Use opaque region to determine if frame done should be sent

1 files changed, 15 insertions, 0 deletions

diff --git a/swaylock/main.c b/swaylock/main.c
index f31ed679..a7a68e9b 100644
--- a/swaylock/main.c
+++ b/swaylock/main.c
@@ -111,12 +111,27 @@ static void create_layer_surface(struct swaylock_surface *surface) {
         wl_surface_commit(surface->surface);
 }
 
+static bool image_is_opaque(cairo_surface_t *image) {
+        return cairo_surface_get_content(image) == CAIRO_CONTENT_COLOR;
+}
+
 static void layer_surface_configure(void *data,
                 struct zwlr_layer_surface_v1 *layer_surface,
                 uint32_t serial, uint32_t width, uint32_t height) {
         struct swaylock_surface *surface = data;
         surface->width = width;
         surface->height = height;
+
+        if (image_is_opaque(surface->image) &&
+                        surface->state->args.mode != BACKGROUND_MODE_CENTER &&
+                        surface->state->args.mode != BACKGROUND_MODE_FIT) {
+                struct wl_region *region =
+                        wl_compositor_create_region(surface->state->compositor);
+                wl_region_add(region, 0, 0, width, height);
+                wl_surface_set_opaque_region(surface->surface, region);
+                wl_region_destroy(region);
+        }
+
         zwlr_layer_surface_v1_ack_configure(layer_surface, serial);
         render_frame(surface);
 }