refactored approxpoly

modules/core/include/opencv2/core/core.hpp

@@ -3107,6 +3107,10 @@ public:
     void allocate(size_t _size);
     //! deallocates the buffer if it was dynamically allocated
     void deallocate();
+    //! resizes the buffer and preserves the content
+	void resize(size_t _size);
+	//! returns the current buffer size
+	size_t size() const;
     //! returns pointer to the real buffer, stack-allocated or head-allocated
     operator _Tp* ();
     //! returns read-only pointer to the real buffer, stack-allocated or head-allocated
@@ -3116,7 +3120,7 @@ protected:
     //! pointer to the real buffer, can point to buf if the buffer is small enough
     _Tp* ptr;
     //! size of the real buffer
-    size_t size;
+    size_t sz;
     //! pre-allocated buffer
     _Tp buf[fixed_size+buffer_padding];
 };

modules/core/include/opencv2/core/operations.hpp

@@ -2537,13 +2537,13 @@ inline Point LineIterator::pos() const
 template<typename _Tp, size_t fixed_size> inline AutoBuffer<_Tp, fixed_size>::AutoBuffer()
 {
     ptr = buf;
-    size = fixed_size;
+    sz = fixed_size;
 }
 
 template<typename _Tp, size_t fixed_size> inline AutoBuffer<_Tp, fixed_size>::AutoBuffer(size_t _size)
 {
     ptr = buf;
-    size = fixed_size;
+    sz = fixed_size;
     allocate(_size);
 }
 
@@ -2552,13 +2552,16 @@ template<typename _Tp, size_t fixed_size> inline AutoBuffer<_Tp, fixed_size>::~A
 
 template<typename _Tp, size_t fixed_size> inline void AutoBuffer<_Tp, fixed_size>::allocate(size_t _size)
 {
-    if(_size <= size)
+    if(_size <= sz)
+    {
+        sz = _size;
         return;
+    }
     deallocate();
     if(_size > fixed_size)
     {
-        ptr = cv::allocate<_Tp>(_size);
-        size = _size;
+        ptr = new _Tp[_size];
+        sz = _size;
     }
 }
 
@@ -2566,12 +2569,38 @@ template<typename _Tp, size_t fixed_size> inline void AutoBuffer<_Tp, fixed_size
 {
     if( ptr != buf )
     {
-        cv::deallocate<_Tp>(ptr, size);
+        delete[] ptr;
         ptr = buf;
-        size = fixed_size;
+        sz = 0;
     }
 }
 
+template<typename _Tp, size_t fixed_size> inline void AutoBuffer<_Tp, fixed_size>::resize(size_t _size)
+{
+    if(_size <= sz)
+    {
+        sz = _size;
+        return;
+    }
+    size_t i, prevsize = sz, minsize = MIN(prevsize, _size);
+    _Tp* prevptr = ptr;
+    
+    ptr = _size > fixed_size ? new _Tp[_size] : buf;
+    sz = _size;
+    
+    if( ptr != prevptr )
+        for( i = 0; i < minsize; i++ )
+            ptr[i] = prevptr[i];
+    for( i = prevsize; i < _size; i++ )
+        ptr[i] = _Tp();
+    
+    if( prevptr != buf )
+        delete[] prevptr;
+}
+
+template<typename _Tp, size_t fixed_size> inline size_t AutoBuffer<_Tp, fixed_size>::size() const
+{ return sz; }
+
 template<typename _Tp, size_t fixed_size> inline AutoBuffer<_Tp, fixed_size>::operator _Tp* ()
 { return ptr; }