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/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("[-F pixel-format] block-diameter")
#define SET_XYZA(TYPE)\
(pixwidth *= sizeof(double),\
colours = alloca(4 * pixwidth),\
((TYPE *)colours)[ 0] = (TYPE)(0.0000 * D65_XYZ_X),\
((TYPE *)colours)[ 1] = (TYPE)(0.0000),\
((TYPE *)colours)[ 2] = (TYPE)(0.0000 * D65_XYZ_Z),\
((TYPE *)colours)[ 3] = (TYPE)1,\
((TYPE *)colours)[ 4] = (TYPE)(0.3333 * D65_XYZ_X),\
((TYPE *)colours)[ 5] = (TYPE)(0.3333),\
((TYPE *)colours)[ 6] = (TYPE)(0.3333 * D65_XYZ_Z),\
((TYPE *)colours)[ 7] = (TYPE)1,\
((TYPE *)colours)[ 8] = (TYPE)(0.6667 * D65_XYZ_X),\
((TYPE *)colours)[ 9] = (TYPE)(0.6667),\
((TYPE *)colours)[10] = (TYPE)(0.6667 * D65_XYZ_Z),\
((TYPE *)colours)[11] = (TYPE)1,\
((TYPE *)colours)[12] = (TYPE)(1.0000 * D65_XYZ_X),\
((TYPE *)colours)[13] = (TYPE)(1.0000),\
((TYPE *)colours)[14] = (TYPE)(1.0000 * D65_XYZ_Z),\
((TYPE *)colours)[15] = (TYPE)1)
static struct stream stream = { .width = 0, .height = 0, .frames = 1 };
int
main(int argc, char *argv[])
{
size_t diameter;
const char *pixfmt = "xyza";
size_t pixwidth = 4;
char *colours;
size_t x, y, y2;
int k;
ARGBEGIN {
case 'F':
pixfmt = UARGF();
break;
default:
usage();
} ARGEND;
if (argc != 1)
usage();
diameter = etozu_arg("block-diameter", argv[0], 1, SIZE_MAX);
pixfmt = get_pixel_format(pixfmt, "xyza");
if (!strcmp(pixfmt, "xyza"))
SET_XYZA(double);
else if (!strcmp(pixfmt, "xyza f"))
SET_XYZA(float);
else
eprintf("pixel format %s is not supported, try xyza\n", pixfmt);
strcpy(stream.pixfmt, pixfmt);
stream.width = (size_t)(diameter * sqrt(3.));
stream.height = diameter * 3 / 2;
fprint_stream_head(stdout, &stream);
efflush(stdout, "<stdout>");
for (y = 0; y < stream.height; y++) {
for (x = 0; x < stream.width; x++) {
if (y * 4 < diameter) {
switch (x * 4 / stream.width) {
case 0:
k = 2 * (4 * x * diameter < stream.width * diameter - 4 * y * stream.width);
break;
case 1:
k = 3 * (4 * x * diameter - stream.width * diameter > 4 * y * stream.width);
break;
case 2:
k = 1 + 2 * (3 * diameter * stream.width - 4 * x * diameter > 4 * y * stream.width);
break;
default:
k = 1 + (4 * x * diameter - 3 * stream.width * diameter > 4 * y * stream.width);
break;
}
} else if (y * 4 < diameter * 3) {
k = (x * 2 >= stream.width);
} else if (y < diameter) {
y2 = diameter - y;
switch (x * 4 / stream.width) {
case 0:
k = 2 * (4 * x * diameter < stream.width * diameter - 4 * y2 * stream.width);
break;
case 1:
k = 3 * (4 * x * diameter - stream.width * diameter > 4 * y2 * stream.width);
break;
case 2:
k = 1 + 2 * (3 * diameter * stream.width - 4 * x * diameter > 4 * y2 * stream.width);
break;
default:
k = 1 + (4 * x * diameter - 3 * stream.width * diameter > 4 * y2 * stream.width);
break;
}
} else {
k = (stream.width <= x * 4 && x * 4 < stream.width * 3) + 2;
}
ewriteall(STDOUT_FILENO, colours + k * pixwidth, pixwidth, "<stdout>");
}
}
return 0;
}
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