Fixed text alignment to be visible based rather than surface based

sdl_helpers.h

@@ -66,8 +66,9 @@ TTF_Font* get_font(int size, const std::string& filename = default_font_name);
 // Returns a rect to use during bliting of 2 surfaces
 // base - surface on which the other is applied to
 // applied - the surface which will be applied to the other
+// hint - rect to hint visible area from applied - can be NULL
 SDL_Rect surface_align(const SDL_Surface* base, const SDL_Surface* applied,
-	HorizontalAlign halign, VerticalAlign valign);
+	HorizontalAlign halign, VerticalAlign valign, const SDL_Rect* hint = nullptr);
 
 // Reads the file and tries to parse a JSON file with comments
 // cfg - output json struct