From c900c9cc82e74d50bbcb56f24271c94f34b38b81 Mon Sep 17 00:00:00 2001
From: Karl Tauber <karl@jformdesigner.com>
Date: Wed, 20 May 2020 14:49:56 +0200
Subject: [PATCH] reduce derived colors calculations

---
 .../com/formdev/flatlaf/util/DerivedColor.java  | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/util/DerivedColor.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/util/DerivedColor.java
index 83860510..798d8684 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/util/DerivedColor.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/util/DerivedColor.java
@@ -32,13 +32,28 @@ public class DerivedColor
 {
 	private final ColorFunction[] functions;
 
+	private boolean hasBaseOfDefaultColor;
+	private int baseOfDefaultColorRGB;
+
 	public DerivedColor( Color defaultColor, ColorFunction... functions ) {
 		super( (defaultColor != null) ? defaultColor : Color.red );
 		this.functions = functions;
 	}
 
 	public Color derive( Color baseColor ) {
-		return ColorFunctions.applyFunctions( baseColor, functions );
+		if( hasBaseOfDefaultColor && baseOfDefaultColorRGB == baseColor.getRGB() )
+			return this; // return default color
+
+		Color result = ColorFunctions.applyFunctions( baseColor, functions );
+
+		// if the result is equal to the default color, then the original base color
+		// was passed and we can cache this to avoid color calculations
+		if( !hasBaseOfDefaultColor && result.getRGB() == this.getRGB() ) {
+			hasBaseOfDefaultColor = true;
+			baseOfDefaultColorRGB = baseColor.getRGB();
+		}
+
+		return result;
 	}
 
 	public ColorFunction[] getFunctions() {