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//

// Copyright (c) 2011, Industrial Light & Magic, a division of Lucas

// Digital Ltd. LLC

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#ifndef INCLUDED_IMF_DEEP_SCAN_LINE_OUTPUT_FILE_H

#define INCLUDED_IMF_DEEP_SCAN_LINE_OUTPUT_FILE_H

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

//

//      class DeepScanLineOutputFile

//

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

#include "ImfHeader.h"

#include "ImfFrameBuffer.h"

#include "ImfThreading.h"

#include "ImfGenericOutputFile.h"

#include "ImfNamespace.h"

#include "ImfForward.h"

#include "ImfExport.h"

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER

struct PreviewRgba;

class IMF_EXPORT DeepScanLineOutputFile : public GenericOutputFile

{

  public:

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

    // Constructor -- opens the file and writes the file header.

    // The file header is also copied into the DeepScanLineOutputFile

    // object, and can later be accessed via the header() method.

    // Destroying this DeepScanLineOutputFile object automatically closes

    // the file.

    //

    // numThreads determines the number of threads that will be

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

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

    DeepScanLineOutputFile (const char fileName[], const Header &header,

                int numThreads = globalThreadCount());

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

    // Constructor -- attaches the new DeepScanLineOutputFile object

    // to a file that has already been opened, and writes the file header.

    // The file header is also copied into the DeepScanLineOutputFile

    // object, and can later be accessed via the header() method.

    // Destroying this DeepScanLineOutputFile object does not automatically

    // close the file.

    //

    // numThreads determines the number of threads that will be

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

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

    DeepScanLineOutputFile (OPENEXR_IMF_INTERNAL_NAMESPACE::OStream &os, const Header &header,

                int numThreads = globalThreadCount());

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

    // Destructor

    //

    // Destroying the DeepScanLineOutputFile object

    // before writing all scan lines within the data

    // window results in an incomplete file.

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

    virtual ~DeepScanLineOutputFile ();

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

    // Access to the file name

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

    const char *        fileName () const;

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

    // Access to the file header

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

    const Header &      header () const;

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

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

    // object into the OutputFile object.

    //

    // The current frame buffer is the source of the pixel

    // data written to the file.  The current frame buffer

    // must be set at least once before writePixels() is

    // called.  The current frame buffer can be changed

    // after each call to writePixels.

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

    void                setFrameBuffer (const DeepFrameBuffer &frameBuffer);

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

    // Access to the current frame buffer

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

    const DeepFrameBuffer & frameBuffer () const;

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

    // Write pixel data:

    //

    // writePixels(n) retrieves the next n scan lines worth of data from

    // the current frame buffer, starting with the scan line indicated by

    // currentScanLine(), and stores the data in the output file, and

    // progressing in the direction indicated by header.lineOrder().

    //

    // To produce a complete and correct file, exactly m scan lines must

    // be written, where m is equal to

    // header().dataWindow().max.y - header().dataWindow().min.y + 1.

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

    void                writePixels (int numScanLines = 1);

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

    // Access to the current scan line:

    //

    // currentScanLine() returns the y coordinate of the first scan line

    // that will be read from the current frame buffer during the next

    // call to writePixels().

    //

    // If header.lineOrder() == INCREASING_Y:

    //

    //  The current scan line before the first call to writePixels()

    //  is header().dataWindow().min.y.  After writing each scan line,

    //  the current scan line is incremented by 1.

    //

    // If header.lineOrder() == DECREASING_Y:

    //

    //  The current scan line before the first call to writePixels()

    //  is header().dataWindow().max.y.  After writing each scan line,

    //  the current scan line is decremented by 1.

    //

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

    int                 currentScanLine () const;

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

    // Shortcut to copy all pixels from an InputFile into this file,

    // without uncompressing and then recompressing the pixel data.

    // This file's header must be compatible with the InputFile's

    // header:  The two header's "dataWindow", "compression",

    // "lineOrder" and "channels" attributes must be the same.

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

    void                copyPixels (DeepScanLineInputFile &in);

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

    // Shortcut to copy pixels from a given part of a multipart file

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

    void                copyPixels (DeepScanLineInputPart &in);

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

    // Updating the preview image:

    //

    // updatePreviewImage() supplies a new set of pixels for the

    // preview image attribute in the file's header.  If the header

    // does not contain a preview image, updatePreviewImage() throws

    // an IEX_NAMESPACE::LogicExc.

    //

    // Note: updatePreviewImage() is necessary because images are

    // often stored in a file incrementally, a few scan lines at a

    // time, while the image is being generated.  Since the preview

    // image is an attribute in the file's header, it gets stored in

    // the file as soon as the file is opened, but we may not know

    // what the preview image should look like until we have written

    // the last scan line of the main image.

    //

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

    void                updatePreviewImage (const PreviewRgba newPixels[]);

    struct Data;

  private:

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

    // Constructor -- attaches the OutputStreamMutex to the

    // given one from MultiPartOutputFile. Set the previewPosition

    // and lineOffsetsPosition which have been acquired from

    // the constructor of MultiPartOutputFile as well.

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

    DeepScanLineOutputFile (const OutputPartData* part);

    DeepScanLineOutputFile (const DeepScanLineOutputFile &);                    // not implemented

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

    void                initialize (const Header &header);

    void                initializeLineBuffer();

    Data *              _data;

    friend class MultiPartOutputFile;

};

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT

#endif