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	blind-matrix-scale.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	---
	blind-matrix-scale.c (1558B)
	---
	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-scale.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 size_t i;
	55
	56 for (i = 0; i < stream->n_chan; i++) {
	57 matrix[0][i] = 1, matrix[1][i] = 0, matrix[2][i] = 0;
	58 matrix[3][i] = 0, matrix[4][i] = 1, matrix[5][i] = 0;
	59 matrix[6][i] = 0, matrix[7][i] = 0, matrix[8][i] = 1;
	60 }
	61
	62 while (eread_frame(stream, buf)) {
	63 if (per_channel) {
	64 for (i = 0; i < stream->n_chan; i++) {
	65 matrix[0][i] = buf[0][i];
	66 matrix[4][i] = buf[1][i];
	67 }
	68 } else {
	69 buf[0][1] *= buf[0][3];
	70 buf[1][1] *= buf[1][3];
	71 for (i = 0; i < stream->n_chan; i++) {
	72 matrix[0][i] = buf[0][1];
	73 matrix[4][i] = buf[1][1];
	74 }
	75 }
	76 ewriteall(STDOUT_FILENO, matrix, sizeof(matrix), "<stdou…
	77 }
	78 }
	79
	80 #endif