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/* See LICENSE file for copyright and license details. */
#ifndef TYPE
#include "common.h"
USAGE("[-s spirals | t] [-al] -w width -h height")
static int anticlockwise = 0;
static int logarithmic = 0;
static int angle = 0;
static double spirals = 1;
static size_t width = 0;
static size_t height = 0;
static int with_params;
static int with_vector;
#define FILE "blind-spiral-gradient.c"
#include "define-functions.h"
int
main(int argc, char *argv[])
{
struct stream stream;
void (*process)(struct stream *stream);
ARGBEGIN {
case 'a':
anticlockwise = 1;
break;
case 'l':
logarithmic = 1;
break;
case 's':
spirals = etolf_flag('s', UARGF());
if (!spirals)
eprintf("the value of -s must not be 0");
break;
case 't':
angle = 1;
break;
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 || (spirals != 1 && angle))
usage();
eopen_stream(&stream, NULL);
SELECT_PROCESS_FUNCTION(&stream);
CHECK_N_CHAN(&stream, 4, 4);
if (stream.width > 5 || stream.height > 5 ||
stream.width * stream.height < 2 ||
stream.width * stream.height > 5)
eprintf("<stdin>: each frame must contain exactly 2, 3, 4, or 5 pixels\n");
with_params = (stream.width * stream.height) & 1;
with_vector = stream.width * stream.height > 3;
stream.width = width;
stream.height = height;
fprint_stream_head(stdout, &stream);
efflush(stdout, "<stdout>");
process(&stream);
return 0;
}
#else
static void
PROCESS(struct stream *stream)
{
typedef TYPE pixel_t[4];
pixel_t buf[BUFSIZ / sizeof(pixel_t)];
TYPE *params, x1, y1, x2, y2, b, r, u, v;
TYPE x, y, a = 0, e = 1, p = 1, k = 1, ep = 1;
TYPE x3 = 1, y3 = 0, rd = 1, P, R, Rx, Ry, Pe = 2, Re = 2, PRe = 0.5;
size_t i, 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_vector) {
x3 = (params)[8];
y3 = (params)[9];
Pe = (params)[12];
Re = (params)[13];
rd = (params)[14];
PRe = 1 / sqrt(Pe * Re);
b = sqrt(x3 * x3 + y3 * y3);
x3 /= b;
y3 /= b;
}
if (with_params) {
a = (params)[with_vector ? 16 : 8];
e = (params)[with_vector ? 17 : 9];
p = (params)[with_vector ? 18 : 10];
k = (params)[with_vector ? 19 : 11];
ep = 1 / (e * p);
}
memmove(stream->buf, stream->buf + stream->frame_size,
stream->ptr -= stream->frame_size);
x2 -= x1;
y2 -= y1;
u = atan2(y2, x2);
b = sqrt(x2 * x2 + y2 * y2);
b *= (TYPE)spirals;
if (logarithmic)
b = log(b);
b /= pow(2 * (TYPE)M_PI, e);
for (iy = 0; iy < height; iy++) {
y = (TYPE)iy - y1;
for (ix = 0; ix < width; ix++) {
x = (TYPE)ix - x1;
if (!x && !y) {
v = 0;
} else {
v = atan2(y, x);
if (anticlockwise)
v = -v;
v -= u;
v += 4 * (TYPE)M_PI;
v = mod(v, 2 * (TYPE)M_PI);
}
if (!with_vector) {
r = sqrt(x * x + y * y);
} else {
P = x * x3 + y * y3;
Rx = x - P * x3;
Ry = y - P * y3;
R = sqrt(Rx * Rx + Ry * Ry) / rd;
P = pow(abs(P), Pe);
R = pow(abs(R), Re);
r = pow(P + R, PRe);
}
r -= a;
if (!logarithmic) {
r = pow(r / b, ep);
r = (r - v) / (2 * (TYPE)M_PI);
} else if (r) {
r = log(r / k);
r = pow(r / b, ep);
r = (r - v) / (2 * (TYPE)M_PI);
}
if (angle)
r = (TYPE)(int)(r + 1) + v / (2 * (TYPE)M_PI);
else
r = mod(r, 1 / (TYPE)spirals) * (TYPE)spirals + r - mod(r, (TYPE)1);
for (i = 0; i < stream->n_chan; i++)
buf[ptr][i] = r;
if (++ptr == ELEMENTSOF(buf)) {
ewriteall(STDOUT_FILENO, buf, sizeof(buf), "<stdout>");
ptr = 0;
}
}
}
}
}
#endif
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