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	blind-matrix-rotate.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	blind-matrix-rotate.c (2093B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #ifndef TYPE
	3 #include "common.h"
	4
	5 USAGE("[-cd]")
	6
	7 static int per_channel = 0;
	8 static int in_degrees = 0;
	9
	10 #define FILE "blind-matrix-rotate.c"
	11 #include "define-functions.h"
	12
	13 int
	14 main(int argc, char *argv[])
	15 {
	16 struct stream stream;
	17 void (process)(struct stream stream);
	18
	19 ARGBEGIN {
	20 case 'c':
	21 per_channel = 1;
	22 break;
	23 case 'd':
	24 in_degrees = 1;
	25 break;
	26 default:
	27 usage();
	28 } ARGEND;
	29
	30 if (argc)
	31 usage();
	32
	33 eopen_stream(&stream, NULL);
	34
	35 SELECT_PROCESS_FUNCTION(&stream);
	36 CHECK_CHANS(&stream, == 3, == 1);
	37
	38 if (stream.width != 1 \|\| stream.height != 1)
	39 eprintf("<stdin>: each frame must contain exactly 1 pixe…
	40
	41 stream.width = 3;
	42 stream.height = 3;
	43 fprint_stream_head(stdout, &stream);
	44 efflush(stdout, "<stdout>");
	45
	46 process(&stream);
	47 return 0;
	48 }
	49
	50 #else
	51
	52 static void
	53 PROCESS(struct stream *stream)
	54 {
	55 typedef TYPE pixel_t[4];
	56 pixel_t matrix[9];
	57 pixel_t buf;
	58 size_t i;
	59
	60 for (i = 0; i < stream->n_chan; i++) {
	61 matrix[0][i] = 1, matrix[1][i] = 0, matrix[2][i] = 0;
	62 matrix[3][i] = 0, matrix[4][i] = 1, matrix[5][i] = 0;
	63 matrix[6][i] = 0, matrix[7][i] = 0, matrix[8][i] = 1;
	64 }
	65
	66 while (eread_frame(stream, buf)) {
	67 if (per_channel && in_degrees) {
	68 for (i = 0; i < stream->n_chan; i++) {
	69 matrix[4][i] = matrix[0][i] = degcos(buf…
	70 matrix[3][i] = -(matrix[1][i] = degsin(b…
	71 }
	72 } else if (per_channel) {
	73 for (i = 0; i < stream->n_chan; i++) {
	74 matrix[4][i] = matrix[0][i] = cos(buf[i]…
	75 matrix[3][i] = -(matrix[1][i] = sin(buf[…
	76 }
	77 } else {
	78 buf[1] *= buf[3];
	79 if (in_degrees) {
	80 matrix[4][0] = matrix[0][0] = degcos(buf…
	81 matrix[3][0] = -(matrix[1][0] = degsin(b…
	82 } else {
	83 matrix[4][0] = matrix[0][0] = cos(buf[1]…
	84 matrix[3][0] = -(matrix[1][0] = sin(buf[…
	85 }
	86 for (i = 0; i < stream->n_chan; i++) {
	87 matrix[0][i] = matrix[0][0];
	88 matrix[1][i] = matrix[1][0];
	89 matrix[3][i] = matrix[3][0];
	90 matrix[4][i] = matrix[4][0];
	91 }
	92 }
	93 ewriteall(STDOUT_FILENO, matrix, sizeof(matrix), "<stdou…
	94 }
	95 }
	96
	97 #endif