Add opacity

Cargo.toml

@@ -10,8 +10,8 @@ license = "MIT OR Apache-2.0 OR Zlib"
 [dependencies]
 wgpu = "0.19"
 etagere = "0.2.10"
-cosmic-text = "0.10"
 lru = "0.12.1"
+cosmic-text = "0.11.2"
 
 [dev-dependencies]
 winit = { version = "0.29.10", features = ["rwh_05"] }

src/lib.rs

@@ -111,6 +111,8 @@ pub struct TextArea<'a> {
     /// The visible bounds of the text area. This is used to clip the text and doesn't have to
     /// match the `left` and `top` values.
     pub bounds: TextBounds,
-    // The default color of the text area.
+    /// The default color of the text area.
     pub default_color: Color,
+    /// The opacity to set the text area to (in gamma space)
+    pub opacity: f32,
 }

src/text_render.rs

@@ -268,6 +268,13 @@ impl TextRenderer {
                         None => text_area.default_color,
                     };
 
+                    let color = cosmic_text::Color::rgba(
+                        (color.r() as f32 * text_area.opacity + 0.5) as u8,
+                        (color.g() as f32 * text_area.opacity + 0.5) as u8,
+                        (color.b() as f32 * text_area.opacity + 0.5) as u8,
+                        (color.a() as f32 * text_area.opacity + 0.5) as u8,
+                    );
+
                     let depth = metadata_to_depth(glyph.metadata);
 
                     glyph_vertices.extend(