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	blind-set-alpha.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	---
	blind-set-alpha.c (1645B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "common.h"
	3
	4 USAGE("[-i] alpha-stream")
	5
	6 #define PROCESS(TYPE, INV)\
	7 do {\
	8 size_t i;\
	9 TYPE luma = (TYPE )(alpha->buf) + alpha->luma_chan;\
	10 TYPE alph = (TYPE )(alpha->buf) + alpha->alpha_chan;\
	11 TYPE out = (TYPE )(colour->buf) + colour->alpha_chan;\
	12 n /= colour->chan_size;\
	13 for (i = 0; i < n; i += colour->n_chan)\
	14 out[i] = (INV luma[i]) alph[i];\
	15 } while (0)
	16
	17 static void process_lf (struct stream colour, struct stream alpha, si…
	18 static void process_lf_i(struct stream colour, struct stream alpha, si…
	19 static void process_f (struct stream colour, struct stream alpha, si…
	20 static void process_f_i (struct stream colour, struct stream alpha, si…
	21
	22 int
	23 main(int argc, char *argv[])
	24 {
	25 int invert = 0;
	26 struct stream colour, alpha;
	27 void (process)(struct stream colour, struct stream *alpha, siz…
	28
	29 ARGBEGIN {
	30 case 'i':
	31 invert = 1;
	32 break;
	33 default:
	34 usage();
	35 } ARGEND;
	36
	37 if (argc != 1)
	38 usage();
	39
	40 eopen_stream(&colour, NULL);
	41 eopen_stream(&alpha, argv[0]);
	42
	43 CHECK_CHANS(&colour, != -1, != -1);
	44 CHECK_ALPHA(&colour);
	45 if (colour.encoding == DOUBLE)
	46 process = invert ? process_lf_i : process_lf;
	47 else if (colour.encoding == FLOAT)
	48 process = invert ? process_f_i : process_f;
	49 else
	50 eprintf("pixel format %s is not supported, try xyza\n", …
	51
	52 fprint_stream_head(stdout, &colour);
	53 efflush(stdout, "<stdout>");
	54 process_two_streams(&colour, &alpha, STDOUT_FILENO, "<stdout>", …
	55 return 0;
	56 }