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	blind-matrix-shear.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	---
	blind-matrix-shear.c (1952B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #ifndef TYPE
	3 #include "common.h"
	4
	5 USAGE("[-a [-d]] [-c]")
	6
	7 static int by_angle = 0;
	8 static int per_channel = 0;
	9 static int in_degrees = 0;
	10
	11 #define FILE "blind-matrix-shear.c"
	12 #include "define-functions.h"
	13
	14 int
	15 main(int argc, char *argv[])
	16 {
	17 struct stream stream;
	18 void (process)(struct stream stream);
	19
	20 ARGBEGIN {
	21 case 'a':
	22 by_angle = 1;
	23 break;
	24 case 'c':
	25 per_channel = 1;
	26 break;
	27 case 'd':
	28 in_degrees = 1;
	29 break;
	30 default:
	31 usage();
	32 } ARGEND;
	33
	34 if (argc \|\| (in_degrees && !by_angle))
	35 usage();
	36
	37 eopen_stream(&stream, NULL);
	38
	39 SELECT_PROCESS_FUNCTION(&stream);
	40 CHECK_CHANS(&stream, == 3, == 1);
	41
	42 if (stream.width > 2 \|\| stream.height > 2 \|\| stream.width * stre…
	43 eprintf("<stdin>: each frame must contain exactly 2 pixe…
	44
	45 stream.width = 3;
	46 stream.height = 3;
	47 fprint_stream_head(stdout, &stream);
	48 efflush(stdout, "<stdout>");
	49
	50 process(&stream);
	51 return 0;
	52 }
	53
	54 #else
	55
	56 static void
	57 PROCESS(struct stream *stream)
	58 {
	59 typedef TYPE pixel_t[4];
	60 pixel_t matrix[9];
	61 pixel_t buf[2];
	62 TYPE conv = in_degrees ? (TYPE)(M_PI / 180.) : 1;
	63 size_t i;
	64
	65 for (i = 0; i < stream->n_chan; i++) {
	66 matrix[0][i] = 1, matrix[1][i] = 0, matrix[2][i] = 0;
	67 matrix[3][i] = 0, matrix[4][i] = 1, matrix[5][i] = 0;
	68 matrix[6][i] = 0, matrix[7][i] = 0, matrix[8][i] = 1;
	69 }
	70
	71 while (eread_frame(stream, buf)) {
	72 if (by_angle) {
	73 for (i = !per_channel; i < (per_channel ? stream…
	74 buf[0][i] = tan(buf[0][i] * conv);
	75 buf[1][i] = tan(buf[1][i] * conv);
	76 }
	77 }
	78 if (per_channel) {
	79 for (i = 0; i < stream->n_chan; i++) {
	80 matrix[1][i] = buf[0][i];
	81 matrix[3][i] = buf[1][i];
	82 }
	83 } else {
	84 buf[0][1] *= buf[0][3];
	85 buf[1][1] *= buf[1][3];
	86 for (i = 0; i < stream->n_chan; i++) {
	87 matrix[1][i] = buf[0][1];
	88 matrix[3][i] = buf[1][1];
	89 }
	90 }
	91 ewriteall(STDOUT_FILENO, matrix, sizeof(matrix), "<stdou…
	92 }
	93 }
	94
	95 #endif