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ImfHeader.h

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// *       Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// *       Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// *       Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission. 
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
///////////////////////////////////////////////////////////////////////////



#ifndef INCLUDED_IMF_HEADER_H
#define INCLUDED_IMF_HEADER_H

//-----------------------------------------------------------------------------
//
//    class Header
//
//-----------------------------------------------------------------------------

#include <ImfLineOrder.h>
#include <ImfCompression.h>
#include <ImfName.h>
#include <ImfTileDescription.h>
#include <ImfInt64.h>
#include "ImathVec.h"
#include "ImathBox.h"
#include "IexBaseExc.h"
#include <map>
#include <iosfwd>

namespace Imf {


class Attribute;
class ChannelList;
class IStream;
class OStream;
class PreviewImage;


class Header
{
  public:
    
    //----------------------------------------------------------------
    // Default constructor -- the display window and the data window
    // are both set to Box2i (V2i (0, 0), V2i (width-1, height-1).
    //----------------------------------------------------------------

    Header (int width = 64,
          int height = 64,
          float pixelAspectRatio = 1,
          const Imath::V2f &screenWindowCenter = Imath::V2f (0, 0),
          float screenWindowWidth = 1,
          LineOrder lineOrder = INCREASING_Y,
          Compression = ZIP_COMPRESSION);


    //--------------------------------------------------------------------
    // Constructor -- the data window is specified explicitly; the display
    // window is set to Box2i (V2i (0, 0), V2i (width-1, height-1).
    //--------------------------------------------------------------------

    Header (int width,
          int height,
          const Imath::Box2i &dataWindow,
          float pixelAspectRatio = 1,
          const Imath::V2f &screenWindowCenter = Imath::V2f (0, 0),
          float screenWindowWidth = 1,
          LineOrder lineOrder = INCREASING_Y,
          Compression = ZIP_COMPRESSION);


    //----------------------------------------------------------
    // Constructor -- the display window and the data window are
    // both specified explicitly.
    //----------------------------------------------------------

    Header (const Imath::Box2i &displayWindow,
          const Imath::Box2i &dataWindow,
          float pixelAspectRatio = 1,
          const Imath::V2f &screenWindowCenter = Imath::V2f (0, 0),
          float screenWindowWidth = 1,
          LineOrder lineOrder = INCREASING_Y,
          Compression = ZIP_COMPRESSION);


    //-----------------
    // Copy constructor
    //-----------------

    Header (const Header &other);


    //-----------
    // Destructor
    //-----------

    ~Header ();


    //-----------
    // Assignment
    //-----------

    Header &                  operator = (const Header &other);


    //---------------------------------------------------------------
    // Add an attribute:
    //
    // insert(n,attr)   If no attribute with name n exists, a new
    //                  attribute with name n, and the same type as
    //                  attr, is added, and the value of attr is
    //                  copied into the new attribute.
    //
    //                  If an attribute with name n exists, and its
    //                  type is the same as attr, the value of attr
    //                  is copied into this attribute.
    //
    //                  If an attribute with name n exists, and its
    //                  type is different from attr, an Iex::TypeExc
    //                  is thrown.
    //
    //---------------------------------------------------------------

    void                insert (const char name[],
                                const Attribute &attribute);

    //------------------------------------------------------------------
    // Access to existing attributes:
    //
    // [n]              Returns a reference to the attribute
    //                        with name n.  If no attribute with
    //                        name n exists, an Iex::ArgExc is thrown.
    //
    // typedAttribute<T>(n)   Returns a reference to the attribute
    //                        with name n and type T.  If no attribute
    //                        with name n exists, an Iex::ArgExc is
    //                        thrown.  If an attribute with name n
    //                        exists, but its type is not T, an
    //                        Iex::TypeExc is thrown.
    //
    // findTypedAttribute<T>(n)     Returns a pointer to the attribute with
    //                        name n and type T, or 0 if no attribute
    //                        with name n and type T exists.
    //
    //------------------------------------------------------------------

    Attribute &               operator [] (const char name[]);
    const Attribute &         operator [] (const char name[]) const;

    template <class T> T&     typedAttribute (const char name[]);
    template <class T> const T&     typedAttribute (const char name[]) const;

    template <class T> T*     findTypedAttribute (const char name[]);
    template <class T> const T*     findTypedAttribute (const char name[]) const;


    //---------------------------------------------
    // Iterator-style access to existing attributes
    //---------------------------------------------

    typedef std::map <Name, Attribute *> AttributeMap;

    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;


    //--------------------------------
    // Access to predefined attributes
    //--------------------------------

    Imath::Box2i &            displayWindow ();
    const Imath::Box2i &      displayWindow () const;

    Imath::Box2i &            dataWindow ();
    const Imath::Box2i &      dataWindow () const;

    float &             pixelAspectRatio ();
    const float &       pixelAspectRatio () const;

    Imath::V2f &        screenWindowCenter ();
    const Imath::V2f &        screenWindowCenter () const;

    float &             screenWindowWidth ();
    const float &       screenWindowWidth () const;

    ChannelList &       channels ();
    const ChannelList &       channels () const;

    LineOrder &               lineOrder ();
    const LineOrder &         lineOrder () const;

    Compression &       compression ();
    const Compression &       compression () const;


    //----------------------------------------------------------------------
    // Tile Description:
    //
    // The tile description is a TileDescriptionAttribute whose name
    // is "tiles".  The "tiles" attribute must be present in any tiled
    // image file. When present, it describes various properties of the
    // tiles that make up the file.
    //
    // Convenience functions:
    //
    // setTileDescription(td)
    //     calls insert ("tiles", TileDescriptionAttribute (td))
    //
    // tileDescription()
    //     returns typedAttribute<TileDescriptionAttribute>("tiles").value()
    //
    // hasTileDescription()
    //     return findTypedAttribute<TileDescriptionAttribute>("tiles") != 0
    //
    //----------------------------------------------------------------------

    void                setTileDescription (const TileDescription & td);

    TileDescription &         tileDescription ();
    const TileDescription &   tileDescription () const;

    bool                hasTileDescription() const;


    //----------------------------------------------------------------------
    // Preview image:
    //
    // The preview image is a PreviewImageAttribute whose name is "preview".
    // This attribute is special -- while an image file is being written,
    // the pixels of the preview image can be changed repeatedly by calling
    // OutputFile::updatePreviewImage().
    //
    // Convenience functions:
    //
    // setPreviewImage(p)
    //     calls insert ("preview", PreviewImageAttribute (p))
    //
    // previewImage()
    //     returns typedAttribute<PreviewImageAttribute>("preview").value()
    //
    // hasPreviewImage()
    //     return findTypedAttribute<PreviewImageAttribute>("preview") != 0
    //
    //----------------------------------------------------------------------

    void                setPreviewImage (const PreviewImage &p);

    PreviewImage &            previewImage ();
    const PreviewImage &      previewImage () const;

    bool                hasPreviewImage () const;


    //-------------------------------------------------------------
    // Sanity check -- examines the header, and throws an exception
    // if it finds something wrong (empty display window, negative
    // pixel aspect ratio, unknown compression sceme etc.)
    //
    // set isTiled to true if you are checking a tiled/multi-res
    // header
    //-------------------------------------------------------------

    void                sanityCheck (bool isTiled = false) const;


    //----------------------------------------------------------------
    // Maximum image size and maximim tile size:
    //
    // sanityCheck() will throw an exception if the width or height of
    // the data window exceeds the maximum image width or height, or
    // if the size of a tile exceeds the maximum tile width or height.
    // 
    // At program startup the maximum image and tile width and height
    // are set to zero, meaning that width and height are unlimited.
    //
    // Limiting image and tile width and height limits how much memory
    // will be allocated when a file is opened.  This can help protect
    // applications from running out of memory while trying to read
    // a damaged image file.
    //----------------------------------------------------------------

    static void               setMaxImageSize (int maxWidth, int maxHeight);
    static void               setMaxTileSize (int maxWidth, int maxHeight);


    //------------------------------------------------------------------
    // Input and output:
    //
    // If the header contains a preview image attribute, then writeTo()
    // returns the position of that attribute in the output stream; this
    // information is used by OutputFile::updatePreviewImage().
    // If the header contains no preview image attribute, then writeTo()
    // returns 0.
    //------------------------------------------------------------------


    Int64               writeTo (OStream &os,
                               bool isTiled = false) const;

    void                readFrom (IStream &is, int &version);

  private:

    AttributeMap        _map;
};


//----------
// Iterators
//----------

class Header::Iterator
{
  public:

    Iterator ();
    Iterator (const Header::AttributeMap::iterator &i);

    Iterator &                operator ++ ();
    Iterator                  operator ++ (int);

    const char *        name () const;
    Attribute &               attribute () const;

  private:

    friend class Header::ConstIterator;

    Header::AttributeMap::iterator _i;
};


class Header::ConstIterator
{
  public:

    ConstIterator ();
    ConstIterator (const Header::AttributeMap::const_iterator &i);
    ConstIterator (const Header::Iterator &other);

    ConstIterator &           operator ++ ();
    ConstIterator             operator ++ (int);

    const char *        name () const;
    const Attribute &         attribute () const;

  private:

    friend bool operator == (const ConstIterator &, const ConstIterator &);
    friend bool operator != (const ConstIterator &, const ConstIterator &);

    Header::AttributeMap::const_iterator _i;
};


//------------------------------------------------------------------------
// Library initialization:
//
// In a multithreaded program, staticInitialize() must be called once
// during startup, before the program accesses any other functions or
// classes in the IlmImf library.  Calling staticInitialize() in this
// way avoids races during initialization of the library's global
// variables.
//
// Single-threaded programs are not required to call staticInitialize();
// initialization of the library's global variables happens automatically.
//
//------------------------------------------------------------------------

void staticInitialize ();


//-----------------
// Inline Functions
//-----------------


inline
Header::Iterator::Iterator (): _i()
{
    // empty
}


inline
Header::Iterator::Iterator (const Header::AttributeMap::iterator &i): _i (i)
{
    // empty
}


inline Header::Iterator &           
Header::Iterator::operator ++ ()
{
    ++_i;
    return *this;
}


inline Header::Iterator       
Header::Iterator::operator ++ (int)
{
    Iterator tmp = *this;
    ++_i;
    return tmp;
}


inline const char *
Header::Iterator::name () const
{
    return *_i->first;
}


inline Attribute &      
Header::Iterator::attribute () const
{
    return *_i->second;
}


inline
Header::ConstIterator::ConstIterator (): _i()
{
    // empty
}

inline
Header::ConstIterator::ConstIterator
    (const Header::AttributeMap::const_iterator &i): _i (i)
{
    // empty
}


inline
Header::ConstIterator::ConstIterator (const Header::Iterator &other):
    _i (other._i)
{
    // empty
}

inline Header::ConstIterator &
Header::ConstIterator::operator ++ ()
{
    ++_i;
    return *this;
}


inline Header::ConstIterator        
Header::ConstIterator::operator ++ (int)
{
    ConstIterator tmp = *this;
    ++_i;
    return tmp;
}


inline const char *
Header::ConstIterator::name () const
{
    return *_i->first;
}


inline const Attribute &      
Header::ConstIterator::attribute () const
{
    return *_i->second;
}


inline bool
operator == (const Header::ConstIterator &x, const Header::ConstIterator &y)
{
    return x._i == y._i;
}


inline bool
operator != (const Header::ConstIterator &x, const Header::ConstIterator &y)
{
    return !(x == y);
}


//---------------------
// Template definitions
//---------------------

template <class T>
T &
Header::typedAttribute (const char name[])
{
    Attribute *attr = &(*this)[name];
    T *tattr = dynamic_cast <T*> (attr);

    if (tattr == 0)
      throw Iex::TypeExc ("Unexpected attribute type.");

    return *tattr;
}


template <class T>
const T &
Header::typedAttribute (const char name[]) const
{
    const Attribute *attr = &(*this)[name];
    const T *tattr = dynamic_cast <const T*> (attr);

    if (tattr == 0)
      throw Iex::TypeExc ("Unexpected attribute type.");

    return *tattr;
}


template <class T>
T *
Header::findTypedAttribute (const char name[])
{
    AttributeMap::iterator i = _map.find (name);
    return (i == _map.end())? 0: dynamic_cast <T*> (i->second);
}


template <class T>
const T *
Header::findTypedAttribute (const char name[]) const
{
    AttributeMap::const_iterator i = _map.find (name);
    return (i == _map.end())? 0: dynamic_cast <const T*> (i->second);
}


} // namespace Imf

#endif

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