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	blind-rectangle-tessellation.c - blind - suckless command-line video editing ut…
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	---
	blind-rectangle-tessellation.c (2045B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "common.h"
	3
	4 USAGE("[-F pixel-format] block-width block-height")
	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 width, height;
	31 const char *pixfmt = "xyza";
	32 char *colours;
	33 size_t x1, y1, x2, y2;
	34
	35 ARGBEGIN {
	36 case 'F':
	37 pixfmt = UARGF();
	38 break;
	39 default:
	40 usage();
	41 } ARGEND;
	42
	43 if (argc != 2)
	44 usage();
	45
	46 width = etozu_arg("block-width", argv[0], 1, SIZE_MAX);
	47 height = etozu_arg("block-height", argv[1], 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 = 2 * width;
	59 stream.height = 2 * height;
	60 fprint_stream_head(stdout, &stream);
	61 efflush(stdout, "<stdout>");
	62
	63 for (y1 = 0; y1 < 2; y1++)
	64 for (y2 = 0; y2 < height; y2++)
	65 for (x1 = 0; x1 < 2; x1++)
	66 for (x2 = 0; x2 < width; x2++)
	67 ewriteall(STDOUT_FILENO, colours…
	68 stream.pixel_size, "<s…
	69
	70 return 0;
	71 }