ddib.h

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/* ////////////////////////////////////////////////////////////////////////
//
//                  INTEL CORPORATION PROPRIETARY INFORMATION
//     This software is supplied under the terms of a license agreement or
//     nondisclosure agreement with Intel Corporation and may not be copied
//     or disclosed except in accordance with the terms of that agreement.
//          Copyright(c) 2004-2005 Intel Corporation. All Rights Reserved.
//
//
//
*/

#ifndef __DDIB_H__
#define __DDIB_H__

#include "ddibfileheader.h"
#include "ddibinfo.h"
#include "ddibimagedata.h"
#include "bdiagnoutput.h"

template<class ByteInput>
class DIBDecoder
{
public:
    DIBDecoder() : m_stream(0), m_imageDataOffset(0) {}

    const DIBInfo &Info() const { return m_info; }

    void Attach(ByteInput &stream) { m_stream = &stream; m_imageDataOffset = 0; }
    void Detach()                  { m_stream = 0;       m_imageDataOffset = 0; }

    void AttachDiagnOutput(BDiagnOutput &diagnOutput)
    {
        m_diagnOutputPtr = diagnOutput;
        m_info.AttachDiagnOutput(diagnOutput);
    }

    void ReadFileHeader()          { ReadDIBFileHeader(Stream(), m_imageDataOffset, m_diagnOutputPtr); }

    void ReadInfo()
    {
        unsigned int prologSize = Stream().Position();
        m_info.Read(Stream());
        prologSize = Stream().Position() - prologSize + DIB_FILE_HEADER_N_OF_BYTES;

        if(m_imageDataOffset < prologSize)
        {
            m_diagnOutputPtr->Warning(DiagnDescrCT<DDIBWarning, DIBImageDataOffsetMismatch>());
        }
        else
            Stream().Seek(m_imageDataOffset - prologSize);
    }

    template<class T>
        void ReadImageData(const ImageCoreC<T, 1> *channel) { ReadDIBImageData(Stream(), m_info, channel); }

protected:
    ByteInput      *m_stream;
    BDiagnOutputPtr m_diagnOutputPtr;
    DDIBInfo        m_info;
    unsigned int    m_imageDataOffset;

    ByteInput    &Stream() { return *m_stream; }
};

#endif // __DDIB_H__