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/* -*- Mode: C; tab-width: 4 -*- */
/* blot --- Rorschach's ink blot test */
#if !defined( lint ) && !defined( SABER )
static const char sccsid[] = "@(#)blot.c 5.00 2000/11/01 xlockmore";
#endif
/*-
* Copyright (c) 1992 by Jamie Zawinski
*
* 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: Compatible with xscreensaver
* 05-Jan-1995: patch for Dual-Headed machines from Greg Onufer
* <Greg.Onufer@Eng.Sun.COM>
* 07-Dec-1994: now randomly has xsym, ysym, or both.
* 02-Sep-1993: xlock version David Bagley <bagleyd@tux.org>
* 1992: xscreensaver version Jamie Zawinski <jwz@jwz.org>
*/
/*-
* original copyright
* Copyright (c) 1992 by Jamie Zawinski
* 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.
*/
#ifdef STANDALONE
#define MODE_blot
#define PROGCLASS "Blot"
#define HACK_INIT init_blot
#define HACK_DRAW draw_blot
#define blot_opts xlockmore_opts
#define DEFAULTS "*delay: 2000000 \n" \
"*count: 6 \n" \
"*cycles: 30 \n" \
"*ncolors: 200 \n"
#include "xlockmore.h" /* in xscreensaver distribution */
#else /* STANDALONE */
#include "xlock.h" /* in xlockmore distribution */
#endif /* STANDALONE */
#ifdef MODE_blot
ModeSpecOpt blot_opts =
{0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
#ifdef USE_MODULES
const ModStruct blot_description =
{"blot", "init_blot", "draw_blot", "release_blot",
"refresh_blot", "init_blot", (char *) NULL, &blot_opts,
200000, 6, 30, 1, 64, 0.3, "",
"Shows Rorschach's ink blot test", 0, NULL};
#endif
typedef struct {
int width;
int height;
int xmid, ymid;
int offset;
int xsym, ysym;
int size;
int pix;
int count;
XPoint *pointBuffer;
unsigned int pointBufferSize;
} blotstruct;
static blotstruct *blots = (blotstruct *) NULL;
void
init_blot(ModeInfo * mi)
{
Display *display = MI_DISPLAY(mi);
blotstruct *bp;
if (blots == NULL) {
if ((blots = (blotstruct *) calloc(MI_NUM_SCREENS(mi),
sizeof (blotstruct))) == NULL)
return;
}
bp = &blots[MI_SCREEN(mi)];
bp->width = MI_WIDTH(mi);
bp->height = MI_HEIGHT(mi);
bp->xmid = bp->width / 2;
bp->ymid = bp->height / 2;
bp->offset = 4;
bp->ysym = (int) LRAND() & 1;
bp->xsym = (bp->ysym) ? (int) LRAND() & 1 : 1;
if (MI_NPIXELS(mi) > 2)
bp->pix = NRAND(MI_NPIXELS(mi));
if (bp->offset <= 0)
bp->offset = 3;
if (MI_COUNT(mi) < 0)
bp->size = NRAND(-MI_COUNT(mi) + 1);
else
bp->size = MI_COUNT(mi);
/* Fudge the size so it takes up the whole screen */
bp->size *= (bp->width / 32 + 1) * (bp->height / 32 + 1);
if (!bp->pointBuffer || bp->pointBufferSize < bp->size * sizeof (XPoint)) {
if (bp->pointBuffer != NULL)
free(bp->pointBuffer);
bp->pointBufferSize = bp->size * sizeof (XPoint);
if ((bp->pointBuffer = (XPoint *) malloc(bp->pointBufferSize)) ==
NULL) {
return;
}
}
MI_CLEARWINDOW(mi);
XSetForeground(display, MI_GC(mi), MI_WHITE_PIXEL(mi));
bp->count = 0;
}
void
draw_blot(ModeInfo * mi)
{
blotstruct *bp;
XPoint *xp;
int x, y, k;
if (blots == NULL)
return;
bp = &blots[MI_SCREEN(mi)];
xp = bp->pointBuffer;
if (xp == NULL)
init_blot(mi);
MI_IS_DRAWN(mi) = True;
if (MI_NPIXELS(mi) > 2) {
XSetForeground(MI_DISPLAY(mi), MI_GC(mi), MI_PIXEL(mi, bp->pix));
if (++bp->pix >= MI_NPIXELS(mi))
bp->pix = 0;
}
x = bp->xmid;
y = bp->ymid;
k = bp->size;
while (k >= 4) {
x += (NRAND(1 + (bp->offset << 1)) - bp->offset);
y += (NRAND(1 + (bp->offset << 1)) - bp->offset);
k--;
xp->x = x;
xp->y = y;
xp++;
if (bp->xsym) {
k--;
xp->x = bp->width - x;
xp->y = y;
xp++;
}
if (bp->ysym) {
k--;
xp->x = x;
xp->y = bp->height - y;
xp++;
}
if (bp->xsym && bp->ysym) {
k--;
xp->x = bp->width - x;
xp->y = bp->height - y;
xp++;
}
}
XDrawPoints(MI_DISPLAY(mi), MI_WINDOW(mi), MI_GC(mi),
bp->pointBuffer, (bp->size - k), CoordModeOrigin);
if (++bp->count > MI_CYCLES(mi))
init_blot(mi);
}
void
release_blot(ModeInfo * mi)
{
if (blots != NULL) {
int screen;
for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
blotstruct *bp = &blots[screen];
if (bp->pointBuffer != NULL) {
free(bp->pointBuffer);
/* bp->pointBuffer == NULL; */
}
}
free(blots);
blots = (blotstruct *) NULL;
}
}
void
refresh_blot(ModeInfo * mi)
{
MI_CLEARWINDOW(mi);
}
#endif /* MODE_blot */
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