Sample code for using Image Stride value

Image Stride

When a video image is stored in memory, the memory buffer might contain extra padding bytes after each row of pixels. The padding bytes affect how the image is stored in memory, but do not affect how the image is displayed.
The stride is the number of bytes from one row of pixels in memory to the next row of pixels in memory. Stride is also called pitch.

void ProcessVideoImage(
    BYTE*       pDestScanLine0,    
    LONG        lDestStride,       
    const BYTE* pSrcScanLine0,     
    LONG        lSrcStride,        
    DWORD       dwWidthInPixels,    
    DWORD       dwHeightInPixels
    )
{
    for (DWORD y = 0; y < dwHeightInPixels; y++)
    {
        SOURCE_PIXEL_TYPE *pSrcPixel = (SOURCE_PIXEL_TYPE*)pDestScanLine0;
        DEST_PIXEL_TYPE *pDestPixel = (DEST_PIXEL_TYPE*)pSrcScanLine0;

        for (DWORD x = 0; x < dwWidthInPixels; x +=2)
        {
            pDestPixel[x] = TransformPixelValue(pSrcPixel[x]);
        }
        pDestScanLine0 += lDestStride;
        pSrcScanLine0 += lSrcStride;
    }
}



https://msdn.microsoft.com/en-us/library/windows/desktop/aa473780(v=vs.85).aspx