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valadaptive
609dd2d28e
<!-- Please read the "Making a PR" section of [`CONTRIBUTING.md`](https://github.com/emilk/egui/blob/main/CONTRIBUTING.md) before opening a Pull Request! * Keep your PR:s small and focused. * The PR title is what ends up in the changelog, so make it descriptive! * If applicable, add a screenshot or gif. * If it is a non-trivial addition, consider adding a demo for it to `egui_demo_lib`, or a new example. * Do NOT open PR:s from your `master` branch, as that makes it hard for maintainers to test and add commits to your PR. * Remember to run `cargo fmt` and `cargo clippy`. * Open the PR as a draft until you have self-reviewed it and run `./scripts/check.sh`. * When you have addressed a PR comment, mark it as resolved. Please be patient! I will review your PR, but my time is limited! --> * Closes N/A * [x] I have followed the instructions in the PR template I'll probably come back to this and clean it up a bit. This PR reimplements ab_glyph's functionality on top of Skrifa, a somewhat lower-level font API that's being used in Chrome now. Skrifa doesn't perform rasterization itself, so I'm using [vello_cpu](https://github.com/linebender/vello) from the Linebender project for rasterization. It's still in its early days, but I believe it's already quite fast. It also supports color and gradient fills, so color emoji support will be easier. Skrifa also supports font hinting, which should make text look a bit nicer / less blurry. Here's the current ab_glyph rendering: <img width="1592" height="1068" alt="image" src="https://github.com/user-attachments/assets/2385b66e-23f8-4c6e-b8c2-ea90e0eea4e4" /> Here's Skrifa *without* hinting--it looks almost identical, but there are some subpixel differences, probably due to rasterizer behavior: <img width="1592" height="1068" alt="image" src="https://github.com/user-attachments/assets/a815f3e9-65ac-4940-bc00-571177bef53d" /> Here's Skrifa *with* hinting: <img width="1592" height="1068" alt="image" src="https://github.com/user-attachments/assets/d6cc0669-3537-4377-bba9-ed5ef09664db" /> Hinting does make the horizontal strokes look a bit bolder, which makes me wonder once again about increasing the font weight from "light" to "regular". --------- Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
51 lines
1.3 KiB
Rust
51 lines
1.3 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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/// One `\t` character is this many spaces wide.
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pub const TAB_SIZE: usize = 4;
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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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}
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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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}
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}
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}
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