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+/*
+ * Copyright © 2017 Google, Inc.
+ *
+ * This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ */
+
+#if !defined(HB_OT_H_IN) && !defined(HB_NO_SINGLE_HEADER_ERROR)
+#error "Include <hb-ot.h> instead."
+#endif
+
+#ifndef HB_OT_VAR_H
+#define HB_OT_VAR_H
+
+#include "hb.h"
+
+HB_BEGIN_DECLS
+
+/**
+ * HB_OT_TAG_VAR_AXIS_ITALIC:
+ *
+ * Registered tag for the roman/italic axis.
+ */
+#define HB_OT_TAG_VAR_AXIS_ITALIC HB_TAG('i','t','a','l')
+
+/**
+ * HB_OT_TAG_VAR_AXIS_OPTICAL_SIZE:
+ *
+ * Registered tag for the optical-size axis.
+ * <note>Note: The optical-size axis supersedes the OpenType `size` feature.</note>
+ */
+#define HB_OT_TAG_VAR_AXIS_OPTICAL_SIZE HB_TAG('o','p','s','z')
+
+/**
+ * HB_OT_TAG_VAR_AXIS_SLANT:
+ *
+ * Registered tag for the slant axis
+ */
+#define HB_OT_TAG_VAR_AXIS_SLANT HB_TAG('s','l','n','t')
+
+/**
+ * HB_OT_TAG_VAR_AXIS_WIDTH:
+ *
+ * Registered tag for the width axis.
+ */
+#define HB_OT_TAG_VAR_AXIS_WIDTH HB_TAG('w','d','t','h')
+
+/**
+ * HB_OT_TAG_VAR_AXIS_WEIGHT:
+ *
+ * Registered tag for the weight axis.
+ */
+#define HB_OT_TAG_VAR_AXIS_WEIGHT HB_TAG('w','g','h','t')
+
+
+/*
+ * fvar / avar
+ */
+
+HB_EXTERN hb_bool_t
+hb_ot_var_has_data (hb_face_t *face);
+
+
+/*
+ * Variation axes.
+ */
+
+
+HB_EXTERN unsigned int
+hb_ot_var_get_axis_count (hb_face_t *face);
+
+/**
+ * hb_ot_var_axis_flags_t:
+ * @HB_OT_VAR_AXIS_FLAG_HIDDEN: The axis should not be exposed directly in user interfaces.
+ *
+ * Flags for #hb_ot_var_axis_info_t.
+ *
+ * Since: 2.2.0
+ */
+typedef enum { /*< flags >*/
+ HB_OT_VAR_AXIS_FLAG_HIDDEN = 0x00000001u,
+
+ /*< private >*/
+ _HB_OT_VAR_AXIS_FLAG_MAX_VALUE= HB_TAG_MAX_SIGNED /*< skip >*/
+} hb_ot_var_axis_flags_t;
+
+/**
+ * hb_ot_var_axis_info_t:
+ * @axis_index: Index of the axis in the variation-axis array
+ * @tag: The #hb_tag_t tag identifying the design variation of the axis
+ * @name_id: The `name` table Name ID that provides display names for the axis
+ * @flags: The #hb_ot_var_axis_flags_t flags for the axis
+ * @min_value: The minimum value on the variation axis that the font covers
+ * @default_value: The position on the variation axis corresponding to the font's defaults
+ * @max_value: The maximum value on the variation axis that the font covers
+ *
+ * Data type for holding variation-axis values.
+ *
+ * The minimum, default, and maximum values are in un-normalized, user scales.
+ *
+ * <note>Note: at present, the only flag defined for @flags is
+ * #HB_OT_VAR_AXIS_FLAG_HIDDEN.</note>
+ *
+ * Since: 2.2.0
+ */
+typedef struct hb_ot_var_axis_info_t {
+ unsigned int axis_index;
+ hb_tag_t tag;
+ hb_ot_name_id_t name_id;
+ hb_ot_var_axis_flags_t flags;
+ float min_value;
+ float default_value;
+ float max_value;
+ /*< private >*/
+ unsigned int reserved;
+} hb_ot_var_axis_info_t;
+
+HB_EXTERN unsigned int
+hb_ot_var_get_axis_infos (hb_face_t *face,
+ unsigned int start_offset,
+ unsigned int *axes_count /* IN/OUT */,
+ hb_ot_var_axis_info_t *axes_array /* OUT */);
+
+HB_EXTERN hb_bool_t
+hb_ot_var_find_axis_info (hb_face_t *face,
+ hb_tag_t axis_tag,
+ hb_ot_var_axis_info_t *axis_info);
+
+
+/*
+ * Named instances.
+ */
+
+HB_EXTERN unsigned int
+hb_ot_var_get_named_instance_count (hb_face_t *face);
+
+HB_EXTERN hb_ot_name_id_t
+hb_ot_var_named_instance_get_subfamily_name_id (hb_face_t *face,
+ unsigned int instance_index);
+
+HB_EXTERN hb_ot_name_id_t
+hb_ot_var_named_instance_get_postscript_name_id (hb_face_t *face,
+ unsigned int instance_index);
+
+HB_EXTERN unsigned int
+hb_ot_var_named_instance_get_design_coords (hb_face_t *face,
+ unsigned int instance_index,
+ unsigned int *coords_length, /* IN/OUT */
+ float *coords /* OUT */);
+
+
+/*
+ * Conversions.
+ */
+
+HB_EXTERN void
+hb_ot_var_normalize_variations (hb_face_t *face,
+ const hb_variation_t *variations, /* IN */
+ unsigned int variations_length,
+ int *coords, /* OUT */
+ unsigned int coords_length);
+
+HB_EXTERN void
+hb_ot_var_normalize_coords (hb_face_t *face,
+ unsigned int coords_length,
+ const float *design_coords, /* IN */
+ int *normalized_coords /* OUT */);
+
+
+HB_END_DECLS
+
+#endif /* HB_OT_VAR_H */