Cleanse library

- Remove doc-comments for Typst functions from library
- Reduce number of library source files

2 files changed, 67 insertions, 0 deletions

diff --git a/src/layout/image.rs b/src/layout/image.rs
new file mode 100644
index 00000000..9ba8cd82
--- /dev/null
+++ b/src/layout/image.rs
@@ -0,0 +1,65 @@
+use super::*;
+use crate::image::ImageId;
+
+use ::image::GenericImageView;
+
+/// An image node.
+#[derive(Debug, Copy, Clone, PartialEq, Hash)]
+pub struct ImageNode {
+    /// The id of the image file.
+    pub id: ImageId,
+    /// The fixed width, if any.
+    pub width: Option<Linear>,
+    /// The fixed height, if any.
+    pub height: Option<Linear>,
+}
+
+impl Layout for ImageNode {
+    fn layout(
+        &self,
+        ctx: &mut LayoutContext,
+        regions: &Regions,
+    ) -> Vec<Constrained<Rc<Frame>>> {
+        let Regions { current, base, .. } = regions;
+        let mut constraints = Constraints::new(regions.expand);
+        constraints.set_base_using_linears(Spec::new(self.width, self.height), regions);
+
+        let width = self.width.map(|w| w.resolve(base.width));
+        let height = self.height.map(|w| w.resolve(base.height));
+
+        let dimensions = ctx.cache.image.get(self.id).buf.dimensions();
+        let pixel_width = dimensions.0 as f64;
+        let pixel_height = dimensions.1 as f64;
+        let pixel_ratio = pixel_width / pixel_height;
+
+        let size = match (width, height) {
+            (Some(width), Some(height)) => Size::new(width, height),
+            (Some(width), None) => Size::new(width, width / pixel_ratio),
+            (None, Some(height)) => Size::new(height * pixel_ratio, height),
+            (None, None) => {
+                constraints.exact = current.to_spec().map(Some);
+
+                let ratio = current.width / current.height;
+                if ratio < pixel_ratio && current.width.is_finite() {
+                    Size::new(current.width, current.width / pixel_ratio)
+                } else if current.height.is_finite() {
+                    // TODO: Fix issue with line spacing.
+                    Size::new(current.height * pixel_ratio, current.height)
+                } else {
+                    // Totally unbounded region, we have to make up something.
+                    Size::new(Length::pt(pixel_width), Length::pt(pixel_height))
+                }
+            }
+        };
+
+        let mut frame = Frame::new(size, size.height);
+        frame.push(Point::zero(), Element::Image(self.id, size));
+        vec![frame.constrain(constraints)]
+    }
+}
+
+impl From<ImageNode> for AnyNode {
+    fn from(image: ImageNode) -> Self {
+        Self::new(image)
+    }
+}
diff --git a/src/layout/mod.rs b/src/layout/mod.rs
index f1ae3e2a..10c30f41 100644
--- a/src/layout/mod.rs
+++ b/src/layout/mod.rs
@@ -4,12 +4,14 @@ mod background;
 mod fixed;
 mod frame;
 mod grid;
+mod image;
 mod incremental;
 mod pad;
 mod par;
 mod shaping;
 mod stack;
 
+pub use self::image::*;
 pub use background::*;
 pub use fixed::*;
 pub use frame::*;