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///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2011, 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
// 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
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///////////////////////////////////////////////////////////////////////////
#ifndef IMFDEEPSCANLINEOUTPUTPART_H_
#define IMFDEEPSCANLINEOUTPUTPART_H_
#include "ImfDeepScanLineOutputFile.h"
#include "ImfMultiPartOutputFile.h"
#include "ImfNamespace.h"
#include "ImfExport.h"
OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER
class IMF_EXPORT DeepScanLineOutputPart
{
public:
DeepScanLineOutputPart(MultiPartOutputFile& multiPartFile, int partNumber);
//------------------------
// 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);
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[]);
private:
DeepScanLineOutputFile* file;
};
OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT
#endif /* IMFDEEPSCANLINEOUTPUTPART_H_ */
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