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| hb_bool_t | hb_ot_var_has_data () | 
| hb_bool_t | hb_ot_var_find_axis_info () | 
| unsigned int | hb_ot_var_get_axis_count () | 
| unsigned int | hb_ot_var_get_axis_infos () | 
| unsigned int | hb_ot_var_get_named_instance_count () | 
| hb_ot_name_id_t | hb_ot_var_named_instance_get_subfamily_name_id () | 
| hb_ot_name_id_t | hb_ot_var_named_instance_get_postscript_name_id () | 
| unsigned int | hb_ot_var_named_instance_get_design_coords () | 
| void | hb_ot_var_normalize_variations () | 
| void | hb_ot_var_normalize_coords () | 
| #define | HB_OT_TAG_VAR_AXIS_ITALIC | 
| #define | HB_OT_TAG_VAR_AXIS_OPTICAL_SIZE | 
| #define | HB_OT_TAG_VAR_AXIS_SLANT | 
| #define | HB_OT_TAG_VAR_AXIS_WEIGHT | 
| #define | HB_OT_TAG_VAR_AXIS_WIDTH | 
| enum | hb_ot_var_axis_flags_t | 
| hb_ot_var_axis_info_t | 
hb_bool_t
hb_ot_var_has_data (hb_face_t *face);
Tests whether a face includes any OpenType variation data in the fvar table.
Since: 1.4.2
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);
Fetches the variation-axis information corresponding to the specified axis tag in the specified face.
| face | hb_face_t to work upon | |
| axis_tag | The hb_tag_t of the variation axis to query | |
| axis_info | The hb_ot_var_axis_info_t of the axis tag queried. | [out] | 
Since: 2.2.0
unsigned int
hb_ot_var_get_axis_count (hb_face_t *face);
Fetches the number of OpenType variation axes included in the face.
Since: 1.4.2
unsigned int hb_ot_var_get_axis_infos (hb_face_t *face,unsigned int start_offset,unsigned int *axes_count,hb_ot_var_axis_info_t *axes_array);
Fetches a list of all variation axes in the specified face. The list returned will begin at the offset provided.
| face | hb_face_t to work upon | |
| start_offset | offset of the first lookup to retrieve | |
| axes_count | Input = the maximum number of variation axes to return; Output = the actual number of variation axes returned (may be zero). | [inout][optional] | 
| axes_array | The array of variation axes found. | [out caller-allocates][array length=axes_count] | 
Since: 2.2.0
unsigned int
hb_ot_var_get_named_instance_count (hb_face_t *face);
Fetches the number of named instances included in the face.
Since: 2.2.0
hb_ot_name_id_t hb_ot_var_named_instance_get_subfamily_name_id (hb_face_t *face,unsigned int instance_index);
Fetches the name table Name ID that provides display names for
the "Subfamily name" defined for the given named instance in the face.
Since: 2.2.0
hb_ot_name_id_t hb_ot_var_named_instance_get_postscript_name_id (hb_face_t *face,unsigned int instance_index);
Fetches the name table Name ID that provides display names for
the "PostScript name" defined for the given named instance in the face.
Since: 2.2.0
unsigned int hb_ot_var_named_instance_get_design_coords (hb_face_t *face,unsigned int instance_index,unsigned int *coords_length,float *coords);
Fetches the design-space coordinates corresponding to the given named instance in the face.
| face | The hb_face_t to work on | |
| instance_index | The index of the named instance to query | |
| coords_length | Input = the maximum number of coordinates to return; Output = the actual number of coordinates returned (may be zero). | [inout][optional] | 
| coords | The array of coordinates found for the query. | [out][array length=coords_length] | 
Since: 2.2.0
void hb_ot_var_normalize_variations (hb_face_t *face,const hb_variation_t *variations,unsigned int variations_length,int *coords,unsigned int coords_length);
Normalizes all of the coordinates in the given list of variation axes.
| face | The hb_face_t to work on | |
| variations | The array of variations to normalize | |
| variations_length | The number of variations to normalize | |
| coords | The array of normalized coordinates. | [out][array length=coords_length] | 
| coords_length | The length of the coordinate array | 
Since: 1.4.2
void hb_ot_var_normalize_coords (hb_face_t *face,unsigned int coords_length,const float *design_coords,int *normalized_coords);
Normalizes the given design-space coordinates. The minimum and maximum values for the axis are mapped to the interval [-1,1], with the default axis value mapped to 0.
The normalized values have 14 bits of fixed-point sub-integer precision as per OpenType specification.
Any additional scaling defined in the face's avar table is also
applied, as described at https://docs.microsoft.com/en-us/typography/opentype/spec/avar
| face | The hb_face_t to work on | |
| coords_length | The length of the coordinate array | |
| design_coords | The design-space coordinates to normalize | |
| normalized_coords | The normalized coordinates. | [out] | 
Since: 1.4.2
#define HB_OT_TAG_VAR_AXIS_ITALIC HB_TAG('i','t','a','l')
Registered tag for the roman/italic axis.
#define HB_OT_TAG_VAR_AXIS_OPTICAL_SIZE HB_TAG('o','p','s','z')
Registered tag for the optical-size axis.
#define HB_OT_TAG_VAR_AXIS_SLANT HB_TAG('s','l','n','t')
Registered tag for the slant axis
#define HB_OT_TAG_VAR_AXIS_WEIGHT HB_TAG('w','g','h','t')
Registered tag for the weight axis.
#define HB_OT_TAG_VAR_AXIS_WIDTH HB_TAG('w','d','t','h')
Registered tag for the width axis.
typedef struct {
  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;
} hb_ot_var_axis_info_t;
Data type for holding variation-axis values.
The minimum, default, and maximum values are in un-normalized, user scales.
flags is
HB_OT_VAR_AXIS_FLAG_HIDDEN.| Index of the axis in the variation-axis array | ||
| hb_tag_t  | The hb_tag_t tag identifying the design variation of the axis | |
| hb_ot_name_id_t  | The  | |
| hb_ot_var_axis_flags_t  | The hb_ot_var_axis_flags_t flags for the axis | |
| The minimum value on the variation axis that the font covers | ||
| The position on the variation axis corresponding to the font's defaults | ||
| The maximum value on the variation axis that the font covers | 
Since: 2.2.0