增加Material Design 2主题样式的生成和导出。

color-module/src/convert/mod.rs

@@ -1,7 +1,7 @@
 use palette::{
     cam16::{Cam16Jch, Parameters},
     convert::FromColorUnclamped,
-    IsWithinBounds, Srgb,
+    Hsl, IsWithinBounds, Srgb,
 };
 
 pub fn map_cam16jch_to_srgb(origin: &Cam16Jch<f32>) -> Srgb {
@@ -24,3 +24,23 @@ pub fn map_cam16jch_to_srgb(origin: &Cam16Jch<f32>) -> Srgb {
 pub fn map_cam16jch_to_srgb_hex(origin: &Cam16Jch<f32>) -> String {
     format!("{:x}", map_cam16jch_to_srgb(origin).into_format::<u8>())
 }
+
+pub fn map_hsl_to_srgb(origin: &Hsl) -> Srgb {
+    let mut new_original = Hsl::new(origin.hue, origin.saturation, origin.lightness);
+    const FACTOR: f32 = 0.99;
+    loop {
+        let new_srgb = Srgb::from_color_unclamped(new_original);
+        if new_srgb.is_within_bounds() {
+            break new_srgb;
+        }
+        new_original = Hsl::new(
+            new_original.hue,
+            new_original.saturation * FACTOR,
+            new_original.lightness,
+        );
+    }
+}
+
+pub fn map_hsl_to_srgb_hex(origin: &Hsl) -> String {
+    format!("{:x}", map_hsl_to_srgb(origin).into_format::<u8>())
+}