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/* See LICENSE file for copyright and license details. */
#ifndef TYPE
#include "common.h"
USAGE("")
static int equal = 0;
#define FILE "blind-invert-matrix.c"
#include "define-functions.h"
int
main(int argc, char *argv[])
{
struct stream stream;
size_t width, x, y, i, row_size;
char *buf, *one, *p;
void (*process)(struct stream *stream, void *buf);
ARGBEGIN {
case 'e':
equal = 1;
break;
default:
usage();
} ARGEND;
if (argc)
usage();
eopen_stream(&stream, NULL);
echeck_dimensions(&stream, WIDTH | HEIGHT, NULL);
width = stream.width;
if (stream.width < stream.height)
eprintf("<stdin>: the video must be at least as wide as it is tall\n");
else if (stream.width > stream.height)
stream.width -= stream.height;
fprint_stream_head(stdout, &stream);
stream.width = width;
efflush(stdout, "<stdout>");
one = alloca(stream.pixel_size);
if (!strcmp(stream.pixfmt, "xyza")) {
*(double *)one = 1;
process = process_lf;
} else if (!strcmp(stream.pixfmt, "xyza f")) {
*(float *)one = 1;
process = process_f;
} else {
eprintf("pixel format %s is not supported, try xyza\n", stream.pixfmt);
}
for (i = 1; i < stream.n_chan; i++)
memcpy(one + i * stream.chan_size, one, stream.chan_size);
width = stream.width > stream.height ? stream.width : 2 * stream.height;
buf = emalloc2(width, stream.col_size);
row_size = width * stream.pixel_size;
while (eread_frame(&stream, buf)) {
if (stream.width == stream.height) {
for (y = stream.height; y--;) {
memmove(buf + y * row_size, buf + y * stream.row_size, stream.row_size);
memset(buf + y * row_size + stream.row_size, 0, stream.row_size);
memcpy(buf + y * row_size + stream.row_size + y * stream.pixel_size, one, stream.pixel_size);
}
}
if (equal) {
process(&stream, buf);
for (y = 0; y < stream.height; y++) {
for (x = 0; x < stream.width; x++) {
p = buf + y * row_size + x * stream.pixel_size;
for (i = 1; i < stream.n_chan; i++)
memcpy(p + i * stream.chan_size, p, stream.chan_size);
}
}
} else {
for (i = 0; i < stream.n_chan; i++)
process(&stream, buf + i * stream.chan_size);
}
for (y = 0; y < stream.height; y++)
ewriteall(STDOUT_FILENO, buf + y * row_size + stream.col_size, row_size - stream.col_size, "<stdout>");
}
free(buf);
return 0;
}
#else
#define SUB_ROWS()\
do {\
p2 = matrix + r2 * cn;\
t = p2[r1][0];\
for (c = 0; c < cn; c++)\
p2[c][0] -= p1[c][0] * t;\
} while (0)
static void
PROCESS(struct stream *stream, void *buf)
{
typedef TYPE pixel_t[4];
size_t rn = stream->height, r1, r2, c;
size_t cn = stream->width > rn ? stream->width : 2 * rn;
pixel_t *matrix = buf, *p1, *p2;
TYPE t;
for (r1 = 0; r1 < rn; r1++) {
p1 = matrix + r1 * cn;
if (!p1[r1][0]) {
for (r2 = r1 + 1; r2 < rn; r2++) {
p2 = matrix + r2 * cn;
if (p2[r1][0])
break;
}
if (r2 >= rn)
eprintf("matrix is not invertable\n");
for (c = 0; c < cn; c++)
t = p1[c][0], p1[c][0] = p2[c][0], p2[c][0] = t;
}
t = 1 / p1[r1][0];
for (c = 0; c < cn; c++)
p1[c][0] *= t;
for (r2 = r1 + 1; r2 < rn; r2++)
SUB_ROWS();
}
for (r1 = rn; r1--;) {
p1 = matrix + r1 * cn;
for (r2 = r1; r2--;)
SUB_ROWS();
}
}
#undef SUB_ROWS
#endif
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