blind-matrix-translate.c - blind - suckless command-line video editing utility
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       ---
       blind-matrix-translate.c (1562B)
       ---
            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-translate.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 * stream.height != 2)
           35                 eprintf("<stdin>: each frame must contain exactly 2 pixels\n");
           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[2][i] = buf[0][i];
           66                                 matrix[5][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[2][i] = buf[0][1];
           73                                 matrix[5][i] = buf[1][1];
           74                         }
           75                 }
           76                 ewriteall(STDOUT_FILENO, matrix, sizeof(matrix), "<stdout>");
           77         }
           78 }
           79 
           80 #endif