+ if (_need_render && _pending) {
+ _surface = Cairo::ImageSurface::create (_pending->data,
+ _pending->format,
+ _pending->width,
+ _pending->height,
+ _pending->stride);
+ _current = _pending;
+ }
+
+ Rect self = item_to_window (Rect (0, 0, _width, _height));
+ boost::optional<Rect> draw = self.intersection (area);
+
+ if (_surface && draw) {
+ context->set_source (_surface, self.x0, self.y0);
+ context->rectangle (draw->x0, draw->y0, draw->width(), draw->height());
+ context->fill ();