#include <u.h>#include <libc.h>#include <draw.h>#include <memdraw.h>#include "fns.h" voidinitworkrects(Rectangle *wr, int nwr, Rectangle *fbr){	int i, Δy; 	wr[0] = *fbr;	Δy = Dy(wr[0])/nwr;	wr[0].max.y = wr[0].min.y + Δy;	for(i = 1; i < nwr; i++)		wr[i] = rectaddpt(wr[i-1], Pt(0,Δy));	if(wr[nwr-1].max.y < fbr->max.y)		wr[nwr-1].max.y = fbr->max.y;} void *emalloc(ulong n){	void *v; 	v = malloc(n);	if(v == nil)		sysfatal("realloc: %r");	setmalloctag(v, getcallerpc(&n));	return v;} void *erealloc(void *v, ulong n){	void *nv; 	nv = realloc(v, n);	if(nv == nil)		sysfatal("realloc: %r");	if(v == nil)		setmalloctag(nv, getcallerpc(&v));	else		setrealloctag(nv, getcallerpc(&v));	return nv;} Memimage *eallocmemimage(Rectangle r, ulong chan){	Memimage *i; 	i = allocmemimage(r, chan);	if(i == nil)		sysfatal("allocmemimage: %r");	memfillcolor(i, DTransparent);	setmalloctag(i, getcallerpc(&r));	return i;} Memimage *ereadmemimage(int fd){	Memimage *i; 	i = readmemimage(fd);	if(i == nil)		sysfatal("readmemimage: %r");	return i;} intewritememimage(int fd, Memimage *i){	int rc; 	rc = writememimage(fd, i);	if(rc < 0)		sysfatal("writememimage: %r");	return rc;} Image *eallocimage(Display *d, Rectangle r, ulong chan, int repl, ulong col){	Image *i; 	i = allocimage(d, r, chan, repl, col);	if(i == nil)		sysfatal("allocimage: %r");	setmalloctag(i, getcallerpc(&d));	return i;} Image *memimage2image(Display *d, Memimage *m){	Image *i;	Rectangle lr; 	i = eallocimage(d, m->r, m->chan, 0, DNofill);	lr = m->r;	lr.max.y = lr.min.y + 1;	for(; lr.min.y < m->r.max.y; lr.min.y = lr.max.y++)		if(loadimage(i, lr, byteaddr(m, lr.min), bytesperline(lr, m->depth)) < 0)			sysfatal("loadimage: %r");	return i;}