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#include "precomp.hpp"

using namespace cv;
using namespace cv::cuda;

#if !defined (HAVE_CUDA) || defined (CUDA_DISABLER)

void cv::cuda::blendLinear(InputArray, InputArray, InputArray, InputArray, OutputArray, Stream&) { throw_no_cuda(); }

#else

////////////////////////////////////////////////////////////////////////
// blendLinear

namespace cv { namespace cuda { namespace device
{
    namespace blend
    {
        template <typename T>
        void blendLinearCaller(int rows, int cols, int cn, PtrStep<T> img1, PtrStep<T> img2, PtrStepf weights1, PtrStepf weights2, PtrStep<T> result, cudaStream_t stream);

        void blendLinearCaller8UC4(int rows, int cols, PtrStepb img1, PtrStepb img2, PtrStepf weights1, PtrStepf weights2, PtrStepb result, cudaStream_t stream);
    }
}}}

using namespace ::cv::cuda::device::blend;

void cv::cuda::blendLinear(InputArray _img1, InputArray _img2, InputArray _weights1, InputArray _weights2,
                          OutputArray _result, Stream& stream)
{
    GpuMat img1 = _img1.getGpuMat();
    GpuMat img2 = _img2.getGpuMat();

    GpuMat weights1 = _weights1.getGpuMat();
    GpuMat weights2 = _weights2.getGpuMat();

    CV_Assert( img1.size() == img2.size() );
    CV_Assert( img1.type() == img2.type() );
    CV_Assert( weights1.size() == img1.size() );
    CV_Assert( weights2.size() == img2.size() );
    CV_Assert( weights1.type() == CV_32FC1 );
    CV_Assert( weights2.type() == CV_32FC1 );

    const Size size = img1.size();
    const int depth = img1.depth();
    const int cn = img1.channels();

    _result.create(size, CV_MAKE_TYPE(depth, cn));
    GpuMat result = _result.getGpuMat();

    switch (depth)
    {
    case CV_8U:
        if (cn != 4)
            blendLinearCaller<uchar>(size.height, size.width, cn, img1, img2, weights1, weights2, result, StreamAccessor::getStream(stream));
        else
            blendLinearCaller8UC4(size.height, size.width, img1, img2, weights1, weights2, result, StreamAccessor::getStream(stream));
        break;
    case CV_32F:
        blendLinearCaller<float>(size.height, size.width, cn, img1, img2, weights1, weights2, result, StreamAccessor::getStream(stream));
        break;
    default:
        CV_Error(cv::Error::StsUnsupportedFormat, "bad image depth in linear blending function");
    }
}

#endif