\n");
+		return false;
+	}
+
+	if(!XDamageQueryExtension(dpy, &xdmg_ev_base, &xdmg_err_base)) {
+		log_error("X server doesn't support the damage extension\n");
+		return false;
+	}
+
+	if(!XShapeQueryExtension(dpy, &xshape_ev_base, &xshape_err_base)) {
+		log_error("X server doesn't support the shape extension\n");
+		return false;
+	}
+
+	int xfix_ev_base, xfix_err_base;
+	if(!XFixesQueryExtension(dpy, &xfix_ev_base, &xfix_err_base)) {
+		log_error("X server doesn't support the Xfixes extension\n");
+		return false;
+	}
+
+	int xfix_ver_major, xfix_ver_minor;
+	XFixesQueryVersion(dpy, &xfix_ver_major, &xfix_ver_minor);
+	log_info("Found xfixes version %d.%d\n", xfix_ver_major, xfix_ver_minor);
+	if(xfix_ver_major < 2) {
+		// for SetWindowShapeRegion
+		log_error("I need at least version 2.0\n");
+		return false;
+	}
+	return true;
+}
+
 static bool register_compositor()
 {
 	char atom_name[64];
@@ -154,8 +192,14 @@
 	}
 	log_info("starting compositor, managing %u top-level windows\n", num_children);
 	XFree(children);
+	XUngrabServer(dpy);
 
-	XUngrabServer(dpy);
+	/* set a zero-area input-shape for the overlay window to let events
+	 * through to the windows under it
+	 */
+	XserverRegion region = XFixesCreateRegion(dpy, 0, 0);
+	XFixesSetWindowShapeRegion(dpy, comp_win, ShapeInput, 0, 0, region);
+	XFixesDestroyRegion(dpy, region);
 }
 
 static void manage_window(Window xwin)