Fixed wrong buffer substitution in Signal class

With the CONTIGUOUS_ZEROCOPY signal data format, since the memory is not owned by the Signal object it should not be modified. Changing the buffer in this case means only updating the pointer to the first element and the signal width.

toolbox/src/base/Signal.cpp

@@ -320,10 +320,8 @@ bool Signal::setBuffer(const T* data, const unsigned& length)
             std::copy(data, data + length, getBuffer<T>());
             break;
         case DataFormat::CONTIGUOUS_ZEROCOPY:
-            // Reset current data
-            std::fill(getBuffer<T>(), getBuffer<T>() + m_width, 0);
-            // Copy new data
-            std::copy(data, data + length, getBuffer<T>());
+            // Override the buffer pointer
+            m_bufferPtr = static_cast<void*>(const_cast<T*>(data));
             // Update the width
             m_width = length;
             break;