358 lines
9.9 KiB
C
358 lines
9.9 KiB
C
/****************************************************************************
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* apps/graphics/pdcurses/pdc_refresh.c
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* Public Domain Curses
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* RCSID("$Id: refresh.c,v 1.56 2008/07/13 16:08:18 wmcbrine Exp $")
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*
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* Copyright (C) 2017 Gregory Nutt. All rights reserved.
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* Adapted by: Gregory Nutt <gnutt@nuttx.org>
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*
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* Adapted from the original public domain pdcurses by Gregory Nutt and
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* released as part of NuttX under the 3-clause BSD license:
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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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/* Name: refresh
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*
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* Synopsis:
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* int refresh(void);
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* int wrefresh(WINDOW *win);
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* int wnoutrefresh(WINDOW *win);
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* int doupdate(void);
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* int redrawwin(WINDOW *win);
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* int wredrawln(WINDOW *win, int beg_line, int num_lines);
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*
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* Description:
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* wrefresh() copies the named window to the physical terminal
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* screen, taking into account what is already there in order to
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* optimize cursor movement. refresh() does the same, using stdscr.
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* These routines must be called to get any output on the terminal,
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* as other routines only manipulate data structures. Unless
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* leaveok() has been enabled, the physical cursor of the terminal
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* is left at the location of the window's cursor.
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*
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* wnoutrefresh() and doupdate() allow multiple updates with more
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* efficiency than wrefresh() alone. wrefresh() works by first
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* calling wnoutrefresh(), which copies the named window to the
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* virtual screen. It then calls doupdate(), which compares the
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* virtual screen to the physical screen and does the actual
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* update. A series of calls to wrefresh() will result in
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* alternating calls to wnoutrefresh() and doupdate(), causing
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* several bursts of output to the screen. By first calling
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* wnoutrefresh() for each window, it is then possible to call
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* doupdate() only once.
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*
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* In PDCurses, redrawwin() is equivalent to touchwin(), and
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* wredrawln() is the same as touchline(). In some other curses
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* implementations, there's a subtle distinction, but it has no
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* meaning in PDCurses.
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*
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* Return Value:
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* All functions return OK on success and ERR on error.
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*
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* Portability X/Open BSD SYS V
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* refresh Y Y Y
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* wrefresh Y Y Y
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* wnoutrefresh Y Y Y
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* doupdate Y Y Y
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* redrawwin Y - 4.0
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* wredrawln Y - 4.0
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*/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <string.h>
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#include "curspriv.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int wnoutrefresh(WINDOW *win)
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{
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int begx;
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int begy;
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int i;
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int j;
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PDC_LOG(("wnoutrefresh() - called: win=%p\n", win));
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if (!win || (win->_flags & (_PAD | _SUBPAD)))
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{
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return ERR;
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}
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begy = win->_begy;
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begx = win->_begx;
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for (i = 0, j = begy; i < win->_maxy; i++, j++)
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{
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if (win->_firstch[i] != _NO_CHANGE)
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{
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chtype *src = win->_y[i];
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chtype *dest = curscr->_y[j] + begx;
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int first = win->_firstch[i]; /* first changed */
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int last = win->_lastch[i]; /* last changed */
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/* Ignore areas on the outside that are marked as changed, but
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* really aren't.
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*/
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while (first <= last && src[first] == dest[first])
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{
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first++;
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}
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while (last >= first && src[last] == dest[last])
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{
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last--;
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}
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/* If any have really changed... */
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if (first <= last)
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{
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memcpy(dest + first, src + first,
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(last - first + 1) * sizeof(chtype));
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first += begx;
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last += begx;
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if (first < curscr->_firstch[j] ||
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curscr->_firstch[j] == _NO_CHANGE)
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{
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curscr->_firstch[j] = first;
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}
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if (last > curscr->_lastch[j])
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{
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curscr->_lastch[j] = last;
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}
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}
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win->_firstch[i] = _NO_CHANGE; /* updated now */
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}
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win->_lastch[i] = _NO_CHANGE; /* updated now */
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}
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if (win->_clear)
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{
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win->_clear = false;
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}
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if (!win->_leaveit)
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{
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curscr->_cury = win->_cury + begy;
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curscr->_curx = win->_curx + begx;
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}
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return OK;
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}
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int doupdate(void)
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{
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int y;
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bool clearall;
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PDC_LOG(("doupdate() - called\n"));
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if (!curscr)
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{
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return ERR;
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}
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if (isendwin()) /* coming back after endwin() called */
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{
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reset_prog_mode();
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clearall = true;
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SP->alive = true; /* so isendwin() result is correct */
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}
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else
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{
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clearall = curscr->_clear;
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}
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for (y = 0; y < SP->lines; y++)
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{
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PDC_LOG(("doupdate() - Transforming line %d of %d: %s\n",
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y, SP->lines, (curscr->_firstch[y] != _NO_CHANGE) ?
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"Yes" : "No"));
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if (clearall || curscr->_firstch[y] != _NO_CHANGE)
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{
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int first;
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int last;
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chtype *src = curscr->_y[y];
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chtype *dest = pdc_lastscr->_y[y];
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if (clearall)
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{
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first = 0;
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last = COLS - 1;
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}
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else
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{
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first = curscr->_firstch[y];
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last = curscr->_lastch[y];
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}
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while (first <= last)
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{
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int len = 0;
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/* Build up a run of changed cells; if two runs are separated by
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* a single unchanged cell, ignore the break.
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*/
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if (clearall)
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{
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len = last - first + 1;
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}
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else
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{
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while (first + len <= last &&
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(src[first + len] != dest[first + len] ||
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(len && first + len < last &&
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src[first + len + 1] != dest[first + len + 1])))
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{
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len++;
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}
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}
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/* Update the screen, and pdc_lastscr */
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if (len)
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{
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PDC_transform_line(y, first, len, src + first);
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memcpy(dest + first, src + first, len * sizeof(chtype));
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first += len;
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}
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/* skip over runs of unchanged cells */
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while (first <= last && src[first] == dest[first])
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{
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first++;
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}
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}
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curscr->_firstch[y] = _NO_CHANGE;
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curscr->_lastch[y] = _NO_CHANGE;
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}
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}
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curscr->_clear = false;
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if (SP->visibility)
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{
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PDC_gotoyx(curscr->_cury, curscr->_curx);
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}
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SP->cursrow = curscr->_cury;
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SP->curscol = curscr->_curx;
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return OK;
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}
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int wrefresh(WINDOW *win)
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{
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bool save_clear;
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PDC_LOG(("wrefresh() - called\n"));
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if (!win || (win->_flags & (_PAD | _SUBPAD)))
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{
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return ERR;
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}
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save_clear = win->_clear;
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if (win == curscr)
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{
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curscr->_clear = true;
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}
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else
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{
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wnoutrefresh(win);
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}
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if (save_clear && win->_maxy == SP->lines && win->_maxx == SP->cols)
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{
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curscr->_clear = true;
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}
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return doupdate();
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}
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int refresh(void)
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{
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PDC_LOG(("refresh() - called\n"));
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return wrefresh(stdscr);
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}
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int wredrawln(WINDOW *win, int start, int num)
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{
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int i;
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PDC_LOG(("wredrawln() - called: win=%p start=%d num=%d\n",
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win, start, num));
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if (!win || start > win->_maxy || start + num > win->_maxy)
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{
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return ERR;
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}
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for (i = start; i < start + num; i++)
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{
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win->_firstch[i] = 0;
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win->_lastch[i] = win->_maxx - 1;
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}
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return OK;
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}
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int redrawwin(WINDOW *win)
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{
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PDC_LOG(("redrawwin() - called: win=%p\n", win));
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if (!win)
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{
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return ERR;
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}
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return wredrawln(win, 0, win->_maxy);
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}
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