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xss
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Added "magic" screensaver hack (B/W for now)

This commit is contained in:
Neale Pickett 2008-04-14 22:57:19 -06:00
parent 61cf40a421
commit 48249418df
3 changed files with 202 additions and 4 deletions
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2
Makefile
View File

@ -1,7 +1,7 @@
CFLAGS = -Wall
LDLIBS = -lX11
all: xss xsswin xcursorpos
all: xss xsswin xcursorpos magic
xss: LDLIBS += -lXss

9
README
View File

@ -12,6 +12,9 @@ keyboard and mouse events.
`xcursorpos` prints out the x and y coordinates of the cursor.
`magic` is a reimplementation of the "magic" screen saver from After
Dark.
Examples
--------
@ -25,13 +28,13 @@ Run like `xautolock`:
xss xlock -mode qix &
Shell script to run an `xscreensaver` hack and `xtrlock` at the same
time, but prevent locking if the cursor is in the upper-left corner:
Shell script to run `magic` and `xtrlock` at the same time, but prevent
locking if the cursor is in the upper-left corner:
#! /bin/sh
xcursorpos | (read x y; [ $x -lt 20 -a $y -lt 20 ]) && exit 0
xsswin /usr/lib/xscreensaver/qix -window-id XSS_WINDOW &
xsswin magic XSS_WINDOW &
pid=$!
xtrlock
kill $pid

195
magic.c Normal file
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@ -0,0 +1,195 @@
/* magic -- "Magic" (qix) screen saver hack
* Copyright (C) 2008 Neale Pickett <neale@woozle.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <time.h>
#include <X11/Xlib.h>
#include "obj.h"
#define FPS 17
#define TRAILPCT 50
#define MAXDELTAPML 14
#define MINDELTAPML 2
#define nsec (1000000000 / FPS)
#define max(a,b) (((a) > (b)) ? (a) : (b))
void
sum(short *a, short b, short *v, int m)
{
*a = b + *v;
if (*a < 0) {
*a *= -1;
*v *= -1;
} else if (*a > m) {
*a = (m*2) - *a;
*v *= -1;
}
}
int
main(int argc, char * const argv[])
{
Display *display;
Window w = (Window)0;
GC gc = (GC)0;
GC egc = (GC)0;
int i;
for (i = 1; i < argc; i += 1) {
if (0 == strcmp(argv[i], "-window-id")) {
/* For compatibility reasons, just ignore */
} else if (w) {
w = (Window)-1;
break;
} else {
char *end;
if (argv[i][0] == '0' && argv[i][1] == 'x') {
w = (Window)strtol(argv[i] + 2, &end, 16);
} else {
w = (Window)strtol(argv[i], &end, 10);
}
if ('\0' != *end) {
w = (Window)-1;
break;
}
}
}
if ((Window)-1 == w) {
fprintf(stderr, "Usage: %s [WINDOW_ID]\n", argv[0]);
return 64; /* EX_USAGE */
}
try {
int screen;
Window root;
XSegment velocity, *lines;
int width, height, nlines;
if (! (display = XOpenDisplay(NULL))) raise("cannot open display");
screen = DefaultScreen(display);
root = RootWindow(display, screen);
if (w) {
XWindowAttributes wa;
XGetWindowAttributes(display, w, &wa);
width = wa.width;
height = wa.height;
} else {
XSetWindowAttributes wa;
XColor black;
zero(wa);
zero(black);
wa.override_redirect = 1;
wa.background_pixel = BlackPixel(display, screen);
width = DisplayWidth(display, screen) / 3;
height = DisplayHeight(display, screen) / 3;
w = XCreateWindow(display, root,
0, 0,
width, height, 0,
CopyFromParent, CopyFromParent, CopyFromParent,
CWBackPixel,
&wa);
XMapWindow(display, w);
}
{
XGCValues values;
gc = XCreateGC(display, w, 0, &values);
if (! XSetForeground(display, gc, WhitePixel(display, screen))) break;
if (! XSetBackground(display, gc, BlackPixel(display, screen))) break;
egc = XCreateGC(display, w, 0, &values);
if (! XSetForeground(display, egc, BlackPixel(display, screen))) break;
if (! XSetBackground(display, egc, WhitePixel(display, screen))) break;
}
srandom((unsigned int)time(NULL));
{
int u, l;
u = width * MAXDELTAPML / 1000;
l = width * MINDELTAPML / 1000;
velocity.x1 = (short)(random() % (u - l)) + l;
velocity.y1 = (short)(random() % (u - l)) + l;
velocity.x2 = (short)(random() % (u - l)) + l;
velocity.y2 = (short)(random() % (u - l)) + l;
}
nlines = (width * TRAILPCT) / (max(velocity.y1, velocity.y2) * 100);
lines = (XSegment *)calloc(nlines, sizeof(XSegment));
lines[0].x1 = (short)(random() % width);
lines[0].y1 = (short)(random() % height);
lines[0].x2 = (short)(random() % width);
lines[0].y2 = (short)(random() % height);
i = 0;
while (1) {
XSegment segments[2];
struct timespec req = {0, nsec};
int j = (i + 1) % nlines;
(void)memcpy(segments + 0, lines + j, sizeof(XSegment));
(void)memcpy(segments + 1, lines + j, sizeof(XSegment));
segments[1].x1 = width - segments[0].x1;
segments[1].x2 = width - segments[0].x2;
XDrawSegments(display, (Drawable)w, egc, segments, 2);
sum(&(lines[j].x1), lines[i].x1, &(velocity.x1), width);
sum(&(lines[j].y1), lines[i].y1, &(velocity.y1), height);
sum(&(lines[j].x2), lines[i].x2, &(velocity.x2), width);
sum(&(lines[j].y2), lines[i].y2, &(velocity.y2), height);
(void)memcpy(segments + 0, lines + j, sizeof(XSegment));
(void)memcpy(segments + 1, lines + j, sizeof(XSegment));
segments[1].x1 = width - segments[0].x1;
segments[1].x2 = width - segments[0].x2;
XDrawSegments(display, (Drawable)w, gc, segments, 2);
XSync(display, True);
(void)nanosleep(&req, NULL);
i = j;
}
}
if (display) {
if (gc) {
(void)XFreeGC(display, gc);
(void)XFreeGC(display, egc);
}
(void)XCloseDisplay(display);
}
except {
fprintf(stderr, "Error: %s\n", exception);
return 69; /* EX_UNAVAILABLE */
}
return 0;
}