118 lines
4.7 KiB
C
118 lines
4.7 KiB
C
/****************************************************************************
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* libnx/nxtk/nxtk_subwindowclip.c
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*
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* Copyright (C) 2008-2009, 2013 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 <stdlib.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/nx/nx.h>
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#include <nuttx/nx/nxtk.h>
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#include "nxtk.h"
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/****************************************************************************
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* Pre-Processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Data
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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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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxtk_subwindowclip
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*
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* Description:
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* We are given a 'src' rectangle in sub-window, relative coordinates
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* (i.e., (0,0) is the top left corner of the sub-window). This function
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* will (1) clip that src rectangle so that it lies within the sub-window
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* bounds, and then (2) move the rectangle to that it is relative to the
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* containing window (i.e., (0,0) is the top left corner of the containing
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* window).
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*
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* Input parameters:
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* fwnd - The framed window to be used
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* dest - The locaton to put the result
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* src - The src rectangle in relative sub-window coordinates
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* bounds - The subwindow bounds in absolute screen coordinates.
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*
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* Returned value:
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* None
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*
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****************************************************************************/
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void nxtk_subwindowclip(FAR struct nxtk_framedwindow_s *fwnd,
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FAR struct nxgl_rect_s *dest,
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FAR const struct nxgl_rect_s *src,
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FAR const struct nxgl_rect_s *bounds)
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{
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struct nxgl_rect_s tmp;
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/* Temporarily, position the src rectangle in absolute screen coordinates */
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nxgl_rectoffset(&tmp, src, bounds->pt1.x, bounds->pt1.y);
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/* Clip the src rectangle to lie within the client window region */
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nxgl_rectintersect(&tmp, &tmp, bounds);
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/* Then move the rectangle so that is relative to the containing window, not the
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* client subwindow
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*/
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nxgl_rectoffset(dest, &tmp, -fwnd->wnd.bounds.pt1.x, -fwnd->wnd.bounds.pt1.y);
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}
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