///////////////////////////////////////////////////////////////////////////
//
// 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.
// *       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
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
///////////////////////////////////////////////////////////////////////////

//-----------------------------------------------------------------------------
//
//      class DeepTiledOutputFile
//
//-----------------------------------------------------------------------------

#include "ImfDeepTiledOutputFile.h"
#include "ImfDeepTiledInputFile.h"
#include "ImfDeepTiledInputPart.h"
#include "ImfInputFile.h"
#include "ImfTileDescriptionAttribute.h"
#include "ImfPreviewImageAttribute.h"
#include "ImfChannelList.h"
#include "ImfMisc.h"
#include "ImfTiledMisc.h"
#include "ImfStdIO.h"
#include "ImfCompressor.h"
#include "ImfOutputStreamMutex.h"
#include "ImfOutputPartData.h"
#include "ImfArray.h"
#include "ImfXdr.h"
#include "ImfVersion.h"
#include "ImfTileOffsets.h"
#include "ImfThreading.h"
#include "ImfPartType.h"

#include "ImathBox.h"

#include "IlmThreadPool.h"
#include "IlmThreadSemaphore.h"
#include "IlmThreadMutex.h"

#include "Iex.h"

#include <string>
#include <vector>
#include <fstream>
#include <assert.h>
#include <map>
#include <algorithm>

#include "ImfNamespace.h"

OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER

using IMATH_NAMESPACE::Box2i;
using IMATH_NAMESPACE::V2i;
using std::string;
using std::vector;
using std::ofstream;
using std::map;
using std::min;
using std::max;
using std::swap;
using ILMTHREAD_NAMESPACE::Mutex;
using ILMTHREAD_NAMESPACE::Lock;
using ILMTHREAD_NAMESPACE::Semaphore;
using ILMTHREAD_NAMESPACE::Task;
using ILMTHREAD_NAMESPACE::TaskGroup;
using ILMTHREAD_NAMESPACE::ThreadPool;

namespace {

struct TOutSliceInfo
{
    PixelType                   type;
    const char *                base;
    size_t                      sampleStride;
    size_t                      xStride;
    size_t                      yStride;
    bool                        zero;
    int                         xTileCoords;
    int                         yTileCoords;

    TOutSliceInfo (PixelType type = HALF,
                   size_t sampleStride = 0,
                   size_t xStride = 0,
                   size_t yStride = 0,
                   bool zero = false,
                   int xTileCoords = 0,
                   int yTileCoords = 0);
};


TOutSliceInfo::TOutSliceInfo (PixelType t,
                              size_t spst,
                              size_t xStride,
                              size_t yStride,
                              bool z,
                              int xtc,
                              int ytc)
:
    type (t),
    sampleStride (spst),
    xStride(xStride),
    yStride(yStride),
    zero (z),
    xTileCoords (xtc),
    yTileCoords (ytc)
{
    // empty
}


struct TileCoord
{
    int         dx;
    int         dy;
    int         lx;
    int         ly;


    TileCoord (int xTile = 0, int yTile = 0,
               int xLevel = 0, int yLevel = 0)
    :
        dx (xTile),  dy (yTile),
        lx (xLevel), ly (yLevel)
    {
        // empty
    }


    bool
    operator < (const TileCoord &other) const
    {
        return (ly < other.ly) ||
               (ly == other.ly && lx < other.lx) ||
               ((ly == other.ly && lx == other.lx) &&
                    ((dy < other.dy) || (dy == other.dy && dx < other.dx)));
    }


    bool
    operator == (const TileCoord &other) const
    {
        return lx == other.lx &&
               ly == other.ly &&
               dx == other.dx &&
               dy == other.dy;
    }
};


struct BufferedTile
{
    char *      pixelData;
    Int64         pixelDataSize;
    Int64         unpackedDataSize;
    char *      sampleCountTableData;
    Int64         sampleCountTableSize;

    BufferedTile (const char *data, int size, int unpackedSize,
                  const char *tableData, int tableSize):
        pixelData (0),
        pixelDataSize(size),
        unpackedDataSize(unpackedSize),
        sampleCountTableData(0),
        sampleCountTableSize(tableSize)
    {
        pixelData = new char[pixelDataSize];
        memcpy (pixelData, data, pixelDataSize);

        sampleCountTableData = new char[tableSize];
        memcpy (sampleCountTableData, tableData, tableSize);
    }

    ~BufferedTile()
    {
        delete [] pixelData;
        delete [] sampleCountTableData;
    }
};


typedef map <TileCoord, BufferedTile *> TileMap;


struct TileBuffer
{
    Array<char>         buffer;
    const char *        dataPtr;
    Int64               dataSize;
    Int64               uncompressedSize;
    Compressor *        compressor;
    Array<char>         sampleCountTableBuffer;
    const char *        sampleCountTablePtr;
    Int64               sampleCountTableSize;
    Compressor*         sampleCountTableCompressor;
    TileCoord           tileCoord;
    bool                hasException;
    string              exception;

     TileBuffer ();
    ~TileBuffer ();

    inline void         wait () {_sem.wait();}
    inline void         post () {_sem.post();}

  protected:

    Semaphore           _sem;
};


TileBuffer::TileBuffer ():
    dataPtr (0),
    dataSize (0),
    compressor (0),
    sampleCountTablePtr (0),
    sampleCountTableCompressor (0),
    hasException (false),
    exception (),
    _sem (1)
{
    // empty
}


TileBuffer::~TileBuffer ()
{
    if (compressor != 0)
        delete compressor;

    if (sampleCountTableCompressor != 0)
        delete sampleCountTableCompressor;
}


} // namespace


struct DeepTiledOutputFile::Data
{
    Header              header;                 // the image header
    int                 version;                // file format version
    bool                multipart;              // file is multipart
    TileDescription     tileDesc;               // describes the tile layout
    DeepFrameBuffer     frameBuffer;            // framebuffer to write into
    Int64               previewPosition;
    LineOrder           lineOrder;              // the file's lineorder
    int                 minX;                   // data window's min x coord
    int                 maxX;                   // data window's max x coord
    int                 minY;                   // data window's min y coord
    int                 maxY;                   // data window's max x coord

    int                 numXLevels;             // number of x levels
    int                 numYLevels;             // number of y levels
    int *               numXTiles;              // number of x tiles at a level
    int *               numYTiles;              // number of y tiles at a level

    TileOffsets         tileOffsets;            // stores offsets in file for
                                                // each tile

    Compressor::Format  format;                 // compressor's data format
    vector<TOutSliceInfo*> slices;              // info about channels in file

    vector<TileBuffer*> tileBuffers;

    Int64               tileOffsetsPosition;    // position of the tile index

    TileMap             tileMap;                // the map of buffered tiles
    TileCoord           nextTileToWrite;

    int                 partNumber;             // the output part number

    char*               sampleCountSliceBase;   // the pointer to the number
                                                // of samples in each pixel
    int                 sampleCountXStride;     // the x stride for sampleCountSliceBase
    int                 sampleCountYStride;     // the y stride for sampleCountSliceBase
    int                 sampleCountXTileCoords; // using x coordinates relative to current tile
    int                 sampleCountYTileCoords; // using y coordinates relative to current tile

    Int64                 maxSampleCountTableSize;// the max size in bytes for a pixel
                                                // sample count table
    OutputStreamMutex*  _streamData;
    bool                _deleteStream;
                                                
     Data (int numThreads);
    ~Data ();

    inline TileBuffer * getTileBuffer (int number);
                                                // hash function from tile
                                                // buffer coords into our
                                                // vector of tile buffers

    int&                getSampleCount(int x, int y);
                                                // get the number of samples
                                                // in each pixel

    TileCoord           nextTileCoord (const TileCoord &a);
};


DeepTiledOutputFile::Data::Data (int numThreads):
    numXTiles(0),
    numYTiles(0),
    tileOffsetsPosition (0),
    partNumber(-1),
    _streamData(NULL),
    _deleteStream(true)
{
    //
    // We need at least one tileBuffer, but if threading is used,
    // to keep n threads busy we need 2*n tileBuffers
    //

    tileBuffers.resize (max (1, 2 * numThreads));
    for (size_t i = 0; i < tileBuffers.size(); i++)
        tileBuffers[i] = 0;
}


DeepTiledOutputFile::Data::~Data ()
{
    delete [] numXTiles;
    delete [] numYTiles;

    //
    // Delete all the tile buffers, if any still happen to exist
    //

    for (TileMap::iterator i = tileMap.begin(); i != tileMap.end(); ++i)
        delete i->second;

    for (size_t i = 0; i < tileBuffers.size(); i++)
        if (tileBuffers[i] != 0)
            delete tileBuffers[i];

    for (size_t i = 0; i < slices.size(); i++)
        delete slices[i];
}


int&
DeepTiledOutputFile::Data::getSampleCount(int x, int y)
{
    return sampleCount(sampleCountSliceBase,
                       sampleCountXStride,
                       sampleCountYStride,
                       x, y);
}


TileBuffer*
DeepTiledOutputFile::Data::getTileBuffer (int number)
{
    return tileBuffers[number % tileBuffers.size()];
}


TileCoord
DeepTiledOutputFile::Data::nextTileCoord (const TileCoord &a)
{
    TileCoord b = a;

    if (lineOrder == INCREASING_Y)
    {
        b.dx++;

        if (b.dx >= numXTiles[b.lx])
        {
            b.dx = 0;
            b.dy++;

            if (b.dy >= numYTiles[b.ly])
            {
                //
                // the next tile is in the next level
                //

                b.dy = 0;

                switch (tileDesc.mode)
                {
                  case ONE_LEVEL:
                  case MIPMAP_LEVELS:

                    b.lx++;
                    b.ly++;
                    break;

                  case RIPMAP_LEVELS:

                    b.lx++;

                    if (b.lx >= numXLevels)
                    {
                        b.lx = 0;
                        b.ly++;

                        #ifdef DEBUG
                            assert (b.ly <= numYLevels);
                        #endif
                    }
                    break;
                  case NUM_LEVELMODES :
                      throw IEX_NAMESPACE::LogicExc("unknown level mode computing nextTileCoord");
                }
            }
        }
    }
    else if (lineOrder == DECREASING_Y)
    {
        b.dx++;

        if (b.dx >= numXTiles[b.lx])
        {
            b.dx = 0;
            b.dy--;

            if (b.dy < 0)
            {
                //
                // the next tile is in the next level
                //

                switch (tileDesc.mode)
                {
                  case ONE_LEVEL:
                  case MIPMAP_LEVELS:

                    b.lx++;
                    b.ly++;
                    break;

                  case RIPMAP_LEVELS:

                    b.lx++;

                    if (b.lx >= numXLevels)
                    {
                        b.lx = 0;
                        b.ly++;

                        #ifdef DEBUG
                            assert (b.ly <= numYLevels);
                        #endif
                    }
                    break;
                  case NUM_LEVELMODES :
                      throw IEX_NAMESPACE::LogicExc("unknown level mode computing nextTileCoord");
                }

                if (b.ly < numYLevels)
                    b.dy = numYTiles[b.ly] - 1;
            }
        }
    }else if(lineOrder==RANDOM_Y)
    {                 
        THROW (IEX_NAMESPACE::ArgExc,
              "can't compute next tile from randomly ordered image: use getTilesInOrder instead");
        
    }

    return b;
}


namespace {

void
writeTileData (DeepTiledOutputFile::Data *ofd,
               int dx, int dy,
               int lx, int ly,
               const char pixelData[],
               Int64 pixelDataSize,
               Int64 unpackedDataSize,
               const char sampleCountTableData[],
               Int64 sampleCountTableSize)
{
    
    //
    // Store a block of pixel data in the output file, and try
    // to keep track of the current writing position the file,
    // without calling tellp() (tellp() can be fairly expensive).
    //

    Int64 currentPosition = ofd->_streamData->currentPosition;
    ofd->_streamData->currentPosition = 0;

    if (currentPosition == 0)
        currentPosition = ofd->_streamData->os->tellp();

    ofd->tileOffsets (dx, dy, lx, ly) = currentPosition;

    #ifdef DEBUG
        assert (ofd->_streamData->os->tellp() == currentPosition);
    #endif

    //
    // Write the tile header.
    //

    if (ofd->multipart)
    {
        Xdr::write <StreamIO> (*ofd->_streamData->os, ofd->partNumber);
    }
    Xdr::write <StreamIO> (*ofd->_streamData->os, dx);
    Xdr::write <StreamIO> (*ofd->_streamData->os, dy);
    Xdr::write <StreamIO> (*ofd->_streamData->os, lx);
    Xdr::write <StreamIO> (*ofd->_streamData->os, ly);

    //
    // Write the packed size of the pixel sample count table (64 bits)
    //

    Xdr::write <StreamIO> (*ofd->_streamData->os, sampleCountTableSize);

    //
    // Write the packed and unpacked data size (64 bits each)
    //

    Xdr::write <StreamIO> (*ofd->_streamData->os, pixelDataSize);
    Xdr::write <StreamIO> (*ofd->_streamData->os, unpackedDataSize);

    //
    // Write the compressed pixel sample count table.
    //

    ofd->_streamData->os->write (sampleCountTableData, sampleCountTableSize);

    //
    // Write the compressed data.
    //

    ofd->_streamData->os->write (pixelData, pixelDataSize);

    //
    // Keep current position in the file so that we can avoid
    // redundant seekg() operations (seekg() can be fairly expensive).
    //

    ofd->_streamData->currentPosition = currentPosition        +
                                  4 * Xdr::size<int>()   + // dx, dy, lx, ly,
                                  3 * Xdr::size<Int64>() + // sampleCountTableSize,
                                                           // pixelDataSize,
                                                           // unpackedDataSize
                                  sampleCountTableSize   +
                                  pixelDataSize;

    if (ofd->multipart)
    {
        ofd->_streamData->currentPosition += Xdr::size<int>();
    }
}



void
bufferedTileWrite (
                   DeepTiledOutputFile::Data *ofd,
                   int dx, int dy,
                   int lx, int ly,
                   const char pixelData[],
                   Int64 pixelDataSize,
                   Int64 unpackedDataSize,
                   const char sampleCountTableData[],
                   Int64 sampleCountTableSize)
{
    //
    // Check if a tile with coordinates (dx,dy,lx,ly) has already been written.
    //

    if (ofd->tileOffsets (dx, dy, lx, ly))
    {
        THROW (IEX_NAMESPACE::ArgExc,
               "Attempt to write tile "
               "(" << dx << ", " << dy << ", " << lx << ", " << ly << ") "
               "more than once.");
    }

    //
    // If tiles can be written in random order, then don't buffer anything.
    //

    if (ofd->lineOrder == RANDOM_Y)
    {
        writeTileData (ofd, dx, dy, lx, ly,
                       pixelData, pixelDataSize, unpackedDataSize,
                       sampleCountTableData, sampleCountTableSize);
        return;
    }

    //
    // If the tiles cannot be written in random order, then check if a
    // tile with coordinates (dx,dy,lx,ly) has already been buffered.
    //

    TileCoord currentTile = TileCoord(dx, dy, lx, ly);

    if (ofd->tileMap.find (currentTile) != ofd->tileMap.end())
    {
        THROW (IEX_NAMESPACE::ArgExc,
               "Attempt to write tile "
               "(" << dx << ", " << dy << ", " << lx << ", " << ly << ") "
               "more than once.");
    }

    //
    // If all the tiles before this one have already been written to the file,
    // then write this tile immediately and check if we have buffered tiles
    // that can be written after this tile.
    //
    // Otherwise, buffer the tile so it can be written to file later.
    //

    if (ofd->nextTileToWrite == currentTile)
    {
        writeTileData (ofd, dx, dy, lx, ly,
                       pixelData, pixelDataSize, unpackedDataSize,
                       sampleCountTableData, sampleCountTableSize);
        ofd->nextTileToWrite = ofd->nextTileCoord (ofd->nextTileToWrite);

        TileMap::iterator i = ofd->tileMap.find (ofd->nextTileToWrite);

        //
        // Step through the tiles and write all successive buffered tiles after
        // the current one.
        //

        while(i != ofd->tileMap.end())
        {
            //
            // Write the tile, and then delete the tile's buffered data
            //

            writeTileData (ofd,
                           i->first.dx, i->first.dy,
                           i->first.lx, i->first.ly,
                           i->second->pixelData,
                           i->second->pixelDataSize,
                           i->second->unpackedDataSize,
                           i->second->sampleCountTableData,
                           i->second->sampleCountTableSize);

            delete i->second;
            ofd->tileMap.erase (i);

            //
            // Proceed to the next tile
            //

            ofd->nextTileToWrite = ofd->nextTileCoord (ofd->nextTileToWrite);
            i = ofd->tileMap.find (ofd->nextTileToWrite);
        }
    }
    else
    {
        //
        // Create a new BufferedTile, copy the pixelData into it, and
        // insert it into the tileMap.
        //

        ofd->tileMap[currentTile] =
            new BufferedTile ((const char *)pixelData, pixelDataSize, unpackedDataSize,
                              sampleCountTableData, sampleCountTableSize);
    }
}


void
convertToXdr (DeepTiledOutputFile::Data *ofd,
              Array<char>& tileBuffer,
              int numScanLines,
              vector<Int64>& bytesPerLine)
{
    //
    // Convert the contents of a TiledOutputFile's tileBuffer from the
    // machine's native representation to Xdr format. This function is called
    // by writeTile(), below, if the compressor wanted its input pixel data
    // in the machine's native format, but then failed to compress the data
    // (most compressors will expand rather than compress random input data).
    //
    // Note that this routine assumes that the machine's native representation
    // of the pixel data has the same size as the Xdr representation.  This
    // makes it possible to convert the pixel data in place, without an
    // intermediate temporary buffer.
    //

    //
    // Set these to point to the start of the tile.
    // We will write to toPtr, and read from fromPtr.
    //

    char *writePtr = tileBuffer;
    const char *readPtr = writePtr;

    //
    // Iterate over all scan lines in the tile.
    //

    for (int y = 0; y < numScanLines; ++y)
    {
        //
        // Iterate over all slices in the file.
        //

        for (unsigned int i = 0; i < ofd->slices.size(); ++i)
        {
            const TOutSliceInfo &slice = *ofd->slices[i];

            //
            // Convert the samples in place.
            //

            Int64 numPixelsPerScanLine = bytesPerLine[y];

            convertInPlace (writePtr, readPtr, slice.type,
                            numPixelsPerScanLine);
        }
    }

    #ifdef DEBUG

        assert (writePtr == readPtr);

    #endif
}


//
// A TileBufferTask encapsulates the task of copying a tile from
// the user's framebuffer into a LineBuffer and compressing the data
// if necessary.
//

class TileBufferTask: public Task
{
  public:

    TileBufferTask (TaskGroup *group,
                    DeepTiledOutputFile::Data *ofd,
                    int number,
                    int dx, int dy,
                    int lx, int ly);

    virtual ~TileBufferTask ();

    virtual void                execute ();

  private:

    DeepTiledOutputFile::Data *     _ofd;
    TileBuffer *                _tileBuffer;
};


TileBufferTask::TileBufferTask
    (TaskGroup *group,
     DeepTiledOutputFile::Data *ofd,
     int number,
     int dx, int dy,
     int lx, int ly)
:
    Task (group),
    _ofd (ofd),
    _tileBuffer (_ofd->getTileBuffer (number))
{
    //
    // Wait for the tileBuffer to become available
    //

    _tileBuffer->wait ();
    _tileBuffer->tileCoord = TileCoord (dx, dy, lx, ly);
}


TileBufferTask::~TileBufferTask ()
{
    //
    // Signal that the tile buffer is now free
    //

    _tileBuffer->post ();
}


void
TileBufferTask::execute ()
{
    try
    {
        //
        // First copy the pixel data from the frame buffer
        // into the tile buffer
        //
        // Convert one tile's worth of pixel data to
        // a machine-independent representation, and store
        // the result in _tileBuffer->buffer.
        //

        Box2i tileRange = OPENEXR_IMF_INTERNAL_NAMESPACE::dataWindowForTile (
                _ofd->tileDesc,
                _ofd->minX, _ofd->maxX,
                _ofd->minY, _ofd->maxY,
                _tileBuffer->tileCoord.dx,
                _tileBuffer->tileCoord.dy,
                _tileBuffer->tileCoord.lx,
                _tileBuffer->tileCoord.ly);

        int numScanLines = tileRange.max.y - tileRange.min.y + 1;
//        int numPixelsPerScanLine = tileRange.max.x - tileRange.min.x + 1;

        //
        // Get the bytes for each line.
        //

        vector<Int64> bytesPerLine(_ofd->tileDesc.ySize);
        vector<int> xOffsets(_ofd->slices.size());
        vector<int> yOffsets(_ofd->slices.size());
        for (size_t i = 0; i < _ofd->slices.size(); i++)
        {
            const TOutSliceInfo &slice = *_ofd->slices[i];
            xOffsets[i] = slice.xTileCoords * tileRange.min.x;
            yOffsets[i] = slice.yTileCoords * tileRange.min.y;
        }

        calculateBytesPerLine(_ofd->header,
                              _ofd->sampleCountSliceBase,
                              _ofd->sampleCountXStride,
                              _ofd->sampleCountYStride,
                              tileRange.min.x, tileRange.max.x,
                              tileRange.min.y, tileRange.max.y,
                              xOffsets, yOffsets,
                              bytesPerLine);

        //
        // Allocate the memory for internal buffer.
        // (TODO) more efficient memory management?
        //

        Int64 totalBytes = 0;
        Int64 maxBytesPerTileLine = 0;
        for (size_t i = 0; i < bytesPerLine.size(); i++)
        {
            totalBytes += bytesPerLine[i];
            if (bytesPerLine[i] > maxBytesPerTileLine)
                maxBytesPerTileLine = bytesPerLine[i];
        }
        _tileBuffer->buffer.resizeErase(totalBytes);

        char *writePtr = _tileBuffer->buffer;

        //
        // Iterate over the scan lines in the tile.
        //

        int xOffsetForSampleCount =
                (_ofd->sampleCountXTileCoords == 0) ? 0 : tileRange.min.x;
        int yOffsetForSampleCount =
                (_ofd->sampleCountYTileCoords == 0) ? 0 : tileRange.min.y;

        for (int y = tileRange.min.y; y <= tileRange.max.y; ++y)
        {
            //
            // Iterate over all image channels.
            //

            for (unsigned int i = 0; i < _ofd->slices.size(); ++i)
            {
                const TOutSliceInfo &slice = *_ofd->slices[i];


                //
                // Fill the tile buffer with pixel data.
                //

                if (slice.zero)
                {
                    //
                    // The frame buffer contains no data for this channel.
                    // Store zeroes in _data->tileBuffer.
                    //

                    fillChannelWithZeroes (writePtr, _ofd->format, slice.type,
                                           bytesPerLine[y - tileRange.min.y]);
                }
                else
                {
                    //
                    // The frame buffer contains data for this channel.
                    //

                
                    int xOffsetForData = slice.xTileCoords ? tileRange.min.x : 0;
                    int yOffsetForData = slice.yTileCoords ? tileRange.min.y : 0;

                    // (TOOD) treat sample count offsets differently.
                    copyFromDeepFrameBuffer (writePtr,
                                             slice.base,
                                             _ofd->sampleCountSliceBase,
                                             _ofd->sampleCountXStride,
                                             _ofd->sampleCountYStride,
                                             y,
                                             tileRange.min.x,
                                             tileRange.max.x,
                                             xOffsetForSampleCount,
                                             yOffsetForSampleCount,
                                             xOffsetForData,
                                             yOffsetForData,
                                             slice.sampleStride,
                                             slice.xStride,
                                             slice.yStride,
                                             _ofd->format,
                                             slice.type);
#if defined(DEBUG)
                      assert(writePtr-_tileBuffer->buffer<=totalBytes);
#endif
                }
            }
        }

        //
        // Compress the pixel sample count table.
        //

        char* ptr = _tileBuffer->sampleCountTableBuffer;
        Int64 tableDataSize = 0;
        for (int i = tileRange.min.y; i <= tileRange.max.y; i++)
        {
            int count = 0;
            for (int j = tileRange.min.x; j <= tileRange.max.x; j++)
            {
                count += _ofd->getSampleCount(j - xOffsetForSampleCount,
                                              i - yOffsetForSampleCount);
                Xdr::write <CharPtrIO> (ptr, count);
                tableDataSize += sizeof (int);
            }
        }

       if(_tileBuffer->sampleCountTableCompressor)
       {
           _tileBuffer->sampleCountTableSize =
                _tileBuffer->sampleCountTableCompressor->compress (
                                                    _tileBuffer->sampleCountTableBuffer,
                                                    tableDataSize,
                                                    tileRange.min.y,
                                                    _tileBuffer->sampleCountTablePtr);
       }
       
        //
        // If we can't make data shrink (or compression was disabled), then just use the raw data.
        //

        if ( ! _tileBuffer->sampleCountTableCompressor ||
            _tileBuffer->sampleCountTableSize >= _ofd->maxSampleCountTableSize)
        {
            _tileBuffer->sampleCountTableSize = _ofd->maxSampleCountTableSize;
            _tileBuffer->sampleCountTablePtr = _tileBuffer->sampleCountTableBuffer;
        }

        //
        // Compress the contents of the tileBuffer,
        // and store the compressed data in the output file.
        //

        _tileBuffer->dataSize = writePtr - _tileBuffer->buffer;
        _tileBuffer->uncompressedSize = _tileBuffer->dataSize;
        _tileBuffer->dataPtr = _tileBuffer->buffer;

        // (TODO) don't do this all the time.
        if (_tileBuffer->compressor != 0)
            delete _tileBuffer->compressor;
        _tileBuffer->compressor = newTileCompressor
                                    (_ofd->header.compression(),
                                     maxBytesPerTileLine,
                                     _ofd->tileDesc.ySize,
                                     _ofd->header);

        if (_tileBuffer->compressor)
        {
            const char *compPtr;

            Int64 compSize = _tileBuffer->compressor->compressTile
                                                (_tileBuffer->dataPtr,
                                                 _tileBuffer->dataSize,
                                                 tileRange, compPtr);

            if (compSize < _tileBuffer->dataSize)
            {
                _tileBuffer->dataSize = compSize;
                _tileBuffer->dataPtr = compPtr;
            }
            else if (_ofd->format == Compressor::NATIVE)
            {
                //
                // The data did not shrink during compression, but
                // we cannot write to the file using native format,
                // so we need to convert the lineBuffer to Xdr.
                //

                convertToXdr (_ofd, _tileBuffer->buffer, numScanLines,
                              bytesPerLine);
            }
        }
    }
    catch (std::exception &e)
    {
        if (!_tileBuffer->hasException)
        {
            _tileBuffer->exception = e.what ();
            _tileBuffer->hasException = true;
        }
    }
    catch (...)
    {
        if (!_tileBuffer->hasException)
        {
            _tileBuffer->exception = "unrecognized exception";
            _tileBuffer->hasException = true;
        }
    }
}

} // namespace


DeepTiledOutputFile::DeepTiledOutputFile
    (const char fileName[],
     const Header &header,
     int numThreads)
:
    _data (new Data (numThreads))

{
    _data->_streamData=new OutputStreamMutex();
    _data->_deleteStream =true;
    try
    {
        header.sanityCheck (true);
        _data->_streamData->os = new StdOFStream (fileName);
        initialize (header);
        _data->_streamData->currentPosition = _data->_streamData->os->tellp();

        // Write header and empty offset table to the file.
        writeMagicNumberAndVersionField(*_data->_streamData->os, _data->header);
        _data->previewPosition = _data->header.writeTo (*_data->_streamData->os, true);
        _data->tileOffsetsPosition = _data->tileOffsets.writeTo (*_data->_streamData->os);
	_data->multipart = false;
    }
    catch (IEX_NAMESPACE::BaseExc &e)
    {
        if (_data && _data->_streamData && _data->_streamData->os) delete _data->_streamData->os;
        if (_data && _data->_streamData)     delete _data->_streamData;
        if (_data)           delete _data;

        REPLACE_EXC (e, "Cannot open image file "
                        "\"" << fileName << "\". " << e);
        throw;
    }
    catch (...)
    {
        if (_data && _data->_streamData && _data->_streamData->os) delete _data->_streamData->os;
        if (_data->_streamData)     delete _data->_streamData;
        if (_data)           delete _data;

        throw;
    }
}


DeepTiledOutputFile::DeepTiledOutputFile
    (OPENEXR_IMF_INTERNAL_NAMESPACE::OStream &os,
     const Header &header,
     int numThreads)
:
    _data (new Data (numThreads))
{
    _data->_streamData=new OutputStreamMutex();
    _data->_deleteStream=false;
    
    try
    {
        header.sanityCheck(true);
        _data->_streamData->os = &os;
        initialize (header);
        _data->_streamData->currentPosition = _data->_streamData->os->tellp();

        // Write header and empty offset table to the file.
        writeMagicNumberAndVersionField(*_data->_streamData->os, _data->header);
        _data->previewPosition = _data->header.writeTo (*_data->_streamData->os, true);
        _data->tileOffsetsPosition = _data->tileOffsets.writeTo (*_data->_streamData->os);
	_data->multipart = false;
    }
    catch (IEX_NAMESPACE::BaseExc &e)
    {
        if (_data && _data->_streamData) delete _data->_streamData;
        if (_data)       delete _data;

        REPLACE_EXC (e, "Cannot open image file "
                        "\"" << os.fileName() << "\". " << e);
        throw;
    }
    catch (...)
    {
        if (_data && _data->_streamData) delete _data->_streamData;
        if (_data)       delete _data;

        throw;
    }
}

DeepTiledOutputFile::DeepTiledOutputFile(const OutputPartData* part) 
{
   
    try
    {
        if (part->header.type() != DEEPTILE)
            throw IEX_NAMESPACE::ArgExc("Can't build a DeepTiledOutputFile from "
                              "a type-mismatched part.");

        _data = new Data (part->numThreads);
        _data->_streamData=part->mutex;
        _data->_deleteStream=false;
        initialize(part->header);
        _data->partNumber = part->partNumber;
        _data->tileOffsetsPosition = part->chunkOffsetTablePosition;
        _data->previewPosition = part->previewPosition;
	_data->multipart = part->multipart;
    }
    catch (IEX_NAMESPACE::BaseExc &e)
    {
        if (_data) delete _data;

        REPLACE_EXC (e, "Cannot initialize output part "
                        "\"" << part->partNumber << "\". " << e);
        throw;
    }
    catch (...)
    {
        if (_data) delete _data;

        throw;
    }
}

void
DeepTiledOutputFile::initialize (const Header &header)
{
    _data->header = header;
    _data->header.setType(DEEPTILE);
    _data->lineOrder = _data->header.lineOrder();

    //
    // Check that the file is indeed tiled
    //

    _data->tileDesc = _data->header.tileDescription();

    //
    // Save the dataWindow information
    //

    const Box2i &dataWindow = _data->header.dataWindow();
    _data->minX = dataWindow.min.x;
    _data->maxX = dataWindow.max.x;
    _data->minY = dataWindow.min.y;
    _data->maxY = dataWindow.max.y;

    //
    // Precompute level and tile information to speed up utility functions
    //

    precalculateTileInfo (_data->tileDesc,
                          _data->minX, _data->maxX,
                          _data->minY, _data->maxY,
                          _data->numXTiles, _data->numYTiles,
                          _data->numXLevels, _data->numYLevels);

    //
    // Determine the first tile coordinate that we will be writing
    // if the file is not RANDOM_Y.
    //

    _data->nextTileToWrite = (_data->lineOrder == INCREASING_Y)?
                               TileCoord (0, 0, 0, 0):
                               TileCoord (0, _data->numYTiles[0] - 1, 0, 0);

    Compressor* compressor = newTileCompressor
                                (_data->header.compression(),
                                 0,
                                 _data->tileDesc.ySize,
                                 _data->header);

    _data->format = defaultFormat (compressor);

    if (compressor != 0)
        delete compressor;

    _data->tileOffsets = TileOffsets (_data->tileDesc.mode,
                                      _data->numXLevels,
                                      _data->numYLevels,
                                      _data->numXTiles,
                                      _data->numYTiles);
                                      
    //ignore the existing value of chunkCount - correct it if it's wrong
    _data->header.setChunkCount(getChunkOffsetTableSize(_data->header,true));                                   
                                      
    _data->maxSampleCountTableSize = _data->tileDesc.ySize *
                                     _data->tileDesc.xSize *
                                     sizeof(int);

                                     
    for (size_t i = 0; i < _data->tileBuffers.size(); i++)
    {
        _data->tileBuffers[i] = new TileBuffer ();

        _data->tileBuffers[i]->sampleCountTableBuffer.
                resizeErase(_data->maxSampleCountTableSize);

        char * p = &(_data->tileBuffers[i]->sampleCountTableBuffer[0]);
        memset (p, 0, _data->maxSampleCountTableSize);

        _data->tileBuffers[i]->sampleCountTableCompressor =
                newCompressor (_data->header.compression(),
                               _data->maxSampleCountTableSize,
                               _data->header);
    }
}


DeepTiledOutputFile::~DeepTiledOutputFile ()
{
    if (_data)
    {
        {
            Lock lock(*_data->_streamData);
            Int64 originalPosition = _data->_streamData->os->tellp();

            if (_data->tileOffsetsPosition > 0)
            {
                try
                {
                    _data->_streamData->os->seekp (_data->tileOffsetsPosition);
                    _data->tileOffsets.writeTo (*_data->_streamData->os);

                    //
                    // Restore the original position.
                    //
                    _data->_streamData->os->seekp (originalPosition);
                }
                catch (...)
                {
                    //
                    // We cannot safely throw any exceptions from here.
                    // This destructor may have been called because the
                    // stack is currently being unwound for another
                    // exception.
                    //
                }
            }
        }

        if (_data->_deleteStream && _data->_streamData)
            delete _data->_streamData->os;

        //
        // (TODO) we should have a way to tell if the stream data is owned by
        // this file or by a parent multipart file.
        //

        if (_data->partNumber == -1 && _data->_streamData)
            delete _data->_streamData;

        delete _data;
    }
}


const char *
DeepTiledOutputFile::fileName () const
{
    return _data->_streamData->os->fileName();
}


const Header &
DeepTiledOutputFile::header () const
{
    return _data->header;
}


void
DeepTiledOutputFile::setFrameBuffer (const DeepFrameBuffer &frameBuffer)
{
    Lock lock (*_data->_streamData);

    //
    // Check if the new frame buffer descriptor
    // is compatible with the image file header.
    //

    const ChannelList &channels = _data->header.channels();

    for (ChannelList::ConstIterator i = channels.begin();
         i != channels.end();
         ++i)
    {
        DeepFrameBuffer::ConstIterator j = frameBuffer.find (i.name());

        if (j == frameBuffer.end())
            continue;

        if (i.channel().type != j.slice().type)
            THROW (IEX_NAMESPACE::ArgExc, "Pixel type of \"" << i.name() << "\" channel "
                                "of output file \"" << fileName() << "\" is "
                                "not compatible with the frame buffer's "
                                "pixel type.");

        if (j.slice().xSampling != 1 || j.slice().ySampling != 1)
            THROW (IEX_NAMESPACE::ArgExc, "All channels in a tiled file must have"
                                "sampling (1,1).");
    }

    //
    // Store the pixel sample count table.
    //

    const Slice& sampleCountSlice = frameBuffer.getSampleCountSlice();
    if (sampleCountSlice.base == 0)
    {
        throw IEX_NAMESPACE::ArgExc ("Invalid base pointer, please set a proper sample count slice.");
    }
    else
    {
        _data->sampleCountSliceBase = sampleCountSlice.base;
        _data->sampleCountXStride = sampleCountSlice.xStride;
        _data->sampleCountYStride = sampleCountSlice.yStride;
        _data->sampleCountXTileCoords = sampleCountSlice.xTileCoords;
        _data->sampleCountYTileCoords = sampleCountSlice.yTileCoords;
    }

    //
    // Initialize slice table for writePixels().
    // Pixel sample count slice is not presented in the header,
    // so it wouldn't be added here.
    // Store the pixel base pointer table.
    //

    vector<TOutSliceInfo*> slices;

    for (ChannelList::ConstIterator i = channels.begin();
         i != channels.end();
         ++i)
    {
        DeepFrameBuffer::ConstIterator j = frameBuffer.find (i.name());

        if (j == frameBuffer.end())
        {
            //
            // Channel i is not present in the frame buffer.
            // In the file, channel i will contain only zeroes.
            //

            slices.push_back (new TOutSliceInfo (i.channel().type,
                                                 0, // sampleStride,
                                                 0, // xStride
                                                 0, // yStride
                                                 true)); // zero
        }
        else
        {
            //
            // Channel i is present in the frame buffer.
            //

            slices.push_back (new TOutSliceInfo (j.slice().type,
                                                 j.slice().sampleStride,
                                                 j.slice().xStride,
                                                 j.slice().yStride,
                                                 false, // zero
                                                 (j.slice().xTileCoords)? 1: 0,
                                                 (j.slice().yTileCoords)? 1: 0));

            TOutSliceInfo* slice = slices.back();
            slice->base = j.slice().base;
            
        }
    }

    //
    // Store the new frame buffer.
    //

    _data->frameBuffer = frameBuffer;

    for (size_t i = 0; i < _data->slices.size(); i++)
        delete _data->slices[i];
    _data->slices = slices;
}


const DeepFrameBuffer &
DeepTiledOutputFile::frameBuffer () const
{
    Lock lock (*_data->_streamData);
    return _data->frameBuffer;
}


void
DeepTiledOutputFile::writeTiles (int dx1, int dx2, int dy1, int dy2,
                             int lx, int ly)
{
    try
    {
        Lock lock (*_data->_streamData);

        if (_data->slices.size() == 0)
            throw IEX_NAMESPACE::ArgExc ("No frame buffer specified "
                               "as pixel data source.");

        if (!isValidTile (dx1, dy1, lx, ly) || !isValidTile (dx2, dy2, lx, ly))
            throw IEX_NAMESPACE::ArgExc ("Tile coordinates are invalid.");

        if (!isValidLevel (lx, ly))
            THROW (IEX_NAMESPACE::ArgExc,
                   "Level coordinate "
                   "(" << lx << ", " << ly << ") "
                   "is invalid.");
        //
        // Determine the first and last tile coordinates in both dimensions
        // based on the file's lineOrder
        //

        if (dx1 > dx2)
            swap (dx1, dx2);

        if (dy1 > dy2)
            swap (dy1, dy2);

        int dyStart = dy1;
        int dyStop  = dy2 + 1;
        int dY      = 1;

        if (_data->lineOrder == DECREASING_Y)
        {
            dyStart = dy2;
            dyStop  = dy1 - 1;
            dY      = -1;
        }

        int numTiles = (dx2 - dx1 + 1) * (dy2 - dy1 + 1);
        int numTasks = min ((int)_data->tileBuffers.size(), numTiles);

        //
        // Create a task group for all tile buffer tasks.  When the
        // task group goes out of scope, the destructor waits until
        // all tasks are complete.
        //

        {
            TaskGroup taskGroup;

            //
            // Add in the initial compression tasks to the thread pool
            //

            int nextCompBuffer = 0;
            int dxComp         = dx1;
            int dyComp         = dyStart;

            while (nextCompBuffer < numTasks)
            {
                ThreadPool::addGlobalTask (new TileBufferTask (&taskGroup,
                                                               _data,
                                                               nextCompBuffer++,
                                                               dxComp, dyComp,
                                                               lx, ly));
                dxComp++;

                if (dxComp > dx2)
                {
                    dxComp = dx1;
                    dyComp += dY;
                }
            }

            //
            // Write the compressed buffers and add in more compression
            // tasks until done
            //

            int nextWriteBuffer = 0;
            int dxWrite         = dx1;
            int dyWrite         = dyStart;

            while (nextWriteBuffer < numTiles)
            {
                //
                // Wait until the nextWriteBuffer is ready to be written
                //

                TileBuffer* writeBuffer =
                                    _data->getTileBuffer (nextWriteBuffer);

                writeBuffer->wait();

                //
                // Write the tilebuffer
                //

                bufferedTileWrite ( _data, dxWrite, dyWrite, lx, ly,
                                   writeBuffer->dataPtr,
                                   writeBuffer->dataSize,
                                   writeBuffer->uncompressedSize,
                                   writeBuffer->sampleCountTablePtr,
                                   writeBuffer->sampleCountTableSize);

                //
                // Release the lock on nextWriteBuffer
                //

                writeBuffer->post();

                //
                // If there are no more tileBuffers to compress, then
                // only continue to write out remaining tileBuffers,
                // otherwise keep adding compression tasks.
                //

                if (nextCompBuffer < numTiles)
                {
                    //
                    // add nextCompBuffer as a compression Task
                    //

                    ThreadPool::addGlobalTask
                        (new TileBufferTask (&taskGroup,
                                             _data,
                                             nextCompBuffer,
                                             dxComp, dyComp,
                                             lx, ly));
                }

                nextWriteBuffer++;
                dxWrite++;

                if (dxWrite > dx2)
                {
                    dxWrite = dx1;
                    dyWrite += dY;
                }

                nextCompBuffer++;
                dxComp++;

                if (dxComp > dx2)
                {
                    dxComp = dx1;
                    dyComp += dY;
                }
            }

            //
            // finish all tasks
            //
        }

        //
        // Exeption handling:
        //
        // TileBufferTask::execute() may have encountered exceptions, but
        // those exceptions occurred in another thread, not in the thread
        // that is executing this call to TiledOutputFile::writeTiles().
        // TileBufferTask::execute() has caught all exceptions and stored
        // the exceptions' what() strings in the tile buffers.
        // Now we check if any tile buffer contains a stored exception; if
        // this is the case then we re-throw the exception in this thread.
        // (It is possible that multiple tile buffers contain stored
        // exceptions.  We re-throw the first exception we find and
        // ignore all others.)
        //

        const string *exception = 0;

        for (size_t i = 0; i < _data->tileBuffers.size(); ++i)
        {
            TileBuffer *tileBuffer = _data->tileBuffers[i];

            if (tileBuffer->hasException && !exception)
                exception = &tileBuffer->exception;

            tileBuffer->hasException = false;
        }

        if (exception)
            throw IEX_NAMESPACE::IoExc (*exception);
    }
    catch (IEX_NAMESPACE::BaseExc &e)
    {
        REPLACE_EXC (e, "Failed to write pixel data to image "
                        "file \"" << fileName() << "\". " << e);
        throw;
    }
}


void
DeepTiledOutputFile::writeTiles (int dx1, int dxMax, int dyMin, int dyMax, int l)
{
    writeTiles (dx1, dxMax, dyMin, dyMax, l, l);
}


void
DeepTiledOutputFile::writeTile (int dx, int dy, int lx, int ly)
{
    writeTiles (dx, dx, dy, dy, lx, ly);
}


void
DeepTiledOutputFile::writeTile (int dx, int dy, int l)
{
    writeTile(dx, dy, l, l);
}


void
DeepTiledOutputFile::copyPixels (DeepTiledInputFile &in)
{

   //
   // Check if this file's and and the InputFile's
   // headers are compatible.
   //

   const Header &hdr = _data->header;
   const Header &inHdr = in.header();

   
   
   if (!(hdr.tileDescription() == inHdr.tileDescription()))
        THROW (IEX_NAMESPACE::ArgExc, "Quick pixel copy from image "
                            "file \"" << in.fileName() << "\" to image "
                            "file \"" << fileName() << "\" failed. "
                            "The files have different tile descriptions.");

   if (!(hdr.dataWindow() == inHdr.dataWindow()))
        THROW (IEX_NAMESPACE::ArgExc, "Cannot copy pixels from image "
                            "file \"" << in.fileName() << "\" to image "
                            "file \"" << fileName() << "\". The "
                            "files have different data windows.");

    if (!(hdr.lineOrder() == inHdr.lineOrder()))
        THROW (IEX_NAMESPACE::ArgExc, "Quick pixel copy from image "
                            "file \"" << in.fileName() << "\" to image "
                            "file \"" << fileName() << "\" failed. "
                            "The files have different line orders.");

    if (!(hdr.compression() == inHdr.compression()))
        THROW (IEX_NAMESPACE::ArgExc, "Quick pixel copy from image "
                            "file \"" << in.fileName() << "\" to image "
                            "file \"" << fileName() << "\" failed. "
                            "The files use different compression methods.");

    if (!(hdr.channels() == inHdr.channels()))
        THROW (IEX_NAMESPACE::ArgExc, "Quick pixel copy from image "
                             "file \"" << in.fileName() << "\" to image "
                             "file \"" << fileName() << "\" "
                             "failed.  The files have different channel "
                             "lists.");


    // Verify that no pixel data have been written to this file yet.
    //

    if (!_data->tileOffsets.isEmpty())
        THROW (IEX_NAMESPACE::LogicExc, "Quick pixel copy from image "
                              "file \"" << in.fileName() << "\" to image "
                              "file \"" << _data->_streamData->os->fileName() << "\" "
                              "failed. \"" << fileName() << "\" "
                              "already contains pixel data.");

 
    int numAllTiles = in.totalTiles();                              
                              
    Lock lock (*_data->_streamData);
    
    //
    // special handling for random tiles
    //
    
    vector<int> dx_list(_data->lineOrder==RANDOM_Y ? numAllTiles : 1);
    vector<int> dy_list(_data->lineOrder==RANDOM_Y ? numAllTiles : 1);
    vector<int> lx_list(_data->lineOrder==RANDOM_Y ? numAllTiles : 1);
    vector<int> ly_list(_data->lineOrder==RANDOM_Y ? numAllTiles : 1);
    
    if(_data->lineOrder==RANDOM_Y)
    {
        in.getTileOrder(&dx_list[0],&dy_list[0],&lx_list[0],&ly_list[0]);
        _data->nextTileToWrite.dx=dx_list[0];
        _data->nextTileToWrite.dy=dy_list[0];
        _data->nextTileToWrite.lx=lx_list[0];
        _data->nextTileToWrite.ly=ly_list[0];
    }
    

    vector<char> data(4096);
    for (int i = 0; i < numAllTiles; ++i)
    {

        int dx = _data->nextTileToWrite.dx;
        int dy = _data->nextTileToWrite.dy;
        int lx = _data->nextTileToWrite.lx;
        int ly = _data->nextTileToWrite.ly;

        Int64 dataSize = data.size();

        in.rawTileData (dx, dy, lx, ly, &data[0], dataSize);
        if(dataSize>data.size())
        {
            data.resize(dataSize);
            in.rawTileData (dx, dy, lx, ly, &data[0], dataSize);
        }
        Int64 sampleCountTableSize = *(Int64 *)(&data[0] + 16);
        Int64 pixelDataSize = *(Int64 *)(&data[0] + 24);
        Int64 unpackedPixelDataSize = *(Int64 *)(&data[0] + 32);
        char * sampleCountTable = &data[0]+40;
        char * pixelData = sampleCountTable + sampleCountTableSize;
        
        writeTileData (_data, dx, dy, lx, ly, pixelData, pixelDataSize,unpackedPixelDataSize,sampleCountTable,sampleCountTableSize);
        
        
        if(_data->lineOrder==RANDOM_Y)
        {
            if(i<numAllTiles-1)
            {
              _data->nextTileToWrite.dx=dx_list[i+1];
              _data->nextTileToWrite.dy=dy_list[i+1];
              _data->nextTileToWrite.lx=lx_list[i+1];
              _data->nextTileToWrite.ly=ly_list[i+1];
            }
        }else{   
          _data->nextTileToWrite = _data->nextTileCoord (_data->nextTileToWrite);
        }
        
    }
}


void
DeepTiledOutputFile::copyPixels (DeepTiledInputPart &in)
{
  copyPixels(*in.file);
}


unsigned int
DeepTiledOutputFile::tileXSize () const
{
    return _data->tileDesc.xSize;
}


unsigned int
DeepTiledOutputFile::tileYSize () const
{
    return _data->tileDesc.ySize;
}


LevelMode
DeepTiledOutputFile::levelMode () const
{
    return _data->tileDesc.mode;
}


LevelRoundingMode
DeepTiledOutputFile::levelRoundingMode () const
{
    return _data->tileDesc.roundingMode;
}


int
DeepTiledOutputFile::numLevels () const
{
    if (levelMode() == RIPMAP_LEVELS)
        THROW (IEX_NAMESPACE::LogicExc, "Error calling numLevels() on image "
                              "file \"" << fileName() << "\" "
                              "(numLevels() is not defined for RIPMAPs).");
    return _data->numXLevels;
}


int
DeepTiledOutputFile::numXLevels () const
{
    return _data->numXLevels;
}


int
DeepTiledOutputFile::numYLevels () const
{
    return _data->numYLevels;
}


bool
DeepTiledOutputFile::isValidLevel (int lx, int ly) const
{
    if (lx < 0 || ly < 0)
        return false;

    if (levelMode() == MIPMAP_LEVELS && lx != ly)
        return false;

    if (lx >= numXLevels() || ly >= numYLevels())
        return false;

    return true;
}


int
DeepTiledOutputFile::levelWidth (int lx) const
{
    try
    {
        int retVal = levelSize (_data->minX, _data->maxX, lx,
                                _data->tileDesc.roundingMode);

        return retVal;
    }
    catch (IEX_NAMESPACE::BaseExc &e)
    {
        REPLACE_EXC (e, "Error calling levelWidth() on image "
                        "file \"" << fileName() << "\". " << e);
        throw;
    }
}


int
DeepTiledOutputFile::levelHeight (int ly) const
{
    try
    {
        return levelSize (_data->minY, _data->maxY, ly,
                          _data->tileDesc.roundingMode);
    }
    catch (IEX_NAMESPACE::BaseExc &e)
    {
        REPLACE_EXC (e, "Error calling levelHeight() on image "
                        "file \"" << fileName() << "\". " << e);
        throw;
    }
}


int
DeepTiledOutputFile::numXTiles (int lx) const
{
    if (lx < 0 || lx >= _data->numXLevels)
        THROW (IEX_NAMESPACE::LogicExc, "Error calling numXTiles() on image "
                              "file \"" << _data->_streamData->os->fileName() << "\" "
                              "(Argument is not in valid range).");

    return _data->numXTiles[lx];
}


int
DeepTiledOutputFile::numYTiles (int ly) const
{
   if (ly < 0 || ly >= _data->numYLevels)
        THROW (IEX_NAMESPACE::LogicExc, "Error calling numXTiles() on image "
                              "file \"" << _data->_streamData->os->fileName() << "\" "
                              "(Argument is not in valid range).");

    return _data->numYTiles[ly];
}


Box2i
DeepTiledOutputFile::dataWindowForLevel (int l) const
{
    return dataWindowForLevel (l, l);
}


Box2i
DeepTiledOutputFile::dataWindowForLevel (int lx, int ly) const
{
    try
    {
        return OPENEXR_IMF_INTERNAL_NAMESPACE::dataWindowForLevel (
                _data->tileDesc,
                _data->minX, _data->maxX,
                _data->minY, _data->maxY,
                lx, ly);
    }
    catch (IEX_NAMESPACE::BaseExc &e)
    {
        REPLACE_EXC (e, "Error calling dataWindowForLevel() on image "
                        "file \"" << fileName() << "\". " << e);
        throw;
    }
}


Box2i
DeepTiledOutputFile::dataWindowForTile (int dx, int dy, int l) const
{
    return dataWindowForTile (dx, dy, l, l);
}


Box2i
DeepTiledOutputFile::dataWindowForTile (int dx, int dy, int lx, int ly) const
{
    try
    {
        if (!isValidTile (dx, dy, lx, ly))
            throw IEX_NAMESPACE::ArgExc ("Arguments not in valid range.");

        return OPENEXR_IMF_INTERNAL_NAMESPACE::dataWindowForTile (
                _data->tileDesc,
                _data->minX, _data->maxX,
                _data->minY, _data->maxY,
                dx, dy,
                lx, ly);
    }
    catch (IEX_NAMESPACE::BaseExc &e)
    {
        REPLACE_EXC (e, "Error calling dataWindowForTile() on image "
                        "file \"" << fileName() << "\". " << e);
        throw;
    }
}


bool
DeepTiledOutputFile::isValidTile (int dx, int dy, int lx, int ly) const
{
    return ((lx < _data->numXLevels && lx >= 0) &&
            (ly < _data->numYLevels && ly >= 0) &&
            (dx < _data->numXTiles[lx] && dx >= 0) &&
            (dy < _data->numYTiles[ly] && dy >= 0));
}


void
DeepTiledOutputFile::updatePreviewImage (const PreviewRgba newPixels[])
{
    Lock lock (*_data->_streamData);

    if (_data->previewPosition <= 0)
        THROW (IEX_NAMESPACE::LogicExc, "Cannot update preview image pixels. "
                              "File \"" << fileName() << "\" does not "
                              "contain a preview image.");

    //
    // Store the new pixels in the header's preview image attribute.
    //

    PreviewImageAttribute &pia =
        _data->header.typedAttribute <PreviewImageAttribute> ("preview");

    PreviewImage &pi = pia.value();
    PreviewRgba *pixels = pi.pixels();
    int numPixels = pi.width() * pi.height();

    for (int i = 0; i < numPixels; ++i)
        pixels[i] = newPixels[i];

    //
    // Save the current file position, jump to the position in
    // the file where the preview image starts, store the new
    // preview image, and jump back to the saved file position.
    //

    Int64 savedPosition = _data->_streamData->os->tellp();

    try
    {
        _data->_streamData->os->seekp (_data->previewPosition);
        pia.writeValueTo (*_data->_streamData->os, _data->version);
        _data->_streamData->os->seekp (savedPosition);
    }
    catch (IEX_NAMESPACE::BaseExc &e)
    {
        REPLACE_EXC (e, "Cannot update preview image pixels for "
                        "file \"" << fileName() << "\". " << e);
        throw;
    }
}


void
DeepTiledOutputFile::breakTile
    (int dx, int dy,
     int lx, int ly,
     int offset,
     int length,
     char c)
{
    Lock lock (*_data->_streamData);

    Int64 position = _data->tileOffsets (dx, dy, lx, ly);

    if (!position)
        THROW (IEX_NAMESPACE::ArgExc,
               "Cannot overwrite tile "
               "(" << dx << ", " << dy << ", " << lx << "," << ly << "). "
               "The tile has not yet been stored in "
               "file \"" << fileName() << "\".");

    _data->_streamData->currentPosition = 0;
    _data->_streamData->os->seekp (position + offset);

    for (int i = 0; i < length; ++i)
        _data->_streamData->os->write (&c, 1);
}

OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT