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#include "precomp.hpp"

#ifndef HAVE_CUDA

void cv::gpu::remap(const GpuMat&, GpuMat&, const GpuMat&, const GpuMat&, int, int, Scalar, Stream&){ throw_nogpu(); }

#else // HAVE_CUDA

namespace cv { namespace gpu { namespace device 
{
    namespace imgproc 
    {
        template <typename T> 
        void remap_gpu(DevMem2Db src, DevMem2Db srcWhole, int xoff, int yoff, DevMem2Df xmap, DevMem2Df ymap, DevMem2Db dst, 
                       int interpolation, int borderMode, const float* borderValue, cudaStream_t stream, int cc);
    }
}}}

void cv::gpu::remap(const GpuMat& src, GpuMat& dst, const GpuMat& xmap, const GpuMat& ymap, int interpolation, int borderMode, Scalar borderValue, Stream& stream)
{
    using namespace cv::gpu::device::imgproc;

    typedef void (*func_t)(DevMem2Db src, DevMem2Db srcWhole, int xoff, int yoff, DevMem2Df xmap, DevMem2Df ymap, DevMem2Db dst, int interpolation, 
        int borderMode, const float* borderValue, cudaStream_t stream, int cc);

    static const func_t funcs[6][4] = 
    {
        {remap_gpu<uchar>      , 0 /*remap_gpu<uchar2>*/ , remap_gpu<uchar3>     , remap_gpu<uchar4>     },
        {0 /*remap_gpu<schar>*/, 0 /*remap_gpu<char2>*/  , 0 /*remap_gpu<char3>*/, 0 /*remap_gpu<char4>*/},
        {remap_gpu<ushort>     , 0 /*remap_gpu<ushort2>*/, remap_gpu<ushort3>    , remap_gpu<ushort4>    },
        {remap_gpu<short>      , 0 /*remap_gpu<short2>*/ , remap_gpu<short3>     , remap_gpu<short4>     },
        {0 /*remap_gpu<int>*/  , 0 /*remap_gpu<int2>*/   , 0 /*remap_gpu<int3>*/ , 0 /*remap_gpu<int4>*/ },
        {remap_gpu<float>      , 0 /*remap_gpu<float2>*/ , remap_gpu<float3>     , remap_gpu<float4>     }
    };

    CV_Assert(src.depth() <= CV_32F && src.channels() <= 4);
    CV_Assert(xmap.type() == CV_32F && ymap.type() == CV_32F && xmap.size() == ymap.size());
    CV_Assert(interpolation == INTER_NEAREST || interpolation == INTER_LINEAR || interpolation == INTER_CUBIC);
    CV_Assert(borderMode == BORDER_REFLECT101 || borderMode == BORDER_REPLICATE || borderMode == BORDER_CONSTANT || borderMode == BORDER_REFLECT || borderMode == BORDER_WRAP);

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

    int gpuBorderType;
    CV_Assert(tryConvertToGpuBorderType(borderMode, gpuBorderType));

    dst.create(xmap.size(), src.type());

    Scalar_<float> borderValueFloat;
    borderValueFloat = borderValue;

    DeviceInfo info;
    int cc = info.majorVersion() * 10 + info.minorVersion();

    Size wholeSize;
    Point ofs;
    src.locateROI(wholeSize, ofs);

    func(src, DevMem2Db(wholeSize.height, wholeSize.width, src.datastart, src.step), ofs.x, ofs.y, xmap, ymap, 
        dst, interpolation, gpuBorderType, borderValueFloat.val, StreamAccessor::getStream(stream), cc);
}

#endif // HAVE_CUDA
