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✏️ Editing: ImfInputFile.h

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
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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

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