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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: truecolormaskaccessor.hxx,v $
* $Revision: 1.2 $
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#ifndef INCLUDED_BASEBMP_TRUECOLORMASKACCESSOR_HXX
#define INCLUDED_BASEBMP_TRUECOLORMASKACCESSOR_HXX
#include <basebmp/colortraits.hxx>
#include <basebmp/accessortraits.hxx>
#include <basebmp/metafunctions.hxx>
#include <basebmp/endian.hxx>
#include <vigra/numerictraits.hxx>
#include <vigra/metaprogramming.hxx>
namespace basebmp
{
namespace
{
/// Shift left for positive shift value, and right otherwise
template< typename T > inline T shiftLeft( T v, int shift )
{
return shift > 0 ? v << shift : v >> (-shift);
}
/// Shift right for positive shift value, and left otherwise
template< typename T > inline T shiftRight( T v, int shift )
{
return shift > 0 ? v >> shift : v << (-shift);
}
}
/** Access true color data, which is pixel-packed into a POD.
@tpl Accessor
Wrapped accessor, used to access the actual pixel values
@tpl ColorType
Underlying color type, to convert the pixel values into
@tpl RedMask
Bitmask, to access the red bits in the data type
@tpl GreenMask
Bitmask, to access the green bits in the data type
@tpl BlueMask
Bitmask, to access the blue bits in the data type
@tpl SwapBytes
When true, the final pixel values will be byte-swapped before
passed to/from the iterator.
*/
template< class Accessor,
typename ColorType,
int RedMask,
int GreenMask,
int BlueMask,
bool SwapBytes > class TrueColorMaskAccessor
{
public:
typedef typename Accessor::value_type data_type;
typedef ColorType value_type;
typedef typename make_unsigned<data_type>::type unsigned_data_type;
typedef typename ColorTraits<ColorType>::component_type component_type;
#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
// making all members public, if no member template friends
private:
template<class A, typename C, int R, int G, int B, bool S> friend class TrueColorMaskAccessor;
#endif
Accessor maAccessor;
public:
// calc corrective shifts for all three channels in advance
enum {
red_shift = numberOfTrailingZeros<RedMask>::value,
green_shift = numberOfTrailingZeros<GreenMask>::value,
blue_shift = numberOfTrailingZeros<BlueMask>::value,
red_bits = bitcount<RedMask>::value,
green_bits = bitcount<GreenMask>::value,
blue_bits = bitcount<BlueMask>::value
};
// -------------------------------------------------------
TrueColorMaskAccessor() :
maAccessor()
{}
template< class A > explicit
TrueColorMaskAccessor( TrueColorMaskAccessor< A,
ColorType,
RedMask,
GreenMask,
BlueMask,
SwapBytes > const& rSrc ) :
maAccessor( rSrc.maAccessor )
{}
template< class T > explicit TrueColorMaskAccessor( T accessor ) :
maAccessor(accessor)
{}
// -------------------------------------------------------
Accessor const& getWrappedAccessor() const { return maAccessor; }
Accessor& getWrappedAccessor() { return maAccessor; }
// -------------------------------------------------------
value_type toValue( unsigned_data_type v ) const
{
v = SwapBytes ? byteSwap(v) : v;
const unsigned_data_type red (v & RedMask);
const unsigned_data_type green(v & GreenMask);
const unsigned_data_type blue (v & BlueMask);
value_type res( (shiftRight(red,
red_shift-8*sizeof(component_type)+red_bits)) |
(shiftRight(red,
red_shift-8*sizeof(component_type)+2*red_bits)),
(shiftRight(green,
green_shift-8*sizeof(component_type)+green_bits)) |
(shiftRight(green,
green_shift-8*sizeof(component_type)+2*green_bits)),
(shiftRight(blue,
blue_shift-8*sizeof(component_type)+blue_bits)) |
(shiftRight(blue,
blue_shift-8*sizeof(component_type)+2*blue_bits)) );
return res;
}
data_type toPacked( value_type v ) const
{
const unsigned_data_type red (v.getRed());
const unsigned_data_type green(v.getGreen());
const unsigned_data_type blue (v.getBlue());
unsigned_data_type res(
(shiftLeft(red,
red_shift-8*sizeof(component_type)+red_bits) & RedMask) |
(shiftLeft(green,
green_shift-8*sizeof(component_type)+green_bits) & GreenMask) |
(shiftLeft(blue,
blue_shift-8*sizeof(component_type)+blue_bits) & BlueMask) );
return SwapBytes ? byteSwap(res) : res;
}
// -------------------------------------------------------
template< class Iterator >
value_type operator()(Iterator const& i) const
{
return toValue(
unsigned_cast<data_type>( maAccessor(i)) );
}
template< class Iterator, class Difference >
value_type operator()(Iterator const& i, Difference const& diff) const
{
return toValue(
unsigned_cast<data_type>( maAccessor(i,diff)) );
}
// -------------------------------------------------------
template< typename V, class Iterator >
void set(V const& value, Iterator const& i) const
{
maAccessor.set(
toPacked(
vigra::detail::RequiresExplicitCast<value_type>::cast(
value) ),
i);
}
template< typename V, class Iterator, class Difference >
void set(V const& value, Iterator const& i, Difference const& diff) const
{
maAccessor.set(
toPacked(
vigra::detail::RequiresExplicitCast<value_type>::cast(
value)),
i,
diff );
}
};
//-----------------------------------------------------------------------------
/** Convert Color to packed true color value for TrueColorMaskAccessor
*/
template< class Accessor > struct ColorConvert
{
typename Accessor::data_type operator()( const Accessor& acc,
typename Accessor::value_type v )
{
return acc.toPacked(v);
}
};
//-----------------------------------------------------------------------------
// partial specialization for TrueColorMaskAccessor
template< class Accessor,
typename ColorType,
int RedMask,
int GreenMask,
int BlueMask,
bool SwapBytes > struct AccessorTraits<
TrueColorMaskAccessor< Accessor,
ColorType,
RedMask,
GreenMask,
BlueMask,
SwapBytes > >
{
/// value type of described accessor
typedef typename TrueColorMaskAccessor< Accessor,
ColorType,
RedMask,
GreenMask,
BlueMask,
SwapBytes >::value_type value_type;
/// Retrieve stand-alone color lookup function for given Accessor type
typedef ColorConvert< TrueColorMaskAccessor< Accessor,
ColorType,
RedMask,
GreenMask,
BlueMask,
SwapBytes > > color_lookup;
/// Retrieve raw pixel data accessor for given Accessor type
typedef Accessor raw_accessor;
/** accessor for XOR setter access is disabled, since the results
* are usually completely unintended - you'll usually want to
* wrap an xor_accessor with a TrueColorMaskAccessor, not the
* other way around.
*/
typedef vigra::VigraFalseType xor_accessor;
/** accessor for masked setter access is disabled, since the
* results are usually completely unintended - you'll usually
* want to wrap a masked_accessor with a TrueColorMaskAccessor,
* not the other way around.
*/
template< class MaskAccessor,
class Iterator,
class MaskIterator > struct masked_accessor
{
typedef vigra::VigraFalseType type;
};
};
} // namespace basebmp
#endif /* INCLUDED_BASEBMP_TRUECOLORMASKACCESSOR_HXX */
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