Add copy constructor and operator=.

src/nvimage/Image.cpp

@@ -15,11 +15,27 @@ Image::Image() : m_width(0), m_height(0), m_format(Format_RGB), m_data(NULL)
 {
 }
 
+Image::Image(const Image & img)
+{
+	allocate(img.m_width, img.m_height);
+	m_format = img.m_format;
+	memcpy(m_data, img.m_data, sizeof(Color32) * m_width * m_height);
+}
+
 Image::~Image()
 {
 	free();
 }
 
+const Image & Image::operator=(const Image & img)
+{
+	allocate(img.m_width, img.m_height);
+	m_format = img.m_format;
+	memcpy(m_data, img.m_data, sizeof(Color32) * m_width * m_height);
+	return *this;
+}
+
+
 void Image::allocate(uint w, uint h)
 {
 	m_width = w;

src/nvimage/Image.h

@@ -13,7 +13,6 @@ namespace nv
 	/// 32 bit RGBA image.
 	class NVIMAGE_CLASS Image
 	{
-		NV_FORBID_COPY(Image);
 	public:
 		
 		enum Format 
@@ -23,8 +22,12 @@ namespace nv
 		};
 		
 		Image();
+		Image(const Image & img);
 		~Image();
 
+		const Image & operator=(const Image & img);
+
+
 		void allocate(uint w, uint h);
 		bool load(const char * name);