Struct MathConstants 

pub struct MathConstants<'a> { /* private fields */ }

MathConstants

Implementations

impl<'a> MathConstants<'a>

pub const MIN_SIZE: usize

pub fn resolve_offset<O: Offset, R: FontRead<'a, Args = ()>>( &self, offset: O, ) -> Result<R, ReadError>

Resolve the provided offset from the start of this table.

pub fn offset_data(&self) -> FontData<'a>

Return a reference to this table’s raw data.

We use this in the compile crate to resolve offsets.

pub fn shape(&self) -> &Self

👎Deprecated:

just use the base type directly

Return a reference to the table’s ‘Shape’ struct.

This is a low level implementation detail, but it can be useful in some cases where you want to know things about a table’s layout, such as the byte offsets of specific fields.

pub fn script_percent_scale_down(&self) -> i16

Percentage of scaling down for level 1 superscripts and subscripts.

pub fn script_script_percent_scale_down(&self) -> i16

Percentage of scaling down for level 2 (scriptScript) superscripts and subscripts.

pub fn delimited_sub_formula_min_height(&self) -> UfWord

Minimum height required for a delimited expression (contained within parentheses, etc.) to be treated as a sub-formula.

pub fn display_operator_min_height(&self) -> UfWord

Minimum height of n-ary operators (such as integral and summation) for formulas in display mode (that is, appearing as standalone page elements, not embedded inline within text).

pub fn math_leading(&self) -> &'a MathValueRecord

White space to be left between math formulas to ensure proper line spacing.

pub fn axis_height(&self) -> &'a MathValueRecord

Axis height of the font.

pub fn accent_base_height(&self) -> &'a MathValueRecord

Maximum (ink) height of accent base that does not require raising the accents.

pub fn flattened_accent_base_height(&self) -> &'a MathValueRecord

Maximum (ink) height of accent base that does not require flattening the accents.

pub fn subscript_shift_down(&self) -> &'a MathValueRecord

The standard shift down applied to subscript elements.

pub fn subscript_top_max(&self) -> &'a MathValueRecord

Maximum allowed height of the (ink) top of subscripts that does not require moving subscripts further down.

pub fn subscript_baseline_drop_min(&self) -> &'a MathValueRecord

Minimum allowed drop of the baseline of subscripts relative to the (ink) bottom of the base.

pub fn superscript_shift_up(&self) -> &'a MathValueRecord

Standard shift up applied to superscript elements.

pub fn superscript_shift_up_cramped(&self) -> &'a MathValueRecord

Standard shift of superscripts relative to the base, in cramped style.

pub fn superscript_bottom_min(&self) -> &'a MathValueRecord

Minimum allowed height of the (ink) bottom of superscripts that does not require moving subscripts further up.

pub fn superscript_baseline_drop_max(&self) -> &'a MathValueRecord

Maximum allowed drop of the baseline of superscripts relative to the (ink) top of the base.

pub fn sub_superscript_gap_min(&self) -> &'a MathValueRecord

Minimum gap between the superscript and subscript ink.

pub fn superscript_bottom_max_with_subscript(&self) -> &'a MathValueRecord

The maximum level to which the (ink) bottom of superscript can be pushed to increase the gap between superscript and subscript, before subscript starts being moved down.

pub fn space_after_script(&self) -> &'a MathValueRecord

Extra white space to be added after each subscript and superscript.

pub fn upper_limit_gap_min(&self) -> &'a MathValueRecord

Minimum gap between the (ink) bottom of the upper limit, and the (ink) top of the base operator.

pub fn upper_limit_baseline_rise_min(&self) -> &'a MathValueRecord

Minimum distance between baseline of upper limit and (ink) top of the base operator.

pub fn lower_limit_gap_min(&self) -> &'a MathValueRecord

Minimum gap between (ink) top of the lower limit, and (ink) bottom of the base operator.

pub fn lower_limit_baseline_drop_min(&self) -> &'a MathValueRecord

Minimum distance between baseline of the lower limit and (ink) bottom of the base operator.

pub fn stack_top_shift_up(&self) -> &'a MathValueRecord

Standard shift up applied to the top element of a stack.

pub fn stack_top_display_style_shift_up(&self) -> &'a MathValueRecord

Standard shift up applied to the top element of a stack in display style.

pub fn stack_bottom_shift_down(&self) -> &'a MathValueRecord

Standard shift down applied to the bottom element of a stack.

pub fn stack_bottom_display_style_shift_down(&self) -> &'a MathValueRecord

Standard shift down applied to the bottom element of a stack in display style.

pub fn stack_gap_min(&self) -> &'a MathValueRecord

Minimum gap between (ink) bottom of the top element of a stack, and the (ink) top of the bottom element.

pub fn stack_display_style_gap_min(&self) -> &'a MathValueRecord

Minimum gap between (ink) bottom of the top element of a stack, and the (ink) top of the bottom element in display style.

pub fn stretch_stack_top_shift_up(&self) -> &'a MathValueRecord

Standard shift up applied to the top element of the stretch stack.

pub fn stretch_stack_bottom_shift_down(&self) -> &'a MathValueRecord

Standard shift down applied to the bottom element of the stretch stack.

pub fn stretch_stack_gap_above_min(&self) -> &'a MathValueRecord

Minimum gap between the ink of the stretched element, and the (ink) bottom of the element above.

pub fn stretch_stack_gap_below_min(&self) -> &'a MathValueRecord

Minimum gap between the ink of the stretched element, and the (ink) top of the element below.

pub fn fraction_numerator_shift_up(&self) -> &'a MathValueRecord

Standard shift up applied to the numerator.

pub fn fraction_numerator_display_style_shift_up(&self) -> &'a MathValueRecord

Standard shift up applied to the numerator in display style.

pub fn fraction_denominator_shift_down(&self) -> &'a MathValueRecord

Standard shift down applied to the denominator.

pub fn fraction_denominator_display_style_shift_down( &self, ) -> &'a MathValueRecord

Standard shift down applied to the denominator in display style.

pub fn fraction_numerator_gap_min(&self) -> &'a MathValueRecord

Minimum tolerated gap between the (ink) bottom of the numerator and the ink of the fraction bar.

pub fn fraction_num_display_style_gap_min(&self) -> &'a MathValueRecord

Minimum tolerated gap between the (ink) bottom of the numerator and the ink of the fraction bar in display style.

pub fn fraction_rule_thickness(&self) -> &'a MathValueRecord

Thickness of the fraction bar.

pub fn fraction_denominator_gap_min(&self) -> &'a MathValueRecord

Minimum tolerated gap between the ink of the fraction bar and the (ink) top of the denominator.

pub fn fraction_denom_display_style_gap_min(&self) -> &'a MathValueRecord

Minimum tolerated gap between the ink of the fraction bar and the (ink) top of the denominator in display style.

pub fn skewed_fraction_horizontal_gap(&self) -> &'a MathValueRecord

Horizontal distance between the top and bottom elements of a skewed fraction.

pub fn skewed_fraction_vertical_gap(&self) -> &'a MathValueRecord

Vertical distance between the ink of the top and bottom elements of a skewed fraction.

pub fn overbar_vertical_gap(&self) -> &'a MathValueRecord

Distance between the overbar and the (ink) top of he base.

pub fn overbar_rule_thickness(&self) -> &'a MathValueRecord

Thickness of overbar.

pub fn overbar_extra_ascender(&self) -> &'a MathValueRecord

Extra white space reserved above the overbar.

pub fn underbar_vertical_gap(&self) -> &'a MathValueRecord

Distance between underbar and (ink) bottom of the base.

pub fn underbar_rule_thickness(&self) -> &'a MathValueRecord

Thickness of underbar.

pub fn underbar_extra_descender(&self) -> &'a MathValueRecord

Extra white space reserved below the underbar.

pub fn radical_vertical_gap(&self) -> &'a MathValueRecord

Space between the (ink) top of the expression and the bar over it.

pub fn radical_display_style_vertical_gap(&self) -> &'a MathValueRecord

Space between the (ink) top of the expression and the bar over it in display style.

pub fn radical_rule_thickness(&self) -> &'a MathValueRecord

Thickness of the radical rule.

pub fn radical_extra_ascender(&self) -> &'a MathValueRecord

Extra white space reserved above the radical.

pub fn radical_kern_before_degree(&self) -> &'a MathValueRecord

Extra horizontal kern before the degree of a radical, if such is present.

pub fn radical_kern_after_degree(&self) -> &'a MathValueRecord

Negative kern after the degree of a radical, if such is present.

pub fn radical_degree_bottom_raise_percent(&self) -> i16

Height of the bottom of the radical degree, if such is present, in proportion to the ascender of the radical sign.

pub fn script_percent_scale_down_byte_range(&self) -> Range<usize>

pub fn script_script_percent_scale_down_byte_range(&self) -> Range<usize>

pub fn delimited_sub_formula_min_height_byte_range(&self) -> Range<usize>

pub fn display_operator_min_height_byte_range(&self) -> Range<usize>

pub fn math_leading_byte_range(&self) -> Range<usize>

pub fn axis_height_byte_range(&self) -> Range<usize>

pub fn accent_base_height_byte_range(&self) -> Range<usize>

pub fn flattened_accent_base_height_byte_range(&self) -> Range<usize>

pub fn subscript_shift_down_byte_range(&self) -> Range<usize>

pub fn subscript_top_max_byte_range(&self) -> Range<usize>

pub fn subscript_baseline_drop_min_byte_range(&self) -> Range<usize>

pub fn superscript_shift_up_byte_range(&self) -> Range<usize>

pub fn superscript_shift_up_cramped_byte_range(&self) -> Range<usize>

pub fn superscript_bottom_min_byte_range(&self) -> Range<usize>

pub fn superscript_baseline_drop_max_byte_range(&self) -> Range<usize>

pub fn sub_superscript_gap_min_byte_range(&self) -> Range<usize>

pub fn superscript_bottom_max_with_subscript_byte_range(&self) -> Range<usize>

pub fn space_after_script_byte_range(&self) -> Range<usize>

pub fn upper_limit_gap_min_byte_range(&self) -> Range<usize>

pub fn upper_limit_baseline_rise_min_byte_range(&self) -> Range<usize>

pub fn lower_limit_gap_min_byte_range(&self) -> Range<usize>

pub fn lower_limit_baseline_drop_min_byte_range(&self) -> Range<usize>

pub fn stack_top_shift_up_byte_range(&self) -> Range<usize>

pub fn stack_top_display_style_shift_up_byte_range(&self) -> Range<usize>

pub fn stack_bottom_shift_down_byte_range(&self) -> Range<usize>

pub fn stack_bottom_display_style_shift_down_byte_range(&self) -> Range<usize>

pub fn stack_gap_min_byte_range(&self) -> Range<usize>

pub fn stack_display_style_gap_min_byte_range(&self) -> Range<usize>

pub fn stretch_stack_top_shift_up_byte_range(&self) -> Range<usize>

pub fn stretch_stack_bottom_shift_down_byte_range(&self) -> Range<usize>

pub fn stretch_stack_gap_above_min_byte_range(&self) -> Range<usize>

pub fn stretch_stack_gap_below_min_byte_range(&self) -> Range<usize>

pub fn fraction_numerator_shift_up_byte_range(&self) -> Range<usize>

pub fn fraction_numerator_display_style_shift_up_byte_range( &self, ) -> Range<usize>

pub fn fraction_denominator_shift_down_byte_range(&self) -> Range<usize>

pub fn fraction_denominator_display_style_shift_down_byte_range( &self, ) -> Range<usize>

pub fn fraction_numerator_gap_min_byte_range(&self) -> Range<usize>

pub fn fraction_num_display_style_gap_min_byte_range(&self) -> Range<usize>

pub fn fraction_rule_thickness_byte_range(&self) -> Range<usize>

pub fn fraction_denominator_gap_min_byte_range(&self) -> Range<usize>

pub fn fraction_denom_display_style_gap_min_byte_range(&self) -> Range<usize>

pub fn skewed_fraction_horizontal_gap_byte_range(&self) -> Range<usize>

pub fn skewed_fraction_vertical_gap_byte_range(&self) -> Range<usize>

pub fn overbar_vertical_gap_byte_range(&self) -> Range<usize>

pub fn overbar_rule_thickness_byte_range(&self) -> Range<usize>

pub fn overbar_extra_ascender_byte_range(&self) -> Range<usize>

pub fn underbar_vertical_gap_byte_range(&self) -> Range<usize>

pub fn underbar_rule_thickness_byte_range(&self) -> Range<usize>

pub fn underbar_extra_descender_byte_range(&self) -> Range<usize>

pub fn radical_vertical_gap_byte_range(&self) -> Range<usize>

pub fn radical_display_style_vertical_gap_byte_range(&self) -> Range<usize>

pub fn radical_rule_thickness_byte_range(&self) -> Range<usize>

pub fn radical_extra_ascender_byte_range(&self) -> Range<usize>

pub fn radical_kern_before_degree_byte_range(&self) -> Range<usize>

pub fn radical_kern_after_degree_byte_range(&self) -> Range<usize>

pub fn radical_degree_bottom_raise_percent_byte_range(&self) -> Range<usize>

impl MathConstants<'_>

pub fn constant(&self, constant: MathConstant) -> i32

The value of a constant, in design units.

pub fn constant_for_ppem(&self, constant: MathConstant, ppem: u16) -> MathValue

The value of a constant, as read at a size.

The four percentages and the two minimum heights are stored as bare integers, so their delta_px is always zero.

Trait Implementations

impl<'a> Clone for MathConstants<'a>

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Default for MathConstants<'_>

fn default() -> Self

Returns the “default value” for a type.

impl<'a> FontRead<'a> for MathConstants<'a>

fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError>

Read an item, performing validation.

fn read(data: FontData<'a>) -> Result<Self, ReadError>

where Self: FontRead<'a, Args = ()>,

Read an instance of Self from the provided data, performing validation.

impl<'a> MinByteRange<'a> for MathConstants<'a>

fn min_byte_range(&self) -> Range<usize>

fn min_table_bytes(&self) -> &'a [u8]

impl ReadArgs for MathConstants<'_>

type Args = ()