Returns a font that can be used by pil image functions.
        This default font is "SourceSansVariable-Roman" that is available on all platforms.

def _get_font(self, size=8, name="PressStart2P.ttf"):
        """
        Returns a font that can be used by pil image functions.
        This default font is "SourceSansVariable-Roman" that is available on all platforms.
        """
        import kervi.vision as vision
        from PIL import ImageFont
        vision_path = os.path.dirname(vision.__file__)
        fontpath = os.path.join(vision_path, "fonts", name)
        font = ImageFont.truetype(fontpath, size)
        return font