feat: expose draw_cache_multithread

Cargo.toml

@@ -25,6 +25,8 @@ canvas = ["iced_wgpu/canvas"]
 qr_code = ["iced_wgpu/qr_code"]
 # Enables using system fonts
 default_system_font = ["iced_wgpu/default_system_font"]
+# Enables draw_cache_multithread for glyph drawing
+glyph_draw_cache_multithread = ["iced_wgpu/glyph_draw_cache_multithread"]
 # Enables the `iced_glow` renderer. Overrides `iced_wgpu`
 glow = ["iced_glow", "iced_glutin"]
 # Enables the `Canvas` widget for `iced_glow`
@@ -33,6 +35,8 @@ glow_canvas = ["iced_glow/canvas"]
 glow_qr_code = ["iced_glow/qr_code"]
 # Enables using system fonts for `iced_glow`
 glow_default_system_font = ["iced_glow/default_system_font"]
+# Enables draw_cache_multithread for `iced_glow` glyph drawing
+glow_glyph_draw_cache_multithread = ["iced_glow/glyph_draw_cache_multithread"]
 # Enables a debug view in native platforms (press F12)
 debug = ["iced_winit/debug"]
 # Enables `tokio` as the `executor::Default` on native platforms

glow/Cargo.toml

@@ -11,6 +11,7 @@ repository = "https://github.com/hecrj/iced"
 canvas = ["iced_graphics/canvas"]
 qr_code = ["iced_graphics/qr_code"]
 default_system_font = ["iced_graphics/font-source"]
+glyph_draw_cache_multithread = []
 # Not supported yet!
 image = []
 svg = []

glow/src/text.rs

@@ -41,7 +41,9 @@ 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(cfg!(
+                    feature = "glyph_draw_cache_multithread"
+                ))
                 .build(&gl);
 
         let measure_brush =

wgpu/Cargo.toml

@@ -24,6 +24,7 @@ farbfeld = ["image_rs/farbfeld"]
 canvas = ["iced_graphics/canvas"]
 qr_code = ["iced_graphics/qr_code"]
 default_system_font = ["iced_graphics/font-source"]
+glyph_draw_cache_multithread = []
 
 [dependencies]
 wgpu = "0.8"

wgpu/src/text.rs

@@ -46,7 +46,9 @@ impl Pipeline {
         let draw_brush =
             wgpu_glyph::GlyphBrushBuilder::using_font(font.clone())
                 .initial_cache_size((2048, 2048))
-                .draw_cache_multithread(false) // TODO: Expose as a configuration flag
+                .draw_cache_multithread(cfg!(
+                    feature = "glyph_draw_cache_multithread"
+                ))
                 .build(device, format);
 
         let measure_brush =