fix: doubling of shadow smoothstep lower bound for tiny skia, use int…

…o_color

tiny_skia/src/backend.rs

@@ -259,23 +259,15 @@ impl Backend {
                             );
                             let shadow_alpha = 1.0
                                 - smoothstep(
-                                    -shadow_blur_radius * scale_factor * 2.0,
+                                    -shadow_blur_radius * scale_factor,
                                     *shadow_blur_radius * scale_factor,
                                     shadow_distance,
                                 );
 
-                            tiny_skia::Color::from_rgba(
-                                // This configuration gives the correct color, but how are
-                                // the blue and red channels getting mixed up?
-                                shadow_color.b,
-                                shadow_color.g,
-                                shadow_color.r,
-                                shadow_color.a * shadow_alpha,
-                            )
-                            .map(|color| color.to_color_u8().premultiply())
-                            .unwrap_or_else(|| {
-                                tiny_skia::PremultipliedColorU8::TRANSPARENT
-                            })
+                            let mut color = into_color(*shadow_color);
+                            color.apply_opacity(shadow_alpha);
+
+                            color.to_color_u8().premultiply()
                         })
                         .collect();