Struct write_fonts::tables::hhea::Hhea

pub struct Hhea {
    pub ascender: FWord,
    pub descender: FWord,
    pub line_gap: FWord,
    pub advance_width_max: UfWord,
    pub min_left_side_bearing: FWord,
    pub min_right_side_bearing: FWord,
    pub x_max_extent: FWord,
    pub caret_slope_rise: i16,
    pub caret_slope_run: i16,
    pub caret_offset: i16,
    pub number_of_long_metrics: u16,
}

hhea Horizontal Header Table

Fields

ascender: FWord

Typographic ascent.

descender: FWord

Typographic descent.

line_gap: FWord

Typographic line gap. Negative LineGap values are treated as zero in some legacy platform implementations.

advance_width_max: UfWord

Maximum advance width value in ‘hmtx’ table.

min_left_side_bearing: FWord

Minimum left sidebearing value in ‘hmtx’ table for glyphs with contours (empty glyphs should be ignored).

min_right_side_bearing: FWord

Minimum right sidebearing value; calculated as min(aw - (lsb + xMax - xMin)) for glyphs with contours (empty glyphs should be ignored).

x_max_extent: FWord

Max(lsb + (xMax-xMin))

caret_slope_rise: i16

Used to calculate the slope of the cursor (rise/run); 1 for vertical caret, 0 for horizontal.

caret_slope_run: i16

0 for vertical caret, 1 for horizontal.

caret_offset: i16

The amount by which a slanted highlight on a glyph needs to be shifted to produce the best appearance. Set to 0 for non-slanted fonts

number_of_long_metrics: u16

Number of LongMetric entries in ‘hmtx’/‘vmtx’ table

Implementations

impl Hhea

pub fn new( ascender: FWord, descender: FWord, line_gap: FWord, advance_width_max: UfWord, min_left_side_bearing: FWord, min_right_side_bearing: FWord, x_max_extent: FWord, caret_slope_rise: i16, caret_slope_run: i16, caret_offset: i16, number_of_long_metrics: u16 ) -> Self

Construct a new Hhea

Trait Implementations

impl Clone for Hhea

fn clone(&self) -> Hhea

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Hhea

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Hhea

fn default() -> Hhea

Returns the “default value” for a type.

impl<'a> FontRead<'a> for Hhea

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

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

impl FontWrite for Hhea

fn write_into(&self, writer: &mut TableWriter)

Write our data and information about offsets into this TableWriter.

fn name(&self) -> &'static str

impl TopLevelTable for Hhea

const TAG: Tag = _

The table’s tag.

impl Validate for Hhea

fn validate_impl(&self, _ctx: &mut ValidationCtx)

Validate this table.

fn validate(&self) -> Result<(), ValidationReport>

Ensure that this table is well-formed, reporting any errors.