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#ifndef __OPENCV_STITCHING_WARPERS_HPP__
#define __OPENCV_STITCHING_WARPERS_HPP__

#include "opencv2/core.hpp"
#include "opencv2/core/cuda.hpp"
#include "opencv2/imgproc.hpp"
#include "opencv2/opencv_modules.hpp"

namespace cv {
namespace detail {

//! @addtogroup stitching_warp
//! @{

/** @brief Rotation-only model image warper interface.
 */
class CV_EXPORTS RotationWarper
{
public:
    virtual ~RotationWarper() {}

    /** @brief Projects the image point.

    @param pt Source point
    @param K Camera intrinsic parameters
    @param R Camera rotation matrix
    @return Projected point
     */
    virtual Point2f warpPoint(const Point2f &pt, InputArray K, InputArray R) = 0;

    /** @brief Builds the projection maps according to the given camera data.

    @param src_size Source image size
    @param K Camera intrinsic parameters
    @param R Camera rotation matrix
    @param xmap Projection map for the x axis
    @param ymap Projection map for the y axis
    @return Projected image minimum bounding box
     */
    virtual Rect buildMaps(Size src_size, InputArray K, InputArray R, OutputArray xmap, OutputArray ymap) = 0;

    /** @brief Projects the image.

    @param src Source image
    @param K Camera intrinsic parameters
    @param R Camera rotation matrix
    @param interp_mode Interpolation mode
    @param border_mode Border extrapolation mode
    @param dst Projected image
    @return Project image top-left corner
     */
    virtual Point warp(InputArray src, InputArray K, InputArray R, int interp_mode, int border_mode,
                       OutputArray dst) = 0;

    /** @brief Projects the image backward.

    @param src Projected image
    @param K Camera intrinsic parameters
    @param R Camera rotation matrix
    @param interp_mode Interpolation mode
    @param border_mode Border extrapolation mode
    @param dst_size Backward-projected image size
    @param dst Backward-projected image
     */
    virtual void warpBackward(InputArray src, InputArray K, InputArray R, int interp_mode, int border_mode,
                              Size dst_size, OutputArray dst) = 0;

    /**
    @param src_size Source image bounding box
    @param K Camera intrinsic parameters
    @param R Camera rotation matrix
    @return Projected image minimum bounding box
     */
    virtual Rect warpRoi(Size src_size, InputArray K, InputArray R) = 0;

    virtual float getScale() const { return 1.f; }
    virtual void setScale(float) {}
};

/** @brief Base class for warping logic implementation.
 */
struct CV_EXPORTS ProjectorBase
{
    void setCameraParams(InputArray K = Mat::eye(3, 3, CV_32F),
                         InputArray R = Mat::eye(3, 3, CV_32F),
                         InputArray T = Mat::zeros(3, 1, CV_32F));

    float scale;
    float k[9];
    float rinv[9];
    float r_kinv[9];
    float k_rinv[9];
    float t[3];
};

/** @brief Base class for rotation-based warper using a detail::ProjectorBase_ derived class.
 */
template <class P>
class CV_EXPORTS RotationWarperBase : public RotationWarper
{
public:
    Point2f warpPoint(const Point2f &pt, InputArray K, InputArray R);

    Rect buildMaps(Size src_size, InputArray K, InputArray R, OutputArray xmap, OutputArray ymap);

    Point warp(InputArray src, InputArray K, InputArray R, int interp_mode, int border_mode,
               OutputArray dst);

    void warpBackward(InputArray src, InputArray K, InputArray R, int interp_mode, int border_mode,
                      Size dst_size, OutputArray dst);

    Rect warpRoi(Size src_size, InputArray K, InputArray R);

    float getScale() const { return projector_.scale; }
    void setScale(float val) { projector_.scale = val; }

protected:

    // Detects ROI of the destination image. It's correct for any projection.
    virtual void detectResultRoi(Size src_size, Point &dst_tl, Point &dst_br);

    // Detects ROI of the destination image by walking over image border.
    // Correctness for any projection isn't guaranteed.
    void detectResultRoiByBorder(Size src_size, Point &dst_tl, Point &dst_br);

    P projector_;
};


struct CV_EXPORTS PlaneProjector : ProjectorBase
{
    void mapForward(float x, float y, float &u, float &v);
    void mapBackward(float u, float v, float &x, float &y);
};

/** @brief Warper that maps an image onto the z = 1 plane.
 */
class CV_EXPORTS PlaneWarper : public RotationWarperBase<PlaneProjector>
{
public:
    /** @brief Construct an instance of the plane warper class.

    @param scale Projected image scale multiplier
     */
    PlaneWarper(float scale = 1.f) { projector_.scale = scale; }

    Point2f warpPoint(const Point2f &pt, InputArray K, InputArray R);
    Point2f warpPoint(const Point2f &pt, InputArray K, InputArray R, InputArray T);

    virtual Rect buildMaps(Size src_size, InputArray K, InputArray R, InputArray T, OutputArray xmap, OutputArray ymap);
    Rect buildMaps(Size src_size, InputArray K, InputArray R, OutputArray xmap, OutputArray ymap);

    Point warp(InputArray src, InputArray K, InputArray R,
               int interp_mode, int border_mode, OutputArray dst);
    virtual Point warp(InputArray src, InputArray K, InputArray R, InputArray T, int interp_mode, int border_mode,
               OutputArray dst);

    Rect warpRoi(Size src_size, InputArray K, InputArray R);
    Rect warpRoi(Size src_size, InputArray K, InputArray R, InputArray T);

protected:
    void detectResultRoi(Size src_size, Point &dst_tl, Point &dst_br);
};


struct CV_EXPORTS SphericalProjector : ProjectorBase
{
    void mapForward(float x, float y, float &u, float &v);
    void mapBackward(float u, float v, float &x, float &y);
};


/** @brief Warper that maps an image onto the unit sphere located at the origin.

 Projects image onto unit sphere with origin at (0, 0, 0).
 Poles are located at (0, -1, 0) and (0, 1, 0) points.
*/
class CV_EXPORTS SphericalWarper : public RotationWarperBase<SphericalProjector>
{
public:
    /** @brief Construct an instance of the spherical warper class.

    @param scale Projected image scale multiplier
     */
    SphericalWarper(float scale) { projector_.scale = scale; }

    Rect buildMaps(Size src_size, InputArray K, InputArray R, OutputArray xmap, OutputArray ymap);
    Point warp(InputArray src, InputArray K, InputArray R, int interp_mode, int border_mode, OutputArray dst);
protected:
    void detectResultRoi(Size src_size, Point &dst_tl, Point &dst_br);
};


struct CV_EXPORTS CylindricalProjector : ProjectorBase
{
    void mapForward(float x, float y, float &u, float &v);
    void mapBackward(float u, float v, float &x, float &y);
};


/** @brief Warper that maps an image onto the x\*x + z\*z = 1 cylinder.
 */
class CV_EXPORTS CylindricalWarper : public RotationWarperBase<CylindricalProjector>
{
public:
    /** @brief Construct an instance of the cylindrical warper class.

    @param scale Projected image scale multiplier
     */
    CylindricalWarper(float scale) { projector_.scale = scale; }

    Rect buildMaps(Size src_size, InputArray K, InputArray R, OutputArray xmap, OutputArray ymap);
    Point warp(InputArray src, InputArray K, InputArray R, int interp_mode, int border_mode, OutputArray dst);
protected:
    void detectResultRoi(Size src_size, Point &dst_tl, Point &dst_br)
    {
        RotationWarperBase<CylindricalProjector>::detectResultRoiByBorder(src_size, dst_tl, dst_br);
    }
};


struct CV_EXPORTS FisheyeProjector : ProjectorBase
{
    void mapForward(float x, float y, float &u, float &v);
    void mapBackward(float u, float v, float &x, float &y);
};


class CV_EXPORTS FisheyeWarper : public RotationWarperBase<FisheyeProjector>
{
public:
    FisheyeWarper(float scale) { projector_.scale = scale; }
};


struct CV_EXPORTS StereographicProjector : ProjectorBase
{
    void mapForward(float x, float y, float &u, float &v);
    void mapBackward(float u, float v, float &x, float &y);
};


class CV_EXPORTS StereographicWarper : public RotationWarperBase<StereographicProjector>
{
public:
    StereographicWarper(float scale) { projector_.scale = scale; }
};


struct CV_EXPORTS CompressedRectilinearProjector : ProjectorBase
{
    float a, b;

    void mapForward(float x, float y, float &u, float &v);
    void mapBackward(float u, float v, float &x, float &y);
};


class CV_EXPORTS CompressedRectilinearWarper : public RotationWarperBase<CompressedRectilinearProjector>
{
public:
    CompressedRectilinearWarper(float scale, float A = 1, float B = 1)
    {
        projector_.a = A;
        projector_.b = B;
        projector_.scale = scale;
    }
};


struct CV_EXPORTS CompressedRectilinearPortraitProjector : ProjectorBase
{
    float a, b;

    void mapForward(float x, float y, float &u, float &v);
    void mapBackward(float u, float v, float &x, float &y);
};


class CV_EXPORTS CompressedRectilinearPortraitWarper : public RotationWarperBase<CompressedRectilinearPortraitProjector>
{
public:
   CompressedRectilinearPortraitWarper(float scale, float A = 1, float B = 1)
   {
       projector_.a = A;
       projector_.b = B;
       projector_.scale = scale;
   }
};


struct CV_EXPORTS PaniniProjector : ProjectorBase
{
    float a, b;

    void mapForward(float x, float y, float &u, float &v);
    void mapBackward(float u, float v, float &x, float &y);
};


class CV_EXPORTS PaniniWarper : public RotationWarperBase<PaniniProjector>
{
public:
   PaniniWarper(float scale, float A = 1, float B = 1)
   {
       projector_.a = A;
       projector_.b = B;
       projector_.scale = scale;
   }
};


struct CV_EXPORTS PaniniPortraitProjector : ProjectorBase
{
    float a, b;

    void mapForward(float x, float y, float &u, float &v);
    void mapBackward(float u, float v, float &x, float &y);
};


class CV_EXPORTS PaniniPortraitWarper : public RotationWarperBase<PaniniPortraitProjector>
{
public:
   PaniniPortraitWarper(float scale, float A = 1, float B = 1)
   {
       projector_.a = A;
       projector_.b = B;
       projector_.scale = scale;
   }

};


struct CV_EXPORTS MercatorProjector : ProjectorBase
{
    void mapForward(float x, float y, float &u, float &v);
    void mapBackward(float u, float v, float &x, float &y);
};


class CV_EXPORTS MercatorWarper : public RotationWarperBase<MercatorProjector>
{
public:
    MercatorWarper(float scale) { projector_.scale = scale; }
};


struct CV_EXPORTS TransverseMercatorProjector : ProjectorBase
{
    void mapForward(float x, float y, float &u, float &v);
    void mapBackward(float u, float v, float &x, float &y);
};


class CV_EXPORTS TransverseMercatorWarper : public RotationWarperBase<TransverseMercatorProjector>
{
public:
    TransverseMercatorWarper(float scale) { projector_.scale = scale; }
};


class CV_EXPORTS PlaneWarperGpu : public PlaneWarper
{
public:
    PlaneWarperGpu(float scale = 1.f) : PlaneWarper(scale) {}

    Rect buildMaps(Size src_size, InputArray K, InputArray R, OutputArray xmap, OutputArray ymap)
    {
        Rect result = buildMaps(src_size, K, R, d_xmap_, d_ymap_);
        d_xmap_.download(xmap);
        d_ymap_.download(ymap);
        return result;
    }

    Rect buildMaps(Size src_size, InputArray K, InputArray R, InputArray T, OutputArray xmap, OutputArray ymap)
    {
        Rect result = buildMaps(src_size, K, R, T, d_xmap_, d_ymap_);
        d_xmap_.download(xmap);
        d_ymap_.download(ymap);
        return result;
    }

    Point warp(InputArray src, InputArray K, InputArray R, int interp_mode, int border_mode,
               OutputArray dst)
    {
        d_src_.upload(src);
        Point result = warp(d_src_, K, R, interp_mode, border_mode, d_dst_);
        d_dst_.download(dst);
        return result;
    }

    Point warp(InputArray src, InputArray K, InputArray R, InputArray T, int interp_mode, int border_mode,
               OutputArray dst)
    {
        d_src_.upload(src);
        Point result = warp(d_src_, K, R, T, interp_mode, border_mode, d_dst_);
        d_dst_.download(dst);
        return result;
    }

    Rect buildMaps(Size src_size, InputArray K, InputArray R, cuda::GpuMat & xmap, cuda::GpuMat & ymap);

    Rect buildMaps(Size src_size, InputArray K, InputArray R, InputArray T, cuda::GpuMat & xmap, cuda::GpuMat & ymap);

    Point warp(const cuda::GpuMat & src, InputArray K, InputArray R, int interp_mode, int border_mode,
               cuda::GpuMat & dst);

    Point warp(const cuda::GpuMat & src, InputArray K, InputArray R, InputArray T, int interp_mode, int border_mode,
               cuda::GpuMat & dst);

private:
    cuda::GpuMat d_xmap_, d_ymap_, d_src_, d_dst_;
};


class CV_EXPORTS SphericalWarperGpu : public SphericalWarper
{
public:
    SphericalWarperGpu(float scale) : SphericalWarper(scale) {}

    Rect buildMaps(Size src_size, InputArray K, InputArray R, OutputArray xmap, OutputArray ymap)
    {
        Rect result = buildMaps(src_size, K, R, d_xmap_, d_ymap_);
        d_xmap_.download(xmap);
        d_ymap_.download(ymap);
        return result;
    }

    Point warp(InputArray src, InputArray K, InputArray R, int interp_mode, int border_mode,
               OutputArray dst)
    {
        d_src_.upload(src);
        Point result = warp(d_src_, K, R, interp_mode, border_mode, d_dst_);
        d_dst_.download(dst);
        return result;
    }

    Rect buildMaps(Size src_size, InputArray K, InputArray R, cuda::GpuMat & xmap, cuda::GpuMat & ymap);

    Point warp(const cuda::GpuMat & src, InputArray K, InputArray R, int interp_mode, int border_mode,
               cuda::GpuMat & dst);

private:
    cuda::GpuMat d_xmap_, d_ymap_, d_src_, d_dst_;
};


class CV_EXPORTS CylindricalWarperGpu : public CylindricalWarper
{
public:
    CylindricalWarperGpu(float scale) : CylindricalWarper(scale) {}

    Rect buildMaps(Size src_size, InputArray K, InputArray R, OutputArray xmap, OutputArray ymap)
    {
        Rect result = buildMaps(src_size, K, R, d_xmap_, d_ymap_);
        d_xmap_.download(xmap);
        d_ymap_.download(ymap);
        return result;
    }

    Point warp(InputArray src, InputArray K, InputArray R, int interp_mode, int border_mode,
               OutputArray dst)
    {
        d_src_.upload(src);
        Point result = warp(d_src_, K, R, interp_mode, border_mode, d_dst_);
        d_dst_.download(dst);
        return result;
    }

    Rect buildMaps(Size src_size, InputArray K, InputArray R, cuda::GpuMat & xmap, cuda::GpuMat & ymap);

    Point warp(const cuda::GpuMat & src, InputArray K, InputArray R, int interp_mode, int border_mode,
               cuda::GpuMat & dst);

private:
    cuda::GpuMat d_xmap_, d_ymap_, d_src_, d_dst_;
};


struct SphericalPortraitProjector : ProjectorBase
{
    void mapForward(float x, float y, float &u, float &v);
    void mapBackward(float u, float v, float &x, float &y);
};


// Projects image onto unit sphere with origin at (0, 0, 0).
// Poles are located NOT at (0, -1, 0) and (0, 1, 0) points, BUT at (1, 0, 0) and (-1, 0, 0) points.
class CV_EXPORTS SphericalPortraitWarper : public RotationWarperBase<SphericalPortraitProjector>
{
public:
    SphericalPortraitWarper(float scale) { projector_.scale = scale; }

protected:
    void detectResultRoi(Size src_size, Point &dst_tl, Point &dst_br);
};

struct CylindricalPortraitProjector : ProjectorBase
{
    void mapForward(float x, float y, float &u, float &v);
    void mapBackward(float u, float v, float &x, float &y);
};


class CV_EXPORTS CylindricalPortraitWarper : public RotationWarperBase<CylindricalPortraitProjector>
{
public:
    CylindricalPortraitWarper(float scale) { projector_.scale = scale; }

protected:
    void detectResultRoi(Size src_size, Point &dst_tl, Point &dst_br)
    {
        RotationWarperBase<CylindricalPortraitProjector>::detectResultRoiByBorder(src_size, dst_tl, dst_br);
    }
};

struct PlanePortraitProjector : ProjectorBase
{
    void mapForward(float x, float y, float &u, float &v);
    void mapBackward(float u, float v, float &x, float &y);
};


class CV_EXPORTS PlanePortraitWarper : public RotationWarperBase<PlanePortraitProjector>
{
public:
    PlanePortraitWarper(float scale) { projector_.scale = scale; }

protected:
    void detectResultRoi(Size src_size, Point &dst_tl, Point &dst_br)
    {
        RotationWarperBase<PlanePortraitProjector>::detectResultRoiByBorder(src_size, dst_tl, dst_br);
    }
};

//! @} stitching_warp

} // namespace detail
} // namespace cv

#include "warpers_inl.hpp"

#endif // __OPENCV_STITCHING_WARPERS_HPP__