342 lines
7.8 KiB
C
342 lines
7.8 KiB
C
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/* -*- Mode: C; tab-width: 4 -*- */
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/* slip --- lots of slipping blits */
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#if !defined( lint ) && !defined( SABER )
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static const char sccsid[] = "@(#)slip.c 5.00 2000/11/01 xlockmore";
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#endif
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/*-
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* Copyright (c) 1992 by Scott Draves <spot@cs.cmu.edu>
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright notice appear in all copies and that
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* both that copyright notice and this permission notice appear in
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* supporting documentation.
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*
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* This file is provided AS IS with no warranties of any kind. The author
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* shall have no liability with respect to the infringement of copyrights,
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* trade secrets or any patents by this file or any part thereof. In no
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* event will the author be liable for any lost revenue or profits or
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* other special, indirect and consequential damages.
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*
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* 01-Nov-2000: Allocation checks
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* 10-May-1997: Jamie Zawinski <jwz@jwz.org> compatible with xscreensaver
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* 01-Dec-1995: Patched for VMS <joukj@hrem.stm.tudelft.nl>
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*/
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#ifdef STANDALONE
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#define MODE_slip
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#define PROGCLASS "Slip"
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#define HACK_INIT init_slip
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#define HACK_DRAW draw_slip
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#define slip_opts xlockmore_opts
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#define DEFAULTS "*delay: 50000 \n" \
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"*count: 35 \n" \
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"*cycles: 50 \n" \
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"*ncolors: 200 \n"
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#include "xlockmore.h" /* in xscreensaver distribution */
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#else /* STANDALONE */
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#include "xlock.h" /* in xlockmore distribution */
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#endif /* STANDALONE */
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#ifdef MODE_slip
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ModeSpecOpt slip_opts =
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{0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
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#ifdef USE_MODULES
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ModStruct slip_description =
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{"slip", "init_slip", "draw_slip", "release_slip",
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"init_slip", "init_slip", (char *) NULL, &slip_opts,
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50000, 35, 50, 1, 64, 1.0, "",
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"Shows slipping blits", 0, NULL};
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#endif
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typedef struct {
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int width, height;
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int nblits_remaining;
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int blit_width, blit_height;
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int mode;
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int first_time;
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int backwards;
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short lasthalf;
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int stage;
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unsigned long r;
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} slipstruct;
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static slipstruct *slips = (slipstruct *) NULL;
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static short
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halfrandom(slipstruct *sp, int mv)
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{
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unsigned long r;
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if (sp->lasthalf) {
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r = sp->lasthalf;
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sp->lasthalf = 0;
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} else {
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r = LRAND();
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sp->lasthalf = (short) (r >> 16);
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}
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return r % mv;
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}
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static int
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erandom(slipstruct *sp, int mv)
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{
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int res;
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if (0 == sp->stage) {
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sp->r = LRAND();
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sp->stage = 7;
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}
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res = (int) (sp->r & 0xf);
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sp->r = sp->r >> 4;
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sp->stage--;
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if (res & 8)
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return res & mv;
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else
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return -(res & mv);
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}
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static void
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prepare_screen(ModeInfo * mi, slipstruct * sp)
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{
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Display *display = MI_DISPLAY(mi);
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GC gc = MI_GC(mi);
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int i, n, w = sp->width / 20;
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int not_solid = halfrandom(sp, 10);
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#ifdef STANDALONE /* jwz -- sometimes hack the desktop image! */
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if (halfrandom(sp, 2) == 0) {
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#if 0
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Pixmap p =
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#endif
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grab_screen_image(DefaultScreenOfDisplay(display),
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MI_WINDOW(mi));
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#if 0
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if (p)
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XFreePixmap(display, p);
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return;
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#endif
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}
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#endif
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sp->backwards = (int) (LRAND() & 1); /* jwz: go the other way sometimes */
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if (sp->first_time || !halfrandom(sp, 10)) {
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MI_CLEARWINDOW(mi);
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n = 300;
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} else {
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if (halfrandom(sp, 5))
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return;
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if (halfrandom(sp, 5))
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n = 100;
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else
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n = 2000;
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}
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if (MI_NPIXELS(mi) > 2)
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XSetForeground(display, gc, MI_PIXEL(mi, halfrandom(sp, MI_NPIXELS(mi))));
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else if (halfrandom(sp, 2))
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XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
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else
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XSetForeground(display, gc, MI_BLACK_PIXEL(mi));
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for (i = 0; i < n; i++) {
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int ww = ((w / 2) + halfrandom(sp, MAX(w, 1)));
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if (not_solid) {
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if (MI_NPIXELS(mi) > 2)
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XSetForeground(display, gc, MI_PIXEL(mi, halfrandom(sp, MI_NPIXELS(mi))));
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else if (halfrandom(sp, 2))
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XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
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else
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XSetForeground(display, gc, MI_BLACK_PIXEL(mi));
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}
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XFillRectangle(display, MI_WINDOW(mi), gc,
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halfrandom(sp, MAX(sp->width - ww, 1)),
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halfrandom(sp, MAX(sp->height - ww, 1)),
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ww, ww);
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}
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sp->first_time = 0;
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}
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static int
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quantize(double d)
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{
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int i = (int) floor(d);
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double f = d - i;
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if ((LRAND() & 0xff) < f * 0xff)
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i++;
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return i;
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}
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void
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init_slip(ModeInfo * mi)
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{
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slipstruct *sp;
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if (slips == NULL) {
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if ((slips = (slipstruct *) calloc(MI_NUM_SCREENS(mi),
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sizeof (slipstruct))) == NULL)
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return;
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}
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sp = &slips[MI_SCREEN(mi)];
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sp->width = MI_WIDTH(mi);
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sp->height = MI_HEIGHT(mi);
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sp->blit_width = sp->width / 25;
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sp->blit_height = sp->height / 25;
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sp->nblits_remaining = 0;
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sp->mode = 0;
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sp->first_time = 1;
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/* no "NoExpose" events from XCopyArea wanted */
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XSetGraphicsExposures(MI_DISPLAY(mi), MI_GC(mi), False);
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}
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void
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draw_slip(ModeInfo * mi)
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{
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Display *display = MI_DISPLAY(mi);
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Window window = MI_WINDOW(mi);
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GC gc = MI_GC(mi);
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int timer;
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slipstruct *sp;
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if (slips == NULL)
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return;
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sp = &slips[MI_SCREEN(mi)];
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timer = MI_COUNT(mi) * MI_CYCLES(mi);
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MI_IS_DRAWN(mi) = True;
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while (timer--) {
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int xi = halfrandom(sp, MAX(sp->width - sp->blit_width, 1));
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int yi = halfrandom(sp, MAX(sp->height - sp->blit_height, 1));
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double x, y, dx = 0, dy = 0, t, s1, s2;
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if (0 == sp->nblits_remaining--) {
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static int lut[] =
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{0, 0, 0, 1, 1, 1, 2};
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prepare_screen(mi, sp);
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sp->nblits_remaining = MI_COUNT(mi) *
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(2000 + halfrandom(sp, 1000) + halfrandom(sp, 1000));
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if (sp->mode == 2)
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sp->mode = halfrandom(sp, 2);
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else
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sp->mode = lut[halfrandom(sp, 7)];
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}
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x = (2 * xi + sp->blit_width) / (double) sp->width - 1;
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y = (2 * yi + sp->blit_height) / (double) sp->height - 1;
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/* (x,y) is in biunit square */
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switch (sp->mode) {
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case 0: /* rotor */
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dx = x;
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dy = y;
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if (dy < 0) {
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dy += 0.04;
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if (dy > 0)
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dy = 0.00;
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}
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if (dy > 0) {
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dy -= 0.04;
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if (dy < 0)
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dy = 0.00;
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}
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t = dx * dx + dy * dy + 1e-10;
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s1 = 2 * dx * dx / t - 1;
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s2 = 2 * dx * dy / t;
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dx = s1 * 5;
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dy = s2 * 5;
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if (sp->backwards) { /* jwz: go the other way sometimes */
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dx = -dx;
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dy = -dy;
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}
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break;
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case 1: /* shuffle */
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dx = erandom(sp, 3);
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dy = erandom(sp, 3);
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break;
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case 2: /* explode */
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dx = x * 3;
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dy = y * 3;
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break;
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}
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{
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int qx = xi + quantize(dx), qy = yi + quantize(dy);
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int wrap;
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if (qx < 0 || qy < 0 ||
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qx >= sp->width - sp->blit_width ||
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qy >= sp->height - sp->blit_height)
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continue;
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/*-
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Seems to cause problems using Exceed
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with PseudoColor
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X Error of failed request: BadGC (invalid GC parameter)
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with TrueColor
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X Error of failed request: BadDrawable (invalid Pixmap or Window parameter)
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Major opcode of failed request: 62 (X_CopyArea)
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*/
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XCopyArea(display, window, window, gc, xi, yi,
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sp->blit_width, sp->blit_height,
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qx, qy);
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switch (sp->mode) {
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case 0:
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/* wrap */
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wrap = sp->width - (2 * sp->blit_width);
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if (qx > wrap ) {
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XCopyArea(display, window, window, gc, qx, qy,
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sp->blit_width, sp->blit_height,
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qx - wrap, qy);
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}
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if (qx < 2 * sp->blit_width) {
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XCopyArea(display, window, window, gc, qx, qy,
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sp->blit_width, sp->blit_height,
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qx + wrap, qy);
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}
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wrap = sp->height - (2 * sp->blit_height);
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if (qy > wrap) {
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XCopyArea(display, window, window, gc, qx, qy,
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sp->blit_width, sp->blit_height,
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qx, qy - wrap);
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}
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if (qy < 2 * sp->blit_height) {
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XCopyArea(display, window, window, gc, qx, qy,
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sp->blit_width, sp->blit_height,
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qx, qy + wrap);
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}
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break;
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case 1:
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case 2:
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break;
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}
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}
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}
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}
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void
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release_slip(ModeInfo * mi)
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{
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if (slips != NULL) {
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free(slips);
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slips = (slipstruct *) NULL;
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}
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}
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#endif /* MODE_slip */
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