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✏️ Editing: ImfDeepScanLineOutputFile.h

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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

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