1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
#ifndef _plan9_
#include <config.h>
#ifndef NO_MALLOC_H
#include <malloc.h>
#endif
#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif
#include <stdlib.h>
#else
#include <u.h>
#include <libc.h>
#include <stdio.h>
#endif
#include <xthread.h>
#include <filter.h>
#define PIXELWIDTH (f->image->pixelwidth) /*all distances in cm */
#define PIXELHEIGHT (f->image->pixelheight)
#define USER_DIST (60.0)
#define INDEX_DIST (0.3)
#define EYE_DIST (8.5)
#define START1 (60.0)
#define FNC(x) x
#define NCOLORS 256
#define IMAGETYPE SMALLITER
#define spixel_t pixel8_t
static int *table;
struct stereogramdata {
int minc;
struct palette *palette;
struct palette *savedpalette;
};
#include <c256.h>
#define do_stereogram do_stereogram8
#include "stereod.c"
#include <hicolor.h>
#define do_stereogram do_stereogram16
#include "stereod.c"
#include <true24.h>
#define do_stereogram do_stereogram24
#include "stereod.c"
#include <truecolor.h>
#define do_stereogram do_stereogram32
#include "stereod.c"
static int requirement(struct filter *f, struct requirements *r)
{
f->req = *r;
r->nimages = 1;
r->flags &= ~IMAGEDATA;
r->supportedmask =
C256 | TRUECOLOR | TRUECOLOR24 | TRUECOLOR16 | GRAYSCALE;
return (f->next->action->requirement(f->next, r));
}
static int initialize(struct filter *f, struct initdata *i)
{
struct stereogramdata *s = (struct stereogramdata *) f->data;
inhermisc(f, i);
if (s->savedpalette == NULL)
s->savedpalette = clonepalette(i->image->palette);
mkstereogrampalette(i->image->palette);
if (!inherimage
(f, i, TOUCHIMAGE, i->image->width / 2, (i->image->height) / 2,
s->palette, i->image->pixelwidth * 2, i->image->pixelheight * 2))
return 0;
setfractalpalette(f, s->savedpalette);
return (f->previous->action->initialize(f->previous, i));
}
static struct filter *getinstance(CONST struct filteraction *a)
{
struct filter *f = createfilter(a);
struct stereogramdata *i =
(struct stereogramdata *) calloc(1, sizeof(*i));
i->minc = 0;
i->savedpalette = NULL;
i->palette =
createpalette(0, 65536, IMAGETYPE, 0, 65536, NULL, NULL, NULL,
NULL, NULL);
f->data = i;
f->name = "Random dot stereogram";
return (f);
}
static void destroyinstance(struct filter *f)
{
struct stereogramdata *i = (struct stereogramdata *) f->data;
if (i->savedpalette != NULL)
destroypalette(i->savedpalette);
destroypalette(i->palette);
destroyinheredimage(f);
free(f);
free(i);
}
static int doit(struct filter *f, int flags, int time)
{
int val;
struct stereogramdata *s = (struct stereogramdata *) f->data;
int i, y;
double start, maxdist, dist;
updateinheredimage(f);
if (f->fractalc->maxiter < NCOLORS)
s->palette->size = f->fractalc->maxiter;
else
s->palette->size = NCOLORS;
val = f->previous->action->doit(f->previous, flags, time);
#ifdef HAVE_ALLOCA
table = (int *) alloca(sizeof(int) * NCOLORS);
#else
table = (int *) malloc(sizeof(int) * NCOLORS);
#endif
dist = (f->fractalc->s.rr) / 2;
maxdist = INDEX_DIST * FNC(f->fractalc->maxiter) + START1;
do {
start = dist * maxdist - INDEX_DIST * FNC(s->minc);
maxdist *= 5;
}
while (start + INDEX_DIST * (FNC(s->minc)) < 25.0);
if (f->fractalc->maxiter < NCOLORS)
y = f->fractalc->maxiter;
else
y = NCOLORS;
if (y < 256)
y = 256;
for (i = 0; i < y; i++) {
double dist;
if (i != 0)
dist = i;
else
dist = y - 1;
dist = INDEX_DIST * (FNC(dist)) + start;
table[i] =
(int) (EYE_DIST * dist / (dist + USER_DIST) / PIXELWIDTH);
}
drivercall(*f->image,
xth_function(do_stereogram8, f, f->childimage->height),
xth_function(do_stereogram16, f, f->childimage->height),
xth_function(do_stereogram24, f, f->childimage->height),
xth_function(do_stereogram32, f, f->childimage->height));
xth_sync();
#ifndef HAVE_ALLOCA
free(table);
#endif
return val;
}
static void convertup(struct filter *f, int *x, int *y)
{
*y *= 2;
*x *= 2;
f->next->action->convertup(f->next, x, y);
}
static void convertdown(struct filter *f, int *x, int *y)
{
*y /= 2;
*x /= 2;
if (f->previous != NULL)
f->previous->action->convertdown(f->previous, x, y);
}
static void myremovefilter(struct filter *f)
{
struct stereogramdata *s = (struct stereogramdata *) f->data;
if (s->savedpalette != NULL) {
restorepalette(f->image->palette, s->savedpalette);
destroypalette(s->savedpalette);
s->savedpalette = NULL;
}
}
CONST struct filteraction stereogram_filter = {
"Random dot stereogram",
"stereogram",
0,
getinstance,
destroyinstance,
doit,
requirement,
initialize,
convertup,
convertdown,
myremovefilter
};
|
