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ImfInputFile.h

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// All rights reserved.
// 
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// 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.
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// 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
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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 <string>
#include <fstream>
#include <ImfThreading.h>

namespace Imf {

class TiledInputFile;
class ScanLineInputFile;


class InputFile
{
  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 (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;


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

    void          initialize ();
    TiledInputFile *    tFile ();
    
    friend void TiledOutputFile::copyPixels (InputFile &);
    
    Data *        _data;
};


} // namespace Imf

#endif

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