Struct RasterPolicy 

pub struct RasterPolicy {
    pub symmetric_smoothing: bool,
    pub grid_fit: bool,
}

The smoothing and grid fitting a font requests at a given size.

A rasterizer needs both properties. Self::symmetric_smoothing selects antialiasing along both axes or only horizontally. Self::grid_fit selects whether to hint at all. Windows reads the same two properties from the same source, so honoring them makes text match Windows.

See https://learn.microsoft.com/en-us/typography/opentype/spec/gasp.

Fields

symmetric_smoothing: bool

True if the rasterizer should smooth along both axes.

When false, the font expects antialiasing only in the horizontal direction. A rasterizer that smooths in both directions produces softer horizontal edges than the font expects.

This also sets the symmetric rendering bit of the GETINFO instruction.

grid_fit: bool

True if TrueType grid fitting should be applied.

Implementations

impl RasterPolicy

pub(crate) fn fallback(has_glyph_instructions: bool, ppem: u16) -> Self

Returns the policy DirectWrite applies when no version 1 gasp range covers the size.

This is asymmetric smoothing through 20 ppem for a font that has glyph instructions, and symmetric smoothing for everything else.

pub(crate) fn resolve<'a>(font: &impl TableProvider<'a>, ppem: u16) -> Self

Resolves the policy for the given font at the given nominal ppem.

Trait Implementations

impl Clone for RasterPolicy

fn clone(&self) -> RasterPolicy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for RasterPolicy

impl Debug for RasterPolicy

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

Formats the value using the given formatter.

impl Default for RasterPolicy

fn default() -> Self

Returns the “default value” for a type.

impl Eq for RasterPolicy

impl PartialEq for RasterPolicy

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for RasterPolicy