Switch to HarfBuzz on Mac and remove CoreText shaper

Source/platform/fonts/mac/SimpleFontDataCoreText.cpp

Index: Source/platform/fonts/mac/SimpleFontDataCoreText.cpp
diff --git a/Source/platform/fonts/mac/SimpleFontDataCoreText.cpp b/Source/platform/fonts/mac/SimpleFontDataCoreText.cpp
deleted file mode 100644
index ec5a5f1805b77f2fb34465e99764be686dbd1dc8..0000000000000000000000000000000000000000
--- a/Source/platform/fonts/mac/SimpleFontDataCoreText.cpp
+++ /dev/null
@@ -1,201 +0,0 @@
-/*
- * Copyright (C) 2005, 2006, 2012 Apple Inc. All rights reserved.
- * Copyright (C) 2006 Alexey Proskuryakov
- *
- * 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.
- */
-
-#include "config.h"
-#include "platform/fonts/SimpleFontData.h"
-
-#include "platform/fonts/Character.h"
-#include "platform/fonts/Font.h"
-#include "platform/fonts/GlyphPage.h"
-#include <ApplicationServices/ApplicationServices.h>
-
-// Forward declare Mac SPIs.
-// Request for public API: rdar://13787589
-extern "C" {
-void CGFontGetGlyphsForUnichars(CGFontRef, const UniChar chars[], CGGlyph glyphs[], size_t length);
-}
-
-namespace blink {
-
-CFDictionaryRef SimpleFontData::getCFStringAttributes(TypesettingFeatures typesettingFeatures, FontOrientation orientation) const
-{
-    unsigned key = typesettingFeatures + 1;
-    HashMap<unsigned, RetainPtr<CFDictionaryRef> >::AddResult addResult = m_CFStringAttributes.add(key, RetainPtr<CFDictionaryRef>());
-    RetainPtr<CFDictionaryRef>& attributesDictionary = addResult.storedValue->value;
-    if (!addResult.isNewEntry)
-        return attributesDictionary.get();
-
-    attributesDictionary.adoptCF(CFDictionaryCreateMutable(kCFAllocatorDefault, 4, &kCFCopyStringDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks));
-    CFMutableDictionaryRef mutableAttributes = (CFMutableDictionaryRef)attributesDictionary.get();
-
-    CFDictionarySetValue(mutableAttributes, kCTFontAttributeName, platformData().ctFont());
-
-    if (!(typesettingFeatures & Kerning)) {
-        const float zero = 0;
-        static CFNumberRef zeroKerningValue = CFNumberCreate(kCFAllocatorDefault, kCFNumberFloatType, &zero);
-        CFDictionarySetValue(mutableAttributes, kCTKernAttributeName, zeroKerningValue);
-    }
-
-    bool allowLigatures = (orientation == Horizontal && platformData().allowsLigatures()) || (typesettingFeatures & Ligatures);
-    if (!allowLigatures) {
-        const int zero = 0;
-        static CFNumberRef essentialLigaturesValue = CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &zero);
-        CFDictionarySetValue(mutableAttributes, kCTLigatureAttributeName, essentialLigaturesValue);
-    }
-
-    if (orientation == Vertical)
-        CFDictionarySetValue(mutableAttributes, kCTVerticalFormsAttributeName, kCFBooleanTrue);
-
-    return attributesDictionary.get();
-}
-
-static bool shouldUseCoreText(UChar* buffer, unsigned bufferLength, const SimpleFontData* fontData)
-{
-    if (fontData->platformData().isCompositeFontReference())
-        return true;
-
-    // CoreText doesn't have vertical glyphs of surrogate pair characters.
-    // Therefore, we should not use CoreText, but this always returns horizontal glyphs.
-    // FIXME: We should use vertical glyphs. https://code.google.com/p/chromium/issues/detail?id=340173
-    if (bufferLength >= 2 && U_IS_SURROGATE(buffer[0]) && fontData->hasVerticalGlyphs()) {
-        ASSERT(U_IS_SURROGATE_LEAD(buffer[0]));
-        ASSERT(U_IS_TRAIL(buffer[1]));
-        return false;
-    }
-
-    if (fontData->platformData().widthVariant() != RegularWidth || fontData->hasVerticalGlyphs()) {
-        // Ideographs don't have a vertical variant or width variants.
-        for (unsigned i = 0; i < bufferLength; ++i) {
-            if (!Character::isCJKIdeograph(buffer[i]))
-                return true;
-        }
-    }
-
-    return false;
-}
-
-bool SimpleFontData::fillGlyphPage(GlyphPage* pageToFill, unsigned offset, unsigned length, UChar* buffer, unsigned bufferLength) const
-{
-    bool haveGlyphs = false;
-
-    Vector<CGGlyph, 512> glyphs(bufferLength);
-    if (!shouldUseCoreText(buffer, bufferLength, this)) {
-        CGFontGetGlyphsForUnichars(platformData().cgFont(), buffer, glyphs.data(), bufferLength);
-        for (unsigned i = 0; i < length; ++i) {
-            if (glyphs[i]) {
-                pageToFill->setGlyphDataForIndex(offset + i, glyphs[i], this);
-                haveGlyphs = true;
-            }
-        }
-    } else if (!platformData().isCompositeFontReference() && platformData().widthVariant() != RegularWidth
-        && CTFontGetGlyphsForCharacters(platformData().ctFont(), buffer, glyphs.data(), bufferLength)) {
-        // When buffer consists of surrogate pairs, CTFontGetGlyphsForCharacters
-        // places the glyphs at indices corresponding to the first character of each pair.
-        unsigned glyphStep = bufferLength / length;
-        for (unsigned i = 0; i < length; ++i) {
-            if (glyphs[i * glyphStep]) {
-                pageToFill->setGlyphDataForIndex(offset + i, glyphs[i * glyphStep], this);
-                haveGlyphs = true;
-            }
-        }
-    } else {
-        // We ask CoreText for possible vertical variant glyphs
-        RetainPtr<CFStringRef> string(AdoptCF, CFStringCreateWithCharactersNoCopy(kCFAllocatorDefault, buffer, bufferLength, kCFAllocatorNull));
-        RetainPtr<CFAttributedStringRef> attributedString(AdoptCF, CFAttributedStringCreate(kCFAllocatorDefault, string.get(), getCFStringAttributes(0, hasVerticalGlyphs() ? Vertical : Horizontal)));
-        RetainPtr<CTLineRef> line(AdoptCF, CTLineCreateWithAttributedString(attributedString.get()));
-
-        CFArrayRef runArray = CTLineGetGlyphRuns(line.get());
-        CFIndex runCount = CFArrayGetCount(runArray);
-
-        Vector<CGGlyph, 512> glyphVector;
-        Vector<CFIndex, 512> indexVector;
-        bool done = false;
-
-        // For the CGFont comparison in the loop, use the CGFont that Core Text assigns to the CTFont. This may
-        // be non-CFEqual to platformData().cgFont().
-        RetainPtr<CGFontRef> cgFont(AdoptCF, CTFontCopyGraphicsFont(platformData().ctFont(), 0));
-
-        for (CFIndex r = 0; r < runCount && !done ; ++r) {
-            // CTLine could map characters over multiple fonts using its own font fallback list.
-            // We need to pick runs that use the exact font we need, i.e., platformData().ctFont().
-            CTRunRef ctRun = static_cast<CTRunRef>(CFArrayGetValueAtIndex(runArray, r));
-            ASSERT(CFGetTypeID(ctRun) == CTRunGetTypeID());
-
-            CFDictionaryRef attributes = CTRunGetAttributes(ctRun);
-            CTFontRef runFont = static_cast<CTFontRef>(CFDictionaryGetValue(attributes, kCTFontAttributeName));
-            RetainPtr<CGFontRef> runCGFont(AdoptCF, CTFontCopyGraphicsFont(runFont, 0));
-            // Use CGFont here as CFEqual for CTFont counts all attributes for font.
-            bool gotBaseFont = CFEqual(cgFont.get(), runCGFont.get());
-            if (gotBaseFont || platformData().isCompositeFontReference()) {
-                // This run uses the font we want. Extract glyphs.
-                CFIndex glyphCount = CTRunGetGlyphCount(ctRun);
-                const CGGlyph* glyphs = CTRunGetGlyphsPtr(ctRun);
-                if (!glyphs) {
-                    glyphVector.resize(glyphCount);
-                    CTRunGetGlyphs(ctRun, CFRangeMake(0, 0), glyphVector.data());
-                    glyphs = glyphVector.data();
-                }
-                const CFIndex* stringIndices = CTRunGetStringIndicesPtr(ctRun);
-                if (!stringIndices) {
-                    indexVector.resize(glyphCount);
-                    CTRunGetStringIndices(ctRun, CFRangeMake(0, 0), indexVector.data());
-                    stringIndices = indexVector.data();
-                }
-
-                if (gotBaseFont) {
-                    for (CFIndex i = 0; i < glyphCount; ++i) {
-                        if (stringIndices[i] >= static_cast<CFIndex>(length)) {
-                            done = true;
-                            break;
-                        }
-                        if (glyphs[i]) {
-                            pageToFill->setGlyphDataForIndex(offset + stringIndices[i], glyphs[i], this);
-                            haveGlyphs = true;
-                        }
-                    }
-                } else {
-                    const SimpleFontData* runSimple = getCompositeFontReferenceFontData((NSFont *)runFont);
-                    if (runSimple) {
-                        for (CFIndex i = 0; i < glyphCount; ++i) {
-                            if (stringIndices[i] >= static_cast<CFIndex>(length)) {
-                                done = true;
-                                break;
-                            }
-                            if (glyphs[i]) {
-                                pageToFill->setGlyphDataForIndex(offset + stringIndices[i], glyphs[i], runSimple);
-                                haveGlyphs = true;
-                            }
-                        }
-                    }
-                }
-            }
-        }
-    }
-
-    return haveGlyphs;
-}
-
-} // namespace blink