Add rectinside(), vectsubtract(), visible()

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1381 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 134 insertions, 0 deletions

diff --git a/nuttx/graphics/nxbe/nxbe_visible.c b/nuttx/graphics/nxbe/nxbe_visible.c
new file mode 100644
index 000000000..9132ebf1a
--- /dev/null
+++ b/nuttx/graphics/nxbe/nxbe_visible.c
@@ -0,0 +1,134 @@
+/****************************************************************************
+ * graphics/nxbe/nxbe_redraw.c
+ *
+ *   Copyright (C) 2008 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 <sys/types.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/nxglib.h>
+
+#include "nxbe.h"
+#include "nxfe.h"
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+struct nxbe_visible_s
+{
+  struct nxbe_clipops_s cops;
+  boolean visible;
+};
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nxbe_clipvisible
+ ****************************************************************************/
+
+static void nxbe_clipvisible(FAR struct nxbe_clipops_s *cops,
+                             FAR struct nxbe_plane_s *plane,
+                             FAR const struct nxgl_rect_s *rect)
+{
+  FAR struct nxbe_visible_s *info = (FAR struct nxbe_visible_s *)cops;
+  info->visible = TRUE;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nxbe_visible
+ *
+ * Descripton:
+ *   Return true if the point, pt, in window wnd is visible.  pt is in
+ *   absolute screen coordinates
+ *
+ ****************************************************************************/
+
+boolean nxbe_visible(FAR struct nxbe_window_s *wnd,
+                     FAR const struct nxgl_point_s *pos)
+{
+  struct nxbe_visible_s info;
+
+  /* Check if the absolute position lies within the window */
+
+  if (!nxgl_rectinside(&wnd->bounds, pos))
+    {
+      return FALSE;
+    }
+
+  /* If this is the top window, then the psition is visible */
+
+  if (!wnd->above)
+    {
+      return TRUE;
+    }
+
+  /* The position within the window range, but the window is not at
+   * the top.  We will have to work harder to determine if the point
+   * visible
+   */
+
+  info.cops.visible  = nxbe_clipvisible;
+  info.cops.obscured = nxbe_clipnull;
+  info.visible       = FALSE;
+
+  nxbe_clipper(wnd->above, &wnd->bounds, NX_CLIPORDER_DEFAULT,
+                   &info.cops, &wnd->be->plane[0]);
+
+  return info.visible;
+}