ImfCompressor.cpp

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
//
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// *       Redistributions in binary form must reproduce the above
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///////////////////////////////////////////////////////////////////////////



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

#include <ImfCompressor.h>
#include <ImfRleCompressor.h>
#include <ImfZipCompressor.h>
#include <ImfPizCompressor.h>
#include <ImfPxr24Compressor.h>
#include <ImfB44Compressor.h>
#include <ImfCheckedArithmetic.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, size_t 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,
           size_t tileLineSize,
           size_t numTileLines,
           const Header &hdr)
{
    switch (c)
    {
      case RLE_COMPRESSION:

    return new RleCompressor (hdr, uiMult (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