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#include "precomp.hpp"

#include "opencv2/photo/cuda.hpp"
#include "opencv2/core/private.cuda.hpp"

#include "opencv2/opencv_modules.hpp"

#ifdef HAVE_OPENCV_CUDAARITHM
#  include "opencv2/cudaarithm.hpp"
#endif

#ifdef HAVE_OPENCV_CUDAIMGPROC
#  include "opencv2/cudaimgproc.hpp"
#endif

using namespace cv;
using namespace cv::cuda;

#if !defined (HAVE_CUDA) || !defined(HAVE_OPENCV_CUDAARITHM) || !defined(HAVE_OPENCV_CUDAIMGPROC)

void cv::cuda::nonLocalMeans(const GpuMat&, GpuMat&, float, int, int, int, Stream&) { throw_no_cuda(); }
void cv::cuda::FastNonLocalMeansDenoising::simpleMethod(const GpuMat&, GpuMat&, float, int, int, Stream&) { throw_no_cuda(); }
void cv::cuda::FastNonLocalMeansDenoising::labMethod( const GpuMat&, GpuMat&, float, float, int, int, Stream&) { throw_no_cuda(); }

#else

//////////////////////////////////////////////////////////////////////////////////
//// Non Local Means Denosing (brute force)

namespace cv { namespace cuda { namespace device
{
    namespace imgproc
    {
        template<typename T>
        void nlm_bruteforce_gpu(const PtrStepSzb& src, PtrStepSzb dst, int search_radius, int block_radius, float h, int borderMode, cudaStream_t stream);
    }
}}}

void cv::cuda::nonLocalMeans(const GpuMat& src, GpuMat& dst, float h, int search_window, int block_window, int borderMode, Stream& s)
{
    using cv::cuda::device::imgproc::nlm_bruteforce_gpu;
    typedef void (*func_t)(const PtrStepSzb& src, PtrStepSzb dst, int search_radius, int block_radius, float h, int borderMode, cudaStream_t stream);

    static const func_t funcs[4] = { nlm_bruteforce_gpu<uchar>, nlm_bruteforce_gpu<uchar2>, nlm_bruteforce_gpu<uchar3>, 0/*nlm_bruteforce_gpu<uchar4>,*/ };

    CV_Assert(src.type() == CV_8U || src.type() == CV_8UC2 || src.type() == CV_8UC3);

    const func_t func = funcs[src.channels() - 1];
    CV_Assert(func != 0);

    int b = borderMode;
    CV_Assert(b == BORDER_REFLECT101 || b == BORDER_REPLICATE || b == BORDER_CONSTANT || b == BORDER_REFLECT || b == BORDER_WRAP);

    dst.create(src.size(), src.type());
    func(src, dst, search_window/2, block_window/2, h, borderMode, StreamAccessor::getStream(s));
}

namespace cv { namespace cuda { namespace device
{
    namespace imgproc
    {
        void nln_fast_get_buffer_size(const PtrStepSzb& src, int search_window, int block_window, int& buffer_cols, int& buffer_rows);

        template<typename T>
        void nlm_fast_gpu(const PtrStepSzb& src, PtrStepSzb dst, PtrStepi buffer,
                          int search_window, int block_window, float h, cudaStream_t stream);

        void fnlm_split_channels(const PtrStepSz<uchar3>& lab, PtrStepb l, PtrStep<uchar2> ab, cudaStream_t stream);
        void fnlm_merge_channels(const PtrStepb& l, const PtrStep<uchar2>& ab, PtrStepSz<uchar3> lab, cudaStream_t stream);
     }
}}}

void cv::cuda::FastNonLocalMeansDenoising::simpleMethod(const GpuMat& src, GpuMat& dst, float h, int search_window, int block_window, Stream& s)
{
    CV_Assert(src.depth() == CV_8U && src.channels() < 4);

    int border_size = search_window/2 + block_window/2;
    Size esize = src.size() + Size(border_size, border_size) * 2;

    cv::cuda::ensureSizeIsEnough(esize, CV_8UC3, extended_src_buffer);
    GpuMat extended_src(esize, src.type(), extended_src_buffer.ptr(), extended_src_buffer.step);

    cv::cuda::copyMakeBorder(src, extended_src, border_size, border_size, border_size, border_size, cv::BORDER_DEFAULT, Scalar(), s);
    GpuMat src_hdr = extended_src(Rect(Point2i(border_size, border_size), src.size()));

    int bcols, brows;
    device::imgproc::nln_fast_get_buffer_size(src_hdr, search_window, block_window, bcols, brows);
    buffer.create(brows, bcols, CV_32S);

    using namespace cv::cuda::device::imgproc;
    typedef void (*nlm_fast_t)(const PtrStepSzb&, PtrStepSzb, PtrStepi, int, int, float, cudaStream_t);
    static const nlm_fast_t funcs[] = { nlm_fast_gpu<uchar>, nlm_fast_gpu<uchar2>, nlm_fast_gpu<uchar3>, 0};

    dst.create(src.size(), src.type());
    funcs[src.channels()-1](src_hdr, dst, buffer, search_window, block_window, h, StreamAccessor::getStream(s));
}

void cv::cuda::FastNonLocalMeansDenoising::labMethod( const GpuMat& src, GpuMat& dst, float h_luminance, float h_color, int search_window, int block_window, Stream& s)
{
    CV_Assert(src.type() == CV_8UC3);

    lab.create(src.size(), src.type());
    cv::cuda::cvtColor(src, lab, cv::COLOR_BGR2Lab, 0, s);

    l.create(src.size(), CV_8U);
    ab.create(src.size(), CV_8UC2);
    device::imgproc::fnlm_split_channels(lab, l, ab, StreamAccessor::getStream(s));

    simpleMethod(l, l, h_luminance, search_window, block_window, s);
    simpleMethod(ab, ab, h_color, search_window, block_window, s);

    device::imgproc::fnlm_merge_channels(l, ab, lab, StreamAccessor::getStream(s));
    cv::cuda::cvtColor(lab, dst, cv::COLOR_Lab2BGR, 0, s);
}

#endif