TextBlob: Start caching a text blob per InlineTextBox.

Source/platform/fonts/Font.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Holger Hans Peter Freyther
  *
  * 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
@@ skipping 117 matching lines @@
         return glyphDataAndPageForCharacter(c, mirror, variant).first;
     }
 #if OS(MACOSX)
     const SimpleFontData* fontDataForCombiningCharacterSequence(const UChar*, size_t length, FontDataVariant) const;
 #endif
     std::pair<GlyphData, GlyphPage*> glyphDataAndPageForCharacter(UChar32, bool mirror, FontDataVariant = AutoVariant) const;
     bool primaryFontHasGlyphForCharacter(UChar32) const;
 
     CodePath codePath(const TextRun&) const;
 
+    PassTextBlobPtr buildTextBlob(const TextRunPaintInfo&, const FloatPoint& textOrigin, bool couldUseLCDRenderedText, CustomFontNotReadyAction = DoNotPaintIfFontNotReady) const;
+    void drawTextBlob(GraphicsContext*, const SkTextBlob*, const SkPoint& origin) const;
+
 private:
     enum ForTextEmphasisOrNot { NotForTextEmphasis, ForTextEmphasis };
 
     // Returns the initial in-stream advance.
     float getGlyphsAndAdvancesForSimpleText(const TextRunPaintInfo&, GlyphBuffer&, ForTextEmphasisOrNot = NotForTextEmphasis) const;
     float drawSimpleText(GraphicsContext*, const TextRunPaintInfo&, const FloatPoint&) const;
     void drawEmphasisMarksForSimpleText(GraphicsContext*, const TextRunPaintInfo&, const AtomicString& mark, const FloatPoint&) const;
     void drawGlyphs(GraphicsContext*, const SimpleFontData*, const GlyphBuffer&, unsigned from, unsigned numGlyphs, const FloatPoint&, const FloatRect& textRect) const;
     float drawGlyphBuffer(GraphicsContext*, const TextRunPaintInfo&, const GlyphBuffer&, const FloatPoint&) const;
-    void drawTextBlob(GraphicsContext*, const SkTextBlob*, const SkPoint& origin) const;
     void drawEmphasisMarks(GraphicsContext*, const TextRunPaintInfo&, const GlyphBuffer&, const AtomicString&, const FloatPoint&) const;
     float floatWidthForSimpleText(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, IntRectExtent* glyphBounds = 0) const;
     int offsetForPositionForSimpleText(const TextRun&, float position, bool includePartialGlyphs) const;
     FloatRect selectionRectForSimpleText(const TextRun&, const FloatPoint&, int h, int from, int to, bool accountForGlyphBounds) const;
 
     bool getEmphasisMarkGlyphData(const AtomicString&, GlyphData&) const;
 
     // Returns the initial in-stream advance.
     float getGlyphsAndAdvancesForComplexText(const TextRunPaintInfo&, GlyphBuffer&, ForTextEmphasisOrNot = NotForTextEmphasis) const;
     float drawComplexText(GraphicsContext*, const TextRunPaintInfo&, const FloatPoint&) const;
     void drawEmphasisMarksForComplexText(GraphicsContext*, const TextRunPaintInfo&, const AtomicString& mark, const FloatPoint&) const;
     float floatWidthForComplexText(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts, IntRectExtent* glyphBounds) const;
     int offsetForPositionForComplexText(const TextRun&, float position, bool includePartialGlyphs) const;
     FloatRect selectionRectForComplexText(const TextRun&, const FloatPoint&, int h, int from, int to) const;
 
+    PassTextBlobPtr buildTextBlobForSimpleText(const TextRunPaintInfo&, const FloatPoint& textOrigin, bool couldUseLCDRenderedText) const;
+    PassTextBlobPtr buildTextBlob(const GlyphBuffer&, float initialAdvance, const FloatRect& bounds, float& advance, bool couldUseLCD) const;
+
     friend struct WidthIterator;
     friend class SVGTextRunRenderingContext;
 
 public:
     // Useful for debugging the different font rendering code paths.
     static void setCodePath(CodePath);
     static CodePath codePath();
     static CodePath s_codePath;
 
     FontSelector* fontSelector() const;
 
     FontFallbackList* fontList() const { return m_fontFallbackList.get(); }
 
     void willUseFontData(UChar32) const;
 
     static FloatRect pixelSnappedSelectionRect(float fromX, float toX, float y, float height);
 private:
     bool loadingCustomFonts() const
     {
         return m_fontFallbackList && m_fontFallbackList->loadingCustomFonts();
     }
 
     bool shouldSkipDrawing() const
     {
         return m_fontFallbackList && m_fontFallbackList->shouldSkipDrawing();
     }
 
-    PassTextBlobPtr buildTextBlob(const GlyphBuffer&, float initialAdvance, const FloatRect& bounds,
-        float& advance, bool couldUseLCD) const;
-
     FontDescription m_fontDescription;
     mutable RefPtr<FontFallbackList> m_fontFallbackList;
 };
 
 inline Font::~Font()
 {
 }
 
 inline const SimpleFontData* Font::primaryFont() const
 {
@@ skipping 22 matching lines @@
 {
     if (!tabSize)
         return fontDescription().letterSpacing();
     float tabWidth = tabSize * fontData.spaceWidth() + fontDescription().letterSpacing();
     return tabWidth - fmodf(position, tabWidth);
 }
 
 } // namespace blink
 
 #endif