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Merge pull request #13672 from arnaudbrejeon:bug_fix_12961

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PyrDown: Fix bug #12961 (#13672)

* Force unaligned pointer and create test

* More cross-platform solution

* MSVC expects a proper order

* Remove useless clang macro
This commit is contained in:
Arnaud Brejeon 2019-01-28 10:36:00 -08:00 committed by Alexander Alekhin
parent 3585522b24
commit d998e70a25
2 changed files with 11 additions and 1 deletions
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3
modules/imgproc/src/pyramids.cpp
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@ -112,6 +112,7 @@ struct PyrDownVec_32s8u
v_rshr_pack_store<8>(dst + x, t0);
x += v_uint16::nlanes;
}
typedef int CV_DECL_ALIGNED(1) unaligned_int;
for ( ; x <= width - v_int32x4::nlanes; x += v_int32x4::nlanes)
{
v_int32x4 r0, r1, r2, r3, r4, t0;
@ -122,7 +123,7 @@ struct PyrDownVec_32s8u
r4 = v_load(row4 + x);
t0 = r0 + r4 + (r2 + r2) + ((r1 + r3 + r2) << 2);
*(int*)(dst + x) = v_reinterpret_as_s32(v_rshr_pack<8>(v_pack_u(t0, t0), v_setzero_u16())).get0();
*((unaligned_int*) (dst + x)) = v_reinterpret_as_s32(v_rshr_pack<8>(v_pack_u(t0, t0), v_setzero_u16())).get0();
}
return x;

9
modules/imgproc/test/test_filter.cpp
View File

@ -2235,4 +2235,13 @@ TEST(Imgproc_Sobel, s16_regression_13506)
Sobel(src, dst, CV_16S, 0, 1, 5);
ASSERT_EQ(0.0, cvtest::norm(dst, ref, NORM_INF));
}
TEST(Imgproc_Pyrdown, issue_12961)
{
Mat src(9, 9, CV_8UC1, Scalar::all(0));
Mat dst;
cv::pyrDown(src, dst);
ASSERT_EQ(0.0, cv::norm(dst));
}
}} // namespace