hb_ot_math_has_data ()

hb_bool_t
hb_ot_math_has_data (hb_face_t *face);

Tests whether a face has a MATH table.

Since: 1.3.3

hb_ot_math_get_constant ()

hb_position_t
hb_ot_math_get_constant (hb_font_t *font,
                         hb_ot_math_constant_t constant);

Fetches the specified math constant. For most constants, the value returned is an hb_position_t.

However, if the requested constant is HB_OT_MATH_CONSTANT_SCRIPT_PERCENT_SCALE_DOWN, HB_OT_MATH_CONSTANT_SCRIPT_SCRIPT_PERCENT_SCALE_DOWN or HB_OT_MATH_CONSTANT_RADICAL_DEGREE_BOTTOM_RAISE_PERCENT, then the return value is an integer between 0 and 100 representing that percentage.

Since: 1.3.3

hb_ot_math_get_glyph_italics_correction ()

hb_position_t
hb_ot_math_get_glyph_italics_correction
                               (hb_font_t *font,
                                hb_codepoint_t glyph);

Fetches an italics-correction value (if one exists) for the specified glyph index.

Since: 1.3.3

hb_ot_math_get_glyph_top_accent_attachment ()

hb_position_t
hb_ot_math_get_glyph_top_accent_attachment
                               (hb_font_t *font,
                                hb_codepoint_t glyph);

Fetches a top-accent-attachment value (if one exists) for the specified glyph index.

For any glyph that does not have a top-accent-attachment value - that is, a glyph not covered by the MathTopAccentAttachment table (or, when font has no MathTopAccentAttachment table or no MATH table, any glyph) - the function synthesizes a value, returning the position at one-half the glyph's advance width.

Since: 1.3.3

hb_ot_math_get_glyph_kerning ()

hb_position_t
hb_ot_math_get_glyph_kerning (hb_font_t *font,
                              hb_codepoint_t glyph,
                              hb_ot_math_kern_t kern,
                              hb_position_t correction_height);

Fetches the math kerning (cut-ins) value for the specified font, glyph index, and kern .

If the MathKern table is found, the function examines it to find a height value that is greater or equal to correction_height . If such a height value is found, corresponding kerning value from the table is returned. If no such height value is found, the last kerning value is returned.

Since: 1.3.3

hb_ot_math_get_glyph_kernings ()

unsigned int
hb_ot_math_get_glyph_kernings (hb_font_t *font,
                               hb_codepoint_t glyph,
                               hb_ot_math_kern_t kern,
                               unsigned int start_offset,
                               unsigned int *entries_count,
                               hb_ot_math_kern_entry_t *kern_entries);

Fetches the raw MathKern (cut-in) data for the specified font, glyph index, and kern . The corresponding list of kern values and correction heights is returned as a list of hb_ot_math_kern_entry_t structs.

See also hb_ot_math_get_glyph_kerning, which handles selecting the appropriate kern value for a given correction height.

Since: 3.4.0

hb_ot_math_is_glyph_extended_shape ()

hb_bool_t
hb_ot_math_is_glyph_extended_shape (hb_face_t *face,
                                    hb_codepoint_t glyph);

Tests whether the given glyph index is an extended shape in the face.

Since: 1.3.3

hb_ot_math_get_glyph_variants ()

unsigned int
hb_ot_math_get_glyph_variants (hb_font_t *font,
                               hb_codepoint_t glyph,
                               hb_direction_t direction,
                               unsigned int start_offset,
                               unsigned int *variants_count,
                               hb_ot_math_glyph_variant_t *variants);

Fetches the MathGlyphConstruction for the specified font, glyph index, and direction. The corresponding list of size variants is returned as a list of hb_ot_math_glyph_variant_t structs.

Since: 1.3.3

hb_ot_math_get_min_connector_overlap ()

hb_position_t
hb_ot_math_get_min_connector_overlap (hb_font_t *font,
                                      hb_direction_t direction);

Fetches the MathVariants table for the specified font and returns the minimum overlap of connecting glyphs that are required to draw a glyph assembly in the specified direction.

Since: 1.3.3

hb_ot_math_get_glyph_assembly ()

unsigned int
hb_ot_math_get_glyph_assembly (hb_font_t *font,
                               hb_codepoint_t glyph,
                               hb_direction_t direction,
                               unsigned int start_offset,
                               unsigned int *parts_count,
                               hb_ot_math_glyph_part_t *parts,
                               hb_position_t *italics_correction);

Fetches the GlyphAssembly for the specified font, glyph index, and direction. Returned are a list of hb_ot_math_glyph_part_t glyph parts that can be used to draw the glyph and an italics-correction value (if one is defined in the font).

Since: 1.3.3

HB_OT_TAG_MATH

#define HB_OT_TAG_MATH HB_TAG('M','A','T','H')

OpenType Mathematical Typesetting Table.

Since: 1.3.3

HB_OT_TAG_MATH_SCRIPT

#define HB_OT_TAG_MATH_SCRIPT HB_TAG('m','a','t','h')

OpenType script tag, math, for features specific to math shaping.

Since: 3.4.0

enum hb_ot_math_constant_t

The 'MATH' table constants, refer to OpenType documentation For more explanations.

Since: 1.3.3

enum hb_ot_math_kern_t

The math kerning-table types defined for the four corners of a glyph.

Since: 1.3.3

hb_ot_math_kern_entry_t

typedef struct {
  hb_position_t max_correction_height;
  hb_position_t kern_value;
} hb_ot_math_kern_entry_t;

Data type to hold math kerning (cut-in) information for a glyph.

Since: 3.4.0

hb_ot_math_glyph_variant_t

typedef struct {
  hb_codepoint_t glyph;
  hb_position_t advance;
} hb_ot_math_glyph_variant_t;

Data type to hold math-variant information for a glyph.

Since: 1.3.3

enum hb_ot_math_glyph_part_flags_t

Flags for math glyph parts.

Since: 1.3.3

hb_ot_math_glyph_part_t

typedef struct {
  hb_codepoint_t glyph;
  hb_position_t start_connector_length;
  hb_position_t end_connector_length;
  hb_position_t full_advance;
  hb_ot_math_glyph_part_flags_t flags;
} hb_ot_math_glyph_part_t;

Data type to hold information for a "part" component of a math-variant glyph. Large variants for stretchable math glyphs (such as parentheses) can be constructed on the fly from parts.

Since: 1.3.3