Changed: Helper functions (clear, empty) for CTextureId

--HG--
branch : html-improvements

code/nel/include/nel/gui/view_renderer.h

@@ -101,6 +101,12 @@ namespace NLGUI
 				return _TextureId;
 			}
 
+			// Return true if TextureId is not set
+			bool empty() const { return _TextureId < 0; };
+
+			// delete TextureId if set
+			void clear();
+
 			void serial(NLMISC::IStream &f);
 
 		private:

code/nel/src/gui/view_renderer.cpp

@@ -1932,6 +1932,16 @@ namespace NLGUI
 		return _TextureId >= 0;
 	}
 
+	// ***************************************************************************
+	void CViewRenderer::CTextureId::clear()
+	{
+		if (_TextureId >= 0)
+		{
+			CViewRenderer::getInstance()->deleteTexture(_TextureId);
+			_TextureId = -1;
+		}
+	}
+
 	// ***************************************************************************
 	void CViewRenderer::CTextureId::serial(NLMISC::IStream &f)
 	{