/*M///////////////////////////////////////////////////////////////////////////////////////
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//
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//                           License Agreement
//                For Open Source Computer Vision Library
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// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
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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&) { throw_nogpu(); }

#else /* !defined (HAVE_CUDA) */

void cv::gpu::graphcut(GpuMat& terminals, GpuMat& leftTransp, GpuMat& rightTransp, GpuMat& top, GpuMat& bottom, GpuMat& labels, GpuMat& buf)
{
    CV_Assert(leftTransp.type() == CV_32S && rightTransp.type() == CV_32S);
    CV_Assert(terminals.type() == CV_32S && bottom.type() == CV_32S && top.type() == CV_32S);
    CV_Assert(terminals.size() == leftTransp.size());
    CV_Assert(terminals.size() == rightTransp.size());
    CV_Assert(terminals.size() == top.size() && terminals.size() == bottom.size());
    CV_Assert(top.step == bottom.step && top.step == terminals.step && rightTransp.step == leftTransp.step);

    labels.create(terminals.size(), CV_8U);

    NppiSize sznpp;
    sznpp.width = terminals.cols;
    sznpp.height = terminals.rows;

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

    if ((size_t)bufsz > buf.cols * buf.rows * buf.elemSize())
        buf.create(1, bufsz, CV_8U);

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

    cudaSafeCall( cudaThreadSynchronize() );
}


#endif /* !defined (HAVE_CUDA) */