/*

    Copyright 2005-2007 Adobe Systems Incorporated

   

    Use, modification and distribution are subject to the Boost Software License,

    Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at

    http://www.boost.org/LICENSE_1_0.txt).



    See http://opensource.adobe.com/gil for most recent version including documentation.

*/



/*************************************************************************************************/



#ifndef GIL_CHANNEL_HPP

#define GIL_CHANNEL_HPP



////////////////////////////////////////////////////////////////////////////////////////

/// \file               

/// \brief Channel utilities

/// \author Lubomir Bourdev and Hailin Jin \n

///         Adobe Systems Incorporated

/// \date   2005-2007 \n Last updated on May 6, 2007

///

/// Definitions of standard GIL channel models

///

////////////////////////////////////////////////////////////////////////////////////////



#include <limits>

#include <cassert>

#include <boost/cstdint.hpp>

#include "gil_config.hpp"

#include "utilities.hpp"



namespace boost { namespace gil {





///////////////////////////////////////////

////  channel_traits

////  

////  \ingroup ChannelModel

////  \class channel_traits

////  \brief defines properties of channels, such as their range and associated types

////

////  The channel traits must be defined for every model of ChannelConcept

////  Default traits are provided. For built-in types the default traits use

////  built-in pointer and reference and the channel range is the physical 

////  range of the type. For classes, the default traits forward the associated types

////  and range to the class.

//// 

///////////////////////////////////////////



namespace detail {

    template <typename T, bool is_class> struct channel_traits_impl;



    // channel traits for custom class

    template <typename T> 

    struct channel_traits_impl<T, true> {

        typedef typename T::value_type      value_type;

        typedef typename T::reference       reference;

        typedef typename T::pointer         pointer;

        typedef typename T::const_reference const_reference;

        typedef typename T::const_pointer   const_pointer;

        BOOST_STATIC_CONSTANT(bool, is_mutable=T::is_mutable);

        static value_type min_value() { return T::min_value(); }

        static value_type max_value() { return T::max_value(); }

    };



    // channel traits implementation for built-in integral or floating point channel type

    template <typename T> 

    struct channel_traits_impl<T, false> {

        typedef T           value_type;

        typedef T&          reference;

        typedef T*          pointer;

        typedef const T&    const_reference;

        typedef T const*    const_pointer;

        BOOST_STATIC_CONSTANT(bool, is_mutable=true);

        static value_type min_value() { return (std::numeric_limits<T>::min)(); }

        static value_type max_value() { return (std::numeric_limits<T>::max)(); }

    };



    // channel traits implementation for constant built-in scalar or floating point type

    template <typename T> 

    struct channel_traits_impl<const T, false> : public channel_traits_impl<T, false> {

        typedef const T&    reference;

        typedef const T*    pointer;

        BOOST_STATIC_CONSTANT(bool, is_mutable=false);

    };

}



/**

\ingroup ChannelModel

\brief Traits for channels. Contains the following members:

\code

template <typename Channel>

struct channel_traits {

    typedef ... value_type;

    typedef ... reference;

    typedef ... pointer;

    typedef ... const_reference;

    typedef ... const_pointer;

    

    static const bool is_mutable;

    static value_type min_value();

    static value_type max_value();

};

\endcode

*/

template <typename T>

struct channel_traits : public detail::channel_traits_impl<T, is_class<T>::value> {};



// Channel traits for C++ reference type - remove the reference

template <typename T> struct channel_traits<      T&> : public channel_traits<T> {};



// Channel traits for constant C++ reference type

template <typename T> struct channel_traits<const T&> : public channel_traits<T> {

    typedef typename channel_traits<T>::const_reference reference;

    typedef typename channel_traits<T>::const_pointer   pointer;

    BOOST_STATIC_CONSTANT(bool, is_mutable=false);

};



///////////////////////////////////////////

////

////  scoped_channel_value

////

///////////////////////////////////////////



/**

\defgroup ScopedChannelValue scoped_channel_value

\ingroup ChannelModel

\brief A channel adaptor that modifies the range of the source channel. Models: ChannelValueConcept



Example:

\code

// Create a double channel with range [-0.5 .. 0.5]

struct double_minus_half  { static double apply() { return -0.5; } };

struct double_plus_half   { static double apply() { return  0.5; } };

typedef scoped_channel_value<double, double_minus_half, double_plus_half> bits64custom_t;



// channel_convert its maximum should map to the maximum

bits64custom_t x = channel_traits<bits64custom_t>::max_value();

assert(x == 0.5);

bits16 y = channel_convert<bits16>(x);

assert(y == 65535);

\endcode

*/



/// \ingroup ScopedChannelValue

/// \brief A channel adaptor that modifies the range of the source channel. Models: ChannelValueConcept

template <typename BaseChannelValue,        // base channel (models ChannelValueConcept)

          typename MinVal, typename MaxVal> // classes with a static apply() function returning the minimum/maximum channel values

struct scoped_channel_value {

    typedef scoped_channel_value    value_type;

    typedef value_type&             reference;

    typedef value_type*             pointer;

    typedef const value_type&       const_reference;

    typedef const value_type*       const_pointer;

    BOOST_STATIC_CONSTANT(bool, is_mutable=channel_traits<BaseChannelValue>::is_mutable);



    static value_type min_value() { return MinVal::apply(); }

    static value_type max_value() { return MaxVal::apply(); }



    scoped_channel_value() {}

    scoped_channel_value(const scoped_channel_value& c) : _value(c._value) {}

    scoped_channel_value(BaseChannelValue val) : _value(val) {}



    scoped_channel_value& operator++() { ++_value; return *this; }

    scoped_channel_value& operator--() { --_value; return *this; }



    scoped_channel_value operator++(int) { scoped_channel_value tmp=*this; this->operator++(); return tmp; }

    scoped_channel_value operator--(int) { scoped_channel_value tmp=*this; this->operator--(); return tmp; }



    template <typename Scalar2> scoped_channel_value& operator+=(Scalar2 v) { _value+=v; return *this; }

    template <typename Scalar2> scoped_channel_value& operator-=(Scalar2 v) { _value-=v; return *this; }

    template <typename Scalar2> scoped_channel_value& operator*=(Scalar2 v) { _value*=v; return *this; }

    template <typename Scalar2> scoped_channel_value& operator/=(Scalar2 v) { _value/=v; return *this; }



    scoped_channel_value& operator=(BaseChannelValue v) { _value=v; return *this; }

    operator BaseChannelValue() const { return _value; }

private:

    BaseChannelValue _value;

};



struct float_zero { static float apply() { return 0.0f; } };

struct float_one  { static float apply() { return 1.0f; } };





///////////////////////////////////////////

////

////  Support for sub-byte channels. These are integral channels whose value is contained in a range of bits inside an integral type

////

///////////////////////////////////////////



// It is necessary for packed channels to have their own value type. They cannot simply use an integral large enough to store the data. Here is why:

// - Any operation that requires returning the result by value will otherwise return the built-in integral type, which will have incorrect range

//   That means that after getting the value of the channel we cannot properly do channel_convert, channel_invert, etc.

// - Two channels are declared compatible if they have the same value type. That means that a packed channel is incorrectly declared compatible with an integral type

namespace detail {

    // returns the smallest fast unsigned integral type that has at least NumBits bits

    template <int NumBits>

    struct min_fast_uint : public mpl::if_c< (NumBits<=8), 

            uint_least8_t, 

            typename mpl::if_c< (NumBits<=16), 

                    uint_least16_t, 

                    typename mpl::if_c< (NumBits<=32), 

                            uint_least32_t, 

                            uintmax_t

                    >::type

            >::type

          > {};

}



/**

\defgroup PackedChannelValueModel packed_channel_value

\ingroup ChannelModel

\brief Represents the value of an unsigned integral channel operating over a bit range. Models: ChannelValueConcept

Example:

\code

// A 4-bit unsigned integral channel.

typedef packed_channel_value<4> bits4;



assert(channel_traits<bits4>::min_value()==0);

assert(channel_traits<bits4>::max_value()==15);

assert(sizeof(bits4)==1);

BOOST_STATIC_ASSERT((boost::is_integral<bits4>::value));

\endcode

*/



/// \ingroup PackedChannelValueModel

/// \brief The value of a subbyte channel. Models: ChannelValueConcept

template <int NumBits>

class packed_channel_value {

    static const std::size_t num_values = 1<<NumBits;

public:

    typedef typename detail::min_fast_uint<NumBits>::type integer_t;



    typedef packed_channel_value   value_type;

    typedef value_type&            reference;

    typedef const value_type&      const_reference;

    typedef value_type*            pointer;

    typedef const value_type*      const_pointer;



    static value_type min_value() { return value_type(0); }

    static value_type max_value() { return value_type(num_values-1); }

    BOOST_STATIC_CONSTANT(bool, is_mutable=true);



    packed_channel_value() {}

    packed_channel_value(integer_t v) : _value(v % num_values) {}

    packed_channel_value(const packed_channel_value& v) : _value(v._value) {}

    template <typename Scalar> packed_channel_value(Scalar v) : _value(integer_t(v) % num_values) {}     // suppress GCC implicit conversion warnings in channel regression file 



    operator integer_t() const { return _value; }

private:

    integer_t _value;

};



namespace detail {



template <std::size_t K>

struct static_copy_bytes {

	void operator()(const unsigned char* from, unsigned char* to) const {

		*to = *from;

		static_copy_bytes<K-1>()(++from,++to);

	}

};



template <>

struct static_copy_bytes<0> {

	void operator()(const unsigned char* from, unsigned char* to) const {}

};



template <typename Derived, typename BitField, int NumBits, bool Mutable>

class packed_channel_reference_base {

protected:

    typedef typename mpl::if_c<Mutable,void*,const void*>::type data_ptr_t;

public:

    data_ptr_t _data_ptr;   // void* pointer to the first byte of the bit range



    typedef packed_channel_value<NumBits>   value_type;

    typedef const Derived                   reference;

    typedef value_type*                     pointer;

    typedef const value_type*               const_pointer;

    BOOST_STATIC_CONSTANT(int,  num_bits=NumBits);

    BOOST_STATIC_CONSTANT(bool, is_mutable=Mutable);



    static value_type min_value()       { return channel_traits<value_type>::min_value(); }

    static value_type max_value()       { return channel_traits<value_type>::max_value(); }



    typedef BitField                       bitfield_t;

    typedef typename value_type::integer_t integer_t;



    packed_channel_reference_base(data_ptr_t data_ptr) : _data_ptr(data_ptr) {}

    packed_channel_reference_base(const packed_channel_reference_base& ref) : _data_ptr(ref._data_ptr) {}

    const Derived& operator=(integer_t v) const { set(v); return derived(); }



    const Derived& operator++() const { set(get()+1); return derived(); }

    const Derived& operator--() const { set(get()-1); return derived(); }



    Derived operator++(int) const { Derived tmp=derived(); this->operator++(); return tmp; }

    Derived operator--(int) const { Derived tmp=derived(); this->operator--(); return tmp; }



    template <typename Scalar2> const Derived& operator+=(Scalar2 v) const { set(get()+v); return derived(); }

    template <typename Scalar2> const Derived& operator-=(Scalar2 v) const { set(get()-v); return derived(); }

    template <typename Scalar2> const Derived& operator*=(Scalar2 v) const { set(get()*v); return derived(); }

    template <typename Scalar2> const Derived& operator/=(Scalar2 v) const { set(get()/v); return derived(); }



    operator integer_t() const { return get(); }

    data_ptr_t operator &() const {return _data_ptr;}

protected:

    static const integer_t max_val    = (1<<NumBits) - 1;



#ifdef GIL_NONWORD_POINTER_ALIGNMENT_SUPPORTED

	const bitfield_t& get_data()                      const { return *static_cast<const bitfield_t*>(_data_ptr); }

	void              set_data(const bitfield_t& val) const {        *static_cast<      bitfield_t*>(_data_ptr) = val; }

#else

	bitfield_t get_data() const {

		bitfield_t ret;

		static_copy_bytes<sizeof(bitfield_t) >()(gil_reinterpret_cast_c<const unsigned char*>(_data_ptr),gil_reinterpret_cast<unsigned char*>(&ret));

		return ret;

	}

	void set_data(const bitfield_t& val) const {

		static_copy_bytes<sizeof(bitfield_t) >()(gil_reinterpret_cast_c<const unsigned char*>(&val),gil_reinterpret_cast<unsigned char*>(_data_ptr));

	}

#endif



private:

    void set(integer_t value) const {     // can this be done faster??

        const integer_t num_values = max_val+1;

        this->derived().set_unsafe(((value % num_values) + num_values) % num_values); 

    }

    integer_t get() const { return derived().get(); }

    const Derived& derived() const { return static_cast<const Derived&>(*this); }

};

}   // namespace detail



/**

\defgroup PackedChannelReferenceModel packed_channel_reference

\ingroup ChannelModel

\brief Represents a reference proxy to a channel operating over a bit range whose offset is fixed at compile time. Models ChannelConcept

Example:

\code

// Reference to a 2-bit channel starting at bit 1 (i.e. the second bit)

typedef const packed_channel_reference<uint16_t,1,2,true> bits2_1_ref_t;



uint16_t data=0;

bits2_1_ref_t channel_ref(&data);

channel_ref = channel_traits<bits2_1_ref_t>::max_value();   // == 3

assert(data == 6);                                          // == 3<<1 == 6

\endcode

*/



template <typename BitField,        // A type that holds the bits of the pixel from which the channel is referenced. Typically an integral type, like boost::uint16_t

          int FirstBit, int NumBits,// Defines the sequence of bits in the data value that contain the channel 

          bool Mutable>             // true if the reference is mutable 

class packed_channel_reference;



template <typename BitField,        // A type that holds the bits of the pixel from which the channel is referenced. Typically an integral type, like boost::uint16_t

          int NumBits,              // Defines the sequence of bits in the data value that contain the channel 

          bool Mutable>             // true if the reference is mutable 

class packed_dynamic_channel_reference;



/// \ingroup PackedChannelReferenceModel

/// \brief A constant subbyte channel reference whose bit offset is fixed at compile time. Models ChannelConcept

template <typename BitField, int FirstBit, int NumBits>

class packed_channel_reference<BitField,FirstBit,NumBits,false> 

   : public detail::packed_channel_reference_base<packed_channel_reference<BitField,FirstBit,NumBits,false>,BitField,NumBits,false> {

    typedef detail::packed_channel_reference_base<packed_channel_reference<BitField,FirstBit,NumBits,false>,BitField,NumBits,false> parent_t;

    friend class packed_channel_reference<BitField,FirstBit,NumBits,true>;



    static const BitField channel_mask = parent_t::max_val<<FirstBit;

    void operator=(const packed_channel_reference&);

public:

    typedef const packed_channel_reference<BitField,FirstBit,NumBits,false> const_reference;

    typedef const packed_channel_reference<BitField,FirstBit,NumBits,true>  mutable_reference;

    typedef typename parent_t::integer_t                           integer_t;



    explicit packed_channel_reference(const void* data_ptr) : parent_t(data_ptr) {}

    packed_channel_reference(const packed_channel_reference& ref) : parent_t(ref._data_ptr) {}

    packed_channel_reference(const mutable_reference& ref) : parent_t(ref._data_ptr) {}



    unsigned first_bit() const { return FirstBit; }



    integer_t get() const { return integer_t((this->get_data()&channel_mask) >> FirstBit); }

};



/// \ingroup PackedChannelReferenceModel

/// \brief A mutable subbyte channel reference whose bit offset is fixed at compile time. Models ChannelConcept

template <typename BitField, int FirstBit, int NumBits>

class packed_channel_reference<BitField,FirstBit,NumBits,true> 

   : public detail::packed_channel_reference_base<packed_channel_reference<BitField,FirstBit,NumBits,true>,BitField,NumBits,true> {

    typedef detail::packed_channel_reference_base<packed_channel_reference<BitField,FirstBit,NumBits,true>,BitField,NumBits,true> parent_t;

    friend class packed_channel_reference<BitField,FirstBit,NumBits,false>;



    static const BitField channel_mask = parent_t::max_val<<FirstBit;

public:

    typedef const packed_channel_reference<BitField,FirstBit,NumBits,false> const_reference;

    typedef const packed_channel_reference<BitField,FirstBit,NumBits,true>  mutable_reference;

    typedef typename parent_t::integer_t                           integer_t;



    explicit packed_channel_reference(void* data_ptr) : parent_t(data_ptr) {}

    packed_channel_reference(const packed_channel_reference& ref) : parent_t(ref._data_ptr) {}



    const packed_channel_reference& operator=(integer_t value) const { assert(value<=parent_t::max_val); set_unsafe(value); return *this; }

    const packed_channel_reference& operator=(const mutable_reference& ref) const { set_from_reference(ref.get_data()); return *this; }

    const packed_channel_reference& operator=(const const_reference&   ref) const { set_from_reference(ref.get_data()); return *this; }



    template <bool Mutable1>

    const packed_channel_reference& operator=(const packed_dynamic_channel_reference<BitField,NumBits,Mutable1>& ref) const { set_unsafe(ref.get()); return *this; }



    unsigned first_bit() const { return FirstBit; }



    integer_t get()                               const { return integer_t((this->get_data()&channel_mask) >> FirstBit); }

    void set_unsafe(integer_t value)              const { this->set_data((this->get_data() & ~channel_mask) | (value<<FirstBit)); }

private:

    void set_from_reference(const BitField& other_bits) const { this->set_data((this->get_data() & ~channel_mask) | (other_bits & channel_mask)); }

};



} }  // namespace boost::gil



namespace std {

// We are forced to define swap inside std namespace because on some platforms (Visual Studio 8) STL calls swap qualified.

// swap with 'left bias': 

// - swap between proxy and anything

// - swap between value type and proxy

// - swap between proxy and proxy



/// \ingroup PackedChannelReferenceModel

/// \brief swap for packed_channel_reference

template <typename BF, int FB, int NB, bool M, typename R> inline

void swap(boost::gil::packed_channel_reference<BF,FB,NB,M> x, R& y) { 

    boost::gil::swap_proxy<typename boost::gil::packed_channel_reference<BF,FB,NB,M>::value_type>(x,y); 

}





/// \ingroup PackedChannelReferenceModel

/// \brief swap for packed_channel_reference

template <typename BF, int FB, int NB, bool M> inline

void swap(typename boost::gil::packed_channel_reference<BF,FB,NB,M>::value_type& x, boost::gil::packed_channel_reference<BF,FB,NB,M> y) { 

    boost::gil::swap_proxy<typename boost::gil::packed_channel_reference<BF,FB,NB,M>::value_type>(x,y); 

}





/// \ingroup PackedChannelReferenceModel

/// \brief swap for packed_channel_reference

template <typename BF, int FB, int NB, bool M> inline

void swap(boost::gil::packed_channel_reference<BF,FB,NB,M> x, boost::gil::packed_channel_reference<BF,FB,NB,M> y) { 

    boost::gil::swap_proxy<typename boost::gil::packed_channel_reference<BF,FB,NB,M>::value_type>(x,y); 

}

}   // namespace std



namespace boost { namespace gil {



/**

\defgroup PackedChannelDynamicReferenceModel packed_dynamic_channel_reference

\ingroup ChannelModel

\brief Represents a reference proxy to a channel operating over a bit range whose offset is specified at run time. Models ChannelConcept



Example:

\code

// Reference to a 2-bit channel whose offset is specified at construction time

typedef const packed_dynamic_channel_reference<uint8_t,2,true> bits2_dynamic_ref_t;



uint16_t data=0;

bits2_dynamic_ref_t channel_ref(&data,1);

channel_ref = channel_traits<bits2_dynamic_ref_t>::max_value();     // == 3

assert(data == 6);                                                  // == (3<<1) == 6

\endcode

*/



/// \brief Models a constant subbyte channel reference whose bit offset is a runtime parameter. Models ChannelConcept

///        Same as packed_channel_reference, except that the offset is a runtime parameter

/// \ingroup PackedChannelDynamicReferenceModel

template <typename BitField, int NumBits> 

class packed_dynamic_channel_reference<BitField,NumBits,false>

   : public detail::packed_channel_reference_base<packed_dynamic_channel_reference<BitField,NumBits,false>,BitField,NumBits,false> {

    typedef detail::packed_channel_reference_base<packed_dynamic_channel_reference<BitField,NumBits,false>,BitField,NumBits,false> parent_t;

    friend class packed_dynamic_channel_reference<BitField,NumBits,true>;



    unsigned _first_bit;     // 0..7



    void operator=(const packed_dynamic_channel_reference&);

public:

    typedef const packed_dynamic_channel_reference<BitField,NumBits,false> const_reference;

    typedef const packed_dynamic_channel_reference<BitField,NumBits,true>  mutable_reference;

    typedef typename parent_t::integer_t                          integer_t;



    packed_dynamic_channel_reference(const void* data_ptr, unsigned first_bit) : parent_t(data_ptr), _first_bit(first_bit) {}

    packed_dynamic_channel_reference(const const_reference&   ref) : parent_t(ref._data_ptr), _first_bit(ref._first_bit) {}

    packed_dynamic_channel_reference(const mutable_reference& ref) : parent_t(ref._data_ptr), _first_bit(ref._first_bit) {}



    unsigned first_bit() const { return _first_bit; }



    integer_t get() const { 

        const BitField channel_mask = parent_t::max_val<<_first_bit;

        return (this->get_data()&channel_mask) >> _first_bit; 

    }

};



/// \brief Models a mutable subbyte channel reference whose bit offset is a runtime parameter. Models ChannelConcept

///        Same as packed_channel_reference, except that the offset is a runtime parameter

/// \ingroup PackedChannelDynamicReferenceModel

template <typename BitField, int NumBits> 

class packed_dynamic_channel_reference<BitField,NumBits,true>

   : public detail::packed_channel_reference_base<packed_dynamic_channel_reference<BitField,NumBits,true>,BitField,NumBits,true> {

    typedef detail::packed_channel_reference_base<packed_dynamic_channel_reference<BitField,NumBits,true>,BitField,NumBits,true> parent_t;

    friend class packed_dynamic_channel_reference<BitField,NumBits,false>;



    unsigned _first_bit;



public:

    typedef const packed_dynamic_channel_reference<BitField,NumBits,false> const_reference;

    typedef const packed_dynamic_channel_reference<BitField,NumBits,true>  mutable_reference;

    typedef typename parent_t::integer_t                          integer_t;



    packed_dynamic_channel_reference(void* data_ptr, unsigned first_bit) : parent_t(data_ptr), _first_bit(first_bit) {}

    packed_dynamic_channel_reference(const packed_dynamic_channel_reference& ref) : parent_t(ref._data_ptr), _first_bit(ref._first_bit) {}



    const packed_dynamic_channel_reference& operator=(integer_t value) const { assert(value<=parent_t::max_val); set_unsafe(value); return *this; }

    const packed_dynamic_channel_reference& operator=(const mutable_reference& ref) const {  set_unsafe(ref.get()); return *this; }

    const packed_dynamic_channel_reference& operator=(const const_reference&   ref) const {  set_unsafe(ref.get()); return *this; }



    template <typename BitField1, int FirstBit1, bool Mutable1>

    const packed_dynamic_channel_reference& operator=(const packed_channel_reference<BitField1, FirstBit1, NumBits, Mutable1>& ref) const 

        {  set_unsafe(ref.get()); return *this; }



    unsigned first_bit() const { return _first_bit; }



    integer_t get() const { 

        const BitField channel_mask = parent_t::max_val<<_first_bit;

        return (this->get_data()&channel_mask) >> _first_bit; 

    }

    void set_unsafe(integer_t value) const { 

        const BitField channel_mask = parent_t::max_val<<_first_bit;

        this->set_data((this->get_data() & ~channel_mask) | value<<_first_bit); 

    }

};

} }  // namespace boost::gil



namespace std {

// We are forced to define swap inside std namespace because on some platforms (Visual Studio 8) STL calls swap qualified.

// swap with 'left bias': 

// - swap between proxy and anything

// - swap between value type and proxy

// - swap between proxy and proxy





/// \ingroup PackedChannelDynamicReferenceModel

/// \brief swap for packed_dynamic_channel_reference

template <typename BF, int NB, bool M, typename R> inline

void swap(boost::gil::packed_dynamic_channel_reference<BF,NB,M> x, R& y) { 

    boost::gil::swap_proxy<typename boost::gil::packed_dynamic_channel_reference<BF,NB,M>::value_type>(x,y); 

}





/// \ingroup PackedChannelDynamicReferenceModel

/// \brief swap for packed_dynamic_channel_reference

template <typename BF, int NB, bool M> inline

void swap(typename boost::gil::packed_dynamic_channel_reference<BF,NB,M>::value_type& x, boost::gil::packed_dynamic_channel_reference<BF,NB,M> y) { 

    boost::gil::swap_proxy<typename boost::gil::packed_dynamic_channel_reference<BF,NB,M>::value_type>(x,y); 

}





/// \ingroup PackedChannelDynamicReferenceModel

/// \brief swap for packed_dynamic_channel_reference

template <typename BF, int NB, bool M> inline

void swap(boost::gil::packed_dynamic_channel_reference<BF,NB,M> x, boost::gil::packed_dynamic_channel_reference<BF,NB,M> y) { 

    boost::gil::swap_proxy<typename boost::gil::packed_dynamic_channel_reference<BF,NB,M>::value_type>(x,y); 

}

}   // namespace std



namespace boost { namespace gil {

///////////////////////////////////////////

////

////  Built-in channel models

////

///////////////////////////////////////////



/// \defgroup bits8 bits8

/// \ingroup ChannelModel

/// \brief 8-bit unsigned integral channel type (typedef from uint8_t). Models ChannelValueConcept



/// \ingroup bits8

typedef uint8_t  bits8;



/// \defgroup bits16 bits16

/// \ingroup ChannelModel

/// \brief 16-bit unsigned integral channel type (typedef from uint16_t). Models ChannelValueConcept



/// \ingroup bits16

typedef uint16_t bits16;



/// \defgroup bits32 bits32

/// \ingroup ChannelModel

/// \brief 32-bit unsigned integral channel type  (typedef from uint32_t). Models ChannelValueConcept



/// \ingroup bits32

typedef uint32_t bits32;



/// \defgroup bits8s bits8s

/// \ingroup ChannelModel

/// \brief 8-bit signed integral channel type (typedef from int8_t). Models ChannelValueConcept



/// \ingroup bits8s

typedef int8_t   bits8s;



/// \defgroup bits16s bits16s

/// \ingroup ChannelModel

/// \brief 16-bit signed integral channel type (typedef from int16_t). Models ChannelValueConcept



/// \ingroup bits16s

typedef int16_t  bits16s;



/// \defgroup bits32s bits32s

/// \ingroup ChannelModel

/// \brief 32-bit signed integral channel type (typedef from int32_t). Models ChannelValueConcept



/// \ingroup bits32s

typedef int32_t  bits32s;



/// \defgroup bits32f bits32f

/// \ingroup ChannelModel

/// \brief 32-bit floating point channel type with range [0.0f ... 1.0f]. Models ChannelValueConcept



/// \ingroup bits32f

typedef scoped_channel_value<float,float_zero,float_one> bits32f;



} }  // namespace boost::gil



namespace boost {



template <int NumBits>

struct is_integral<gil::packed_channel_value<NumBits> > : public mpl::true_ {};



template <typename BitField, int FirstBit, int NumBits, bool IsMutable>

struct is_integral<gil::packed_channel_reference<BitField,FirstBit,NumBits,IsMutable> > : public mpl::true_ {};



template <typename BitField, int NumBits, bool IsMutable>

struct is_integral<gil::packed_dynamic_channel_reference<BitField,NumBits,IsMutable> > : public mpl::true_ {};



template <typename BaseChannelValue, typename MinVal, typename MaxVal> 

struct is_integral<gil::scoped_channel_value<BaseChannelValue,MinVal,MaxVal> > : public is_integral<BaseChannelValue> {};



}



#endif

