More or less implement RenderTextHarfBuzz

ui/gfx/render_text.h

 // Copyright (c) 2012 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 UI_GFX_RENDER_TEXT_H_
 #define UI_GFX_RENDER_TEXT_H_
 
 #include <algorithm>
 #include <cstring>
 #include <string>
@@ skipping 76 matching lines @@
     DiagonalStrike(Canvas* canvas, Point start, const SkPaint& paint);
     ~DiagonalStrike();
 
     void AddPiece(int length, SkColor color);
     void Draw();
 
    private:
     typedef std::pair<int, SkColor> Piece;
 
     Canvas* canvas_;
+    SkMatrix matrix_;
     const Point start_;
     SkPaint paint_;
     int total_length_;
     std::vector<Piece> pieces_;
 
     DISALLOW_COPY_AND_ASSIGN(DiagonalStrike);
   };
 
   Canvas* canvas_;
   SkCanvas* canvas_skia_;
@@ skipping 62 matching lines @@
   // heights.
   Size size;
 
   // Sum of preceding lines' heights.
   int preceding_heights;
 
   // Maximum baseline of all segments on this line.
   int baseline;
 };
 
+// Creates an SkTypeface from a font |family| name and a |gfx::Font::FontStyle|.
+skia::RefPtr<SkTypeface> CreateSkiaTypeface(const std::string& family,
+                                            int style);
+
 }  // namespace internal
 
 // RenderText represents an abstract model of styled text and its corresponding
 // visual layout. Support is built in for a cursor, a selection, simple styling,
 // complex scripts, and bi-directional text. Implementations provide mechanisms
 // for rendering and translation between logical and visual data.
 class GFX_EXPORT RenderText {
  public:
   virtual ~RenderText();
 
-  // Creates a platform-specific RenderText instance.
+  // Creates a platform-specific or cross-platform RenderText instance.
   static RenderText* CreateInstance();
 
   const base::string16& text() const { return text_; }
   void SetText(const base::string16& text);
 
   HorizontalAlignment horizontal_alignment() const {
     return horizontal_alignment_;
   }
   void SetHorizontalAlignment(HorizontalAlignment alignment);
 
@@ skipping 362 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, TruncatedObscuredText);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, GraphemePositions);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, EdgeSelectionModels);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, GetTextOffset);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, GetTextOffsetHorizontalDefaultInRTL);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_MinWidth);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_NormalWidth);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_SufficientWidth);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_Newline);
 
+  // Creates a platform-specific RenderText instance.
+  static RenderText* CreateNativeInstance();
+
   // Set the cursor to |position|, with the caret trailing the previous
   // grapheme, or if there is no previous grapheme, leading the cursor position.
   // If |select| is false, the selection start is moved to the same position.
   // If the |position| is not a cursorable position (not on grapheme boundary),
   // it is a NO-OP.
   void MoveCursorTo(size_t position, bool select);
 
   // Updates |layout_text_| if the text is obscured or truncated.
   void UpdateLayoutText();
 
@@ skipping 121 matching lines @@
   // Lines computed by EnsureLayout. These should be invalidated with
   // ResetLayout and on |display_rect_| changes.
   std::vector<internal::Line> lines_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_H_