/* $OpenBSD: lib_pad.c,v 1.4 1998/07/23 21:19:11 millert Exp $ */ /**************************************************************************** * Copyright (c) 1998 Free Software Foundation, Inc. * * * * Permission is hereby granted, free of charge, to any person obtaining a * * copy of this software and associated documentation files (the * * "Software"), to deal in the Software without restriction, including * * without limitation the rights to use, copy, modify, merge, publish, * * distribute, distribute with modifications, sublicense, and/or sell * * copies of the Software, and to permit persons to whom the Software is * * furnished to do so, subject to the following conditions: * * * * The above copyright notice and this permission notice shall be included * * in all copies or substantial portions of the Software. * * * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * * * Except as contained in this notice, the name(s) of the above copyright * * holders shall not be used in advertising or otherwise to promote the * * sale, use or other dealings in this Software without prior written * * authorization. * ****************************************************************************/ /**************************************************************************** * Author: Zeyd M. Ben-Halim 1992,1995 * * and: Eric S. Raymond * ****************************************************************************/ /* * lib_pad.c * newpad -- create a new pad * pnoutrefresh -- refresh a pad, no update * pechochar -- add a char to a pad and refresh */ #include MODULE_ID("$From: lib_pad.c,v 1.27 1998/06/28 00:10:16 tom Exp $") WINDOW *newpad(int l, int c) { WINDOW *win; chtype *ptr; int i; T((T_CALLED("newpad(%d, %d)"), l, c)); if (l <= 0 || c <= 0) returnWin(0); if ((win = _nc_makenew(l,c,0,0,_ISPAD)) == NULL) returnWin(0); for (i = 0; i < l; i++) { if_USE_SCROLL_HINTS(win->_line[i].oldindex = _NEWINDEX); if ((win->_line[i].text = typeCalloc(chtype, ((size_t)c))) == 0) { _nc_freewin(win); returnWin(0); } for (ptr = win->_line[i].text; ptr < win->_line[i].text + c; ) *ptr++ = ' '; } returnWin(win); } WINDOW *subpad(WINDOW *orig, int l, int c, int begy, int begx) { WINDOW *win = (WINDOW *)0; T((T_CALLED("subpad(%d, %d)"), l, c)); if (orig) { if (!(orig->_flags & _ISPAD) || ((win = derwin(orig, l, c, begy, begx)) == NULL)) returnWin(0); } returnWin(win); } int prefresh(WINDOW *win, int pminrow, int pmincol, int sminrow, int smincol, int smaxrow, int smaxcol) { T((T_CALLED("prefresh()"))); if (pnoutrefresh(win, pminrow, pmincol, sminrow, smincol, smaxrow, smaxcol) != ERR && doupdate() != ERR) { returnCode(OK); } returnCode(ERR); } int pnoutrefresh(WINDOW *win, int pminrow, int pmincol, int sminrow, int smincol, int smaxrow, int smaxcol) { const int my_len = 2; /* parameterize the threshold for hardscroll */ short i, j; short m, n; short pmaxrow; short pmaxcol; short displaced; bool wide; T((T_CALLED("pnoutrefresh(%p, %d, %d, %d, %d, %d, %d)"), win, pminrow, pmincol, sminrow, smincol, smaxrow, smaxcol)); if (win == 0) returnCode(ERR); if (!(win->_flags & _ISPAD)) returnCode(ERR); /* negative values are interpreted as zero */ if (pminrow < 0) pminrow = 0; if (pmincol < 0) pmincol = 0; if (sminrow < 0) sminrow = 0; if (smincol < 0) smincol = 0; pmaxrow = pminrow + smaxrow - sminrow; pmaxcol = pmincol + smaxcol - smincol; T((" pminrow + smaxrow - sminrow %d, win->_maxy %d", pmaxrow, win->_maxy)); T((" pmincol + smaxcol - smincol %d, win->_maxx %d", pmaxcol, win->_maxx)); /* * Trim the caller's screen size back to the actual limits. */ if (pmaxrow > win->_maxy) { smaxrow -= (pmaxrow - win->_maxy); pmaxrow = pminrow + smaxrow - sminrow; } if (pmaxcol > win->_maxx) { smaxcol -= (pmaxcol - win->_maxx); pmaxcol = pmincol + smaxcol - smincol; } if (smaxrow > screen_lines || smaxcol > screen_columns || sminrow > smaxrow || smincol > smaxcol) returnCode(ERR); T(("pad being refreshed")); if (win->_pad._pad_y >= 0) { displaced = pminrow - win->_pad._pad_y -(sminrow - win->_pad._pad_top); T(("pad being shifted by %d line(s)", displaced)); } else displaced = 0; /* * For pure efficiency, we'd want to transfer scrolling information * from the pad to newscr whenever the window is wide enough that * its update will dominate the cost of the update for the horizontal * band of newscr that it occupies. Unfortunately, this threshold * tends to be complex to estimate, and in any case scrolling the * whole band and rewriting the parts outside win's image would look * really ugly. So. What we do is consider the pad "wide" if it * either (a) occupies the whole width of newscr, or (b) occupies * all but at most one column on either vertical edge of the screen * (this caters to fussy people who put boxes around full-screen * windows). Note that changing this formula will not break any code, * merely change the costs of various update cases. */ wide = (smincol < my_len && smaxcol > (newscr->_maxx - my_len)); for (i = pminrow, m = sminrow + win->_yoffset; i <= pmaxrow && m <= newscr->_maxy; i++, m++) { register struct ldat *nline = &newscr->_line[m]; register struct ldat *oline = &win->_line[i]; for (j = pmincol, n = smincol; j <= pmaxcol; j++, n++) { if (oline->text[j] != nline->text[n]) { nline->text[n] = oline->text[j]; CHANGED_CELL(nline,n); } } #if USE_SCROLL_HINTS if (wide) { int nind = m + displaced; if (oline->oldindex < 0 || nind < sminrow || nind > smaxrow) { nind = _NEWINDEX; } else if (displaced) { register struct ldat *pline = &curscr->_line[nind]; for (j = 0; j <= my_len; j++) { int k = newscr->_maxx - j; if (pline->text[j] != nline->text[j] || pline->text[k] != nline->text[k]) { nind = _NEWINDEX; break; } } } nline->oldindex = nind; } #endif /* USE_SCROLL_HINTS */ oline->firstchar = oline->lastchar = _NOCHANGE; if_USE_SCROLL_HINTS(oline->oldindex = i); } /* * Clean up debris from scrolling or resizing the pad, so we do not * accidentally pick up the index value during the next call to this * procedure. The only rows that should have an index value are those * that are displayed during this cycle. */ #if USE_SCROLL_HINTS for (i = pminrow-1; (i >= 0) && (win->_line[i].oldindex >= 0); i--) win->_line[i].oldindex = _NEWINDEX; for (i = pmaxrow+1; (i <= win->_maxy) && (win->_line[i].oldindex >= 0); i++) win->_line[i].oldindex = _NEWINDEX; #endif win->_begx = smincol; win->_begy = sminrow; if (win->_clear) { win->_clear = FALSE; newscr->_clear = TRUE; } /* * Use the pad's current position, if it will be visible. * If not, don't do anything; it's not an error. */ if (win->_leaveok == FALSE && win->_cury >= pminrow && win->_curx >= pmincol && win->_cury <= pmaxrow && win->_curx <= pmaxcol) { newscr->_cury = win->_cury - pminrow + win->_begy + win->_yoffset; newscr->_curx = win->_curx - pmincol + win->_begx; } win->_flags &= ~_HASMOVED; /* * Update our cache of the line-numbers that we displayed from the pad. * We will use this on subsequent calls to this function to derive * values to stuff into 'oldindex[]' -- for scrolling optimization. */ win->_pad._pad_y = pminrow; win->_pad._pad_x = pmincol; win->_pad._pad_top = sminrow; win->_pad._pad_left = smincol; win->_pad._pad_bottom = smaxrow; win->_pad._pad_right = smaxcol; returnCode(OK); } int pechochar(WINDOW *pad, const chtype ch) { T((T_CALLED("pechochar(%p, %s)"), pad, _tracechtype(ch))); if (pad == 0) returnCode(ERR); if (!(pad->_flags & _ISPAD)) returnCode(wechochar(pad,ch)); waddch(pad, ch); prefresh(pad, pad->_pad._pad_y, pad->_pad._pad_x, pad->_pad._pad_top, pad->_pad._pad_left, pad->_pad._pad_bottom, pad->_pad._pad_right); returnCode(OK); }