preDraw(renderer) {
		// save the context
		renderer.save();

		// apply the defined alpha value
		renderer.setGlobalAlpha(renderer.globalAlpha() * this.getOpacity());

		// apply the defined tint, if any
		renderer.setTint(this.tint);

		// apply blending if different from "normal"
		if (this.blendMode !== renderer.getBlendMode()) {
			renderer.setBlendMode(this.blendMode);
		}
	}
override the default predraw function
as repeat and anchor are managed directly in the draw method
@ignore