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// SPDX-License-Identifier: MIT
#![cfg_attr(not(feature = "std"), no_std)]
#[cfg(not(feature = "std"))]
extern crate alloc;
#[cfg(not(feature = "std"))]
use num_traits::float::FloatCore;
#[cfg(all(feature = "std", not(target_os = "redox")))]
pub use font_loader::{
self,
system_fonts::{self, FontProperty, FontPropertyBuilder},
};
#[cfg(not(feature = "std"))]
use alloc::string::{String, ToString};
#[cfg(not(feature = "std"))]
use alloc::vec::Vec;
use orbclient::{Color, Renderer};
#[derive(Clone)]
pub struct Font {
inner: rusttype::Font<'static>,
}
impl Font {
/// Find a font from an optional type, family, and style, such as "Mono", "Fira", "Regular"
#[cfg(all(feature = "std", target_os = "redox"))]
pub fn find(
typeface: Option<&str>,
family: Option<&str>,
style: Option<&str>,
) -> Result<Font, String> {
Font::from_path(&format!(
"/usr/share/fonts/{}/{}/{}.ttf",
typeface.unwrap_or("Mono"),
family.unwrap_or("Fira"),
style.unwrap_or("Regular")
))
}
// A funciton to automate the process of building a font property from "typeface, family, style"
#[cfg(all(feature = "std", not(target_os = "redox")))]
fn build_fontproperty(
typeface: Option<&str>,
family: Option<&str>,
style: Option<&str>,
) -> FontProperty {
let mut font = FontPropertyBuilder::new();
if let Some(style) = style {
let style_caps = &style.to_uppercase();
let italic = style_caps.contains("ITALIC");
let oblique = style_caps.contains("OBLIQUE");
let bold = style_caps.contains("BOLD");
if italic {
font = font.italic();
}
if oblique {
font = font.oblique();
}
if bold {
font = font.bold();
}
}
if let Some(typeface) = typeface {
// FontProperty has no support for differentiating Sans and Serif.
let typeface_caps = &typeface.to_uppercase();
if typeface_caps.contains("MONO") {
font = font.monospace();
}
}
if let Some(family) = family {
if let Some(typeface) = typeface {
let typeface_caps = &typeface.to_uppercase();
// manually adding Serif and Sans
if typeface_caps.contains("SERIF") {
font = font.family(&[family, "Serif"].concat());
} else if typeface_caps.contains("SANS") {
font = font.family(&[family, "Sans"].concat());
}
} else {
font = font.family(family);
}
}
font.build()
}
#[cfg(all(feature = "std", not(target_os = "redox")))]
pub fn find(
typeface: Option<&str>,
family: Option<&str>,
style: Option<&str>,
) -> Result<Font, String> {
// This funciton attempts to use the rust-font-loader library, a frontend
// to the ubiquitous C library fontconfig, to find and load the specified
// font.
let mut font = Font::build_fontproperty(typeface, family, style);
// font_loader::query specific returns an empty vector if there are no matches
// and does not tag the result with associated data like "italic", merely returns
// the name of the font if it exists.
let fonts = system_fonts::query_specific(&mut font); // Returns an empty vector if there are no matches.
// Confirm that a font matched:
if !fonts.is_empty() {
// get the matched font straight from the data:
let font_data = system_fonts::get(&font); // Getting font data from properties
match font_data {
Some((data, _)) => {
if let Some(font) = rusttype::Font::try_from_vec(data) {
Ok(Font { inner: font })
} else {
Err("error constructing a Font from bytes".to_string())
}
}
None => Err(format!("Could not get font {} from data", &fonts[0])),
}
} else {
// If no font matched, try again with no family, as concatenating "Sans" or "Serif" may rule out legitimate fonts
let mut font = Font::build_fontproperty(None, family, style);
let fonts = system_fonts::query_specific(&mut font);
if !fonts.is_empty() {
let font_data = system_fonts::get(&font);
match font_data {
Some((data, _)) => {
if let Some(font) = rusttype::Font::try_from_vec(data) {
Ok(Font { inner: font })
} else {
Err("error constructing a Font from bytes".to_string())
}
}
None => Err(format!("Could not get font {} from data", &fonts[0])),
}
} else {
// If no font matched, try to load the default font manually
Font::from_path("/usr/share/fonts/truetype/liberation/LiberationMono-Regular.ttf")
}
}
}
/// Load a font from file path
#[cfg(feature = "std")]
pub fn from_path<P: AsRef<std::path::Path>>(path: P) -> Result<Font, String> {
let data = std::fs::read(path).map_err(|err| format!("failed to read font: {}", err))?;
if let Some(font) = rusttype::Font::try_from_vec(data) {
Ok(Font { inner: font })
} else {
Err("error constructing a Font from bytes".to_string())
}
}
/// Load a font from a slice
pub fn from_data(data: &'static [u8]) -> Result<Font, String> {
if let Some(font) = rusttype::Font::try_from_bytes(data) {
Ok(Font { inner: font })
} else {
Err("error constructing a Font from bytes".to_string())
}
}
/// Render provided text using the font
pub fn render<'a>(&'a self, text: &str, height: f32) -> Text<'a> {
let scale = rusttype::Scale::uniform(height);
// The origin of a line of text is at the baseline (roughly where non-descending letters sit).
// We don't want to clip the text, so we shift it down with an offset when laying it out.
// v_metrics.ascent is the distance between the baseline and the highest edge of any glyph in
// the font. That's enough to guarantee that there's no clipping.
let v_metrics = self.inner.v_metrics(scale);
let offset = rusttype::point(0.0, v_metrics.ascent);
// Glyphs to draw for "RustType". Feel free to try other strings.
let glyphs: Vec<rusttype::PositionedGlyph> =
self.inner.layout(text, scale, offset).collect();
// Find the most visually pleasing width to display
let width = glyphs
.iter()
.rev()
.find_map(|g| {
g.pixel_bounding_box()
.map(|b| b.min.x as f32 + g.unpositioned().h_metrics().advance_width)
})
.unwrap_or(0.0);
Text {
w: width.ceil() as u32,
h: height.ceil() as u32,
glyphs,
}
}
}
pub struct Text<'a> {
w: u32,
h: u32,
glyphs: Vec<rusttype::PositionedGlyph<'a>>,
}
impl<'a> Text<'a> {
/// Return width of the text
pub fn width(&self) -> u32 {
self.w
}
/// Return height of the text
pub fn height(&self) -> u32 {
self.h
}
/// Draw the text onto a window and clipp the text to the given bounds
pub fn draw_clipped<R: Renderer + ?Sized>(
&self,
renderer: &mut R,
x: i32,
y: i32,
bounds_x: i32,
bounds_width: u32,
color: Color,
) {
for g in &self.glyphs {
if let Some(bb) = g.pixel_bounding_box() {
g.draw(|off_x, off_y, v| {
let off_x = off_x as i32 + bb.min.x;
let off_y = off_y as i32 + bb.min.y;
// There's still a possibility that the glyph clips the boundaries of the bitmap
if off_x >= 0
&& off_x < self.w as i32
&& off_y >= 0
&& off_y < self.h as i32
&& x + off_x >= bounds_x
&& x + off_x <= bounds_x + bounds_width as i32
{
let c = (v * 255.0) as u32;
renderer.pixel(
x + off_x,
y + off_y,
Color {
data: c << 24 | (color.data & 0x00FF_FFFF),
},
);
}
});
}
}
}
/// Draw the text onto a window
pub fn draw<R: Renderer + ?Sized>(&self, renderer: &mut R, x: i32, y: i32, color: Color) {
self.draw_clipped(renderer, x, y, x, self.w, color);
}
}