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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 <marcel.wiesweg@gmx.de>
*
* 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 <curanz@convergence.de>
(c) Copyright 2002-2005 convergence GmbH.
All rights reserved.
Written by Denis Oliver Kropp <dok@directfb.org>,
Andreas Hundt <andi@fischlustig.de>,
Sven Neumann <neo@directfb.org>,
Ville Syrj�l� <syrjala@sci.fi> and
Claudio Ciccani <klan@users.sf.net>.
*/
// 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
|
