opt: opitmize subtree surface scale in overview

src/animation/client.h

@@ -243,11 +243,31 @@ void scene_buffer_apply_overview_effect(struct wlr_scene_buffer *buffer,
 										int32_t sx, int32_t sy, void *data) {
 	BufferData *buffer_data = (BufferData *)data;
 
-	if (buffer_data->width > 0 && buffer_data->height > 0) {
+	if (buffer_data->width_scale >= 1.0 || buffer_data->height_scale >= 1.0)
-		wlr_scene_buffer_set_dest_size(buffer, buffer_data->width,
+		return;
-									   buffer_data->height);
+
+	int32_t surface_width = 0;
+	int32_t surface_height = 0;
+	bool is_subsurface = false;
+
+	struct wlr_scene_tree *parent_tree = buffer->node.parent;
+	if (parent_tree->node.data != NULL) {
+		SnapshotMetadata *meta = (SnapshotMetadata *)parent_tree->node.data;
+		surface_width = meta->orig_width;
+		surface_height = meta->orig_height;
+		is_subsurface = meta->is_subsurface;
 	}
 
+	surface_height = surface_height * buffer_data->height_scale;
+	surface_width = surface_width * buffer_data->width_scale;
+
+	if (buffer_data->width > 0 && buffer_data->height > 0) {
+		wlr_scene_buffer_set_dest_size(buffer, surface_width, surface_height);
+	}
+
+	if (is_subsurface)
+		return;
+
 	wlr_scene_buffer_set_corner_radius(buffer, config.border_radius,
 									   buffer_data->corner_location);
 }

src/animation/common.h

@@ -28,6 +28,12 @@ struct dvec2 calculate_animation_curve_at(double t, int32_t type) {
 	return point;
 }
 
+void handle_snapshot_meta_destroy(struct wl_listener *listener, void *data) {
+	SnapshotMetadata *meta = wl_container_of(listener, meta, destroy);
+	wl_list_remove(&meta->destroy.link); // 安全移除监听器
+	free(meta);
+}
+
 void init_baked_points(void) {
 	baked_points_move = calloc(BAKED_POINTS_COUNT, sizeof(*baked_points_move));
 	baked_points_open = calloc(BAKED_POINTS_COUNT, sizeof(*baked_points_open));
@@ -154,12 +160,43 @@ static bool scene_node_snapshot(struct wlr_scene_node *node, int32_t lx,
 		struct wlr_scene_buffer *scene_buffer =
 			wlr_scene_buffer_from_node(node);
 
-		struct wlr_scene_buffer *snapshot_buffer =
+		//  创建中间包装树节点
-			wlr_scene_buffer_create(snapshot_tree, NULL);
+		struct wlr_scene_tree *wrapper = wlr_scene_tree_create(snapshot_tree);
-		if (snapshot_buffer == NULL) {
+		if (wrapper == NULL) {
 			return false;
 		}
-		snapshot_node = &snapshot_buffer->node;
+		snapshot_node = &wrapper->node; // 坐标位移应用在外层包装盒上
+
+		// 收集表面状态并保存为元数据
+		SnapshotMetadata *meta = calloc(1, sizeof(SnapshotMetadata));
+		if (meta == NULL) {
+			wlr_scene_node_destroy(&wrapper->node);
+			return false;
+		}
+		meta->orig_width = scene_buffer->dst_width;
+		meta->orig_height = scene_buffer->dst_height;
+
+		struct wlr_scene_surface *scene_surface =
+			wlr_scene_surface_try_from_buffer(scene_buffer);
+		if (scene_surface != NULL) {
+			meta->is_subsurface =
+				!!wlr_subsurface_try_from_wlr_surface(scene_surface->surface);
+		}
+
+		// 绑定销毁回调监听，随包装节点销毁而释放内存
+		meta->destroy.notify = handle_snapshot_meta_destroy;
+		wl_signal_add(&wrapper->node.events.destroy, &meta->destroy);
+		wrapper->node.data = meta;
+
+		// 将真正的 buffer 挂靠在 wrapper 下面（相对坐标0,0）
+		struct wlr_scene_buffer *snapshot_buffer =
+			wlr_scene_buffer_create(wrapper, NULL);
+		if (snapshot_buffer == NULL) {
+			wlr_scene_node_destroy(&wrapper->node);
+			return false;
+		}
+
+		// 保留原生的 data 指针（如 Client*），防止事件派发/焦点获取失效
 		snapshot_buffer->node.data = scene_buffer->node.data;
 
 		wlr_scene_buffer_set_dest_size(snapshot_buffer, scene_buffer->dst_width,
@@ -179,16 +216,8 @@ static bool scene_node_snapshot(struct wlr_scene_node *node, int32_t lx,
 										   scene_buffer->corner_radius,
 										   scene_buffer->corners);
 
-		// wlr_scene_buffer_set_backdrop_blur_optimized(
-		// 	snapshot_buffer, scene_buffer->backdrop_blur_optimized);
-		// wlr_scene_buffer_set_backdrop_blur_ignore_transparent(
-		// 	snapshot_buffer, scene_buffer->backdrop_blur_ignore_transparent);
 		wlr_scene_buffer_set_backdrop_blur(snapshot_buffer, false);
 
-		snapshot_buffer->node.data = scene_buffer->node.data;
-
-		struct wlr_scene_surface *scene_surface =
-			wlr_scene_surface_try_from_buffer(scene_buffer);
 		if (scene_surface != NULL && scene_surface->surface->buffer != NULL) {
 			wlr_scene_buffer_set_buffer(snapshot_buffer,
 										&scene_surface->surface->buffer->base);

src/mango.c

@@ -606,6 +606,13 @@ struct TagScrollerState {
 	int count;
 };
 
+typedef struct {
+	int32_t orig_width;
+	int32_t orig_height;
+	bool is_subsurface;
+	struct wl_listener destroy;
+} SnapshotMetadata;
+
 /* function declarations */
 static void applybounds(
 	Client *c,