--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/skins/AknSkins/rlpluginsrc/AknsRlEffectUtil.cpp	Thu Dec 17 09:14:12 2009 +0200
@@ -0,0 +1,169 @@
+/*
+* Copyright (c) 2005-2008 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:  Utility class for effects.
+*
+*/
+
+
+// INCLUDE FILES
+#include <e32base.h>
+
+#include "AknsRlEffectUtil.h"
+
+// ============================ MEMBER FUNCTIONS ===============================
+
+// -----------------------------------------------------------------------------
+// AknsRlUtil::Median9
+// -----------------------------------------------------------------------------
+//
+#define AKNS_RL_EFFECT_SORT(a, b) { if((a) > (b)) { temp=(a); (a) = (b); (b) = temp; } }
+TUint8 AknsRlUtil::Median9( TUint8 aArray[9] )
+    {
+    TUint8 temp; // Defined for AKNS_RL_EFFECT_SORT macro
+    AKNS_RL_EFFECT_SORT(aArray[1], aArray[2]); AKNS_RL_EFFECT_SORT(aArray[4], aArray[5]); AKNS_RL_EFFECT_SORT(aArray[7], aArray[8]);
+    AKNS_RL_EFFECT_SORT(aArray[0], aArray[1]); AKNS_RL_EFFECT_SORT(aArray[3], aArray[4]); AKNS_RL_EFFECT_SORT(aArray[6], aArray[7]);
+    AKNS_RL_EFFECT_SORT(aArray[1], aArray[2]); AKNS_RL_EFFECT_SORT(aArray[4], aArray[5]); AKNS_RL_EFFECT_SORT(aArray[7], aArray[8]);
+    AKNS_RL_EFFECT_SORT(aArray[0], aArray[3]); AKNS_RL_EFFECT_SORT(aArray[5], aArray[8]); AKNS_RL_EFFECT_SORT(aArray[4], aArray[7]);
+    AKNS_RL_EFFECT_SORT(aArray[3], aArray[6]); AKNS_RL_EFFECT_SORT(aArray[1], aArray[4]); AKNS_RL_EFFECT_SORT(aArray[2], aArray[5]);
+    AKNS_RL_EFFECT_SORT(aArray[4], aArray[7]); AKNS_RL_EFFECT_SORT(aArray[4], aArray[2]); AKNS_RL_EFFECT_SORT(aArray[6], aArray[4]);
+    AKNS_RL_EFFECT_SORT(aArray[4], aArray[2]);
+
+    return(aArray[4]);
+    }
+
+// -----------------------------------------------------------------------------
+// AknsRlChannelBlend::Blend
+// -----------------------------------------------------------------------------
+//
+TUint8 AknsRlChannelBlend::Blend( const TAknsRlChannelBlendMode aMode,
+                                  const TInt aFactor,
+                                  const TUint8 aA,
+                                  const TUint8 aB )
+    {
+    // Some calculations will result in negative values, res must be signed
+    TInt res = 0;
+
+    // Note: It is assumed that arithmetic shifting is supported
+    // -> negative values are shifted correctly
+
+    switch(aMode)
+        {
+        case EAknsRlChannelBlendNormal:
+            {
+            res = aB;
+            }
+            break;
+        case EAknsRlChannelBlendDarken:
+            {
+            if( aA < aB )
+                res = aA;
+            else
+                res = aB;
+            }
+            break;
+        case EAknsRlChannelBlendLighten:
+            {
+            if( aA > aB )
+                res = aA;
+            else
+                res = aB;
+            }
+            break;
+        case EAknsRlChannelBlendMultiply:
+            {
+            res = ( aA * aB ) >> 8;
+            }
+            break;
+        case EAknsRlChannelBlendScreen:
+            {
+            res = 255 - ((( 255 - aA ) * ( 255 - aB )) >> 8 ); //lint !e702 Arithmetic shifting assumed
+            }
+            break;
+        case EAknsRlChannelBlendOverlay:
+            {
+            if( aA < 127 )
+                res = 2 * (( aA * aB ) >> 8);
+            else
+                res = 255 - 2 * ((( 255 - aA ) * ( 255 - aB )) >> 8 ); //lint !e702 Arithmetic shifting assumed
+            }
+            break;
+        case EAknsRlChannelBlendHardLight:
+            {
+            if( aB < 127 )
+                res = 2 * (( aA * aB ) >> 8 );
+            else
+                res = 255 - 2 * ((( 255 - aA ) * ( 255 - aB )) >> 8 ); //lint !e702 Arithmetic shifting assumed
+            }
+            break;
+        case EAknsRlChannelBlendSoftLight:
+            {
+            res = 2 * (( aA * aB ) >> 8 ) + (( aA * aA ) >> 8 ) - 2 * (( aA * (( aA * aB ) >> 8 )) >> 8 ); //lint !e702 Arithmetic shifting assumed
+            }
+            break;
+        case EAknsRlChannelBlendDifference:
+            {
+            res = aA - aB;
+            if( res < 0 )
+                res = -res;
+            }
+            break;
+        case EAknsRlChannelBlendDodge:
+            {
+            if( 255 == aB )
+                res = 255;
+            else
+                {
+                res = ( aA << 8 ) / ( 255 - aB );
+
+                // Do clamping here to prevent artefacts in blending
+                if( res < 0 )
+                    res = 0;
+                if( res > 255 )
+                    res = 255;
+                }
+            }
+            break;
+        case EAknsRlChannelBlendBurn:
+            {
+            if( 0 == aB )
+                res = 0; // This makes burn work as in Paint Shop Pro
+            else
+                {
+                res = 255 - ((( 255 - aA ) << 8 ) / aB );
+
+                // Do clamping here to prevent artefacts in blending
+                if( res < 0 )
+                    res = 0;
+                if( res > 255 )
+                    res = 255;
+                }
+            }
+            break;
+        default:
+            break;
+        }
+
+    // Blend between result and the original value
+    res = ( res * aFactor + ( 255 - aFactor ) * aA ) >> 8; //lint !e702 Arithmetic shifting assumed
+
+    // Clamp the result to range [0, 255]
+    if( res < 0 )
+        return 0;
+    if( res > 255 )
+        return 255;
+
+    return TUint8(res);
+    }
+
+// End of file.