Struct write_fonts::tables::head::Head

pub struct Head {

    pub font_revision: Fixed,
    pub checksum_adjustment: u32,
    pub magic_number: u32,
    pub flags: u16,
    pub units_per_em: u16,
    pub created: LongDateTime,
    pub modified: LongDateTime,
    pub x_min: i16,
    pub y_min: i16,
    pub x_max: i16,
    pub y_max: i16,
    pub mac_style: MacStyle,
    pub lowest_rec_ppem: u16,
    pub font_direction_hint: i16,
    pub index_to_loc_format: i16,
}

The head (font header) table.

Fields

font_revision: Fixed

Set by font manufacturer.

checksum_adjustment: 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.

magic_number: u32

Set to 0x5F0F3CF5.

flags: u16

See the flags enum

units_per_em: 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.

created: LongDateTime

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

modified: LongDateTime

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

x_min: i16

Minimum x coordinate across all glyph bounding boxes.

y_min: i16

Minimum y coordinate across all glyph bounding boxes.

x_max: i16

Maximum x coordinate across all glyph bounding boxes.

y_max: i16

Maximum y coordinate across all glyph bounding boxes.

mac_style: MacStyle

see somewhere else

lowest_rec_ppem: u16

Smallest readable size in pixels.

font_direction_hint: i16

Deprecated (Set to 2).

index_to_loc_format: i16

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

Implementations

impl Head

pub fn new( font_revision: Fixed, checksum_adjustment: u32, flags: u16, units_per_em: u16, created: LongDateTime, modified: LongDateTime, x_min: i16, y_min: i16, x_max: i16, y_max: i16, mac_style: MacStyle, lowest_rec_ppem: u16, index_to_loc_format: i16 ) -> Self

Construct a new Head

Trait Implementations

impl Clone for Head

fn clone(&self) -> Head

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Head

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

Formats the value using the given formatter.

impl Default for Head

fn default() -> Self

Returns the “default value” for a type.

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

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

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

impl FontWrite for Head

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

Write our data and information about offsets into this TableWriter.

fn table_type(&self) -> TableType

The type of this table.

impl Hash for Head

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Head

fn cmp(&self, other: &Head) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for Head

fn eq(&self, other: &Head) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Head

fn partial_cmp(&self, other: &Head) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl TopLevelTable for Head

const TAG: Tag = _

The table’s tag.

impl Validate for Head

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.

impl Eq for Head

impl StructuralEq for Head

impl StructuralPartialEq for Head