-/* xscreensaver, Copyright (c) 1992, 1993, 1994 Jamie Zawinski <jwz@mcom.com>
+/* xscreensaver, Copyright (c) 1992, 1993, 1994, 1996, 1997
+ * 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
*
* Vivek Khera <khera@cs.duke.edu>
* 5-AUG-1993
+ *
+ * Hacked by jwz, 28-Nov-97 (sped up and added new motion directions)
+
+ * R. Schultz
+ * Added "melt" & "stretch" modes 28-Mar-1999
+ *
*/
#include "screenhack.h"
static int sizex, sizey;
static int delay;
static GC gc;
+static int mode;
+static int iterations=100;
+
+#define SHUFFLE 0
+#define UP 1
+#define LEFT 2
+#define RIGHT 3
+#define DOWN 4
+#define UPLEFT 5
+#define DOWNLEFT 6
+#define UPRIGHT 7
+#define DOWNRIGHT 8
+#define IN 9
+#define OUT 10
+#define MELT 11
+#define STRETCH 12
+#define FUZZ 13
static void
-init_decay (dpy, window)
- Display *dpy;
- Window window;
+init_decay (Display *dpy, Window window)
{
XGCValues gcv;
XWindowAttributes xgwa;
- int root_p;
- Pixmap pixmap;
+ long gcflags;
+ unsigned long bg;
+
+ char *s = get_string_resource("mode", "Mode");
+ if (s && !strcmp(s, "shuffle")) mode = SHUFFLE;
+ else if (s && !strcmp(s, "up")) mode = UP;
+ else if (s && !strcmp(s, "left")) mode = LEFT;
+ else if (s && !strcmp(s, "right")) mode = RIGHT;
+ else if (s && !strcmp(s, "down")) mode = DOWN;
+ else if (s && !strcmp(s, "upleft")) mode = UPLEFT;
+ else if (s && !strcmp(s, "downleft")) mode = DOWNLEFT;
+ else if (s && !strcmp(s, "upright")) mode = UPRIGHT;
+ else if (s && !strcmp(s, "downright")) mode = DOWNRIGHT;
+ else if (s && !strcmp(s, "in")) mode = IN;
+ else if (s && !strcmp(s, "out")) mode = OUT;
+ else if (s && !strcmp(s, "melt")) mode = MELT;
+ else if (s && !strcmp(s, "stretch")) mode = STRETCH;
+ else if (s && !strcmp(s, "fuzz")) mode = FUZZ;
+ else {
+ if (s && *s && !!strcmp(s, "random"))
+ fprintf(stderr, "%s: unknown mode %s\n", progname, s);
+ mode = random() % (FUZZ+1);
+ }
delay = get_integer_resource ("delay", "Integer");
- root_p = get_boolean_resource ("root", "Boolean");
if (delay < 0) delay = 0;
+ XGetWindowAttributes (dpy, window, &xgwa);
+
gcv.function = GXcopy;
gcv.subwindow_mode = IncludeInferiors;
- gc = XCreateGC (dpy, window, GCForeground |GCFunction | GCSubwindowMode,
- &gcv);
- XGetWindowAttributes (dpy, window, &xgwa);
+ if (mode == MELT || mode == STRETCH) {
+ bg = get_pixel_resource ("background", "Background", dpy, xgwa.colormap);
+ gcv.foreground = bg;
+ }
+
+ gcflags = GCForeground |GCFunction;
+ if (use_subwindow_mode_p(xgwa.screen, window)) /* see grabscreen.c */
+ gcflags |= GCSubwindowMode;
+ gc = XCreateGC (dpy, window, gcflags, &gcv);
+
sizex = xgwa.width;
sizey = xgwa.height;
- copy_default_colormap_contents (dpy, xgwa.colormap, xgwa.visual);
- pixmap = grab_screen_image (dpy, window, root_p);
+ load_random_image (xgwa.screen, window, window, NULL);
+
+ if (mode == MELT || mode == STRETCH) {
+ /* make sure screen eventually turns background color */
+ XDrawLine(dpy, window, gc, 0, 0, sizex, 0);
+
+ /* slow down for smoother melting*/
+ iterations = 1;
+ }
+
}
* perform one iteration of decay
*/
static void
-decay1 (dpy, window)
- Display *dpy;
- Window window;
+decay1 (Display *dpy, Window window)
{
- int left, top, width, height;
+ int left, top, width, height, toleft, totop;
+
+#define L 101
+#define R 102
+#define U 103
+#define D 104
+ static int no_bias[] = { L,L,L,L, R,R,R,R, U,U,U,U, D,D,D,D };
+ static int up_bias[] = { L,L,L,L, R,R,R,R, U,U,U,U, U,U,D,D };
+ static int down_bias[] = { L,L,L,L, R,R,R,R, U,U,D,D, D,D,D,D };
+ static int left_bias[] = { L,L,L,L, L,L,R,R, U,U,U,U, D,D,D,D };
+ static int right_bias[] = { L,L,R,R, R,R,R,R, U,U,U,U, D,D,D,D };
+
+ static int upleft_bias[] = { L,L,L,L, L,R,R,R, U,U,U,U, U,D,D,D };
+ static int downleft_bias[] = { L,L,L,L, L,R,R,R, U,U,U,D, D,D,D,D };
+ static int upright_bias[] = { L,L,L,R, R,R,R,R, U,U,U,U, U,D,D,D };
+ static int downright_bias[] = { L,L,L,R, R,R,R,R, U,U,U,D, D,D,D,D };
+ static int *bias;
+
+ switch (mode) {
+ case SHUFFLE: bias = no_bias; break;
+ case UP: bias = up_bias; break;
+ case LEFT: bias = left_bias; break;
+ case RIGHT: bias = right_bias; break;
+ case DOWN: bias = down_bias; break;
+ case UPLEFT: bias = upleft_bias; break;
+ case DOWNLEFT: bias = downleft_bias; break;
+ case UPRIGHT: bias = upright_bias; break;
+ case DOWNRIGHT: bias = downright_bias; break;
+ case IN: bias = no_bias; break;
+ case OUT: bias = no_bias; break;
+ case MELT: bias = no_bias; break;
+ case STRETCH: bias = no_bias; break;
+ case FUZZ: bias = no_bias; break;
+ default: abort();
+ }
#define nrnd(x) (random() % (x))
- switch (random() % 8) {
- case 0: /* move a block left */
- case 1:
- left = nrnd(sizex - 1) + 1;
- top = nrnd(sizey);
- width = nrnd(sizex - left);
- height = nrnd(sizey - top);
- XCopyArea (dpy, window, window, gc, left, top, width, height,
- left - 1, top);
- break;
- case 2: /* move a block right */
- case 3:
- left = nrnd(sizex - 1);
- top = nrnd(sizey);
- width = nrnd(sizex - 1 - left);
- height = nrnd(sizey - top);
- XCopyArea (dpy, window, window, gc, left, top, width, height,
- left + 1, top);
- break;
- case 4: /* move a block up */
- left = nrnd(sizex);
- top = nrnd(sizey - 1) + 1;
- width = nrnd(sizex - left);
- height = nrnd(sizey - top);
- XCopyArea (dpy, window, window, gc, left, top, width, height,
- left, top - 1);
- break;
- default: /* move block down (biased to this) */
- left = nrnd(sizex);
- top = nrnd(sizey - 1);
- width = nrnd(sizex - left);
- height = nrnd(sizey - 1 - top);
- XCopyArea (dpy, window, window, gc, left, top, width, height,
- left, top + 1);
- break;
+ if (mode == MELT || mode == STRETCH) {
+ left = nrnd(sizex/2);
+ top = nrnd(sizey);
+ width = nrnd( sizex/2 ) + sizex/2 - left;
+ height = nrnd(sizey - top);
+ toleft = left;
+ totop = top+1;
+
+ } else if (mode == FUZZ) { /* By Vince Levey <vincel@vincel.org>;
+ inspired by the "melt" mode of the
+ "scrhack" IrisGL program by Paul Haeberli
+ circa 1991. */
+ static int toggle = 0;
+
+ left = nrnd(sizex - 1);
+ top = nrnd(sizey - 1);
+ toggle = !toggle;
+ if (toggle)
+ {
+ totop = top;
+ height = 1;
+ toleft = nrnd(sizex - 1);
+ if (toleft > left)
+ {
+ width = toleft-left;
+ toleft = left;
+ left++;
+ }
+ else
+ {
+ width = left-toleft;
+ left = toleft;
+ toleft++;
+ }
+ }
+ else
+ {
+ toleft = left;
+ width = 1;
+ totop = nrnd(sizey - 1);
+ if (totop > top)
+ {
+ height = totop-top;
+ totop = top;
+ top++;
+ }
+ else
+ {
+ height = top-totop;
+ top = totop;
+ totop++;
+ }
+ }
+
+ } else {
+
+ left = nrnd(sizex - 1);
+ top = nrnd(sizey);
+ width = nrnd(sizex - left);
+ height = nrnd(sizey - top);
+
+ toleft = left;
+ totop = top;
+ if (mode == IN || mode == OUT) {
+ int x = left+(width/2);
+ int y = top+(height/2);
+ int cx = sizex/2;
+ int cy = sizey/2;
+ if (mode == IN) {
+ if (x > cx && y > cy) bias = upleft_bias;
+ else if (x < cx && y > cy) bias = upright_bias;
+ else if (x < cx && y < cy) bias = downright_bias;
+ else /* (x > cx && y < cy)*/ bias = downleft_bias;
+ } else {
+ if (x > cx && y > cy) bias = downright_bias;
+ else if (x < cx && y > cy) bias = downleft_bias;
+ else if (x < cx && y < cy) bias = upleft_bias;
+ else /* (x > cx && y < cy)*/ bias = upright_bias;
+ }
+ }
+
+ switch (bias[random() % (sizeof(no_bias)/sizeof(*no_bias))]) {
+ case L: toleft = left-1; break;
+ case R: toleft = left+1; break;
+ case U: totop = top-1; break;
+ case D: totop = top+1; break;
+ default: abort(); break;
+ }
+ }
+
+ if (mode == STRETCH) {
+ XCopyArea (dpy, window, window, gc, 0, sizey-top-2, sizex, top+1,
+ 0, sizey-top-1);
+ } else {
+ XCopyArea (dpy, window, window, gc, left, top, width, height,
+ toleft, totop);
}
- XSync (dpy, True);
+
#undef nrnd
}
char *progclass = "DecayScreen";
char *defaults [] = {
- "DecayScreen.mappedWhenManaged:false",
- "DecayScreen.dontClearWindow: true",
- "*delay: 10",
+ "*dontClearRoot: True",
+
+#ifdef __sgi /* really, HAVE_READ_DISPLAY_EXTENSION */
+ "*visualID: Best",
+#endif
+
+ "*delay: 10000",
+ "*mode: random",
0
};
XrmOptionDescRec options [] = {
{ "-delay", ".delay", XrmoptionSepArg, 0 },
+ { "-mode", ".mode", XrmoptionSepArg, 0 },
+ { 0, 0, 0, 0 }
};
-int options_size = (sizeof (options) / sizeof (options[0]));
-
void
-screenhack (dpy, window)
- Display *dpy;
- Window window;
+screenhack (Display *dpy, Window window)
{
init_decay (dpy, window);
while (1) {
+ int i;
+ for (i = 0; i < iterations; i++)
decay1 (dpy, window);
- if (delay) usleep (delay);
+ XSync(dpy, False);
+ screenhack_handle_events (dpy);
+ if (delay) usleep (delay);
}
}
projects / xscreensaver / blobdiff