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diff --git a/panels/wacom/calibrator/calibrator.h b/panels/wacom/calibrator/calibrator.h
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+++ b/panels/wacom/calibrator/calibrator.h
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+/*
+ * Copyright (c) 2009 Tias Guns
+ * Copyright (c) 2009 Soren Hauberg
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#pragma once
+
+#include <glib.h>
+#include "calibrator-gui.h"
+
+G_BEGIN_DECLS
+
+/*
+ * Number of blocks. We partition the screen into 'num_blocks' x 'num_blocks'
+ * rectangles of equal size. We then ask the user to press points that are
+ * located at the corner closes to the center of the four blocks in the corners
+ * of the screen. The following ascii art illustrates the situation. We partition
+ * the screen into 8 blocks in each direction. We then let the user press the
+ * points marked with 'O'.
+ *
+ *   +--+--+--+--+--+--+--+--+
+ *   |  |  |  |  |  |  |  |  |
+ *   +--O--+--+--+--+--+--O--+
+ *   |  |  |  |  |  |  |  |  |
+ *   +--+--+--+--+--+--+--+--+
+ *   |  |  |  |  |  |  |  |  |
+ *   +--+--+--+--+--+--+--+--+
+ *   |  |  |  |  |  |  |  |  |
+ *   +--+--+--+--+--+--+--+--+
+ *   |  |  |  |  |  |  |  |  |
+ *   +--+--+--+--+--+--+--+--+
+ *   |  |  |  |  |  |  |  |  |
+ *   +--+--+--+--+--+--+--+--+
+ *   |  |  |  |  |  |  |  |  |
+ *   +--O--+--+--+--+--+--O--+
+ *   |  |  |  |  |  |  |  |  |
+ *   +--+--+--+--+--+--+--+--+
+ */
+#define NUM_BLOCKS 8
+
+/* Names of the points */
+enum
+{
+	UL = 0, /* Upper-left  */
+	UR = 1, /* Upper-right */
+	LL = 2, /* Lower-left  */
+	LR = 3  /* Lower-right */
+};
+
+struct Calib
+{
+    /* Geometry of the calibration window */
+    GdkRectangle geometry;
+
+    /* nr of clicks registered */
+    int num_clicks;
+
+    /* click coordinates */
+    int clicked_x[4], clicked_y[4];
+
+    /* Threshold to keep the same point from being clicked twice.
+     * Set to zero if you don't want this check
+     */
+    int threshold_doubleclick;
+
+    /* Threshold to detect mis-clicks (clicks not along axes)
+     * A lower value forces more precise calibration
+     * Set to zero if you don't want this check
+     */
+    int threshold_misclick;
+};
+
+void reset      (struct Calib *c);
+gboolean add_click  (struct Calib *c,
+                 int           x,
+                 int           y);
+gboolean finish     (struct Calib *c,
+                 XYinfo       *new_axis,
+                 gboolean         *swap);
+
+G_END_DECLS