fn apply_specular_lighting(
fe: &SpecularLighting,
region: IntRect,
cs: ColorInterpolation,
ts: Transform,
input: Image,
) -> Result<Image, Error>fn apply_specular_lighting(
fe: &SpecularLighting,
region: IntRect,
cs: ColorInterpolation,
ts: Transform,
input: Image,
) -> Result<Image, Error>