+++ /dev/null
-/* coral, by "Frederick G.M. Roeber" <roeber@netscape.com>, 15-jul-97.
- *
- * 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"
-#include "colors.h"
-#include "erase.h"
-
-static GC draw_gc, erase_gc;
-static unsigned int default_fg_pixel;
-#define NCOLORSMAX 200
-static XColor colors[NCOLORSMAX];
-static int ncolors = 0;
-static int colorindex = 0;
-static int colorsloth;
-
-static XPoint *walkers = 0;
-static int nwalkers;
-static int width, widthb;
-static int height;
-
-static unsigned int *board = 0;
-#define getdot(x,y) (board[(y*widthb)+(x>>5)] & (1<<(x & 31)))
-#define setdot(x,y) (board[(y*widthb)+(x>>5)] |= (1<<(x & 31)))
-
-
-static void
-init_coral(Display *dpy, Window window)
-{
- XGCValues gcv;
- Colormap cmap;
- XWindowAttributes xgwa;
- Bool writeable = False;
- int seeds;
- int density;
- int i;
-
- XClearWindow(dpy, window);
- XGetWindowAttributes(dpy, window, &xgwa);
- width = xgwa.width;
- widthb = ((xgwa.width + 31) >> 5);
- height = xgwa.height;
- if (board) free(board);
- board = (unsigned int *)calloc(widthb * xgwa.height, sizeof(unsigned int));
- if(!board) exit(1);
- cmap = xgwa.colormap;
- if( ncolors ) {
- free_colors(dpy, cmap, colors, ncolors);
- ncolors = 0;
- }
- gcv.foreground = default_fg_pixel = get_pixel_resource("foreground", "Foreground", dpy, cmap);
- draw_gc = XCreateGC(dpy, window, GCForeground, &gcv);
- gcv.foreground = get_pixel_resource ("background", "Background",dpy, cmap);
- erase_gc = XCreateGC (dpy, window, GCForeground, &gcv);
- ncolors = NCOLORSMAX;
- make_uniform_colormap(dpy, xgwa.visual, cmap, colors, &ncolors, True, &writeable, False);
- if (ncolors <= 0) {
- ncolors = 2;
- colors[0].red = colors[0].green = colors[0].blue = 0;
- colors[1].red = colors[1].green = colors[1].blue = 0xFFFF;
- XAllocColor(dpy, cmap, &colors[0]);
- XAllocColor(dpy, cmap, &colors[1]);
- }
- colorindex = random()%ncolors;
-
- density = get_integer_resource("density", "Integer");
- if( density < 1 ) density = 1;
- if( density > 100 ) density = 90; /* more like mold than coral */
- nwalkers = (width*height*density)/100;
- if (walkers) free(walkers);
- walkers = (XPoint *)calloc(nwalkers, sizeof(XPoint));
- if( (XPoint *)0 == walkers ) exit(1);
-
- seeds = get_integer_resource("seeds", "Integer");
- if( seeds < 1 ) seeds = 1;
- if( seeds > 1000 ) seeds = 1000;
-
- colorsloth = nwalkers*2/ncolors;
- XSetForeground(dpy, draw_gc, colors[colorindex].pixel);
-
- for( i = 0; i < seeds; i++ ) {
- int x, y;
- do {
- x = random() % width;
- y = random() % height;
- } while( getdot(x, y) );
-
- setdot((x-1), (y-1)); setdot(x, (y-1)); setdot((x+1), (y-1));
- setdot((x-1), y ); setdot(x, y ); setdot((x+1), y );
- setdot((x-1), (y+1)); setdot(x, (y+1)); setdot((x+1), (y+1));
- XDrawPoint(dpy, window, draw_gc, x, y);
- }
-
- for( i = 0; i < nwalkers; i++ ) {
- walkers[i].x = (random() % (width-2)) + 1;
- walkers[i].y = (random() % (height-2)) + 1;
- }
-}
-
-
-/* returns 2 bits of randomness (conserving calls to random()).
- This speeds things up a little, but not a lot (5-10% or so.)
- */
-static int
-rand_2(void)
-{
- static int i = 0;
- static int r = 0;
- if (i != 0) {
- i--;
- } else {
- i = 15;
- r = random();
- }
-
- {
- register int j = (r & 3);
- r = r >> 2;
- return j;
- }
-}
-
-
-static void
-coral(Display *dpy, Window window)
-{
- int delay2 = get_integer_resource ("delay2", "Integer");
-
- int max_points = 200;
- int npoints = 0;
- XPoint *pointbuf = (XPoint *) calloc(sizeof(XPoint), max_points+2);
- if (!pointbuf) exit(-1);
-
- while( 1 ) {
- int i;
-
- for( i = 0; i < nwalkers; i++ ) {
- int x = walkers[i].x;
- int y = walkers[i].y;
-
- if( getdot(x, y) ) {
-
- Bool flush = False;
- Bool color = False;
-
- /* XDrawPoint(dpy, window, draw_gc, x, y); */
- pointbuf[npoints].x = x;
- pointbuf[npoints].y = y;
- npoints++;
-
- /* Mark the surrounding area as "sticky" */
- setdot((x-1), (y-1)); setdot(x, (y-1)); setdot((x+1), (y-1));
- setdot((x-1), y ); setdot((x+1), y );
- setdot((x-1), (y+1)); setdot(x, (y+1)); setdot((x+1), (y+1));
- nwalkers--;
- walkers[i].x = walkers[nwalkers].x;
- walkers[i].y = walkers[nwalkers].y;
- if( 0 == (nwalkers%colorsloth) ) {
- color = True;
- }
-
- if (flush || color || 0 == nwalkers || npoints >= max_points) {
- XDrawPoints(dpy, window, draw_gc, pointbuf, npoints,
- CoordModeOrigin);
- npoints = 0;
- XSync(dpy, False);
- }
-
- if (color) {
- colorindex++;
- if( colorindex == ncolors )
- colorindex = 0;
- XSetForeground(dpy, draw_gc, colors[colorindex].pixel);
- }
-
- if( 0 == nwalkers ) {
- XSync(dpy, False);
- free(pointbuf);
- return;
- }
- } else {
- /* move it a notch */
- do {
- switch(rand_2()) {
- case 0:
- if( 1 == x ) continue;
- walkers[i].x--;
- break;
- case 1:
- if( width-2 == x ) continue;
- walkers[i].x++;
- break;
- case 2:
- if( 1 == y ) continue;
- walkers[i].y--;
- break;
- default: /* case 3: */
- if( height-2 == y ) continue;
- walkers[i].y++;
- break;
- /* default:
- abort(); */
- }
- } while(0);
- }
- }
-
- if (delay2 > 0) {
- if (npoints > 0) {
- XDrawPoints(dpy, window, draw_gc, pointbuf, npoints,
- CoordModeOrigin);
- npoints = 0;
- XSync(dpy, False);
- }
- screenhack_handle_events (dpy);
- usleep(delay2);
- }
- }
-}
-
-char *progclass = "Coral";
-
-char *defaults[] = {
- ".background: black",
- ".foreground: white",
- "*density: 25",
- "*seeds: 20", /* too many for 640x480, too few for 1280x1024 */
- "*delay: 5",
- "*delay2: 1000",
- 0
-};
-
-XrmOptionDescRec options[] = {
- { "-density", ".density", XrmoptionSepArg, 0 },
- { "-seeds", ".seeds", XrmoptionSepArg, 0 },
- { "-delay", ".delay", XrmoptionSepArg, 0 },
- { "-delay2", ".delay2", XrmoptionSepArg, 0 },
- { 0, 0, 0, 0 }
-};
-
-void
-screenhack(dpy, window)
-Display *dpy;
-Window window;
-{
- int delay = get_integer_resource ("delay", "Integer");
- while( 1 ) {
- init_coral(dpy, window);
- coral(dpy, window);
- screenhack_handle_events (dpy);
- if( delay ) sleep(delay);
- erase_full_window(dpy, window);
- }
-}
projects / xscreensaver / blobdiff