From e7d9bc84854a14301ce387188a5cec93721306bc Mon Sep 17 00:00:00 2001
From: Falkreon <falkreon@gmail.com>
Date: Sat, 28 Sep 2019 08:42:06 -0500
Subject: RGB->HSL
---
.../cottonmc/cotton/gui/widget/data/Color.java | 39 ++++++++++++++++++++++
1 file changed, 39 insertions(+)
(limited to 'src/main/java/io')
diff --git a/src/main/java/io/github/cottonmc/cotton/gui/widget/data/Color.java b/src/main/java/io/github/cottonmc/cotton/gui/widget/data/Color.java
index bc985b4..3dbbe39 100644
--- a/src/main/java/io/github/cottonmc/cotton/gui/widget/data/Color.java
+++ b/src/main/java/io/github/cottonmc/cotton/gui/widget/data/Color.java
@@ -185,6 +185,41 @@ public interface Color {
this.luma = luma;
}
+ public HSL(int rgb) {
+ float r = i_f(rgb >> 16);
+ float g = i_f(rgb >> 8);
+ float b = i_f(rgb);
+
+ float max = Math.max(r, Math.max(g, b));
+ float min = Math.min(r, Math.min(g, b));
+
+ hue = 0;
+ if (max==min) {
+ hue = 0;
+ } else if (max==r) {
+ hue = (g-b)/(max-min);
+ hue *= 60f/360f;
+ } else if (max==g) {
+ hue = 2 + (b-r)/(max-min);
+ hue *= 60f/360f;
+ } else { //max==b
+ hue = 4 + (r-g)/(max-min);
+ hue *= 60f/360f;
+ }
+ if (hue<0) hue+=1;
+
+ luma = (max+min)/2f;
+
+ sat = 0;
+ if (max==0) {
+ // the saturation of black is zero, special-cased because (0-0)/0 is undefined
+ } else if (min==1) {
+ // the saturation of white is zero: (1-1)/1, special-cased for kicks I guess
+ } else {
+ sat = (max-luma) / Math.min(luma, 1-luma);
+ }
+ }
+
public int toRgb() {
float chroma = (1 - (Math.abs(2*luma - 1))) * sat;
@@ -254,6 +289,10 @@ public interface Color {
int result = (int)(f*255);
return Math.min(255,Math.max(0, result));
}
+
+ private static float i_f(int i) {
+ return (i & 0xFF) / 255f;
+ }
}
public static class LCH implements Color {
--
cgit