def save_otfs(
        self,
        ufos,
        ttf=False,
        is_instance=False,
        interpolatable=False,
        use_afdko=False,
        autohint=None,
        subset=None,
        use_production_names=None,
        subroutinize=None,  # deprecated
        optimize_cff=CFFOptimization.NONE,
        cff_round_tolerance=None,
        remove_overlaps=True,
        overlaps_backend=None,
        reverse_direction=True,
        conversion_error=None,
        feature_writers=None,
        interpolate_layout_from=None,
        interpolate_layout_dir=None,
        output_path=None,
        output_dir=None,
        inplace=True,
    ):
        """Build OpenType binaries from UFOs.

        Args:
            ufos: Font objects to compile.
            ttf: If True, build fonts with TrueType outlines and .ttf extension.
            is_instance: If output fonts are instances, for generating paths.
            interpolatable: If output is interpolatable, for generating paths.
            use_afdko: If True, use AFDKO to compile feature source.
            autohint: Parameters to provide to ttfautohint. If not provided, the
                autohinting step is skipped.
            subset: Whether to subset the output according to data in the UFOs.
                If not provided, also determined by flags in the UFOs.
            use_production_names: Whether to use production glyph names in the
                output. If not provided, determined by flags in the UFOs.
            subroutinize: If True, subroutinize CFF outlines in output.
            cff_round_tolerance (float): controls the rounding of point
                coordinates in CFF table. It is defined as the maximum absolute
                difference between the original float and the rounded integer
                value. By default, all floats are rounded to integer (tolerance
                0.5); a value of 0 completely disables rounding; values in
                between only round floats which are close to their integral
                part within the tolerated range. Ignored if ttf=True.
            remove_overlaps: If True, remove overlaps in glyph shapes.
            overlaps_backend: name of the library to remove overlaps. Can be
                either "booleanOperations" (default) or "pathops".
            reverse_direction: If True, reverse contour directions when
                compiling TrueType outlines.
            conversion_error: Error to allow when converting cubic CFF contours
                to quadratic TrueType contours.
            feature_writers: list of ufo2ft-compatible feature writer classes
                or pre-initialized objects that are passed on to ufo2ft
                feature compiler to generate automatic feature code. The
                default value (None) means that ufo2ft will use its built-in
                default feature writers (for kern, mark, mkmk, etc.). An empty
                list ([]) will skip any automatic feature generation.
            interpolate_layout_from: A DesignSpaceDocument object to give varLib
                for interpolating layout tables to use in output.
            interpolate_layout_dir: Directory containing the compiled master
                fonts to use for interpolating binary layout tables.
            output_path: output font file path. Only works when the input
                'ufos' list contains a single font.
            output_dir: directory where to save output files. Mutually
                exclusive with 'output_path' argument.
        """
        assert not (output_path and output_dir), "mutually exclusive args"

        if output_path is not None and len(ufos) > 1:
            raise ValueError("output_path requires a single input")

        if subroutinize is not None:
            import warnings

            warnings.warn(
                "the 'subroutinize' argument is deprecated, use 'optimize_cff'",
                UserWarning,
            )
            if subroutinize:
                optimize_cff = CFFOptimization.SUBROUTINIZE
            else:
                # for b/w compatibility, we still run the charstring specializer
                # even when --no-subroutinize is used. Use the new --optimize-cff
                # option to disable both specilization and subroutinization
                optimize_cff = CFFOptimization.SPECIALIZE

        ext = "ttf" if ttf else "otf"

        if interpolate_layout_from is not None:
            if interpolate_layout_dir is None:
                interpolate_layout_dir = self._output_dir(
                    ext, is_instance=False, interpolatable=interpolatable
                )
            finder = partial(_varLib_finder, directory=interpolate_layout_dir, ext=ext)
            # no need to generate automatic features in ufo2ft, since here we
            # are interpolating precompiled GPOS table with fontTools.varLib.
            # An empty 'featureWriters' list tells ufo2ft to not generate any
            # automatic features.
            # TODO: Add an argument to ufo2ft.compileOTF/compileTTF to
            # completely skip compiling features into OTL tables
            feature_writers = []

        compiler_options = dict(
            useProductionNames=use_production_names,
            reverseDirection=reverse_direction,
            cubicConversionError=conversion_error,
            featureWriters=feature_writers,
            inplace=True,  # avoid extra copy
        )
        if use_afdko:
            compiler_options["featureCompilerClass"] = FDKFeatureCompiler

        if interpolatable:
            if not ttf:
                raise NotImplementedError("interpolatable CFF not supported yet")

            logger.info("Building interpolation-compatible TTFs")

            fonts = ufo2ft.compileInterpolatableTTFs(ufos, **compiler_options)
        else:
            fonts = self._iter_compile(
                ufos,
                ttf,
                removeOverlaps=remove_overlaps,
                overlapsBackend=overlaps_backend,
                optimizeCFF=optimize_cff,
                roundTolerance=cff_round_tolerance,
                **compiler_options
            )

        do_autohint = ttf and autohint is not None

        for font, ufo in zip(fonts, ufos):

            if interpolate_layout_from is not None:
                master_locations, instance_locations = self._designspace_locations(
                    interpolate_layout_from
                )
                loc = instance_locations[_normpath(ufo.path)]
                gpos_src = interpolate_layout(
                    interpolate_layout_from, loc, finder, mapped=True
                )
                font["GPOS"] = gpos_src["GPOS"]
                gsub_src = TTFont(finder(self._closest_location(master_locations, loc)))
                if "GDEF" in gsub_src:
                    font["GDEF"] = gsub_src["GDEF"]
                if "GSUB" in gsub_src:
                    font["GSUB"] = gsub_src["GSUB"]

            if do_autohint:
                # if we are autohinting, we save the unhinted font to a
                # temporary path, and the hinted one to the final destination
                fd, otf_path = tempfile.mkstemp("." + ext)
                os.close(fd)
            elif output_path is None:
                otf_path = self._output_path(
                    ufo, ext, is_instance, interpolatable, output_dir=output_dir
                )
            else:
                otf_path = output_path

            logger.info("Saving %s", otf_path)
            font.save(otf_path)

            # 'subset' is an Optional[bool], can be None, True or False.
            # When False, we never subset; when True, we always do; when
            # None (default), we check the presence of custom parameters
            if subset is False:
                pass
            elif subset is True or (
                (KEEP_GLYPHS_OLD_KEY in ufo.lib or KEEP_GLYPHS_NEW_KEY in ufo.lib)
                or any(glyph.lib.get(GLYPH_EXPORT_KEY, True) is False for glyph in ufo)
            ):
                self.subset_otf_from_ufo(otf_path, ufo)

            if not do_autohint:
                continue

            if output_path is not None:
                hinted_otf_path = output_path
            else:
                hinted_otf_path = self._output_path(
                    ufo,
                    ext,
                    is_instance,
                    interpolatable,
                    autohinted=True,
                    output_dir=output_dir,
                )
            try:
                ttfautohint(otf_path, hinted_otf_path, args=autohint)
            except TTFAError:
                # copy unhinted font to destination before re-raising error
                shutil.copyfile(otf_path, hinted_otf_path)
                raise
            finally:
                # must clean up temp file
                os.remove(otf_path)
Build OpenType binaries from UFOs.

        Args:
            ufos: Font objects to compile.
            ttf: If True, build fonts with TrueType outlines and .ttf extension.
            is_instance: If output fonts are instances, for generating paths.
            interpolatable: If output is interpolatable, for generating paths.
            use_afdko: If True, use AFDKO to compile feature source.
            autohint: Parameters to provide to ttfautohint. If not provided, the
                autohinting step is skipped.
            subset: Whether to subset the output according to data in the UFOs.
                If not provided, also determined by flags in the UFOs.
            use_production_names: Whether to use production glyph names in the
                output. If not provided, determined by flags in the UFOs.
            subroutinize: If True, subroutinize CFF outlines in output.
            cff_round_tolerance (float): controls the rounding of point
                coordinates in CFF table. It is defined as the maximum absolute
                difference between the original float and the rounded integer
                value. By default, all floats are rounded to integer (tolerance
                0.5); a value of 0 completely disables rounding; values in
                between only round floats which are close to their integral
                part within the tolerated range. Ignored if ttf=True.
            remove_overlaps: If True, remove overlaps in glyph shapes.
            overlaps_backend: name of the library to remove overlaps. Can be
                either "booleanOperations" (default) or "pathops".
            reverse_direction: If True, reverse contour directions when
                compiling TrueType outlines.
            conversion_error: Error to allow when converting cubic CFF contours
                to quadratic TrueType contours.
            feature_writers: list of ufo2ft-compatible feature writer classes
                or pre-initialized objects that are passed on to ufo2ft
                feature compiler to generate automatic feature code. The
                default value (None) means that ufo2ft will use its built-in
                default feature writers (for kern, mark, mkmk, etc.). An empty
                list ([]) will skip any automatic feature generation.
            interpolate_layout_from: A DesignSpaceDocument object to give varLib
                for interpolating layout tables to use in output.
            interpolate_layout_dir: Directory containing the compiled master
                fonts to use for interpolating binary layout tables.
            output_path: output font file path. Only works when the input
                'ufos' list contains a single font.
            output_dir: directory where to save output files. Mutually
                exclusive with 'output_path' argument.