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diff --git a/libtiled/maprenderer.h b/libtiled/maprenderer.h
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+/*
+ * maprenderer.h
+ * Copyright 2009-2011, Thorbjørn Lindeijer <thorbjorn@lindeijer.nl>
+ *
+ * This file is part of libtiled.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice,
+ *       this list of conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef MAPRENDERER_H
+#define MAPRENDERER_H
+
+#include "tiled_global.h"
+
+#include <QPainter>
+
+namespace Tiled {
+
+class Layer;
+class Map;
+class MapObject;
+class TileLayer;
+
+/**
+ * This interface is used for rendering tile layers and retrieving associated
+ * metrics. The different implementations deal with different map
+ * orientations.
+ */
+class TILEDSHARED_EXPORT MapRenderer
+{
+public:
+    MapRenderer(const Map *map) : mMap(map) {}
+    virtual ~MapRenderer() {}
+
+    /**
+     * Returns the size in pixels of the map associated with this renderer.
+     */
+    virtual QSize mapSize() const = 0;
+
+    /**
+     * Returns the bounding rectangle in pixels of the given \a rect given in
+     * tile coordinates.
+     *
+     * This is useful for calculating the bounding rect of a tile layer or of
+     * a region of tiles that was changed.
+     */
+    virtual QRect boundingRect(const QRect &rect) const = 0;
+
+    /**
+     * Returns the bounding rectangle in pixels of the given \a object, as it
+     * would be drawn by drawMapObject().
+     */
+    virtual QRectF boundingRect(const MapObject *object) const = 0;
+
+    /**
+     * Returns the shape in pixels of the given \a object. This is used for
+     * mouse interaction and should match the rendered object as closely as
+     * possible.
+     */
+    virtual QPainterPath shape(const MapObject *object) const = 0;
+
+    /**
+     * Draws the tile grid in the specified \a rect using the given
+     * \a painter.
+     */
+    virtual void drawGrid(QPainter *painter, const QRectF &rect) const = 0;
+
+    /**
+     * Draws the given \a layer using the given \a painter.
+     *
+     * Optionally, you can pass in the \a exposed rect (of pixels), so that
+     * only tiles that can be visible in this area will be drawn.
+     */
+    virtual void drawTileLayer(QPainter *painter, const TileLayer *layer,
+                               const QRectF &exposed = QRectF()) const = 0;
+
+    /**
+     * Draws the tile selection given by \a region in the specified \a color.
+     *
+     * The implementation can be optimized by taking into account the
+     * \a exposed rectangle, to avoid drawing too much.
+     */
+    virtual void drawTileSelection(QPainter *painter,
+                                   const QRegion &region,
+                                   const QColor &color,
+                                   const QRectF &exposed) const = 0;
+
+    /**
+     * Draws the \a object in the given \a color using the \a painter.
+     */
+    virtual void drawMapObject(QPainter *painter,
+                               const MapObject *object,
+                               const QColor &color) const = 0;
+
+    /**
+     * Returns the tile coordinates matching the given pixel position.
+     */
+    virtual QPointF pixelToTileCoords(qreal x, qreal y) const = 0;
+
+    inline QPointF pixelToTileCoords(const QPointF &point) const
+    { return pixelToTileCoords(point.x(), point.y()); }
+
+    /**
+     * Returns the pixel coordinates matching the given tile coordinates.
+     */
+    virtual QPointF tileToPixelCoords(qreal x, qreal y) const = 0;
+
+    inline QPointF tileToPixelCoords(const QPointF &point) const
+    { return tileToPixelCoords(point.x(), point.y()); }
+
+    QPolygonF tileToPixelCoords(const QPolygonF &polygon) const
+    {
+        QPolygonF screenPolygon(polygon.size());
+        for (int i = polygon.size() - 1; i >= 0; --i)
+            screenPolygon[i] = tileToPixelCoords(polygon[i]);
+        return screenPolygon;
+    }
+
+    static QPolygonF lineToPolygon(const QPointF &start, const QPointF &end);
+
+protected:
+    /**
+     * Returns the map this renderer is associated with.
+     */
+    const Map *map() const { return mMap; }
+
+private:
+    const Map *mMap;
+};
+
+} // namespace Tiled
+
+#endif // MAPRENDERER_H