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diff --git a/libdimension/dimension/pattern/map.h b/libdimension/dimension/pattern/map.h
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+/*************************************************************************
+ * Copyright (C) 2009-2014 Tavian Barnes <tavianator@tavianator.com>     *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library is free software; you can redistribute it and/  *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension Library 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  *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+/**
+ * @file
+ * Generic maps (backend for pigment_maps, etc.).
+ */
+
+/** A map. */
+typedef struct dmnsn_map dmnsn_map;
+
+/**
+ * Create an empty map.
+ * @param[in] pool  The memory pool to allocate from.
+ * @param[in] size  The size of the objects to store in the map.
+ * @return A map with no entries.
+ */
+dmnsn_map *dmnsn_new_map(dmnsn_pool *pool, size_t size);
+
+/**
+ * Add an entry (a scalar-object pair) to a map.
+ * @param[in,out] map  The map to add to.
+ * @param[in]     n    The index of the entry.
+ * @param[in]     obj  The value of the entry.
+ */
+void dmnsn_map_add_entry(dmnsn_map *map, double n, const void *obj);
+
+/**
+ * Return the number of entries in a map.
+ * @param[in] map  The map to measure.
+ * @return The size of \p map.
+ */
+size_t dmnsn_map_size(const dmnsn_map *map);
+
+/**
+ * Evaluate a map.
+ * @param[in]  map   The map to evaluate.
+ * @param[in]  n     The index to evaluate.
+ * @param[out] val   The normalized distance of \p n from \p obj1.
+ * @param[out] obj1  The first object.
+ * @param[out] obj2  The second object.
+ */
+void dmnsn_map_evaluate(const dmnsn_map *map, double n,
+                        double *val, void *obj1, void *obj2);
+
+/**
+ * Apply a callback to each element of a map.
+ * @param[in,out] map       The map.
+ * @param[in]     callback  The callback to apply to the elements.
+ */
+void dmnsn_map_apply(dmnsn_map *map, dmnsn_callback_fn *callback);