Struct Head 

pub struct Head<'a> {
    data: FontData<'a>,
}

The head (font header) table.

Fields

data: FontData<'a>

Implementations

impl<'a> Head<'a>

pub const MIN_SIZE: usize

pub fn resolve_offset<O: Offset, R: FontRead<'a>>( &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 version(&self) -> MajorMinor

Version number of the font header table, set to (1, 0)

pub fn font_revision(&self) -> Fixed

Set by font manufacturer.

pub fn checksum_adjustment(&self) -> u32

To compute: set it to 0, sum the entire font as uint32, then store 0xB1B0AFBA - sum. If the font is used as a component in a font collection file, the value of this field will be invalidated by changes to the file structure and font table directory, and must be ignored.

pub fn magic_number(&self) -> u32

Set to 0x5F0F3CF5.

pub fn flags(&self) -> Flags

See the flags enum.

pub fn units_per_em(&self) -> u16

Set to a value from 16 to 16384. Any value in this range is valid. In fonts that have TrueType outlines, a power of 2 is recommended as this allows performance optimizations in some rasterizers.

pub fn created(&self) -> LongDateTime

Number of seconds since 12:00 midnight that started January 1st 1904 in GMT/UTC time zone.

pub fn modified(&self) -> LongDateTime

Number of seconds since 12:00 midnight that started January 1st 1904 in GMT/UTC time zone.

pub fn x_min(&self) -> i16

Minimum x coordinate across all glyph bounding boxes.

pub fn y_min(&self) -> i16

Minimum y coordinate across all glyph bounding boxes.

pub fn x_max(&self) -> i16

Maximum x coordinate across all glyph bounding boxes.

pub fn y_max(&self) -> i16

Maximum y coordinate across all glyph bounding boxes.

pub fn mac_style(&self) -> MacStyle

Bits identifying the font’s style; see MacStyle

pub fn lowest_rec_ppem(&self) -> u16

Smallest readable size in pixels.

pub fn font_direction_hint(&self) -> i16

Deprecated (Set to 2).

pub fn index_to_loc_format(&self) -> i16

0 for short offsets (Offset16), 1 for long (Offset32).

pub fn glyph_data_format(&self) -> i16

0 for current format.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Trait Implementations

impl<'a> Clone for Head<'a>

fn clone(&self) -> Head<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> FontRead<'a> for Head<'a>

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

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

impl<'a> MinByteRange<'a> for Head<'a>

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

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

impl TopLevelTable for Head<'_>

const TAG: Tag

head