imfzipcompressor.cpp

对gif

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
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//-----------------------------------------------------------------------------
//
//	class ZipCompressor
//
//-----------------------------------------------------------------------------

#include <ImfZipCompressor.h>
#include "Iex.h"
#include <zlib.h>

namespace Imf {


ZipCompressor::ZipCompressor
    (const Header &hdr,
     int maxScanLineSize,
     int numScanLines)
:
    Compressor (hdr),
    _maxScanLineSize (maxScanLineSize),
    _numScanLines (numScanLines),
    _tmpBuffer (0),
    _outBuffer (0)
{
    _tmpBuffer =
	new char [maxScanLineSize * numScanLines];

    _outBuffer =
	new char [int (ceil (maxScanLineSize * numScanLines * 1.01)) + 100];
}


ZipCompressor::~ZipCompressor ()
{
    delete [] _tmpBuffer;
    delete [] _outBuffer;
}


int
ZipCompressor::numScanLines () const
{
    return _numScanLines;
}


int
ZipCompressor::compress (const char *inPtr,
			 int inSize,
			 int minY,
			 const char *&outPtr)
{
    //
    // Special case