core: 窗口分层类型与接口草案

src/core/layer.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <stddef.h>
+
+#include "core/types.h"
+#include "core/window.h"
+
+/* 层级从低到高 */
+typedef enum layer_type_t {
+  ZDWM_WINDOW_LAYER_DESKTOP = 0,
+  ZDWM_WINDOW_LAYER_NORMAL,
+  ZDWM_WINDOW_LAYER_TOP,
+  ZDWM_WINDOW_LAYER_OVERLAY,
+  ZDWM_WINDOW_LAYER_COUNT,
+} layer_type_t;
+
+typedef struct layer_stack_t {
+  window_id_t *order;
+  size_t count;
+  size_t capacity;
+} layer_stack_t;
+
+void layer_stack_init(layer_stack_t *layer);
+void layer_stack_reset(layer_stack_t *layer);
+void layer_stack_append(layer_stack_t *layer, window_id_t window);
+void layer_stack_remove(layer_stack_t *layer, window_id_t window);
+void layer_stack_raise(layer_stack_t *layer, window_id_t window);
+void layer_stack_lower(layer_stack_t *layer, window_id_t window);
+
+layer_type_t layer_classify(const window_props_t *props);