Reland: Use FontFallbackPriority Fonts in FontFallbackIterator

third_party/WebKit/Source/platform/fonts/FontFallbackIterator.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef FontFallbackIterator_h
 #define FontFallbackIterator_h
 
 #include "platform/fonts/FontDataRange.h"
+#include "platform/fonts/FontFallbackPriority.h"
 #include "wtf/HashMap.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 #include "wtf/text/Unicode.h"
 
 namespace blink {
 
 using namespace WTF;
 
 class FontDescription;
 class FontFallbackList;
 class SimpleFontData;
 struct FontDataRange;
 class FontFamily;
 
 class FontFallbackIterator : public RefCounted<FontFallbackIterator> {
     WTF_MAKE_NONCOPYABLE(FontFallbackIterator);
 
 public:
-    static PassRefPtr<FontFallbackIterator> create(const FontDescription&, PassRefPtr<FontFallbackList>);
+    static PassRefPtr<FontFallbackIterator> create(const FontDescription&, PassRefPtr<FontFallbackList>,
+        FontFallbackPriority);
 
     // Returns whether a list of all remaining characters to be shaped is
     // needed.  Needed by the FontfallbackIterator in order to check whether a
     // font from a segmented range should be loaded.
     bool needsHintList() const;
 
     bool hasNext() const { return m_fallbackStage != OutOfLuck; };
 
     // Some system fallback APIs (Windows, Android) require a character, or a
     // portion of the string to be passed.  On Mac and Linux, we get a list of
     // fonts without passing in characters.
     const FontDataRange next(const Vector<UChar32>& hintList);
 
 private:
-    FontFallbackIterator(const FontDescription&, PassRefPtr<FontFallbackList>);
+    FontFallbackIterator(const FontDescription&, PassRefPtr<FontFallbackList>,
+        FontFallbackPriority);
     bool rangeContributesForHint(const Vector<UChar32> hintList, const FontDataRange&);
     bool alreadyLoadingRangeForHintChar(UChar32 hintChar);
     void willUseRange(const AtomicString& family, const FontDataRange&);
 
+    const PassRefPtr<SimpleFontData> fallbackPriorityFont(UChar32 hint);
     const PassRefPtr<SimpleFontData> uniqueSystemFontForHint(UChar32 hint);
 
     const FontDescription& m_fontDescription;
     RefPtr<FontFallbackList> m_fontFallbackList;
     int m_currentFontDataIndex;
     unsigned m_segmentedIndex;
 
     enum FallbackStage {
+        FallbackPriorityFonts,
         FontGroupFonts,
         SegmentedFace,
         PreferencesFonts,
         SystemFonts,
         OutOfLuck
     };
 
     FallbackStage m_fallbackStage;
     HashMap<UChar32, RefPtr<SimpleFontData>> m_visitedSystemFonts;
     Vector<FontDataRange> m_loadingCustomFontForRanges;
+    FontFallbackPriority m_fontFallbackPriority;
 };
 
 } // namespace blink
 
 #endif