[popsift] plane_2d: Use size_t type for memory size in bytes

Use size_t type to avoid short type overflow with large size images.

Author: gregoire-dl

src/popsift/common/plane_2d.h

@@ -168,10 +168,10 @@ template <typename T> struct PitchPlane2D : public PlaneT<T>
         PlaneBase::freeHost2D( this->data, mode );
     }
     __host__ __device__
-    inline short getPitchInBytes( ) const { return _pitchInBytes; }
+    inline size_t getPitchInBytes( ) const { return _pitchInBytes; }
 
 protected:
-    int _pitchInBytes; // pitch width in bytes
+    size_t _pitchInBytes; // pitch width in bytes
 };
 
 /*************************************************************
@@ -338,7 +338,7 @@ template <typename T> class Plane2D : public PitchPlane2D<T>
     __host__ __device__
     inline short getHeight( ) const { return _rows; }
     __host__ __device__
-    inline short getByteSize( ) const { return this->_pitchInBytes*_rows; }
+    inline size_t getByteSize( ) const { return this->_pitchInBytes * _rows; }
 
     __host__ inline void allocDev( int w, int h ) {
         _cols = w;