blind-matrix-transpose.c - blind - suckless command-line video editing utility
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blind-matrix-transpose.c (1553B)
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1 /* See LICENSE file for copyright and license details. */
2 #ifndef TYPE
3 #include "common.h"
4
5 USAGE("[-c]")
6
7 static int per_channel = 0;
8
9 #define FILE "blind-matrix-transpose.c"
10 #include "define-functions.h"
11
12 int
13 main(int argc, char *argv[])
14 {
15 struct stream stream;
16 void (*process)(struct stream *stream);
17
18 ARGBEGIN {
19 case 'c':
20 per_channel = 1;
21 break;
22 default:
23 usage();
24 } ARGEND;
25
26 if (argc)
27 usage();
28
29 eopen_stream(&stream, NULL);
30
31 SELECT_PROCESS_FUNCTION(&stream);
32 CHECK_CHANS(&stream, == 3, == 1);
33
34 if (stream.width != 1 || stream.height != 1)
35 eprintf("<stdin>: each frame must contain exactly 1 pixels\n");
36
37 stream.width = 3;
38 stream.height = 3;
39 fprint_stream_head(stdout, &stream);
40 efflush(stdout, "<stdout>");
41
42 process(&stream);
43 return 0;
44 }
45
46 #else
47
48 static void
49 PROCESS(struct stream *stream)
50 {
51 typedef TYPE pixel_t[4];
52 pixel_t matrix[9];
53 pixel_t buf;
54 size_t i;
55
56 for (i = 0; i < stream->n_chan; i++) {
57 matrix[0][i] = 1, matrix[1][i] = 0, matrix[2][i] = 0;
58 matrix[3][i] = 0, matrix[4][i] = 1, matrix[5][i] = 0;
59 matrix[6][i] = 0, matrix[7][i] = 0, matrix[8][i] = 1;
60 }
61
62 while (eread_frame(stream, buf)) {
63 if (per_channel) {
64 for (i = 0; i < stream->n_chan; i++) {
65 matrix[3][i] = matrix[1][i] = buf[i];
66 matrix[4][i] = matrix[0][i] = 1 - buf[i];
67 }
68 } else {
69 buf[1] *= buf[3];
70 for (i = 0; i < stream->n_chan; i++) {
71 matrix[3][i] = matrix[1][i] = buf[1];
72 matrix[4][i] = matrix[0][i] = 1 - matrix[3][i];
73 }
74 }
75 ewriteall(STDOUT_FILENO, matrix, sizeof(matrix), "<stdout>");
76 }
77 }
78
79 #endif