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/* See LICENSE file for copyright and license details. */
#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 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;\
TYPE x, y, u, v, m = 1;\
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)\
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;\
}\
}\
buf[ptr][0] = buf[ptr][1] = buf[ptr][2] = buf[ptr][3] = v;\
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 'a':
if (symmetric)
usage();
anticlockwise = 1;
break;
case 's':
if (anticlockwise)
usage();
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 || 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;
}
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