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//                           License Agreement
//                For Open Source Computer Vision Library
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// Redistribution and use in source and binary forms, with or without modification,
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#include "precomp.hpp"

#if !defined (HAVE_CUDA)

void cv::gpu::graphcut(GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, Stream&) { throw_nogpu(); }
void cv::gpu::graphcut(GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, Stream&) { throw_nogpu(); }

#else /* !defined (HAVE_CUDA) */

namespace
{
    typedef NppStatus (*init_func_t)(NppiSize oSize, NppiGraphcutState** ppState, Npp8u* pDeviceMem);

    class NppiGraphcutStateHandler
    {
    public:
        NppiGraphcutStateHandler(NppiSize sznpp, Npp8u* pDeviceMem, const init_func_t func)
        {
            nppSafeCall( func(sznpp, &pState, pDeviceMem) );
        }

        ~NppiGraphcutStateHandler()
        {
            nppSafeCall( nppiGraphcutFree(pState) );
        }

        operator NppiGraphcutState*()
        {
            return pState;
        }

    private:        
        NppiGraphcutState* pState;
    };
}

void cv::gpu::graphcut(GpuMat& terminals, GpuMat& leftTransp, GpuMat& rightTransp, GpuMat& top, GpuMat& bottom, GpuMat& labels, GpuMat& buf, Stream& s)
{
    Size src_size = terminals.size();

    CV_Assert(terminals.type() == CV_32S);
    CV_Assert(leftTransp.size() == Size(src_size.height, src_size.width));
    CV_Assert(leftTransp.type() == CV_32S);
    CV_Assert(rightTransp.size() == Size(src_size.height, src_size.width));
    CV_Assert(rightTransp.type() == CV_32S);
    CV_Assert(top.size() == src_size);
    CV_Assert(top.type() == CV_32S);
    CV_Assert(bottom.size() == src_size);
    CV_Assert(bottom.type() == CV_32S);

    labels.create(src_size, CV_8U);

    NppiSize sznpp;
    sznpp.width = src_size.width;
    sznpp.height = src_size.height;

    int bufsz;
    nppSafeCall( nppiGraphcutGetSize(sznpp, &bufsz) );

    ensureSizeIsEnough(1, bufsz, CV_8U, buf);

    cudaStream_t stream = StreamAccessor::getStream(s);

    NppStreamHandler h(stream);

    NppiGraphcutStateHandler state(sznpp, buf.ptr<Npp8u>(), nppiGraphcutInitAlloc);
    
    nppSafeCall( nppiGraphcut_32s8u(terminals.ptr<Npp32s>(), leftTransp.ptr<Npp32s>(), rightTransp.ptr<Npp32s>(), top.ptr<Npp32s>(), bottom.ptr<Npp32s>(),
        static_cast<int>(terminals.step), static_cast<int>(leftTransp.step), sznpp, labels.ptr<Npp8u>(), static_cast<int>(labels.step), state) );

    if (stream == 0)
        cudaSafeCall( cudaDeviceSynchronize() );
}

void cv::gpu::graphcut(GpuMat& terminals, GpuMat& leftTransp, GpuMat& rightTransp, GpuMat& top, GpuMat& topLeft, GpuMat& topRight, 
              GpuMat& bottom, GpuMat& bottomLeft, GpuMat& bottomRight, GpuMat& labels, GpuMat& buf, Stream& s)
{
    Size src_size = terminals.size();

    CV_Assert(terminals.type() == CV_32S);

    CV_Assert(leftTransp.size() == Size(src_size.height, src_size.width));
    CV_Assert(leftTransp.type() == CV_32S);

    CV_Assert(rightTransp.size() == Size(src_size.height, src_size.width));
    CV_Assert(rightTransp.type() == CV_32S);

    CV_Assert(top.size() == src_size);
    CV_Assert(top.type() == CV_32S);

    CV_Assert(topLeft.size() == src_size);
    CV_Assert(topLeft.type() == CV_32S);

    CV_Assert(topRight.size() == src_size);
    CV_Assert(topRight.type() == CV_32S);

    CV_Assert(bottom.size() == src_size);
    CV_Assert(bottom.type() == CV_32S);

    CV_Assert(bottomLeft.size() == src_size);
    CV_Assert(bottomLeft.type() == CV_32S);

    CV_Assert(bottomRight.size() == src_size);
    CV_Assert(bottomRight.type() == CV_32S);

    labels.create(src_size, CV_8U);

    NppiSize sznpp;
    sznpp.width = src_size.width;
    sznpp.height = src_size.height;

    int bufsz;
    nppSafeCall( nppiGraphcut8GetSize(sznpp, &bufsz) );

    ensureSizeIsEnough(1, bufsz, CV_8U, buf);

    cudaStream_t stream = StreamAccessor::getStream(s);

    NppStreamHandler h(stream);

    NppiGraphcutStateHandler state(sznpp, buf.ptr<Npp8u>(), nppiGraphcut8InitAlloc);
    
    nppSafeCall( nppiGraphcut8_32s8u(terminals.ptr<Npp32s>(), leftTransp.ptr<Npp32s>(), rightTransp.ptr<Npp32s>(), 
        top.ptr<Npp32s>(), topLeft.ptr<Npp32s>(), topRight.ptr<Npp32s>(),
        bottom.ptr<Npp32s>(), bottomLeft.ptr<Npp32s>(), bottomRight.ptr<Npp32s>(),
        static_cast<int>(terminals.step), static_cast<int>(leftTransp.step), sznpp, labels.ptr<Npp8u>(), static_cast<int>(labels.step), state) );

    if (stream == 0)
        cudaSafeCall( cudaDeviceSynchronize() );
}

#endif /* !defined (HAVE_CUDA) */