harvey/sys/src/libdraw/border.c

/*
 * This file is part of the UCB release of Plan 9. It is subject to the license
 * terms in the LICENSE file found in the top-level directory of this
 * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
 * part of the UCB release of Plan 9, including this file, may be copied,
 * modified, propagated, or distributed except according to the terms contained
 * in the LICENSE file.
 */

#include <u.h>
#include <libc.h>
#include <draw.h>

void
border(Image *im, Rectangle r, int i, Image *color, Point sp)
{
	if(i < 0){
		r = insetrect(r, i);
		sp = addpt(sp, Pt(i,i));
		i = -i;
	}
	draw(im, Rect(r.min.x, r.min.y, r.max.x, r.min.y+i),
		color, nil, sp);
	draw(im, Rect(r.min.x, r.max.y-i, r.max.x, r.max.y),
		color, nil, Pt(sp.x, sp.y+Dy(r)-i));
	draw(im, Rect(r.min.x, r.min.y+i, r.min.x+i, r.max.y-i),
		color, nil, Pt(sp.x, sp.y+i));
	draw(im, Rect(r.max.x-i, r.min.y+i, r.max.x, r.max.y-i),
		color, nil, Pt(sp.x+Dx(r)-i, sp.y+i));
}