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diff --git a/src/libs/dimg/dcolorcomposer.cpp b/src/libs/dimg/dcolorcomposer.cpp
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+/* ============================================================
+ *
+ * This file is a part of digiKam project
+ * http://www.digikam.org
+ *
+ * Date        : 2006-03-02
+ * Description : DColor methods for composing
+ *
+ * Copyright (C) 2006-2007 by Marcel Wiesweg <[email protected]>
+ *
+ * This program is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU General
+ * Public License as published by the Free Software Foundation;
+ * either version 2, or (at your option)
+ * any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * ============================================================ */
+
+// Integer arithmetic inspired by DirectFB,
+// src/gfx/generic/generic.c and src/display/idirectfbsurface.c:
+
+/*
+   (c) Copyright 2000-2002  convergence integrated media GmbH <[email protected]>
+   (c) Copyright 2002-2005  convergence GmbH.
+
+   All rights reserved.
+
+   Written by Denis Oliver Kropp <[email protected]>,
+              Andreas Hundt <[email protected]>,
+              Sven Neumann <[email protected]>,
+              Ville Syrj�l� <[email protected]> and
+              Claudio Ciccani <[email protected]>.
+
+*/
+
+// C++ includes.
+
+#include <cmath>
+
+// Local includes.
+
+#include "dcolorcomposer.h"
+
+namespace Digikam
+{
+
+class DColorComposerPorterDuffNone : public DColorComposer
+{
+public:
+    virtual void compose(DColor &dest, DColor src);
+};
+
+class DColorComposerPorterDuffClear : public DColorComposer
+{
+public:
+    virtual void compose(DColor &dest, DColor src);
+    virtual void compose(DColor &dest, DColor src, MultiplicationFlags multiplicationFlags);
+};
+
+class DColorComposerPorterDuffSrc : public DColorComposer
+{
+public:
+    virtual void compose(DColor &dest, DColor src);
+    virtual void compose(DColor &dest, DColor src, MultiplicationFlags multiplicationFlags);
+};
+
+class DColorComposerPorterDuffSrcOver : public DColorComposer
+{
+public:
+    virtual void compose(DColor &dest, DColor src);
+};
+
+class DColorComposerPorterDuffDstOver : public DColorComposer
+{
+public:
+    virtual void compose(DColor &dest, DColor src);
+};
+
+class DColorComposerPorterDuffSrcIn : public DColorComposer
+{
+public:
+    virtual void compose(DColor &dest, DColor src);
+};
+
+class DColorComposerPorterDuffDstIn : public DColorComposer
+{
+public:
+    virtual void compose(DColor &dest, DColor src);
+};
+
+class DColorComposerPorterDuffSrcOut : public DColorComposer
+{
+public:
+    virtual void compose(DColor &dest, DColor src);
+};
+
+class DColorComposerPorterDuffDstOut : public DColorComposer
+{
+public:
+    virtual void compose(DColor &dest, DColor src);
+};
+
+class DColorComposerPorterDuffSrcAtop : public DColorComposer
+{
+    public:
+        virtual void compose(DColor &dest, DColor src);
+};
+
+class DColorComposerPorterDuffDstAtop : public DColorComposer
+{
+    public:
+        virtual void compose(DColor &dest, DColor src);
+};
+
+class DColorComposerPorterDuffXor : public DColorComposer
+{
+    public:
+        virtual void compose(DColor &dest, DColor src);
+};
+
+// Porter-Duff None
+// component = (source * sa + destination * (1-sa))
+// Src blending function Src Alpha
+// Dst blending function Inv Src Alpha
+void DColorComposerPorterDuffNone::compose(DColor &dest, DColor src)
+{
+    // preserve src alpha value for dest blending,
+    // src.alpha() will be changed after blending src
+    int sa = src.alpha();
+    if (dest.sixteenBit())
+    {
+        src.blendAlpha16(sa);
+        dest.blendInvAlpha16(sa);
+        dest.blendAdd(src);
+        dest.blendClamp16();
+    }
+    else
+    {
+        src.blendAlpha8(sa);
+        dest.blendInvAlpha8(sa);
+        dest.blendAdd(src);
+        dest.blendClamp8();
+    }
+}
+
+// Porter-Duff Clear
+// component = (source * 0 + destination * 0)
+// Src blending function Zero
+// Dst blending function Zero
+void DColorComposerPorterDuffClear::compose(DColor &dest, DColor src)
+{
+    src.blendZero();
+    dest.blendZero();
+    dest.blendAdd(src);
+}
+
+void DColorComposerPorterDuffClear::compose(DColor &dest, DColor src, MultiplicationFlags)
+{
+    // skip pre- and demultiplication
+    compose(dest, src);
+}
+
+// Porter-Duff Src
+// Normal Painter's algorithm
+// component = (source * 1 + destination * 0)
+// Src blending function One
+// Dst blending function Zero
+void DColorComposerPorterDuffSrc::compose(DColor &dest, DColor src)
+{
+    // src: no-op
+    dest.blendZero();
+    dest.blendAdd(src);
+}
+
+void DColorComposerPorterDuffSrc::compose(DColor &dest, DColor src, MultiplicationFlags)
+{
+    // skip pre- and demultiplication
+    compose(dest, src);
+}
+
+// Porter-Duff Src Over
+// component = (source * 1 + destination * (1-sa))
+// Src blending function One
+// Dst blending function Inv Src Alpha
+void DColorComposerPorterDuffSrcOver::compose(DColor &dest, DColor src)
+{
+    if (dest.sixteenBit())
+    {
+        // src: no-op
+        dest.blendInvAlpha16(src.alpha());
+        dest.blendAdd(src);
+        dest.blendClamp16();
+    }
+    else
+    {
+        // src: no-op
+        dest.blendInvAlpha8(src.alpha());
+        dest.blendAdd(src);
+        dest.blendClamp8();
+    }
+}
+
+// Porter-Duff Dst over
+// component = (source * (1.0-da) + destination * 1)
+// Src blending function Inv Dst Alpha
+// Dst blending function One
+void DColorComposerPorterDuffDstOver::compose(DColor &dest, DColor src)
+{
+    if (dest.sixteenBit())
+    {
+        src.blendInvAlpha16(dest.alpha());
+        // dest: no-op
+        dest.blendAdd(src);
+        dest.blendClamp16();
+    }
+    else
+    {
+        src.blendInvAlpha8(dest.alpha());
+        // dest: no-op
+        dest.blendAdd(src);
+        dest.blendClamp8();
+    }
+}
+
+// Porter-Duff Src In
+// component = (source * da + destination * 0)
+// Src blending function Dst Alpha
+// Dst blending function Zero
+void DColorComposerPorterDuffSrcIn::compose(DColor &dest, DColor src)
+{
+    if (dest.sixteenBit())
+    {
+        src.blendAlpha16(dest.alpha());
+        dest.blendZero();
+        dest.blendAdd(src);
+        dest.blendClamp16();
+    }
+    else
+    {
+        src.blendAlpha8(dest.alpha());
+        dest.blendZero();
+        dest.blendAdd(src);
+        dest.blendClamp8();
+    }
+}
+
+// Porter-Duff Dst In
+// component = (source * 0 + destination * sa)
+// Src blending function Zero
+// Dst blending function Src Alpha
+void DColorComposerPorterDuffDstIn::compose(DColor &dest, DColor src)
+{
+    int sa = src.alpha();
+    if (dest.sixteenBit())
+    {
+        src.blendZero();
+        dest.blendAlpha16(sa);
+        dest.blendAdd(src);
+        dest.blendClamp16();
+    }
+    else
+    {
+        src.blendZero();
+        dest.blendAlpha8(sa);
+        dest.blendAdd(src);
+        dest.blendClamp8();
+    }
+}
+
+// Porter-Duff Src Out
+// component = (source * (1-da) + destination * 0)
+// Src blending function Inv Dst Alpha
+// Dst blending function Zero
+void DColorComposerPorterDuffSrcOut::compose(DColor &dest, DColor src)
+{
+    if (dest.sixteenBit())
+    {
+        src.blendInvAlpha16(dest.alpha());
+        dest.blendZero();
+        dest.blendAdd(src);
+        dest.blendClamp16();
+    }
+    else
+    {
+        src.blendInvAlpha8(dest.alpha());
+        dest.blendZero();
+        dest.blendAdd(src);
+        dest.blendClamp8();
+    }
+}
+
+// Porter-Duff Dst Out
+// component = (source * 0 + destination * (1-sa))
+// Src blending function Zero
+// Dst blending function Inv Src Alpha
+void DColorComposerPorterDuffDstOut::compose(DColor &dest, DColor src)
+{
+    int sa = src.alpha();
+    if (dest.sixteenBit())
+    {
+        src.blendZero();
+        dest.blendInvAlpha16(sa);
+        dest.blendAdd(src);
+        dest.blendClamp16();
+    }
+    else
+    {
+        src.blendZero();
+        dest.blendInvAlpha8(sa);
+        dest.blendAdd(src);
+        dest.blendClamp8();
+    }
+}
+
+// Porter-Duff Src Atop
+// component = (source * da + destination * (1-sa))
+// Src blending function Dst Alpha
+// Dst blending function Inv Src Alpha
+void DColorComposerPorterDuffSrcAtop::compose(DColor &dest, DColor src)
+{
+    int sa = src.alpha();
+    if (dest.sixteenBit())
+    {
+        src.blendAlpha16(dest.alpha());
+        dest.blendInvAlpha16(sa);
+        dest.blendAdd(src);
+        dest.blendClamp16();
+    }
+    else
+    {
+        src.blendAlpha8(dest.alpha());
+        dest.blendInvAlpha8(sa);
+        dest.blendAdd(src);
+        dest.blendClamp8();
+    }
+}
+
+// Porter-Duff Dst Atop
+// component = (source * (1-da) + destination * sa)
+// Src blending function Inv Dest Alpha
+// Dst blending function Src Alpha
+void DColorComposerPorterDuffDstAtop::compose(DColor &dest, DColor src)
+{
+    int sa = src.alpha();
+    if (dest.sixteenBit())
+    {
+        src.blendInvAlpha16(dest.alpha());
+        dest.blendAlpha16(sa);
+        dest.blendAdd(src);
+        dest.blendClamp16();
+    }
+    else
+    {
+        src.blendInvAlpha8(dest.alpha());
+        dest.blendInvAlpha8(sa);
+        dest.blendAdd(src);
+        dest.blendClamp8();
+    }
+}
+
+// Porter-Duff Xor
+// component = (source * (1-da) + destination * (1-sa))
+// Src blending function Inv Dst Alpha
+// Dst blending function Inv Src Alpha
+void DColorComposerPorterDuffXor::compose(DColor &dest, DColor src)
+{
+    int sa = src.alpha();
+    if (dest.sixteenBit())
+    {
+        src.blendInvAlpha16(dest.alpha());
+        dest.blendInvAlpha16(sa);
+        dest.blendAdd(src);
+        dest.blendClamp16();
+    }
+    else
+    {
+        src.blendInvAlpha8(dest.alpha());
+        dest.blendInvAlpha8(sa);
+        dest.blendAdd(src);
+        dest.blendClamp8();
+    }
+}
+
+// -----------------------------------------------------------------------
+
+void DColorComposer::compose(DColor &dest, DColor src, DColorComposer::MultiplicationFlags multiplicationFlags)
+{
+    if (multiplicationFlags & PremultiplySrc)
+        src.premultiply();
+    if (multiplicationFlags & PremultiplyDst)
+        dest.premultiply();
+
+    compose(dest, src);
+
+    if (multiplicationFlags & DemultiplyDst)
+        dest.demultiply();
+}
+
+DColorComposer *DColorComposer::getComposer(DColorComposer::CompositingOperation rule)
+{
+    switch(rule)
+    {
+        case PorterDuffNone:
+            return new DColorComposerPorterDuffNone;
+        case PorterDuffClear:
+            return new DColorComposerPorterDuffClear;
+        case PorterDuffSrc:
+            return new DColorComposerPorterDuffSrc;
+        case PorterDuffSrcOver:
+            return new DColorComposerPorterDuffSrcOver;
+        case PorterDuffDstOver:
+            return new DColorComposerPorterDuffDstOver;
+        case PorterDuffSrcIn:
+            return new DColorComposerPorterDuffSrcIn;
+        case PorterDuffDstIn:
+            return new DColorComposerPorterDuffDstIn;
+        case PorterDuffSrcOut:
+            return new DColorComposerPorterDuffSrcOut;
+        case PorterDuffDstOut:
+            return new DColorComposerPorterDuffDstOut;
+        case PorterDuffSrcAtop:
+            return new DColorComposerPorterDuffDstOut;
+        case PorterDuffDstAtop:
+            return new DColorComposerPorterDuffDstOut;
+        case PorterDuffXor:
+            return new DColorComposerPorterDuffDstOut;
+    }
+    return 0;
+}
+
+}  // namespace DigiKam