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#ifndef __OPENCV_GPUWARPING_HPP__
#define __OPENCV_GPUWARPING_HPP__

#ifndef __cplusplus
#  error gpuwarping.hpp header must be compiled as C++
#endif

#include "opencv2/core/gpumat.hpp"
#include "opencv2/imgproc.hpp"

namespace cv { namespace gpu {

//! DST[x,y] = SRC[xmap[x,y],ymap[x,y]]
//! supports only CV_32FC1 map type
CV_EXPORTS void remap(const GpuMat& src, GpuMat& dst, const GpuMat& xmap, const GpuMat& ymap,
                      int interpolation, int borderMode = BORDER_CONSTANT, Scalar borderValue = Scalar(),
                      Stream& stream = Stream::Null());

//! resizes the image
//! Supports INTER_NEAREST, INTER_LINEAR, INTER_CUBIC, INTER_AREA
CV_EXPORTS void resize(const GpuMat& src, GpuMat& dst, Size dsize, double fx=0, double fy=0, int interpolation = INTER_LINEAR, Stream& stream = Stream::Null());

//! warps the image using affine transformation
//! Supports INTER_NEAREST, INTER_LINEAR, INTER_CUBIC
CV_EXPORTS void warpAffine(const GpuMat& src, GpuMat& dst, const Mat& M, Size dsize, int flags = INTER_LINEAR,
    int borderMode = BORDER_CONSTANT, Scalar borderValue = Scalar(), Stream& stream = Stream::Null());

CV_EXPORTS void buildWarpAffineMaps(const Mat& M, bool inverse, Size dsize, GpuMat& xmap, GpuMat& ymap, Stream& stream = Stream::Null());

//! warps the image using perspective transformation
//! Supports INTER_NEAREST, INTER_LINEAR, INTER_CUBIC
CV_EXPORTS void warpPerspective(const GpuMat& src, GpuMat& dst, const Mat& M, Size dsize, int flags = INTER_LINEAR,
    int borderMode = BORDER_CONSTANT, Scalar borderValue = Scalar(), Stream& stream = Stream::Null());

CV_EXPORTS void buildWarpPerspectiveMaps(const Mat& M, bool inverse, Size dsize, GpuMat& xmap, GpuMat& ymap, Stream& stream = Stream::Null());

//! builds plane warping maps
CV_EXPORTS void buildWarpPlaneMaps(Size src_size, Rect dst_roi, const Mat &K, const Mat& R, const Mat &T, float scale,
                                   GpuMat& map_x, GpuMat& map_y, Stream& stream = Stream::Null());

//! builds cylindrical warping maps
CV_EXPORTS void buildWarpCylindricalMaps(Size src_size, Rect dst_roi, const Mat &K, const Mat& R, float scale,
                                         GpuMat& map_x, GpuMat& map_y, Stream& stream = Stream::Null());

//! builds spherical warping maps
CV_EXPORTS void buildWarpSphericalMaps(Size src_size, Rect dst_roi, const Mat &K, const Mat& R, float scale,
                                       GpuMat& map_x, GpuMat& map_y, Stream& stream = Stream::Null());

//! rotates an image around the origin (0,0) and then shifts it
//! supports INTER_NEAREST, INTER_LINEAR, INTER_CUBIC
//! supports 1, 3 or 4 channels images with CV_8U, CV_16U or CV_32F depth
CV_EXPORTS void rotate(const GpuMat& src, GpuMat& dst, Size dsize, double angle, double xShift = 0, double yShift = 0,
                       int interpolation = INTER_LINEAR, Stream& stream = Stream::Null());

//! smoothes the source image and downsamples it
CV_EXPORTS void pyrDown(const GpuMat& src, GpuMat& dst, Stream& stream = Stream::Null());

//! upsamples the source image and then smoothes it
CV_EXPORTS void pyrUp(const GpuMat& src, GpuMat& dst, Stream& stream = Stream::Null());

class CV_EXPORTS ImagePyramid
{
public:
    inline ImagePyramid() : nLayers_(0) {}
    inline ImagePyramid(const GpuMat& img, int nLayers, Stream& stream = Stream::Null())
    {
        build(img, nLayers, stream);
    }

    void build(const GpuMat& img, int nLayers, Stream& stream = Stream::Null());

    void getLayer(GpuMat& outImg, Size outRoi, Stream& stream = Stream::Null()) const;

    inline void release()
    {
        layer0_.release();
        pyramid_.clear();
        nLayers_ = 0;
    }

private:
    GpuMat layer0_;
    std::vector<GpuMat> pyramid_;
    int nLayers_;
};

}} // namespace cv { namespace gpu {

#endif /* __OPENCV_GPUWARPING_HPP__ */