Methods for getting the zoom state.

src/display.cpp

@@ -1817,6 +1817,16 @@ bool display::scroll(int xmove, int ymove, bool force)
 	return true;
 }
 
+bool display::zoom_at_max() const
+{
+	return zoom_ == MaxZoom;
+}
+
+bool display::zoom_at_min() const
+{
+	return zoom_ == MinZoom;
+}
+
 void display::set_zoom(int amount)
 {
 	int new_zoom = zoom_ + amount;

src/display.hpp

@@ -480,6 +480,9 @@ public:
 	 */
 	void set_zoom(int amount);
 
+	bool zoom_at_max() const;
+	bool zoom_at_min() const;
+
 	/** Sets the zoom amount to the default. */
 	void set_default_zoom();