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/* -*- Mode: C; tab-width: 4 -*- */
/* slip --- lots of slipping blits */
#if 0
static const char sccsid[] = "@(#)slip.c 5.00 2000/11/01 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.
*
* 01-Nov-2000: Allocation checks
* 10-May-1997: Jamie Zawinski <jwz@jwz.org> compatible with xscreensaver
* 01-Dec-1995: Patched for VMS <joukj@hrem.stm.tudelft.nl>
*/
#ifdef STANDALONE
# define MODE_slip
# define DEFAULTS "*delay: 50000 \n" \
"*count: 35 \n" \
"*cycles: 50 \n" \
"*ncolors: 200 \n" \
"*fpsSolid: true \n" \
"*ignoreRotation: True \n" \
# define free_slip 0
# define release_slip 0
# include "xlockmore.h" /* in xscreensaver distribution */
#else /* STANDALONE */
# include "xlock.h" /* in xlockmore distribution */
#endif /* STANDALONE */
#ifdef MODE_slip
ENTRYPOINT ModeSpecOpt slip_opts =
{0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
#ifdef USE_MODULES
ModStruct slip_description =
{"slip", "init_slip", "draw_slip", (char *) NULL,
"init_slip", "init_slip", (char *) NULL, &slip_opts,
50000, 35, 50, 1, 64, 1.0, "",
"Shows slipping blits", 0, NULL};
#endif
typedef struct {
int width, height;
int nblits_remaining;
int blit_width, blit_height;
int mode;
int first_time;
int backwards;
short lasthalf;
int stage;
unsigned long r;
Bool image_loading_p;
} slipstruct;
static slipstruct *slips = (slipstruct *) NULL;
static short
halfrandom(slipstruct *sp, int mv)
{
unsigned long r;
if (sp->lasthalf) {
r = sp->lasthalf;
sp->lasthalf = 0;
} else {
r = LRAND();
sp->lasthalf = (short) (r >> 16);
}
return r % mv;
}
static int
erandom(slipstruct *sp, int mv)
{
int res;
if (0 == sp->stage) {
sp->r = LRAND();
sp->stage = 7;
}
res = (int) (sp->r & 0xf);
sp->r = sp->r >> 4;
sp->stage--;
if (res & 8)
return res & mv;
else
return -(res & mv);
}
#ifdef STANDALONE
static void
image_loaded_cb (Screen *screen, Window w, Drawable d,
const char *name, XRectangle *geom,
void *closure)
{
ModeInfo *mi = (ModeInfo *) closure;
slipstruct *sp = &slips[MI_SCREEN(mi)];
Display *dpy = DisplayOfScreen (screen);
XCopyArea (dpy, d, w, mi->gc, 0, 0,
sp->width, sp->height, 0, 0);
XFreePixmap (dpy, d);
sp->image_loading_p = False;
}
#endif /* STANDALONE */
static Bool
prepare_screen(ModeInfo * mi, slipstruct * sp)
{
Display *display = MI_DISPLAY(mi);
GC gc = MI_GC(mi);
int i, n, w = sp->width / 20;
int not_solid = halfrandom(sp, 10);
sp->backwards = (int) (LRAND() & 1); /* jwz: go the other way sometimes */
if (sp->first_time) {
XClearWindow (display, MI_WINDOW(mi));
n = 300;
} else if (!sp->image_loading_p && !halfrandom(sp, 10)) {
sp->first_time = 1;
sp->nblits_remaining = 0;
MI_CLEARWINDOW(mi);
return False;
} else {
if (halfrandom(sp, 5))
return True;
if (halfrandom(sp, 5))
n = 100;
else
n = 2000;
}
if (MI_NPIXELS(mi) > 2)
XSetForeground(display, gc, MI_PIXEL(mi, halfrandom(sp, MI_NPIXELS(mi))));
else if (halfrandom(sp, 2))
XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
else
XSetForeground(display, gc, MI_BLACK_PIXEL(mi));
for (i = 0; i < n; i++) {
int ww = ((w / 2) + halfrandom(sp, MAX(w, 1)));
if (not_solid) {
if (MI_NPIXELS(mi) > 2)
XSetForeground(display, gc, MI_PIXEL(mi, halfrandom(sp, MI_NPIXELS(mi))));
else if (halfrandom(sp, 2))
XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
else
XSetForeground(display, gc, MI_BLACK_PIXEL(mi));
}
XFillRectangle(display, MI_WINDOW(mi), gc,
halfrandom(sp, MAX(sp->width - ww, 1)),
halfrandom(sp, MAX(sp->height - ww, 1)),
ww, ww);
}
sp->first_time = 0;
#ifdef STANDALONE /* jwz -- sometimes hack the desktop image! */
if (!sp->image_loading_p &&
(1||halfrandom(sp, 2) == 0)) {
/* Load it into a pixmap so that the "Loading" message and checkerboard
don't show up on the window -- we keep running while the image is
in progress... */
Pixmap p = XCreatePixmap (MI_DISPLAY(mi), MI_WINDOW(mi),
sp->width, sp->height, mi->xgwa.depth);
sp->image_loading_p = True;
load_image_async (ScreenOfDisplay (MI_DISPLAY(mi), 0/*####MI_SCREEN(mi)*/),
MI_WINDOW(mi), p, image_loaded_cb, mi);
}
#endif
return True;
}
static int
quantize(double d)
{
int i = (int) floor(d);
double f = d - i;
if ((LRAND() & 0xff) < f * 0xff)
i++;
return i;
}
ENTRYPOINT void
reshape_slip (ModeInfo * mi, int w, int h)
{
slipstruct *sp = &slips[MI_SCREEN(mi)];
sp->width = w;
sp->height = h;
sp->blit_width = sp->width / 25;
sp->blit_height = sp->height / 25;
sp->mode = 0;
sp->nblits_remaining = 0;
}
ENTRYPOINT void
init_slip (ModeInfo * mi)
{
slipstruct *sp;
MI_INIT (mi, slips);
sp = &slips[MI_SCREEN(mi)];
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);
reshape_slip (mi, MI_WIDTH(mi), MI_HEIGHT(mi));
}
ENTRYPOINT void
draw_slip (ModeInfo * mi)
{
Display *display = MI_DISPLAY(mi);
Window window = MI_WINDOW(mi);
GC gc = MI_GC(mi);
int timer;
slipstruct *sp;
if (slips == NULL)
return;
sp = &slips[MI_SCREEN(mi)];
timer = MI_COUNT(mi) * MI_CYCLES(mi);
while (timer--) {
int xi = halfrandom(sp, MAX(sp->width - sp->blit_width, 1));
int yi = halfrandom(sp, MAX(sp->height - sp->blit_height, 1));
double x, y, dx = 0, dy = 0, t, s1, s2;
if (0 == sp->nblits_remaining--) {
static const int lut[] = {0, 0, 0, 1, 1, 1, 2};
if (!prepare_screen(mi, sp))
break;
MI_IS_DRAWN(mi) = True;
sp->nblits_remaining = MI_COUNT(mi) *
(2000 + halfrandom(sp, 1000) + halfrandom(sp, 1000));
if (sp->mode == 2)
sp->mode = halfrandom(sp, 2);
else
sp->mode = lut[halfrandom(sp, 7)];
}
x = (2 * xi + sp->blit_width) / (double) sp->width - 1;
y = (2 * yi + sp->blit_height) / (double) sp->height - 1;
/* (x,y) is in biunit square */
switch (sp->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 (sp->backwards) { /* jwz: go the other way sometimes */
dx = -dx;
dy = -dy;
}
break;
case 1: /* shuffle */
dx = erandom(sp, 3);
dy = erandom(sp, 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 >= sp->width - sp->blit_width ||
qy >= sp->height - sp->blit_height)
continue;
/*-
Seems to cause problems using Exceed
with PseudoColor
X Error of failed request: BadGC (invalid GC parameter)
with TrueColor
X Error of failed request: BadDrawable (invalid Pixmap or Window parameter)
Major opcode of failed request: 62 (X_CopyArea)
*/
XCopyArea(display, window, window, gc, xi, yi,
sp->blit_width, sp->blit_height,
qx, qy);
switch (sp->mode) {
case 0:
/* wrap */
wrap = sp->width - (2 * sp->blit_width);
if (qx > wrap ) {
XCopyArea(display, window, window, gc, qx, qy,
sp->blit_width, sp->blit_height,
qx - wrap, qy);
}
if (qx < 2 * sp->blit_width) {
XCopyArea(display, window, window, gc, qx, qy,
sp->blit_width, sp->blit_height,
qx + wrap, qy);
}
wrap = sp->height - (2 * sp->blit_height);
if (qy > wrap) {
XCopyArea(display, window, window, gc, qx, qy,
sp->blit_width, sp->blit_height,
qx, qy - wrap);
}
if (qy < 2 * sp->blit_height) {
XCopyArea(display, window, window, gc, qx, qy,
sp->blit_width, sp->blit_height,
qx, qy + wrap);
}
break;
case 1:
case 2:
break;
}
}
}
}
ENTRYPOINT Bool
slip_handle_event (ModeInfo *mi, XEvent *event)
{
slipstruct *sp = &slips[MI_SCREEN(mi)];
if (screenhack_event_helper (MI_DISPLAY(mi), MI_WINDOW(mi), event))
{
sp->first_time = 1;
sp->nblits_remaining = 0;
return True;
}
return False;
}
XSCREENSAVER_MODULE ("Slip", slip)
#endif /* MODE_slip */
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