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/* See LICENSE file for copyright and license details. */
#ifndef TYPE
#include "common.h"
USAGE("[-a | -s] -w width -h height")
static int anticlockwise = 0;
static int symmetric = 0;
static size_t width = 0;
static size_t height = 0;
static int with_multiplier = 0;
#define FILE "blind-cone-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 's':
symmetric = 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 || (symmetric && anticlockwise) || argc)
usage();
eopen_stream(&stream, NULL);
SELECT_PROCESS_FUNCTION(&stream);
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;
}
#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;
TYPE x, y, u, v, m = 1;
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_multiplier)
m = (params)[9];
memmove(stream->buf, stream->buf + stream->frame_size,
stream->ptr -= stream->frame_size);
x2 -= x1;
y2 -= y1;
u = atan2(y2, x2);
for (iy = 0; iy < height; iy++) {
y = (TYPE)iy - y1;
for (ix = 0; ix < width; ix++) {
x = (TYPE)ix - x1;
if (!x && !y) {
v = 0.5;
} else {
v = atan2(y, x);
v -= u;
v += 2 * (TYPE)M_PI;
v = mod(v, 2 * (TYPE)M_PI);
v /= 2 * (TYPE)M_PI;
if (anticlockwise)
v = 1 - v;
v *= m;
if (symmetric) {
v = mod(2 * v, (TYPE)2);
if (v > 1)
v = 2 - v;
}
}
for (i = 0; i < stream->n_chan; i++)
buf[ptr][i] = v;
if (++ptr == ELEMENTSOF(buf)) {
ewriteall(STDOUT_FILENO, buf, sizeof(buf), "<stdout>");
ptr = 0;
}
}
}
}
}
#endif
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