libweston: Compute output protection when head is attached

A head may have its output protection set before it is attached to an
output. Recompute the output protection whenever a head is attached to
make sure it correctly set in output.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>

libweston/compositor.c

@@ -5803,6 +5803,33 @@ weston_output_iterate_heads(struct weston_output *output,
 	return container_of(node, struct weston_head, output_link);
 }
 
+static void
+weston_output_compute_protection(struct weston_output *output)
+{
+	struct weston_head *head;
+	enum weston_hdcp_protection op_protection;
+	bool op_protection_valid = false;
+	struct weston_compositor *wc = output->compositor;
+
+	wl_list_for_each(head, &output->head_list, output_link) {
+		if (!op_protection_valid) {
+			op_protection = head->current_protection;
+			op_protection_valid = true;
+		}
+		if (head->current_protection < op_protection)
+			op_protection = head->current_protection;
+	}
+
+	if (!op_protection_valid)
+		op_protection = WESTON_HDCP_DISABLE;
+
+	if (output->current_protection != op_protection) {
+		output->current_protection = op_protection;
+		weston_output_damage(output);
+		weston_schedule_surface_protection_update(wc);
+	}
+}
+
 /** Attach a head to an output
  *
  * \param output The output to attach to.
@@ -5842,6 +5869,8 @@ weston_output_attach_head(struct weston_output *output,
 	head->output = output;
 	wl_list_insert(output->head_list.prev, &head->output_link);
 
+	weston_output_compute_protection(output);
+
 	if (output->enabled) {
 		weston_head_add_global(head);
 
@@ -6154,33 +6183,6 @@ weston_head_set_supported_eotf_mask(struct weston_head *head,
 	weston_head_set_device_changed(head);
 }
 
-static void
-weston_output_compute_protection(struct weston_output *output)
-{
-	struct weston_head *head;
-	enum weston_hdcp_protection op_protection;
-	bool op_protection_valid = false;
-	struct weston_compositor *wc = output->compositor;
-
-	wl_list_for_each(head, &output->head_list, output_link) {
-		if (!op_protection_valid) {
-			op_protection = head->current_protection;
-			op_protection_valid = true;
-		}
-		if (head->current_protection < op_protection)
-			op_protection = head->current_protection;
-	}
-
-	if (!op_protection_valid)
-		op_protection = WESTON_HDCP_DISABLE;
-
-	if (output->current_protection != op_protection) {
-		output->current_protection = op_protection;
-		weston_output_damage(output);
-		weston_schedule_surface_protection_update(wc);
-	}
-}
-
 WL_EXPORT void
 weston_head_set_content_protection_status(struct weston_head *head,
 					  enum weston_hdcp_protection status)