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
|
/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("-w width -h height")
static size_t width = 0;
static size_t height = 0;
static int with_multiplier;
#define PROCESS(TYPE, SUFFIX)\
static void\
process_##SUFFIX(struct stream *stream)\
{\
typedef TYPE pixel_t[4];\
pixel_t buf[BUFSIZ / sizeof(pixel_t)];\
TYPE *params, x1, y1, x2, y2, norm, rd = 1; \
TYPE x, y, p, r, rx, ry;\
size_t ix, iy, ptr = 0;\
for (;;) {\
while (stream->ptr < stream->frame_size) {\
if (!eread_stream(stream, stream->frame_size - stream->ptr)) {\
ewriteall(STDOUT_FILENO, buf, ptr * sizeof(*buf), "<stdout>");\
return;\
}\
}\
params = (TYPE *)stream->buf;\
x1 = (params)[0];\
y1 = (params)[1];\
x2 = (params)[4];\
y2 = (params)[5];\
if (with_multiplier)\
rd = (params)[9];\
memmove(stream->buf, stream->buf + stream->frame_size,\
stream->ptr -= stream->frame_size);\
\
x2 -= x1;\
y2 -= y1;\
norm = sqrt(x2 * x2 + y2 * y2);\
x2 /= norm;\
y2 /= norm;\
\
for (iy = 0; iy < height; iy++) {\
y = (TYPE)iy - y1;\
for (ix = 0; ix < width; ix++) {\
x = (TYPE)ix - x1;\
p = x * x2 + y * y2;\
rx = x - p * x2;\
ry = y - p * y2;\
r = sqrt(rx * rx + ry * ry) / rd;\
p = abs(p);\
x = MAX(p, r) / norm;\
buf[ptr][0] = buf[ptr][1] = buf[ptr][2] = buf[ptr][3] = x;\
if (++ptr == ELEMENTSOF(buf)) {\
ewriteall(STDOUT_FILENO, buf, sizeof(buf), "<stdout>");\
ptr = 0;\
}\
}\
}\
}\
}
PROCESS(double, lf)
PROCESS(float, f)
int
main(int argc, char *argv[])
{
struct stream stream;
void (*process)(struct stream *stream);
ARGBEGIN {
case 'w':
width = etozu_flag('w', UARGF(), 1, SIZE_MAX);
break;
case 'h':
height = etozu_flag('h', UARGF(), 1, SIZE_MAX);
break;
default:
usage();
} ARGEND;
if (!width || !height || argc)
usage();
eopen_stream(&stream, NULL);
if (!strcmp(stream.pixfmt, "xyza"))
process = process_lf;
else if (!strcmp(stream.pixfmt, "xyza f"))
process = process_f;
else
eprintf("pixel format %s is not supported, try xyza\n", stream.pixfmt);
if (stream.width > 3 || stream.height > 3 ||
stream.width * stream.height < 2 ||
stream.width * stream.height > 3)
eprintf("<stdin>: each frame must contain exactly 2 or 3 pixels\n");
with_multiplier = stream.width * stream.height == 3;
stream.width = width;
stream.height = height;
fprint_stream_head(stdout, &stream);
efflush(stdout, "<stdout>");
process(&stream);
return 0;
}
|
