Correcting text baseline for tiny fonts

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

 /*
  * This file is part of the internal font implementation.
  *
  * Copyright (C) 2006, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2007-2008 Torch Mobile, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 42 matching lines @@
   SmallCapsVariant,
   EmphasisMarkVariant
 };
 
 class PLATFORM_EXPORT SimpleFontData : public FontData {
  public:
   // Used to create platform fonts.
   static PassRefPtr<SimpleFontData> create(
       const FontPlatformData& platformData,
       PassRefPtr<CustomFontData> customData = nullptr,
-      bool isTextOrientationFallback = false) {
+      bool isTextOrientationFallback = false,
+      bool subpixelAscentDescent = false) {
     return adoptRef(new SimpleFontData(platformData, std::move(customData),
-                                       isTextOrientationFallback));
+                                       isTextOrientationFallback,
+                                       subpixelAscentDescent));
   }
 
   ~SimpleFontData() override;
 
   const FontPlatformData& platformData() const { return m_platformData; }
   const OpenTypeVerticalData* verticalData() const {
     return m_verticalData.get();
   }
 
   PassRefPtr<SimpleFontData> smallCapsFontData(const FontDescription&) const;
@@ skipping 78 matching lines @@
   // Implemented by the platform.
   virtual bool fillGlyphPage(GlyphPage* pageToFill,
                              unsigned offset,
                              unsigned length,
                              UChar* buffer,
                              unsigned bufferLength) const;
 
  protected:
   SimpleFontData(const FontPlatformData&,
                  PassRefPtr<CustomFontData> customData,
-                 bool isTextOrientationFallback = false);
+                 bool isTextOrientationFallback = false,
+                 bool subpixelAscentDescent = false);
 
   SimpleFontData(PassRefPtr<CustomFontData> customData,
                  float fontSize,
                  bool syntheticBold,
                  bool syntheticItalic);
 
  private:
-  void platformInit();
+  void platformInit(bool subpixelAscentDescent);
   void platformGlyphInit();
 
   PassRefPtr<SimpleFontData> createScaledFontData(const FontDescription&,
                                                   float scaleFactor) const;
 
   FontMetrics m_fontMetrics;
   float m_maxCharWidth;
   float m_avgCharWidth;
 
   FontPlatformData m_platformData;
@@ skipping 73 matching lines @@
 
   m_glyphToWidthMap.setMetricsForGlyph(glyph, width);
   return width;
 #endif
 }
 
 DEFINE_FONT_DATA_TYPE_CASTS(SimpleFontData, false);
 
 }  // namespace blink
 #endif  // SimpleFontData_h