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var file = File.new()
file.open("user://screenshot-test.png", File.READ)
var buffer = file.get_buffer(file.get_len())
file.close()
var image = Image.new()
image.load_png_from_buffer(buffer)
var image_texture = ImageTexture.new()
image_texture.create_from_image(image)
sprite.texture = image_texture