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/* See LICENSE file for copyright and license details. */
#include "arg.h"
#include "stream.h"
#include "util.h"
#include <string.h>
#include <unistd.h>
static void
usage(void)
{
eprintf("usage: %s [-r]\n", argv0);
}
static void
process_xyza(struct stream *stream, size_t n, size_t f, size_t fm)
{
size_t i;
double a;
for (i = 0; i < n; i += stream->pixel_size) {
a = ((double *)(stream->buf + i))[3];
a = a * (double)f / fm;
((double *)(stream->buf + i))[3] = a;
}
}
static void
process_xyza_r(struct stream *stream, size_t n, size_t f, size_t fm)
{
size_t i;
double a;
for (i = 0; i < n; i += stream->pixel_size) {
a = ((double *)(stream->buf + i))[3];
a = a * (double)(fm - f) / fm;
((double *)(stream->buf + i))[3] = a;
}
}
int
main(int argc, char *argv[])
{
struct stream stream;
int reverse = 0;
size_t f, h, w;
size_t n, i, fm;
ssize_t r;
void (*process)(struct stream *stream, size_t n, size_t f, size_t fm) = NULL;
ARGBEGIN {
case 'r':
reverse = 1;
break;
default:
usage();
} ARGEND;
if (argc)
usage();
stream.fd = STDIN_FILENO;
stream.file = "<stdin>";
einit_stream(&stream);
fprint_stream_head(stdout, &stream);
fflush(stdout);
if (ferror(stdout))
eprintf("<stdout>:");
if (!strcmp(stream.pixfmt, "xyza"))
process = reverse ? process_xyza_r : process_xyza;
else
eprintf("pixel format %s is not supported, try xyza\n", stream.pixfmt);
fm = stream.frames - 1;
for (f = 0; f < stream.frames; f++) {
for (h = stream.height; h--;) {
for (w = stream.width * stream.pixel_size; w; w -= n) {
if (!eread_stream(&stream, w))
eprintf("<stdin>: file is truncated\n");
n = stream.ptr - (stream.ptr % stream.pixel_size);
process(&stream, n, f, fm);
for (i = 0; i < n; i += (size_t)r) {
r = write(STDOUT_FILENO, stream.buf + i, n - i);
if (r < 0)
eprintf("write <stdout>:");
}
memmove(stream.buf, stream.buf + n, stream.ptr -= n);
}
}
}
return 0;
}
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