Add benchmark for text layout and tesselation

epaint/src/lib.rs

@@ -63,7 +63,7 @@ pub use {
     shape::Shape,
     stats::PaintStats,
     stroke::Stroke,
-    tessellator::TessellationOptions,
+    tessellator::{TessellationOptions, Tessellator},
     text::{Galley, TextStyle},
     texture_atlas::{Texture, TextureAtlas},
 };

epaint/src/mesh.rs

@@ -45,6 +45,13 @@ impl Mesh {
         }
     }
 
+    /// Restore to default state, but without freeing memory.
+    pub fn clear(&mut self) {
+        self.indices.clear();
+        self.vertices.clear();
+        self.vertices = Default::default();
+    }
+
     pub fn bytes_used(&self) -> usize {
         std::mem::size_of::<Self>()
             + self.vertices.len() * std::mem::size_of::<Vertex>()

epaint/src/text/font.rs

@@ -218,8 +218,8 @@ impl Font {
     /// `\n` will (intentionally) show up as the replacement character.
     fn glyph_info(&self, c: char) -> (FontIndex, GlyphInfo) {
         {
-            if let Some(glyph_info) = self.glyph_info_cache.read().get(&c) {
-                return *glyph_info;
+            if let Some(font_index_glyph_info) = self.glyph_info_cache.read().get(&c) {
+                return *font_index_glyph_info;
             }
         }