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	blind-time-blur.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	---
	blind-time-blur.c (1617B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #ifndef TYPE
	3 #include "common.h"
	4
	5 USAGE("alpha-stream")
	6
	7 static int first = 1;
	8
	9 #define FILE "blind-time-blur.c"
	10 #include "define-functions.h"
	11
	12 int
	13 main(int argc, char *argv[])
	14 {
	15 struct stream colour, alpha;
	16 void (process)(char restrict output, char *restrict cbuf, char…
	17 struct stream colour, struct stream alpha);
	18
	19 ARGBEGIN {
	20 default:
	21 usage();
	22 } ARGEND;
	23
	24 if (argc != 1)
	25 usage();
	26
	27 eopen_stream(&colour, NULL);
	28 eopen_stream(&alpha, argv[0]);
	29
	30 SELECT_PROCESS_FUNCTION(&colour);
	31 CHECK_CHANS(&colour, == 3, == 1);
	32 CHECK_N_CHAN(&colour, 4, 4);
	33
	34 echeck_compat(&colour, &alpha);
	35 fprint_stream_head(stdout, &colour);
	36 efflush(stdout, "<stdout>");
	37 process_each_frame_two_streams(&colour, &alpha, STDOUT_FILENO, "…
	38 return 0;
	39 }
	40
	41 #else
	42
	43 static void
	44 PROCESS(char output, char restrict cbuf, char *restrict abuf,
	45 struct stream colour, struct stream alpha)
	46 {
	47 typedef TYPE pixel_t[4];
	48 pixel_t restrict clr = (pixel_t )cbuf;
	49 pixel_t restrict alf = (pixel_t )abuf;
	50 pixel_t img = (pixel_t )output;
	51 size_t i, n = colour->width * colour->height;
	52 TYPE a1, a2;
	53
	54 if (first) {
	55 memcpy(output, cbuf, colour->frame_size);
	56 first = 0;
	57 return;
	58 }
	59
	60 for (i = 0; i < n; i++, clr++, alf++, img++) {
	61 a1 = (*img)[3];
	62 a2 = (clr)[3] (alf)[1] (*alf)[3];
	63 a1 *= (1 - a2);
	64 (img)[0] = (img)[0] * a1 + (clr)[0] a2;
	65 (img)[1] = (img)[1] * a1 + (clr)[1] a2;
	66 (img)[2] = (img)[2] * a1 + (clr)[2] a2;
	67 (*img)[3] = a1 + a2;
	68 }
	69
	70 (void) colour;
	71 (void) alpha;
	72
	73 }
	74
	75 #endif