# HG changeset patch
# User yexo <yexo@openttd.org>
# Date 2010-08-05 12:04:33
# Node ID b17629bb1837108ef3fe19b1d9b04718c03c2149
# Parent  450ce9deeabd54c6015ef4d8bccc94da03da05bd

(svn r20371) -Codechange: add general function to call text callbacks for airports

diff --git a/src/newgrf_airport.cpp b/src/newgrf_airport.cpp
--- a/src/newgrf_airport.cpp
+++ b/src/newgrf_airport.cpp
@@ -349,3 +349,17 @@ uint16 GetAirportCallback(CallbackID cal
 
 	return group->GetCallbackResult();
 }
+
+StringID GetAirportTextCallback(const AirportSpec *as, byte layout, uint16 callback)
+{
+	const SpriteGroup *group;
+	ResolverObject object;
+
+	NewAirportResolver(&object, INVALID_TILE, NULL, as->GetIndex(), layout);
+	object.callback = (CallbackID)callback;
+
+	group = SpriteGroup::Resolve(as->grf_prop.spritegroup, &object);
+	if (group == NULL) return STR_UNDEFINED;
+
+	return GetGRFStringID(as->grf_prop.grffile->grfid, 0xD000 + group->GetResult());
+}
diff --git a/src/newgrf_airport.h b/src/newgrf_airport.h
--- a/src/newgrf_airport.h
+++ b/src/newgrf_airport.h
@@ -117,4 +117,6 @@ uint GetNumAirportsInClass(AirportClassI
 void BindAirportSpecs();
 const AirportSpec *GetAirportSpecFromClass(AirportClassID aclass, uint airport);
 
+StringID GetAirportTextCallback(const AirportSpec *as, byte layout, uint16 callback);
+
 #endif /* NEWGRF_AIRPORT_H */