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	blind-dissolve.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	blind-dissolve.c (1255B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "common.h"
	3
	4 USAGE("[-r]")
	5
	6 static size_t fm;
	7 static double fm_double;
	8 static float fm_float;
	9 static int reverse = 0;
	10
	11 #define PROCESS(TYPE)\
	12 do {\
	13 size_t i = (size_t)(stream->alpha_chan) * stream->chan_s…
	14 TYPE a = fm ? (TYPE)(reverse ? f : fm - f) / fm_##TYPE :…
	15 for (; i < n; i += stream->pixel_size)\
	16 (TYPE )(stream->buf + i) *= a;\
	17 } while (0)
	18
	19 static void process_lf(struct stream *stream, size_t n, size_t f) {PROCE…
	20 static void process_f (struct stream *stream, size_t n, size_t f) {PROCE…
	21
	22 int
	23 main(int argc, char *argv[])
	24 {
	25 struct stream stream;
	26 void (process)(struct stream stream, size_t n, size_t f);
	27
	28 ARGBEGIN {
	29 case 'r':
	30 reverse = 1;
	31 break;
	32 default:
	33 usage();
	34 } ARGEND;
	35
	36 if (argc)
	37 usage();
	38
	39 eopen_stream(&stream, NULL);
	40
	41 SELECT_PROCESS_FUNCTION(&stream);
	42 CHECK_CHANS(&stream, != -1, == stream.luma_chan);
	43
	44 if (!stream.frames)
	45 eprintf("video's length is not recorded");
	46
	47 fprint_stream_head(stdout, &stream);
	48 efflush(stdout, "<stdout>");
	49 fm_double = (double)(fm = stream.frames - 1);
	50 fm_float = (float)fm_double;
	51 process_each_frame_segmented(&stream, STDOUT_FILENO, "<stdout>",…
	52 return 0;
	53 }