Refactored loading and cache architecture

1 files changed, 43 insertions, 0 deletions

diff --git a/src/loading/mod.rs b/src/loading/mod.rs
new file mode 100644
index 00000000..818e7e3c
--- /dev/null
+++ b/src/loading/mod.rs
@@ -0,0 +1,43 @@
+//! Resource loading.
+
+#[cfg(feature = "fs")]
+mod fs;
+
+#[cfg(feature = "fs")]
+pub use fs::*;
+
+use std::rc::Rc;
+
+use crate::font::FaceInfo;
+
+/// A shared byte buffer.
+pub type Buffer = Rc<Vec<u8>>;
+
+/// Loads resources from a local or remote source.
+pub trait Loader {
+    /// Descriptions of all font faces this loader serves.
+    fn faces(&self) -> &[FaceInfo];
+
+    /// Load the font face with the given index in [`faces()`](Self::faces).
+    fn load_face(&mut self, idx: usize) -> Option<Buffer>;
+
+    /// Load a file from a path.
+    fn load_file(&mut self, path: &str) -> Option<Buffer>;
+}
+
+/// A loader which serves nothing.
+pub struct BlankLoader;
+
+impl Loader for BlankLoader {
+    fn faces(&self) -> &[FaceInfo] {
+        &[]
+    }
+
+    fn load_face(&mut self, _: usize) -> Option<Buffer> {
+        None
+    }
+
+    fn load_file(&mut self, _: &str) -> Option<Buffer> {
+        None
+    }
+}