Add a flag indicating locally-created fonts to SkCreateTypefaceFromCTFont

src/ports/SkFontHost_mac.cpp

Index: src/ports/SkFontHost_mac.cpp
diff --git a/src/ports/SkFontHost_mac.cpp b/src/ports/SkFontHost_mac.cpp
index 4e573541ca2780b2a9383a9e471a1cb294317e58..c830c388eedf55563a344b58c9797a513b841487 100755
--- a/src/ports/SkFontHost_mac.cpp
+++ b/src/ports/SkFontHost_mac.cpp
@@ -575,7 +575,17 @@ SkTypeface* SkCreateTypefaceFromCTFont(CTFontRef fontRef) {
     if (face) {
         face->ref();
     } else {
-        face = NewFromFontRef(fontRef, NULL, false);
+        bool isLocal = false;
+        AutoCFRelease<CTFontDescriptorRef> fontDescriptor(CTFontCopyFontDescriptor(fontRef));
+        AutoCFRelease<CFTypeRef> priority(
+            CTFontDescriptorCopyAttribute(fontDescriptor, kCTFontPriorityAttribute));
+        if (CFGetTypeID(priority) == CFNumberGetTypeID()) {

[bungeman-skia, 2014/10/29 17:40:55]

According to the documentation, the request for kCTFontPriorityAttribute may be
NULL which means it's not a registered font, which seems like it would also make
it 'local'.

+            CFNumberRef priorityNumber = reinterpret_cast<CFNumberRef>(priority.get()); 

[bungeman-skia, 2014/10/29 17:40:55]

I believe this can be a static_cast .

+            uint32_t priorityValue;
+            if (CFNumberGetValue(priorityNumber, kCFNumberSInt32Type, &priorityValue))
+                isLocal = priorityValue >= kCTFontPriorityProcess;
+        }
+        face = NewFromFontRef(fontRef, NULL, isLocal);
         SkTypefaceCache::Add(face, face->fontStyle());
         // NewFromFontRef doesn't retain the parameter, but the typeface it
         // creates does release it in its destructor, so we balance that with