Re: [9fans] radar for plan 9, and two draw funnies.

[erik quanstrom <quanstro@quanstro.net>]

i'm sure this could be smaller, but i've got to run.
the images are here: /n/sources/contrib/quanstro/drawfunny/images/

; 8.out <{jpg -t9 /lib/radar/*.jpg} <{gif -t9 /lib/radar/hw.gif} <{gif -t9 /lib/radar/radar.gif}|page

#include <u.h>
#include <libc.h>
#include <bio.h>
#include <draw.h>
#include <memdraw.h>
#include <memlayer.h>

enum {
	CHAN	= RGBA32,
};

void
usage(void)
{
	fprint(2, "usage: composetst...\n");
	exits("usage");
}

Memimage*
newimage(int fd, ulong chan)
{
	Memimage *t, *im;

	im = readmemimage(fd);
	if(im == nil)
		sysfatal("readmemimage: %r");
	if(chan != 0){
		t = allocmemimage(im->r, chan);
		if(t == nil)
			sysfatal("readmemimage: %r");
		memfillcolor(t, DTransparent);
		memdraw(t, im->r, im, ZP, nil, ZP, SoverD);
		freememimage(im);
		im = t;
	}
	return im;
}

void
main(int argc, char **argv)
{
	int i, fd;
	Memimage *im, *scr;

	ARGBEGIN{
	default:
		usage();
	}ARGEND
	if(argc == 0)
		usage();
	memimageinit();
	fd = open(argv[0], OREAD);
	if(fd == -1)
		sysfatal("open: %r");
	scr = newimage(fd, CHAN);
	for(i = 1; i < argc; i++){
		fd = open(argv[i], OREAD);
		if(fd == -1)
			sysfatal("open: %r");
		im = newimage(fd, 0);
		memdraw(scr, scr->r, im, ZP, nil, ZP, SoverD);
		freememimage(im);
	}
	writememimage(1, scr);
	exits("");
}