Struct FontModifier 

pub struct FontModifier { /* private fields */ }

Font modifier for updating font properties.

Provides a builder-style API for modifying font metadata, metrics, and other properties. Changes are tracked internally and applied when commit() is called.

Note

Full round-trip serialization with proper offset recalculation is currently in development. Some modifications may not persist correctly when saving and reloading the font.

Implementations

impl FontModifier

pub fn new(font: Font) -> Self

pub fn set_font_name(&mut self, name: &str) -> Result<&mut Self>

Set font family name (name ID 1).

Updates the font family name in the name table.

Arguments

• name - The new font family name

Examples

let font = Font::load("font.ttf")?;
let mut modifier = font.modify();
modifier.set_font_name("My Font Family")?;

pub fn set_full_font_name(&mut self, name: &str) -> Result<&mut Self>

Set full font name (name ID 4).

Updates the full font name (family + style) in the name table.

Arguments

• name - The new full font name

pub fn set_version(&mut self, major: u16, minor: u16) -> Result<&mut Self>

Set version string (name ID 5).

Updates the version string in the name table and font revision in head table.

Arguments

• major - Major version number
• minor - Minor version number

Examples

let font = Font::load("font.ttf")?;
let mut modifier = font.modify();
modifier.set_version(2, 0)?;

pub fn set_copyright(&mut self, copyright: &str) -> Result<&mut Self>

Set copyright notice (name ID 0).

Updates the copyright notice in the name table.

Arguments

• copyright - The copyright notice text

pub fn set_trademark(&mut self, trademark: &str) -> Result<&mut Self>

Set trademark notice (name ID 7).

Updates the trademark notice in the name table.

Arguments

• trademark - The trademark notice text

pub fn set_font_revision(&mut self, major: u16, minor: u16) -> Result<&mut Self>

Update font version and revision in head table.

Sets the font revision number in the head table.

Arguments

• major - Major version number
• minor - Minor version number (0-99)

pub fn set_embedding_type(&mut self, embedding_type: u16) -> Result<&mut Self>

Modify embedding permissions in OS/2 table

pub fn set_localized_font_name( &mut self, name: &str, language_id: u16, ) -> Result<&mut Self>

Set font name in multiple languages

pub fn set_font_metrics( &mut self, units_per_em: u16, ascender: i16, descender: i16, line_gap: i16, ) -> Result<&mut Self>

Update font metrics in head and hhea tables

pub fn set_glyph_advance( &mut self, glyph_index: usize, advance_width: u16, ) -> Result<&mut Self>

Modify glyph advance widths

pub fn commit(self) -> Result<Font>

Commit all modifications and return the modified font