blind-hexagon-tessellation.c - blind - suckless command-line video editing utility
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blind-hexagon-tessellation.c (3144B)
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1 /* See LICENSE file for copyright and license details. */
2 #include "common.h"
3
4 USAGE("[-F pixel-format] block-diameter")
5
6 #define SET_XYZA(TYPE)\
7 (colours = alloca(4 * stream.pixel_size),\
8 ((TYPE *)colours)[ 0] = (TYPE)0.412457445582367600,\
9 ((TYPE *)colours)[ 1] = (TYPE)0.212673370378408280,\
10 ((TYPE *)colours)[ 2] = (TYPE)0.019333942761673460,\
11 ((TYPE *)colours)[ 3] = (TYPE)1,\
12 ((TYPE *)colours)[ 4] = (TYPE)0.770033310827883400,\
13 ((TYPE *)colours)[ 5] = (TYPE)0.927825100869440000,\
14 ((TYPE *)colours)[ 6] = (TYPE)0.138525897843512050,\
15 ((TYPE *)colours)[ 7] = (TYPE)1,\
16 ((TYPE *)colours)[ 8] = (TYPE)0.357575865245515900,\
17 ((TYPE *)colours)[ 9] = (TYPE)0.715151730491031800,\
18 ((TYPE *)colours)[10] = (TYPE)0.119191955081838600,\
19 ((TYPE *)colours)[11] = (TYPE)1,\
20 ((TYPE *)colours)[12] = (TYPE)D65_XYZ_X,\
21 ((TYPE *)colours)[13] = (TYPE)1.0000,\
22 ((TYPE *)colours)[14] = (TYPE)D65_XYZ_Z,\
23 ((TYPE *)colours)[15] = (TYPE)1)
24
25 static struct stream stream = { .width = 0, .height = 0, .frames = 1 };
26
27 int
28 main(int argc, char *argv[])
29 {
30 size_t diameter;
31 const char *pixfmt = "xyza";
32 char *colours;
33 size_t x, y, y2;
34 int k;
35
36 ARGBEGIN {
37 case 'F':
38 pixfmt = UARGF();
39 break;
40 default:
41 usage();
42 } ARGEND;
43
44 if (argc != 1)
45 usage();
46
47 diameter = etozu_arg("block-diameter", argv[0], 1, SIZE_MAX);
48
49 eset_pixel_format(&stream, pixfmt);
50 CHECK_N_CHAN(&stream, 4, 4);
51 if (stream.encoding == DOUBLE)
52 SET_XYZA(double);
53 else if (stream.encoding == FLOAT)
54 SET_XYZA(float);
55 else
56 eprintf("pixel format %s is not supported, try xyza\n", stream.pixfmt);
57
58 stream.width = (size_t)((double)diameter * sqrt(3.));
59 stream.height = diameter * 3 / 2;
60 fprint_stream_head(stdout, &stream);
61 efflush(stdout, "<stdout>");
62
63 for (y = 0; y < stream.height; y++) {
64 for (x = 0; x < stream.width; x++) {
65 if (y * 4 < diameter) {
66 switch (x * 4 / stream.width) {
67 case 0:
68 k = 2 * (4 * x * diameter < stream.width * diameter - 4 * y * stream.width);
69 break;
70 case 1:
71 k = 3 * (4 * x * diameter - stream.width * diameter > 4 * y * stream.width);
72 break;
73 case 2:
74 k = 1 + 2 * (3 * diameter * stream.width - 4 * x * diameter > 4 * y * stream.width);
75 break;
76 default:
77 k = 1 + (4 * x * diameter - 3 * stream.width * diameter > 4 * y * stream.width);
78 break;
79 }
80 } else if (y * 4 < diameter * 3) {
81 k = (x * 2 >= stream.width);
82 } else if (y < diameter) {
83 y2 = diameter - y;
84 switch (x * 4 / stream.width) {
85 case 0:
86 k = 2 * (4 * x * diameter < stream.width * diameter - 4 * y2 * stream.width);
87 break;
88 case 1:
89 k = 3 * (4 * x * diameter - stream.width * diameter > 4 * y2 * stream.width);
90 break;
91 case 2:
92 k = 1 + 2 * (3 * diameter * stream.width - 4 * x * diameter > 4 * y2 * stream.width);
93 break;
94 default:
95 k = 1 + (4 * x * diameter - 3 * stream.width * diameter > 4 * y2 * stream.width);
96 break;
97 }
98 } else {
99 k = (stream.width <= x * 4 && x * 4 < stream.width * 3) + 2;
100 }
101 ewriteall(STDOUT_FILENO, colours + (size_t)k * stream.pixel_size, stream.pixel_size, "<stdout>");
102 }
103 }
104
105 return 0;
106 }