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#ifndef __OPENCV_GPU_DEVMEM2D_HPP__
#define __OPENCV_GPU_DEVMEM2D_HPP__

#if defined(__DEVCLASES_ADD_THRUST_BEGIN_END__)
    #include "thrust/device_ptr.h"
#endif


namespace cv
{    
    namespace gpu
    {
        // Simple lightweight structures that encapsulates information about an image on device.
        // It is intended to pass to nvcc-compiled code. GpuMat depends on headers that nvcc can't compile

#if defined(__CUDACC__) 
    #define __CV_GPU_HOST_DEVICE__ __host__ __device__ __forceinline__ 
#else
    #define __CV_GPU_HOST_DEVICE__
#endif

        template <bool expr> struct StaticAssert;
        template <> struct StaticAssert<true> {static __CV_GPU_HOST_DEVICE__ void check(){}};        
        
        template <typename T> struct DevMem2D_
        {            
            int cols;
            int rows;
            T* data;
            size_t step;
            
            DevMem2D_() : cols(0), rows(0), data(0), step(0) {}
            
            DevMem2D_(int rows_, int cols_, T *data_, size_t step_)
                : cols(cols_), rows(rows_), data(data_), step(step_) {}
            
            template <typename U>            
            explicit DevMem2D_(const DevMem2D_<U>& d)
                : cols(d.cols), rows(d.rows), data((T*)d.data), step(d.step) {}
            
            typedef T elem_type;
            enum { elem_size = sizeof(elem_type) };

            __CV_GPU_HOST_DEVICE__ size_t elemSize() const { return elem_size; }
            __CV_GPU_HOST_DEVICE__ T* ptr(int y = 0) { return (T*)( (char*)data + y * step ); }
            __CV_GPU_HOST_DEVICE__ const T* ptr(int y = 0) const { return (const T*)( (const char*)data + y * step ); }            

			__CV_GPU_HOST_DEVICE__ operator T*() const { return data; }

#if defined(__DEVCLASES_ADD_THRUST_BEGIN_END__)    
            thrust::device_ptr<T> begin() const { return thrust::device_ptr<T>(data); }
            thrust::device_ptr<T> end() const { return thrust::device_ptr<T>(data) + cols * rows; }
#endif
        };
 
        template<typename T> struct PtrStep_
        {
            T* data;
            size_t step;

            PtrStep_() : data(0), step(0) {}            
            PtrStep_(const DevMem2D_<T>& mem) : data(mem.data), step(mem.step) {}

            typedef T elem_type;
            enum { elem_size = sizeof(elem_type) };

            __CV_GPU_HOST_DEVICE__ size_t elemSize() const { return elem_size; }
            __CV_GPU_HOST_DEVICE__ T* ptr(int y = 0) { return (T*)( (char*)data + y * step); }
            __CV_GPU_HOST_DEVICE__ const T* ptr(int y = 0) const { return (const T*)( (const char*)data + y * step); }

#if defined(__DEVCLASES_ADD_THRUST_BEGIN_END__)    
            thrust::device_ptr<T> begin() const { return thrust::device_ptr<T>(data); }
#endif
        };
               
        template<typename T> struct PtrElemStep_ : public PtrStep_<T>
        {                   
            PtrElemStep_(const DevMem2D_<T>& mem) : PtrStep_<T>(mem) 
            {
                StaticAssert<256 % sizeof(T) == 0>::check();

                PtrStep_<T>::step /= PtrStep_<T>::elem_size;             
            }
            __CV_GPU_HOST_DEVICE__ T* ptr(int y = 0) { return PtrStep_<T>::data + y * PtrStep_<T>::step; }
            __CV_GPU_HOST_DEVICE__ const T* ptr(int y = 0) const { return PtrStep_<T>::data + y * PtrStep_<T>::step; }                    
        };

        typedef DevMem2D_<unsigned char> DevMem2D;
        typedef DevMem2D_<float> DevMem2Df;
        typedef DevMem2D_<int> DevMem2Di;

        typedef PtrStep_<unsigned char> PtrStep;
        typedef PtrStep_<float> PtrStepf;
        typedef PtrStep_<int> PtrStepi;

        typedef PtrElemStep_<unsigned char> PtrElemStep;
        typedef PtrElemStep_<float> PtrElemStepf;
        typedef PtrElemStep_<int> PtrElemStepi;

#undef __CV_GPU_HOST_DEVICE__
    }    
}

#endif /* __OPENCV_GPU_DEVMEM2D_HPP__ */