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* @return <tt>true</tt> if the image may need updating.
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bool advance(const Glib::TimeVal& current_time);
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/** Possibly advances an animation to a new frame. Chooses the frame based
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* on the start time passed to Gdk::PixbufAnimation::get_iter().
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* If this function returns false, there's no need to update the animation
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* display, assuming the display had been rendered prior to advancing;
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* if true, you need to call get_pixbuf() and update the