GopherProxy

	blind-invert-luma.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
	Log
	Files
	Refs
	README
	LICENSE
	---
	blind-invert-luma.c (3065B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "common.h"
	3
	4 USAGE("[-iw] mask-stream")
	5
	6 #define PROCESS(TYPE, INV)\
	7 do {\
	8 size_t i;\
	9 TYPE w, y, yo;\
	10 for (i = 0; i < n; i += colour->pixel_size) {\
	11 w = INV ((TYPE *)(mask->buf + i))[1];\
	12 w = ((TYPE )(mask->buf + i))[3];\
	13 yo = ((TYPE *)(colour->buf + i))[1];\
	14 y = (1 - yo) * w + yo * (1 - w);\
	15 ((TYPE )(colour->buf + i))[0] += (y - yo) (TY…
	16 ((TYPE *)(colour->buf + i))[1] = y;\
	17 ((TYPE )(colour->buf + i))[2] += (y - yo) (TY…
	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, INV)\
	28 do {\
	29 size_t i;\
	30 TYPE w, y, yo, X, Z;\
	31 for (i = 0; i < n; i += colour->pixel_size) {\
	32 X = ((TYPE *)(mask->buf + i))[0];\
	33 Z = ((TYPE *)(mask->buf + i))[2];\
	34 w = INV ((TYPE *)(mask->buf + i))[1];\
	35 w = ((TYPE )(mask->buf + i))[3];\
	36 yo = ((TYPE *)(colour->buf + i))[1];\
	37 y = (1 - yo) * w + yo * (1 - w);\
	38 ((TYPE )(colour->buf + i))[0] += (y - yo) X;\
	39 ((TYPE *)(colour->buf + i))[1] = y;\
	40 ((TYPE )(colour->buf + i))[2] += (y - yo) Z;\
	41 }\
	42 } while (0)
	43
	44 static void process_lf (struct stream colour, struct stream mask, si…
	45 static void process_lf_i (struct stream colour, struct stream mask, si…
	46 static void process_lf_w (struct stream colour, struct stream mask, si…
	47 static void process_lf_iw(struct stream colour, struct stream mask, si…
	48 static void process_f (struct stream colour, struct stream mask, si…
	49 static void process_f_i (struct stream colour, struct stream mask, si…
	50 static void process_f_w (struct stream colour, struct stream mask, si…
	51 static void process_f_iw (struct stream colour, struct stream mask, si…
	52
	53 int
	54 main(int argc, char *argv[])
	55 {
	56 int invert = 0, whitepoint = 0;
	57 struct stream colour, mask;
	58 void (process)(struct stream colour, struct stream *mask, size…
	59
	60 ARGBEGIN {
	61 case 'i':
	62 invert = 1;
	63 break;
	64 case 'w':
	65 whitepoint = 1;
	66 break;
	67 default:
	68 usage();
	69 } ARGEND;
	70
	71 if (argc != 1)
	72 usage();
	73
	74 eopen_stream(&colour, NULL);
	75 eopen_stream(&mask, argv[0]);
	76
	77 CHECK_ALPHA(&colour);
	78 CHECK_COLOUR_SPACE(&colour, CIEXYZ);
	79 if (colour.encoding == DOUBLE)
	80 process = invert ? whitepoint ? process_lf_iw : process_…
	81 : whitepoint ? process_lf_w : process_…
	82 else if (colour.encoding == FLOAT)
	83 process = invert ? whitepoint ? process_f_iw : process_f…
	84 : whitepoint ? process_f_w : process_f;
	85 else
	86 eprintf("pixel format %s is not supported, try xyza\n", …
	87
	88 fprint_stream_head(stdout, &colour);
	89 efflush(stdout, "<stdout>");
	90 process_two_streams(&colour, &mask, STDOUT_FILENO, "<stdout>", p…
	91 return 0;
	92 }