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hb-ot-math

hb-ot-math

Description

Functions

hb_ot_math_has_data ()

hb_bool_t
hb_ot_math_has_data (hb_face_t *face);

This function allows to verify the presence of an OpenType MATH table on the face.

Parameters

face

hb_face_t to test

 

Returns

true if face has a MATH table, false otherwise

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);

This function returns the requested math constants as a hb_position_t. If the request constant is HB_OT_MATH_CONSTANT_SCRIPT_PERCENT_SCALE_DOWN, HB_OT_MATH_CONSTANT_SCRIPT_SCRIPT_PERCENT_SCALE_DOWN or HB_OT_MATH_CONSTANT_SCRIPT_PERCENT_SCALE_DOWN then the return value is actually an integer between 0 and 100 representing that percentage.

Parameters

font

hb_font_t from which to retrieve the value

 

constant

hb_ot_math_constant_t the constant to retrieve

 

Returns

the requested constant or 0

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);

Parameters

font

hb_font_t from which to retrieve the value

 

glyph

glyph index from which to retrieve the value

 

Returns

the italics correction of the glyph or 0

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);

Parameters

font

hb_font_t from which to retrieve the value

 

glyph

glyph index from which to retrieve the value

 

Returns

the top accent attachment of the glyph or 0

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);

This function tries to retrieve the MathKern table for the specified font, glyph and hb_ot_math_kern_t. Then it browses the list of heights from the MathKern table to find one value that is greater or equal to specified correction_height. If one is found the corresponding value from the list of kerns is returned and otherwise the last kern value is returned.

Parameters

font

hb_font_t from which to retrieve the value

 

glyph

glyph index from which to retrieve the value

 

kern

the hb_ot_math_kern_t from which to retrieve the value

 

correction_height

the correction height to use to determine the kerning.

 

Returns

requested kerning or 0

Since: 1.3.3


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);

Parameters

face

a hb_face_t to test

 

glyph

a glyph index to test

 

Returns

true if the glyph is an extended shape, false otherwise

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);

This function tries to retrieve the MathGlyphConstruction for the specified font, glyph and direction. Note that only the value of HB_DIRECTION_IS_HORIZONTAL is considered. It provides the corresponding list of size variants as an array of hb_ot_math_glyph_variant_t structs.

Parameters

font

hb_font_t from which to retrieve the values

 

glyph

index of the glyph to stretch

 

direction

direction of the stretching

 

start_offset

offset of the first variant to retrieve

 

variants_count

maximum number of variants to retrieve after start_offset (IN) and actual number of variants retrieved (OUT)

 

variants

array of size at least variants_count to store the result

 

Returns

the total number of size variants available or 0

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);

This function tries to retrieve the MathVariants table for the specified font and returns the minimum overlap of connecting glyphs to draw a glyph assembly in the specified direction. Note that only the value of HB_DIRECTION_IS_HORIZONTAL is considered.

Parameters

font

hb_font_t from which to retrieve the value

 

direction

direction of the stretching

 

Returns

requested min connector overlap or 0

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);

This function tries to retrieve the GlyphAssembly for the specified font, glyph and direction. Note that only the value of HB_DIRECTION_IS_HORIZONTAL is considered. It provides the information necessary to draw the glyph assembly as an array of hb_ot_math_glyph_part_t.

Parameters

font

hb_font_t from which to retrieve the values

 

glyph

index of the glyph to stretch

 

direction

direction of the stretching

 

start_offset

offset of the first glyph part to retrieve

 

parts_count

maximum number of glyph parts to retrieve after start_offset (IN) and actual number of parts retrieved (OUT)

 

parts

array of size at least parts_count to store the result

 

italics_correction

italic correction of the glyph assembly

 

Returns

the total number of parts in the glyph assembly

Since: 1.3.3

Types and Values

HB_OT_TAG_MATH

#define             HB_OT_TAG_MATH

HB_OT_MATH_SCRIPT

#define             HB_OT_MATH_SCRIPT

enum hb_ot_math_constant_t

Members

HB_OT_MATH_CONSTANT_SCRIPT_PERCENT_SCALE_DOWN

   

HB_OT_MATH_CONSTANT_SCRIPT_SCRIPT_PERCENT_SCALE_DOWN

   

HB_OT_MATH_CONSTANT_DELIMITED_SUB_FORMULA_MIN_HEIGHT

   

HB_OT_MATH_CONSTANT_DISPLAY_OPERATOR_MIN_HEIGHT

   

HB_OT_MATH_CONSTANT_MATH_LEADING

   

HB_OT_MATH_CONSTANT_AXIS_HEIGHT

   

HB_OT_MATH_CONSTANT_ACCENT_BASE_HEIGHT

   

HB_OT_MATH_CONSTANT_FLATTENED_ACCENT_BASE_HEIGHT

   

HB_OT_MATH_CONSTANT_SUBSCRIPT_SHIFT_DOWN

   

HB_OT_MATH_CONSTANT_SUBSCRIPT_TOP_MAX

   

HB_OT_MATH_CONSTANT_SUBSCRIPT_BASELINE_DROP_MIN

   

HB_OT_MATH_CONSTANT_SUPERSCRIPT_SHIFT_UP

   

HB_OT_MATH_CONSTANT_SUPERSCRIPT_SHIFT_UP_CRAMPED

   

HB_OT_MATH_CONSTANT_SUPERSCRIPT_BOTTOM_MIN

   

HB_OT_MATH_CONSTANT_SUPERSCRIPT_BASELINE_DROP_MAX

   

HB_OT_MATH_CONSTANT_SUB_SUPERSCRIPT_GAP_MIN

   

HB_OT_MATH_CONSTANT_SUPERSCRIPT_BOTTOM_MAX_WITH_SUBSCRIPT

   

HB_OT_MATH_CONSTANT_SPACE_AFTER_SCRIPT

   

HB_OT_MATH_CONSTANT_UPPER_LIMIT_GAP_MIN

   

HB_OT_MATH_CONSTANT_UPPER_LIMIT_BASELINE_RISE_MIN

   

HB_OT_MATH_CONSTANT_LOWER_LIMIT_GAP_MIN

   

HB_OT_MATH_CONSTANT_LOWER_LIMIT_BASELINE_DROP_MIN

   

HB_OT_MATH_CONSTANT_STACK_TOP_SHIFT_UP

   

HB_OT_MATH_CONSTANT_STACK_TOP_DISPLAY_STYLE_SHIFT_UP

   

HB_OT_MATH_CONSTANT_STACK_BOTTOM_SHIFT_DOWN

   

HB_OT_MATH_CONSTANT_STACK_BOTTOM_DISPLAY_STYLE_SHIFT_DOWN

   

HB_OT_MATH_CONSTANT_STACK_GAP_MIN

   

HB_OT_MATH_CONSTANT_STACK_DISPLAY_STYLE_GAP_MIN

   

HB_OT_MATH_CONSTANT_STRETCH_STACK_TOP_SHIFT_UP

   

HB_OT_MATH_CONSTANT_STRETCH_STACK_BOTTOM_SHIFT_DOWN

   

HB_OT_MATH_CONSTANT_STRETCH_STACK_GAP_ABOVE_MIN

   

HB_OT_MATH_CONSTANT_STRETCH_STACK_GAP_BELOW_MIN

   

HB_OT_MATH_CONSTANT_FRACTION_NUMERATOR_SHIFT_UP

   

HB_OT_MATH_CONSTANT_FRACTION_NUMERATOR_DISPLAY_STYLE_SHIFT_UP

   

HB_OT_MATH_CONSTANT_FRACTION_DENOMINATOR_SHIFT_DOWN

   

HB_OT_MATH_CONSTANT_FRACTION_DENOMINATOR_DISPLAY_STYLE_SHIFT_DOWN

   

HB_OT_MATH_CONSTANT_FRACTION_NUMERATOR_GAP_MIN

   

HB_OT_MATH_CONSTANT_FRACTION_NUM_DISPLAY_STYLE_GAP_MIN

   

HB_OT_MATH_CONSTANT_FRACTION_RULE_THICKNESS

   

HB_OT_MATH_CONSTANT_FRACTION_DENOMINATOR_GAP_MIN

   

HB_OT_MATH_CONSTANT_FRACTION_DENOM_DISPLAY_STYLE_GAP_MIN

   

HB_OT_MATH_CONSTANT_SKEWED_FRACTION_HORIZONTAL_GAP

   

HB_OT_MATH_CONSTANT_SKEWED_FRACTION_VERTICAL_GAP

   

HB_OT_MATH_CONSTANT_OVERBAR_VERTICAL_GAP

   

HB_OT_MATH_CONSTANT_OVERBAR_RULE_THICKNESS

   

HB_OT_MATH_CONSTANT_OVERBAR_EXTRA_ASCENDER

   

HB_OT_MATH_CONSTANT_UNDERBAR_VERTICAL_GAP

   

HB_OT_MATH_CONSTANT_UNDERBAR_RULE_THICKNESS

   

HB_OT_MATH_CONSTANT_UNDERBAR_EXTRA_DESCENDER

   

HB_OT_MATH_CONSTANT_RADICAL_VERTICAL_GAP

   

HB_OT_MATH_CONSTANT_RADICAL_DISPLAY_STYLE_VERTICAL_GAP

   

HB_OT_MATH_CONSTANT_RADICAL_RULE_THICKNESS

   

HB_OT_MATH_CONSTANT_RADICAL_EXTRA_ASCENDER

   

HB_OT_MATH_CONSTANT_RADICAL_KERN_BEFORE_DEGREE

   

HB_OT_MATH_CONSTANT_RADICAL_KERN_AFTER_DEGREE

   

HB_OT_MATH_CONSTANT_RADICAL_DEGREE_BOTTOM_RAISE_PERCENT

   

Since: 1.3.3


enum hb_ot_math_kern_t

Members

HB_OT_MATH_KERN_TOP_RIGHT

   

HB_OT_MATH_KERN_TOP_LEFT

   

HB_OT_MATH_KERN_BOTTOM_RIGHT

   

HB_OT_MATH_KERN_BOTTOM_LEFT

   

Since: 1.3.3


hb_ot_math_glyph_variant_t

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

Since: 1.3.3


enum hb_ot_math_glyph_part_flags_t

Members

HB_MATH_GLYPH_PART_FLAG_EXTENDER

   

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;

Since: 1.3.3

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