blind-mosaic-corners.c - blind - suckless command-line video editing utility
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blind-mosaic-corners.c (3095B)
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1 /* See LICENSE file for copyright and license details. */
2 #include "common.h"
3
4 USAGE("[-xy]")
5
6 static size_t pixsize;
7
8 static int
9 pixcmp(const void *a, const void *b)
10 {
11 return memcmp(a, b, pixsize);
12 }
13
14 static size_t
15 count_unique(char *base, size_t n)
16 {
17 size_t ret = 1, i;
18 qsort(base, n, pixsize, pixcmp);
19 for (i = 1; i < n; i++)
20 ret += !!memcmp(base + (i - 1) * pixsize, base + i * pixsize, pixsize);
21 return ret;
22 }
23
24 int
25 main(int argc, char *argv[])
26 {
27 int tiled_x = 0;
28 int tiled_y = 0;
29 struct stream stream;
30 void *colours[2];
31 char *buf, *corners, *here, *found;
32 ssize_t dl, dr, du, dd;
33 size_t i, j, n, x, y;
34 int v;
35
36 ARGBEGIN {
37 case 'x':
38 tiled_x = 1;
39 break;
40 case 'y':
41 tiled_y = 1;
42 break;
43 default:
44 usage();
45 } ARGEND;
46
47 if (argc)
48 usage();
49
50 eopen_stream(&stream, NULL);
51 echeck_dimensions(&stream, WIDTH | HEIGHT, NULL);
52
53 n = stream.width * stream.height;
54 buf = emalloc(stream.frame_size);
55 corners = emalloc((n + 7) / 8);
56
57 found = alloca(9 * stream.pixel_size);
58 colours[0] = alloca(stream.pixel_size);
59 colours[1] = alloca(stream.pixel_size);
60 memset(colours[0], 0, stream.pixel_size);
61
62 if (stream.encoding == DOUBLE) {
63 ((double *)(colours[1]))[0] = (double)1;
64 ((double *)(colours[1]))[1] = (double)1;
65 ((double *)(colours[1]))[2] = (double)1;
66 ((double *)(colours[1]))[3] = (double)1;
67 } else if (stream.encoding == FLOAT) {
68 ((float *)(colours[1]))[0] = (float)1;
69 ((float *)(colours[1]))[1] = (float)1;
70 ((float *)(colours[1]))[2] = (float)1;
71 ((float *)(colours[1]))[3] = (float)1;
72 } else {
73 eprintf("pixel format %s is not supported, try xyza\n", stream.pixfmt);
74 }
75
76 fprint_stream_head(stdout, &stream);
77 efflush(stdout, "<stdout>");
78
79 pixsize = stream.pixel_size;
80 while (eread_frame(&stream, buf)) {
81 memset(corners, 0, (n + 7) / 8);
82 for (i = 0; i < n; i++) {
83 here = buf + i * pixsize;
84 x = i % stream.width;
85 y = i / stream.width;
86 j = 1;
87 memcpy(found, here, pixsize);
88
89 dr = (ssize_t)(x != stream.width - 1 ? pixsize : tiled_x ? pixsize - stream.row_size : 0);
90 dl = (ssize_t)(x ? -pixsize : tiled_x ? stream.row_size - pixsize : 0);
91 dd = (ssize_t)(y != stream.height - 1 ? stream.row_size : tiled_y ? stream.row_size - stream.frame_size : 0);
92 du = (ssize_t)(y ? -stream.row_size : tiled_y ? stream.frame_size - stream.row_size : 0);
93
94 memcpy(found + j++ * pixsize, here + dr, pixsize);
95 memcpy(found + j++ * pixsize, here + dl, pixsize);
96 memcpy(found + j++ * pixsize, here + dd, pixsize);
97 memcpy(found + j++ * pixsize, here + du, pixsize);
98 memcpy(found + j++ * pixsize, here + dr + du, pixsize);
99 memcpy(found + j++ * pixsize, here + dl + du, pixsize);
100 memcpy(found + j++ * pixsize, here + dr + dd, pixsize);
101 memcpy(found + j++ * pixsize, here + dl + dd, pixsize);
102
103 if (j > 2 && count_unique(found, j) > 2)
104 corners[i >> 3] |= (char)(1 << (i & 7));
105 }
106 for (i = 0; i < n; i++) {
107 v = (corners[i >> 3] >> (i & 7)) & 1;
108 memcpy(buf + i * pixsize, colours[v], pixsize);
109 }
110 ewriteall(STDOUT_FILENO, buf, stream.frame_size, "<stdout>");
111 }
112
113 free(buf);
114 free(corners);
115 return 0;
116 }