Implement SkFontMgr_Custom::onCreateFromFontData.

src/ports/SkFontMgr_custom.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkFontDescriptor.h"
 #include "SkFontHost_FreeType_common.h"
 #include "SkFontMgr.h"
@@ skipping 273 matching lines @@
         const FontParameters::Axis* paramAxes = params.getAxes(&paramAxisCount);
         SkAutoSTMalloc<4, SkFixed> axisValues(axisDefinitions.count());
         Scanner::computeAxisValues(axisDefinitions, paramAxes, paramAxisCount, axisValues, name);
 
         std::unique_ptr<SkFontData> data(new SkFontData(stream.release(),
                                                         params.getCollectionIndex(),
                                                         axisValues.get(), axisDefinitions.count()));
         return new SkTypeface_Stream(std::move(data), style, isFixedPitch, false, name);
     }
 
+    SkTypeface* onCreateFromFontData(SkFontData* data) const override {
+        bool isFixedPitch;
+        SkFontStyle style;
+        SkString name;
+        if (!fScanner.scanFont(data->getStream(), data->getIndex(),
+                               &name, &style, &isFixedPitch, nullptr))
+        {
+            return nullptr;
+        }
+        std::unique_ptr<SkFontData> unique_data(data);

[bungeman-skia, 2016/06/10 18:32:11]

Since no one outside Skia is using this right now, the next CL is to update the
interface to just take std::unique_ptr<SkFontData>.

+        return new SkTypeface_Stream(unique_data, style, isFixedPitch, false, name);
+    }
+
     SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const override {
         SkAutoTDelete<SkStreamAsset> stream(SkStream::NewFromFile(path));
         return stream.get() ? this->createFromStream(stream.release(), ttcIndex) : nullptr;
     }
 
     SkTypeface* onLegacyCreateTypeface(const char familyName[], SkFontStyle style) const override {
         SkTypeface* tf = nullptr;
 
         if (familyName) {
             tf = this->onMatchFamilyStyle(familyName, style);
@@ skipping 193 matching lines @@
         SkFontStyleSet_Custom* family = new SkFontStyleSet_Custom(SkString());
         families->push_back().reset(family);
         family->appendTypeface(sk_make_sp<SkTypeface_Empty>());
     }
 
 };
 
 SK_API SkFontMgr* SkFontMgr_New_Custom_Empty() {
     return new SkFontMgr_Custom(EmptyFontLoader());
 }