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+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimprectangle.c
+ *
+ * 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/>.
+ */
+
+#include "config.h"
+
+#include <glib.h>
+
+#include "gimprectangle.h"
+
+
+/**
+ * SECTION: gimprectangle
+ * @title: gimprectangle
+ * @short_description: Utility functions dealing with rectangle extents.
+ *
+ * Utility functions dealing with rectangle extents.
+ **/
+
+
+/**
+ * gimp_rectangle_intersect:
+ * @x1: origin of first rectangle
+ * @y1: origin of first rectangle
+ * @width1: width of first rectangle
+ * @height1: height of first rectangle
+ * @x2: origin of second rectangle
+ * @y2: origin of second rectangle
+ * @width2: width of second rectangle
+ * @height2: height of second rectangle
+ * @dest_x: return location for origin of intersection (may be %NULL)
+ * @dest_y: return location for origin of intersection (may be %NULL)
+ * @dest_width: return location for width of intersection (may be %NULL)
+ * @dest_height: return location for height of intersection (may be %NULL)
+ *
+ * Calculates the intersection of two rectangles.
+ *
+ * Return value: %TRUE if the intersection is non-empty, %FALSE otherwise
+ *
+ * Since: 2.4
+ **/
+gboolean
+gimp_rectangle_intersect (gint x1,
+ gint y1,
+ gint width1,
+ gint height1,
+ gint x2,
+ gint y2,
+ gint width2,
+ gint height2,
+ gint *dest_x,
+ gint *dest_y,
+ gint *dest_width,
+ gint *dest_height)
+{
+ gint d_x, d_y;
+ gint d_w, d_h;
+
+ d_x = MAX (x1, x2);
+ d_y = MAX (y1, y2);
+ d_w = MIN (x1 + width1, x2 + width2) - d_x;
+ d_h = MIN (y1 + height1, y2 + height2) - d_y;
+
+ if (dest_x) *dest_x = d_x;
+ if (dest_y) *dest_y = d_y;
+ if (dest_width) *dest_width = d_w;
+ if (dest_height) *dest_height = d_h;
+
+ return (d_w > 0 && d_h > 0);
+}
+
+/**
+ * gimp_rectangle_union:
+ * @x1: origin of first rectangle
+ * @y1: origin of first rectangle
+ * @width1: width of first rectangle
+ * @height1: height of first rectangle
+ * @x2: origin of second rectangle
+ * @y2: origin of second rectangle
+ * @width2: width of second rectangle
+ * @height2: height of second rectangle
+ * @dest_x: return location for origin of union (may be %NULL)
+ * @dest_y: return location for origin of union (may be %NULL)
+ * @dest_width: return location for width of union (may be %NULL)
+ * @dest_height: return location for height of union (may be %NULL)
+ *
+ * Calculates the union of two rectangles.
+ *
+ * Since: 2.8
+ **/
+void
+gimp_rectangle_union (gint x1,
+ gint y1,
+ gint width1,
+ gint height1,
+ gint x2,
+ gint y2,
+ gint width2,
+ gint height2,
+ gint *dest_x,
+ gint *dest_y,
+ gint *dest_width,
+ gint *dest_height)
+{
+ gint d_x, d_y;
+ gint d_w, d_h;
+
+ d_x = MIN (x1, x2);
+ d_y = MIN (y1, y2);
+ d_w = MAX (x1 + width1, x2 + width2) - d_x;
+ d_h = MAX (y1 + height1, y2 + height2) - d_y;
+
+ if (dest_x) *dest_x = d_x;
+ if (dest_y) *dest_y = d_y;
+ if (dest_width) *dest_width = d_w;
+ if (dest_height) *dest_height = d_h;
+}