1 files changed, 35 insertions, 0 deletions
diff --git a/gfx.cpp b/gfx.cpp
index de371e17a4..0453f86e95 100644
--- a/gfx.cpp
+++ b/gfx.cpp
@@ -2359,6 +2359,41 @@ void Scumm::darkenPalette(int startColor, int endColor, int redScale, int greenS
 	}
 }
 
+void Scumm::desaturatePalette()
+{
+	// FIXME: Should this be made to take a range of colors instead?
+
+	byte *cur;
+	int i;
+
+	cur = _currentPalette;
+    
+	for (i = 0; i <= 255; i++)
+	{
+		int max, min;
+		int brightness;
+
+		// An algorithm that is good enough for The GIMP should be
+		// good enough for us...
+
+		max = (cur[0] > cur[1]) ? cur[0] : cur[1];
+		if (cur[2] > max)
+			max = cur[2];
+
+		min = (cur[0] < cur[1]) ? cur[0] : cur[1];
+		if (cur[2] < min)
+			min = cur[2];
+
+		brightness = (min + max) / 2;
+
+		*cur++ = brightness;
+		*cur++ = brightness;
+		*cur++ = brightness;
+	}
+
+	setDirtyColors(0, 255);
+}
+
 void Scumm::grabCursor(int x, int y, int w, int h)
 {
 	VirtScreen *vs = findVirtScreen(y);