#include "image.h"
#include <bio.h>

void
usage(void)
{
	fprint(2, "usage: %s x y [color]\n", argv0);
	exits("usage");
}

void
main(int argc, char **argv)
{
	Biobuf b;
	int x, y, n, m, o, l;
	ulong c;
	uchar buf[4];

	ARGBEGIN {
	default:
		usage();
	} ARGEND

	c = 0;
	switch(argc) {
	case 3:
		c = atoi(argv[2]);
	case 2:
		x = atoi(argv[0]);
		y = atoi(argv[1]);
		break;

	default:
		usage();
		return;
	}

	if(fmtinstall('H', Hfmt) < 0)
		sysfatal("fmtinstall");
	if(Binit(&b, 1, OWRITE) < 0)
		sysfatal("Binit: %r");

	Bprint(&b, "%H", (ImgHdr){0, RGBA32, Rect(0, 0, x, y)});

	BPLONG(buf, c);
	n = y*x*4;
	for(o = 0; o < n; o += m) {
		l = n-o > sizeof buf ? sizeof buf : n-o;
		if((m = Bwrite(&b, buf, l)) != l)
			sysfatal("write: %r");
	}

	exits(nil);
}