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// @Authors
//    Fangfang Bai, fangfang@multicorewareinc.com
//    Jin Ma,       jin@multicorewareinc.com
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#include "perf_precomp.hpp"

using namespace perf;
using namespace cv;
using std::tr1::get;

///////////// blend ////////////////////////

template <typename T>
static void blendLinearGold(const Mat &img1, const Mat &img2,
                            const Mat &weights1, const Mat &weights2,
                            Mat &result_gold)
{
    CV_Assert(img1.size() == img2.size() && img1.type() == img2.type());
    CV_Assert(weights1.size() == weights2.size() && weights1.size() == img1.size() &&
              weights1.type() == CV_32FC1 && weights2.type() == CV_32FC1);

    result_gold.create(img1.size(), img1.type());

    int cn = img1.channels();
    int step1 = img1.cols * img1.channels();

    for (int y = 0; y < img1.rows; ++y)
    {
        const float * const weights1_row = weights1.ptr<float>(y);
        const float * const weights2_row = weights2.ptr<float>(y);
        const T * const img1_row = img1.ptr<T>(y);
        const T * const img2_row = img2.ptr<T>(y);
        T * const result_gold_row = result_gold.ptr<T>(y);

        for (int x = 0; x < step1; ++x)
        {
            int x1 = x / cn;
            float w1 = weights1_row[x1], w2 = weights2_row[x1];
            result_gold_row[x] = saturate_cast<T>(((float)img1_row[x] * w1
                                                 + (float)img2_row[x] * w2) / (w1 + w2 + 1e-5f));
        }
    }
}

typedef void (*blendFunction)(const Mat &img1, const Mat &img2,
                              const Mat &weights1, const Mat &weights2,
                              Mat &result_gold);

typedef Size_MatType blendLinearFixture;

PERF_TEST_P(blendLinearFixture, blendLinear, ::testing::Combine(
                OCL_TYPICAL_MAT_SIZES, testing::Values(CV_8UC1, CV_8UC3, CV_32FC1)))
{
    Size_MatType_t params = GetParam();
    const Size srcSize = get<0>(params);
    const int srcType = get<1>(params);
    const double eps = CV_MAT_DEPTH(srcType) <= CV_32S ? 1.0 : 0.2;

    Mat src1(srcSize, srcType), src2(srcSize, srcType), dst(srcSize, srcType);
    Mat weights1(srcSize, CV_32FC1), weights2(srcSize, CV_32FC1);

    declare.in(src1, src2, WARMUP_RNG).out(dst);
    randu(weights1, 0.0f, 1.0f);
    randu(weights2, 0.0f, 1.0f);

    if (RUN_OCL_IMPL)
    {
        ocl::oclMat oclSrc1(src1), oclSrc2(src2), oclDst;
        ocl::oclMat oclWeights1(weights1), oclWeights2(weights2);

        OCL_TEST_CYCLE() ocl::blendLinear(oclSrc1, oclSrc2, oclWeights1, oclWeights2, oclDst);

        oclDst.download(dst);

        SANITY_CHECK(dst, eps);
    }
    else if (RUN_PLAIN_IMPL)
    {
        blendFunction funcs[] = { (blendFunction)blendLinearGold<uchar>, (blendFunction)blendLinearGold<float> };
        int funcIdx = CV_MAT_DEPTH(srcType) == CV_8UC1 ? 0 : 1;

        TEST_CYCLE() (funcs[funcIdx])(src1, src2, weights1, weights2, dst);

        SANITY_CHECK(dst, eps);
    }
    else
        OCL_PERF_ELSE
}