make it possible to access fonts without a display.

src/libdraw/creadimage.c

@@ -54,6 +54,7 @@ creadimage(Display *d, int fd, int dolock)
 		return nil;
 	}
 
+	if(d){
 		if(dolock)
 			lockdisplay(d);
 		i = allocimage(d, r, chan, 0, 0);
@@ -61,7 +62,12 @@ creadimage(Display *d, int fd, int dolock)
 			unlockdisplay(d);
 		if(i == nil)
 			return nil;
-	ncblock = _compblocksize(r, i->depth);
+	}else{
+		i = mallocz(sizeof(Image), 1);
+		if(i == nil)
+			return nil;
+	}
+	ncblock = _compblocksize(r, chantodepth(chan));
 	buf = malloc(ncblock);
 	if(buf == nil)
 		goto Errout;
@@ -90,6 +96,7 @@ creadimage(Display *d, int fd, int dolock)
 		}
 		if(readn(fd, buf, nb)!=nb)
 			goto Errout;
+		if(d){
 			if(dolock)
 				lockdisplay(d);
 			a = bufimage(i->display, 21+nb);
@@ -106,6 +113,7 @@ creadimage(Display *d, int fd, int dolock)
 			memmove(a+21, buf, nb);
 			if(dolock)
 				unlockdisplay(d);
+		}
 		miny = maxy;
 	}
 	free(buf);

src/libdraw/font.c

@@ -161,7 +161,8 @@ cf2subfont(Cachefont *cf, Font *f)
 		if(f->display){
 			if(f->display->screenimage)
 				depth = f->display->screenimage->depth;
-		}
+		}else
+			depth = 8;
 		name = subfontname(cf->name, f->name, depth);
 		if(name == nil)
 			return nil;
@@ -244,7 +245,7 @@ loadchar(Font *f, Rune r, Cacheinfo *c, int h, int noflush, char **subfontname)
 	}
 
 	subf->cf = cf;
-	if(subf->f->ascent > f->ascent){
+	if(subf->f->ascent > f->ascent && f->display){
 		/* should print something? this is a mistake in the font file */
 		/* must prevent c->top from going negative when loading cache */
 		Image *b;
@@ -297,6 +298,8 @@ loadchar(Font *f, Rune r, Cacheinfo *c, int h, int noflush, char **subfontname)
 	c->width = fi->width;
 	c->x = h*f->width;
 	c->left = fi->left;
+	if(f->display == nil)
+		return 1;
 	flushimage(f->display, 0);	/* flush any pending errors */
 	b = bufimage(f->display, 37);
 	if(b == 0)
@@ -355,10 +358,13 @@ fontresize(Font *f, int wid, int ncache, int depth)
 	Display *d;
 
 	ret = 0;
-	d = f->display;
 	if(depth <= 0)
 		depth = 1;
 
+	d = f->display;
+	if(d == nil)
+		goto Nodisplay;
+
 	new = allocimage(d, Rect(0, 0, ncache*wid, f->height), CHAN1(CGrey, depth), 0, 0);
 	if(new == nil){
 		fprint(2, "font cache resize failed: %r\n");
@@ -382,6 +388,7 @@ fontresize(Font *f, int wid, int ncache, int depth)
 	}
 	freeimage(f->cacheimage);
 	f->cacheimage = new;
+    Nodisplay:
 	f->width = wid;
 	f->maxdepth = depth;
 	ret = 1;

src/libdraw/getsubfont.c

@@ -24,10 +24,10 @@ _getsubfont(Display *d, char *name)
 	 * _getsubfont is called only from string.c and stringwidth.c,
 	 * which are known to be safe to have this done.
 	 */
-	if(d->locking == 0)
+	if(d && d->locking == 0)
 		unlockdisplay(d);
-	f = readsubfont(d, name, fd, d->locking==0);
-	if(d->locking == 0)
+	f = readsubfont(d, name, fd, d && d->locking==0);
+	if(d && d->locking == 0)
 		lockdisplay(d);
 	if(f == 0)
 		fprint(2, "getsubfont: can't read %s: %r\n", name);

src/libdraw/readimage.c

@@ -23,7 +23,10 @@ readimage(Display *d, int fd, int dolock)
 		return creadimage(d, fd, dolock);
 	if(readn(fd, hdr+11, 5*12-11) != 5*12-11)
 		return nil;
+	if(d)
 		chunk = d->bufsize - 32;	/* a little room for header */
+	else
+		chunk = 8192;
 
 	/*
 	 * distinguish new channel descriptor from old ldepth.
@@ -69,6 +72,7 @@ readimage(Display *d, int fd, int dolock)
 	maxy = r.max.y;
 
 	l = bytesperline(r, chantodepth(chan));
+	if(d){
 		if(dolock)
 			lockdisplay(d);
 		i = allocimage(d, r, chan, 0, -1);
@@ -76,6 +80,12 @@ readimage(Display *d, int fd, int dolock)
 			unlockdisplay(d);
 		if(i == nil)
 			return nil;
+	}else{
+		i = mallocz(sizeof(Image), 1);
+		if(i == nil)
+			return nil;
+	}
+
 	tmp = malloc(chunk);
 	if(tmp == nil)
 		goto Err;
@@ -105,12 +115,14 @@ readimage(Display *d, int fd, int dolock)
 			for(j=0; j<chunk; j++)
 				tmp[j] ^= 0xFF;
 
+		if(d){
 			if(dolock)
 				lockdisplay(d);
 			if(loadimage(i, Rect(r.min.x, miny, r.max.x, miny+dy), tmp, chunk) <= 0)
 				goto Err1;
 			if(dolock)
 				unlockdisplay(d);
+		}
 		miny += dy;
 	}
 	free(tmp);

src/libdraw/readsubfont.c

@@ -27,10 +27,12 @@ readsubfonti(Display*d, char *name, int fd, Image *ai, int dolock)
 	n = atoi(hdr);
 	p = malloc(6*(n+1));
 	if(p == nil)
-		return nil;
+		goto Err;
 	if(read(fd, p, 6*(n+1)) != 6*(n+1)){
 		werrstr("rdsubfonfile: fontchar read error: %r");
     Err:
+		if(ai == nil)
+			freeimage(i);
 		free(p);
 		return nil;
 	}

src/libdraw/stringwidth.c

@@ -25,7 +25,7 @@ _stringnwidth(Font *f, char *s, Rune *r, int len)
 	}else
 		rptr = &r;
 	twid = 0;
-	while(len && (*s || *r)){
+	while(len>0 && (*s || *r)){
 		max = Max;
 		if(len < max)
 			max = len;

src/libdraw/subfontcache.c

@@ -12,9 +12,10 @@ Subfont	*lastsubfont;
 Subfont*
 lookupsubfont(Display *d, char *name)
 {
-	if(strcmp(name, "*default*") == 0)
+	if(d && strcmp(name, "*default*") == 0)
 		return d->defaultsubfont;
-	if(lastname && strcmp(name, lastname)==0 && d==lastsubfont->bits->display){
+	if(lastname && strcmp(name, lastname)==0)
+	if(d==lastsubfont->bits->display){
 		lastsubfont->ref++;
 		return lastsubfont;
 	}