Create and exposed a SkTypeface::RefDefault to the C API

include/c/sk_typeface.h

@@ -17,6 +17,7 @@ SK_C_PLUS_PLUS_BEGIN_GUARD
 // typeface
 
 SK_C_API sk_typeface_t* sk_typeface_create_default(void);
+SK_C_API sk_typeface_t* sk_typeface_ref_default(void);
 SK_C_API sk_typeface_t* sk_typeface_create_from_name_with_font_style(const char *familyName, sk_fontstyle_t* style);
 SK_C_API void sk_typeface_unref(sk_typeface_t*);
 SK_C_API sk_typeface_t* sk_typeface_create_from_file(const char* path, int index);

include/core/SkTypeface.h

@@ -90,6 +90,8 @@ class SK_API SkTypeface : public SkWeakRefCnt {
     /** Returns the default normal typeface, which is never nullptr. */
     static sk_sp<SkTypeface> MakeDefault();
 
+    static sk_sp<SkTypeface> RefDefault();
+
     /** Creates a new reference to the typeface that most closely matches the
         requested familyName and fontStyle. This method allows extended font
         face specifiers as in the SkFontStyle type. Will never return null.

src/c/sk_typeface.cpp

@@ -23,6 +23,10 @@ sk_typeface_t* sk_typeface_create_default(void) {
     return ToTypeface(SkTypeface::MakeDefault().release());
 }
 
+sk_typeface_t* sk_typeface_ref_default(void) {
+    return ToTypeface(SkTypeface::RefDefault().release());
+}
+
 void sk_typeface_unref(sk_typeface_t* tf) {
     SkSafeUnref(AsTypeface(tf));
 }

src/core/SkTypeface.cpp

@@ -111,6 +111,17 @@ sk_sp<SkTypeface> SkTypeface::MakeDefault() {
     return sk_ref_sp(GetDefaultTypeface());
 }
 
+sk_sp<SkTypeface> SkTypeface::RefDefault() {
+    static SkOnce once;
+    static sk_sp<SkTypeface> singleton;
+
+    once([]{
+        SkTypeface* tf = GetDefaultTypeface();
+        singleton = sk_ref_sp(tf);
+    });
+    return singleton;
+}
+
 uint32_t SkTypeface::UniqueID(const SkTypeface* face) {
     if (nullptr == face) {
         face = GetDefaultTypeface();