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	blind-sinc-wave.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	---
	blind-sinc-wave.c (3022B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #ifndef TYPE
	3 #include "common.h"
	4
	5 USAGE("[-e] [theta0-stream]")
	6
	7 static int equal = 0;
	8
	9 #define FILE "blind-sinc-wave.c"
	10 #include "define-functions.h"
	11
	12 int
	13 main(int argc, char *argv[])
	14 {
	15 struct stream stream, theta0;
	16 int have_theta0;
	17 void (process)(struct stream grad, struct stream *theta0);
	18
	19 ARGBEGIN {
	20 case 'e':
	21 equal = 1;
	22 break;
	23 default:
	24 usage();
	25 } ARGEND;
	26
	27 if (argc > 1)
	28 usage();
	29
	30 eopen_stream(&stream, NULL);
	31 if ((have_theta0 = argc == 1)) {
	32 eopen_stream(&theta0, argv[0]);
	33 if (theta0.width != 1 \|\| theta0.height != 1)
	34 eprintf("theta0-stream must be of dimension 1x1\…
	35 }
	36
	37 SELECT_PROCESS_FUNCTION(&stream);
	38 CHECK_CHANS(&stream, == 3, == 1);
	39 CHECK_N_CHAN(&stream, 4, 4);
	40
	41 if (have_theta0 && strcmp(stream.pixfmt, theta0.pixfmt))
	42 eprintf("videos use incompatible pixel formats\n");
	43
	44 echeck_dimensions(&stream, WIDTH \| HEIGHT, NULL);
	45
	46 fprint_stream_head(stdout, &stream);
	47 efflush(stdout, "<stdout>");
	48 process(&stream, have_theta0 ? &theta0 : NULL);
	49 return 0;
	50 }
	51
	52 #else
	53
	54 static void
	55 PROCESS(struct stream grad, struct stream theta0)
	56 {
	57 size_t i, n, m = 0;
	58 TYPE *theta0xyza;
	59 TYPE x, theta0x = 0;
	60 TYPE y, theta0y = 0;
	61 TYPE z, theta0z = 0;
	62 TYPE a, theta0a = 0;
	63 do {
	64 if (!m) {
	65 m = grad->frame_size;
	66 if (theta0) {
	67 while (theta0->ptr < theta0->frame_size)
	68 if (!eread_stream(theta0, theta0…
	69 return;
	70 theta0xyza = (TYPE *)theta0->buf;
	71 theta0x = (theta0xyza)[0];
	72 theta0y = (theta0xyza)[1];
	73 theta0z = (theta0xyza)[2];
	74 theta0a = (theta0xyza)[3];
	75 memmove(theta0->buf, theta0->buf + theta…
	76 theta0->ptr -= theta0->frame_siz…
	77 }
	78 }
	79 n = MIN(grad->ptr, m) / grad->pixel_size;
	80 if (equal) {
	81 for (i = 0; i < n; i++) {
	82 a = ((TYPE )(grad->buf))[4 i + 3];
	83 a = (a ? sin(a + theta0y) / a : sin(a + …
	84 ((TYPE )(grad->buf))[4 i + 0] = a;
	85 ((TYPE )(grad->buf))[4 i + 1] = a;
	86 ((TYPE )(grad->buf))[4 i + 2] = a;
	87 ((TYPE )(grad->buf))[4 i + 3] = a;
	88 }
	89 } else {
	90 for (i = 0; i < n; i++) {
	91 x = ((TYPE )(grad->buf))[4 i + 0];
	92 y = ((TYPE )(grad->buf))[4 i + 1];
	93 z = ((TYPE )(grad->buf))[4 i + 2];
	94 a = ((TYPE )(grad->buf))[4 i + 3];
	95 x = (x ? sin(x + theta0x) / x : sin(x + …
	96 y = (y ? sin(y + theta0y) / y : sin(y + …
	97 z = (z ? sin(z + theta0z) / z : sin(z + …
	98 a = (a ? sin(a + theta0a) / a : sin(a + …
	99 ((TYPE )(grad->buf))[4 i + 0] = x;
	100 ((TYPE )(grad->buf))[4 i + 1] = y;
	101 ((TYPE )(grad->buf))[4 i + 2] = z;
	102 ((TYPE )(grad->buf))[4 i + 3] = a;
	103 }
	104 }
	105 n *= grad->pixel_size;
	106 m -= n;
	107 ewriteall(STDOUT_FILENO, grad->buf, n, "<stdout>");
	108 memmove(grad->buf, grad->buf + n, grad->ptr -= n);
	109 } while (eread_stream(grad, SIZE_MAX));
	110 if (grad->ptr)
	111 eprintf("%s: incomplete frame\n", grad->file);
	112 }
	113
	114 #endif