Revert of Switch to HarfBuzz on Mac and remove CoreText shaper

Source/platform/fonts/mac/ComplexTextController.h

Index: Source/platform/fonts/mac/ComplexTextController.h
diff --git a/Source/platform/fonts/mac/ComplexTextController.h b/Source/platform/fonts/mac/ComplexTextController.h
new file mode 100644
index 0000000000000000000000000000000000000000..66b42d866828ef4c4bdc18bfa017ef3e04805acc
--- /dev/null
+++ b/Source/platform/fonts/mac/ComplexTextController.h
@@ -0,0 +1,180 @@
+/*
+ * Copyright (C) 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef ComplexTextController_h
+#define ComplexTextController_h
+
+#include "wtf/HashSet.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefCounted.h"
+#include "wtf/RetainPtr.h"
+#include "wtf/text/WTFString.h"
+#include "wtf/unicode/Unicode.h"
+#include "wtf/Vector.h"
+#include <ApplicationServices/ApplicationServices.h>
+
+typedef unsigned short CGGlyph;
+
+typedef const struct __CTRun * CTRunRef;
+typedef const struct __CTLine * CTLineRef;
+
+namespace blink {
+
+class Font;
+class GlyphBuffer;
+class SimpleFontData;
+class TextRun;
+
+enum GlyphIterationStyle { IncludePartialGlyphs, ByWholeGlyphs };
+
+// ComplexTextController is responsible for rendering and measuring glyphs for
+// complex scripts on OS X.
+class ComplexTextController {
+public:
+    ComplexTextController(const Font*, const TextRun&, bool mayUseNaturalWritingDirection = false, HashSet<const SimpleFontData*>* fallbackFonts = 0, bool forTextEmphasis = false);
+
+    // Advance and emit glyphs up to the specified character.
+    void advance(unsigned to, GlyphBuffer* = 0, GlyphIterationStyle = IncludePartialGlyphs, HashSet<const SimpleFontData*>* fallbackFonts = 0);
+
+    // Compute the character offset for a given x coordinate.
+    int offsetForPosition(float x, bool includePartialGlyphs);
+
+    // Returns the width of everything we've consumed so far.
+    float runWidthSoFar() const { return m_runWidthSoFar; }
+
+    float totalWidth() const { return m_totalWidth; }
+
+    float minGlyphBoundingBoxX() const { return m_minGlyphBoundingBoxX; }
+    float maxGlyphBoundingBoxX() const { return m_maxGlyphBoundingBoxX; }
+    float minGlyphBoundingBoxY() const { return m_minGlyphBoundingBoxY; }
+    float maxGlyphBoundingBoxY() const { return m_maxGlyphBoundingBoxY; }
+
+private:
+    class ComplexTextRun : public RefCounted<ComplexTextRun> {
+    public:
+        static PassRefPtr<ComplexTextRun> create(CTRunRef ctRun, const SimpleFontData* fontData, const UChar* characters, unsigned stringLocation, size_t stringLength, CFRange runRange)
+        {
+            return adoptRef(new ComplexTextRun(ctRun, fontData, characters, stringLocation, stringLength, runRange));
+        }
+
+        static PassRefPtr<ComplexTextRun> create(const SimpleFontData* fontData, const UChar* characters, unsigned stringLocation, size_t stringLength, bool ltr)
+        {
+            return adoptRef(new ComplexTextRun(fontData, characters, stringLocation, stringLength, ltr));
+        }
+
+        unsigned glyphCount() const { return m_glyphCount; }
+        const SimpleFontData* fontData() const { return m_fontData; }
+        const UChar* characters() const { return m_characters; }
+        unsigned stringLocation() const { return m_stringLocation; }
+        size_t stringLength() const { return m_stringLength; }
+        ALWAYS_INLINE CFIndex indexAt(size_t i) const;
+        CFIndex indexBegin() const { return m_indexBegin; }
+        CFIndex indexEnd() const { return m_indexEnd; }
+        CFIndex endOffsetAt(size_t i) const { ASSERT(!m_isMonotonic); return m_glyphEndOffsets[i]; }
+        const CGGlyph* glyphs() const { return m_glyphs; }
+        const CGSize* advances() const { return m_advances; }
+        bool isLTR() const { return m_isLTR; }
+        bool isMonotonic() const { return m_isMonotonic; }
+        void setIsNonMonotonic();
+
+    private:
+        ComplexTextRun(CTRunRef, const SimpleFontData*, const UChar* characters, unsigned stringLocation, size_t stringLength, CFRange runRange);
+        ComplexTextRun(const SimpleFontData*, const UChar* characters, unsigned stringLocation, size_t stringLength, bool ltr);
+
+        unsigned m_glyphCount;
+        const SimpleFontData* m_fontData;
+        const UChar* m_characters;
+        unsigned m_stringLocation;
+        size_t m_stringLength;
+        Vector<CFIndex, 64> m_coreTextIndicesVector;
+        const CFIndex* m_coreTextIndices;
+        CFIndex m_indexBegin;
+        CFIndex m_indexEnd;
+        Vector<CFIndex, 64> m_glyphEndOffsets;
+        Vector<CGGlyph, 64> m_glyphsVector;
+        const CGGlyph* m_glyphs;
+        Vector<CGSize, 64> m_advancesVector;
+        const CGSize* m_advances;
+        bool m_isLTR;
+        bool m_isMonotonic;
+    };
+
+    static unsigned stringBegin(const ComplexTextRun& run) { return run.stringLocation() + run.indexBegin(); }
+    static unsigned stringEnd(const ComplexTextRun& run) { return run.stringLocation() + run.indexEnd(); }
+
+    void collectComplexTextRuns();
+
+    void collectComplexTextRunsForCharacters(const UChar*, unsigned length, unsigned stringLocation, const SimpleFontData*);
+    void adjustGlyphsAndAdvances();
+
+    unsigned findNextRunIndex(unsigned runIndex) const;
+    unsigned indexOfCurrentRun(unsigned& leftmostGlyph);
+    unsigned incrementCurrentRun(unsigned& leftmostGlyph);
+
+    // The initial capacity of these vectors was selected as being the smallest power of two greater than
+    // the average (3.5) plus one standard deviation (7.5) of nonzero sizes used on Arabic Wikipedia.
+    Vector<unsigned, 16> m_runIndices;
+    Vector<unsigned, 16> m_glyphCountFromStartToIndex;
+
+    const Font& m_font;
+    const TextRun& m_run;
+    bool m_isLTROnly;
+    bool m_mayUseNaturalWritingDirection;
+    bool m_forTextEmphasis;
+
+    Vector<String> m_stringsFor8BitRuns;
+    Vector<UChar, 256> m_smallCapsBuffer;
+
+    // Retain lines rather than their runs for better performance.
+    Vector<RetainPtr<CTLineRef> > m_coreTextLines;
+    Vector<RefPtr<ComplexTextRun>, 16> m_complexTextRuns;
+    Vector<CGSize, 256> m_adjustedAdvances;
+    Vector<CGGlyph, 256> m_adjustedGlyphs;
+
+    unsigned m_currentCharacter;
+    int m_end;
+
+    CGFloat m_totalWidth;
+
+    float m_runWidthSoFar;
+    unsigned m_numGlyphsSoFar;
+    size_t m_currentRun;
+    unsigned m_glyphInCurrentRun;
+    unsigned m_characterInCurrentGlyph;
+    float m_expansion;
+    float m_expansionPerOpportunity;
+    float m_leadingExpansion;
+    bool m_afterExpansion;
+
+    HashSet<const SimpleFontData*>* m_fallbackFonts;
+
+    float m_minGlyphBoundingBoxX;
+    float m_maxGlyphBoundingBoxX;
+    float m_minGlyphBoundingBoxY;
+    float m_maxGlyphBoundingBoxY;
+};
+
+} // namespace blink
+
+#endif // ComplexTextController_h