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diff --git a/libgimpbase/gimpunit.h b/libgimpbase/gimpunit.h
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+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimpunit.h
+ * Copyright (C) 1999-2003 Michael Natterer <mitch@gimp.org>
+ *
+ * This 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.
+ *
+ * This 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 library. If not, see
+ * <https://www.gnu.org/licenses/>.
+ */
+
+#if !defined (__GIMP_BASE_H_INSIDE__) && !defined (GIMP_BASE_COMPILATION)
+#error "Only <libgimpbase/gimpbase.h> can be included directly."
+#endif
+
+#ifndef __GIMP_UNIT_H__
+#define __GIMP_UNIT_H__
+
+G_BEGIN_DECLS
+
+/* For information look into the C source or the html documentation */
+
+/**
+ * GIMP_TYPE_UNIT:
+ *
+ * #GIMP_TYPE_UNIT is a #GType derived from #G_TYPE_INT.
+ **/
+
+#define GIMP_TYPE_UNIT (gimp_unit_get_type ())
+#define GIMP_VALUE_HOLDS_UNIT(value) (G_TYPE_CHECK_VALUE_TYPE ((value), GIMP_TYPE_UNIT))
+
+GType gimp_unit_get_type (void) G_GNUC_CONST;
+
+
+/*
+ * GIMP_TYPE_PARAM_UNIT
+ */
+
+#define GIMP_TYPE_PARAM_UNIT (gimp_param_unit_get_type ())
+#define GIMP_IS_PARAM_SPEC_UNIT(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), GIMP_TYPE_PARAM_UNIT))
+
+GType gimp_param_unit_get_type (void) G_GNUC_CONST;
+
+GParamSpec * gimp_param_spec_unit (const gchar *name,
+ const gchar *nick,
+ const gchar *blurb,
+ gboolean allow_pixels,
+ gboolean allow_percent,
+ GimpUnit default_value,
+ GParamFlags flags);
+
+
+
+gint gimp_unit_get_number_of_units (void);
+gint gimp_unit_get_number_of_built_in_units (void) G_GNUC_CONST;
+
+GimpUnit gimp_unit_new (gchar *identifier,
+ gdouble factor,
+ gint digits,
+ gchar *symbol,
+ gchar *abbreviation,
+ gchar *singular,
+ gchar *plural);
+
+gboolean gimp_unit_get_deletion_flag (GimpUnit unit);
+void gimp_unit_set_deletion_flag (GimpUnit unit,
+ gboolean deletion_flag);
+
+gdouble gimp_unit_get_factor (GimpUnit unit);
+
+gint gimp_unit_get_digits (GimpUnit unit);
+gint gimp_unit_get_scaled_digits (GimpUnit unit,
+ gdouble resolution);
+
+const gchar * gimp_unit_get_identifier (GimpUnit unit);
+
+const gchar * gimp_unit_get_symbol (GimpUnit unit);
+const gchar * gimp_unit_get_abbreviation (GimpUnit unit);
+const gchar * gimp_unit_get_singular (GimpUnit unit);
+const gchar * gimp_unit_get_plural (GimpUnit unit);
+
+gchar * gimp_unit_format_string (const gchar *format,
+ GimpUnit unit);
+
+gdouble gimp_pixels_to_units (gdouble pixels,
+ GimpUnit unit,
+ gdouble resolution);
+gdouble gimp_units_to_pixels (gdouble value,
+ GimpUnit unit,
+ gdouble resolution);
+gdouble gimp_units_to_points (gdouble value,
+ GimpUnit unit,
+ gdouble resolution);
+
+gboolean gimp_unit_is_metric (GimpUnit unit);
+
+
+G_END_DECLS
+
+#endif /* __GIMP_UNIT_H__ */