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 }