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Merge pull request #16858 from alalek:core_fix_empty_iterator_begin_end

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This commit is contained in:
Alexander Alekhin 2020-03-20 19:32:55 +00:00
commit 183e4d50ed
2 changed files with 19 additions and 0 deletions
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11
modules/core/include/opencv2/core/mat.inl.hpp
View File

@ -1304,6 +1304,8 @@ const _Tp& Mat::at(const Vec<int, n>& idx) const
template<typename _Tp> inline
MatConstIterator_<_Tp> Mat::begin() const
{
if (empty())
return MatConstIterator_<_Tp>();
CV_DbgAssert( elemSize() == sizeof(_Tp) );
return MatConstIterator_<_Tp>((const Mat_<_Tp>*)this);
}
@ -1311,6 +1313,8 @@ MatConstIterator_<_Tp> Mat::begin() const
template<typename _Tp> inline
MatConstIterator_<_Tp> Mat::end() const
{
if (empty())
return MatConstIterator_<_Tp>();
CV_DbgAssert( elemSize() == sizeof(_Tp) );
MatConstIterator_<_Tp> it((const Mat_<_Tp>*)this);
it += total();
@ -1320,6 +1324,8 @@ MatConstIterator_<_Tp> Mat::end() const
template<typename _Tp> inline
MatIterator_<_Tp> Mat::begin()
{
if (empty())
return MatIterator_<_Tp>();
CV_DbgAssert( elemSize() == sizeof(_Tp) );
return MatIterator_<_Tp>((Mat_<_Tp>*)this);
}
@ -1327,6 +1333,8 @@ MatIterator_<_Tp> Mat::begin()
template<typename _Tp> inline
MatIterator_<_Tp> Mat::end()
{
if (empty())
return MatIterator_<_Tp>();
CV_DbgAssert( elemSize() == sizeof(_Tp) );
MatIterator_<_Tp> it((Mat_<_Tp>*)this);
it += total();
@ -2690,6 +2698,7 @@ MatConstIterator::MatConstIterator(const Mat* _m)
{
if( m && m->isContinuous() )
{
CV_Assert(!m->empty());
sliceStart = m->ptr();
sliceEnd = sliceStart + m->total()*elemSize;
}
@ -2703,6 +2712,7 @@ MatConstIterator::MatConstIterator(const Mat* _m, int _row, int _col)
CV_Assert(m && m->dims <= 2);
if( m->isContinuous() )
{
CV_Assert(!m->empty());
sliceStart = m->ptr();
sliceEnd = sliceStart + m->total()*elemSize;
}
@ -2717,6 +2727,7 @@ MatConstIterator::MatConstIterator(const Mat* _m, Point _pt)
CV_Assert(m && m->dims <= 2);
if( m->isContinuous() )
{
CV_Assert(!m->empty());
sliceStart = m->ptr();
sliceEnd = sliceStart + m->total()*elemSize;
}

8
modules/core/test/test_mat.cpp
View File

@ -2082,4 +2082,12 @@ TEST(Mat, regression_12943) // memory usage: ~4.5 Gb
cv::flip(src, dst, 0);
}
TEST(Mat, empty_iterator_16855)
{
cv::Mat m;
EXPECT_NO_THROW(m.begin<uchar>());
EXPECT_NO_THROW(m.end<uchar>());
EXPECT_TRUE(m.begin<uchar>() == m.end<uchar>());
}
}} // namespace