Merge pull request #914 from yusdacra/feat/expose_draw_cache_multithread

feat: expose draw_cache_multithread as a feature

glow/src/backend.rs

@@ -24,7 +24,12 @@ pub struct Backend {
 impl Backend {
     /// Creates a new [`Backend`].
     pub fn new(gl: &glow::Context, settings: Settings) -> Self {
-        let text_pipeline = text::Pipeline::new(gl, settings.default_font);
+        let text_pipeline = text::Pipeline::new(
+            gl,
+            settings.default_font,
+            settings.text_multithreading,
+        );
+
         let quad_pipeline = quad::Pipeline::new(gl);
         let triangle_pipeline = triangle::Pipeline::new(gl);
 

glow/src/settings.rs

@@ -16,7 +16,15 @@ pub struct Settings {
     /// By default, it will be set to 20.
     pub default_text_size: u16,
 
+    /// If enabled, spread text workload in multiple threads when multiple cores
+    /// are available.
+    ///
+    /// By default, it is disabled.
+    pub text_multithreading: bool,
+
     /// The antialiasing strategy that will be used for triangle primitives.
+    ///
+    /// By default, it is `None`.
     pub antialiasing: Option<Antialiasing>,
 }
 
@@ -25,6 +33,7 @@ impl Default for Settings {
         Settings {
             default_font: None,
             default_text_size: 20,
+            text_multithreading: false,
             antialiasing: None,
         }
     }

glow/src/text.rs

@@ -11,7 +11,11 @@ pub struct Pipeline {
 }
 
 impl Pipeline {
-    pub fn new(gl: &glow::Context, default_font: Option<&[u8]>) -> Self {
+    pub fn new(
+        gl: &glow::Context,
+        default_font: Option<&[u8]>,
+        multithreading: bool,
+    ) -> Self {
         let default_font = default_font.map(|slice| slice.to_vec());
 
         // TODO: Font customization
@@ -41,7 +45,7 @@ impl Pipeline {
         let draw_brush =
             glow_glyph::GlyphBrushBuilder::using_font(font.clone())
                 .initial_cache_size((2048, 2048))
-                .draw_cache_multithread(false) // TODO: Expose as a configuration flag
+                .draw_cache_multithread(multithreading)
                 .build(&gl);
 
         let measure_brush =