Second Life viewer sources 1.15.0.2

1 files changed, 50 insertions, 0 deletions

diff --git a/linden/indra/llmath/v3color.cpp b/linden/indra/llmath/v3color.cpp
index 9428093..5464a0b 100644
--- a/linden/indra/llmath/v3color.cpp
+++ b/linden/indra/llmath/v3color.cpp
@@ -4,6 +4,7 @@
  *
  * Copyright (c) 2000-2007, Linden Research, Inc.
  * 
+ * Second Life Viewer Source Code
  * The source code in this file ("Source Code") is provided by Linden Lab
  * to you under the terms of the GNU General Public License, version 2.0
  * ("GPL"), unless you have obtained a separate licensing agreement
@@ -61,3 +62,52 @@ std::ostream& operator<<(std::ostream& s, const LLColor3 &a)
         s << "{ " << a.mV[VX] << ", " << a.mV[VY] << ", " << a.mV[VZ] << " }";
         return s;
 }
+
+void LLColor3::calcHSL(F32* hue, F32* saturation, F32* luminance) const
+{
+        F32 var_R = mV[VRED];
+        F32 var_G = mV[VGREEN];
+        F32 var_B = mV[VBLUE];
+
+        F32 var_Min = ( var_R < ( var_G < var_B ? var_G : var_B ) ? var_R : ( var_G < var_B ? var_G : var_B ) );
+        F32 var_Max = ( var_R > ( var_G > var_B ? var_G : var_B ) ? var_R : ( var_G > var_B ? var_G : var_B ) );
+
+        F32 del_Max = var_Max - var_Min;
+
+        F32 L = ( var_Max + var_Min ) / 2.0f;
+        F32 H = 0.0f;
+        F32 S = 0.0f;
+
+        if ( del_Max == 0.0f )
+        {
+           H = 0.0f;
+           S = 0.0f;
+        }
+        else
+        {
+                if ( L < 0.5 )
+                        S = del_Max / ( var_Max + var_Min );
+                else
+                        S = del_Max / ( 2.0f - var_Max - var_Min );
+
+                F32 del_R = ( ( ( var_Max - var_R ) / 6.0f ) + ( del_Max / 2.0f ) ) / del_Max;
+                F32 del_G = ( ( ( var_Max - var_G ) / 6.0f ) + ( del_Max / 2.0f ) ) / del_Max;
+                F32 del_B = ( ( ( var_Max - var_B ) / 6.0f ) + ( del_Max / 2.0f ) ) / del_Max;
+
+                if ( var_R >= var_Max )
+                        H = del_B - del_G;
+                else
+                if ( var_G >= var_Max )
+                        H = ( 1.0f / 3.0f ) + del_R - del_B;
+                else
+                if ( var_B >= var_Max )
+                        H = ( 2.0f / 3.0f ) + del_G - del_R;
+
+                if ( H < 0.0f ) H += 1.0f;
+                if ( H > 1.0f ) H -= 1.0f;
+        }
+
+        if (hue) *hue = H;
+        if (saturation) *saturation = S;
+        if (luminance) *luminance = L;
+}
\ No newline at end of file