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freebsd-nq/sys/modules/syscons/daemon/daemon_saver.c
Kazutaka YOKOTA 02f2e93b60 - The daemon might go off the screen and crashed the system if the 
screen size was changed while the screen saver was inactive. Adjust
the positions of the daemon and the text and clip them accordingly
each time.

- Don't call set_border() too often. Some video chip may produce
flicker.

Pointed out by tony@dell.com

- Don't fill the entire screen with blank char every time the saver is
called.  Blank only the part of the screen where the daemon and the
text was previously printed.
1997-10-26 07:35:18 +00:00

364 lines
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/*-
* Copyright (c) 1997 Sandro Sigala, Brescia, Italy.
* Copyright (c) 1997 Chris Shenton
* Copyright (c) 1995 S ren Schmidt
* 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
* in this position and unchanged.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* $Id: daemon_saver.c,v 1.6 1997/07/15 14:49:16 yokota Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/exec.h>
#include <sys/sysent.h>
#include <sys/lkm.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <machine/md_var.h>
#include <i386/include/pc/display.h>
#include <saver.h>
#define CONSOLE_VECT(x, y) \
((u_short*)(Crtat + (y)*cur_console->xsize + (x)))
#define DAEMON_MAX_WIDTH 32
#define DAEMON_MAX_HEIGHT 19
MOD_MISC(daemon_saver);
static char *message;
static int messagelen;
/* Who is the author of this ASCII pic? */
static char *daemon_pic[] = {
" , ,",
" /( )`",
" \\ \\___ / |",
" /- _ `-/ '",
" (/\\/ \\ \\ /\\",
" / / | ` \\",
" O O ) / |",
" `-^--'`< '",
" (_.) _ ) /",
" `.___/` /",
" `-----' /",
"<----. __ / __ \\",
"<----|====O)))==) \\) /====",
"<----' `--' `.__,' \\",
" | |",
" \\ / /\\",
" ______( (_ / \\______/",
" ,' ,-----' |",
" `--{__________)",
NULL
};
static char *daemon_attr[] = {
" R R",
" RR RR",
" R RRRR R R",
" RR W RRR R",
" RWWW W R RR",
" W W W R R",
" B B W R R",
" WWWWWWRR R",
" RRRR R R R",
" RRRRRRR R",
" RRRRRRR R",
"YYYYYY RR R RR R",
"YYYYYYYYYYRRRRYYR RR RYYYY",
"YYYYYY RRRR RRRRRR R",
" R R",
" R R RR",
" CCCCCCR RR R RRRRRRRR",
" CC CCCCCCC C",
" CCCCCCCCCCCCCCC",
NULL
};
/*
* Reverse a graphics character, or return unaltered if no mirror;
* should do alphanumerics too, but I'm too lazy. <cshenton@it.hq.nasa.gov>
*/
static char
xflip_symbol(char symbol)
{
static const char lchars[] = "`'(){}[]\\/<>";
static const char rchars[] = "'`)(}{][/\\><";
int pos;
for (pos = 0; lchars[pos] != '\0'; pos++)
if (lchars[pos] == symbol)
return rchars[pos];
return symbol;
}
static void
clear_daemon(int xpos, int ypos, int dxdir, int xoff, int yoff,
int xlen, int ylen)
{
int y;
if (xlen <= 0)
return;
for (y = yoff; y < ylen; y++)
fillw(((FG_LIGHTGREY|BG_BLACK) << 8) | scr_map[0x20],
CONSOLE_VECT(xpos + xoff, ypos + y), xlen - xoff);
}
static void
draw_daemon(int xpos, int ypos, int dxdir, int xoff, int yoff,
int xlen, int ylen)
{
int x, y;
int px;
int attr;
for (y = yoff; y < ylen; y++) {
if (dxdir < 0)
px = xoff;
else
px = DAEMON_MAX_WIDTH - xlen;
if (px >= strlen(daemon_pic[y]))
continue;
for (x = xoff; (x < xlen) && (daemon_pic[y][px] != '\0'); x++, px++) {
switch (daemon_attr[y][px]) {
case 'R': attr = (FG_LIGHTRED|BG_BLACK)<<8; break;
case 'Y': attr = (FG_YELLOW|BG_BLACK)<<8; break;
case 'B': attr = (FG_LIGHTBLUE|BG_BLACK)<<8; break;
case 'W': attr = (FG_LIGHTGREY|BG_BLACK)<<8; break;
case 'C': attr = (FG_CYAN|BG_BLACK)<<8; break;
default: attr = (FG_WHITE|BG_BLACK)<<8; break;
}
if (dxdir < 0) { /* Moving left */
*CONSOLE_VECT(xpos + x, ypos + y) =
scr_map[daemon_pic[y][px]]|attr;
} else { /* Moving right */
*CONSOLE_VECT(xpos + DAEMON_MAX_WIDTH - px - 1, ypos + y) =
scr_map[xflip_symbol(daemon_pic[y][px])]|attr;
}
}
}
}
static void
clear_string(int xpos, int ypos, int xoff, char *s, int len)
{
if (len <= 0)
return;
fillw(((FG_LIGHTGREY|BG_BLACK) << 8) | scr_map[0x20],
CONSOLE_VECT(xpos + xoff, ypos), len - xoff);
}
static void
draw_string(int xpos, int ypos, int xoff, char *s, int len)
{
int x;
for (x = xoff; x < len; x++)
*CONSOLE_VECT(xpos + x, ypos) =
scr_map[s[x]]|(FG_LIGHTGREEN|BG_BLACK)<<8;
}
static void
daemon_saver(int blank)
{
static int txpos = 10, typos = 10;
static int txdir = -1, tydir = -1;
static int dxpos = 0, dypos = 0;
static int dxdir = 1, dydir = 1;
static int moved_daemon = 0;
static int xoff, yoff, toff;
static int xlen, ylen, tlen;
scr_stat *scp = cur_console;
int min, max;
if (blank) {
if (scrn_blanked == 0) {
/* clear the screen and set the border color */
fillw(((FG_LIGHTGREY|BG_BLACK) << 8) | scr_map[0x20],
Crtat, scp->xsize * scp->ysize);
set_border(0);
xlen = ylen = tlen = 0;
}
if (scrn_blanked++ < 2)
return;
scrn_blanked = 1;
clear_daemon(dxpos, dypos, dxdir, xoff, yoff, xlen, ylen);
clear_string(txpos, typos, toff, (char *)message, tlen);
if (++moved_daemon) {
/*
* The daemon picture may be off the screen, if
* screen size is chagened while the screen
* saver is inactive. Make sure the origin of
* the picture is between min and max.
*/
if (scp->xsize <= DAEMON_MAX_WIDTH) {
/*
* If the screen width is too narrow, we
* allow part of the picture go off
* the screen so that the daemon won't
* flip too often.
*/
min = scp->xsize - DAEMON_MAX_WIDTH - 10;
max = 10;
} else {
min = 0;
max = scp->xsize - DAEMON_MAX_WIDTH;
}
if (dxpos <= min) {
dxpos = min;
dxdir = 1;
} else if (dxpos >= max) {
dxpos = max;
dxdir = -1;
}
if (scp->ysize <= DAEMON_MAX_HEIGHT) {
min = scp->ysize - DAEMON_MAX_HEIGHT - 10;
max = 10;
} else {
min = 0;
max = scp->ysize - DAEMON_MAX_HEIGHT;
}
if (dypos <= min) {
dypos = min;
dydir = 1;
} else if (dypos >= max) {
dypos = max;
dydir = -1;
}
moved_daemon = -1;
dxpos += dxdir; dypos += dydir;
/* clip the picture */
xoff = 0;
xlen = DAEMON_MAX_WIDTH;
if (dxpos + xlen <= 0)
xlen = 0;
else if (dxpos < 0)
xoff = -dxpos;
if (dxpos >= scp->xsize)
xlen = 0;
else if (dxpos + xlen > scp->xsize)
xlen = scp->xsize - dxpos;
yoff = 0;
ylen = DAEMON_MAX_HEIGHT;
if (dypos + ylen <= 0)
ylen = 0;
else if (dypos < 0)
yoff = -dypos;
if (dypos >= scp->ysize)
ylen = 0;
else if (dypos + ylen > scp->ysize)
ylen = scp->ysize - dypos;
}
if (scp->xsize <= messagelen) {
min = scp->xsize - messagelen - 10;
max = 10;
} else {
min = 0;
max = scp->xsize - messagelen;
}
if (txpos <= min) {
txpos = min;
txdir = 1;
} else if (txpos >= max) {
txpos = max;
txdir = -1;
}
if (typos <= 0) {
typos = 0;
tydir = 1;
} else if (typos >= scp->ysize - 1) {
typos = scp->ysize - 1;
tydir = -1;
}
txpos += txdir; typos += tydir;
toff = 0;
tlen = messagelen;
if (txpos + tlen <= 0)
tlen = 0;
else if (txpos < 0)
toff = -txpos;
if (txpos >= scp->xsize)
tlen = 0;
else if (txpos + tlen > scp->xsize)
tlen = scp->xsize - txpos;
draw_daemon(dxpos, dypos, dxdir, xoff, yoff, xlen, ylen);
draw_string(txpos, typos, toff, (char *)message, tlen);
} else {
if (scrn_blanked > 0) {
set_border(scp->border);
scrn_blanked = 0;
}
}
}
static int
daemon_saver_load(struct lkm_table *lkmtp, int cmd)
{
int err;
messagelen = strlen(hostname) + 3 + strlen(ostype) + 1 +
strlen(osrelease);
message = malloc(messagelen + 1, M_DEVBUF, M_WAITOK);
sprintf(message, "%s - %s %s", hostname, ostype, osrelease);
err = add_scrn_saver(daemon_saver);
if (err != 0)
free(message, M_DEVBUF);
return err;
}
static int
daemon_saver_unload(struct lkm_table *lkmtp, int cmd)
{
int err;
err = remove_scrn_saver(daemon_saver);
if (err == 0)
free(message, M_DEVBUF);
return err;
}
int
daemon_saver_mod(struct lkm_table *lkmtp, int cmd, int ver)
{
MOD_DISPATCH(daemon_saver, lkmtp, cmd, ver,
daemon_saver_load, daemon_saver_unload, lkm_nullcmd);
}
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