Current File : //usr/include/OpenEXR/ImfChannelList.h
///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
//
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///////////////////////////////////////////////////////////////////////////
#ifndef INCLUDED_IMF_CHANNEL_LIST_H
#define INCLUDED_IMF_CHANNEL_LIST_H
//-----------------------------------------------------------------------------
//
// class Channel
// class ChannelList
//
//-----------------------------------------------------------------------------
#include "ImfName.h"
#include "ImfPixelType.h"
#include "ImfNamespace.h"
#include "ImfExport.h"
#include <map>
#include <set>
#include <string>
OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER
struct IMF_EXPORT Channel
{
//------------------------------
// Data type; see ImfPixelType.h
//------------------------------
PixelType type;
//--------------------------------------------
// Subsampling: pixel (x, y) is present in the
// channel only if
//
// x % xSampling == 0 && y % ySampling == 0
//
//--------------------------------------------
int xSampling;
int ySampling;
//--------------------------------------------------------------
// Hint to lossy compression methods that indicates whether
// human perception of the quantity represented by this channel
// is closer to linear or closer to logarithmic. Compression
// methods may optimize image quality by adjusting pixel data
// quantization acording to this hint.
// For example, perception of red, green, blue and luminance is
// approximately logarithmic; the difference between 0.1 and 0.2
// is perceived to be roughly the same as the difference between
// 1.0 and 2.0. Perception of chroma coordinates tends to be
// closer to linear than logarithmic; the difference between 0.1
// and 0.2 is perceived to be roughly the same as the difference
// between 1.0 and 1.1.
//--------------------------------------------------------------
bool pLinear;
//------------
// Constructor
//------------
Channel (PixelType type = HALF,
int xSampling = 1,
int ySampling = 1,
bool pLinear = false);
//------------
// Operator ==
//------------
bool operator == (const Channel &other) const;
};
class IMF_EXPORT ChannelList
{
public:
//--------------
// Add a channel
//--------------
void insert (const char name[],
const Channel &channel);
void insert (const std::string &name,
const Channel &channel);
//------------------------------------------------------------------
// Access to existing channels:
//
// [n] Returns a reference to the channel with name n.
// If no channel with name n exists, an IEX_NAMESPACE::ArgExc
// is thrown.
//
// findChannel(n) Returns a pointer to the channel with name n,
// or 0 if no channel with name n exists.
//
//------------------------------------------------------------------
Channel & operator [] (const char name[]);
const Channel & operator [] (const char name[]) const;
Channel & operator [] (const std::string &name);
const Channel & operator [] (const std::string &name) const;
Channel * findChannel (const char name[]);
const Channel * findChannel (const char name[]) const;
Channel * findChannel (const std::string &name);
const Channel * findChannel (const std::string &name) const;
//-------------------------------------------
// Iterator-style access to existing channels
//-------------------------------------------
typedef std::map <Name, Channel> ChannelMap;
class Iterator;
class ConstIterator;
Iterator begin ();
ConstIterator begin () const;
Iterator end ();
ConstIterator end () const;
Iterator find (const char name[]);
ConstIterator find (const char name[]) const;
Iterator find (const std::string &name);
ConstIterator find (const std::string &name) const;
//-----------------------------------------------------------------
// Support for image layers:
//
// In an image file with many channels it is sometimes useful to
// group the channels into "layers", that is, into sets of channels
// that logically belong together. Grouping channels into layers
// is done using a naming convention: channel C in layer L is
// called "L.C".
//
// For example, a computer graphic image may contain separate
// R, G and B channels for light that originated at each of
// several different virtual light sources. The channels in
// this image might be called "light1.R", "light1.G", "light1.B",
// "light2.R", "light2.G", "light2.B", etc.
//
// Note that this naming convention allows layers to be nested;
// for example, "light1.specular.R" identifies the "R" channel
// in the "specular" sub-layer of layer "light1".
//
// Channel names that don't contain a "." or that contain a
// "." only at the beginning or at the end are not considered
// to be part of any layer.
//
// layers(lns) sorts the channels in this ChannelList
// into layers and stores the names of
// all layers, sorted alphabetically,
// into string set lns.
//
// channelsInLayer(ln,f,l) stores a pair of iterators in f and l
// such that the loop
//
// for (ConstIterator i = f; i != l; ++i)
// ...
//
// iterates over all channels in layer ln.
// channelsInLayer (ln, l, p) calls
// channelsWithPrefix (ln + ".", l, p).
//
//-----------------------------------------------------------------
void layers (std::set <std::string> &layerNames) const;
void channelsInLayer (const std::string &layerName,
Iterator &first,
Iterator &last);
void channelsInLayer (const std::string &layerName,
ConstIterator &first,
ConstIterator &last) const;
//-------------------------------------------------------------------
// Find all channels whose name begins with a given prefix:
//
// channelsWithPrefix(p,f,l) stores a pair of iterators in f and l
// such that the following loop iterates over all channels whose name
// begins with string p:
//
// for (ConstIterator i = f; i != l; ++i)
// ...
//
//-------------------------------------------------------------------
void channelsWithPrefix (const char prefix[],
Iterator &first,
Iterator &last);
void channelsWithPrefix (const char prefix[],
ConstIterator &first,
ConstIterator &last) const;
void channelsWithPrefix (const std::string &prefix,
Iterator &first,
Iterator &last);
void channelsWithPrefix (const std::string &prefix,
ConstIterator &first,
ConstIterator &last) const;
//------------
// Operator ==
//------------
bool operator == (const ChannelList &other) const;
private:
ChannelMap _map;
};
//----------
// Iterators
//----------
class ChannelList::Iterator
{
public:
Iterator ();
Iterator (const ChannelList::ChannelMap::iterator &i);
Iterator & operator ++ ();
Iterator operator ++ (int);
const char * name () const;
Channel & channel () const;
private:
friend class ChannelList::ConstIterator;
ChannelList::ChannelMap::iterator _i;
};
class ChannelList::ConstIterator
{
public:
ConstIterator ();
ConstIterator (const ChannelList::ChannelMap::const_iterator &i);
ConstIterator (const ChannelList::Iterator &other);
ConstIterator & operator ++ ();
ConstIterator operator ++ (int);
const char * name () const;
const Channel & channel () const;
private:
friend bool operator == (const ConstIterator &, const ConstIterator &);
friend bool operator != (const ConstIterator &, const ConstIterator &);
ChannelList::ChannelMap::const_iterator _i;
};
//-----------------
// Inline Functions
//-----------------
inline
ChannelList::Iterator::Iterator (): _i()
{
// empty
}
inline
ChannelList::Iterator::Iterator (const ChannelList::ChannelMap::iterator &i):
_i (i)
{
// empty
}
inline ChannelList::Iterator &
ChannelList::Iterator::operator ++ ()
{
++_i;
return *this;
}
inline ChannelList::Iterator
ChannelList::Iterator::operator ++ (int)
{
Iterator tmp = *this;
++_i;
return tmp;
}
inline const char *
ChannelList::Iterator::name () const
{
return *_i->first;
}
inline Channel &
ChannelList::Iterator::channel () const
{
return _i->second;
}
inline
ChannelList::ConstIterator::ConstIterator (): _i()
{
// empty
}
inline
ChannelList::ConstIterator::ConstIterator
(const ChannelList::ChannelMap::const_iterator &i): _i (i)
{
// empty
}
inline
ChannelList::ConstIterator::ConstIterator (const ChannelList::Iterator &other):
_i (other._i)
{
// empty
}
inline ChannelList::ConstIterator &
ChannelList::ConstIterator::operator ++ ()
{
++_i;
return *this;
}
inline ChannelList::ConstIterator
ChannelList::ConstIterator::operator ++ (int)
{
ConstIterator tmp = *this;
++_i;
return tmp;
}
inline const char *
ChannelList::ConstIterator::name () const
{
return *_i->first;
}
inline const Channel &
ChannelList::ConstIterator::channel () const
{
return _i->second;
}
inline bool
operator == (const ChannelList::ConstIterator &x,
const ChannelList::ConstIterator &y)
{
return x._i == y._i;
}
inline bool
operator != (const ChannelList::ConstIterator &x,
const ChannelList::ConstIterator &y)
{
return !(x == y);
}
OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT
#endif
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