[opencv] 69/89: core: fix inplace support in mulSpectrums

[Nobuhiro Iwamatsu]

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iwamatsu pushed a commit to annotated tag 2.4.13.2
in repository opencv.

commit 21f3531b17017fd5559ced15e5c41ee2e8635517
Author: Alexander Alekhin <alexander.alekhin at intel.com>
Date:   Wed Dec 7 19:27:19 2016 +0300

    core: fix inplace support in mulSpectrums
---
 modules/core/src/dxt.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/modules/core/src/dxt.cpp b/modules/core/src/dxt.cpp
index 90eb392..b94f65a 100644
--- a/modules/core/src/dxt.cpp
+++ b/modules/core/src/dxt.cpp
@@ -1905,6 +1905,12 @@ void cv::mulSpectrums( InputArray _srcA, InputArray _srcB,
     _dst.create( srcA.rows, srcA.cols, type );
     Mat dst = _dst.getMat();
 
+    // correct inplace support
+    if (dst.data == srcA.data)
+        srcA = srcA.clone();
+    if (dst.data == srcB.data)
+        srcB = srcB.clone();
+
     bool is_1d = (flags & DFT_ROWS) || (rows == 1 || (cols == 1 &&
              srcA.isContinuous() && srcB.isContinuous() && dst.isContinuous()));
 

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