compositor-x11: Set window icon

compositor/compositor-x11.c

@@ -61,8 +61,10 @@ struct x11_compositor {
 		xcb_atom_t		 wm_delete_window;
 		xcb_atom_t		 wm_class;
 		xcb_atom_t		 net_wm_name;
+		xcb_atom_t		 net_wm_icon;
 		xcb_atom_t		 string;
 		xcb_atom_t		 utf8_string;
+		xcb_atom_t		 cardinal;
 	} atom;
 };
 
@@ -330,6 +332,31 @@ struct wm_normal_hints {
 #define WM_NORMAL_HINTS_MIN_SIZE	16
 #define WM_NORMAL_HINTS_MAX_SIZE	32
 
+static void
+x11_output_set_icon(struct x11_compositor *c, struct x11_output *output,
+		    const char *filename, int width, int height)
+{
+	uint32_t *icon, *pixels;
+
+	pixels = wlsc_load_image(filename, width, height);
+	if (!pixels)
+		return;
+	icon = malloc(width * height * 4 + 8);
+	if (!icon) {
+		free(pixels);
+		return;
+	}
+
+	icon[0] = width;
+	icon[1] = height;
+	memcpy(icon + 2, pixels, width * height * 4);
+	xcb_change_property(c->conn, XCB_PROP_MODE_REPLACE, output->window,
+			    c->atom.net_wm_icon, c->atom.cardinal, 32,
+			    width * height + 2, icon);
+	free(icon);
+	free(pixels);
+}
+
 static int
 x11_compositor_create_output(struct x11_compositor *c, int width, int height)
 {
@@ -409,6 +436,9 @@ x11_compositor_create_output(struct x11_compositor *c, int width, int height)
 			    c->atom.wm_class, c->atom.string, 8,
 			    sizeof class, class);
 
+	x11_output_set_icon(c, output,
+			    DATADIR "/wayland/wayland.png", 128, 128);
+
 	xcb_map_window(c->conn, output->window);
 
 	rectangle.x = 0;
@@ -611,8 +641,10 @@ x11_compositor_get_resources(struct x11_compositor *c)
 		{ "WM_DELETE_WINDOW",	F(atom.wm_delete_window) },
 		{ "WM_CLASS",		F(atom.wm_class) },
 		{ "_NET_WM_NAME",	F(atom.net_wm_name) },
+		{ "_NET_WM_ICON",	F(atom.net_wm_icon) },
 		{ "STRING",		F(atom.string) },
 		{ "UTF8_STRING",	F(atom.utf8_string) },
+		{ "CARDINAL",		F(atom.cardinal) },
 	};
 
 	xcb_intern_atom_cookie_t cookies[ARRAY_SIZE(atoms)];

compositor/compositor.c

@@ -189,21 +189,22 @@ destroy_surface(struct wl_resource *resource, struct wl_client *client)
 	wlsc_compositor_schedule_repaint(compositor);
 }
 
-static struct wl_buffer *
-create_buffer_from_png(struct wlsc_compositor *ec,
-		       const char *filename, int width, int height)
+uint32_t *
+wlsc_load_image(const char *filename, int width, int height)
 {
 	GdkPixbuf *pixbuf;
 	GError *error = NULL;
 	int stride, i, n_channels;
 	unsigned char *pixels, *end, *argb_pixels, *s, *d;
-	struct wl_buffer *buffer;
 
 	pixbuf = gdk_pixbuf_new_from_file_at_scale(filename,
 						   width, height,
 						   FALSE, &error);
-	if (error != NULL)
+	if (error != NULL) {
+		fprintf(stderr, "failed to load image: %s\n", error->message);
+		g_error_free(error);
 		return NULL;
+	}
 
 	stride = gdk_pixbuf_get_rowstride(pixbuf);
 	pixels = gdk_pixbuf_get_pixels(pixbuf);
@@ -252,11 +253,23 @@ create_buffer_from_png(struct wlsc_compositor *ec,
 
 	g_object_unref(pixbuf);
 
+	return (uint32_t *) argb_pixels;
+}
+
+static struct wl_buffer *
+create_buffer_from_png(struct wlsc_compositor *ec,
+		       const char *filename, int width, int height)
+{
+	uint32_t *pixels;
+	struct wl_buffer *buffer;
+
+	pixels = wlsc_load_image(filename, width, height);
+
 	buffer = ec->create_buffer(ec, width, height,
 				   &ec->compositor.premultiplied_argb_visual,
-				   argb_pixels);
+				   pixels);
 
-	free(argb_pixels);
+	free(pixels);
 
 	return buffer;
 }

compositor/compositor.h

@@ -230,4 +230,7 @@ tty_destroy(struct tty *tty);
 void
 screenshooter_create(struct wlsc_compositor *ec);
 
+uint32_t *
+wlsc_load_image(const char *filename, int width, int height);
+
 #endif

data/Makefile.am

@@ -19,4 +19,8 @@ dist_waylanddata_DATA =				\
 	top_right_corner.png			\
 	top_side.png				\
 	xterm.png				\
-	wayland.svg
+	wayland.svg				\
+	wayland.png
+
+wayland.png : wayland.svg
+	rsvg-convert -w 128 -h 128 wayland.svg -o wayland.png