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
|
/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("[-g | -h | -l power | -p power | -v]")
/* TODO add [-w weight-stream] for [-ghlpv] */
/* Because the syntax for a function returning a function pointer is disgusting. */
typedef void (*process_func)(struct stream *stream);
/*
* X-parameter 1: method enum value
* X-parameter 2: identifier-friendly name
* X-parameter 3: initial assignments
* X-parameter 4: initial value
* X-parameter 5: subcell processing
* X-parameter 6: subcell finalisation
*/
#define LIST_MEANS(TYPE)\
/* [default] arithmetic mean */\
X(ARITHMETIC, arithmetic,, 0, img[j & 3] += *buf, img[j & 3] /= pixels)\
/* geometric mean */\
X(GEOMETRIC, geometric,, 1, img[j & 3] *= *buf, img[j & 3] = nnpow(img[j & 3], 1 / pixels))\
/* harmonic mean */\
X(HARMONIC, harmonic,, 0, img[j & 3] += (TYPE)1 / *buf, img[j & 3] = pixels / img[j & 3])\
/* Lehmer mean */\
X(LEHMER, lehmer, (a = (TYPE)power, b = a - (TYPE)1), 0,\
(img[j & 3] += nnpow(*buf, a), aux[j & 3] += nnpow(*buf, b)), img[j & 3] /= aux[j & 3])\
/* power mean (Hölder mean) (m = 2 for root square mean; m = 3 for cubic mean) */\
X(POWER, power, a = (TYPE)power, 0, img[j & 3] += nnpow(*buf, a),\
img[j & 3] = nnpow(img[j & 3], (TYPE)(1. / power)) / pixels)\
/* variance */\
X(VARIANCE, variance,, 0, (img[j & 3] += *buf * *buf, aux[j & 3] += *buf),\
img[j & 3] = (img[j & 3] - aux[j & 3] * aux[j & 3] / pixels) / pixels)
#define X(V, ...) V,
enum method { LIST_MEANS() };
#undef X
static double power;
#define MAKE_PROCESS(PIXFMT, TYPE,\
_1, NAME, INIT, INITIAL, PROCESS_SUBCELL, FINALISE_SUBCELL)\
static void\
process_##PIXFMT##_##NAME(struct stream *stream)\
{\
TYPE img[4], aux[4], *buf, a, b;\
TYPE pixels = (TYPE)(stream->frame_size / sizeof(img));\
size_t i, n, j = 0, m = stream->frame_size / sizeof(*img);\
int first = 1;\
INIT;\
do {\
n = stream->ptr / stream->pixel_size * stream->n_chan;\
buf = (TYPE *)(stream->buf);\
for (i = 0; i < n; i++, buf++, j++, j %= m) {\
if (!j) {\
if (!first) {\
for (j = 0; j < ELEMENTSOF(img); j++)\
FINALISE_SUBCELL;\
j = 0;\
ewriteall(STDOUT_FILENO, img, sizeof(img), "<stdout>");\
}\
first = 0;\
img[0] = aux[0] = INITIAL;\
img[1] = aux[1] = INITIAL;\
img[2] = aux[2] = INITIAL;\
img[3] = aux[3] = INITIAL;\
}\
PROCESS_SUBCELL;\
}\
n *= sizeof(TYPE);\
memmove(stream->buf, stream->buf + n, stream->ptr -= n);\
} while (eread_stream(stream, SIZE_MAX));\
if (!first) {\
for (j = 0; j < ELEMENTSOF(img); j++)\
FINALISE_SUBCELL;\
ewriteall(STDOUT_FILENO, img, sizeof(img), "<stdout>");\
}\
(void) aux, (void) a, (void) b, (void) pixels;\
}
#define X(...) MAKE_PROCESS(lf, double, __VA_ARGS__)
LIST_MEANS(double)
#undef X
#define X(...) MAKE_PROCESS(f, float, __VA_ARGS__)
LIST_MEANS(float)
#undef X
#undef MAKE_PROCESS
#define X(ID, NAME, ...) [ID] = process_lf_##NAME,
static const process_func process_functions_lf[] = { LIST_MEANS() };
#undef X
#define X(ID, NAME, ...) [ID] = process_f_##NAME,
static const process_func process_functions_f[] = { LIST_MEANS() };
#undef X
int
main(int argc, char *argv[])
{
struct stream stream;
process_func process;
enum method method = ARITHMETIC;
ARGBEGIN {
case 'g':
method = GEOMETRIC;
break;
case 'h':
method = HARMONIC;
break;
case 'l':
method = LEHMER;
power = etolf_flag('l', UARGF());
break;
case 'p':
method = POWER;
power = etolf_flag('p', UARGF());
break;
case 'v':
method = VARIANCE;
break;
default:
usage();
} ARGEND;
if (argc)
usage();
eopen_stream(&stream, NULL);
if (stream.encoding == DOUBLE)
process = process_functions_lf[method];
else
process = process_functions_f[method];
if (DPRINTF_HEAD(STDOUT_FILENO, stream.frames, 1, 1, stream.pixfmt) < 0)
eprintf("dprintf:");
process(&stream);
if (stream.ptr)
eprintf("%s: incomplete frame\n", stream.file);
return 0;
}
|
