Method prepRGBAScanline

src/OpenColorIO/ScanlineHelper.cpp:119–150

// Copy from the src image to our scanline, in our preferred pixel layout.
template<typename InType, typename OutType>
void GenericScanlineHelper<InType, OutType>::prepRGBAScanline(float** buffer, long & numPixels)
{
    // Note that only a line-by-line processing is done on the image buffer.

    if(m_yIndex >= m_dstImg.m_height)
    {
        numPixels = 0;
        return;
    }

    *buffer = m_useDstBuffer ? (float*)(m_dstImg.m_rData + m_dstImg.m_yStrideBytes * m_yIndex)
                             : &m_rgbaFloatBuffer[0];

    if((m_inOptimizedMode&PACKED_OPTIMIZATION)==PACKED_OPTIMIZATION)
    {
        const void * inBuffer = (void*)(m_srcImg.m_rData + m_srcImg.m_yStrideBytes * m_yIndex);

        m_srcImg.m_bitDepthOp->apply(inBuffer, *buffer, m_dstImg.m_width);
    }
    else
    {
        // Pack from any channel ordering & bit-depth to a packed RGBA F32 buffer.

        Generic<InType>::PackRGBAFromImageDesc(m_srcImg,
                                               &m_inBitDepthBuffer[0],
                                               *buffer,
                                               m_dstImg.m_width,
                                               m_yIndex * m_dstImg.m_width);
    }

    numPixels = m_dstImg.m_width;
}

// Write back the result of our work, from the scanline to our destination image.
template<typename InType, typename OutType>