renderbug: split out power and RGB8 types to separate modules

src/lib8.rs

@@ -0,0 +1,44 @@
+use palette::convert::{IntoColor, IntoColorUnclamped, FromColorUnclamped};
+use palette::encoding::srgb::Srgb;
+use palette::Hsv;
+
+#[derive(PartialEq, Debug)]
+pub struct RGB8 {
+    pub red: u8,
+    pub green: u8,
+    pub blue: u8
+}
+
+impl RGB8 {
+    fn new(red : u8, green : u8, blue : u8) -> Self {
+        Self {
+            red: red,
+            green: green,
+            blue: blue
+        }
+    }
+}
+
+impl FromColorUnclamped<Hsv<Srgb, u8>> for RGB8 {
+    fn from_color_unclamped(hsv: Hsv<Srgb, u8>) -> RGB8 {
+        if hsv.saturation == 0 {
+            return RGB8::new(hsv.value, hsv.value, hsv.value);
+        }
+
+        let region = hsv.hue.into_inner() / 43;
+        let remainder = (hsv.hue.into_inner() - (region * 43)) * 6;
+
+        let p = (hsv.value.wrapping_mul(255 - hsv.saturation).wrapping_shr(8));
+        let q = (hsv.value.wrapping_mul(255 - ((hsv.saturation.wrapping_mul(remainder)).wrapping_shr(8)))).wrapping_shr(8);
+        let t = (hsv.value.wrapping_mul(255 - ((hsv.saturation.wrapping_mul(255 - remainder)).wrapping_shr(8)))).wrapping_shr(8);
+
+        match region {
+            0 => RGB8::new(hsv.value, t, p),
+            1 => RGB8::new(q, hsv.value, p),
+            2 => RGB8::new(p, hsv.value, t),
+            3 => RGB8::new(p, q, hsv.value),
+            4 => RGB8::new(t, p, hsv.value),
+            _ => RGB8::new(hsv.value, p, q)
+        }
+    }
+}