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

//

// Copyright (c) 2002, 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

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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

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

#ifndef INCLUDED_IMF_FRAME_BUFFER_H

#define INCLUDED_IMF_FRAME_BUFFER_H

//-----------------------------------------------------------------------------

//

//      class Slice

//      class FrameBuffer

//

//-----------------------------------------------------------------------------

#include "ImfName.h"

#include "ImfPixelType.h"

#include "ImfExport.h"

#include "ImfNamespace.h"

#include <map>

#include <string>

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER

//-------------------------------------------------------

// Description of a single slice of the frame buffer:

//

// Note -- terminology: as part of a file, a component of

// an image (e.g. red, green, blue, depth etc.) is called

// a "channel".  As part of a frame buffer, an image

// component is called a "slice".

//-------------------------------------------------------

struct IMF_EXPORT Slice

{

    //------------------------------

    // Data type; see ImfPixelType.h

    //------------------------------

    PixelType           type;

    //---------------------------------------------------------------------

    // Memory layout:  The address of pixel (x, y) is

    //

    //  base + (xp / xSampling) * xStride + (yp / ySampling) * yStride

    //

    // where xp and yp are computed as follows:

    //

    //  * If we are reading or writing a scanline-based file:

    //

    //      xp = x

    //      yp = y

    //

    //  * If we are reading a tile whose upper left coorner is at (xt, yt):

    //

    //      if xTileCoords is true then xp = x - xt, else xp = x

    //      if yTileCoords is true then yp = y - yt, else yp = y

    //

    //---------------------------------------------------------------------

    char *              base;

    size_t              xStride;

    size_t              yStride;

    //--------------------------------------------

    // Subsampling: pixel (x, y) is present in the

    // slice only if 

    //

    //  x % xSampling == 0 && y % ySampling == 0

    //

    //--------------------------------------------

    int                 xSampling;

    int                 ySampling;

    //----------------------------------------------------------

    // Default value, used to fill the slice when a file without

    // a channel that corresponds to this slice is read.

    //----------------------------------------------------------

    double              fillValue;

    //-------------------------------------------------------

    // For tiled files, the xTileCoords and yTileCoords flags

    // determine whether pixel addressing is performed using

    // absolute coordinates or coordinates relative to a

    // tile's upper left corner.  (See the comment on base,

    // xStride and yStride, above.)

    //

    // For scanline-based files these flags have no effect;

    // pixel addressing is always done using absolute

    // coordinates.

    //-------------------------------------------------------

    bool                xTileCoords;

    bool                yTileCoords;

    //------------

    // Constructor

    //------------

    Slice (PixelType type = HALF,

           char * base = 0,

           size_t xStride = 0,

           size_t yStride = 0,

           int xSampling = 1,

           int ySampling = 1,

           double fillValue = 0.0,

           bool xTileCoords = false,

           bool yTileCoords = false);

};

class IMF_EXPORT FrameBuffer

{

  public:

    //------------

    // Add a slice

    //------------

    void                        insert (const char name[],

                                        const Slice &slice);

    void                        insert (const std::string &name,

                                        const Slice &slice);

    //----------------------------------------------------------------

    // Access to existing slices:

    //

    // [n]              Returns a reference to the slice with name n.

    //                  If no slice with name n exists, an IEX_NAMESPACE::ArgExc

    //                  is thrown.

    //

    // findSlice(n)     Returns a pointer to the slice with name n,

    //                  or 0 if no slice with name n exists.

    //

    //----------------------------------------------------------------

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

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

    Slice &                     operator [] (const std::string &name);

    const Slice &               operator [] (const std::string &name) const;

    Slice *                     findSlice (const char name[]);

    const Slice *               findSlice (const char name[]) const;

    Slice *                     findSlice (const std::string &name);

    const Slice *               findSlice (const std::string &name) const;

    //-----------------------------------------

    // Iterator-style access to existing slices

    //-----------------------------------------

    typedef std::map <Name, Slice> SliceMap;

    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;

  private:

    SliceMap                    _map;

};

//----------

// Iterators

//----------

class FrameBuffer::Iterator

{

  public:

    Iterator ();

    Iterator (const FrameBuffer::SliceMap::iterator &i);

    Iterator &                  operator ++ ();

    Iterator                    operator ++ (int);

    const char *                name () const;

    Slice &                     slice () const;

  private:

    friend class FrameBuffer::ConstIterator;

    FrameBuffer::SliceMap::iterator _i;

};

class FrameBuffer::ConstIterator

{

  public:

    ConstIterator ();

    ConstIterator (const FrameBuffer::SliceMap::const_iterator &i);

    ConstIterator (const FrameBuffer::Iterator &other);

    ConstIterator &             operator ++ ();

    ConstIterator               operator ++ (int);

    const char *                name () const;

    const Slice &               slice () const;

  private:

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

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

    FrameBuffer::SliceMap::const_iterator _i;

};

//-----------------

// Inline Functions

//-----------------

inline

FrameBuffer::Iterator::Iterator (): _i()

{

    // empty

}

inline

FrameBuffer::Iterator::Iterator (const FrameBuffer::SliceMap::iterator &i):

    _i (i)

{

    // empty

}

inline FrameBuffer::Iterator &

FrameBuffer::Iterator::operator ++ ()

{

    ++_i;

    return *this;

}

inline FrameBuffer::Iterator

FrameBuffer::Iterator::operator ++ (int)

{

    Iterator tmp = *this;

    ++_i;

    return tmp;

}

inline const char *

FrameBuffer::Iterator::name () const

{

    return *_i->first;

}

inline Slice &

FrameBuffer::Iterator::slice () const

{

    return _i->second;

}

inline

FrameBuffer::ConstIterator::ConstIterator (): _i()

{

    // empty

}

inline

FrameBuffer::ConstIterator::ConstIterator

    (const FrameBuffer::SliceMap::const_iterator &i): _i (i)

{

    // empty

}

inline

FrameBuffer::ConstIterator::ConstIterator (const FrameBuffer::Iterator &other):

    _i (other._i)

{

    // empty

}

inline FrameBuffer::ConstIterator &

FrameBuffer::ConstIterator::operator ++ ()

{

    ++_i;

    return *this;

}

inline FrameBuffer::ConstIterator

FrameBuffer::ConstIterator::operator ++ (int)

{

    ConstIterator tmp = *this;

    ++_i;

    return tmp;

}

inline const char *

FrameBuffer::ConstIterator::name () const

{

    return *_i->first;

}

inline const Slice &

FrameBuffer::ConstIterator::slice () const

{

    return _i->second;

}

inline bool

operator == (const FrameBuffer::ConstIterator &x,

             const FrameBuffer::ConstIterator &y)

{

    return x._i == y._i;

}

inline bool

operator != (const FrameBuffer::ConstIterator &x,

             const FrameBuffer::ConstIterator &y)

{

    return !(x == y);

}

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT

#endif