color: Expose hsl/hwb to rgb functions.

I'm going to use this for color-mix() support.

Author: emilio

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cssparser"
-version = "0.29.4"
+version = "0.29.5"
 authors = [ "Simon Sapin <simon.sapin@exyr.org>" ]
 
 description = "Rust implementation of CSS Syntax Level 3"

src/color.rs

@@ -666,7 +666,7 @@ where
 
 /// https://drafts.csswg.org/css-color-4/#hwb-to-rgb
 #[inline]
-fn hwb_to_rgb(h: f32, w: f32, b: f32) -> (f32, f32, f32) {
+pub fn hwb_to_rgb(h: f32, w: f32, b: f32) -> (f32, f32, f32) {
     if w + b >= 1.0 {
         let gray = w / (w + b);
         return (gray, gray, gray);
@@ -683,15 +683,14 @@ fn hwb_to_rgb(h: f32, w: f32, b: f32) -> (f32, f32, f32) {
 /// https://drafts.csswg.org/css-color/#hsl-color
 /// except with h pre-multiplied by 3, to avoid some rounding errors.
 #[inline]
-fn hsl_to_rgb(hue: f32, saturation: f32, lightness: f32) -> (f32, f32, f32) {
+pub fn hsl_to_rgb(hue: f32, saturation: f32, lightness: f32) -> (f32, f32, f32) {
     fn hue_to_rgb(m1: f32, m2: f32, mut h3: f32) -> f32 {
         if h3 < 0. {
             h3 += 3.
         }
         if h3 > 3. {
             h3 -= 3.
         }
-
         if h3 * 2. < 1. {
             m1 + (m2 - m1) * h3 * 2.
         } else if h3 * 2. < 3. {

src/lib.rs

@@ -68,7 +68,8 @@ fn parse_border_spacing(_context: &ParserContext, input: &mut Parser)
 #![recursion_limit = "200"] // For color::parse_color_keyword
 
 pub use crate::color::{
-    parse_color_keyword, AngleOrNumber, Color, ColorComponentParser, NumberOrPercentage, RGBA,
+    hsl_to_rgb, hwb_to_rgb, parse_color_keyword, AngleOrNumber, Color, ColorComponentParser,
+    NumberOrPercentage, RGBA,
 };
 pub use crate::cow_rc_str::CowRcStr;
 pub use crate::from_bytes::{stylesheet_encoding, EncodingSupport};