+++ /dev/null
-/* 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
- * 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.
- */
-
-/* decayscreen
- *
- * Based on slidescreen program from the xscreensaver application and the
- * decay program for Sun framebuffers. This is the comment from the decay.c
- * file:
-
- * decay.c
- * find the screen bitmap for the console and make it "decay" by
- * randomly shifting random rectangles by one pixelwidth at a time.
- *
- * by David Wald, 1988
- * rewritten by Natuerlich!
- * based on a similar "utility" on the Apollo ring at Yale.
-
- * X version by
- *
- * 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
-
-static void
-init_decay (Display *dpy, Window window)
-{
- XGCValues gcv;
- XWindowAttributes xgwa;
- 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 && *s && !!strcmp(s, "random"))
- fprintf(stderr, "%s: unknown mode %s\n", progname, s);
- mode = random() % (STRETCH+1);
- }
-
- delay = get_integer_resource ("delay", "Integer");
-
- if (delay < 0) delay = 0;
-
- XGetWindowAttributes (dpy, window, &xgwa);
-
- gcv.function = GXcopy;
- gcv.subwindow_mode = IncludeInferiors;
-
- 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;
-
- grab_screen_image (xgwa.screen, window);
-
- 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 (Display *dpy, Window window)
-{
- 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;
- default: abort();
- }
-
-#define nrnd(x) (random() % (x))
-
- 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 {
-
- 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);
- }
-
-#undef nrnd
-}
-
-\f
-char *progclass = "DecayScreen";
-
-char *defaults [] = {
- "*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 }
-};
-
-void
-screenhack (Display *dpy, Window window)
-{
- init_decay (dpy, window);
- while (1) {
- int i;
- for (i = 0; i < iterations; i++)
- decay1 (dpy, window);
- XSync(dpy, False);
- screenhack_handle_events (dpy);
- if (delay) usleep (delay);
- }
-}
projects / xscreensaver / blobdiff