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	blind-hexagon-tessellation.c - blind - suckless command-line video editing util…
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	---
	blind-hexagon-tessellation.c (3144B)
	---
	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", …
	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 < stre…
	69 break;
	70 case 1:
	71 k = 3 * (4 * x * diameter - stre…
	72 break;
	73 case 2:
	74 k = 1 + 2 * (3 * diameter * stre…
	75 break;
	76 default:
	77 k = 1 + (4 * x * diameter - 3 * …
	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 < stre…
	87 break;
	88 case 1:
	89 k = 3 * (4 * x * diameter - stre…
	90 break;
	91 case 2:
	92 k = 1 + 2 * (3 * diameter * stre…
	93 break;
	94 default:
	95 k = 1 + (4 * x * diameter - 3 * …
	96 break;
	97 }
	98 } else {
	99 k = (stream.width <= x * 4 && x * 4 < st…
	100 }
	101 ewriteall(STDOUT_FILENO, colours + (size_t)k * s…
	102 }
	103 }
	104
	105 return 0;
	106 }