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	blind-matrix-orthoproject.c - blind - suckless command-line video editing utili…
	git clone git://git.suckless.org/blind
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	blind-matrix-orthoproject.c (2016B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #ifndef TYPE
	3 #include "common.h"
	4
	5 USAGE("[-c]")
	6
	7 static int per_channel = 0;
	8
	9 #define FILE "blind-matrix-orthoproject.c"
	10 #include "define-functions.h"
	11
	12 int
	13 main(int argc, char *argv[])
	14 {
	15 struct stream stream;
	16 void (process)(struct stream stream);
	17
	18 ARGBEGIN {
	19 case 'c':
	20 per_channel = 1;
	21 break;
	22 default:
	23 usage();
	24 } ARGEND;
	25
	26 if (argc)
	27 usage();
	28
	29 eopen_stream(&stream, NULL);
	30
	31 SELECT_PROCESS_FUNCTION(&stream);
	32 CHECK_CHANS(&stream, == 3, == 1);
	33
	34 if (stream.width > 2 \|\| stream.height > 2 \|\| stream.width * stre…
	35 eprintf("<stdin>: each frame must contain exactly 2 pixe…
	36
	37 stream.width = 3;
	38 stream.height = 3;
	39 fprint_stream_head(stdout, &stream);
	40 efflush(stdout, "<stdout>");
	41
	42 process(&stream);
	43 return 0;
	44 }
	45
	46 #else
	47
	48 static void
	49 PROCESS(struct stream *stream)
	50 {
	51 typedef TYPE pixel_t[4];
	52 pixel_t matrix[9];
	53 pixel_t buf[2];
	54 TYPE x2, y2, norm2;
	55 size_t i;
	56
	57 for (i = 0; i < stream->n_chan; i++) {
	58 matrix[0][i] = 1, matrix[1][i] = 0, matrix[2][i] = 0;
	59 matrix[3][i] = 0, matrix[4][i] = 1, matrix[5][i] = 0;
	60 matrix[6][i] = 0, matrix[7][i] = 0, matrix[8][i] = 1;
	61 }
	62
	63 while (eread_frame(stream, buf)) {
	64 if (per_channel) {
	65 for (i = 0; i < stream->n_chan; i++) {
	66 x2 = buf[0][i] * buf[0][i];
	67 y2 = buf[1][i] * buf[1][i];
	68 norm2 = x2 + y2;
	69 matrix[0][i] = x2 / norm2;
	70 matrix[4][i] = y2 / norm2;
	71 matrix[3][i] = matrix[1][i] = buf[0][i] …
	72 }
	73 } else {
	74 buf[0][1] *= buf[0][3];
	75 buf[1][1] *= buf[1][3];
	76 x2 = buf[0][1] * buf[0][1];
	77 y2 = buf[1][1] * buf[1][1];
	78 norm2 = x2 + y2;
	79 matrix[0][0] = x2 / norm2;
	80 matrix[4][0] = y2 / norm2;
	81 matrix[3][0] = matrix[1][0] = buf[0][1] * buf[1]…
	82 for (i = 1; i < stream->n_chan; i++) {
	83 matrix[0][i] = matrix[0][0];
	84 matrix[1][i] = matrix[1][0];
	85 matrix[3][i] = matrix[3][0];
	86 matrix[4][i] = matrix[4][0];
	87 }
	88 }
	89 ewriteall(STDOUT_FILENO, matrix, sizeof(matrix), "<stdou…
	90 }
	91 }
	92
	93 #endif