// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
//
// Copyright (C) 2018-2019 Intel Corporation


#include "precomp.hpp"

#include "opencv2/gapi/imgproc.hpp"
#include "opencv2/gapi/gpu/imgproc.hpp"
#include "backends/gpu/ggpuimgproc.hpp"


GAPI_GPU_KERNEL(GGPUSepFilter, cv::gapi::imgproc::GSepFilter)
{
    static void run(const cv::UMat& in, int ddepth, const cv::Mat& kernX, const cv::Mat& kernY, const cv::Point& anchor, const cv::Scalar& delta,
                    int border, const cv::Scalar& bordVal, cv::UMat &out)
    {
        if( border == cv::BORDER_CONSTANT )
        {
            cv::UMat temp_in;
            int width_add = (kernY.cols - 1) / 2;
            int height_add =  (kernX.rows - 1) / 2;
            cv::copyMakeBorder(in, temp_in, height_add, height_add, width_add, width_add, border, bordVal);
            cv::Rect rect = cv::Rect(height_add, width_add, in.cols, in.rows);
            cv::sepFilter2D(temp_in(rect), out, ddepth, kernX, kernY, anchor, delta.val[0], border);
        }
        else
            cv::sepFilter2D(in, out, ddepth, kernX, kernY, anchor, delta.val[0], border);
    }
};

GAPI_GPU_KERNEL(GGPUBoxFilter, cv::gapi::imgproc::GBoxFilter)
{
    static void run(const cv::UMat& in, int ddepth, const cv::Size& ksize, const cv::Point& anchor, bool normalize, int borderType, const cv::Scalar& bordVal, cv::UMat &out)
    {
        if( borderType == cv::BORDER_CONSTANT )
        {
            cv::UMat temp_in;
            int width_add = (ksize.width - 1) / 2;
            int height_add =  (ksize.height - 1) / 2;
            cv::copyMakeBorder(in, temp_in, height_add, height_add, width_add, width_add, borderType, bordVal);
            cv::Rect rect = cv::Rect(height_add, width_add, in.cols, in.rows);
            cv::boxFilter(temp_in(rect), out, ddepth, ksize, anchor, normalize, borderType);
        }
        else
            cv::boxFilter(in, out, ddepth, ksize, anchor, normalize, borderType);
    }
};

GAPI_GPU_KERNEL(GGPUBlur, cv::gapi::imgproc::GBlur)
{
    static void run(const cv::UMat& in, const cv::Size& ksize, const cv::Point& anchor, int borderType, const cv::Scalar& bordVal, cv::UMat &out)
    {
        if( borderType == cv::BORDER_CONSTANT )
        {
            cv::UMat temp_in;
            int width_add = (ksize.width - 1) / 2;
            int height_add =  (ksize.height - 1) / 2;
            cv::copyMakeBorder(in, temp_in, height_add, height_add, width_add, width_add, borderType, bordVal);
            cv::Rect rect = cv::Rect(height_add, width_add, in.cols, in.rows);
            cv::blur(temp_in(rect), out, ksize, anchor, borderType);
        }
        else
            cv::blur(in, out, ksize, anchor, borderType);
    }
};


GAPI_GPU_KERNEL(GGPUFilter2D, cv::gapi::imgproc::GFilter2D)
{
    static void run(const cv::UMat& in, int ddepth, const cv::Mat& k, const cv::Point& anchor, const cv::Scalar& delta, int border,
                    const cv::Scalar& bordVal, cv::UMat &out)
    {
        if( border == cv::BORDER_CONSTANT )
        {
            cv::UMat temp_in;
            int width_add = (k.cols - 1) / 2;
            int height_add =  (k.rows - 1) / 2;
            cv::copyMakeBorder(in, temp_in, height_add, height_add, width_add, width_add, border, bordVal );
            cv::Rect rect = cv::Rect(height_add, width_add, in.cols, in.rows);
            cv::filter2D(temp_in(rect), out, ddepth, k, anchor, delta.val[0], border);
        }
        else
            cv::filter2D(in, out, ddepth, k, anchor, delta.val[0], border);
    }
};

GAPI_GPU_KERNEL(GGPUGaussBlur, cv::gapi::imgproc::GGaussBlur)
{
    static void run(const cv::UMat& in, const cv::Size& ksize, double sigmaX, double sigmaY, int borderType, const cv::Scalar& bordVal, cv::UMat &out)
    {
        if( borderType == cv::BORDER_CONSTANT )
        {
            cv::UMat temp_in;
            int width_add = (ksize.width - 1) / 2;
            int height_add =  (ksize.height - 1) / 2;
            cv::copyMakeBorder(in, temp_in, height_add, height_add, width_add, width_add, borderType, bordVal );
            cv::Rect rect = cv::Rect(height_add, width_add, in.cols, in.rows);
            cv::GaussianBlur(temp_in(rect), out, ksize, sigmaX, sigmaY, borderType);
        }
        else
            cv::GaussianBlur(in, out, ksize, sigmaX, sigmaY, borderType);
    }
};

GAPI_GPU_KERNEL(GGPUMedianBlur, cv::gapi::imgproc::GMedianBlur)
{
    static void run(const cv::UMat& in, int ksize, cv::UMat &out)
    {
        cv::medianBlur(in, out, ksize);
    }
};

GAPI_GPU_KERNEL(GGPUErode, cv::gapi::imgproc::GErode)
{
    static void run(const cv::UMat& in, const cv::Mat& kernel, const cv::Point& anchor, int iterations, int borderType, const cv::Scalar& borderValue, cv::UMat &out)
    {
        cv::erode(in, out, kernel, anchor, iterations, borderType, borderValue);
    }
};

GAPI_GPU_KERNEL(GGPUDilate, cv::gapi::imgproc::GDilate)
{
    static void run(const cv::UMat& in, const cv::Mat& kernel, const cv::Point& anchor, int iterations, int borderType, const cv::Scalar& borderValue, cv::UMat &out)
    {
        cv::dilate(in, out, kernel, anchor, iterations, borderType, borderValue);
    }
};

GAPI_GPU_KERNEL(GGPUSobel, cv::gapi::imgproc::GSobel)
{
    static void run(const cv::UMat& in, int ddepth, int dx, int dy, int ksize, double scale, double delta, int borderType,
                    const cv::Scalar& bordVal, cv::UMat &out)
    {
        if( borderType == cv::BORDER_CONSTANT )
        {
            cv::UMat temp_in;
            int add = (ksize - 1) / 2;
            cv::copyMakeBorder(in, temp_in, add, add, add, add, borderType, bordVal );
            cv::Rect rect = cv::Rect(add, add, in.cols, in.rows);
            cv::Sobel(temp_in(rect), out, ddepth, dx, dy, ksize, scale, delta, borderType);
        }
        else
        cv::Sobel(in, out, ddepth, dx, dy, ksize, scale, delta, borderType);
    }
};

GAPI_GPU_KERNEL(GGPUEqualizeHist, cv::gapi::imgproc::GEqHist)
{
    static void run(const cv::UMat& in, cv::UMat &out)
    {
        cv::equalizeHist(in, out);
    }
};

GAPI_GPU_KERNEL(GGPUCanny, cv::gapi::imgproc::GCanny)
{
    static void run(const cv::UMat& in, double thr1, double thr2, int apSize, bool l2gradient, cv::UMat &out)
    {
        cv::Canny(in, out, thr1, thr2, apSize, l2gradient);
    }
};

GAPI_GPU_KERNEL(GGPURGB2YUV, cv::gapi::imgproc::GRGB2YUV)
{
    static void run(const cv::UMat& in, cv::UMat &out)
    {
        cv::cvtColor(in, out, cv::COLOR_RGB2YUV);
    }
};

GAPI_GPU_KERNEL(GGPUYUV2RGB, cv::gapi::imgproc::GYUV2RGB)
{
    static void run(const cv::UMat& in, cv::UMat &out)
    {
        cv::cvtColor(in, out, cv::COLOR_YUV2RGB);
    }
};

GAPI_GPU_KERNEL(GGPURGB2Lab, cv::gapi::imgproc::GRGB2Lab)
{
    static void run(const cv::UMat& in, cv::UMat &out)
    {
        cv::cvtColor(in, out, cv::COLOR_RGB2Lab);
    }
};

GAPI_GPU_KERNEL(GGPUBGR2LUV, cv::gapi::imgproc::GBGR2LUV)
{
    static void run(const cv::UMat& in, cv::UMat &out)
    {
        cv::cvtColor(in, out, cv::COLOR_BGR2Luv);
    }
};

GAPI_GPU_KERNEL(GGPUBGR2YUV, cv::gapi::imgproc::GBGR2YUV)
{
    static void run(const cv::UMat& in, cv::UMat &out)
    {
        cv::cvtColor(in, out, cv::COLOR_BGR2YUV);
    }
};

GAPI_GPU_KERNEL(GGPULUV2BGR, cv::gapi::imgproc::GLUV2BGR)
{
    static void run(const cv::UMat& in, cv::UMat &out)
    {
        cv::cvtColor(in, out, cv::COLOR_Luv2BGR);
    }
};

GAPI_GPU_KERNEL(GGPUYUV2BGR, cv::gapi::imgproc::GYUV2BGR)
{
    static void run(const cv::UMat& in, cv::UMat &out)
    {
        cv::cvtColor(in, out, cv::COLOR_YUV2BGR);
    }
};

GAPI_GPU_KERNEL(GGPURGB2Gray, cv::gapi::imgproc::GRGB2Gray)
{
    static void run(const cv::UMat& in, cv::UMat &out)
    {
        cv::cvtColor(in, out, cv::COLOR_RGB2GRAY);
    }
};

GAPI_GPU_KERNEL(GGPUBGR2Gray, cv::gapi::imgproc::GBGR2Gray)
{
    static void run(const cv::UMat& in, cv::UMat &out)
    {
        cv::cvtColor(in, out, cv::COLOR_BGR2GRAY);
    }
};

GAPI_GPU_KERNEL(GGPURGB2GrayCustom, cv::gapi::imgproc::GRGB2GrayCustom)
{
    //TODO: avoid copy
    static void run(const cv::UMat& in, float rY, float bY, float gY, cv::UMat &out)
    {
        cv::Mat planes[3];
        cv::split(in.getMat(cv::ACCESS_READ), planes);
        cv::Mat tmp_out = (planes[0]*rY + planes[1]*bY + planes[2]*gY);
        tmp_out.copyTo(out);
    }
};


cv::gapi::GKernelPackage cv::gapi::imgproc::gpu::kernels()
{
    static auto pkg = cv::gapi::kernels
        < GGPUFilter2D
        , GGPUSepFilter
        , GGPUBoxFilter
        , GGPUBlur
        , GGPUGaussBlur
        , GGPUMedianBlur
        , GGPUErode
        , GGPUDilate
        , GGPUSobel
        , GGPUCanny
        , GGPUEqualizeHist
        , GGPURGB2YUV
        , GGPUYUV2RGB
        , GGPURGB2Lab
        , GGPUBGR2LUV
        , GGPUBGR2YUV
        , GGPUYUV2BGR
        , GGPULUV2BGR
        , GGPUBGR2Gray
        , GGPURGB2Gray
        , GGPURGB2GrayCustom
        >();
    return pkg;
}
