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diff --git a/app/widgets/gimphistogramview.h b/app/widgets/gimphistogramview.h
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+++ b/app/widgets/gimphistogramview.h
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * 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 3 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 <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_HISTOGRAM_VIEW_H__
+#define __GIMP_HISTOGRAM_VIEW_H__
+
+
+#define GIMP_TYPE_HISTOGRAM_VIEW            (gimp_histogram_view_get_type ())
+#define GIMP_HISTOGRAM_VIEW(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_HISTOGRAM_VIEW, GimpHistogramView))
+#define GIMP_HISTOGRAM_VIEW_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_HISTOGRAM_VIEW, GimpHistogramViewClass))
+#define GIMP_IS_HISTOGRAM_VIEW(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_HISTOGRAM_VIEW))
+#define GIMP_IS_HISTOGRAM_VIEW_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_HISTOGRAM_VIEW))
+#define GIMP_HISTOGRAM_VIEW_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_HISTOGRAM_VIEW, GimpHistogramViewClass))
+
+
+typedef struct _GimpHistogramViewClass  GimpHistogramViewClass;
+
+struct _GimpHistogramView
+{
+  GtkDrawingArea         parent_instance;
+
+  GimpHistogram         *histogram;
+  GimpHistogram         *bg_histogram;
+  GimpHistogramChannel   channel;
+  GimpHistogramScale     scale;
+  gint                   n_bins;
+  gint                   start;
+  gint                   end;
+
+  gint                   border_width;
+  gint                   subdivisions;
+};
+
+struct _GimpHistogramViewClass
+{
+  GtkDrawingAreaClass  parent_class;
+
+  void (* range_changed) (GimpHistogramView *view,
+                          gint               start,
+                          gint               end);
+};
+
+
+GType           gimp_histogram_view_get_type       (void) G_GNUC_CONST;
+
+GtkWidget     * gimp_histogram_view_new            (gboolean             range);
+
+void            gimp_histogram_view_set_histogram  (GimpHistogramView   *view,
+                                                    GimpHistogram       *histogram);
+GimpHistogram * gimp_histogram_view_get_histogram  (GimpHistogramView   *view);
+
+void            gimp_histogram_view_set_background (GimpHistogramView   *view,
+                                                    GimpHistogram       *histogram);
+GimpHistogram * gimp_histogram_view_get_background (GimpHistogramView   *view);
+
+void            gimp_histogram_view_set_channel    (GimpHistogramView   *view,
+                                                    GimpHistogramChannel channel);
+GimpHistogramChannel
+                gimp_histogram_view_get_channel    (GimpHistogramView   *view);
+
+void            gimp_histogram_view_set_scale      (GimpHistogramView   *view,
+                                                    GimpHistogramScale   scale);
+GimpHistogramScale
+                gimp_histogram_view_get_scale      (GimpHistogramView   *view);
+
+void            gimp_histogram_view_set_range      (GimpHistogramView   *view,
+                                                    gint                 start,
+                                                    gint                 end);
+void            gimp_histogram_view_get_range      (GimpHistogramView   *view,
+                                                    gint                *start,
+                                                    gint                *end);
+
+
+#endif /* __GIMP_HISTOGRAM_VIEW_H__ */