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Diffstat (limited to 'nuttx/graphics/nxbe/nxbe_visible.c')
-rw-r--r-- | nuttx/graphics/nxbe/nxbe_visible.c | 134 |
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..6b8b9291b --- /dev/null +++ b/nuttx/graphics/nxbe/nxbe_visible.c @@ -0,0 +1,134 @@ +/**************************************************************************** + * graphics/nxbe/nxbe_redraw.c + * + * Copyright (C) 2008-2009, 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 <errno.h> +#include <debug.h> + +#include <nuttx/nx/nxglib.h> + +#include "nxbe.h" +#include "nxfe.h" + +/**************************************************************************** + * Pre-Processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +struct nxbe_visible_s +{ + struct nxbe_clipops_s cops; + bool 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 + * + ****************************************************************************/ + +bool 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; +} |