Enum Target

pub enum Target {
    Mono,
    Smooth {
        mode: SmoothMode,
        symmetric_rendering: bool,
        preserve_linear_metrics: bool,
    },
}

Defines the target settings for hinting.

Variants

Mono

Strong hinting style that should only be used for aliased, monochromatic rasterization.

Corresponds to FT_LOAD_TARGET_MONO in FreeType.

Smooth

Hinting style that is suitable for anti-aliased rasterization.

Corresponds to the non-monochrome load targets in FreeType. See SmoothMode for more detail.

Fields

mode: SmoothMode

The basic mode for smooth hinting.

Defaults to SmoothMode::Normal.

symmetric_rendering: bool

If true, TrueType bytecode may assume that the resulting outline will be rasterized with supersampling in the vertical direction.

When this is enabled, ClearType fonts will often generate wider horizontal stems that may lead to blurry images when rendered with an analytical area rasterizer (such as the one in FreeType).

The effect of this setting is to control the “ClearType symmetric rendering bit” of the TrueType GETINFO instruction. For more detail, see this issue.

FreeType has no corresponding setting and behaves as if this is always enabled.

This only applies to the TrueType interpreter.

Defaults to true.

preserve_linear_metrics: bool

If true, prevents adjustment of the outline in the horizontal direction and preserves inter-glyph spacing.

This is useful for performing layout without concern that hinting will modify the advance width of a glyph. Specifically, it means that layout will not require evaluation of glyph outlines.

FreeType has no corresponding setting and behaves as if this is always disabled.

This applies to the TrueType interpreter and the automatic hinter.

Defaults to false.

Trait Implementations

impl Clone for Target

fn clone(&self) -> Target

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Target

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

Formats the value using the given formatter.

impl Default for Target

fn default() -> Target

Returns the “default value” for a type.

impl From<SmoothMode> for Target

fn from(value: SmoothMode) -> Target

Converts to this type from the input type.

impl From<Target> for HintingOptions

fn from(value: Target) -> HintingOptions

Converts to this type from the input type.

impl PartialEq for Target

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl Copy for Target

impl Eq for Target

impl StructuralPartialEq for Target