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diff --git a/src/crystfelimageview.h b/src/crystfelimageview.h
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+/*
+ * crystfelimageview.h
+ *
+ * CrystFEL's image viewer widget
+ *
+ * Copyright © 2020 Deutsches Elektronen-Synchrotron DESY,
+ *                  a research centre of the Helmholtz Association.
+ *
+ * Authors:
+ *  2020 Thomas White <taw@physics.org>
+ *
+ * This file is part of CrystFEL.
+ *
+ * CrystFEL 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.
+ *
+ * CrystFEL 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 CrystFEL.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef CRYSTFELIMAGEVIEW_H
+#define CRYSTFELIMAGEVIEW_H
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#define CRYSTFEL_TYPE_IMAGE_VIEW (crystfel_image_view_get_type())
+
+#define CRYSTFEL_IMAGE_VIEW(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), \
+                                 CRYSTFEL_TYPE_IMAGE_VIEW, CrystFELImageView))
+
+#define CRYSTFEL_IS_IMAGE_VIEW(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj), \
+                                    CRYSTFEL_TYPE_IMAGE_VIEW))
+
+#define CRYSTFEL_IMAGE_VIEW_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((obj), \
+                                         CRYSTFEL_TYPE_IMAGE_VIEW, CrystFELImageView))
+
+#define CRYSTFEL_IS_IMAGE_VIEW_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((obj), \
+                                            CRYSTFEL_TYPE_IMAGE_VIEW))
+
+#define CRYSTFEL_IMAGE_VIEW_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj), \
+                                           CRYSTFEL_TYPE_IMAGE_VIEW, CrystFELImageView))
+
+struct _crystfelimageview
+{
+	GtkDrawingArea       parent_instance;
+
+	/*< private >*/
+	GtkIMContext        *im_context;
+
+	int                  w;   /* Surface size in pixels */
+	int                  h;
+
+	/* Redraw/scroll stuff */
+	GtkScrollablePolicy  hpol;
+	GtkScrollablePolicy  vpol;
+	GtkAdjustment       *hadj;
+	GtkAdjustment       *vadj;
+	double               x_scroll_pos;
+	double               y_scroll_pos;
+};
+
+struct _crystfelimageviewclass
+{
+	GtkDrawingAreaClass parent_class;
+};
+
+typedef struct _crystfelimageview CrystFELImageView;
+typedef struct _crystfelimageviewclass CrystFELImageViewClass;
+
+extern GType crystfel_image_view_get_type(void);
+extern GtkWidget *crystfel_image_view_new(void);
+
+
+#endif	/* CRYSTFELIMAGEVIEW_H */