Initial testing on hidpi clients

include/client/registry.h

@@ -34,6 +34,7 @@ struct output_state {
         struct wl_output *output;
         uint32_t flags;
         uint32_t width, height;
+		uint32_t scale;
 };
 
 struct xkb {

swaybar/bar.c

@@ -152,7 +152,7 @@ void bar_setup(struct bar *bar, const char *socket_path, const char *bar_id) {
 
 		struct output_state *output = bar_output->registry->outputs->items[bar_output->idx];
 
-		bar_output->window = window_setup(bar_output->registry, output->width, 30, false);
+		bar_output->window = window_setup(bar_output->registry, output->width * output->scale, 30 * output->scale, false);
 		if (!bar_output->window) {
 			sway_abort("Failed to create window.");
 		}

wayland/buffers.c

@@ -75,6 +75,7 @@ static struct buffer *create_buffer(struct window *window, struct buffer *buf,
 	buf->surface = cairo_image_surface_create_for_data(data, CAIRO_FORMAT_ARGB32, width, height, stride);
 	buf->cairo = cairo_create(buf->surface);
 	buf->pango = pango_cairo_create_context(buf->cairo);
+	pango_cairo_context_set_resolution(buf->pango, 96 * 2);
 
 	wl_buffer_add_listener(buf->buffer, &buffer_listener, buf);
 	return buf;

wayland/registry.c

@@ -32,7 +32,8 @@ static void display_handle_done(void *data, struct wl_output *wl_output) {
 }
 
 static void display_handle_scale(void *data, struct wl_output *wl_output, int32_t factor) {
-	// this space intentionally left blank
+	struct output_state *state = data;
+	state->scale = factor;
 }
 
 static const struct wl_output_listener output_listener = {
@@ -220,6 +221,7 @@ static void registry_global(void *data, struct wl_registry *registry,
 		struct wl_output *output = wl_registry_bind(registry, name, &wl_output_interface, version);
 		struct output_state *ostate = malloc(sizeof(struct output_state));
 		ostate->output = output;
+		ostate->scale = 1;
 		wl_output_add_listener(output, &output_listener, ostate);
 		list_add(reg->outputs, ostate);
 	} else if (strcmp(interface, desktop_shell_interface.name) == 0) {