Vendor dependencies for 0.3.0 release

vendor/ttf-parser/src/tables/vhea.rs

@@ -0,0 +1,43 @@
+//! A [Vertical Header Table](
+//! https://docs.microsoft.com/en-us/typography/opentype/spec/vhea) implementation.
+
+use crate::parser::Stream;
+
+/// A [Vertical Header Table](https://docs.microsoft.com/en-us/typography/opentype/spec/vhea).
+#[derive(Clone, Copy, Default, Debug)]
+pub struct Table {
+    /// Face ascender.
+    pub ascender: i16,
+    /// Face descender.
+    pub descender: i16,
+    /// Face line gap.
+    pub line_gap: i16,
+    /// Number of metrics in the `vmtx` table.
+    pub number_of_metrics: u16,
+}
+
+impl Table {
+    /// Parses a table from raw data.
+    pub fn parse(data: &[u8]) -> Option<Self> {
+        // Do not check the exact length, because some fonts include
+        // padding in table's length in table records, which is incorrect.
+        if data.len() < 36 {
+            return None;
+        }
+
+        let mut s = Stream::new(data);
+        s.skip::<u32>(); // version
+        let ascender = s.read::<i16>()?;
+        let descender = s.read::<i16>()?;
+        let line_gap = s.read::<i16>()?;
+        s.advance(24);
+        let number_of_metrics = s.read::<u16>()?;
+
+        Some(Table {
+            ascender,
+            descender,
+            line_gap,
+            number_of_metrics,
+        })
+    }
+}