dcmjpls/libcharls/procline.h

//
// (C) Jan de Vaan 2007-2010, all rights reserved. See the accompanying "License.txt" for licensed use.
//
#ifndef CHARLS_PROCESSLINE
#define CHARLS_PROCESSLINE

#include "clrtrans.h"

//
// This file defines the ProcessLine base class, its derivitives and helper functions.
// During coding/decoding, CharLS process one line at a time. The different Processline implementations
// convert the uncompressed format to and from the internal format for encoding.
// Conversions include color transforms, line interleaved vs sample interleaved, masking out unused bits,
// accounting for line padding etc.
// This mechanism could be used to encode/decode images as they are received.
//

class ProcessLine
{
public:
    virtual ~ProcessLine() {}
    virtual void NewLineDecoded(const void* pSrc, int pixelCount, int bytesperline) = 0;
    virtual void NewLineRequested(void* pSrc, int pixelCount, int bytesperline) = 0;
};


class PostProcesSingleComponent : public ProcessLine
{
public:
    PostProcesSingleComponent(void* pbyteOutput, const JlsParameters& info, int bytesPerPixel) :
        _pbyteOutput((BYTE*)pbyteOutput),
        _bytesPerPixel(bytesPerPixel),
        _bytesPerLine(info.bytesperline)
    {
    }

    void NewLineRequested(void* pDst, int pixelCount, int /*byteStride*/)
    {
        OFBitmanipTemplate<BYTE>::copyMem(_pbyteOutput, (BYTE*) pDst, pixelCount * _bytesPerPixel);
        _pbyteOutput += _bytesPerLine;
    }

    void NewLineDecoded(const void* pSrc, int pixelCount, int /*byteStride*/)
    {
        OFBitmanipTemplate<BYTE>::copyMem((BYTE*) pSrc, _pbyteOutput, pixelCount * _bytesPerPixel);
        _pbyteOutput += _bytesPerLine;
    }

private:
    BYTE* _pbyteOutput;
    int _bytesPerPixel;
    int _bytesPerLine;
};


template<class TRANSFORM, class SAMPLE>
void TransformLineToQuad(const SAMPLE* ptypeInput, LONG pixelStrideIn, Quad<SAMPLE>* pbyteBuffer, LONG pixelStride, TRANSFORM& transform)
{
    int cpixel = MIN(pixelStride, pixelStrideIn);
    Quad<SAMPLE>* ptypeBuffer = (Quad<SAMPLE>*)pbyteBuffer;

    for (int x = 0; x < cpixel; ++x)
    {
        Quad<SAMPLE> pixel(transform(ptypeInput[x], ptypeInput[x + pixelStrideIn], ptypeInput[x + 2*pixelStrideIn]),ptypeInput[x + 3*pixelStrideIn]) ;

        ptypeBuffer[x] = pixel;
    }
}


template<class TRANSFORM, class SAMPLE>
void TransformQuadToLine(const Quad<SAMPLE>* pbyteInput, LONG pixelStrideIn, SAMPLE* ptypeBuffer, LONG pixelStride, TRANSFORM& transform)
{
    int cpixel = MIN(pixelStride, pixelStrideIn);
    const Quad<SAMPLE>* ptypeBufferIn = (Quad<SAMPLE>*)pbyteInput;

    for (int x = 0; x < cpixel; ++x)
    {
        Quad<SAMPLE> color = ptypeBufferIn[x];
        Quad<SAMPLE> colorTranformed(transform(color.v1, color.v2, color.v3), color.v4);

        ptypeBuffer[x] = colorTranformed.v1;
        ptypeBuffer[x + pixelStride] = colorTranformed.v2;
        ptypeBuffer[x + 2 *pixelStride] = colorTranformed.v3;
        ptypeBuffer[x + 3 *pixelStride] = colorTranformed.v4;
    }
}


template<class SAMPLE>
void TransformRgbToBgr(SAMPLE* pDest, int samplesPerPixel, int pixelCount)
{
    for (int i = 0; i < pixelCount; ++i)
    {
        SAMPLE tmp = pDest[0];
        pDest[0] = pDest[2];
        pDest[2] = tmp;
        pDest += samplesPerPixel;
    }
}


template<class TRANSFORM, class SAMPLE>
void TransformLine(Triplet<SAMPLE>* pDest, const Triplet<SAMPLE>* pSrc, int pixelCount, TRANSFORM& transform)
{
    for (int i = 0; i < pixelCount; ++i)
    {
        pDest[i] = transform(pSrc[i].v1, pSrc[i].v2, pSrc[i].v3);
    }
}


template<class TRANSFORM, class SAMPLE>
void TransformLineToTriplet(const SAMPLE* ptypeInput, LONG pixelStrideIn, Triplet<SAMPLE>* pbyteBuffer, LONG pixelStride, TRANSFORM& transform)
{
    int cpixel = MIN(pixelStride, pixelStrideIn);
    Triplet<SAMPLE>* ptypeBuffer = (Triplet<SAMPLE>*)pbyteBuffer;

    for (int x = 0; x < cpixel; ++x)
    {
        ptypeBuffer[x] = transform(ptypeInput[x], ptypeInput[x + pixelStrideIn], ptypeInput[x + 2*pixelStrideIn]);
    }
}


template<class TRANSFORM, class SAMPLE>
void TransformTripletToLine(const Triplet<SAMPLE>* pbyteInput, LONG pixelStrideIn, SAMPLE* ptypeBuffer, LONG pixelStride, TRANSFORM& transform)
{
    int cpixel = MIN(pixelStride, pixelStrideIn);
    const Triplet<SAMPLE>* ptypeBufferIn = (Triplet<SAMPLE>*)pbyteInput;

    for (int x = 0; x < cpixel; ++x)
    {
        Triplet<SAMPLE> color = ptypeBufferIn[x];
        Triplet<SAMPLE> colorTranformed = transform(color.v1, color.v2, color.v3);

        ptypeBuffer[x] = colorTranformed.v1;
        ptypeBuffer[x + pixelStride] = colorTranformed.v2;
        ptypeBuffer[x + 2 *pixelStride] = colorTranformed.v3;
    }
}


template<class TRANSFORM>
class ProcessTransformed : public ProcessLine
{
    typedef typename TRANSFORM::SAMPLE SAMPLE;

    ProcessTransformed(const ProcessTransformed&) {}
public:
    ProcessTransformed(void* pbyteOutput, const JlsParameters& info, TRANSFORM transform) :
        _pbyteOutput((BYTE*)pbyteOutput),
        _info(info),
        _templine(info.width *  info.components),
        _transform(transform),
        _inverseTransform(transform)
    {
//      ASSERT(_info.components == sizeof(TRIPLET)/sizeof(TRIPLET::SAMPLE));
    }


    void NewLineRequested(void* pDst, int pixelCount, int stride)
    {
        SAMPLE* pLine = (SAMPLE*)_pbyteOutput;
        if (_info.outputBgr)
        {
            pLine = &_templine[0];
            memcpy(pLine, _pbyteOutput, sizeof(Triplet<SAMPLE>)*pixelCount);
            TransformRgbToBgr(pLine, _info.components, pixelCount);
        }

        if (_info.components == 3)
        {
            if (_info.ilv == ILV_SAMPLE)
            {
                TransformLine((Triplet<SAMPLE>*)pDst, (const Triplet<SAMPLE>*)pLine, pixelCount, _transform);
            }
            else
            {
                TransformTripletToLine((const Triplet<SAMPLE>*)pLine, pixelCount, (SAMPLE*)pDst, stride, _transform);
            }
        }
        else if (_info.components == 4 && _info.ilv == ILV_LINE)
        {
            TransformQuadToLine((const Quad<SAMPLE>*)pLine, pixelCount, (SAMPLE*)pDst, stride, _transform);
        }
        _pbyteOutput += _info.bytesperline;
    }


    void NewLineDecoded(const void* pSrc, int pixelCount, int byteStride)
    {
        if (_info.components == 3)
        {
            if (_info.ilv == ILV_SAMPLE)
            {
                TransformLine((Triplet<SAMPLE>*)_pbyteOutput, (const Triplet<SAMPLE>*)pSrc, pixelCount, _inverseTransform);
            }
            else
            {
                TransformLineToTriplet((const SAMPLE*)pSrc, byteStride, (Triplet<SAMPLE>*)_pbyteOutput, pixelCount, _inverseTransform);
            }
        }
        else if (_info.components == 4 && _info.ilv == ILV_LINE)
        {
            TransformLineToQuad((const SAMPLE*)pSrc, byteStride, (Quad<SAMPLE>*)_pbyteOutput, pixelCount, _inverseTransform);
        }

        if (_info.outputBgr)
        {
            TransformRgbToBgr(_pbyteOutput, _info.components, pixelCount);
        }
        _pbyteOutput += _info.bytesperline;
    }


private:
    BYTE* _pbyteOutput;
    const JlsParameters& _info;
    OFVector<SAMPLE> _templine;
    TRANSFORM _transform;
    typename TRANSFORM::INVERSE _inverseTransform;
};



#endif

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