extends Sprite2D

@export var export_dir = "res://asset/art/ui/inverted_point_light_masks/"
@export var frames = 24
@export var frame_texture_size = Vector2(1000, 600)


func _ready() -> void:
	if texture and export_dir:
		var image = texture.get_image()
		if image:
			if DirAccess.dir_exists_absolute(export_dir):
				DirAccess.remove_absolute(export_dir)
			DirAccess.make_dir_recursive_absolute(export_dir)
			for i in range(frames):
				var frame_image = Image.create_empty(
					frame_texture_size.x, frame_texture_size.y, false, Image.FORMAT_RGBA8
				)
				frame_image.fill(Color.WHITE)
				# 最后一张图片不需要处理，保持全白
				if i < frames - 1:
					var i_scale = cubic_interpolate(1.0, 0.0, 1.0, 0.0, float(i) / frames)
					var i_len = int(frame_texture_size.y * i_scale)
					image.resize(i_len, i_len, Image.INTERPOLATE_LANCZOS)
					var i_offset = (
						Vector2(frame_texture_size.x - i_len, frame_texture_size.y - i_len) * 0.5
					)
					for y in range(i_len):
						for x in range(i_len):
							var color = image.get_pixel(x, y)
							frame_image.set_pixel(
								x + i_offset.x, y + i_offset.y, Color(1.0, 1.0, 1.0, 1.0 - color.r)
							)
				var export_path = export_dir + str(i).pad_zeros(3) + ".png"
				frame_image.save_png(export_path)
				print("Exported to: " + export_path)
		else:
			print("No image found in texture")