#include <u.h>#include <libc.h>#include <draw.h> staticintdoflush(Display *d){	int n; 	n = d->bufp-d->buf;	if(n <= 0)		return 1; 	if(write(d->fd, d->buf, n) != n){		if(0)			fprint(2, "flushimage fail: d=%p: %r\n", d); /**/		d->bufp = d->buf;	/* might as well; chance of continuing */		return -1;	}	d->bufp = d->buf;	return 1;} intflushimage(Display *d, int visible){/*	if(visible == 1 && visibleclicks && mousebuttons && _drawmouse.buttons) {		Rectangle r, r1;		int ret; 		r = mousebuttons->r;		r = rectaddpt(r, _drawmouse.xy);		r = rectaddpt(r, Pt(-Dx(mousebuttons->r)/2, -Dy(mousebuttons->r)-3));		drawop(mousesave, mousesave->r, screen, nil, r.min, S); 		r1 = rectaddpt(Rect(0, 0, 22, 22), r.min);		if(_drawmouse.buttons & 1)			drawop(screen, r1, mousebuttons, nil, ZP, S);		r1 = rectaddpt(r1, Pt(21, 0));		if(_drawmouse.buttons & 2)			drawop(screen, r1, mousebuttons, nil, Pt(21, 0), S);		r1 = rectaddpt(r1, Pt(21, 0));		if(_drawmouse.buttons & 4)			drawop(screen, r1, mousebuttons, nil, Pt(42, 0), S);		ret = flushimage(d, 2);		drawop(screen, r, mousesave, nil, ZP, S);		return ret;	}*/ 	if(visible){		*d->bufp++ = 'v';	/* five bytes always reserved for this */		if(d->_isnewdisplay){			BPLONG(d->bufp, d->screenimage->id);			d->bufp += 4;		}	}	return doflush(d);} uchar*bufimage(Display *d, int n){	uchar *p; 	if(n<0 || d == nil || n>d->bufsize){		werrstr("bad count in bufimage");		return nil;	}	if(d->bufp+n > d->buf+d->bufsize)		if(doflush(d) < 0)			return 0;	p = d->bufp;	d->bufp += n;	return p;}