Don't track damage for views on inactive tabs

include/sway/input/seat.h

@@ -94,6 +94,12 @@ struct sway_container *seat_get_focus_inactive(struct sway_seat *seat,
 struct sway_container *seat_get_focus_inactive_view(struct sway_seat *seat,
 		struct sway_container *container);
 
+/**
+ * Return the immediate child of container which was most recently focused.
+ */
+struct sway_container *seat_get_active_child(struct sway_seat *seat,
+		struct sway_container *container);
+
 /**
  * Iterate over the focus-inactive children of the container calling the
  * function on each.

include/sway/tree/view.h

@@ -274,4 +274,10 @@ bool view_has_mark(struct sway_view *view, char *mark);
 
 void view_update_marks_textures(struct sway_view *view);
 
+/**
+ * Returns true if there's a possibility the view may be rendered on screen.
+ * Intended for damage tracking.
+ */
+bool view_is_visible(struct sway_view *view);
+
 #endif

sway/desktop/output.c

@@ -754,10 +754,7 @@ static void render_container_tabbed(struct sway_output *output,
 	}
 	struct sway_seat *seat = input_manager_current_seat(input_manager);
 	struct sway_container *focus = seat_get_focus(seat);
-	struct sway_container *current = seat_get_focus_inactive(seat, con);
-	while (current->parent != con) {
-		current = current->parent;
-	}
+	struct sway_container *current = seat_get_active_child(seat, con);
 	struct border_colors *current_colors = NULL;
 
 	// Render tabs
@@ -1082,9 +1079,7 @@ static void output_damage_view(struct sway_output *output,
 		return;
 	}
 
-	struct sway_container *workspace = container_parent(view->swayc,
-			C_WORKSPACE);
-	if (workspace->sway_workspace->fullscreen && !view->is_fullscreen) {
+	if (!view_is_visible(view)) {
 		return;
 	}
 

sway/input/seat.c

@@ -718,6 +718,18 @@ struct sway_container *seat_get_focus_inactive(struct sway_seat *seat,
 	return seat_get_focus_by_type(seat, container, C_TYPES);
 }
 
+struct sway_container *seat_get_active_child(struct sway_seat *seat,
+		struct sway_container *container) {
+	struct sway_container *focus = seat_get_focus_inactive(seat, container);
+	if (!focus) {
+		return NULL;
+	}
+	while (focus->parent != container) {
+		focus = focus->parent;
+	}
+	return focus;
+}
+
 struct sway_container *sway_seat_get_focus(struct sway_seat *seat) {
 	if (!seat->has_focus) {
 		return NULL;

sway/tree/container.c

@@ -522,10 +522,7 @@ static struct sway_container *container_at_tabbed(struct sway_container *parent,
 	}
 
 	// Surfaces
-	struct sway_container *current = seat_get_focus_inactive(seat, parent);
-	while (current->parent != parent) {
-		current = current->parent;
-	}
+	struct sway_container *current = seat_get_active_child(seat, parent);
 
 	return container_at(current, ox, oy, surface, sx, sy);
 }

sway/tree/view.c

@@ -865,3 +865,28 @@ void view_update_marks_textures(struct sway_view *view) {
 			&config->border_colors.urgent);
 	container_damage_whole(view->swayc);
 }
+
+bool view_is_visible(struct sway_view *view) {
+	if (!view->swayc) {
+		return false;
+	}
+	// Check view isn't in a tabbed or stacked container on an inactive tab
+	struct sway_seat *seat = input_manager_current_seat(input_manager);
+	struct sway_container *container = view->swayc;
+	while (container->type != C_WORKSPACE) {
+		if (container->parent->layout == L_TABBED ||
+				container->parent->layout == L_STACKED) {
+			if (seat_get_active_child(seat, container->parent) != container) {
+				return false;
+			}
+		}
+		container = container->parent;
+	}
+	// Check view isn't hidden by another fullscreen view
+	struct sway_container *workspace = container;
+	if (workspace->sway_workspace->fullscreen && !view->is_fullscreen) {
+		return false;
+	}
+	// Check the workspace is visible
+	return workspace_is_visible(workspace);
+}