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/* Copyright (C) 1988, 1991 by Jef Poskanzer and Craig Leres.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
*/
#ifndef lint
static char rcsid[] =
"@(#) $Header: xphoon.c,v 1.8 91/09/18 12:58:15 jef Exp $";
#endif
#include <X11/Xos.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <X11/extensions/Xrandr.h>
#include "vroot.h"
#include <stdio.h>
#include <stdlib.h> /* added by David Frey */
#include <malloc.h> /* added by David Frey */
#include <time.h> /* added by David Frey */
#include <math.h>
#include <limits.h> /* added by Lalo Martins */
#include <sys/ioctl.h>
#include <errno.h> /* added by Jeff King */
#include "tws.h"
/* Definitions. */
#define BitmapSize(w,h) ((((w)+7)/8)*(h))
/* Externals. */
extern void getbits();
extern double jtime();
extern double phase();
/* Forward routines. */
static void xinit();
static void make_star_tiles();
static void hack_bits();
static void set_root();
static void cleanup();
/* Routines. */
static char* argv0;
static int seed;
int /* changed void to int, David Frey */
main( argc, argv )
int argc;
char** argv;
{
int moon_w, moon_h, cx, cy, r;
char* moon;
int delayminutes;
int blackflag, demoflag, southflag;
int printpid;
char* display_name;
long clock;
int pid, tty;
int size;
char* mooncopy;
argv0 = argv[0];
getbits( &moon_w, &moon_h, &moon, &cx, &cy, &r );
delayminutes = 0;
blackflag = 0;
demoflag = 0;
southflag = 0;
printpid = 0;
display_name = (char*) 0;
for( ; ; )
{
/* test for -s added by Lalo Martins @ Apr 6, 1999 */
if ( argc > 1 && strcmp( argv[1], "-s" ) == 0 )
{
++argv; --argc;
southflag = 1;
continue;
}
if ( argc > 1 && strcmp( argv[1], "-b" ) == 0 )
{
++argv; --argc;
blackflag = 1;
continue;
}
if ( argc > 2 && strcmp( argv[1], "-t" ) == 0 )
{
++argv; --argc;
if ( sscanf( argv[1], "%d", &delayminutes ) != 1 )
goto usage;
++argv; --argc;
continue;
}
if ( argc > 1 && strcmp( argv[1], "-i" ) == 0 )
{
++argv; --argc;
printpid = 1;
continue;
}
if ( argc > 2 && (
strcmp( argv[1], "-display" ) == 0 ||
strcmp( argv[1], "-displa" ) == 0 ||
strcmp( argv[1], "-displ" ) == 0 ||
strcmp( argv[1], "-disp" ) == 0 ||
strcmp( argv[1], "-dis" ) == 0 ||
strcmp( argv[1], "-di" ) == 0 ||
strcmp( argv[1], "-d" ) == 0 ) )
{
++argv; --argc;
display_name = argv[1];
++argv; --argc;
continue;
}
if ( argc > 1 && strcmp( argv[1], "-demo" ) == 0 )
{
++argv; --argc;
demoflag = 1;
continue;
}
if ( argc > 2 && strcmp( argv[1], "-x" ) == 0 )
{
++argv; --argc;
if ( sscanf( argv[1], "%d", &cx ) != 1 )
goto usage;
++argv; --argc;
continue;
}
if ( argc > 2 && strcmp( argv[1], "-y" ) == 0 )
{
++argv; --argc;
if ( sscanf( argv[1], "%d", &cy ) != 1 )
goto usage;
++argv; --argc;
continue;
}
break;
}
if ( argc > 1 )
{
usage:
(void) fprintf(
stderr,
"usage: %s [-b] [-t minutes [-i]] [-s] [-demo] [-display name]\n",
argv0 );
exit( 1 );
}
/* Initialize the random number generator. */
(void) time( &clock );
srandom( (int) ( clock ^ getpid() ) );
/* Set up X stuff. */
xinit( display_name );
/* Set up the star tiles. */
make_star_tiles();
/* Save a random seed so that the stars always comes out the same. */
seed = random();
/* One-shot mode? */
if ( delayminutes <= 0 && ! demoflag )
{
hack_bits(
dtwstime(), moon_w, moon_h, moon, cx, cy, r, blackflag, demoflag,
southflag );
set_root( moon_w, moon_h, moon, cx, cy, r );
cleanup();
exit( 0 );
}
/* Stick-around mode. */
if ( printpid )
{
pid = fork();
if ( pid < 0 )
{
perror( "fork" );
exit( 1 );
}
else if ( pid > 0 )
{
/* Parent just exits. */
exit( 0 );
}
(void) printf( "%d\n", getpid() );
(void) fflush( stdout );
/* Go stealth (ditch our controlling tty). */
tty = open( "/dev/tty", 0 );
if ( tty < 0 )
{
/* if we don't have a tty, don't flag an error
* Jeff King, Aug 20 2003 */
if ( errno != ENXIO )
{
(void) fprintf( stderr, "%s: ", argv0 );
perror( "/dev/tty open" );
exit( 1 );
}
}
else
{
if ( ioctl( tty, TIOCNOTTY, 0 ) < 0 )
{
(void) fprintf( stderr, "%s: ", argv0 );
perror( "TIOCNOTTY ioctl" );
exit( 1 );
}
(void) close( tty );
}
}
size = BitmapSize( moon_w, moon_h );
mooncopy = (char*) malloc( (unsigned) size );
if ( mooncopy == (char*) 0 )
{
(void) fprintf( stderr, "%s: couldn't copy moon bitmap", argv0 );
exit( 1 );
}
for (;;)
{
bcopy( (char*) moon, (char*) mooncopy, size );
hack_bits(
dtwstime(), moon_w, moon_h, mooncopy, cx, cy, r, blackflag,
demoflag, southflag );
set_root( moon_w, moon_h, mooncopy, cx, cy, r );
if ( demoflag )
sleep( 1 ); /* continuous mode */
else
sleep( (unsigned) ( delayminutes * 60 ) );
}
/*NOTREACHED*/
}
/* xinit - initialize X stuff */
struct crtcinfo {
int x, y, w, h;
};
static Display* display;
static int screen;
static Window root;
static int root_w, root_h;
static GC onegc;
static GC zerogc;
static GC copygc;
static GC clipgc;
static int hasrandr, ncrtc;
struct crtcinfo *crtcs;
static void
xinit( display_name )
char* display_name;
{
Pixmap temp_pixmap;
XGCValues values;
int i, j;
display = XOpenDisplay( display_name );
if ( display == (Display*) 0 )
{
(void) fprintf(
stderr, "%s: can't open display \"%s\"\n", argv0,
XDisplayName( display_name ) );
exit( 1 );
}
screen = DefaultScreen( display );
root = DefaultRootWindow( display );
hasrandr = XRRQueryExtension( display, &i, &j );
if ( ! hasrandr )
{
root_w = DisplayWidth( display, screen );
root_h = DisplayHeight( display, screen );
ncrtc = 1;
crtcs = malloc( sizeof( struct crtcinfo ) );
if ( crtcs == NULL )
{
(void) fprintf( stderr, "%s: couldn't allocate crtc", argv0 );
exit( 1 );
}
crtcs[0].x = 0;
crtcs[0].y = 0;
crtcs[0].w = root_w;
crtcs[0].h = root_h;
}
temp_pixmap = XCreatePixmap( display, root, 1, 1, 1 );
/* Don't want NoExpose events coming back from XCopyArea and XCopyPlane */
values.graphics_exposures = False;
onegc = XCreateGC( display, temp_pixmap, GCGraphicsExposures, &values );
XSetForeground( display, onegc, 1L );
XSetBackground( display, onegc, 0L );
zerogc = XCreateGC( display, temp_pixmap, GCGraphicsExposures, &values );
XSetForeground( display, zerogc, 0L );
XSetBackground( display, zerogc, 1L );
XFreePixmap( display, temp_pixmap );
copygc = XCreateGC( display, root, GCGraphicsExposures, &values );
XSetForeground( display, copygc, BlackPixel( display, screen ) );
XSetBackground( display, copygc, WhitePixel( display, screen ) );
clipgc = XCreateGC( display, root, GCGraphicsExposures, &values );
XSetForeground( display, clipgc, BlackPixel( display, screen ) );
XSetBackground( display, clipgc, WhitePixel( display, screen ) );
}
static void
xrrinit( void )
{
XRRScreenResources *sr;
XRRCrtcInfo *ci;
int i;
if ( ! hasrandr )
return;
root_w = DisplayWidth( display, screen );
root_h = DisplayHeight( display, screen );
sr = XRRGetScreenResources( display, root );
ncrtc = sr->ncrtc;
crtcs = malloc( sizeof( struct crtcinfo ) * ncrtc );
if ( crtcs == NULL )
{
(void) fprintf( stderr, "%s: couldn't allocate crtc", argv0 );
exit( 1 );
}
memset( crtcs, 0, sizeof( struct crtcinfo ) * ncrtc);
for ( i = 0; i < ncrtc; i++ )
{
ci = XRRGetCrtcInfo( display, sr, sr->crtcs[i] );
if ( ci == NULL )
continue;
if ( ci->noutput != 0 )
{
crtcs[i].x = ci->x;
crtcs[i].y = ci->y;
crtcs[i].w = ci->width;
crtcs[i].h = ci->height;
}
XRRFreeCrtcInfo( ci );
}
XRRFreeScreenResources( sr );
}
static void
xrrcleanup( void )
{
if ( ! hasrandr )
return;
free( crtcs );
crtcs = NULL;
}
/* make_star_tiles - make random star tiles */
/* Define some stars. */
#define star1_width 1
#define star1_height 1
static char star1_bits[] = { 0x00 };
#define star2_width 2
#define star2_height 2
static char star2_bits[] = { 0x00, 0x00 };
#define star3a_width 3
#define star3a_height 3
static char star3a_bits[] = { 0x05, 0x00, 0x05 };
#define star3b_width 3
#define star3b_height 3
static char star3b_bits[] = { 0x05, 0x02, 0x05 };
#define star4a_width 4
#define star4a_height 4
static char star4a_bits[] = { 0x09, 0x00, 0x00, 0x09 };
#define star4b_width 4
#define star4b_height 4
static char star4b_bits[] = { 0x0b, 0x08, 0x01, 0x0d };
#define star4c_width 4
#define star4c_height 4
static char star4c_bits[] = { 0x0d, 0x01, 0x08, 0x0b };
#define star5a_width 5
#define star5a_height 5
static char star5a_bits[] = { 0x11, 0x00, 0x00, 0x00, 0x11 };
#define star5b_width 5
#define star5b_height 5
static char star5b_bits[] = { 0x1b, 0x11, 0x00, 0x11, 0x1b };
#define NUM_STARS 9
static int star_w[NUM_STARS] = {
star1_width, star2_width, star3a_width, star3b_width, star4a_width,
star4b_width, star4c_width, star5a_width, star5b_width };
static int star_h[NUM_STARS] = {
star1_height, star2_height, star3a_height, star3b_height, star4a_height,
star4b_height, star4c_height, star5a_height, star5b_height };
static char* star_bits[NUM_STARS] = {
star1_bits, star2_bits, star3a_bits, star3b_bits, star4a_bits,
star4b_bits, star4c_bits, star5a_bits, star5b_bits };
static int star_prob[NUM_STARS] = { 700, 60, 15, 15, 6, 6, 6, 2, 2 };
/* 1 2 3a 3b 4a 4b 4c 5a 5b */
#define NUM_TILES 20
#define TILE_SIZE 128
#define STARS_PER_TILE 40
static Pixmap star_tile[NUM_TILES];
static int star_tiles_made = 0;
static void
make_star_tiles()
{
int i, j, k, r, x, y;
int total_prob;
Pixmap star_pixmap[NUM_STARS];
total_prob = 0;
for ( i = 0; i < NUM_STARS; ++i )
{
star_pixmap[i] = XCreateBitmapFromData(
display, root, star_bits[i], star_w[i], star_h[i] );
total_prob += star_prob[i];
}
for ( i = 0; i < NUM_TILES; ++i )
{
star_tile[i] = XCreatePixmap( display, root, TILE_SIZE, TILE_SIZE, 1 );
XFillRectangle(
display, star_tile[i], onegc, 0, 0, TILE_SIZE, TILE_SIZE );
for ( j = random() % STARS_PER_TILE + STARS_PER_TILE / 2; j > 0; --j )
{
r = random() % total_prob;
for ( k = 0; k < NUM_STARS; ++k )
{
r -= star_prob[k];
if ( r < 0 )
{
x = random() % ( TILE_SIZE - star_w[k] );
y = random() % ( TILE_SIZE - star_h[k] );
XCopyArea(
display, star_pixmap[k], star_tile[i], onegc, 0, 0,
star_w[k], star_h[k], x, y );
break;
}
}
}
}
for ( i = 0; i < NUM_STARS; ++i )
XFreePixmap( display, star_pixmap[i] );
star_tiles_made = 1;
}
/* byte_flip - invert the order of the bits in a char - by Lalo Martins */
char
byte_flip( orig_bits )
char orig_bits;
{
int i;
char res;
res = 0;
for ( i = 0; i < CHAR_BIT; i++ )
{
res |= ( ( 1 & ( orig_bits >> i ) ) << ( CHAR_BIT - ( i + 1 ) ) );
}
return (res);
}
/* hack_bits - modify the moon bitmap for the current phase */
static char leftmask[8] = { 0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80 };
static char rightmask[8] = { 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f };
static char shade_0_bits[] = { 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff };
static char shade_1_bits[] = { 0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff };
static char shade_2_bits[] = { 0xfe,0xff,0xfb,0xff,0xff,0xff,0xff,0xff };
static char shade_3_bits[] = { 0xfe,0xff,0xfb,0xff,0x7f,0xff,0xff,0xff };
static char shade_4_bits[] = { 0xfe,0xff,0xfb,0xff,0x7f,0xff,0xff,0xef };
static char shade_5_bits[] = { 0xfe,0xbf,0xfb,0xff,0x7f,0xff,0xff,0xef };
static char shade_6_bits[] = { 0xfe,0xbf,0xfb,0xdf,0x7f,0xff,0xff,0xef };
static char shade_7_bits[] = { 0xfe,0xbf,0xfb,0xdf,0x7f,0xff,0xfe,0xef };
static char shade_8_bits[] = { 0xfe,0xbf,0xfb,0xdf,0x7f,0xdf,0xfe,0xef };
static char shade_9_bits[] = { 0xfe,0xbf,0xfb,0xdf,0x7d,0xdf,0xfe,0xef };
static char shade_10_bits[] = { 0xfe,0xbf,0xfb,0xdf,0x7d,0xdf,0xfa,0xef };
static char shade_11_bits[] = { 0xfe,0xbf,0xfb,0xdf,0x7d,0xdf,0xfa,0xaf };
static char shade_12_bits[] = { 0xfe,0xbf,0xfa,0xdf,0x7d,0xdf,0xfa,0xaf };
static char shade_13_bits[] = { 0xfe,0xaf,0xfa,0xdf,0x7d,0xdf,0xfa,0xaf };
static char shade_14_bits[] = { 0xfe,0xaf,0xfa,0xdf,0x75,0xdf,0xfa,0xaf };
static char shade_15_bits[] = { 0xfa,0xaf,0xfa,0xdf,0x75,0xdf,0xfa,0xaf };
char *shades[16] = {
shade_0_bits, shade_1_bits, shade_2_bits, shade_3_bits,
shade_4_bits, shade_5_bits, shade_6_bits, shade_7_bits,
shade_8_bits, shade_9_bits, shade_10_bits, shade_11_bits,
shade_12_bits, shade_13_bits, shade_14_bits, shade_15_bits };
#define PI 3.14159265358979323846 /* assume not near black hole or in
Tennessee */
static void
hack_bits( t, bits_w, bits_h, bits, cx, cy, r, blackflag, demoflag, southflag )
struct tws* t;
int bits_w, bits_h;
char* bits;
int cx, cy, r;
int blackflag, demoflag, southflag;
{
double jd, angphase, cphase, aom, cdist, cangdia, csund, csuang;
int i;
register int x, y;
int xleft, xright;
double fxleft, fxright;
double fy;
int bytexleft, bitxleft, bytexright, bitxright;
int off;
int oppoff;
double cap, ratio;
int shadeindex;
char shade;
char bit_tmp;
static double demoinc = 0.0;
jd = jtime( t );
if ( demoflag )
{
/* Jump ahead a day each time through. */
jd += demoinc;
demoinc += 1.0;
}
angphase = phase( jd, &cphase, &aom, &cdist, &cangdia, &csund, &csuang );
cap = cos( angphase );
/* Hack to figure approximate earthlighting. */
if ( cphase < 0.1 ) cphase = 0.1;
if ( cphase > 0.9 ) cphase = 0.9;
ratio = (1.0 - cphase) / cphase; /* ratio varies from 9.0 to 0.111 */
shadeindex = (int) ( ratio / 9.0 * 15.9999 );
for ( i = 0; i < 2 * r; ++i )
{
y = cy - r + i;
if ( y < 0 || y >= bits_h )
continue;
fy = i - r;
fxright = r * sqrt( 1.0 - ( fy * fy ) / ( r * r ) );
fxleft = - fxright;
if ( angphase >= 0.0 && angphase < PI )
fxright *= cap;
else
fxleft *= cap;
xleft = fxleft + cx + 0.5;
xright = fxright + cx + 0.5;
bytexleft = xleft / 8;
bitxleft = xleft % 8;
bytexright = xright / 8;
bitxright = xright % 8;
off = y * ( ( bits_w + 7 ) / 8 );
if ( blackflag )
shade = 0xff;
else
shade = shades[shadeindex][y % 8];
if ( bytexleft == bytexright )
bits[bytexleft + off] |=
leftmask[bitxleft] & shade & rightmask[bitxright];
else
{
bits[bytexleft + off] |= leftmask[bitxleft] & shade;
for ( x = bytexleft + 1; x < bytexright; ++x )
bits[x + off] |= shade;
bits[bytexright + off] |= rightmask[bitxright] & shade;
}
}
if ( southflag )
{
for ( y = 0; y < bits_h; y++ )
{
for ( x = 0; x <= ( ( bits_w + 7 ) / 2 ); x+= 8 )
{
if ( ( ( x / 8 ) == ( bits_w - 1 - x ) / 8 ) &&
( y > ( bits_h / 2 ) ) )
continue;
off = ( y * ( ( bits_w + 7 ) / 8 ) ) + ( x / 8 );
oppoff = ( ( bits_h - 1 - y ) * ( ( bits_w + 7 ) / 8 ) ) +
( (bits_w - 1 - x) / 8 );
/* Very good for debugging :-)
fprintf ( stderr, "Swapping %d (%d, %d) with %d (%d, %d) of "
"%d (%d, %d) ((%d * %d) + %d)\n",
off, x, y, oppoff, bits_w - 1 - x, bits_h - 1 - y,
BitmapSize (bits_w, bits_h) - 1, bits_w - 1,
bits_h - 1, bits_h - 1 - y, ( bits_w + 7 ) / 8,
( bits_w - 1 - x ) / 8);
*/
bit_tmp = bits[oppoff];
bits[oppoff] = byte_flip ( bits[off] );
bits[off] = byte_flip ( bit_tmp );
}
}
}
}
/* set_root - set the root bitmap */
static void
set_root( bits_w, bits_h, bits, cx, cy, r )
int bits_w, bits_h;
char* bits;
int cx, cy, r;
{
Pixmap moon_bitmap;
Pixmap mask_bitmap;
Pixmap root_pixmap;
int x, y, i;
unsigned long length, after;
int format;
Atom prop, type;
unsigned char* data;
XEvent event;
/* Read and discard any events, not that there should be any. */
while (XPending (display))
XNextEvent (display, &event);
/* Send the moon bitmap to the server. */
moon_bitmap = XCreateBitmapFromData( display, root, bits, bits_w, bits_h );
if ( moon_bitmap == (Pixmap) 0 )
{
(void) fprintf( stderr, "%s: unable to store moon bitmap", argv0 );
exit( 1 );
}
/* Make the mask bitmap. */
mask_bitmap = XCreatePixmap( display, root, bits_w, bits_h, 1 );
if ( mask_bitmap == (Pixmap) 0 )
{
(void) fprintf( stderr, "%s: unable to create mask bitmap", argv0 );
exit( 1 );
}
XFillRectangle( display, mask_bitmap, zerogc, 0, 0, bits_w, bits_h );
/* Draw the mask smaller than r, to allow for slop. */
XFillArc(
display, mask_bitmap, onegc, cx - r + 2, cy - r + 2,
r * 2 - 3, r * 2 - 3, 0, 360 * 64 );
xrrinit();
/* Make the root pixmap. */
root_pixmap = XCreatePixmap(
display, root, root_w, root_h, DefaultDepth( display, screen ) );
if ( root_pixmap == (Pixmap) 0 )
{
(void) fprintf( stderr, "%s: unable to create root pixmap", argv0 );
exit( 1 );
}
/* Fill in root pixmap with randomly-chosen star tiles. */
srandom( seed );
for ( y = 0; y < root_h; y += TILE_SIZE )
for ( x = 0; x < root_w; x += TILE_SIZE )
XCopyPlane(
display, star_tile[random() % NUM_TILES], root_pixmap, copygc,
0, 0, TILE_SIZE, TILE_SIZE, x, y, 1 );
/* And just for good measure, add some with random x and y. */
for ( i = ( root_w * root_h ) / ( TILE_SIZE * TILE_SIZE ) / 5; i > 0; --i )
{
x = random() % ( root_w - TILE_SIZE );
y = random() % ( root_h - TILE_SIZE );
XCopyPlane(
display, star_tile[random() % NUM_TILES], root_pixmap, copygc,
0, 0, TILE_SIZE, TILE_SIZE, x, y, 1 );
}
/* Put the moon into the stars. */
for ( i = 0; i < ncrtc; i++ )
{
if ( crtcs[i].w == 0 )
continue;
x = crtcs[i].x + ( ( crtcs[i].w - bits_w ) / 2 );
y = crtcs[i].y + ( ( crtcs[i].h - bits_h ) / 2 );
XSetClipMask( display, clipgc, mask_bitmap );
XSetClipOrigin( display, clipgc, x, y );
XCopyPlane(
display, moon_bitmap, root_pixmap, clipgc, 0, 0, bits_w, bits_h,
x, y, 1 );
}
xrrcleanup();
/* And set the root. */
XSetWindowBackgroundPixmap( display, root, root_pixmap );
/* Clean up. */
XFreePixmap( display, moon_bitmap );
XFreePixmap( display, mask_bitmap );
XFreePixmap( display, root_pixmap );
XClearWindow( display, root );
XFlush( display );
/* Not sure what this garbage does, but xsetroot has it, so... */
prop = XInternAtom( display, "_XSETROOT_ID", False );
(void) XGetWindowProperty(
display, root, prop, 0L, 1L, True, AnyPropertyType, &type, &format,
&length, &after, &data );
if ( type == XA_PIXMAP && format == 32 && length == 1 && after == 0 )
XKillClient( display, *( (Pixmap*) data ) );
else if ( type != None )
(void) fprintf(
stderr, "%s: warning: _XSETROOT_ID property is garbage\n", argv0 );
if (data)
free(data);
XFlush( display );
}
static void
cleanup()
{
int i;
if ( star_tiles_made )
for ( i = 0; i < NUM_TILES; ++i )
XFreePixmap( display, star_tile[i] );
if ( ! hasrandr )
free( crtcs );
XFreeGC( display, onegc );
XFreeGC( display, zerogc );
XFreeGC( display, copygc );
XFreeGC( display, clipgc );
XCloseDisplay( display );
}
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