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ImfCompressor.cpp

///////////////////////////////////////////////////////////////////////////
//
// 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
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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///////////////////////////////////////////////////////////////////////////



//-----------------------------------------------------------------------------
//
//    class Compressor
//
//-----------------------------------------------------------------------------

#include <ImfCompressor.h>
#include <ImfRleCompressor.h>
#include <ImfZipCompressor.h>
#include <ImfPizCompressor.h>
#include <ImfPxr24Compressor.h>
#include <ImfB44Compressor.h>

namespace Imf {

using Imath::Box2i;


Compressor::Compressor (const Header &hdr): _header (hdr) {}


Compressor::~Compressor () {}


Compressor::Format
Compressor::format () const
{
    return XDR;
}


int
Compressor::compressTile (const char *inPtr,
                    int inSize,
                    Box2i range,
                    const char *&outPtr)
{
    return compress (inPtr, inSize, range.min.y, outPtr);
}

             
int
Compressor::uncompressTile (const char *inPtr,
                      int inSize,
                      Box2i range,
                      const char *&outPtr)
{
    return uncompress (inPtr, inSize, range.min.y, outPtr);
}


bool  
isValidCompression (Compression c)
{
    switch (c)
    {
      case NO_COMPRESSION:
      case RLE_COMPRESSION:
      case ZIPS_COMPRESSION:
      case ZIP_COMPRESSION:
      case PIZ_COMPRESSION:
      case PXR24_COMPRESSION:
      case B44_COMPRESSION:
      case B44A_COMPRESSION:

      return true;

      default:

      return false;
    }
}


Compressor *
newCompressor (Compression c, int maxScanLineSize, const Header &hdr)
{
    switch (c)
    {
      case RLE_COMPRESSION:

      return new RleCompressor (hdr, maxScanLineSize);

      case ZIPS_COMPRESSION:

      return new ZipCompressor (hdr, maxScanLineSize, 1);

      case ZIP_COMPRESSION:

      return new ZipCompressor (hdr, maxScanLineSize, 16);

      case PIZ_COMPRESSION:

      return new PizCompressor (hdr, maxScanLineSize, 32);

      case PXR24_COMPRESSION:

      return new Pxr24Compressor (hdr, maxScanLineSize, 16);

      case B44_COMPRESSION:

      return new B44Compressor (hdr, maxScanLineSize, 32, false);

      case B44A_COMPRESSION:

      return new B44Compressor (hdr, maxScanLineSize, 32, true);

      default:

      return 0;
    }
}


Compressor *
newTileCompressor (Compression c,
               int tileLineSize,
               int numTileLines,
               const Header &hdr)
{
    switch (c)
    {
      case RLE_COMPRESSION:

      return new RleCompressor (hdr, tileLineSize * numTileLines);

      case ZIPS_COMPRESSION:
      case ZIP_COMPRESSION:

      return new ZipCompressor (hdr, tileLineSize, numTileLines);

      case PIZ_COMPRESSION:

      return new PizCompressor (hdr, tileLineSize, numTileLines);

      case PXR24_COMPRESSION:

      return new Pxr24Compressor (hdr, tileLineSize, numTileLines);

      case B44_COMPRESSION:

      return new B44Compressor (hdr, tileLineSize, numTileLines, false);

      case B44A_COMPRESSION:

      return new B44Compressor (hdr, tileLineSize, numTileLines, true);

      default:

      return 0;
    }
}


} // namespace Imf

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