Draft metrics hinting support

src/buffer.rs

@@ -216,6 +216,7 @@ pub struct Buffer {
     wrap: Wrap,
     monospace_width: Option<f32>,
     tab_width: u16,
+    hint: bool,
 }
 
 impl Clone for Buffer {
@@ -230,6 +231,7 @@ impl Clone for Buffer {
             wrap: self.wrap,
             monospace_width: self.monospace_width,
             tab_width: self.tab_width,
+            hint: self.hint,
         }
     }
 }
@@ -246,7 +248,7 @@ impl Buffer {
     /// # Panics
     ///
     /// Will panic if `metrics.line_height` is zero.
-    pub fn new_empty(metrics: Metrics) -> Self {
+    pub fn new_empty(metrics: Metrics, hint: bool) -> Self {
         assert_ne!(metrics.line_height, 0.0, "line height cannot be 0");
         Self {
             lines: Vec::new(),
@@ -258,6 +260,7 @@ impl Buffer {
             wrap: Wrap::WordOrGlyph,
             monospace_width: None,
             tab_width: 8,
+            hint,
         }
     }
 
@@ -266,8 +269,8 @@ impl Buffer {
     /// # Panics
     ///
     /// Will panic if `metrics.line_height` is zero.
-    pub fn new(font_system: &mut FontSystem, metrics: Metrics) -> Self {
-        let mut buffer = Self::new_empty(metrics);
+    pub fn new(font_system: &mut FontSystem, metrics: Metrics, hint: bool) -> Self {
+        let mut buffer = Self::new_empty(metrics, hint);
         buffer.set_text(font_system, "", &Attrs::new(), Shaping::Advanced, None);
         buffer
     }
@@ -297,6 +300,7 @@ impl Buffer {
                     self.wrap,
                     self.monospace_width,
                     self.tab_width,
+                    self.hint,
                 );
             }
         }
@@ -540,6 +544,7 @@ impl Buffer {
             self.wrap,
             self.monospace_width,
             self.tab_width,
+            self.hint,
         ))
     }
 
@@ -719,7 +724,7 @@ impl Buffer {
     /// ```
     /// # use cosmic_text::{Attrs, Buffer, Family, FontSystem, Metrics, Shaping};
     /// # let mut font_system = FontSystem::new();
-    /// let mut buffer = Buffer::new_empty(Metrics::new(32.0, 44.0));
+    /// let mut buffer = Buffer::new_empty(Metrics::new(32.0, 44.0), false);
     /// let attrs = Attrs::new().family(Family::Serif);
     /// buffer.set_rich_text(
     ///     &mut font_system,
@@ -1448,7 +1453,7 @@ impl BorrowedWithFontSystem<'_, Buffer> {
     /// ```
     /// # use cosmic_text::{Attrs, Buffer, Family, FontSystem, Metrics, Shaping};
     /// # let mut font_system = FontSystem::new();
-    /// let mut buffer = Buffer::new_empty(Metrics::new(32.0, 44.0));
+    /// let mut buffer = Buffer::new_empty(Metrics::new(32.0, 44.0), false);
     /// let attrs = Attrs::new().family(Family::Serif);
     /// buffer.set_rich_text(
     ///     &mut font_system,