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NetBSD/lib/libcurses/refresh.c

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/* $NetBSD: refresh.c,v 1.48 2002/10/22 11:37:34 blymn Exp $ */
/*
* Copyright (c) 1981, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)refresh.c 8.7 (Berkeley) 8/13/94";
#else
__RCSID("$NetBSD: refresh.c,v 1.48 2002/10/22 11:37:34 blymn Exp $");
#endif
#endif /* not lint */
#include <stdlib.h>
#include <string.h>
#include "curses.h"
#include "curses_private.h"
static void domvcur __P((int, int, int, int));
static int makech __P((int));
static void quickch __P((void));
static void scrolln __P((int, int, int, int, int));
#ifndef _CURSES_USE_MACROS
/*
* refresh --
* Make the current screen look like "stdscr" over the area covered by
* stdscr.
*/
int
refresh(void)
{
return wrefresh(stdscr);
}
#endif
/*
* wnoutrefresh --
* Add the contents of "win" to the virtual window.
*/
int
wnoutrefresh(WINDOW *win)
{
return _cursesi_wnoutrefresh(_cursesi_screen, win);
}
/*
* _cursesi_wnoutrefresh --
* Does the grunt work for wnoutrefresh to the given screen.
*
*/
int
_cursesi_wnoutrefresh(SCREEN *screen, WINDOW *win)
{
short wy, wx, x_off;
__LINE *wlp, *vlp;
#ifdef DEBUG
__CTRACE("wnoutrefresh: win %0.2o, flags 0x%08x\n", win, win->flags);
#endif
if (screen->curwin)
return(OK);
screen->__virtscr->cury = win->cury + win->begy;
screen->__virtscr->curx = win->curx + win->begx;
/* Copy the window flags from "win" to "__virtscr" */
if (win->flags & __CLEAROK) {
if (win->flags & __FULLWIN)
screen->__virtscr->flags |= __CLEAROK;
win->flags &= ~__CLEAROK;
}
screen->__virtscr->flags &= ~__LEAVEOK;
screen->__virtscr->flags |= win->flags;
for (wy = 0; wy < win->maxy && wy < screen->__virtscr->maxy - win->begy; wy++) {
wlp = win->lines[wy];
#ifdef DEBUG
__CTRACE("wnoutrefresh: wy %d\tf: %d\tl:%d\tflags %x\n", wy,
*wlp->firstchp, *wlp->lastchp, wlp->flags);
#endif
if ((wlp->flags & __ISDIRTY) == 0)
continue;
vlp = screen->__virtscr->lines[wy + win->begy];
if (*wlp->firstchp < win->maxx + win->ch_off &&
*wlp->lastchp >= win->ch_off) {
/* Copy line from "win" to "__virtscr". */
for (wx = 0, x_off = win->begx; wx < win->maxx &&
x_off < screen->__virtscr->maxx; wx++, x_off++) {
vlp->line[x_off].attr = wlp->line[wx].attr;
if (wlp->line[wx].attr & __COLOR)
vlp->line[x_off].attr |=
wlp->line[wx].battr & ~__COLOR;
else
vlp->line[x_off].attr |=
wlp->line[wx].battr;
if (wlp->line[wx].ch == ' ' &&
wlp->line[wx].bch != ' ')
vlp->line[x_off].ch
= wlp->line[wx].bch;
else
vlp->line[x_off].ch
= wlp->line[wx].ch;
}
/* Set flags on "__virtscr" and unset on "win". */
if (wlp->flags & __ISPASTEOL)
vlp->flags |= __ISPASTEOL;
else
vlp->flags &= ~__ISPASTEOL;
if (wlp->flags & __ISDIRTY)
vlp->flags |= __ISDIRTY;
#ifdef DEBUG
__CTRACE("win: firstch = %d, lastch = %d\n",
*wlp->firstchp, *wlp->lastchp);
#endif
/* Set change pointers on "__virtscr". */
if (*vlp->firstchp >
*wlp->firstchp + win->begx - win->ch_off)
*vlp->firstchp =
*wlp->firstchp + win->begx - win->ch_off;
if (*vlp->lastchp <
*wlp->lastchp + win->begx - win->ch_off)
*vlp->lastchp =
*wlp->lastchp + win->begx - win->ch_off;
#ifdef DEBUG
__CTRACE("__virtscr: firstch = %d, lastch = %d\n",
*vlp->firstchp, *vlp->lastchp);
#endif
/* Set change pointers on "win". */
if (*wlp->firstchp >= win->ch_off)
*wlp->firstchp = win->maxx + win->ch_off;
if (*wlp->lastchp < win->maxx + win->ch_off)
*wlp->lastchp = win->ch_off;
if (*wlp->lastchp < *wlp->firstchp) {
#ifdef DEBUG
__CTRACE("wnoutrefresh: line %d notdirty\n",
wy);
#endif
wlp->flags &= ~__ISDIRTY;
}
}
}
return (OK);
}
/*
* wrefresh --
* Make the current screen look like "win" over the area coverd by
* win.
*/
int
wrefresh(WINDOW *win)
{
int retval;
_cursesi_screen->curwin = (win == _cursesi_screen->curscr);
if (!_cursesi_screen->curwin)
retval = _cursesi_wnoutrefresh(_cursesi_screen, win);
else
retval = OK;
if (retval == OK) {
retval = doupdate();
if (!win->flags & __LEAVEOK) {
win->cury = max(0, curscr->cury - win->begy);
win->curx = max(0, curscr->curx - win->begx);
}
}
_cursesi_screen->curwin = 0;
return(retval);
}
/*
* doupdate --
* Make the current screen look like the virtual window "__virtscr".
*/
int
doupdate(void)
{
WINDOW *win;
__LINE *wlp;
short wy;
int dnum;
/* Check if we need to restart ... */
if (_cursesi_screen->endwin)
__restartwin();
if (_cursesi_screen->curwin)
win = curscr;
else
win = _cursesi_screen->__virtscr;
/* Initialize loop parameters. */
_cursesi_screen->ly = curscr->cury;
_cursesi_screen->lx = curscr->curx;
wy = 0;
if (!_cursesi_screen->curwin)
for (wy = 0; wy < win->maxy; wy++) {
wlp = win->lines[wy];
if (wlp->flags & __ISDIRTY)
wlp->hash = __hash((char *)(void *)wlp->line,
(size_t) (win->maxx * __LDATASIZE));
}
if ((win->flags & __CLEAROK) || (curscr->flags & __CLEAROK) ||
_cursesi_screen->curwin) {
if (curscr->wattr & __COLOR)
__unsetattr(0);
tputs(__tc_cl, 0, __cputchar);
_cursesi_screen->ly = 0;
_cursesi_screen->lx = 0;
if (!_cursesi_screen->curwin) {
curscr->flags &= ~__CLEAROK;
curscr->cury = 0;
curscr->curx = 0;
werase(curscr);
}
__touchwin(win);
win->flags &= ~__CLEAROK;
}
if (!__CA) {
if (win->curx != 0)
__cputchar('\n');
if (!_cursesi_screen->curwin)
werase(curscr);
}
#ifdef DEBUG
__CTRACE("doupdate: (%0.2o): curwin = %d\n", win,
_cursesi_screen->curwin);
__CTRACE("doupdate: \tfirstch\tlastch\n");
#endif
if (!_cursesi_screen->curwin) {
/*
* Invoke quickch() only if more than a quarter of the lines
* in the window are dirty.
*/
for (wy = 0, dnum = 0; wy < win->maxy; wy++)
if (win->lines[wy]->flags & __ISDIRTY)
dnum++;
if (!__noqch && dnum > (int) win->maxy / 4)
quickch();
}
#ifdef DEBUG
{
int i, j;
__CTRACE("#####################################\n");
for (i = 0; i < curscr->maxy; i++) {
__CTRACE("C: %d:", i);
__CTRACE(" 0x%x \n", curscr->lines[i]->hash);
for (j = 0; j < curscr->maxx; j++)
__CTRACE("%c", curscr->lines[i]->line[j].ch);
__CTRACE("\n");
__CTRACE(" attr:");
for (j = 0; j < curscr->maxx; j++)
__CTRACE(" %x",
curscr->lines[i]->line[j].attr);
__CTRACE("\n");
__CTRACE("W: %d:", i);
__CTRACE(" 0x%x \n", win->lines[i]->hash);
__CTRACE(" 0x%x ", win->lines[i]->flags);
for (j = 0; j < win->maxx; j++)
__CTRACE("%c", win->lines[i]->line[j].ch);
__CTRACE("\n");
__CTRACE(" attr:");
for (j = 0; j < win->maxx; j++)
__CTRACE(" %x",
win->lines[i]->line[j].attr);
__CTRACE("\n");
}
}
#endif /* DEBUG */
for (wy = 0; wy < win->maxy; wy++) {
wlp = win->lines[wy];
/* XXX: remove this debug */
#ifdef DEBUG
__CTRACE("doupdate: wy %d\tf: %d\tl:%d\tflags %x\n", wy,
*wlp->firstchp, *wlp->lastchp, wlp->flags);
#endif
if (!_cursesi_screen->curwin)
curscr->lines[wy]->hash = wlp->hash;
if (wlp->flags & __ISDIRTY) {
if (makech(wy) == ERR)
return (ERR);
else {
if (*wlp->firstchp >= 0)
*wlp->firstchp = win->maxx;
if (*wlp->lastchp < win->maxx)
*wlp->lastchp = 0;
if (*wlp->lastchp < *wlp->firstchp) {
#ifdef DEBUG
__CTRACE("doupdate: line %d notdirty\n", wy);
#endif
wlp->flags &= ~__ISDIRTY;
}
}
}
#ifdef DEBUG
__CTRACE("\t%d\t%d\n", *wlp->firstchp, *wlp->lastchp);
#endif
}
#ifdef DEBUG
__CTRACE("doupdate: ly=%d, lx=%d\n", _cursesi_screen->ly,
_cursesi_screen->lx);
#endif
if (_cursesi_screen->curwin)
domvcur(_cursesi_screen->ly, _cursesi_screen->lx,
(int) win->cury, (int) win->curx);
else {
if (win->flags & __LEAVEOK) {
curscr->cury = _cursesi_screen->ly;
curscr->curx = _cursesi_screen->lx;
} else {
domvcur(_cursesi_screen->ly, _cursesi_screen->lx,
win->cury, win->curx);
curscr->cury = win->cury;
curscr->curx = win->curx;
}
}
/* Don't leave the screen with attributes set. */
__unsetattr(0);
(void) fflush(_cursesi_screen->outfd);
return (OK);
}
/*
* makech --
* Make a change on the screen.
*/
static int
makech(wy)
int wy;
{
WINDOW *win;
static __LDATA blank = {' ', 0, ' ', 0};
__LDATA *nsp, *csp, *cp, *cep;
int clsp, nlsp; /* Last space in lines. */
int lch, wx;
char *ce;
attr_t lspc; /* Last space colour */
attr_t off, on;
#ifdef __GNUC__
nlsp = lspc = 0; /* XXX gcc -Wuninitialized */
#endif
if (_cursesi_screen->curwin)
win = curscr;
else
win = __virtscr;
/* Is the cursor still on the end of the last line? */
if (wy > 0 && curscr->lines[wy - 1]->flags & __ISPASTEOL) {
domvcur(_cursesi_screen->ly, _cursesi_screen->lx,
_cursesi_screen->ly + 1, 0);
_cursesi_screen->ly++;
_cursesi_screen->lx = 0;
}
wx = *win->lines[wy]->firstchp;
if (wx < 0)
wx = 0;
else
if (wx >= win->maxx)
return (OK);
lch = *win->lines[wy]->lastchp;
if (lch < 0)
return (OK);
else
if (lch >= (int) win->maxx)
lch = win->maxx - 1;
if (_cursesi_screen->curwin)
csp = &blank;
else
csp = &curscr->lines[wy]->line[wx];
nsp = &win->lines[wy]->line[wx];
if (__tc_ce && !_cursesi_screen->curwin) {
cp = &win->lines[wy]->line[win->maxx - 1];
lspc = cp->attr & __COLOR;
while (cp->ch == ' ' && cp->attr == lspc)
if (cp-- <= win->lines[wy]->line)
break;
nlsp = cp - win->lines[wy]->line;
if (nlsp < 0)
nlsp = 0;
}
if (!_cursesi_screen->curwin)
ce = __tc_ce;
else
ce = NULL;
while (wx <= lch) {
if (memcmp(nsp, csp, sizeof(__LDATA)) == 0) {
if (wx <= lch) {
while (wx <= lch &&
memcmp(nsp, csp, sizeof(__LDATA)) == 0) {
nsp++;
if (!_cursesi_screen->curwin)
++csp;
++wx;
}
continue;
}
break;
}
domvcur(_cursesi_screen->ly, _cursesi_screen->lx, wy, wx);
#ifdef DEBUG
__CTRACE("makech: 1: wx = %d, ly= %d, lx = %d, newy = %d, newx = %d\n",
wx, _cursesi_screen->ly, _cursesi_screen->lx, wy, wx);
#endif
_cursesi_screen->ly = wy;
_cursesi_screen->lx = wx;
while (memcmp(nsp, csp, sizeof(__LDATA)) != 0 && wx <= lch) {
if (ce != NULL &&
wx >= nlsp && nsp->ch == ' ' && nsp->attr == lspc) {
/* Check for clear to end-of-line. */
cep = &curscr->lines[wy]->line[win->maxx - 1];
while (cep->ch == ' ' && cep->attr == lspc)
if (cep-- <= csp)
break;
clsp = cep - curscr->lines[wy]->line -
win->begx * __LDATASIZE;
#ifdef DEBUG
__CTRACE("makech: clsp = %d, nlsp = %d\n",
clsp, nlsp);
#endif
if (((clsp - nlsp >= strlen(__tc_ce) &&
clsp < win->maxx * __LDATASIZE) ||
wy == win->maxy - 1) &&
(!(lspc & __COLOR) ||
((lspc & __COLOR) && __tc_ut))) {
__unsetattr(0);
if (__using_color &&
((lspc & __COLOR) !=
(curscr->wattr & __COLOR)))
__set_color(curscr, lspc &
__COLOR);
tputs(__tc_ce, 0, __cputchar);
_cursesi_screen->lx = wx + win->begx;
while (wx++ <= clsp) {
csp->ch = ' ';
csp->attr = lspc;
csp++;
}
return (OK);
}
ce = NULL;
}
#ifdef DEBUG
__CTRACE("makech: have attributes %08x, need attributes %08x\n", curscr->wattr, nsp->attr);
#endif
off = ~nsp->attr & curscr->wattr;
/*
* Unset attributes as appropriate. Unset first
* so that the relevant attributes can be reset
* (because 'me' unsets 'mb', 'md', 'mh', 'mk',
* 'mp' and 'mr'). Check to see if we also turn off
* standout, attributes and colour.
*/
if (off & __TERMATTR && __tc_me != NULL) {
tputs(__tc_me, 0, __cputchar);
curscr->wattr &= __mask_me;
off &= __mask_me;
}
/*
* Exit underscore mode if appropriate.
* Check to see if we also turn off standout,
* attributes and colour.
*/
if (off & __UNDERSCORE && __tc_ue != NULL) {
tputs(__tc_ue, 0, __cputchar);
curscr->wattr &= __mask_ue;
off &= __mask_ue;
}
/*
* Exit standout mode as appropriate.
* Check to see if we also turn off underscore,
* attributes and colour.
* XXX
* Should use uc if so/se not available.
*/
if (off & __STANDOUT && __tc_se != NULL) {
tputs(__tc_se, 0, __cputchar);
curscr->wattr &= __mask_se;
off &= __mask_se;
}
if (off & __ALTCHARSET && __tc_ae != NULL) {
tputs(__tc_ae, 0, __cputchar);
curscr->wattr &= ~__ALTCHARSET;
}
/* Set/change colour as appropriate. */
if (__using_color)
__set_color(curscr, nsp->attr & __COLOR);
on = nsp->attr & ~curscr->wattr;
/*
* Enter standout mode if appropriate.
*/
if (on & __STANDOUT && __tc_so != NULL && __tc_se
!= NULL) {
tputs(__tc_so, 0, __cputchar);
curscr->wattr |= __STANDOUT;
}
/*
* Enter underscore mode if appropriate.
* XXX
* Should use uc if us/ue not available.
*/
if (on & __UNDERSCORE && __tc_us != NULL &&
__tc_ue != NULL) {
tputs(__tc_us, 0, __cputchar);
curscr->wattr |= __UNDERSCORE;
}
/*
* Set other attributes as appropriate.
*/
if (__tc_me != NULL) {
if (on & __BLINK && __tc_mb != NULL) {
tputs(__tc_mb, 0, __cputchar);
curscr->wattr |= __BLINK;
}
if (on & __BOLD && __tc_md != NULL) {
tputs(__tc_md, 0, __cputchar);
curscr->wattr |= __BOLD;
}
if (on & __DIM && __tc_mh != NULL) {
tputs(__tc_mh, 0, __cputchar);
curscr->wattr |= __DIM;
}
if (on & __BLANK && __tc_mk != NULL) {
tputs(__tc_mk, 0, __cputchar);
curscr->wattr |= __BLANK;
}
if (on & __PROTECT && __tc_mp != NULL) {
tputs(__tc_mp, 0, __cputchar);
curscr->wattr |= __PROTECT;
}
if (on & __REVERSE && __tc_mr != NULL) {
tputs(__tc_mr, 0, __cputchar);
curscr->wattr |= __REVERSE;
}
}
/* Enter/exit altcharset mode as appropriate. */
if (on & __ALTCHARSET && __tc_as != NULL &&
__tc_ae != NULL) {
tputs(__tc_as, 0, __cputchar);
curscr->wattr |= __ALTCHARSET;
}
wx++;
if (wx >= win->maxx &&
wy == win->maxy - 1 && !_cursesi_screen->curwin)
if (win->flags & __SCROLLOK) {
if (win->flags & __ENDLINE)
__unsetattr(1);
if (!(win->flags & __SCROLLWIN)) {
if (!_cursesi_screen->curwin) {
csp->attr = nsp->attr;
__cputchar((int)
(csp->ch =
nsp->ch));
} else
__cputchar((int) nsp->ch);
}
if (wx < curscr->maxx) {
domvcur(_cursesi_screen->ly, wx,
(int) (win->maxy - 1),
(int) (win->maxx - 1));
}
_cursesi_screen->ly = win->maxy - 1;
_cursesi_screen->lx = win->maxx - 1;
return (OK);
}
if (wx < win->maxx || wy < win->maxy - 1 ||
!(win->flags & __SCROLLWIN)) {
if (!_cursesi_screen->curwin) {
csp->attr = nsp->attr;
__cputchar((int) (csp->ch = nsp->ch));
csp++;
} else
__cputchar((int) nsp->ch);
}
#ifdef DEBUG
__CTRACE("makech: putchar(%c)\n", nsp->ch & 0177);
#endif
if (__tc_uc && ((nsp->attr & __STANDOUT) ||
(nsp->attr & __UNDERSCORE))) {
__cputchar('\b');
tputs(__tc_uc, 0, __cputchar);
}
nsp++;
#ifdef DEBUG
__CTRACE("makech: 2: wx = %d, lx = %d\n", wx, _cursesi_screen->lx);
#endif
}
if (_cursesi_screen->lx == wx) /* If no change. */
break;
_cursesi_screen->lx = wx;
if (_cursesi_screen->lx >= COLS && __tc_am)
_cursesi_screen->lx = COLS - 1;
else
if (wx >= win->maxx) {
domvcur(_cursesi_screen->ly,
_cursesi_screen->lx,
_cursesi_screen->ly,
(int) (win->maxx - 1));
_cursesi_screen->lx = win->maxx - 1;
}
#ifdef DEBUG
__CTRACE("makech: 3: wx = %d, lx = %d\n", wx,
_cursesi_screen->lx);
#endif
}
return (OK);
}
/*
* domvcur --
* Do a mvcur, leaving attributes if necessary.
*/
static void
domvcur(oy, ox, ny, nx)
int oy, ox, ny, nx;
{
__unsetattr(1);
__mvcur(oy, ox, ny, nx, 1);
}
/*
* Quickch() attempts to detect a pattern in the change of the window
* in order to optimize the change, e.g., scroll n lines as opposed to
* repainting the screen line by line.
*/
static __LDATA buf[128];
static u_int last_hash;
static size_t last_hash_len;
#define BLANKSIZE (sizeof(buf) / sizeof(buf[0]))
static void
quickch(void)
{
#define THRESH (int) __virtscr->maxy / 4
__LINE *clp, *tmp1, *tmp2;
int bsize, curs, curw, starts, startw, i, j;
int n, target, cur_period, bot, top, sc_region;
u_int blank_hash;
attr_t bcolor;
#ifdef __GNUC__
curs = curw = starts = startw = 0; /* XXX gcc -Wuninitialized */
#endif
/*
* Find how many lines from the top of the screen are unchanged.
*/
for (top = 0; top < __virtscr->maxy; top++)
if (__virtscr->lines[top]->flags & __ISDIRTY &&
(__virtscr->lines[top]->hash != curscr->lines[top]->hash ||
memcmp(__virtscr->lines[top]->line,
curscr->lines[top]->line,
(size_t) __virtscr->maxx * __LDATASIZE) != 0))
break;
else
__virtscr->lines[top]->flags &= ~__ISDIRTY;
/*
* Find how many lines from bottom of screen are unchanged.
*/
for (bot = __virtscr->maxy - 1; bot >= 0; bot--)
if (__virtscr->lines[bot]->flags & __ISDIRTY &&
(__virtscr->lines[bot]->hash != curscr->lines[bot]->hash ||
memcmp(__virtscr->lines[bot]->line,
curscr->lines[bot]->line,
(size_t) __virtscr->maxx * __LDATASIZE) != 0))
break;
else
__virtscr->lines[bot]->flags &= ~__ISDIRTY;
/*
* Work round an xterm bug where inserting lines causes all the
* inserted lines to be covered with the background colour we
* set on the first line (even if we unset it for subsequent
* lines).
*/
bcolor = __virtscr->lines[min(top,
__virtscr->maxy - 1)]->line[0].attr & __COLOR;
for (i = top + 1, j = 0; i < bot; i++) {
if ((__virtscr->lines[i]->line[0].attr & __COLOR) != bcolor) {
bcolor = __virtscr->lines[i]->line[__virtscr->maxx].
attr & __COLOR;
j = i - top;
} else
break;
}
top += j;
#ifdef NO_JERKINESS
/*
* If we have a bottom unchanged region return. Scrolling the
* bottom region up and then back down causes a screen jitter.
* This will increase the number of characters sent to the screen
* but it looks better.
*/
if (bot < __virtscr->maxy - 1)
return;
#endif /* NO_JERKINESS */
/*
* Search for the largest block of text not changed.
* Invariants of the loop:
* - Startw is the index of the beginning of the examined block in
* __virtscr.
* - Starts is the index of the beginning of the examined block in
* curscr.
* - Curw is the index of one past the end of the exmined block in
* __virtscr.
* - Curs is the index of one past the end of the exmined block in
* curscr.
* - bsize is the current size of the examined block.
*/
for (bsize = bot - top; bsize >= THRESH; bsize--) {
for (startw = top; startw <= bot - bsize; startw++)
for (starts = top; starts <= bot - bsize;
starts++) {
for (curw = startw, curs = starts;
curs < starts + bsize; curw++, curs++)
if (__virtscr->lines[curw]->hash !=
curscr->lines[curs]->hash)
break;
if (curs != starts + bsize)
continue;
for (curw = startw, curs = starts;
curs < starts + bsize; curw++, curs++)
if (memcmp(__virtscr->lines[curw]->line,
curscr->lines[curs]->line,
(size_t) __virtscr->maxx *
__LDATASIZE) != 0)
break;
if (curs == starts + bsize)
goto done;
}
}
done:
/* Did not find anything */
if (bsize < THRESH)
return;
#ifdef DEBUG
__CTRACE("quickch:bsize=%d,starts=%d,startw=%d,curw=%d,curs=%d,top=%d,bot=%d\n",
bsize, starts, startw, curw, curs, top, bot);
#endif
/*
* Make sure that there is no overlap between the bottom and top
* regions and the middle scrolled block.
*/
if (bot < curs)
bot = curs - 1;
if (top > starts)
top = starts;
n = startw - starts;
#ifdef DEBUG
__CTRACE("#####################################\n");
for (i = 0; i < curscr->maxy; i++) {
__CTRACE("C: %d:", i);
__CTRACE(" 0x%x \n", curscr->lines[i]->hash);
for (j = 0; j < curscr->maxx; j++)
__CTRACE("%c", curscr->lines[i]->line[j].ch);
__CTRACE("\n");
__CTRACE(" attr:");
for (j = 0; j < curscr->maxx; j++)
__CTRACE(" %x", curscr->lines[i]->line[j].attr);
__CTRACE("\n");
__CTRACE("W: %d:", i);
__CTRACE(" 0x%x \n", __virtscr->lines[i]->hash);
__CTRACE(" 0x%x ", __virtscr->lines[i]->flags);
for (j = 0; j < __virtscr->maxx; j++)
__CTRACE("%c", __virtscr->lines[i]->line[j].ch);
__CTRACE("\n");
__CTRACE(" attr:");
for (j = 0; j < __virtscr->maxx; j++)
__CTRACE(" %x", __virtscr->lines[i]->line[j].attr);
__CTRACE("\n");
}
#endif
if (buf[0].ch != ' ') {
for (i = 0; i < BLANKSIZE; i++) {
buf[i].ch = ' ';
buf[i].bch = ' ';
buf[i].attr = 0;
buf[i].battr = 0;
}
}
if (__virtscr->maxx != last_hash_len) {
blank_hash = 0;
for (i = __virtscr->maxx; i > BLANKSIZE; i -= BLANKSIZE) {
blank_hash = __hash_more((char *)(void *)buf, sizeof(buf),
blank_hash);
}
blank_hash = __hash_more((char *)(void *)buf,
i * sizeof(buf[0]), blank_hash);
/* cache result in static data - screen width doesn't change often */
last_hash_len = __virtscr->maxx;
last_hash = blank_hash;
} else
blank_hash = last_hash;
/*
* Perform the rotation to maintain the consistency of curscr.
* This is hairy since we are doing an *in place* rotation.
* Invariants of the loop:
* - I is the index of the current line.
* - Target is the index of the target of line i.
* - Tmp1 points to current line (i).
* - Tmp2 and points to target line (target);
* - Cur_period is the index of the end of the current period.
* (see below).
*
* There are 2 major issues here that make this rotation non-trivial:
* 1. Scrolling in a scrolling region bounded by the top
* and bottom regions determined (whose size is sc_region).
* 2. As a result of the use of the mod function, there may be a
* period introduced, i.e., 2 maps to 4, 4 to 6, n-2 to 0, and
* 0 to 2, which then causes all odd lines not to be rotated.
* To remedy this, an index of the end ( = beginning) of the
* current 'period' is kept, cur_period, and when it is reached,
* the next period is started from cur_period + 1 which is
* guaranteed not to have been reached since that would mean that
* all records would have been reached. (think about it...).
*
* Lines in the rotation can have 3 attributes which are marked on the
* line so that curscr is consistent with the visual screen.
* 1. Not dirty -- lines inside the scrolled block, top region or
* bottom region.
* 2. Blank lines -- lines in the differential of the scrolling
* region adjacent to top and bot regions
* depending on scrolling direction.
* 3. Dirty line -- all other lines are marked dirty.
*/
sc_region = bot - top + 1;
i = top;
tmp1 = curscr->lines[top];
cur_period = top;
for (j = top; j <= bot; j++) {
target = (i - top + n + sc_region) % sc_region + top;
tmp2 = curscr->lines[target];
curscr->lines[target] = tmp1;
/* Mark block as clean and blank out scrolled lines. */
clp = curscr->lines[target];
#ifdef DEBUG
__CTRACE("quickch: n=%d startw=%d curw=%d i = %d target=%d ",
n, startw, curw, i, target);
#endif
if ((target >= startw && target < curw) || target < top
|| target > bot) {
#ifdef DEBUG
__CTRACE("-- notdirty\n");
#endif
__virtscr->lines[target]->flags &= ~__ISDIRTY;
} else
if ((n > 0 && target >= top && target < top + n) ||
(n < 0 && target <= bot && target > bot + n)) {
if (clp->hash != blank_hash || memcmp(clp->line,
clp->line + 1, (__virtscr->maxx - 1) *
__LDATASIZE) || memcmp(clp->line, buf,
__LDATASIZE)) {
for (i = __virtscr->maxx; i > BLANKSIZE;
i -= BLANKSIZE) {
(void)memcpy(clp->line + i -
BLANKSIZE, buf, sizeof(buf));
}
(void)memcpy(clp->line , buf, i *
sizeof(buf[0]));
#ifdef DEBUG
__CTRACE("-- blanked out: dirty\n");
#endif
clp->hash = blank_hash;
__touchline(__virtscr, target, 0, (int) __virtscr->maxx - 1);
} else {
#ifdef DEBUG
__CTRACE(" -- blank line already: dirty\n");
#endif
__touchline(__virtscr, target, 0, (int) __virtscr->maxx - 1);
}
} else {
#ifdef DEBUG
__CTRACE(" -- dirty\n");
#endif
__touchline(__virtscr, target, 0, (int) __virtscr->maxx - 1);
}
if (target == cur_period) {
i = target + 1;
tmp1 = curscr->lines[i];
cur_period = i;
} else {
tmp1 = tmp2;
i = target;
}
}
#ifdef DEBUG
__CTRACE("$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$\n");
for (i = 0; i < curscr->maxy; i++) {
__CTRACE("C: %d:", i);
for (j = 0; j < curscr->maxx; j++)
__CTRACE("%c", curscr->lines[i]->line[j].ch);
__CTRACE("\n");
__CTRACE("W: %d:", i);
for (j = 0; j < __virtscr->maxx; j++)
__CTRACE("%c", __virtscr->lines[i]->line[j].ch);
__CTRACE("\n");
}
#endif
if (n != 0)
scrolln(starts, startw, curs, bot, top);
}
/*
* scrolln --
* Scroll n lines, where n is starts - startw.
*/
static void /* ARGSUSED */
scrolln(starts, startw, curs, bot, top)
int starts, startw, curs, bot, top;
{
int i, oy, ox, n;
oy = curscr->cury;
ox = curscr->curx;
n = starts - startw;
/*
* XXX
* The initial tests that set __noqch don't let us reach here unless
* we have either cs + ho + SF/sf/SR/sr, or AL + DL. SF/sf and SR/sr
* scrolling can only shift the entire scrolling region, not just a
* part of it, which means that the quickch() routine is going to be
* sadly disappointed in us if we don't have cs as well.
*
* If cs, ho and SF/sf are set, can use the scrolling region. Because
* the cursor position after cs is undefined, we need ho which gives us
* the ability to move to somewhere without knowledge of the current
* location of the cursor. Still call __mvcur() anyway, to update its
* idea of where the cursor is.
*
* When the scrolling region has been set, the cursor has to be at the
* last line of the region to make the scroll happen.
*
* Doing SF/SR or AL/DL appears faster on the screen than either sf/sr
* or AL/DL, and, some terminals have AL/DL, sf/sr, and cs, but not
* SF/SR. So, if we're scrolling almost all of the screen, try and use
* AL/DL, otherwise use the scrolling region. The "almost all" is a
* shameless hack for vi.
*/
if (n > 0) {
if (__tc_cs != NULL && __tc_ho != NULL && (__tc_SF != NULL ||
((__tc_AL == NULL || __tc_DL == NULL ||
top > 3 || bot + 3 < __virtscr->maxy) &&
__tc_sf != NULL))) {
tputs(__tscroll(__tc_cs, top, bot + 1), 0, __cputchar);
__mvcur(oy, ox, 0, 0, 1);
tputs(__tc_ho, 0, __cputchar);
__mvcur(0, 0, bot, 0, 1);
if (__tc_SF != NULL)
tputs(__tscroll(__tc_SF, n, 0), 0, __cputchar);
else
for (i = 0; i < n; i++)
tputs(__tc_sf, 0, __cputchar);
tputs(__tscroll(__tc_cs, 0, (int) __virtscr->maxy), 0,
__cputchar);
__mvcur(bot, 0, 0, 0, 1);
tputs(__tc_ho, 0, __cputchar);
__mvcur(0, 0, oy, ox, 1);
return;
}
/* Scroll up the block. */
if (__tc_SF != NULL && top == 0) {
__mvcur(oy, ox, bot, 0, 1);
tputs(__tscroll(__tc_SF, n, 0), 0, __cputchar);
} else
if (__tc_DL != NULL) {
__mvcur(oy, ox, top, 0, 1);
tputs(__tscroll(__tc_DL, n, 0), 0, __cputchar);
} else
if (__tc_dl != NULL) {
__mvcur(oy, ox, top, 0, 1);
for (i = 0; i < n; i++)
tputs(__tc_dl, 0, __cputchar);
} else
if (__tc_sf != NULL && top == 0) {
__mvcur(oy, ox, bot, 0, 1);
for (i = 0; i < n; i++)
tputs(__tc_sf, 0,
__cputchar);
} else
abort();
/* Push down the bottom region. */
__mvcur(top, 0, bot - n + 1, 0, 1);
if (__tc_AL != NULL)
tputs(__tscroll(__tc_AL, n, 0), 0, __cputchar);
else
if (__tc_al != NULL)
for (i = 0; i < n; i++)
tputs(__tc_al, 0, __cputchar);
else
abort();
__mvcur(bot - n + 1, 0, oy, ox, 1);
} else {
/*
* !!!
* n < 0
*
* If cs, ho and SR/sr are set, can use the scrolling region.
* See the above comments for details.
*/
if (__tc_cs != NULL && __tc_ho != NULL && (__tc_SR != NULL ||
((__tc_AL == NULL || __tc_DL == NULL || top > 3 ||
bot + 3 < __virtscr->maxy) && __tc_sr != NULL))) {
tputs(__tscroll(__tc_cs, top, bot + 1), 0, __cputchar);
__mvcur(oy, ox, 0, 0, 1);
tputs(__tc_ho, 0, __cputchar);
__mvcur(0, 0, top, 0, 1);
if (__tc_SR != NULL)
tputs(__tscroll(__tc_SR, -n, 0), 0, __cputchar);
else
for (i = n; i < 0; i++)
tputs(__tc_sr, 0, __cputchar);
tputs(__tscroll(__tc_cs, 0, (int) __virtscr->maxy), 0,
__cputchar);
__mvcur(top, 0, 0, 0, 1);
tputs(__tc_ho, 0, __cputchar);
__mvcur(0, 0, oy, ox, 1);
return;
}
/* Preserve the bottom lines. */
__mvcur(oy, ox, bot + n + 1, 0, 1);
if (__tc_SR != NULL && bot == __virtscr->maxy)
tputs(__tscroll(__tc_SR, -n, 0), 0, __cputchar);
else
if (__tc_DL != NULL)
tputs(__tscroll(__tc_DL, -n, 0), 0, __cputchar);
else
if (__tc_dl != NULL)
for (i = n; i < 0; i++)
tputs(__tc_dl, 0, __cputchar);
else
if (__tc_sr != NULL &&
bot == __virtscr->maxy)
for (i = n; i < 0; i++)
tputs(__tc_sr, 0,
__cputchar);
else
abort();
/* Scroll the block down. */
__mvcur(bot + n + 1, 0, top, 0, 1);
if (__tc_AL != NULL)
tputs(__tscroll(__tc_AL, -n, 0), 0, __cputchar);
else
if (__tc_al != NULL)
for (i = n; i < 0; i++)
tputs(__tc_al, 0, __cputchar);
else
abort();
__mvcur(top, 0, oy, ox, 1);
}
}
/*
* __unsetattr --
* Unset attributes on curscr. Leave standout, attribute and colour
* modes if necessary (!ms). Always leave altcharset (xterm at least
* ignores a cursor move if we don't).
*/
void /* ARGSUSED */
__unsetattr(int checkms)
{
int isms;
if (checkms)
if (!__tc_ms) {
isms = 1;
} else {
isms = 0;
}
else
isms = 1;
#ifdef DEBUG
__CTRACE("__unsetattr: checkms = %d, ms = %s, wattr = %08x\n",
checkms, __tc_ms ? "TRUE" : "FALSE", curscr->wattr);
#endif
/*
* Don't leave the screen in standout mode (check against ms). Check
* to see if we also turn off underscore, attributes and colour.
*/
if (curscr->wattr & __STANDOUT && isms) {
tputs(__tc_se, 0, __cputchar);
curscr->wattr &= __mask_se;
}
/*
* Don't leave the screen in underscore mode (check against ms).
* Check to see if we also turn off attributes. Assume that we
* also turn off colour.
*/
if (curscr->wattr & __UNDERSCORE && isms) {
tputs(__tc_ue, 0, __cputchar);
curscr->wattr &= __mask_ue;
}
/*
* Don't leave the screen with attributes set (check against ms).
* Assume that also turn off colour.
*/
if (curscr->wattr & __TERMATTR && isms) {
tputs(__tc_me, 0, __cputchar);
curscr->wattr &= __mask_me;
}
/* Don't leave the screen with altcharset set (don't check ms). */
if (curscr->wattr & __ALTCHARSET) {
tputs(__tc_ae, 0, __cputchar);
curscr->wattr &= ~__ALTCHARSET;
}
/* Don't leave the screen with colour set (check against ms). */
if (__using_color && isms)
__unset_color(curscr);
}
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