gears: Fail if compiled without cairo-egl

clients/gears.c

@@ -207,9 +207,12 @@ draw_gears(struct gears *gears)
 	window_get_child_allocation(gears->window, &allocation);
 	window_get_allocation(gears->window, &window_allocation);
 
-	display_acquire_window_surface(gears->d,
-				       gears->window,
-				       gears->context);
+	if (display_acquire_window_surface(gears->d,
+					    gears->window,
+					    gears->context) < 0) {
+		die("Unable to acquire window surface, "
+		    "compiled without cairo-egl?\n");
+	}
 	
 	glViewport(allocation.x,
 		   window_allocation.height - allocation.height - allocation.x,

clients/window.c

@@ -2211,7 +2211,7 @@ display_get_shell(struct display *display)
 	return display->shell;
 }
 
-void
+int
 display_acquire_window_surface(struct display *display,
 			       struct window *window,
 			       EGLContext ctx)
@@ -2221,10 +2221,10 @@ display_acquire_window_surface(struct display *display,
 	cairo_device_t *device;
 
 	if (!window->cairo_surface)
-		return;
+		return -1;
 	device = cairo_surface_get_device(window->cairo_surface);
 	if (!device)
-		return;
+		return -1;
 
 	if (!ctx) {
 		if (device == display->rgb_device)
@@ -2241,6 +2241,10 @@ display_acquire_window_surface(struct display *display,
 	cairo_device_acquire(device);
 	if (!eglMakeCurrent(display->dpy, data->surf, data->surf, ctx))
 		fprintf(stderr, "failed to make surface current\n");
+
+	return 0;
+#else
+	return -1;
 #endif
 }
 

clients/window.h

@@ -67,7 +67,7 @@ display_get_rgb_egl_config(struct display *d);
 EGLConfig
 display_get_argb_egl_config(struct display *d);
 
-void
+int
 display_acquire_window_surface(struct display *display,
 			       struct window *window,
 			       EGLContext ctx);