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3abba21f2d
This lets you turn off subpixel horizontal binning of glyphs. The option is a trade-off between even kerning and sharp text. * Closes https://github.com/emilk/egui/issues/8034
63 lines
1.8 KiB
Rust
63 lines
1.8 KiB
Rust
//! Everything related to text, fonts, text layout, cursors etc.
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pub mod cursor;
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mod font;
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mod fonts;
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mod text_layout;
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mod text_layout_types;
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pub use {
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fonts::{
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FontData, FontDefinitions, FontFamily, FontId, FontInsert, FontPriority, FontTweak, Fonts,
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FontsImpl, FontsView, InsertFontFamily,
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},
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text_layout::*,
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text_layout_types::*,
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};
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/// Suggested character to use to replace those in password text fields.
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pub const PASSWORD_REPLACEMENT_CHAR: char = '•';
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/// Controls how we render text
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#[derive(Clone, Copy, Debug, PartialEq)]
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#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
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pub struct TextOptions {
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/// Maximum size of the font texture.
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pub max_texture_side: usize,
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/// Controls how to convert glyph coverage to alpha.
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pub alpha_from_coverage: crate::AlphaFromCoverage,
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/// Whether to enable font hinting
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///
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/// (round some font coordinates to pixels for sharper text).
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///
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/// Default is `true`.
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pub font_hinting: bool,
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/// Enable sub-pixel binning for glyphs.
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///
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/// Sub-pixel binning renders each glyph at up to four fractional horizontal offsets,
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/// giving more even kerning at the cost of more atlas space.
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///
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/// It also lead to text looking more blurry.
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///
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/// This is always disabled for CJK characters (which have too many unique glyphs).
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///
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/// Can be overridden per font with [`FontTweak::subpixel_binning`].
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///
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/// Default: `true`.
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pub subpixel_binning: bool,
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}
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impl Default for TextOptions {
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fn default() -> Self {
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Self {
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max_texture_side: 2048, // Small but portable
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alpha_from_coverage: crate::AlphaFromCoverage::default(),
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font_hinting: true,
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subpixel_binning: true,
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}
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}
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}
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