Extend SkFontMgr_Custom to cover ttc, otf, pfb.

src/ports/SkFontMgr_fontconfig.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDataTable.h"
 #include "SkFontDescriptor.h"
 #include "SkFontHost_FreeType_common.h"
@@ skipping 434 matching lines @@
                     FC_PROPORTIONAL != get_int(pattern, FC_SPACING, FC_PROPORTIONAL))
         , fPattern(pattern)
     { };
 
     typedef SkTypeface_FreeType INHERITED;
 };
 
 class SkFontMgr_fontconfig : public SkFontMgr {
     mutable SkAutoFcConfig fFC;
     SkAutoTUnref<SkDataTable> fFamilyNames;
+    SkTypeface_FreeType::Scanner fScanner;
 
     class StyleSet : public SkFontStyleSet {
     public:
         /** @param parent does not take ownership of the reference.
          *  @param fontSet takes ownership of the reference.
          */
         StyleSet(const SkFontMgr_fontconfig* parent, FcFontSet* fontSet)
             : fFontMgr(SkRef(parent)), fFontSet(fontSet)
         { }
 
@@ skipping 355 matching lines @@
 
     /** @param stream does not take ownership of the reference. */
     virtual SkTypeface* onCreateFromStream(SkStream* stream, int ttcIndex) const SK_OVERRIDE {
         const size_t length = stream->getLength();
         if (length <= 0 || (1u << 30) < length) {
             return NULL;
         }
 
         SkFontStyle style;
         bool isFixedWidth = false;
-        if (!SkTypeface_FreeType::ScanFont(stream, ttcIndex, NULL, &style, &isFixedWidth)) {
+        if (!fScanner.scanFont(stream, ttcIndex, NULL, &style, &isFixedWidth)) {
             return NULL;
         }
 
         return SkNEW_ARGS(SkTypeface_stream, (style, isFixedWidth, ttcIndex,
                                               static_cast<SkStreamAsset*>(stream)));
     }
 
     virtual SkTypeface* onCreateFromData(SkData* data, int ttcIndex) const SK_OVERRIDE {
         SkAutoTUnref<SkStreamAsset> stream(SkNEW_ARGS(SkMemoryStream, (data)));
         return this->createFromStream(stream, ttcIndex);
@@ skipping 18 matching lines @@
             return typeface.detach();
         }
 
         return this->matchFamilyStyle(NULL, style);
     }
 };
 
 SkFontMgr* SkFontMgr::Factory() {
     return SkNEW(SkFontMgr_fontconfig);
 }