711/BuguLive/TiLiveSDK_Standard2040120512/opencv2.framework/Versions/A/Headers/hal/defs.h

/*M///////////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
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// Redistribution and use in source and binary forms, with or without modification,
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//   * Redistribution's of source code must retain the above copyright notice,
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//M*/

#ifndef __OPENCV_DEF_H__
#define __OPENCV_DEF_H__

#if !defined _CRT_SECURE_NO_DEPRECATE && defined _MSC_VER && _MSC_VER > 1300
#  define _CRT_SECURE_NO_DEPRECATE /* to avoid multiple Visual Studio warnings */
#endif

#include <limits.h>

#if defined __ICL
#  define CV_ICC   __ICL
#elif defined __ICC
#  define CV_ICC   __ICC
#elif defined __ECL
#  define CV_ICC   __ECL
#elif defined __ECC
#  define CV_ICC   __ECC
#elif defined __INTEL_COMPILER
#  define CV_ICC   __INTEL_COMPILER
#endif

#ifndef CV_INLINE
#  if defined __cplusplus
#    define CV_INLINE static inline
#  elif defined _MSC_VER
#    define CV_INLINE __inline
#  else
#    define CV_INLINE static
#  endif
#endif

#if defined CV_ICC && !defined CV_ENABLE_UNROLLED
#  define CV_ENABLE_UNROLLED 0
#else
#  define CV_ENABLE_UNROLLED 1
#endif

#ifdef __GNUC__
#  define CV_DECL_ALIGNED(x) __attribute__ ((aligned (x)))
#elif defined _MSC_VER
#  define CV_DECL_ALIGNED(x) __declspec(align(x))
#else
#  define CV_DECL_ALIGNED(x)
#endif

/* CPU features and intrinsics support */
#define CV_CPU_NONE             0
#define CV_CPU_MMX              1
#define CV_CPU_SSE              2
#define CV_CPU_SSE2             3
#define CV_CPU_SSE3             4
#define CV_CPU_SSSE3            5
#define CV_CPU_SSE4_1           6
#define CV_CPU_SSE4_2           7
#define CV_CPU_POPCNT           8

#define CV_CPU_AVX              10
#define CV_CPU_AVX2             11
#define CV_CPU_FMA3             12

#define CV_CPU_AVX_512F         13
#define CV_CPU_AVX_512BW        14
#define CV_CPU_AVX_512CD        15
#define CV_CPU_AVX_512DQ        16
#define CV_CPU_AVX_512ER        17
#define CV_CPU_AVX_512IFMA512   18
#define CV_CPU_AVX_512PF        19
#define CV_CPU_AVX_512VBMI      20
#define CV_CPU_AVX_512VL        21

#define CV_CPU_NEON   100

// when adding to this list remember to update the enum in core/utility.cpp
#define CV_HARDWARE_MAX_FEATURE 255

// do not include SSE/AVX/NEON headers for NVCC compiler
#ifndef __CUDACC__

#if defined __SSE2__ || defined _M_X64 || (defined _M_IX86_FP && _M_IX86_FP >= 2)
#  include <emmintrin.h>
#  define CV_MMX 1
#  define CV_SSE 1
#  define CV_SSE2 1
#  if defined __SSE3__ || (defined _MSC_VER && _MSC_VER >= 1500)
#    include <pmmintrin.h>
#    define CV_SSE3 1
#  endif
#  if defined __SSSE3__  || (defined _MSC_VER && _MSC_VER >= 1500)
#    include <tmmintrin.h>
#    define CV_SSSE3 1
#  endif
#  if defined __SSE4_1__ || (defined _MSC_VER && _MSC_VER >= 1500)
#    include <smmintrin.h>
#    define CV_SSE4_1 1
#  endif
#  if defined __SSE4_2__ || (defined _MSC_VER && _MSC_VER >= 1500)
#    include <nmmintrin.h>
#    define CV_SSE4_2 1
#  endif
#  if defined __POPCNT__ || (defined _MSC_VER && _MSC_VER >= 1500)
#    ifdef _MSC_VER
#      include <nmmintrin.h>
#    else
#      include <popcntintrin.h>
#    endif
#    define CV_POPCNT 1
#  endif
#  if defined __AVX__ || (defined _MSC_VER && _MSC_VER >= 1600 && 0)
// MS Visual Studio 2010 (2012?) has no macro pre-defined to identify the use of /arch:AVX
// See: http://connect.microsoft.com/VisualStudio/feedback/details/605858/arch-avx-should-define-a-predefined-macro-in-x64-and-set-a-unique-value-for-m-ix86-fp-in-win32
#    include <immintrin.h>
#    define CV_AVX 1
#    if defined(_XCR_XFEATURE_ENABLED_MASK)
#      define __xgetbv() _xgetbv(_XCR_XFEATURE_ENABLED_MASK)
#    else
#      define __xgetbv() 0
#    endif
#  endif
#  if defined __AVX2__ || (defined _MSC_VER && _MSC_VER >= 1800 && 0)
#    include <immintrin.h>
#    define CV_AVX2 1
#    if defined __FMA__
#      define CV_FMA3 1
#    endif
#  endif
#endif

#if (defined WIN32 || defined _WIN32) && defined(_M_ARM)
# include <Intrin.h>
# include "arm_neon.h"
# define CV_NEON 1
# define CPU_HAS_NEON_FEATURE (true)
#elif defined(__ARM_NEON__) || (defined (__ARM_NEON) && defined(__aarch64__))
#  include <arm_neon.h>
#  define CV_NEON 1
#endif

#if defined __GNUC__ && defined __arm__ && (defined __ARM_PCS_VFP || defined __ARM_VFPV3__)
#  define CV_VFP 1
#endif

#endif // __CUDACC__

#ifndef CV_POPCNT
#define CV_POPCNT 0
#endif
#ifndef CV_MMX
#  define CV_MMX 0
#endif
#ifndef CV_SSE
#  define CV_SSE 0
#endif
#ifndef CV_SSE2
#  define CV_SSE2 0
#endif
#ifndef CV_SSE3
#  define CV_SSE3 0
#endif
#ifndef CV_SSSE3
#  define CV_SSSE3 0
#endif
#ifndef CV_SSE4_1
#  define CV_SSE4_1 0
#endif
#ifndef CV_SSE4_2
#  define CV_SSE4_2 0
#endif
#ifndef CV_AVX
#  define CV_AVX 0
#endif
#ifndef CV_AVX2
#  define CV_AVX2 0
#endif
#ifndef CV_FMA3
#  define CV_FMA3 0
#endif
#ifndef CV_AVX_512F
#  define CV_AVX_512F 0
#endif
#ifndef CV_AVX_512BW
#  define CV_AVX_512BW 0
#endif
#ifndef CV_AVX_512CD
#  define CV_AVX_512CD 0
#endif
#ifndef CV_AVX_512DQ
#  define CV_AVX_512DQ 0
#endif
#ifndef CV_AVX_512ER
#  define CV_AVX_512ER 0
#endif
#ifndef CV_AVX_512IFMA512
#  define CV_AVX_512IFMA512 0
#endif
#ifndef CV_AVX_512PF
#  define CV_AVX_512PF 0
#endif
#ifndef CV_AVX_512VBMI
#  define CV_AVX_512VBMI 0
#endif
#ifndef CV_AVX_512VL
#  define CV_AVX_512VL 0
#endif

#ifndef CV_NEON
#  define CV_NEON 0
#endif

#ifndef CV_VFP
#  define CV_VFP 0
#endif

/* primitive types */
/*
  schar  - signed 1 byte integer
  uchar  - unsigned 1 byte integer
  short  - signed 2 byte integer
  ushort - unsigned 2 byte integer
  int    - signed 4 byte integer
  uint   - unsigned 4 byte integer
  int64  - signed 8 byte integer
  uint64 - unsigned 8 byte integer
*/

#if !defined _MSC_VER && !defined __BORLANDC__
#  if defined __cplusplus && __cplusplus >= 201103L
#    include <cstdint>
     typedef std::uint32_t uint;
#  else
#    include <stdint.h>
     typedef uint32_t uint;
#  endif
#else
   typedef unsigned uint;
#endif

typedef signed char schar;

#ifndef __IPL_H__
   typedef unsigned char uchar;
   typedef unsigned short ushort;
#endif

#if defined _MSC_VER || defined __BORLANDC__
   typedef __int64 int64;
   typedef unsigned __int64 uint64;
#  define CV_BIG_INT(n)   n##I64
#  define CV_BIG_UINT(n)  n##UI64
#else
   typedef int64_t int64;
   typedef uint64_t uint64;
#  define CV_BIG_INT(n)   n##LL
#  define CV_BIG_UINT(n)  n##ULL
#endif

/* fundamental constants */
#define CV_PI   3.1415926535897932384626433832795
#define CV_2PI 6.283185307179586476925286766559
#define CV_LOG2 0.69314718055994530941723212145818

typedef union Cv32suf
{
    int i;
    unsigned u;
    float f;
}
Cv32suf;

typedef union Cv64suf
{
    int64 i;
    uint64 u;
    double f;
}
Cv64suf;


/****************************************************************************************\
*                                      fast math                                         *
\****************************************************************************************/

#if defined __BORLANDC__
#  include <fastmath.h>
#elif defined __cplusplus
#  include <cmath>
#else
#  include <math.h>
#endif

#ifdef HAVE_TEGRA_OPTIMIZATION
#  include "tegra_round.hpp"
#endif

//! @addtogroup core_utils
//! @{

#if CV_VFP
    // 1. general scheme
    #define ARM_ROUND(_value, _asm_string) \
        int res; \
        float temp; \
        asm(_asm_string : [res] "=r" (res), [temp] "=w" (temp) : [value] "w" (_value)); \
        return res
    // 2. version for double
    #ifdef __clang__
        #define ARM_ROUND_DBL(value) ARM_ROUND(value, "vcvtr.s32.f64 %[temp], %[value] \n vmov %[res], %[temp]")
    #else
        #define ARM_ROUND_DBL(value) ARM_ROUND(value, "vcvtr.s32.f64 %[temp], %P[value] \n vmov %[res], %[temp]")
    #endif
    // 3. version for float
    #define ARM_ROUND_FLT(value) ARM_ROUND(value, "vcvtr.s32.f32 %[temp], %[value]\n vmov %[res], %[temp]")
#endif // CV_VFP

/** @brief Rounds floating-point number to the nearest integer

 @param value floating-point number. If the value is outside of INT_MIN ... INT_MAX range, the
 result is not defined.
 */
CV_INLINE int
cvRound( double value )
{
#if ((defined _MSC_VER && defined _M_X64) || (defined __GNUC__ && defined __x86_64__ \
    && defined __SSE2__ && !defined __APPLE__)) && !defined(__CUDACC__)
    __m128d t = _mm_set_sd( value );
    return _mm_cvtsd_si32(t);
#elif defined _MSC_VER && defined _M_IX86
    int t;
    __asm
    {
        fld value;
        fistp t;
    }
    return t;
#elif ((defined _MSC_VER && defined _M_ARM) || defined CV_ICC || \
        defined __GNUC__) && defined HAVE_TEGRA_OPTIMIZATION
    TEGRA_ROUND_DBL(value);
#elif defined CV_ICC || defined __GNUC__
# if CV_VFP
    ARM_ROUND_DBL(value);
# else
    return (int)lrint(value);
# endif
#else
    /* it's ok if round does not comply with IEEE754 standard;
       the tests should allow +/-1 difference when the tested functions use round */
    return (int)(value + (value >= 0 ? 0.5 : -0.5));
#endif
}


/** @brief Rounds floating-point number to the nearest integer not larger than the original.

 The function computes an integer i such that:
 \f[i \le \texttt{value} < i+1\f]
 @param value floating-point number. If the value is outside of INT_MIN ... INT_MAX range, the
 result is not defined.
 */
CV_INLINE int cvFloor( double value )
{
#if (defined _MSC_VER && defined _M_X64 || (defined __GNUC__ && defined __SSE2__ && !defined __APPLE__)) && !defined(__CUDACC__)
    __m128d t = _mm_set_sd( value );
    int i = _mm_cvtsd_si32(t);
    return i - _mm_movemask_pd(_mm_cmplt_sd(t, _mm_cvtsi32_sd(t,i)));
#elif defined __GNUC__
    int i = (int)value;
    return i - (i > value);
#else
    int i = cvRound(value);
    float diff = (float)(value - i);
    return i - (diff < 0);
#endif
}

/** @brief Rounds floating-point number to the nearest integer not larger than the original.

 The function computes an integer i such that:
 \f[i \le \texttt{value} < i+1\f]
 @param value floating-point number. If the value is outside of INT_MIN ... INT_MAX range, the
 result is not defined.
 */
CV_INLINE int cvCeil( double value )
{
#if (defined _MSC_VER && defined _M_X64 || (defined __GNUC__ && defined __SSE2__&& !defined __APPLE__)) && !defined(__CUDACC__)
    __m128d t = _mm_set_sd( value );
    int i = _mm_cvtsd_si32(t);
    return i + _mm_movemask_pd(_mm_cmplt_sd(_mm_cvtsi32_sd(t,i), t));
#elif defined __GNUC__
    int i = (int)value;
    return i + (i < value);
#else
    int i = cvRound(value);
    float diff = (float)(i - value);
    return i + (diff < 0);
#endif
}

/** @brief Determines if the argument is Not A Number.

 @param value The input floating-point value

 The function returns 1 if the argument is Not A Number (as defined by IEEE754 standard), 0
 otherwise. */
CV_INLINE int cvIsNaN( double value )
{
    Cv64suf ieee754;
    ieee754.f = value;
    return ((unsigned)(ieee754.u >> 32) & 0x7fffffff) +
           ((unsigned)ieee754.u != 0) > 0x7ff00000;
}

/** @brief Determines if the argument is Infinity.

 @param value The input floating-point value

 The function returns 1 if the argument is a plus or minus infinity (as defined by IEEE754 standard)
 and 0 otherwise. */
CV_INLINE int cvIsInf( double value )
{
    Cv64suf ieee754;
    ieee754.f = value;
    return ((unsigned)(ieee754.u >> 32) & 0x7fffffff) == 0x7ff00000 &&
            (unsigned)ieee754.u == 0;
}

#ifdef __cplusplus

/** @overload */
CV_INLINE int cvRound(float value)
{
#if ((defined _MSC_VER && defined _M_X64) || (defined __GNUC__ && defined __x86_64__ && \
      defined __SSE2__ && !defined __APPLE__)) && !defined(__CUDACC__)
    __m128 t = _mm_set_ss( value );
    return _mm_cvtss_si32(t);
#elif defined _MSC_VER && defined _M_IX86
    int t;
    __asm
    {
        fld value;
        fistp t;
    }
    return t;
#elif ((defined _MSC_VER && defined _M_ARM) || defined CV_ICC || \
        defined __GNUC__) && defined HAVE_TEGRA_OPTIMIZATION
    TEGRA_ROUND_FLT(value);
#elif defined CV_ICC || defined __GNUC__
# if CV_VFP
    ARM_ROUND_FLT(value);
# else
    return (int)lrintf(value);
# endif
#else
    /* it's ok if round does not comply with IEEE754 standard;
     the tests should allow +/-1 difference when the tested functions use round */
    return (int)(value + (value >= 0 ? 0.5f : -0.5f));
#endif
}

/** @overload */
CV_INLINE int cvRound( int value )
{
    return value;
}

/** @overload */
CV_INLINE int cvFloor( float value )
{
#if (defined _MSC_VER && defined _M_X64 || (defined __GNUC__ && defined __SSE2__ && !defined __APPLE__)) && !defined(__CUDACC__)
    __m128 t = _mm_set_ss( value );
    int i = _mm_cvtss_si32(t);
    return i - _mm_movemask_ps(_mm_cmplt_ss(t, _mm_cvtsi32_ss(t,i)));
#elif defined __GNUC__
    int i = (int)value;
    return i - (i > value);
#else
    int i = cvRound(value);
    float diff = (float)(value - i);
    return i - (diff < 0);
#endif
}

/** @overload */
CV_INLINE int cvFloor( int value )
{
    return value;
}

/** @overload */
CV_INLINE int cvCeil( float value )
{
#if (defined _MSC_VER && defined _M_X64 || (defined __GNUC__ && defined __SSE2__&& !defined __APPLE__)) && !defined(__CUDACC__)
    __m128 t = _mm_set_ss( value );
    int i = _mm_cvtss_si32(t);
    return i + _mm_movemask_ps(_mm_cmplt_ss(_mm_cvtsi32_ss(t,i), t));
#elif defined __GNUC__
    int i = (int)value;
    return i + (i < value);
#else
    int i = cvRound(value);
    float diff = (float)(i - value);
    return i + (diff < 0);
#endif
}

/** @overload */
CV_INLINE int cvCeil( int value )
{
    return value;
}

/** @overload */
CV_INLINE int cvIsNaN( float value )
{
    Cv32suf ieee754;
    ieee754.f = value;
    return (ieee754.u & 0x7fffffff) > 0x7f800000;
}

/** @overload */
CV_INLINE int cvIsInf( float value )
{
    Cv32suf ieee754;
    ieee754.f = value;
    return (ieee754.u & 0x7fffffff) == 0x7f800000;
}

#include <algorithm>

namespace cv
{

/////////////// saturate_cast (used in image & signal processing) ///////////////////

/**
 Template function for accurate conversion from one primitive type to another.

 The functions saturate_cast resemble the standard C++ cast operations, such as static_cast\<T\>()
 and others. They perform an efficient and accurate conversion from one primitive type to another
 (see the introduction chapter). saturate in the name means that when the input value v is out of the
 range of the target type, the result is not formed just by taking low bits of the input, but instead
 the value is clipped. For example:
 @code
 uchar a = saturate_cast<uchar>(-100); // a = 0 (UCHAR_MIN)
 short b = saturate_cast<short>(33333.33333); // b = 32767 (SHRT_MAX)
 @endcode
 Such clipping is done when the target type is unsigned char , signed char , unsigned short or
 signed short . For 32-bit integers, no clipping is done.

 When the parameter is a floating-point value and the target type is an integer (8-, 16- or 32-bit),
 the floating-point value is first rounded to the nearest integer and then clipped if needed (when
 the target type is 8- or 16-bit).

 This operation is used in the simplest or most complex image processing functions in OpenCV.

 @param v Function parameter.
 @sa add, subtract, multiply, divide, Mat::convertTo
 */
template<typename _Tp> static inline _Tp saturate_cast(uchar v)    { return _Tp(v); }
/** @overload */
template<typename _Tp> static inline _Tp saturate_cast(schar v)    { return _Tp(v); }
/** @overload */
template<typename _Tp> static inline _Tp saturate_cast(ushort v)   { return _Tp(v); }
/** @overload */
template<typename _Tp> static inline _Tp saturate_cast(short v)    { return _Tp(v); }
/** @overload */
template<typename _Tp> static inline _Tp saturate_cast(unsigned v) { return _Tp(v); }
/** @overload */
template<typename _Tp> static inline _Tp saturate_cast(int v)      { return _Tp(v); }
/** @overload */
template<typename _Tp> static inline _Tp saturate_cast(float v)    { return _Tp(v); }
/** @overload */
template<typename _Tp> static inline _Tp saturate_cast(double v)   { return _Tp(v); }
/** @overload */
template<typename _Tp> static inline _Tp saturate_cast(int64 v)    { return _Tp(v); }
/** @overload */
template<typename _Tp> static inline _Tp saturate_cast(uint64 v)   { return _Tp(v); }

//! @cond IGNORED

template<> inline uchar saturate_cast<uchar>(schar v)        { return (uchar)std::max((int)v, 0); }
template<> inline uchar saturate_cast<uchar>(ushort v)       { return (uchar)std::min((unsigned)v, (unsigned)UCHAR_MAX); }
template<> inline uchar saturate_cast<uchar>(int v)          { return (uchar)((unsigned)v <= UCHAR_MAX ? v : v > 0 ? UCHAR_MAX : 0); }
template<> inline uchar saturate_cast<uchar>(short v)        { return saturate_cast<uchar>((int)v); }
template<> inline uchar saturate_cast<uchar>(unsigned v)     { return (uchar)std::min(v, (unsigned)UCHAR_MAX); }
template<> inline uchar saturate_cast<uchar>(float v)        { int iv = cvRound(v); return saturate_cast<uchar>(iv); }
template<> inline uchar saturate_cast<uchar>(double v)       { int iv = cvRound(v); return saturate_cast<uchar>(iv); }
template<> inline uchar saturate_cast<uchar>(int64 v)        { return (uchar)((uint64)v <= (uint64)UCHAR_MAX ? v : v > 0 ? UCHAR_MAX : 0); }
template<> inline uchar saturate_cast<uchar>(uint64 v)       { return (uchar)std::min(v, (uint64)UCHAR_MAX); }

template<> inline schar saturate_cast<schar>(uchar v)        { return (schar)std::min((int)v, SCHAR_MAX); }
template<> inline schar saturate_cast<schar>(ushort v)       { return (schar)std::min((unsigned)v, (unsigned)SCHAR_MAX); }
template<> inline schar saturate_cast<schar>(int v)          { return (schar)((unsigned)(v-SCHAR_MIN) <= (unsigned)UCHAR_MAX ? v : v > 0 ? SCHAR_MAX : SCHAR_MIN); }
template<> inline schar saturate_cast<schar>(short v)        { return saturate_cast<schar>((int)v); }
template<> inline schar saturate_cast<schar>(unsigned v)     { return (schar)std::min(v, (unsigned)SCHAR_MAX); }
template<> inline schar saturate_cast<schar>(float v)        { int iv = cvRound(v); return saturate_cast<schar>(iv); }
template<> inline schar saturate_cast<schar>(double v)       { int iv = cvRound(v); return saturate_cast<schar>(iv); }
template<> inline schar saturate_cast<schar>(int64 v)        { return (schar)((uint64)((int64)v-SCHAR_MIN) <= (uint64)UCHAR_MAX ? v : v > 0 ? SCHAR_MAX : SCHAR_MIN); }
template<> inline schar saturate_cast<schar>(uint64 v)       { return (schar)std::min(v, (uint64)SCHAR_MAX); }

template<> inline ushort saturate_cast<ushort>(schar v)      { return (ushort)std::max((int)v, 0); }
template<> inline ushort saturate_cast<ushort>(short v)      { return (ushort)std::max((int)v, 0); }
template<> inline ushort saturate_cast<ushort>(int v)        { return (ushort)((unsigned)v <= (unsigned)USHRT_MAX ? v : v > 0 ? USHRT_MAX : 0); }
template<> inline ushort saturate_cast<ushort>(unsigned v)   { return (ushort)std::min(v, (unsigned)USHRT_MAX); }
template<> inline ushort saturate_cast<ushort>(float v)      { int iv = cvRound(v); return saturate_cast<ushort>(iv); }
template<> inline ushort saturate_cast<ushort>(double v)     { int iv = cvRound(v); return saturate_cast<ushort>(iv); }
template<> inline ushort saturate_cast<ushort>(int64 v)      { return (ushort)((uint64)v <= (uint64)USHRT_MAX ? v : v > 0 ? USHRT_MAX : 0); }
template<> inline ushort saturate_cast<ushort>(uint64 v)     { return (ushort)std::min(v, (uint64)USHRT_MAX); }

template<> inline short saturate_cast<short>(ushort v)       { return (short)std::min((int)v, SHRT_MAX); }
template<> inline short saturate_cast<short>(int v)          { return (short)((unsigned)(v - SHRT_MIN) <= (unsigned)USHRT_MAX ? v : v > 0 ? SHRT_MAX : SHRT_MIN); }
template<> inline short saturate_cast<short>(unsigned v)     { return (short)std::min(v, (unsigned)SHRT_MAX); }
template<> inline short saturate_cast<short>(float v)        { int iv = cvRound(v); return saturate_cast<short>(iv); }
template<> inline short saturate_cast<short>(double v)       { int iv = cvRound(v); return saturate_cast<short>(iv); }
template<> inline short saturate_cast<short>(int64 v)        { return (short)((uint64)((int64)v - SHRT_MIN) <= (uint64)USHRT_MAX ? v : v > 0 ? SHRT_MAX : SHRT_MIN); }
template<> inline short saturate_cast<short>(uint64 v)       { return (short)std::min(v, (uint64)SHRT_MAX); }

template<> inline int saturate_cast<int>(float v)            { return cvRound(v); }
template<> inline int saturate_cast<int>(double v)           { return cvRound(v); }

// we intentionally do not clip negative numbers, to make -1 become 0xffffffff etc.
template<> inline unsigned saturate_cast<unsigned>(float v)  { return cvRound(v); }
template<> inline unsigned saturate_cast<unsigned>(double v) { return cvRound(v); }

//! @endcond

}

#endif // __cplusplus

//! @} core_utils

#endif //__OPENCV_HAL_H__