diff options
Diffstat (limited to 'nuttx/graphics/nxtk/nxtk_subwindowclip.c')
-rw-r--r-- | nuttx/graphics/nxtk/nxtk_subwindowclip.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/nuttx/graphics/nxtk/nxtk_subwindowclip.c b/nuttx/graphics/nxtk/nxtk_subwindowclip.c new file mode 100644 index 000000000..4d453eeca --- /dev/null +++ b/nuttx/graphics/nxtk/nxtk_subwindowclip.c @@ -0,0 +1,118 @@ +/**************************************************************************** + * graphics/nxtk/nxtk_subwindowclip.c + * + * Copyright (C) 2008-2009 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 <stdlib.h> +#include <errno.h> +#include <debug.h> + +#include <nuttx/nx/nx.h> +#include <nuttx/nx/nxtk.h> + +#include "nxfe.h" +#include "nxtk_internal.h" + +/**************************************************************************** + * Pre-Processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: nxtk_subwindowclip + * + * Description: + * We are given a 'src' rectangle in sub-window, relative coordinates + * (i.e., (0,0) is the top left corner of the sub-window). This function + * will (1) clip that src rectangle so that it lies within the sub-window + * bounds, and then (2) move the rectangle to that it is relative to the + * containing window (i.e., (0,0) is the top left corner of the containing + * window). + * + * Input parameters: + * fwnd - The framed window to be used + * dest - The locaton to put the result + * src - The src rectangle in relative sub-window coordinates + * bounds - The subwindow bounds in absolute screen coordinates. + * + * Returned value: + * None + * + ****************************************************************************/ + +void nxtk_subwindowclip(FAR struct nxtk_framedwindow_s *fwnd, + FAR struct nxgl_rect_s *dest, + FAR const struct nxgl_rect_s *src, + FAR const struct nxgl_rect_s *bounds) +{ + struct nxgl_rect_s tmp; + + /* Temporarily, position the src rectangle in absolute screen coordinates */ + + nxgl_rectoffset(&tmp, src, bounds->pt1.x, bounds->pt1.y); + + /* Clip the src rectangle to lie within the client window region */ + + nxgl_rectintersect(&tmp, &tmp, bounds); + + /* Then move the rectangle so that is relative to the containing window, not the + * client subwindow + */ + + nxgl_rectoffset(dest, &tmp, -fwnd->wnd.bounds.pt1.x, -fwnd->wnd.bounds.pt1.y); +} |