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/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("[-g | -h | -H | -i | -l power | -L | -p power | -s power | -v | -z power] stream-1 stream-2 ...")
/* 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 *streams, size_t n_streams, size_t n);
/*
* 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, sn = (TYPE)1 / sn, 0, img += val, img *= sn) \
/* geometric mean */\
X(GEOMETRIC, geometric, sn = (TYPE)1 / sn, 1, img *= val, img = nnpow(img, sn))\
/* harmonic mean */\
X(HARMONIC, harmonic,, 0, img += (TYPE)1 / val, img = sn / img)\
/* Heronian mean */\
X(HERONIAN, heronian,, 0, auxs[j] = val,\
img = (auxs[0] + sqrt(auxs[0] * auxs[1]) + auxs[1]) / (TYPE)3)\
/* identric mean */\
X(IDENTRIC, identric, a = (TYPE)(1. / M_E), 0, auxs[j] = val,\
img = auxs[0] == auxs[1] ? auxs[0] :\
nnpow(nnpow(auxs[0], auxs[0]) / nnpow(auxs[1], auxs[1]), auxs[0] - auxs[1]) * a)\
/* Lehmer mean */\
X(LEHMER, lehmer, (a = (TYPE)power, b = a - (TYPE)1), 0,\
(img += nnpow(val, a), aux += nnpow(val, b)), img /= aux)\
/* logarithmic mean */\
X(LOGARITHMIC, logarithmic,, 0, auxs[j] = val,\
img = auxs[0] == auxs[1] ? auxs[0] : (!auxs[0] || !auxs[1]) ? (TYPE)0 :\
(auxs[1] - auxs[0]) / log(auxs[1] / auxs[0]))\
/* power mean (Hölder mean) (m = 2 for root square mean; m = 3 for cubic mean) */\
X(POWER, power, (a = (TYPE)power, b = (TYPE)(1. / power), sn = (TYPE)1 / sn), 0,\
img += nnpow(val, a), img = nnpow(img, b) * sn)\
/* Stolarsky mean */\
X(STOLARSKY, stolarsky, (a = (TYPE)power, b = (TYPE)(1. / (power - 1.))), 0, auxs[j] = val,\
img = auxs[0] == auxs[1] ? auxs[0] :\
nnpow((nnpow(auxs[0], auxs[0]) - nnpow(auxs[1], auxs[1])) /\
(a * (auxs[0] - auxs[1])), b))\
/* variance */\
X(VARIANCE, variance, sn = (TYPE)1 / sn, 0, (img += val * val, aux += val),\
img = (img - aux * aux * sn) * sn)\
/* Heinz mean */\
X(HEINZ, heinz, (a = (TYPE)power, b = (TYPE)1 - a), 0, auxs[j] = val,\
img = (nnpow(auxs[0], a) * nnpow(auxs[1], b) + nnpow(auxs[0], b) * nnpow(auxs[1], 0)) / (TYPE)2)
#define X(V, ...) V,
enum method { LIST_MEANS() };
#undef X
static double power;
#define aux (*auxs)
#define MAKE_PROCESS(PIXFMT, TYPE,\
_1, NAME, INIT, INITIAL, PROCESS_SUBCELL, FINALISE_SUBCELL)\
static void\
process_##PIXFMT##_##NAME(struct stream *streams, size_t n_streams, size_t n)\
{\
size_t i, j;\
TYPE img, auxs[2], val, a, b, sn = (TYPE)n_streams;\
INIT;\
for (i = 0; i < n; i += sizeof(TYPE)) {\
img = auxs[0] = auxs[1] = INITIAL;\
for (j = 0; j < n_streams; j++) {\
val = *(TYPE *)(streams[j].buf + i);\
PROCESS_SUBCELL;\
}\
FINALISE_SUBCELL;\
*(TYPE *)(streams->buf + i) = img;\
}\
(void) aux, (void) a, (void) b, (void) sn;\
}
#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
#undef aux
#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 *streams;
process_func process;
size_t frames = SIZE_MAX, tmp;
enum method method = ARITHMETIC;
int i, two = 0;
ARGBEGIN {
case 'g':
method = GEOMETRIC;
break;
case 'h':
method = HARMONIC;
break;
case 'H':
method = HERONIAN;
two = 1;
break;
case 'i':
method = IDENTRIC;
two = 1;
break;
case 'l':
method = LEHMER;
power = etolf_flag('l', UARGF());
break;
case 'L':
method = LOGARITHMIC;
two = 1;
break;
case 'p':
method = POWER;
power = etolf_flag('p', UARGF());
break;
case 's':
method = STOLARSKY;
two = 1;
power = etolf_flag('s', UARGF());
break;
case 'v':
method = VARIANCE;
break;
case 'z':
method = HEINZ;
two = 1;
power = etolf_flag('z', UARGF());
break;
default:
usage();
} ARGEND;
if (argc < 2 || (argc > 2 && two))
usage();
streams = alloca((size_t)argc * sizeof(*streams));
for (i = 0; i < argc; i++) {
eopen_stream(streams + i, argv[i]);
if (streams[i].frames && streams[i].frames < frames)
frames = streams[i].frames;
}
if (streams->encoding == DOUBLE)
process = process_functions_lf[method];
else
process = process_functions_f[method];
tmp = streams->frames, streams->frames = frames;
fprint_stream_head(stdout, streams);
efflush(stdout, "<stdout>");
streams->frames = tmp;
process_multiple_streams(streams, (size_t)argc, STDOUT_FILENO, "<stdout>", 1, process);
return 0;
}
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