Struct kas_text::raster::Config

pub struct Config { /* fields omitted */ }

Raster configuration

Implementations

impl Config

pub fn new(
    mode: u8,
    scale_steps: u8,
    subpixel_threshold: u8,
    subpixel_steps: u8
) -> Self

Construct configuration

For large glyphs the effects of configuration will be mostly unnoticable but for small glyphs effects are more significant. The defaults will usually be a good choice. Results may depend on the font used.

The mode parameter selects rendering mode (though depending on crate features, not all renderers will be available):

• mode == 0 (default): use ab_glyph for rastering
• mode == 1: use ab_glyph and align glyphs to side bearings
• mode == 2: use fontdue for rastering

Fonts sizes, in pixels per Em, are rounded to a multiple of 1 / scale_steps. The default is scale_steps == 4.

For font sizes (in pixels per Em) less than subpixel_threshold, subpixel positioning is enabled with subpixel_steps (supporting between 1 and 16 steps). Subpixel positioning potentially allows better glyph spacing for small fonts, but tends to reduce rendering quality. By default subpixel_threshold == 0 (disabling the feature) and subpixel_steps == 5. Odd values of subpixel_steps appear to produce better results.

Trait Implementations

impl Debug for Config

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

Formats the value using the given formatter.

impl Default for Config

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq<Config> for Config

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

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

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

This method tests for !=.

impl StructuralPartialEq for Config