ddidderr
42f05c926d
Ports main_wasm.zig as crates/ghostty-wasm (cdylib exporting the Zig names: atlas_*, face_*, deferred_face_*, shaper_*, config_*), the web_canvas font face and shaper (backend selected on wasm32), os/wasm (logging, target, JS interop) and config/Wasm.zig. C-library dependencies (freetype, harfbuzz, fontconfig, onig, gettext, D-Bus, rustix) are target-gated. Like Zig's wasm build, link regex search (StringMap::search_iterator) is unavailable without Oniguruma; Collection/SharedGrid/harfbuzz are compiled out on wasm32. ghostty-os switches from forbid to deny unsafe_code for the JS import blocks. The JS import ABI is currently a documented handle-based interface with a reference host (js/ghostty_host.js); aligning it with zig-js's exact import names follows separately. Test Plan: - cargo build --target wasm32-unknown-unknown -p ghostty-font \ -p ghostty-config -p ghostty-terminal -p ghostty-vt -p ghostty-wasm - cargo test -p ghostty-wasm (node runs the module against a fake canvas)
82 lines
2.5 KiB
Rust
82 lines
2.5 KiB
Rust
//! A deferred face represents a single font face with all the information
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//! necessary to load it, but defers loading the full face until it is
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//! needed. Port of `font/DeferredFace.zig` (web_canvas variant, wasm32).
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pub use crate::face::web_canvas::Face;
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use crate::{
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Presentation,
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face::{DesiredSize, web_canvas::Error},
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};
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/// WebCanvas specific data.
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#[derive(Debug, Clone)]
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pub struct WebCanvas {
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/// The CSS "font" attribute, excluding size.
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pub font_str: String,
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/// The presentation for this font.
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pub presentation: Presentation,
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}
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#[derive(Debug, Default)]
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pub struct DeferredFace {
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pub wc: Option<WebCanvas>,
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}
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impl DeferredFace {
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pub fn from_web_canvas(wc: WebCanvas) -> DeferredFace {
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DeferredFace { wc: Some(wc) }
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}
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/// Returns the family name of the font.
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pub fn family_name(&self) -> String {
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self.wc
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.as_ref()
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.map(|wc| wc.font_str.clone())
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.unwrap_or_default()
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}
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/// Returns the name of this face.
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pub fn name(&self) -> String {
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self.family_name()
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}
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/// Load the deferred font face.
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pub fn load(&mut self, size: DesiredSize) -> Result<Face, Error> {
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let wc = self
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.wc
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.as_ref()
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.expect("deferred face has no web canvas data");
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Face::init_named(&wc.font_str, size, wc.presentation)
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}
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/// Returns true if this face can satisfy the given codepoint and
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/// presentation. Canvas always has the codepoint because we have no way
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/// of really checking and we let the browser handle it.
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pub fn has_codepoint(&self, cp: u32, p: Option<Presentation>) -> bool {
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let Some(wc) = &self.wc else {
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// Unreachable upstream: the face MUST be loaded.
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unreachable!("deferred face without web canvas data");
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};
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// Fast-path if we have a specific presentation and we don't match,
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// then it is definitely not this face.
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if p.is_some_and(|desired| wc.presentation != desired) {
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return false;
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}
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// Slow-path: we initialize the font, render it, and check if it
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// works and the presentation matches.
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match Face::init_named(&wc.font_str, DesiredSize::new(12.0), wc.presentation) {
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Ok(face) => face.glyph_index(cp).is_some(),
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Err(err) => {
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log::warn!(
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"failed to init face for codepoint check face={} err={err}",
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wc.font_str
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);
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false
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}
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}
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}
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}
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