1 files changed, 40 insertions, 0 deletions
diff --git a/src/style/font/naive.rs b/src/style/font/naive.rs
new file mode 100644
index 0000000..9953040
--- /dev/null
+++ b/src/style/font/naive.rs
@@ -0,0 +1,40 @@
+use super::{FontData, FontFamily, FontStyle, LayoutBox};
+
+#[derive(Debug, Clone)]
+pub struct FontError;
+
+impl std::fmt::Display for FontError {
+    fn fmt(&self, fmt: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+        write!(fmt, "General Error")?;
+        Ok(())
+    }
+}
+
+impl std::error::Error for FontError {}
+
+#[derive(Clone)]
+pub struct FontDataInternal(String, String);
+
+impl FontData for FontDataInternal {
+    type ErrorType = FontError;
+    fn new(family: FontFamily, style: FontStyle) -> Result<Self, FontError> {
+        Ok(FontDataInternal(
+            family.as_str().into(),
+            style.as_str().into(),
+        ))
+    }
+
+    /// Note: This is only a crude estimatation, since for some backend such as SVG, we have no way to
+    /// know the real size of the text anyway. Thus using font-kit is an overkill and doesn't helps
+    /// the layout.
+    fn estimate_layout(&self, size: f64, text: &str) -> Result<LayoutBox, Self::ErrorType> {
+        let em = size / 1.24 / 1.24;
+        Ok((
+            (0, -em.round() as i32),
+            (
+                (em * 0.7 * text.len() as f64).round() as i32,
+                (em * 0.24).round() as i32,
+            ),
+        ))
+    }
+}