Codec.cpp

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// -*- mode: C++; tab-width: 4 -*-
// vi: ts=4

/*
 * Copyright (c) 2009, Patrick A. Palmer.
 * 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 Patrick A. Palmer 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.
 */

#include "DPX.h"
#include "Codec.h"
#include "ElementReadStream.h"
#include "ReaderInternal.h"




dpx::Codec::Codec() : scanline(0)
{
}


dpx::Codec::~Codec()
{
        if (this->scanline)
                delete [] scanline;
}


void dpx::Codec::Reset()
{
        if (this->scanline)
        {
                delete [] scanline;
                this->scanline = 0;
        }
}


bool dpx::Codec::Read(const Header &dpxHeader, ElementReadStream *fd, const int element, const Block &block, void *data, const DataSize size)
{
        // scanline buffer
        if (this->scanline == 0)
        {
                // get the number of components for this element descriptor
                const int numberOfComponents = dpxHeader.ImageElementComponentCount(element);
                
                // bit depth of the image element
                const int bitDepth = dpxHeader.BitDepth(element);
                                
                // size of the scanline buffer is image width * number of components * bytes per component
                int slsize = ((numberOfComponents * dpxHeader.Width() * 
                                          (bitDepth / 8 + (bitDepth % 8 ? 1 : 0))) / sizeof(U32))+1;

                this->scanline = new U32[slsize];
        }
        
        
        // read the image block
        return ReadImageBlock<ElementReadStream>(dpxHeader, this->scanline, fd, element, block, data, size);
}