#ifndef _MYSTNB_ANIMATION_H
#define _MYSTNB_ANIMATION_H

#include <gint/display.h>

struct anim_data;

/* anim_function_t: Update function for each animation */
typedef int (anim_function_t)(struct anim_data *data, int init);

anim_function_t anim_player_idle;
anim_function_t anim_player_walking;

anim_function_t anim_tile_start;
anim_function_t anim_tile_end;
anim_function_t anim_door_closed;
anim_function_t anim_door_opening;
anim_function_t anim_door_open;
anim_function_t anim_door_closing;

/* struct anim_frame: Subrectangle of an animation sheet */
struct anim_frame
{
	bopti_image_t *source;
	int left, top;
	int w, h;
};

/* struct anim_data: Data for currently-running animations */
struct anim_data
{
	/* Animation update function */
	anim_function_t *function;
	/* Frame to draw */
	struct anim_frame img;
	/* On-screen entity displacement */
	int dx, dy;
	/* Animation direction */
	int dir;
	/* Current frame */
	int frame;
	/* Duration left until next frame; updated by the engine. Animation
	   function is called when it becomes negative or null */
	int duration;
};

/* Draw an animation frame */
void dframe(int x, int y, struct anim_frame const frame);

#endif /* _MYSTNB_ANIMATION_H */