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core: wrap custom types via _RawArray (raw() call)

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- support passing of `std::vector<KeyPoint>` via InputArray
pull/12377/head
Alexander Alekhin 6 years ago
parent aa5c45339c
commit a0f86479e0
4 changed files with 186 additions and 0 deletions
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  1. 28
      modules/core/include/opencv2/core/mat.hpp
  2. 78
      modules/core/include/opencv2/core/mat.inl.hpp
  3. 21
      modules/core/src/matrix_wrap.cpp
  4. 59
      modules/core/test/test_mat.cpp

28
modules/core/include/opencv2/core/mat.hpp
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@ -148,6 +148,12 @@ synonym is needed to generate Python/Java etc. wrappers properly. At the functio
level their use is similar, but _InputArray::getMat(idx) should be used to get header for the
idx-th component of the outer vector and _InputArray::size().area() should be used to find the
number of components (vectors/matrices) of the outer vector.
In general, type support is limited to cv::Mat types. Other types are forbidden.
But in some cases we need to support passing of custom non-general Mat types, like arrays of cv::KeyPoint, cv::DMatch, etc.
This data is not intented to be interpreted as an image data, or processed somehow like regular cv::Mat.
To pass such custom type use rawIn() / rawOut() / rawInOut() wrappers.
Custom type is wrapped as Mat-compatible `CV_8UC<N>` values (N = sizeof(T), N <= CV_CN_MAX).
*/
class CV_EXPORTS _InputArray
{
@ -203,6 +209,11 @@ public:
template<std::size_t _Nm> _InputArray(const std::array<Mat, _Nm>& arr);
#endif
template<typename _Tp> static _InputArray rawIn(const std::vector<_Tp>& vec);
#ifdef CV_CXX_STD_ARRAY
template<typename _Tp, std::size_t _Nm> static _InputArray rawIn(const std::array<_Tp, _Nm>& arr);
#endif
Mat getMat(int idx=-1) const;
Mat getMat_(int idx=-1) const;
UMat getUMat(int idx=-1) const;
@ -339,6 +350,11 @@ public:
template<std::size_t _Nm> _OutputArray(const std::array<Mat, _Nm>& arr);
#endif
template<typename _Tp> static _OutputArray rawOut(std::vector<_Tp>& vec);
#ifdef CV_CXX_STD_ARRAY
template<typename _Tp, std::size_t _Nm> static _OutputArray rawOut(std::array<_Tp, _Nm>& arr);
#endif
bool fixedSize() const;
bool fixedType() const;
bool needed() const;
@ -408,8 +424,20 @@ public:
template<std::size_t _Nm> _InputOutputArray(const std::array<Mat, _Nm>& arr);
#endif
template<typename _Tp> static _InputOutputArray rawInOut(std::vector<_Tp>& vec);
#ifdef CV_CXX_STD_ARRAY
template<typename _Tp, std::size_t _Nm> _InputOutputArray rawInOut(std::array<_Tp, _Nm>& arr);
#endif
};
/** Helper to wrap custom types. @see InputArray */
template<typename _Tp> static inline _InputArray rawIn(_Tp& v);
/** Helper to wrap custom types. @see InputArray */
template<typename _Tp> static inline _OutputArray rawOut(_Tp& v);
/** Helper to wrap custom types. @see InputArray */
template<typename _Tp> static inline _InputOutputArray rawInOut(_Tp& v);
CV__DEBUG_NS_END
typedef const _InputArray& InputArray;

78
modules/core/include/opencv2/core/mat.inl.hpp
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@ -61,6 +61,16 @@ CV__DEBUG_NS_BEGIN
//! @cond IGNORED
////////////////////////// Custom (raw) type wrapper //////////////////////////
template<typename _Tp> static inline
int rawType()
{
CV_StaticAssert(sizeof(_Tp) <= CV_CN_MAX, "sizeof(_Tp) is too large");
const int elemSize = sizeof(_Tp);
return (int)CV_MAKETYPE(CV_8U, elemSize);
}
//////////////////////// Input/Output Arrays ////////////////////////
inline void _InputArray::init(int _flags, const void* _obj)
@ -140,6 +150,27 @@ inline _InputArray::_InputArray(const ogl::Buffer& buf)
inline _InputArray::_InputArray(const cuda::HostMem& cuda_mem)
{ init(CUDA_HOST_MEM + ACCESS_READ, &cuda_mem); }
template<typename _Tp> inline
_InputArray _InputArray::rawIn(const std::vector<_Tp>& vec)
{
_InputArray v;
v.flags = _InputArray::FIXED_TYPE + _InputArray::STD_VECTOR + rawType<_Tp>() + ACCESS_READ;
v.obj = (void*)&vec;
return v;
}
#ifdef CV_CXX_STD_ARRAY
template<typename _Tp, std::size_t _Nm> inline
_InputArray _InputArray::rawIn(const std::array<_Tp, _Nm>& arr)
{
_InputArray v;
v.flags = FIXED_TYPE + FIXED_SIZE + STD_ARRAY + traits::Type<_Tp>::value + ACCESS_READ;
v.obj = (void*)arr.data();
v.sz = Size(1, _Nm);
return v;
}
#endif
inline _InputArray::~_InputArray() {}
inline Mat _InputArray::getMat(int i) const
@ -279,6 +310,27 @@ inline _OutputArray::_OutputArray(const ogl::Buffer& buf)
inline _OutputArray::_OutputArray(const cuda::HostMem& cuda_mem)
{ init(FIXED_TYPE + FIXED_SIZE + CUDA_HOST_MEM + ACCESS_WRITE, &cuda_mem); }
template<typename _Tp> inline
_OutputArray _OutputArray::rawOut(std::vector<_Tp>& vec)
{
_OutputArray v;
v.flags = _InputArray::FIXED_TYPE + _InputArray::STD_VECTOR + rawType<_Tp>() + ACCESS_WRITE;
v.obj = (void*)&vec;
return v;
}
#ifdef CV_CXX_STD_ARRAY
template<typename _Tp, std::size_t _Nm> inline
_OutputArray _OutputArray::rawOut(std::array<_Tp, _Nm>& arr)
{
_OutputArray v;
v.flags = FIXED_TYPE + FIXED_SIZE + STD_ARRAY + traits::Type<_Tp>::value + ACCESS_WRITE;
v.obj = (void*)arr.data();
v.sz = Size(1, _Nm);
return v;
}
#endif
///////////////////////////////////////////////////////////////////////////////////////////
inline _InputOutputArray::_InputOutputArray() { init(ACCESS_RW, 0); }
@ -395,6 +447,32 @@ inline _InputOutputArray::_InputOutputArray(const ogl::Buffer& buf)
inline _InputOutputArray::_InputOutputArray(const cuda::HostMem& cuda_mem)
{ init(FIXED_TYPE + FIXED_SIZE + CUDA_HOST_MEM + ACCESS_RW, &cuda_mem); }
template<typename _Tp> inline
_InputOutputArray _InputOutputArray::rawInOut(std::vector<_Tp>& vec)
{
_InputOutputArray v;
v.flags = _InputArray::FIXED_TYPE + _InputArray::STD_VECTOR + rawType<_Tp>() + ACCESS_RW;
v.obj = (void*)&vec;
return v;
}
#ifdef CV_CXX_STD_ARRAY
template<typename _Tp, std::size_t _Nm> inline
_InputOutputArray _InputOutputArray::rawInOut(std::array<_Tp, _Nm>& arr)
{
_InputOutputArray v;
v.flags = FIXED_TYPE + FIXED_SIZE + STD_ARRAY + traits::Type<_Tp>::value + ACCESS_RW;
v.obj = (void*)arr.data();
v.sz = Size(1, _Nm);
return v;
}
#endif
template<typename _Tp> static inline _InputArray rawIn(_Tp& v) { return _InputArray::rawIn(v); }
template<typename _Tp> static inline _OutputArray rawOut(_Tp& v) { return _OutputArray::rawOut(v); }
template<typename _Tp> static inline _InputOutputArray rawInOut(_Tp& v) { return _InputOutputArray::rawInOut(v); }
CV__DEBUG_NS_END
//////////////////////////////////////////// Mat //////////////////////////////////////////

21
modules/core/src/matrix_wrap.cpp
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@ -1413,18 +1413,39 @@ void _OutputArray::create(int d, const int* sizes, int mtype, int i,
case 16:
((std::vector<Vec4i>*)v)->resize(len);
break;
case 20:
((std::vector<Vec<int, 5> >*)v)->resize(len);
break;
case 24:
((std::vector<Vec6i>*)v)->resize(len);
break;
case 28:
((std::vector<Vec<int, 7> >*)v)->resize(len);
break;
case 32:
((std::vector<Vec8i>*)v)->resize(len);
break;
case 36:
((std::vector<Vec<int, 9> >*)v)->resize(len);
break;
case 40:
((std::vector<Vec<int, 10> >*)v)->resize(len);
break;
case 44:
((std::vector<Vec<int, 11> >*)v)->resize(len);
break;
case 48:
((std::vector<Vec<int, 12> >*)v)->resize(len);
break;
case 52:
((std::vector<Vec<int, 13> >*)v)->resize(len);
break;
case 56:
((std::vector<Vec<int, 14> >*)v)->resize(len);
break;
case 60:
((std::vector<Vec<int, 15> >*)v)->resize(len);
break;
case 64:
((std::vector<Vec<int, 16> >*)v)->resize(len);
break;

59
modules/core/test/test_mat.cpp
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@ -1882,4 +1882,63 @@ TEST(Core_Split, crash_12171)
EXPECT_EQ(2, dst2.ptr<uchar>(1)[1]);
}
struct CustomType // like cv::Keypoint
{
Point2f pt;
float size;
float angle;
float response;
int octave;
int class_id;
};
static void test_CustomType(InputArray src_, OutputArray dst_)
{
Mat src = src_.getMat();
ASSERT_EQ(sizeof(CustomType), src.elemSize());
CV_CheckTypeEQ(src.type(), CV_MAKETYPE(CV_8U, sizeof(CustomType)), "");
CustomType* kpt = NULL;
{
Mat dst = dst_.getMat();
for (size_t i = 0; i < dst.total(); i++)
{
kpt = dst.ptr<CustomType>(0) + i;
kpt->octave = (int)i;
}
}
const int N = (int)src.total();
dst_.create(1, N * 2, rawType<CustomType>());
Mat dst = dst_.getMat();
for (size_t i = N; i < dst.total(); i++)
{
kpt = dst.ptr<CustomType>(0) + i;
kpt->octave = -(int)i;
}
#if 0 // Compilation error
CustomType& kpt = dst.at<CustomType>(0, 5);
#endif
}
TEST(Core_InputArray, support_CustomType)
{
std::vector<CustomType> kp1(5);
std::vector<CustomType> kp2(3);
test_CustomType(rawIn(kp1), rawOut(kp2));
ASSERT_EQ((size_t)10, kp2.size());
for (int i = 0; i < 3; i++)
{
EXPECT_EQ(i, kp2[i].octave);
}
for (int i = 3; i < 5; i++)
{
EXPECT_EQ(0, kp2[i].octave);
}
for (int i = 5; i < 10; i++)
{
EXPECT_EQ(-i, kp2[i].octave);
}
}
}} // namespace

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