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Merge pull request #3961 from apavlenko:2.4_fix_polylines_empty

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Andrey Pavlenko 2015-04-28 16:22:31 +00:00
commit 5c12c92243
2 changed files with 23 additions and 0 deletions
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3
modules/core/src/drawing.cpp
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@ -2215,7 +2215,10 @@ void cv::polylines(InputOutputArray _img, InputArrayOfArrays pts,
{
Mat p = pts.getMat(manyContours ? i : -1);
if( p.total() == 0 )
{
npts[i] = 0;
continue;
}
CV_Assert(p.checkVector(2, CV_32S) >= 0);
ptsptr[i] = (Point*)p.data;
npts[i] = p.rows*p.cols*p.channels()/2;

20
modules/core/test/test_misc.cpp
View File

@ -48,3 +48,23 @@ TEST(Core_SaturateCast, NegativeNotClipped)
ASSERT_EQ(0xffffffff, val);
}
TEST(Core_Drawing, polylines_empty)
{
Mat img(100, 100, CV_8UC1, Scalar(0));
vector<Point> pts; // empty
polylines(img, pts, false, Scalar(255));
int cnt = countNonZero(img);
ASSERT_EQ(cnt, 0);
}
TEST(Core_Drawing, polylines)
{
Mat img(100, 100, CV_8UC1, Scalar(0));
vector<Point> pts;
pts.push_back(Point(0, 0));
pts.push_back(Point(20, 0));
polylines(img, pts, false, Scalar(255));
int cnt = countNonZero(img);
ASSERT_EQ(cnt, 21);
}