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/* See LICENSE file for copyright and license details. */
#include "stream.h"
#include "util.h"
#include <fcntl.h>
#include <inttypes.h>
#include <string.h>
#include <unistd.h>
USAGE("[-t] width height left top")
int
main(int argc, char *argv[])
{
struct stream stream;
char *buf, *image, *p;
size_t width = 0, height = 0, left = 0, top = 0;
size_t off, yoff = 0, x, y, irown, orown, ptr, n, m;
ssize_t r;
int tile = 0;
ARGBEGIN {
case 't':
tile = 1;
break;
default:
usage();
} ARGEND;
if (argc != 4)
usage();
width = etozu_arg("the width", argv[0], 1, SIZE_MAX);
height = etozu_arg("the height", argv[1], 1, SIZE_MAX);
left = etozu_arg("the left position", argv[2], 0, SIZE_MAX);
top = etozu_arg("the top position", argv[3], 0, SIZE_MAX);
stream.file = "<stdin>";
stream.fd = STDIN_FILENO;
einit_stream(&stream);
if (left + width > stream.width || top + height > stream.height)
eprintf("crop area extends beyond original image\n");
if (tile) {
fprint_stream_head(stdout, &stream);
} else {
x = stream.width, stream.width = width;
y = stream.height, stream.height = height;
fprint_stream_head(stdout, &stream);
stream.width = x;
stream.height = y;
}
efflush(stdout, "<stdout>");
echeck_frame_size(stream.width, stream.height, stream.pixel_size, 0, stream.file);
n = stream.height * (irown = stream.width * stream.pixel_size);
buf = emalloc(n);
orown = width * stream.pixel_size;
m = tile ? n : height * orown;
image = emalloc(m);
left *= stream.pixel_size;
if (!tile) {
off = top * irown;
} else {
off = (orown - (left % orown)) % orown;
yoff = (height - (top % height)) % height;
}
memcpy(buf, stream.buf, ptr = stream.ptr);
for (;;) {
for (; ptr < n; ptr += (size_t)r) {
r = read(stream.fd, buf + ptr, n - ptr);
if (r < 0) {
eprintf("read %s:", stream.file);
} else if (r == 0) {
if (!ptr)
break;
eprintf("%s: incomplete frame", stream.file);
}
}
if (!ptr)
break;
if (!tile) {
for (y = 0; y < height; y++)
memcpy(image + y * orown, buf + y * irown + off, orown);
} else {
for (ptr = y = 0; y < stream.height; y++) {
p = buf + ((y + yoff) % height) * irown + left;
for (x = 0; x < irown; x++, ptr++)
image[ptr++] = p[(x + off) % orown];
}
}
ewriteall(STDOUT_FILENO, image, m, "<stdout>");
}
return 0;
}
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