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Add subfont

--- a/libdraw/meson.build

+++ b/libdraw/meson.build

@@ -12,6 +12,7 @@

     'init.c',

     'loadimage.c',

     'openfont.c',

+    'subfont.c',

     'subfontcache.c',

     'window.c',

 ]

--- /dev/null

+++ b/libdraw/subfont.c

@@ -1,0 +1,32 @@

+#include <stdlib.h>

+#include <string.h>

+#include <assert.h>

+#include "draw.h"

+

+Subfont*

+allocsubfont(char *name, int n, int height, int ascent, Fontchar *info, Image *i)

+{

+	Subfont *f;

+

+	assert(height != 0 /* allocsubfont */);

+

+	f = malloc(sizeof(Subfont));

+	if(f == nil)

+		return nil;

+	f->n = n;

+	f->height = height;

+	f->ascent = ascent;

+	f->info = info;

+	f->bits = i;

+	f->ref = 1;

+	if(name){

+		f->name = strdup(name);

+		if(f->name == nil){

+			free(f);

+			return nil;

+		}

+		installsubfont(name, f);

+	}else

+		f->name = nil;

+	return f;

+}