swaybar: fix cursor scale

This fixes a few issues with swaybar's cursor scaling:
1. The cursor scale is now changed when the output scale changes
2. The cursor scale is no longer bound by the max output scale when
swaybar is launched
3. Related to the previous item, the cursor is no longer tiny on low
scale outputs after the max output scale has changed

This also bumps up `wl_compositor` to version 4 to allow usage of
`wl_surface_damage_buffer`.

1 files changed, 5 insertions, 17 deletions

diff --git a/swaybar/bar.c b/swaybar/bar.c
index 47c89a39..53e798bc 100644
--- a/swaybar/bar.c
+++ b/swaybar/bar.c
@@ -196,6 +196,10 @@ static void output_scale(void *data, struct wl_output *wl_output,
                 int32_t factor) {
         struct swaybar_output *output = data;
         output->scale = factor;
+        if (output == output->bar->pointer.current) {
+                update_cursor(output->bar);
+                render_frame(output);
+        }
 }
 
 struct wl_output_listener output_listener = {
@@ -273,7 +277,7 @@ static void handle_global(void *data, struct wl_registry *registry,
         struct swaybar *bar = data;
         if (strcmp(interface, wl_compositor_interface.name) == 0) {
                 bar->compositor = wl_registry_bind(registry, name,
-                                &wl_compositor_interface, 3);
+                                &wl_compositor_interface, 4);
         } else if (strcmp(interface, wl_seat_interface.name) == 0) {
                 bar->seat = wl_registry_bind(registry, name,
                                 &wl_seat_interface, 3);
@@ -355,22 +359,6 @@ bool bar_setup(struct swaybar *bar, const char *socket_path) {
         wl_display_roundtrip(bar->display);
 
         struct swaybar_pointer *pointer = &bar->pointer;
-
-        int max_scale = 1;
-        struct swaybar_output *output;
-        wl_list_for_each(output, &bar->outputs, link) {
-                if (output->scale > max_scale) {
-                        max_scale = output->scale;
-                }
-        }
-
-        pointer->cursor_theme =
-                wl_cursor_theme_load(NULL, 24 * max_scale, bar->shm);
-        assert(pointer->cursor_theme);
-        struct wl_cursor *cursor;
-        cursor = wl_cursor_theme_get_cursor(pointer->cursor_theme, "left_ptr");
-        assert(cursor);
-        pointer->cursor_image = cursor->images[0];
         pointer->cursor_surface = wl_compositor_create_surface(bar->compositor);
         assert(pointer->cursor_surface);