/*M///////////////////////////////////////////////////////////////////////////////////////
//
//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
//
//  By downloading, copying, installing or using the software you agree to this license.
//  If you do not agree to this license, do not download, install,
//  copy or use the software.
//
//
//                           License Agreement
//                For Open Source Computer Vision Library
//
// Copyright (C) 2010-2012, Multicoreware, Inc., all rights reserved.
// Copyright (C) 2010-2012, Advanced Micro Devices, Inc., all rights reserved.
// Third party copyrights are property of their respective owners.
//
// @Authors
//    Peng Xiao, pengxiao@multicorewareinc.com
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
//   * Redistribution's of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//
//   * Redistribution's in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other oclMaterials provided with the distribution.
//
//   * The name of the copyright holders may not be used to endorse or promote products
//     derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors as is and
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the Intel Corporation or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
// the use of this software, even if advised of the possibility of such damage.
//
//M*/

#include "precomp.hpp"
using namespace std;
#ifdef HAVE_CLAMDFFT
////////////////////////////////////////////////////////////////////////////
// Dft
PARAM_TEST_CASE(Dft, cv::Size, int)
{
    cv::Size dft_size;
    int	 dft_flags;
    virtual void SetUp()
    {
        dft_size  = GET_PARAM(0);
        dft_flags = GET_PARAM(1);
    }
};

TEST_P(Dft, C2C)
{
    cv::Mat a = randomMat(dft_size, CV_32FC2, 0.0, 100.0);
    cv::Mat b_gold;

    cv::ocl::oclMat d_b;

    cv::dft(a, b_gold, dft_flags);
    cv::ocl::dft(cv::ocl::oclMat(a), d_b, a.size(), dft_flags);
    EXPECT_MAT_NEAR(b_gold, cv::Mat(d_b), a.size().area() * 1e-4);
}

TEST_P(Dft, R2C)
{
    cv::Mat a = randomMat(dft_size, CV_32FC1, 0.0, 100.0);
    cv::Mat b_gold, b_gold_roi;

    cv::ocl::oclMat d_b, d_c;
    cv::ocl::dft(cv::ocl::oclMat(a), d_b, a.size(), dft_flags);
    cv::dft(a, b_gold, cv::DFT_COMPLEX_OUTPUT | dft_flags);

    b_gold_roi = b_gold(cv::Rect(0, 0, d_b.cols, d_b.rows));
    EXPECT_MAT_NEAR(b_gold_roi, cv::Mat(d_b), a.size().area() * 1e-4);

    cv::Mat c_gold;
    cv::dft(b_gold, c_gold, cv::DFT_INVERSE | cv::DFT_REAL_OUTPUT | cv::DFT_SCALE);
    EXPECT_MAT_NEAR(b_gold_roi, cv::Mat(d_b), a.size().area() * 1e-4);
}

TEST_P(Dft, R2CthenC2R)
{
    cv::Mat a = randomMat(dft_size, CV_32FC1, 0.0, 10.0);

    cv::ocl::oclMat d_b, d_c;
    cv::ocl::dft(cv::ocl::oclMat(a), d_b, a.size(), 0);
    cv::ocl::dft(d_b, d_c, a.size(), cv::DFT_SCALE | cv::DFT_INVERSE | cv::DFT_REAL_OUTPUT);
    EXPECT_MAT_NEAR(a, d_c, a.size().area() * 1e-4);
}


INSTANTIATE_TEST_CASE_P(OCL_ImgProc, Dft, testing::Combine(
                            testing::Values(cv::Size(2, 3), cv::Size(5, 4), cv::Size(25, 20), cv::Size(512, 1), cv::Size(1024, 768)),
                            testing::Values(0, (int)cv::DFT_ROWS, (int)cv::DFT_SCALE) ));

#endif // HAVE_CLAMDFFT
