+++ /dev/null
-/* -*- Mode: C; tab-width: 4 -*-
- * slip --- lots of blits.
- */
-#if !defined( lint ) && !defined( SABER )
-static const char sccsid[] = "@(#)slip.c 4.00 97/01/01 xlockmore";
-#endif
-
-/* Copyright (c) 1992 by Scott Draves (spot@cs.cmu.edu)
- *
- * 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 file is provided AS IS with no warranties of any kind. The author
- * shall have no liability with respect to the infringement of copyrights,
- * trade secrets or any patents by this file or any part thereof. In no
- * event will the author be liable for any lost revenue or profits or
- * other special, indirect and consequential damages.
- *
- * Revision History:
- * 12-May-97: jwz@jwz.org: turned into a standalone program.
- * 01-Dec-95: Patched for VMS <joukj@alpha.chem.uva.nl>.
- */
-
-#ifdef STANDALONE
-# define PROGCLASS "Slip"
-# define HACK_INIT init_slip
-# define HACK_DRAW draw_slip
-# define slip_opts xlockmore_opts
-# define DEFAULTS "*count: 35 \n" \
- "*cycles: 50 \n" \
- "*delay: 50000 \n" \
- "*ncolors: 200 \n"
-# include "xlockmore.h" /* from the xscreensaver distribution */
-#else /* !STANDALONE */
-# include "xlock.h" /* from the xlockmore distribution */
-#endif /* !STANDALONE */
-
-ModeSpecOpt slip_opts = {
- 0, NULL, 0, NULL, NULL };
-
-typedef struct {
- int width, height;
- int nblits_remaining;
- int blit_width, blit_height;
- int mode;
- int first_time;
- int backwards;
-} slipstruct;
-static slipstruct *slips = NULL;
-
-static short
-halfrandom(int mv)
-{
- static short lasthalf = 0;
- unsigned long r;
-
- if (lasthalf) {
- r = lasthalf;
- lasthalf = 0;
- } else {
- r = LRAND();
- lasthalf = r >> 16;
- }
- return r % mv;
-}
-
-static int
-erandom(int mv)
-{
- static int stage = 0;
- static unsigned long r;
- int res;
-
- if (0 == stage) {
- r = LRAND();
- stage = 7;
- }
- res = r & 0xf;
- r = r >> 4;
- stage--;
- if (res & 8)
- return res & mv;
- else
- return -(res & mv);
-}
-
-static void
-prepare_screen(ModeInfo * mi, slipstruct * s)
-{
-
- Display *display = MI_DISPLAY(mi);
- GC gc = MI_GC(mi);
- int i, n, w = s->width / 20;
- int not_solid = halfrandom(10);
-
-#ifdef STANDALONE /* jwz -- sometimes hack the desktop image! */
- if (halfrandom(2) == 0)
- {
- grab_screen_image(DefaultScreenOfDisplay (MI_DISPLAY(mi)),
- MI_WINDOW(mi));
- return;
- }
-#endif
-
- s->backwards = LRAND() & 1; /* jwz: go the other way sometimes */
-
- if (s->first_time || (0 == halfrandom(10))) {
- XClearWindow(display, MI_WINDOW(mi));
- n = 300;
- } else {
- if (halfrandom(5))
- return;
- if (halfrandom(5))
- n = 100;
- else
- n = 2000;
- }
-
- if (MI_NPIXELS(mi) > 2)
- XSetForeground(display, gc, MI_PIXEL(mi, halfrandom(MI_NPIXELS(mi))));
- else if (halfrandom(2))
- XSetForeground(display, gc, MI_WIN_WHITE_PIXEL(mi));
- else
- XSetForeground(display, gc, MI_WIN_BLACK_PIXEL(mi));
-
- for (i = 0; i < n; i++) {
- int ww = ((w/2) + halfrandom(w));
- if (not_solid)
- if (MI_NPIXELS(mi) > 2)
- XSetForeground(display, gc, MI_PIXEL(mi, halfrandom(MI_NPIXELS(mi))));
- else if (halfrandom(2))
- XSetForeground(display, gc, MI_WIN_WHITE_PIXEL(mi));
- else
- XSetForeground(display, gc, MI_WIN_BLACK_PIXEL(mi));
- XFillRectangle(display, MI_WINDOW(mi), gc,
- halfrandom(s->width - ww),
- halfrandom(s->height - ww),
- ww, ww);
- }
- s->first_time = 0;
-}
-
-static int
-quantize(double d)
-{
- int i = (int) floor(d);
- double f = d - i;
-
- if ((LRAND() & 0xff) < f * 0xff)
- i++;
- return i;
-}
-
-void
-init_slip(ModeInfo * mi)
-{
- slipstruct *sp;
-
- if (slips == NULL) {
- if ((slips = (slipstruct *) calloc(MI_NUM_SCREENS(mi),
- sizeof (slipstruct))) == NULL)
- return;
- }
- sp = &slips[MI_SCREEN(mi)];
-
- sp->width = MI_WIN_WIDTH(mi);
- sp->height = MI_WIN_HEIGHT(mi);
-
- sp->blit_width = sp->width / 25;
- sp->blit_height = sp->height / 25;
- sp->nblits_remaining = 0;
- sp->mode = 0;
- sp->first_time = 1;
-
- /* no "NoExpose" events from XCopyArea wanted */
- XSetGraphicsExposures(MI_DISPLAY(mi), MI_GC(mi), False);
-}
-
-void
-draw_slip(ModeInfo * mi)
-{
- Display *display = MI_DISPLAY(mi);
- Window window = MI_WINDOW(mi);
- GC gc = MI_GC(mi);
- slipstruct *s = &slips[MI_SCREEN(mi)];
- int timer;
-
- timer = MI_BATCHCOUNT(mi) * MI_CYCLES(mi);
-
- while (timer--) {
- int xi = halfrandom(s->width - s->blit_width);
- int yi = halfrandom(s->height - s->blit_height);
- double x, y, dx = 0, dy = 0, t, s1, s2;
-
- if (0 == s->nblits_remaining--) {
- static int lut[] =
- {0, 0, 0, 1, 1, 1, 2};
-
- prepare_screen(mi, s);
- s->nblits_remaining = MI_BATCHCOUNT(mi) *
- (2000 + halfrandom(1000) + halfrandom(1000));
- if (s->mode == 2)
- s->mode = halfrandom(2);
- else
- s->mode = lut[halfrandom(7)];
- }
- x = (2 * xi + s->blit_width) / (double) s->width - 1;
- y = (2 * yi + s->blit_height) / (double) s->height - 1;
-
- /* (x,y) is in biunit square */
- switch (s->mode) {
- case 0: /* rotor */
- dx = x;
- dy = y;
-
- if (dy < 0) {
- dy += 0.04;
- if (dy > 0)
- dy = 0.00;
- }
- if (dy > 0) {
- dy -= 0.04;
- if (dy < 0)
- dy = 0.00;
- }
- t = dx * dx + dy * dy + 1e-10;
- s1 = 2 * dx * dx / t - 1;
- s2 = 2 * dx * dy / t;
- dx = s1 * 5;
- dy = s2 * 5;
- if (s->backwards) { /* jwz: go the other way sometimes */
- dx = -dx;
- dy = -dy;
- }
- break;
- case 1: /* shuffle */
- dx = erandom(3);
- dy = erandom(3);
- break;
- case 2: /* explode */
- dx = x * 3;
- dy = y * 3;
- break;
- }
- {
- int qx = xi + quantize(dx), qy = yi + quantize(dy);
- int wrap;
-
- if (qx < 0 || qy < 0 ||
- qx >= s->width - s->blit_width ||
- qy >= s->height - s->blit_height)
- continue;
-
- XCopyArea(display, window, window, gc, xi, yi,
- s->blit_width, s->blit_height,
- qx, qy);
-
- switch (s->mode) {
- case 0:
- /* wrap */
- wrap = s->width - (2 * s->blit_width);
- if (qx > wrap)
- XCopyArea(display, window, window, gc, qx, qy,
- s->blit_width, s->blit_height,
- qx - wrap, qy);
-
- if (qx < 2 * s->blit_width)
- XCopyArea(display, window, window, gc, qx, qy,
- s->blit_width, s->blit_height,
- qx + wrap, qy);
-
- wrap = s->height - (2 * s->blit_height);
- if (qy > wrap)
- XCopyArea(display, window, window, gc, qx, qy,
- s->blit_width, s->blit_height,
- qx, qy - wrap);
-
- if (qy < 2 * s->blit_height)
- XCopyArea(display, window, window, gc, qx, qy,
- s->blit_width, s->blit_height,
- qx, qy + wrap);
- break;
- case 1:
- case 2:
- break;
- }
- }
- }
-}
-
-void
-release_slip(ModeInfo * mi)
-{
- if (slips != NULL) {
- (void) free((void *) slips);
- slips = NULL;
- }
-}
projects / xscreensaver / blobdiff