130 lines
4.4 KiB
C
130 lines
4.4 KiB
C
/****************************************************************************
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* graphics/nxbe/nxbe_isvisible.c
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*
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* Copyright (C) 2008-2009, 2011, 2019 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/nx/nxglib.h>
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#include "nxbe.h"
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#include "nxmu.h"
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct nxbe_setvisibility_s
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{
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struct nxbe_clipops_s cops;
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bool visible;
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxbe_clipvisible
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****************************************************************************/
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static void nxbe_clipvisible(FAR struct nxbe_clipops_s *cops,
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FAR struct nxbe_plane_s *plane,
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FAR const struct nxgl_rect_s *rect)
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{
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FAR struct nxbe_setvisibility_s *info = (FAR struct nxbe_setvisibility_s *)cops;
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info->visible = true;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxbe_isvisible
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*
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* Description:
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* Return true if the point, pt, in window wnd is visible. pt is in
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* absolute screen coordinates
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*
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****************************************************************************/
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bool nxbe_isvisible(FAR struct nxbe_window_s *wnd,
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FAR const struct nxgl_point_s *pos)
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{
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struct nxbe_setvisibility_s info;
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/* Hidden windows are never visible */
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if (NXBE_ISHIDDEN(wnd))
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{
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return false;
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}
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/* Check if the absolute position lies within the window */
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if (!nxgl_rectinside(&wnd->bounds, pos))
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{
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return false;
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}
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/* If this is the top window, then the position is visible */
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if (!wnd->above)
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{
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return true;
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}
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/* The position within the window range, but the window is not at
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* the top. We will have to work harder to determine if the point
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* visible
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*/
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info.cops.visible = nxbe_clipvisible;
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info.cops.obscured = nxbe_clipnull;
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info.visible = false;
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nxbe_clipper(wnd->above, &wnd->bounds, NX_CLIPORDER_DEFAULT,
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&info.cops, &wnd->be->plane[0]);
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return info.visible;
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}
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