fix cuda mem leak and move cuda malloc out of critical path

Author: kevinchristensen1

modules/cudaimgproc/src/cuda/gftt.cu

@@ -87,25 +87,22 @@ namespace cv { namespace cuda { namespace device
             }
         }
 
-        int findCorners_gpu(const cudaTextureObject_t &eigTex, const int &rows, const int &cols, float threshold, PtrStepSzb mask, float2* corners, int max_count, cudaStream_t stream)
+        int findCorners_gpu(const cudaTextureObject_t &eigTex, const int &rows, const int &cols, float threshold, PtrStepSzb mask, float2* corners, int max_count, int* counterPtr, cudaStream_t stream)
         {
-            int* counter_ptr;
-            cudaSafeCall( cudaMalloc(&counter_ptr, sizeof(int)) );
-
-            cudaSafeCall( cudaMemsetAsync(counter_ptr, 0, sizeof(int), stream) );
+            cudaSafeCall( cudaMemsetAsync(counterPtr, 0, sizeof(int), stream) );
 
             dim3 block(16, 16);
             dim3 grid(divUp(cols, block.x), divUp(rows, block.y));
 
             if (mask.data)
-                findCorners<<<grid, block, 0, stream>>>(threshold, SingleMask(mask), corners, max_count, rows, cols, eigTex, counter_ptr);
+                findCorners<<<grid, block, 0, stream>>>(threshold, SingleMask(mask), corners, max_count, rows, cols, eigTex, counterPtr);
             else
-                findCorners<<<grid, block, 0, stream>>>(threshold, WithOutMask(), corners, max_count, rows, cols, eigTex, counter_ptr);
+                findCorners<<<grid, block, 0, stream>>>(threshold, WithOutMask(), corners, max_count, rows, cols, eigTex, counterPtr);
 
             cudaSafeCall( cudaGetLastError() );
 
             int count;
-            cudaSafeCall( cudaMemcpyAsync(&count, counter_ptr, sizeof(int), cudaMemcpyDeviceToHost, stream) );
+            cudaSafeCall( cudaMemcpyAsync(&count, counterPtr, sizeof(int), cudaMemcpyDeviceToHost, stream) );
             if (stream)
                 cudaSafeCall(cudaStreamSynchronize(stream));
             else

modules/cudaimgproc/src/gftt.cpp

@@ -55,7 +55,7 @@ namespace cv { namespace cuda { namespace device
 {
     namespace gfft
     {
-        int findCorners_gpu(const cudaTextureObject_t &eigTex_, const int &rows, const int &cols, float threshold, PtrStepSzb mask, float2* corners, int max_count, cudaStream_t stream);
+        int findCorners_gpu(const cudaTextureObject_t &eigTex_, const int &rows, const int &cols, float threshold, PtrStepSzb mask, float2* corners, int max_count, int* counterPtr, cudaStream_t stream);
         void sortCorners_gpu(const cudaTextureObject_t &eigTex_, float2* corners, int count, cudaStream_t stream);
     }
 }}}
@@ -67,7 +67,7 @@ namespace
     public:
         GoodFeaturesToTrackDetector(int srcType, int maxCorners, double qualityLevel, double minDistance,
                                     int blockSize, bool useHarrisDetector, double harrisK);
-
+        ~GoodFeaturesToTrackDetector();
         void detect(InputArray image, OutputArray corners, InputArray mask, Stream& stream);
 
     private:
@@ -82,6 +82,8 @@ namespace
         GpuMat buf_;
         GpuMat eig_;
         GpuMat tmpCorners_;
+
+        int* counterPtr_;
     };
 
     GoodFeaturesToTrackDetector::GoodFeaturesToTrackDetector(int srcType, int maxCorners, double qualityLevel, double minDistance,
@@ -93,6 +95,12 @@ namespace
         cornerCriteria_ = useHarrisDetector ?
                     cuda::createHarrisCorner(srcType, blockSize, 3, harrisK) :
                     cuda::createMinEigenValCorner(srcType, blockSize, 3);
+        cudaSafeCall(cudaMalloc(&counterPtr_, sizeof(int)));
+    }
+
+    GoodFeaturesToTrackDetector::~GoodFeaturesToTrackDetector()
+    {
+        cudaSafeCall(cudaFree(counterPtr_));
     }
 
     void GoodFeaturesToTrackDetector::detect(InputArray _image, OutputArray _corners, InputArray _mask, Stream& stream)
@@ -125,7 +133,7 @@ namespace
         PtrStepSzf eig = eig_;
         cv::cuda::device::createTextureObjectPitch2D<float>(&eigTex_, eig, texDesc);
 
-        int total = findCorners_gpu(eigTex_, eig_.rows, eig_.cols, static_cast<float>(maxVal * qualityLevel_), mask, tmpCorners_.ptr<float2>(), tmpCorners_.cols, stream_);
+        int total = findCorners_gpu(eigTex_, eig_.rows, eig_.cols, static_cast<float>(maxVal * qualityLevel_), mask, tmpCorners_.ptr<float2>(), tmpCorners_.cols, counterPtr_, stream_);
 
 
         if (total == 0)