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	blind-set-saturation.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	blind-set-saturation.c (2474B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "common.h"
	3
	4 USAGE("[-w] saturation-stream")
	5
	6 #define PROCESS(TYPE)\
	7 do {\
	8 size_t i;\
	9 TYPE s, x, y, z;\
	10 for (i = 0; i < n; i += colour->pixel_size) {\
	11 s = ((TYPE *)(satur->buf + i))[1];\
	12 s = ((TYPE )(satur->buf + i))[3];\
	13 x = ((TYPE *)(colour->buf + i)) + 0;\
	14 y = ((TYPE *)(colour->buf + i))[1];\
	15 z = ((TYPE *)(colour->buf + i)) + 2;\
	16 x = ((x / (TYPE)D65_XYZ_X - y) * s + y) * (TYP…
	17 z = ((z / (TYPE)D65_XYZ_Z - y) * s + y) * (TYP…
	18 /*
	19 * Explaination:
	20 * Y is the luma and ((X / Xn - Y / Yn), (Z / …
	21 * is the chroma (according to CIELAB), where …
	22 * is the white point.
	23 */\
	24 }\
	25 } while (0)
	26
	27 #define PROCESS_W(TYPE)\
	28 do {\
	29 size_t i;\
	30 TYPE s, x, y, z, X, Z;\
	31 for (i = 0; i < n; i += colour->pixel_size) {\
	32 X = ((TYPE *)(satur->buf + i))[0];\
	33 Z = ((TYPE *)(satur->buf + i))[2];\
	34 s = ((TYPE *)(satur->buf + i))[1];\
	35 s = ((TYPE )(satur->buf + i))[3];\
	36 x = ((TYPE *)(colour->buf + i)) + 0;\
	37 y = ((TYPE *)(colour->buf + i))[1];\
	38 z = ((TYPE *)(colour->buf + i)) + 2;\
	39 x = ((x / X - y) * s + y) * X;\
	40 z = ((z / Z - y) * s + y) * Z;\
	41 }\
	42 } while (0)
	43
	44 static void process_lf (struct stream colour, struct stream satur, si…
	45 static void process_lf_w(struct stream colour, struct stream satur, si…
	46 static void process_f (struct stream colour, struct stream satur, si…
	47 static void process_f_w (struct stream colour, struct stream satur, si…
	48
	49 int
	50 main(int argc, char *argv[])
	51 {
	52 struct stream colour, satur;
	53 int whitepoint = 0;
	54 void (process)(struct stream colour, struct stream *satur, siz…
	55
	56 ARGBEGIN {
	57 case 'w':
	58 whitepoint = 1;
	59 break;
	60 default:
	61 usage();
	62 } ARGEND;
	63
	64 if (argc != 1)
	65 usage();
	66
	67 eopen_stream(&colour, NULL);
	68 eopen_stream(&satur, argv[0]);
	69
	70 CHECK_COLOUR_SPACE(&colour, CIEXYZ);
	71 CHECK_CHANS(&colour, == 3, == 1);
	72 if (colour.encoding == DOUBLE)
	73 process = whitepoint ? process_lf_w : process_lf;
	74 else if (colour.encoding == FLOAT)
	75 process = whitepoint ? process_f_w : process_f;
	76 else
	77 eprintf("pixel format %s is not supported, try xyza\n", …
	78
	79 fprint_stream_head(stdout, &colour);
	80 efflush(stdout, "<stdout>");
	81 process_two_streams(&colour, &satur, STDOUT_FILENO, "<stdout>", …
	82 return 0;
	83 }