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dd8e487acc
The layout_info() would calculate the text metrics based on a different effective pixel size compared to the rendering.
59 lines
1.7 KiB
Rust
59 lines
1.7 KiB
Rust
/* LICENSE BEGIN
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This file is part of the SixtyFPS Project -- https://sixtyfps.io
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Copyright (c) 2020 Olivier Goffart <olivier.goffart@sixtyfps.io>
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Copyright (c) 2020 Simon Hausmann <simon.hausmann@sixtyfps.io>
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SPDX-License-Identifier: GPL-3.0-only
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This file is also available under commercial licensing terms.
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Please contact info@sixtyfps.io for more information.
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LICENSE END */
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use std::cell::RefCell;
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use std::collections::HashMap;
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use std::rc::Rc;
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#[cfg(not(target_arch = "wasm32"))]
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mod fontkit;
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#[cfg(not(target_arch = "wasm32"))]
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pub use fontkit::*;
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#[cfg(target_arch = "wasm32")]
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mod canvasfont;
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#[cfg(target_arch = "wasm32")]
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pub use canvasfont::*;
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struct FontMatch {
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handle: FontHandle,
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fonts_per_pixel_size: Vec<Rc<Font>>,
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}
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#[derive(Default)]
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pub struct FontCache {
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// index by family name
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loaded_fonts: RefCell<HashMap<String, FontMatch>>,
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}
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impl FontCache {
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pub fn find_font(&self, family: &str, pixel_size: f32) -> Rc<Font> {
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assert_ne!(pixel_size, 0.0);
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let mut loaded_fonts = self.loaded_fonts.borrow_mut();
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let font_match = loaded_fonts.entry(family.to_owned()).or_insert_with(|| FontMatch {
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handle: FontHandle::new_from_match(family),
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fonts_per_pixel_size: Vec::new(),
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});
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font_match
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.fonts_per_pixel_size
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.iter()
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.find_map(|font| if font.pixel_size == pixel_size { Some(font.clone()) } else { None })
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.unwrap_or_else(|| {
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let fnt = Rc::new(font_match.handle.load(pixel_size).unwrap());
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font_match.fonts_per_pixel_size.push(fnt.clone());
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fnt
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})
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}
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}
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thread_local! {
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pub static FONT_CACHE: FontCache = Default::default();
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}
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