blind-rectangle-tessellation.c - blind - suckless command-line video editing utility
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       ---
       blind-rectangle-tessellation.c (2045B)
       ---
            1 /* See LICENSE file for copyright and license details. */
            2 #include "common.h"
            3 
            4 USAGE("[-F pixel-format] block-width block-height")
            5 
            6 #define SET_XYZA(TYPE)\
            7         (colours = alloca(4 * stream.pixel_size),\
            8          ((TYPE *)colours)[ 0] = (TYPE)0.412457445582367600,\
            9          ((TYPE *)colours)[ 1] = (TYPE)0.212673370378408280,\
           10          ((TYPE *)colours)[ 2] = (TYPE)0.019333942761673460,\
           11          ((TYPE *)colours)[ 3] = (TYPE)1,\
           12          ((TYPE *)colours)[ 4] = (TYPE)0.770033310827883400,\
           13          ((TYPE *)colours)[ 5] = (TYPE)0.927825100869440000,\
           14          ((TYPE *)colours)[ 6] = (TYPE)0.138525897843512050,\
           15          ((TYPE *)colours)[ 7] = (TYPE)1,\
           16          ((TYPE *)colours)[ 8] = (TYPE)0.357575865245515900,\
           17          ((TYPE *)colours)[ 9] = (TYPE)0.715151730491031800,\
           18          ((TYPE *)colours)[10] = (TYPE)0.119191955081838600,\
           19          ((TYPE *)colours)[11] = (TYPE)1,\
           20          ((TYPE *)colours)[12] = (TYPE)D65_XYZ_X,\
           21          ((TYPE *)colours)[13] = (TYPE)1.0000,\
           22          ((TYPE *)colours)[14] = (TYPE)D65_XYZ_Z,\
           23          ((TYPE *)colours)[15] = (TYPE)1)
           24 
           25 static struct stream stream = { .width = 0, .height = 0, .frames = 1 };
           26 
           27 int
           28 main(int argc, char *argv[])
           29 {
           30         size_t width, height;
           31         const char *pixfmt = "xyza";
           32         char *colours;
           33         size_t x1, y1, x2, y2;
           34 
           35         ARGBEGIN {
           36         case 'F':
           37                 pixfmt = UARGF();
           38                 break;
           39         default:
           40                 usage();
           41         } ARGEND;
           42 
           43         if (argc != 2)
           44                 usage();
           45 
           46         width  = etozu_arg("block-width", argv[0], 1, SIZE_MAX);
           47         height = etozu_arg("block-height", argv[1], 1, SIZE_MAX);
           48 
           49         eset_pixel_format(&stream, pixfmt);
           50         CHECK_N_CHAN(&stream, 4, 4);
           51         if (stream.encoding == DOUBLE)
           52                 SET_XYZA(double);
           53         else if (stream.encoding == FLOAT)
           54                 SET_XYZA(float);
           55         else
           56                 eprintf("pixel format %s is not supported, try xyza\n", stream.pixfmt);
           57 
           58         stream.width  = 2 * width;
           59         stream.height = 2 * height;
           60         fprint_stream_head(stdout, &stream);
           61         efflush(stdout, "<stdout>");
           62 
           63         for (y1 = 0; y1 < 2; y1++)
           64                 for (y2 = 0; y2 < height; y2++)
           65                         for (x1 = 0; x1 < 2; x1++)
           66                                 for (x2 = 0; x2 < width; x2++)
           67                                         ewriteall(STDOUT_FILENO, colours + (y1 * 2 + x1) * stream.pixel_size,
           68                                                   stream.pixel_size, "<stdout>");
           69 
           70         return 0;
           71 }