1 files changed, 90 insertions, 0 deletions
diff --git a/nuttx/graphics/nxglib/nxglib_rectoverlap.c b/nuttx/graphics/nxglib/nxglib_rectoverlap.c
new file mode 100644
index 000000000..75d7a4641
--- /dev/null
+++ b/nuttx/graphics/nxglib/nxglib_rectoverlap.c
@@ -0,0 +1,90 @@
+/****************************************************************************
+ * graphics/nxglib/nxsglib_nulloverlap.c
+ *
+ *   Copyright (C) 2008-2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+
+#include <nuttx/nx/nxglib.h>
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nxgl_rectoverlap
+ *
+ * Description:
+ *   Return true if the two rectangles overlap
+ *
+ ****************************************************************************/
+
+bool nxgl_rectoverlap(FAR struct nxgl_rect_s *rect1,
+                      FAR struct nxgl_rect_s *rect2)
+{
+  /* The neither is wholly above, below, right, or left of the other, then
+   * the two rectangles overlap in some fashion.
+   */
+
+  return (rect1->pt1.x <= rect2->pt2.x) &&  /* false: rect1 is wholly to the right */
+         (rect2->pt1.x <= rect1->pt2.x) &&  /* false: rect2 is wholly to the right */
+         (rect1->pt1.y <= rect2->pt2.y) &&  /* false: rect1 is wholly below rect2 */
+         (rect2->pt1.y <= rect1->pt2.y);    /* false: rect2 is wholly below rect1 */
+}
+