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//! Draw text.
pub mod cache;
pub mod editor;
pub mod paragraph;
pub use cache::Cache;
pub use editor::Editor;
pub use paragraph::Paragraph;
pub use cosmic_text;
use crate::color;
use crate::core::font::{self, Font};
use crate::core::text::Shaping;
use crate::core::{Color, Size};
use once_cell::sync::OnceCell;
use std::borrow::Cow;
use std::sync::{Arc, RwLock};
/// Returns the global [`FontSystem`].
pub fn font_system() -> &'static RwLock<FontSystem> {
static FONT_SYSTEM: OnceCell<RwLock<FontSystem>> = OnceCell::new();
FONT_SYSTEM.get_or_init(|| {
RwLock::new(FontSystem {
raw: cosmic_text::FontSystem::new_with_fonts([
cosmic_text::fontdb::Source::Binary(Arc::new(
include_bytes!("../fonts/Iced-Icons.ttf").as_slice(),
)),
]),
version: Version::default(),
})
})
}
/// A set of system fonts.
#[allow(missing_debug_implementations)]
pub struct FontSystem {
raw: cosmic_text::FontSystem,
version: Version,
}
impl FontSystem {
/// Returns the raw [`cosmic_text::FontSystem`].
pub fn raw(&mut self) -> &mut cosmic_text::FontSystem {
&mut self.raw
}
/// Loads a font from its bytes.
pub fn load_font(&mut self, bytes: Cow<'static, [u8]>) {
let _ = self.raw.db_mut().load_font_source(
cosmic_text::fontdb::Source::Binary(Arc::new(bytes.into_owned())),
);
self.version = Version(self.version.0 + 1);
}
/// Returns the current [`Version`] of the [`FontSystem`].
///
/// Loading a font will increase the version of a [`FontSystem`].
pub fn version(&self) -> Version {
self.version
}
}
/// A version number.
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
pub struct Version(u32);
/// Measures the dimensions of the given [`cosmic_text::Buffer`].
pub fn measure(buffer: &cosmic_text::Buffer) -> Size {
let (width, total_lines) = buffer
.layout_runs()
.fold((0.0, 0usize), |(width, total_lines), run| {
(run.line_w.max(width), total_lines + 1)
});
Size::new(width, total_lines as f32 * buffer.metrics().line_height)
}
/// Returns the attributes of the given [`Font`].
pub fn to_attributes(font: Font) -> cosmic_text::Attrs<'static> {
cosmic_text::Attrs::new()
.family(to_family(font.family))
.weight(to_weight(font.weight))
.stretch(to_stretch(font.stretch))
.style(to_style(font.style))
}
fn to_family(family: font::Family) -> cosmic_text::Family<'static> {
match family {
font::Family::Name(name) => cosmic_text::Family::Name(name),
font::Family::SansSerif => cosmic_text::Family::SansSerif,
font::Family::Serif => cosmic_text::Family::Serif,
font::Family::Cursive => cosmic_text::Family::Cursive,
font::Family::Fantasy => cosmic_text::Family::Fantasy,
font::Family::Monospace => cosmic_text::Family::Monospace,
}
}
fn to_weight(weight: font::Weight) -> cosmic_text::Weight {
match weight {
font::Weight::Thin => cosmic_text::Weight::THIN,
font::Weight::ExtraLight => cosmic_text::Weight::EXTRA_LIGHT,
font::Weight::Light => cosmic_text::Weight::LIGHT,
font::Weight::Normal => cosmic_text::Weight::NORMAL,
font::Weight::Medium => cosmic_text::Weight::MEDIUM,
font::Weight::Semibold => cosmic_text::Weight::SEMIBOLD,
font::Weight::Bold => cosmic_text::Weight::BOLD,
font::Weight::ExtraBold => cosmic_text::Weight::EXTRA_BOLD,
font::Weight::Black => cosmic_text::Weight::BLACK,
}
}
fn to_stretch(stretch: font::Stretch) -> cosmic_text::Stretch {
match stretch {
font::Stretch::UltraCondensed => cosmic_text::Stretch::UltraCondensed,
font::Stretch::ExtraCondensed => cosmic_text::Stretch::ExtraCondensed,
font::Stretch::Condensed => cosmic_text::Stretch::Condensed,
font::Stretch::SemiCondensed => cosmic_text::Stretch::SemiCondensed,
font::Stretch::Normal => cosmic_text::Stretch::Normal,
font::Stretch::SemiExpanded => cosmic_text::Stretch::SemiExpanded,
font::Stretch::Expanded => cosmic_text::Stretch::Expanded,
font::Stretch::ExtraExpanded => cosmic_text::Stretch::ExtraExpanded,
font::Stretch::UltraExpanded => cosmic_text::Stretch::UltraExpanded,
}
}
fn to_style(style: font::Style) -> cosmic_text::Style {
match style {
font::Style::Normal => cosmic_text::Style::Normal,
font::Style::Italic => cosmic_text::Style::Italic,
font::Style::Oblique => cosmic_text::Style::Oblique,
}
}
/// Converts some [`Shaping`] strategy to a [`cosmic_text::Shaping`] strategy.
pub fn to_shaping(shaping: Shaping) -> cosmic_text::Shaping {
match shaping {
Shaping::Basic => cosmic_text::Shaping::Basic,
Shaping::Advanced => cosmic_text::Shaping::Advanced,
}
}
/// Converts some [`Color`] to a [`cosmic_text::Color`].
pub fn to_color(color: Color) -> cosmic_text::Color {
let [r, g, b, a] = color::pack(color).components();
cosmic_text::Color::rgba(
(r * 255.0) as u8,
(g * 255.0) as u8,
(b * 255.0) as u8,
(a * 255.0) as u8,
)
}
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