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

//

// 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

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// in the documentation and/or other materials provided with the

// distribution.

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// its contributors may be used to endorse or promote products derived

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

#ifndef INCLUDED_IMF_INPUT_FILE_H

#define INCLUDED_IMF_INPUT_FILE_H

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

//

//	class InputFile -- a scanline-based interface that can be used

//	to read both scanline-based and tiled OpenEXR image files.

//

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

#include "ImfHeader.h"

#include "ImfFrameBuffer.h"

#include "ImfTiledOutputFile.h"

#include "ImfThreading.h"

#include "ImfGenericInputFile.h"

#include "ImfNamespace.h"

#include "ImfForward.h"

#include "ImfExport.h"

#include <fstream>

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER

class IMF_EXPORT InputFile : public GenericInputFile

{

  public:

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

    // A constructor that opens the file with the specified name.

    // Destroying the InputFile object will close the file.

    //

    // numThreads determines the number of threads that will be

    // used to read the file (see ImfThreading.h).

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

    InputFile (const char fileName[], int numThreads = globalThreadCount());

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

    // A constructor that attaches the new InputFile object to a

    // file that has already been opened.  Destroying the InputFile

    // object will not close the file.

    //

    // numThreads determines the number of threads that will be

    // used to read the file (see ImfThreading.h).

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

    InputFile (OPENEXR_IMF_INTERNAL_NAMESPACE::IStream &is, int numThreads = globalThreadCount());

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

    // Destructor

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

    virtual ~InputFile ();

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

    // Access to the file name

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

    const char *	fileName () const;

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

    // Access to the file header

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

    const Header &	header () const;

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

    // Access to the file format version

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

    int			version () const;

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

    // Set the current frame buffer -- copies the FrameBuffer

    // object into the InputFile object.

    //

    // The current frame buffer is the destination for the pixel

    // data read from the file.  The current frame buffer must be

    // set at least once before readPixels() is called.

    // The current frame buffer can be changed after each call

    // to readPixels().

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

    void		setFrameBuffer (const FrameBuffer &frameBuffer);

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

    // Access to the current frame buffer

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

    const FrameBuffer &	frameBuffer () const;

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

    // Check if the file is complete:

    //

    // isComplete() returns true if all pixels in the data window are

    // present in the input file, or false if any pixels are missing.

    // (Another program may still be busy writing the file, or file

    // writing may have been aborted prematurely.)

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

    bool		isComplete () const;

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

    // Check if SSE optimization is enabled

    //

    // Call after setFrameBuffer() to query whether optimized file decoding

    // is available - decode times will be faster if returns true

    //

    // Optimization depends on:

    //   the file type (only scanline data is supported),

    //   the framebuffer channels (RGB/RGBA mono or stereo)

    //   the framebuffer channel types (all channels half-float format only)

    //   the file channels (RGB/RGBA mono or stereo)

    //   the file channel types (all channel half-float format only)

    //   whether SSE2 instruction support was detected at compile time

    //

    // Calling isOptimizationEnabled before setFrameBuffer will throw an exception

    //

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

    bool                isOptimizationEnabled () const;

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

    // Read pixel data:

    //

    // readPixels(s1,s2) reads all scan lines with y coordinates

    // in the interval [min (s1, s2), max (s1, s2)] from the file,

    // and stores them in the current frame buffer.

    //

    // Both s1 and s2 must be within the interval

    // [header().dataWindow().min.y, header().dataWindow().max.y]

    //

    // The scan lines can be read from the file in random order, and

    // individual scan lines may be skipped or read multiple times.

    // For maximum efficiency, the scan lines should be read in the

    // order in which they were written to the file.

    //

    // readPixels(s) calls readPixels(s,s).

    //

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

    void		readPixels (int scanLine1, int scanLine2);

    void		readPixels (int scanLine);

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

    // Read a block of raw pixel data from the file,

    // without uncompressing it (this function is

    // used to implement OutputFile::copyPixels()).

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

    void		rawPixelData (int firstScanLine,

				      const char *&pixelData,

				      int &pixelDataSize);

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

    // Read a tile of raw pixel data from the file,

    // without uncompressing it (this function is

    // used to implement TiledOutputFile::copyPixels()).

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

    void		rawTileData (int &dx, int &dy,

				     int &lx, int &ly,

				     const char *&pixelData,

				     int &pixelDataSize);

    struct Data;

  private:

    InputFile (InputPartData* part);

    InputFile (const InputFile &);			// not implemented

    InputFile & operator = (const InputFile &);		// not implemented

    void		initialize ();

    void                multiPartInitialize(InputPartData* part);

    void                compatibilityInitialize(OPENEXR_IMF_INTERNAL_NAMESPACE::IStream& is);

    TiledInputFile *	tFile ();

    friend void TiledOutputFile::copyPixels (InputFile &);

    Data *		_data;

    friend class MultiPartInputFile;

};

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT

#endif