272 lines
6.8 KiB
C
272 lines
6.8 KiB
C
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Edward Wang at The University of California, Berkeley.
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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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* 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 the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be 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 REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)wwupdate.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#include "ww.h"
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#include "tt.h"
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wwupdate1(top, bot)
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{
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int i;
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register j;
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char *touched;
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struct ww_update *upd;
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char check_clreos = 0;
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int scan_top, scan_bot;
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wwnupdate++;
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{
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register char *t1 = wwtouched + top, *t2 = wwtouched + bot;
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register n;
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while (!*t1++)
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if (t1 == t2)
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return;
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while (!*--t2)
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;
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scan_top = top = t1 - wwtouched - 1;
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scan_bot = bot = t2 - wwtouched + 1;
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if (scan_bot - scan_top > 1 &&
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(tt.tt_clreos != 0 || tt.tt_clear != 0)) {
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int st = tt.tt_clreos != 0 ? scan_top : 0;
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/*
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* t1 is one past the first touched row,
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* t2 is on the last touched row.
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*/
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for (t1--, n = 1; t1 < t2;)
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if (*t1++)
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n++;
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/*
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* If we can't clreos then we try for clearing
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* the whole screen.
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*/
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if (check_clreos = n * 10 > (wwnrow - st) * 9) {
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scan_top = st;
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scan_bot = wwnrow;
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}
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}
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}
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if (tt.tt_clreol == 0 && !check_clreos)
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goto simple;
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for (i = scan_top, touched = &wwtouched[i], upd = &wwupd[i];
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i < scan_bot;
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i++, touched++, upd++) {
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register gain = 0;
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register best_gain = 0;
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register best_col;
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register union ww_char *ns, *os;
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if (wwinterrupt())
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return;
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if (!check_clreos && !*touched)
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continue;
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wwnupdscan++;
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j = wwncol;
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ns = &wwns[i][j];
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os = &wwos[i][j];
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while (--j >= 0) {
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/*
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* The cost of clearing is:
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* ncol - nblank + X
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* The cost of straight update is, more or less:
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* ncol - nsame
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* We clear if nblank - nsame > X
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* X is the clreol overhead.
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* So we make gain = nblank - nsame.
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*/
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if ((--ns)->c_w == (--os)->c_w)
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gain--;
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else
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best_gain--;
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if (ns->c_w == ' ')
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gain++;
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if (gain > best_gain) {
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best_col = j;
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best_gain = gain;
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}
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}
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upd->best_gain = best_gain;
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upd->best_col = best_col;
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upd->gain = gain;
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}
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if (check_clreos) {
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register struct ww_update *u;
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register gain = 0;
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register best_gain = 0;
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int best_row;
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register simple_gain = 0;
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char didit = 0;
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/*
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* gain is the advantage of clearing all the lines.
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* best_gain is the advantage of clearing to eos
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* at best_row and u->best_col.
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* simple_gain is the advantage of using only clreol.
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* We use g > best_gain because u->best_col can be
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* undefined when u->best_gain is 0 so we can't use it.
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*/
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for (j = scan_bot - 1, u = wwupd + j; j >= top; j--, u--) {
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register g = gain + u->best_gain;
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if (g > best_gain) {
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best_gain = g;
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best_row = j;
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}
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gain += u->gain;
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if (tt.tt_clreol != 0 && u->best_gain > 4)
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simple_gain += u->best_gain - 4;
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}
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if (tt.tt_clreos == 0) {
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if (gain > simple_gain && gain > 4) {
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xxclear();
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i = top = scan_top;
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bot = scan_bot;
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j = 0;
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didit = 1;
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}
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} else
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if (best_gain > simple_gain && best_gain > 4) {
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i = best_row;
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xxclreos(i, j = wwupd[i].best_col);
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bot = scan_bot;
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didit = 1;
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}
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if (didit) {
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wwnupdclreos++;
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wwnupdclreosline += wwnrow - i;
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u = wwupd + i;
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while (i < scan_bot) {
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register union ww_char *os = &wwos[i][j];
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for (j = wwncol - j; --j >= 0;)
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os++->c_w = ' ';
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wwtouched[i++] |= WWU_TOUCHED;
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u++->best_gain = 0;
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j = 0;
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}
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} else
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wwnupdclreosmiss++;
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}
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simple:
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for (i = top, touched = &wwtouched[i], upd = &wwupd[i]; i < bot;
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i++, touched++, upd++) {
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register union ww_char *os, *ns;
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char didit;
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if (!*touched)
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continue;
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*touched = 0;
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wwnupdline++;
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didit = 0;
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if (tt.tt_clreol != 0 && upd->best_gain > 4) {
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wwnupdclreol++;
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xxclreol(i, j = upd->best_col);
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for (os = &wwos[i][j], j = wwncol - j; --j >= 0;)
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os++->c_w = ' ';
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didit = 1;
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}
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ns = wwns[i];
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os = wwos[i];
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for (j = 0; j < wwncol;) {
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register char *p, *q;
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char m;
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int c;
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register n;
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char buf[512]; /* > wwncol */
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union ww_char lastc;
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for (; j++ < wwncol && ns++->c_w == os++->c_w;)
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;
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if (j > wwncol)
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break;
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p = buf;
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m = ns[-1].c_m;
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c = j - 1;
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os[-1] = ns[-1];
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*p++ = ns[-1].c_c;
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n = 5;
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q = p;
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while (j < wwncol && ns->c_m == m) {
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*p++ = ns->c_c;
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if (ns->c_w == os->c_w) {
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if (--n <= 0)
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break;
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os++;
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ns++;
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} else {
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n = 5;
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q = p;
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lastc = *os;
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*os++ = *ns++;
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}
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j++;
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}
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n = q - buf;
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if (!wwwrap || i != wwnrow - 1 || c + n != wwncol)
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xxwrite(i, c, buf, n, m);
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else if (tt.tt_inschar || tt.tt_insspace) {
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if (n > 1) {
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q[-2] = q[-1];
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n--;
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} else
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c--;
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xxwrite(i, c, buf, n, m);
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c += n - 1;
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if (tt.tt_inschar)
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xxinschar(i, c, ns[-2].c_c,
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ns[-2].c_m);
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else {
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xxinsspace(i, c);
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xxwrite(i, c, &ns[-2].c_c, 1,
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ns[-2].c_m);
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}
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} else {
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if (--n)
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xxwrite(i, c, buf, n, m);
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os[-1] = lastc;
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*touched = WWU_TOUCHED;
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}
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didit = 1;
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}
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if (!didit)
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wwnupdmiss++;
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}
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}
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