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/* xscreensaver, Copyright (c) 2008 Jamie Zawinski <jwz@jwz.org>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*
* Draws repetitive patterns that should undo burned in LCD screens.
* Concept shamelessly cloned from
* http://toastycode.com/blog/2008/02/05/lcd-scrub/
*/
#include "screenhack.h"
struct state {
Display *dpy;
Window window;
XWindowAttributes xgwa;
enum { HORIZ_W, HORIZ_B,
VERT_W, VERT_B,
DIAG_W, DIAG_B,
WHITE, BLACK,
END } mode;
unsigned int enabled_mask;
int count;
GC fg, bg;
int delay;
int spread;
int cycles;
};
static void
pick_mode (struct state *st)
{
st->count = 0;
while (1)
{
if (++st->mode == END)
st->mode = 0;
if (st->enabled_mask & (1 << st->mode))
break;
}
}
static void *
lcdscrub_init (Display *dpy, Window window)
{
struct state *st = (struct state *) calloc (1, sizeof(*st));
XGCValues gcv;
st->dpy = dpy;
st->window = window;
st->delay = get_integer_resource (st->dpy, "delay", "Integer");
st->spread = get_integer_resource (st->dpy, "spread", "Integer");
st->cycles = get_integer_resource (st->dpy, "cycles", "Integer");
XGetWindowAttributes (st->dpy, st->window, &st->xgwa);
gcv.foreground = BlackPixelOfScreen (st->xgwa.screen);
gcv.background = WhitePixelOfScreen (st->xgwa.screen);
st->bg = XCreateGC (st->dpy, st->window, GCForeground, &gcv);
gcv.foreground = WhitePixelOfScreen (st->xgwa.screen);
gcv.background = BlackPixelOfScreen (st->xgwa.screen);
st->fg = XCreateGC (st->dpy, st->window, GCForeground, &gcv);
#ifdef HAVE_COCOA
jwxyz_XSetAntiAliasing (st->dpy, st->fg, False);
jwxyz_XSetAntiAliasing (st->dpy, st->bg, False);
#endif
st->enabled_mask = 0;
# define PREF(R,F) \
if (get_boolean_resource (st->dpy, R, "Mode")) st->enabled_mask |= (1 << F)
PREF("modeHW", HORIZ_W);
PREF("modeHB", HORIZ_B);
PREF("modeVW", VERT_W);
PREF("modeVB", VERT_B);
PREF("modeDW", DIAG_W);
PREF("modeDB", DIAG_B);
PREF("modeW", WHITE);
PREF("modeB", BLACK);
# undef PREF
if (! st->enabled_mask)
{
fprintf (stderr, "%s: no modes enabled\n", progname);
exit (1);
}
pick_mode (st);
return st;
}
static unsigned long
lcdscrub_draw (Display *dpy, Window window, void *closure)
{
struct state *st = (struct state *) closure;
int count = st->count % st->spread;
int i;
GC fg = (st->mode & 1 ? st->fg : st->bg);
GC bg = (st->mode & 1 ? st->bg : st->fg);
switch (st->mode) {
case HORIZ_W:
case HORIZ_B:
XFillRectangle (st->dpy, st->window, bg, 0, 0,
st->xgwa.width, st->xgwa.height);
for (i = count; i < st->xgwa.height; i += st->spread)
XDrawLine (st->dpy, st->window, fg, 0, i, st->xgwa.width, i);
break;
case VERT_W:
case VERT_B:
XFillRectangle (st->dpy, st->window, bg, 0, 0,
st->xgwa.width, st->xgwa.height);
for (i = count; i < st->xgwa.width; i += st->spread)
XDrawLine (st->dpy, st->window, fg, i, 0, i, st->xgwa.height);
break;
case DIAG_W:
case DIAG_B:
XFillRectangle (st->dpy, st->window, bg, 0, 0,
st->xgwa.width, st->xgwa.height);
for (i = count; i < st->xgwa.width; i += st->spread)
XDrawLine (st->dpy, st->window, fg, i, 0,
i + st->xgwa.width, st->xgwa.width);
for (i = -count; i < st->xgwa.height; i += st->spread)
XDrawLine (st->dpy, st->window, fg, 0, i,
st->xgwa.height, i + st->xgwa.height);
break;
case WHITE:
case BLACK:
XFillRectangle (st->dpy, st->window, bg, 0, 0,
st->xgwa.width, st->xgwa.height);
break;
default:
abort();
break;
}
st->count++;
if (st->count > st->spread * st->cycles)
pick_mode (st);
return st->delay;
}
static void
lcdscrub_reshape (Display *dpy, Window window, void *closure,
unsigned int w, unsigned int h)
{
}
static Bool
lcdscrub_event (Display *dpy, Window window, void *closure, XEvent *event)
{
return False;
}
static void
lcdscrub_free (Display *dpy, Window window, void *closure)
{
struct state *st = (struct state *) closure;
XFreeGC (dpy, st->fg);
XFreeGC (dpy, st->bg);
free (st);
}
static const char *lcdscrub_defaults [] = {
".background: black",
".foreground: white",
"*delay: 100000",
"*spread: 8",
"*cycles: 60",
"*modeHW: True",
"*modeHB: True",
"*modeVW: True",
"*modeVB: True",
"*modeDW: True",
"*modeDB: True",
"*modeW: True",
"*modeB: True",
0
};
static XrmOptionDescRec lcdscrub_options [] = {
{ "-delay", ".delay", XrmoptionSepArg, 0 },
{ "-spread", ".spread", XrmoptionSepArg, 0 },
{ "-cycles", ".cycles", XrmoptionSepArg, 0 },
{ "-no-hw", ".modeHW", XrmoptionNoArg, "False" },
{ "-no-hb", ".modeHB", XrmoptionNoArg, "False" },
{ "-no-vw", ".modeVW", XrmoptionNoArg, "False" },
{ "-no-vb", ".modeVB", XrmoptionNoArg, "False" },
{ "-no-dw", ".modeDW", XrmoptionNoArg, "False" },
{ "-no-db", ".modeDB", XrmoptionNoArg, "False" },
{ "-no-w", ".modeW", XrmoptionNoArg, "False" },
{ "-no-b", ".modeB", XrmoptionNoArg, "False" },
{ 0, 0, 0, 0 }
};
XSCREENSAVER_MODULE ("LCDscrub", lcdscrub)
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