/* | |
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://stlab.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); | |
typedef BaseChannelValue base_channel_t; | |
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 | |
> {}; | |
template <int NumBits> | |
struct num_value_fn : public mpl::if_c< ( NumBits < 32 ) | |
, uint32_t | |
, uint64_t | |
> {}; | |
template <int NumBits> | |
struct max_value_fn : public mpl::if_c< ( NumBits <= 32 ) | |
, uint32_t | |
, uint64_t | |
> {}; | |
} | |
/** | |
\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 { | |
typedef typename detail::num_value_fn< NumBits >::type num_value_t; | |
static const num_value_t num_values = static_cast< num_value_t >( 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 = static_cast< integer_t >( v % num_values ); } | |
packed_channel_value(const packed_channel_value& v) : _value(v._value) {} | |
template <typename Scalar> packed_channel_value(Scalar v) { _value = static_cast< integer_t >( v ) % num_values; } | |
static unsigned int num_bits() { return NumBits; } | |
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* , unsigned char*) 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: | |
typedef typename detail::num_value_fn< NumBits >::type num_value_t; | |
typedef typename detail::max_value_fn< NumBits >::type max_value_t; | |
static const num_value_t num_values = static_cast< num_value_t >( 1 ) << NumBits ; | |
static const max_value_t max_val = static_cast< max_value_t >( num_values - 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 = static_cast< BitField >( 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 = static_cast< BitField >( 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) | (( static_cast< BitField >( 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(const 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, const 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(const boost::gil::packed_channel_reference<BF,FB,NB,M> x, const 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 = static_cast< integer_t >( parent_t::max_val ) <<_first_bit; | |
return static_cast< integer_t >(( 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 = static_cast< integer_t >( parent_t::max_val ) << _first_bit; | |
return static_cast< integer_t >(( this->get_data()&channel_mask ) >> _first_bit ); | |
} | |
void set_unsafe(integer_t value) const { | |
const BitField channel_mask = static_cast< integer_t >( 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(const 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, const 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(const boost::gil::packed_dynamic_channel_reference<BF,NB,M> x, const 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 |