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/* xscreensaver, Copyright (c) 1992-2008 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.
*/
#include "screenhack.h"
#ifndef HAVE_JWXYZ
# define DO_STIPPLE
#endif
#define NBITS 12
/* On some systems (notably MacOS X) these files are messed up.
* They're tiny, so we might as well just inline them here.
*
* # include <X11/bitmaps/stipple>
* # include <X11/bitmaps/cross_weave>
* # include <X11/bitmaps/dimple1>
* # include <X11/bitmaps/dimple3>
* # include <X11/bitmaps/flipped_gray>
* # include <X11/bitmaps/gray1>
* # include <X11/bitmaps/gray3>
* # include <X11/bitmaps/hlines2>
* # include <X11/bitmaps/light_gray>
* # include <X11/bitmaps/root_weave>
* # include <X11/bitmaps/vlines2>
* # include <X11/bitmaps/vlines3>
*/
#ifdef DO_STIPPLE
#define stipple_width 16
#define stipple_height 4
static unsigned char stipple_bits[] = {
0x55, 0x55, 0xee, 0xee, 0x55, 0x55, 0xba, 0xbb};
#define cross_weave_width 16
#define cross_weave_height 16
static unsigned char cross_weave_bits[] = {
0x55, 0x55, 0x88, 0x88, 0x55, 0x55, 0x22, 0x22, 0x55, 0x55, 0x88, 0x88,
0x55, 0x55, 0x22, 0x22, 0x55, 0x55, 0x88, 0x88, 0x55, 0x55, 0x22, 0x22,
0x55, 0x55, 0x88, 0x88, 0x55, 0x55, 0x22, 0x22};
#define dimple1_width 16
#define dimple1_height 16
static unsigned char dimple1_bits[] = {
0x55, 0x55, 0x00, 0x00, 0x55, 0x55, 0x00, 0x00, 0x55, 0x55, 0x00, 0x00,
0x55, 0x55, 0x00, 0x00, 0x55, 0x55, 0x00, 0x00, 0x55, 0x55, 0x00, 0x00,
0x55, 0x55, 0x00, 0x00, 0x55, 0x55, 0x00, 0x00};
#define dimple3_width 16
#define dimple3_height 16
static unsigned char dimple3_bits[] = {
0x11, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11, 0x11, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x11, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x11, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
#define flipped_gray_width 4
#define flipped_gray_height 2
static char flipped_gray_bits[] = { 0x07, 0x0d};
#define gray1_width 2
#define gray1_height 2
static char gray1_bits[] = { 0x01, 0x02};
#define gray3_width 4
#define gray3_height 4
static char gray3_bits[] = { 0x01, 0x00, 0x04, 0x00};
#define hlines2_width 1
#define hlines2_height 2
static char hlines2_bits[] = { 0x01, 0x00};
#define light_gray_width 4
#define light_gray_height 2
static char light_gray_bits[] = { 0x08, 0x02};
#define root_weave_width 4
#define root_weave_height 4
static char root_weave_bits[] = { 0x07, 0x0d, 0x0b, 0x0e};
#define vlines2_width 2
#define vlines2_height 1
static char vlines2_bits[] = { 0x01};
#define vlines3_width 3
#define vlines3_height 1
static char vlines3_bits[] = { 0x02};
#endif /* DO_STIPPLE */
struct state {
Display *dpy;
Window window;
Pixmap pixmaps [NBITS];
GC gc;
int delay;
unsigned long fg, bg, pixels [512];
int npixels;
int xlim, ylim;
Bool grey_p;
Colormap cmap;
};
static void *
greynetic_init (Display *dpy, Window window)
{
struct state *st = (struct state *) calloc (1, sizeof(*st));
# ifdef DO_STIPPLE
int i;
# endif /* DO_STIPPLE */
XGCValues gcv;
XWindowAttributes xgwa;
st->dpy = dpy;
st->window = window;
XGetWindowAttributes (st->dpy, st->window, &xgwa);
st->xlim = xgwa.width;
st->ylim = xgwa.height;
st->cmap = xgwa.colormap;
st->npixels = 0;
st->grey_p = get_boolean_resource(st->dpy, "grey", "Boolean");
gcv.foreground= st->fg= get_pixel_resource(st->dpy, st->cmap, "foreground","Foreground");
gcv.background= st->bg= get_pixel_resource(st->dpy, st->cmap, "background","Background");
st->delay = get_integer_resource (st->dpy, "delay", "Integer");
if (st->delay < 0) st->delay = 0;
# ifndef DO_STIPPLE
st->gc = XCreateGC (st->dpy, st->window, GCForeground, &gcv);
# ifdef HAVE_JWXYZ /* allow non-opaque alpha components in pixel values */
jwxyz_XSetAlphaAllowed (st->dpy, st->gc, True);
# endif /* HAVE_JWXYZ */
# else /* DO_STIPPLE */
gcv.fill_style= FillOpaqueStippled;
st->gc = XCreateGC (st->dpy, st->window, GCForeground|GCBackground|GCFillStyle, &gcv);
i = 0;
# define BITS(n,w,h) \
st->pixmaps [i++] = \
XCreatePixmapFromBitmapData (st->dpy, st->window, (char *) n, w, h, 1, 0, 1)
BITS (stipple_bits, stipple_width, stipple_height);
BITS (cross_weave_bits, cross_weave_width, cross_weave_height);
BITS (dimple1_bits, dimple1_width, dimple1_height);
BITS (dimple3_bits, dimple3_width, dimple3_height);
BITS (flipped_gray_bits, flipped_gray_width, flipped_gray_height);
BITS (gray1_bits, gray1_width, gray1_height);
BITS (gray3_bits, gray3_width, gray3_height);
BITS (hlines2_bits, hlines2_width, hlines2_height);
BITS (light_gray_bits, light_gray_width, light_gray_height);
BITS (root_weave_bits, root_weave_width, root_weave_height);
BITS (vlines2_bits, vlines2_width, vlines2_height);
BITS (vlines3_bits, vlines3_width, vlines3_height);
# endif /* DO_STIPPLE */
return st;
}
static unsigned long
greynetic_draw (Display *dpy, Window window, void *closure)
{
struct state *st = (struct state *) closure;
int x, y, w=0, h=0, i;
XGCValues gcv;
for (i = 0; i < 10; i++) /* minimize area, but don't try too hard */
{
w = 50 + random () % (st->xlim - 50);
h = 50 + random () % (st->ylim - 50);
if (w + h < st->xlim && w + h < st->ylim)
break;
}
x = random () % (st->xlim - w);
y = random () % (st->ylim - h);
# ifdef DO_STIPPLE
gcv.stipple = st->pixmaps [random () % NBITS];
# endif /* !DO_STIPPLE */
if (mono_p)
{
MONO:
if (random () & 1)
gcv.foreground = st->fg, gcv.background = st->bg;
else
gcv.foreground = st->bg, gcv.background = st->fg;
}
else
{
XColor fgc, bgc;
if (st->npixels == sizeof (st->pixels) / sizeof (unsigned long))
goto REUSE;
fgc.flags = bgc.flags = DoRed|DoGreen|DoBlue;
fgc.red = random ();
fgc.green = random ();
fgc.blue = random ();
# ifdef DO_STIPPLE
bgc.red = random ();
bgc.green = random ();
bgc.blue = random ();
# endif /* DO_STIPPLE */
if (st->grey_p)
{
fgc.green = fgc.blue = fgc.red;
bgc.green = bgc.blue = bgc.red;
}
if (! XAllocColor (st->dpy, st->cmap, &fgc))
goto REUSE;
st->pixels [st->npixels++] = fgc.pixel;
gcv.foreground = fgc.pixel;
# ifdef DO_STIPPLE
if (! XAllocColor (st->dpy, st->cmap, &bgc))
goto REUSE;
st->pixels [st->npixels++] = bgc.pixel;
gcv.background = bgc.pixel;
# endif /* DO_STIPPLE */
goto DONE;
REUSE:
if (st->npixels <= 0)
{
mono_p = 1;
goto MONO;
}
gcv.foreground = st->pixels [random () % st->npixels];
# ifdef DO_STIPPLE
gcv.background = st->pixels [random () % st->npixels];
# endif /* DO_STIPPLE */
DONE:
;
# ifdef HAVE_JWXYZ
{
/* give a non-opaque alpha to the color */
unsigned long pixel = gcv.foreground;
unsigned long amask = BlackPixel (dpy,0);
unsigned long a = (random() & amask);
pixel = (pixel & (~amask)) | a;
gcv.foreground = pixel;
}
# endif /* !HAVE_JWXYZ */
}
# ifndef DO_STIPPLE
XChangeGC (st->dpy, st->gc, GCForeground, &gcv);
# else /* DO_STIPPLE */
XChangeGC (st->dpy, st->gc, GCStipple|GCForeground|GCBackground, &gcv);
# endif /* DO_STIPPLE */
XFillRectangle (st->dpy, st->window, st->gc, x, y, w, h);
return st->delay;
}
static const char *greynetic_defaults [] = {
".background: black",
".foreground: white",
"*fpsSolid: true",
"*delay: 10000",
"*grey: false",
#ifdef HAVE_MOBILE
"*ignoreRotation: True",
#endif
0
};
static XrmOptionDescRec greynetic_options [] = {
{ "-delay", ".delay", XrmoptionSepArg, 0 },
{ "-grey", ".grey", XrmoptionNoArg, "True" },
{ 0, 0, 0, 0 }
};
static void
greynetic_reshape (Display *dpy, Window window, void *closure,
unsigned int w, unsigned int h)
{
struct state *st = (struct state *) closure;
st->xlim = w;
st->ylim = h;
}
static Bool
greynetic_event (Display *dpy, Window window, void *closure, XEvent *event)
{
return False;
}
static void
greynetic_free (Display *dpy, Window window, void *closure)
{
struct state *st = (struct state *) closure;
XFreeGC (st->dpy, st->gc);
free (st);
}
XSCREENSAVER_MODULE ("Greynetic", greynetic)
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