Initial revision

1 files changed, 83 insertions, 0 deletions

diff --git a/gdk/gdkrectangle.c b/gdk/gdkrectangle.c
new file mode 100644
index 0000000000..dbb35b664e
--- /dev/null
+++ b/gdk/gdkrectangle.c
@@ -0,0 +1,83 @@
+/* GDK - The GIMP Drawing Kit
+ * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include "gdk.h"
+
+
+gint
+gdk_rectangle_intersect (GdkRectangle *src1,
+			 GdkRectangle *src2,
+			 GdkRectangle *dest)
+{
+  GdkRectangle *temp;
+  gint src1_x2, src1_y2;
+  gint src2_x2, src2_y2;
+  gint return_val;
+
+  g_return_val_if_fail (src1 != NULL, FALSE);
+  g_return_val_if_fail (src2 != NULL, FALSE);
+  g_return_val_if_fail (dest != NULL, FALSE);
+
+  return_val = FALSE;
+
+  if (src2->x < src1->x)
+    {
+      temp = src1;
+      src1 = src2;
+      src2 = temp;
+    }
+  dest->x = src2->x;
+
+  src1_x2 = src1->x + src1->width;
+  src2_x2 = src2->x + src2->width;
+
+  if (src2->x < src1_x2)
+    {
+      if (src1_x2 < src2_x2)
+	dest->width = src1_x2 - dest->x;
+      else
+	dest->width = src2_x2 - dest->x;
+
+      if (src2->y < src1->y)
+	{
+	  temp = src1;
+	  src1 = src2;
+	  src2 = temp;
+	}
+      dest->y = src2->y;
+
+      src1_y2 = src1->y + src1->height;
+      src2_y2 = src2->y + src2->height;
+
+      if (src2->y < src1_y2)
+	{
+	  return_val = TRUE;
+
+	  if (src1_y2 < src2_y2)
+	    dest->height = src1_y2 - dest->y;
+	  else
+	    dest->height = src2_y2 - dest->y;
+
+	  if (dest->height == 0)
+	    return_val = FALSE;
+	  if (dest->width == 0)
+	    return_val = FALSE;
+	}
+    }
+
+  return return_val;
+}