#include <u.h>#include <libc.h>#include <draw.h>#include <thread.h> #include "map.h"#include "bt.h" #include "dat.h" Tileset*opentile(char *name, int width, int height){	Tileset *t;	int fd; 	if(name == nil || width < 1 || height < 1){		werrstr("bad tileset: %s %d %d", name, width, height);		return nil;	} 	t = mallocz(sizeof(Tileset), 1);	if(t == nil)		return nil; 	t->width = width;	t->height = height;	t->sz = Pt(width, height); 	if(strrchr(name, '/') != nil)		t->name = strdup(strrchr(name, '/')+1);	else		t->name = strdup(name); 	fd = open(name, OREAD);	if(fd < 0)		goto err; 	t->image = readimage(display, fd, 0);	if(t->image == nil)		goto err; 	close(fd);	return t; err:	free(t->name);	if(fd != -1)		close(fd);	free(t);	return nil;} voidfreetile(Tileset *t){	free(t->name);	freeimage(t->image);	free(t);} voiddrawtile(Tileset *t, Image *dst, Point p, int i){	Rectangle dstr;	Point spt;	int wid; 	wid = Dx(t->image->r) / t->width; 	dstr.min = p;	dstr.max = addpt(p, t->sz); 	spt.x = (i % wid) * t->width;	spt.y = (i / wid) * t->height; 	draw(dst, dstr, t->image, nil, spt);}