Relevant camera code

CustomCamera.gd

onready var screen_size = get_viewport_rect().size;
onready var screen_offset = screen_size * 0.5;

func adjust_scale(new_scale : Vector2):

	scale = new_scale;
	scale_inv = Vector2.ONE / scale;

	create_camera_tranform();

	# this is to force the camera to stay inside the level bounds
	update_inner_limits(level);

	# if room is not null this will force the camera to stay inside a specified rect
	update_inner_limits(room);
	pass;

func create_camera_tranform():

	var t = Transform2D(rotation, position);
	t.x *= scale.x;
	t.y *= scale.y;
	camera_transform = t;

func _physics_process(delta):

	match camera_state:

		CameraStates.FOLLOW_TARGET:
			update_follow_target(delta);

		CameraStates.TWEEN_CUTSCENE:
			update_tween_cutscene(delta);
	
	# actually moves camera
	camera_transform.origin = -position * scale + screen_offset;
	get_viewport().set_canvas_transform(camera_transform);
	
	# in order to draw debug shapes
	# update();
	pass;