Clarified default allocator interface.

Conflicts:
	modules/core/src/matrix.cpp

modules/core/src/matrix.cpp

@@ -218,10 +218,27 @@ public:
         delete u;
     }
 };
+namespace
+{
+	MatAllocator* g_matAllocator = nullptr;
+}
 
+
+MatAllocator* Mat::getDefaultAllocator()
+{
+	if (g_matAllocator == nullptr)
+	{
+		g_matAllocator = getStdAllocator();
+	}
+	return g_matAllocator;
+}
+void Mat::setDefaultAllocator(MatAllocator* allocator)
+{
+	g_matAllocator = allocator;
+}
 MatAllocator* Mat::getStdAllocator()
 {
-    CV_SINGLETON_LAZY_INIT(MatAllocator, new StdMatAllocator())
+	CV_SINGLETON_LAZY_INIT(MatAllocator, new StdMatAllocator())
 }
 
 void swap( Mat& a, Mat& b )
@@ -388,7 +405,7 @@ void Mat::create(int d, const int* _sizes, int _type)
 
     if( total() > 0 )
     {
-        MatAllocator *a = allocator, *a0 = getStdAllocator();
+        MatAllocator *a = allocator, *a0 = getDefaultAllocator();
 #ifdef HAVE_TGPU
         if( !a || a == tegra::getAllocator() )
             a = tegra::getAllocator(d, _sizes, _type);
@@ -426,7 +443,7 @@ void Mat::copySize(const Mat& m)
 void Mat::deallocate()
 {
     if(u)
-        (u->currAllocator ? u->currAllocator : allocator ? allocator : getStdAllocator())->unmap(u);
+        (u->currAllocator ? u->currAllocator : allocator ? allocator : getDefaultAllocator())->unmap(u);
     u = NULL;
 }
 

modules/core/src/ocl.cpp

@@ -4292,7 +4292,7 @@ public:
         bufferPoolSVM.setMaxReservedSize(poolSize);
 #endif
 
-        matStdAllocator = Mat::getStdAllocator();
+        matStdAllocator = Mat::getDefaultAllocator();
     }
 
     UMatData* defaultAllocate(int dims, const int* sizes, int type, void* data, size_t* step,
@@ -4918,7 +4918,7 @@ public:
 
         if( u->data && !u->hostCopyObsolete() )
         {
-            Mat::getStdAllocator()->download(u, dstptr, dims, sz, srcofs, srcstep, dststep);
+            Mat::getDefaultAllocator()->download(u, dstptr, dims, sz, srcofs, srcstep, dststep);
             return;
         }
         CV_Assert( u->handle != 0 );
@@ -5042,7 +5042,7 @@ public:
         //    2. we overwrite part of the matrix, but the GPU copy is out-of-date
         if( u->data && (u->hostCopyObsolete() < u->deviceCopyObsolete() || total == u->size))
         {
-            Mat::getStdAllocator()->upload(u, srcptr, dims, sz, dstofs, dststep, srcstep);
+            Mat::getDefaultAllocator()->upload(u, srcptr, dims, sz, dstofs, dststep, srcstep);
             u->markHostCopyObsolete(false);
             u->markDeviceCopyObsolete(true);
             return;

modules/core/src/umatrix.cpp

@@ -94,7 +94,7 @@ UMatData::~UMatData()
             // simulate Mat::deallocate
             if (u->mapcount != 0)
             {
-                (u->currAllocator ? u->currAllocator : /* TODO allocator ? allocator :*/ Mat::getStdAllocator())->unmap(u);
+                (u->currAllocator ? u->currAllocator : /* TODO allocator ? allocator :*/ Mat::getDefaultAllocator())->unmap(u);
             }
             else
             {
@@ -144,7 +144,7 @@ MatAllocator* UMat::getStdAllocator()
     if( ocl::haveOpenCL() && ocl::useOpenCL() )
         return ocl::getOpenCLAllocator();
 #endif
-    return Mat::getStdAllocator();
+    return Mat::getDefaultAllocator();
 }
 
 void swap( UMat& a, UMat& b )
@@ -286,7 +286,7 @@ UMat Mat::getUMat(int accessFlags, UMatUsageFlags usageFlags) const
     accessFlags |= ACCESS_RW;
     UMatData* new_u = NULL;
     {
-        MatAllocator *a = allocator, *a0 = getStdAllocator();
+        MatAllocator *a = allocator, *a0 = getDefaultAllocator();
         if(!a)
             a = a0;
         new_u = a->allocate(dims, size.p, type(), data, step.p, accessFlags, usageFlags);
@@ -302,7 +302,7 @@ UMat Mat::getUMat(int accessFlags, UMatUsageFlags usageFlags) const
     }
     if (!allocated)
     {
-        allocated = getStdAllocator()->allocate(new_u, accessFlags, usageFlags);
+        allocated = getDefaultAllocator()->allocate(new_u, accessFlags, usageFlags);
         CV_Assert(allocated);
     }
     if (u != NULL)
@@ -358,7 +358,7 @@ void UMat::create(int d, const int* _sizes, int _type, UMatUsageFlags _usageFlag
         if (!a)
         {
             a = a0;
-            a0 = Mat::getStdAllocator();
+            a0 = Mat::getDefaultAllocator();
         }
         try
         {