Struct TrueTypeHinter 

pub(super) struct TrueTypeHinter {
    instance: HintInstance,
    tables: Option<Yoke<HintTables<'static>, Arc<Tables>>>,
    scale: Option<Scale26Dot6>,
    ppem: f32,
    pedantic: bool,
    hdmx_widths: Option<Range<usize>>,
    scratch_lengths: ScratchLengths,
}

The interpreter, configured for one font at one size.

Fields

instance: HintInstance

tables: Option<Yoke<HintTables<'static>, Arc<Tables>>>

The tables the interpreter reads, parsed once per font and yoked to the tables they borrow.

scale: Option<Scale26Dot6>

ppem: f32

The interpreter’s size, rounded for a font that requests whole pixel sizes.

pedantic: bool

hdmx_widths: Option<Range<usize>>

The byte range of the widths in the hdmx record for the size.

scratch_lengths: ScratchLengths

Implementations

impl TrueTypeHinter

pub(super) fn reconfigure( &mut self, font: &Font, ppem: f32, hinting: &HintOptions, ) -> Result<(), ScaleError>

Runs the font and control value programs for font at ppem.

pub(super) fn is_enabled(&self) -> bool

Returns true if glyphs are hinted at this size.

The control value program or the gasp table can disable hinting for a size.

pub(super) fn program_unhinted_ppem(&self) -> Option<f32>

Returns the size for an unhinted draw when the control value program disabled hinting.

This is the interpreter’s size, because FreeType chooses its scale before it reads the program’s flag. Returns None when hinting is on or when the gasp table disabled it. FreeType checks gasp before choosing a scale, so it draws at the requested size.

pub(super) fn ppem(&self) -> Option<f32>

Returns the size the interpreter hints at, once configured.

pub(super) fn raster_policy(&self) -> RasterPolicy

pub(super) fn required_memory_size(&self, outline: &GlyfGlyph<'_>) -> usize

Returns the bytes of working memory needed to draw outline.

This covers the loader’s buffers and the interpreter’s.

pub(super) fn draw( &self, outline: &GlyfGlyph<'_>, memory: Option<&mut [u8]>, sink: &mut dyn PathSink, ) -> Result<DrawnMetrics, ScaleError>

fn draw_in( &self, outline: &GlyfGlyph<'_>, buf: &mut [u8], sink: &mut dyn PathSink, ) -> Result<DrawnMetrics, ScaleError>

fn hdmx_width(&self, tables: &Tables, glyph: GlyphId) -> Option<i32>

Returns the hdmx advance for glyph at the size, if any.

Trait Implementations

impl Default for TrueTypeHinter

fn default() -> TrueTypeHinter

Returns the “default value” for a type.