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diff --git a/libtiled/gidmapper.h b/libtiled/gidmapper.h
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+/*
+ * gidmapper.h
+ * Copyright 2011, Thorbjørn Lindeijer <thorbjorn@lindeijer.nl>
+ *
+ * This file is part of libtiled.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TILED_GIDMAPPER_H
+#define TILED_GIDMAPPER_H
+
+#include "tilelayer.h"
+
+#include <QMap>
+
+namespace Tiled {
+
+/**
+ * A class that maps cells to global IDs (gids) and back.
+ */
+class TILEDSHARED_EXPORT GidMapper
+{
+public:
+    /**
+     * Default constructor. Use \l insert to initialize the gid mapper
+     * incrementally.
+     */
+    GidMapper();
+
+    /**
+     * Constructor that initializes the gid mapper using the given \a tilesets.
+     */
+    GidMapper(const QList<Tileset *> &tilesets);
+
+    /**
+     * Insert the given \a tileset with \a firstGid as its first global ID.
+     */
+    void insert(uint firstGid, Tileset *tileset)
+    { mFirstGidToTileset.insert(firstGid, tileset); }
+
+    /**
+     * Clears the gid mapper, so that it can be reused.
+     */
+    void clear() { mFirstGidToTileset.clear(); }
+
+    /**
+     * Returns true when no tilesets are known to this gid mapper.
+     */
+    bool isEmpty() const { return mFirstGidToTileset.isEmpty(); }
+
+    /**
+     * Returns the cell data matched by the given \a gid. The \a ok parameter
+     * indicates whether an error occurred.
+     */
+    Cell gidToCell(uint gid, bool &ok) const;
+
+    /**
+     * Returns the global tile ID for the given \a cell. Returns 0 when the
+     * cell is empty or when its tileset isn't known.
+     */
+    uint cellToGid(const Cell &cell) const;
+
+    /**
+     * This sets the original tileset width. In case the image size has
+     * changed, the tile indexes will be adjusted automatically when using
+     * gidToCell().
+     */
+    void setTilesetWidth(const Tileset *tileset, int width);
+
+private:
+    QMap<uint, Tileset*> mFirstGidToTileset;
+    QMap<const Tileset*, int> mTilesetColumnCounts;
+};
+
+} // namespace Tiled
+
+#endif // TILED_GIDMAPPER_H