move most of SkFontHost to private (preceeding making it all private)

In this change, have to accomodate PDF wanting to call openStream and advancedMetrics
Review URL: https://codereview.chromium.org/12739006

git-svn-id: http://skia.googlecode.com/svn/trunk@8156 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 38 insertions, 0 deletions

diff --git a/src/core/SkTypefacePriv.h b/src/core/SkTypefacePriv.h
new file mode 100644
index 0000000000..2f48372b0e
--- /dev/null
+++ b/src/core/SkTypefacePriv.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkTypefacePriv_DEFINED
+#define SkTypefacePriv_DEFINED
+
+#include "SkTypeface.h"
+
+/**
+ *  Return a ref'd typeface, which must later be unref'd
+ *
+ *  If the parameter is non-null, it will be ref'd and returned, otherwise
+ *  it will be the default typeface.
+ */
+static inline SkTypeface* ref_or_default(SkTypeface* face) {
+    return face ? SkRef(face) : SkTypeface::RefDefault();
+}
+
+/**
+ *  Always resolves to a non-null typeface, either the value passed to its
+ *  constructor, or the default typeface if null was passed.
+ */
+class SkAutoResolveDefaultTypeface : public SkAutoTUnref<SkTypeface> {
+public:
+    SkAutoResolveDefaultTypeface() : INHERITED(SkTypeface::RefDefault()) {}
+    
+    SkAutoResolveDefaultTypeface(SkTypeface* face)
+        : INHERITED(ref_or_default(face)) {}
+
+private:
+    typedef SkAutoTUnref<SkTypeface> INHERITED;
+};
+
+#endif