#ifndef LAYER_H_
#define LAYER_H_
+#include "undo_history.h"
+
typedef enum {
LAYER_RECT,
LAYER_POINT,
} LayerPtr;
typedef struct Camera Camera;
-typedef struct UndoHistory UndoHistory;
int layer_render(LayerPtr layer, Camera *camera, int active);
int layer_event(LayerPtr layer,