88 lines
3.2 KiB
C
88 lines
3.2 KiB
C
/****************************************************************************
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* libs/libnx/nxtk/nxtk_containerclip.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxtk_containerclip
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*
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* Description:
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* We are given a 'src' rectangle in containing window, relative
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* coordinates (i.e., (0,0) is the top left corner of the outer, containing
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* window).
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* This function will (1) clip that src rectangle so that it lies within
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* the sub-window bounds, and then (2) move the rectangle to that it is
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* relative to the sub-window (i.e., (0,0) is the top left corner of the
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* sub-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 container-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_containerclip(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 relbounds;
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/* The 'src' rectangle is relative to the containing window. Convert
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* the sub-window to the same origin.
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*/
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nxgl_rectoffset(&relbounds, bounds, -fwnd->wnd.bounds.pt1.x,
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-fwnd->wnd.bounds.pt1.y);
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/* The interection then leaves the portion of the containing window that
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* needs to be updated window that needs to be updated.
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*/
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nxgl_rectintersect(dest, src, &relbounds);
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/* Offset this so that is relative to client subwindow origin */
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nxgl_rectoffset(dest, dest, fwnd->wnd.bounds.pt1.x - bounds->pt1.x,
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fwnd->wnd.bounds.pt1.y - bounds->pt1.y);
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}
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