WIP Extract gtext

node-graph/gtext/src/font_cache.rs

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+use dyn_any::DynAny;
+use graphene_application_io::EditorApi;
+use graphene_core::consts::{DEFAULT_FONT_FAMILY, DEFAULT_FONT_STYLE};
+use std::collections::HashMap;
+
+/// A font type (storing font family and font style and an optional preview URL)
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize, Hash, PartialEq, Eq, DynAny, specta::Type)]
+pub struct Font {
+	#[serde(rename = "fontFamily")]
+	pub font_family: String,
+	#[serde(rename = "fontStyle", deserialize_with = "migrate_font_style")]
+	pub font_style: String,
+}
+impl Font {
+	pub fn new(font_family: String, font_style: String) -> Self {
+		Self { font_family, font_style }
+	}
+}
+impl Default for Font {
+	fn default() -> Self {
+		Self::new(DEFAULT_FONT_FAMILY.into(), DEFAULT_FONT_STYLE.into())
+	}
+}
+/// A cache of all loaded font data and preview urls along with the default font (send from `init_app` in `editor_api.rs`)
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize, Default, PartialEq, DynAny)]
+pub struct FontCache {
+	/// Actual font file data used for rendering a font with ttf_parser and rustybuzz
+	font_file_data: HashMap<Font, Vec<u8>>,
+	/// Web font preview URLs used for showing fonts when live editing
+	preview_urls: HashMap<Font, String>,
+}
+impl FontCache {
+	/// Returns the font family name if the font is cached, otherwise returns the fallback font family name if that is cached
+	pub fn resolve_font<'a>(&'a self, font: &'a Font) -> Option<&'a Font> {
+		if self.font_file_data.contains_key(font) {
+			Some(font)
+		} else {
+			self.font_file_data.keys().find(|font| font.font_family == DEFAULT_FONT_FAMILY && font.font_style == DEFAULT_FONT_STYLE)
+		}
+	}
+
+	/// Try to get the bytes for a font
+	pub fn get<'a>(&'a self, font: &Font) -> Option<&'a Vec<u8>> {
+		self.resolve_font(font).and_then(|font| self.font_file_data.get(font))
+	}
+
+	/// Check if the font is already loaded
+	pub fn loaded_font(&self, font: &Font) -> bool {
+		self.font_file_data.contains_key(font)
+	}
+
+	/// Insert a new font into the cache
+	pub fn insert(&mut self, font: Font, perview_url: String, data: Vec<u8>) {
+		self.font_file_data.insert(font.clone(), data);
+		self.preview_urls.insert(font, perview_url);
+	}
+
+	/// Gets the preview URL for showing in text field when live editing
+	pub fn get_preview_url(&self, font: &Font) -> Option<&String> {
+		self.preview_urls.get(font)
+	}
+}
+
+impl std::hash::Hash for FontCache {
+	fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+		self.preview_urls.len().hash(state);
+		self.preview_urls.iter().for_each(|(font, url)| {
+			font.hash(state);
+			url.hash(state)
+		});
+		self.font_file_data.len().hash(state);
+		self.font_file_data.keys().for_each(|font| font.hash(state));
+	}
+}
+
+// TODO: Eventually remove this migration document upgrade code
+fn migrate_font_style<'de, D: serde::Deserializer<'de>>(deserializer: D) -> Result<String, D::Error> {
+	use serde::Deserialize;
+	String::deserialize(deserializer).map(|name| if name == "Normal (400)" { "Regular (400)".to_string() } else { name })
+}
+
+pub trait EditorApiFontCacheExt {
+	fn get_font_cache(&self) -> &FontCache;
+}
+
+impl<Io> EditorApiFontCacheExt for EditorApi<Io> {
+	fn get_font_cache(&self) -> &FontCache {
+		let mut guard = self.font_cache.lock().unwrap();
+		if *guard == None {
+			*guard = Some(Box::new(FontCache::default()));
+		}
+		*guard.as_ref().unwrap().downcast_ref().unwrap();
+	}
+}