///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, 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.
// * Neither the name of Industrial Light & Magic nor the names of
// 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
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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///////////////////////////////////////////////////////////////////////////
#ifndef INCLUDED_IMF_OUTPUT_FILE_H
#define INCLUDED_IMF_OUTPUT_FILE_H
//-----------------------------------------------------------------------------
//
// class OutputFile
//
//-----------------------------------------------------------------------------
#include <ImfHeader.h>
#include <ImfFrameBuffer.h>
#include <ImfThreading.h>
namespace Imf {
class InputFile;
struct PreviewRgba;
class OutputFile
{
public:
//-----------------------------------------------------------
// Constructor -- opens the file and writes the file header.
// The file header is also copied into the OutputFile object,
// and can later be accessed via the header() method.
// Destroying this OutputFile object automatically closes
// the file.
//
// numThreads determines the number of threads that will be
// used to write the file (see ImfThreading.h).
//-----------------------------------------------------------
OutputFile (const char fileName[], const Header &header,
int numThreads = globalThreadCount());
//------------------------------------------------------------
// Constructor -- attaches the new OutputFile object to a file
// that has already been opened, and writes the file header.
// The file header is also copied into the OutputFile object,
// and can later be accessed via the header() method.
// Destroying this OutputFile object does not automatically
// close the file.
//
// numThreads determines the number of threads that will be
// used to write the file (see ImfThreading.h).
//------------------------------------------------------------
OutputFile (OStream &os, const Header &header,
int numThreads = globalThreadCount());
//-------------------------------------------------
// Destructor
//
// Destroying the OutputFile object before writing
// all scan lines within the data window results in
// an incomplete file.
//-------------------------------------------------
virtual ~OutputFile ();
//------------------------
// 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 FrameBuffer &frameBuffer);
//-----------------------------------
// Access to the current frame buffer
//-----------------------------------
const FrameBuffer & 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 (InputFile &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::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[]);
//---------------------------------------------------------
// Break a scan line -- for testing and debugging only:
//
// breakScanLine(y,p,n,c) introduces an error into the
// output file by writing n copies of character c, starting
// p bytes from the beginning of the pixel data block that
// contains scan line y.
//
// Warning: Calling this function usually results in a
// broken image file. The file or parts of it may not
// be readable, or the file may contain bad data.
//
//---------------------------------------------------------
void breakScanLine (int y, int offset, int length, char c);
struct Data;
private:
OutputFile (const OutputFile &); // not implemented
OutputFile & operator = (const OutputFile &); // not implemented
void initialize (const Header &header);
Data * _data;
};
} // namespace Imf
#endif