hb_ot_var_has_data ()

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_ot_var_find_axis_info ()

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.

Since: 2.2.0

hb_ot_var_get_axis_count ()

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

hb_ot_var_get_axis_infos ()

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.

Since: 2.2.0

hb_ot_var_get_named_instance_count ()

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_var_named_instance_get_subfamily_name_id ()

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_var_named_instance_get_postscript_name_id ()

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

hb_ot_var_named_instance_get_design_coords ()

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.

Since: 2.2.0

hb_ot_var_normalize_variations ()

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.

Since: 1.4.2

hb_ot_var_normalize_coords ()

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.

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

Since: 1.4.2

HB_OT_TAG_VAR_AXIS_ITALIC

#define HB_OT_TAG_VAR_AXIS_ITALIC HB_TAG('i','t','a','l')

HB_OT_TAG_VAR_AXIS_OPTICAL_SIZE

#define HB_OT_TAG_VAR_AXIS_OPTICAL_SIZE HB_TAG('o','p','s','z')

HB_OT_TAG_VAR_AXIS_SLANT

#define HB_OT_TAG_VAR_AXIS_SLANT HB_TAG('s','l','n','t')

HB_OT_TAG_VAR_AXIS_WEIGHT

#define HB_OT_TAG_VAR_AXIS_WEIGHT HB_TAG('w','g','h','t')

HB_OT_TAG_VAR_AXIS_WIDTH

#define HB_OT_TAG_VAR_AXIS_WIDTH HB_TAG('w','d','t','h')

enum hb_ot_var_axis_flags_t

Since: 2.2.0

hb_ot_var_axis_info_t

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.

Since: 2.2.0