blind

suckless command-line video editing utility
git clone git://git.suckless.org/blind
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blind-colour-srgb.c (1000B)


      1 /* See LICENSE file for copyright and license details. */
      2 #include "common.h"
      3 
      4 USAGE("[-% format] [-d depth] [-l] red green blue")
      5 
      6 int
      7 main(int argc, char *argv[])
      8 {
      9 	unsigned long long int max;
     10 	double red, green, blue, X, Y, Z;
     11 	int depth = 8, linear = 0;
     12 	const char *fmt = NULL;
     13 
     14 	ARGBEGIN {
     15 	case 'd':
     16 		depth = etoi_flag('d', UARGF(), 1, 64);
     17 		break;
     18 	case 'l':
     19 		linear = 1;
     20 		break;
     21 	case '%':
     22 		fmt = UARGF();
     23 		break;
     24 	default:
     25 		usage();
     26 	} ARGEND;
     27 
     28 	if (argc != 3)
     29 		usage();
     30 
     31 	fmt = select_print_format("%! %! %!\n", DOUBLE, fmt);
     32 
     33 	max   = 1ULL << (depth - 1);
     34 	max  |= max - 1;
     35 	red   = etolf_arg("the red value",   argv[0]) / (double)max;
     36 	green = etolf_arg("the green value", argv[1]) / (double)max;
     37 	blue  = etolf_arg("the blue value",  argv[2]) / (double)max;
     38 	if (!linear) {
     39 		red   = srgb_decode(red);
     40 		green = srgb_decode(green);
     41 		blue  = srgb_decode(blue);
     42 	}
     43 
     44 	srgb_to_ciexyz(red, green, blue, &X, &Y, &Z);
     45 	printf(fmt, X, Y, Z);
     46 	efshut(stdout, "<stdout>");
     47 	return 0;
     48 }