Revert of Switch to HarfBuzz on Mac and remove CoreText shaper

Source/platform/fonts/mac/FontComplexTextMac.cpp

Index: Source/platform/fonts/mac/FontComplexTextMac.cpp
diff --git a/Source/platform/fonts/mac/FontComplexTextMac.cpp b/Source/platform/fonts/mac/FontComplexTextMac.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d0dcac0af5b5fbab7f810c25c3db2502f6c0a89c
--- /dev/null
+++ b/Source/platform/fonts/mac/FontComplexTextMac.cpp
@@ -0,0 +1,209 @@
+/*
+ * Copyright (C) 2006, 2007, 2008, 2009 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.
+ */
+
+#include "config.h"
+#include "platform/fonts/Font.h"
+
+#include "platform/fonts/Character.h"
+#include "platform/fonts/FontFallbackList.h"
+#include "platform/fonts/GlyphBuffer.h"
+#include "platform/fonts/SimpleFontData.h"
+#include "platform/fonts/harfbuzz/HarfBuzzShaper.h"
+#include "platform/fonts/mac/ComplexTextController.h"
+#include "platform/geometry/IntRect.h"
+#include "platform/graphics/GraphicsContext.h"
+#include "platform/text/TextRun.h"
+#include "wtf/MathExtras.h"
+
+namespace blink {
+
+static bool preferHarfBuzz(const Font* font)
+{
+    const FontDescription& description = font->fontDescription();
+    return description.featureSettings() && description.featureSettings()->size() > 0;
+}
+
+FloatRect Font::selectionRectForComplexText(const TextRun& run, const FloatPoint& point, int h,
+                                            int from, int to) const
+{
+    if (preferHarfBuzz(this)) {
+        HarfBuzzShaper shaper(this, run);
+        if (shaper.shape())
+            return shaper.selectionRect(point, h, from, to);
+    }
+    ComplexTextController controller(this, run);
+    controller.advance(from);
+    float beforeWidth = controller.runWidthSoFar();
+    controller.advance(to);
+    float afterWidth = controller.runWidthSoFar();
+
+    // Using roundf() rather than ceilf() for the right edge as a compromise to ensure correct caret positioning
+    if (run.rtl()) {
+        float totalWidth = controller.totalWidth();
+        return FloatRect(floorf(point.x() + totalWidth - afterWidth), point.y(), roundf(point.x() + totalWidth - beforeWidth) - floorf(point.x() + totalWidth - afterWidth), h);
+    }
+
+    return FloatRect(floorf(point.x() + beforeWidth), point.y(), roundf(point.x() + afterWidth) - floorf(point.x() + beforeWidth), h);
+}
+
+float Font::getGlyphsAndAdvancesForComplexText(const TextRunPaintInfo& runInfo, GlyphBuffer& glyphBuffer, ForTextEmphasisOrNot forTextEmphasis) const
+{
+    float initialAdvance;
+
+    ComplexTextController controller(this, runInfo.run, false, 0, forTextEmphasis);
+    controller.advance(runInfo.from);
+    float beforeWidth = controller.runWidthSoFar();
+    controller.advance(runInfo.to, &glyphBuffer);
+
+    if (glyphBuffer.isEmpty())
+        return 0;
+
+    float afterWidth = controller.runWidthSoFar();
+
+    if (runInfo.run.rtl()) {
+        initialAdvance = controller.totalWidth() - afterWidth;
+        glyphBuffer.reverse();
+    } else
+        initialAdvance = beforeWidth;
+
+    return initialAdvance;
+}
+
+float Font::drawComplexText(GraphicsContext* context, const TextRunPaintInfo& runInfo, const FloatPoint& point) const
+{
+    if (preferHarfBuzz(this)) {
+        GlyphBuffer glyphBuffer;
+        HarfBuzzShaper shaper(this, runInfo.run);
+        shaper.setDrawRange(runInfo.from, runInfo.to);
+        if (shaper.shape(&glyphBuffer)) {
+            return drawGlyphBuffer(context, runInfo, glyphBuffer, point);
+        }
+    }
+    // This glyph buffer holds our glyphs + advances + font data for each glyph.
+    GlyphBuffer glyphBuffer;
+
+    float startX = point.x() + getGlyphsAndAdvancesForComplexText(runInfo, glyphBuffer);
+
+    // We couldn't generate any glyphs for the run.  Give up.
+    if (glyphBuffer.isEmpty())
+        return 0;
+
+    // Draw the glyph buffer now at the starting point returned in startX.
+    FloatPoint startPoint(startX, point.y());
+    return drawGlyphBuffer(context, runInfo, glyphBuffer, startPoint);
+}
+
+void Font::drawEmphasisMarksForComplexText(GraphicsContext* context, const TextRunPaintInfo& runInfo, const AtomicString& mark, const FloatPoint& point) const
+{
+    GlyphBuffer glyphBuffer;
+    float initialAdvance = getGlyphsAndAdvancesForComplexText(runInfo, glyphBuffer, ForTextEmphasis);
+
+    if (glyphBuffer.isEmpty())
+        return;
+
+    drawEmphasisMarks(context, runInfo, glyphBuffer, mark, FloatPoint(point.x() + initialAdvance, point.y()));
+}
+
+float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, IntRectExtent* glyphBounds) const
+{
+    if (preferHarfBuzz(this)) {
+        HarfBuzzShaper shaper(this, run);
+        if (shaper.shape())
+            return shaper.totalWidth();
+    }
+    ComplexTextController controller(this, run, true, fallbackFonts);
+    glyphBounds->setTop(floorf(-controller.minGlyphBoundingBoxY()));
+    glyphBounds->setBottom(ceilf(controller.maxGlyphBoundingBoxY()));
+    glyphBounds->setLeft(std::max<int>(0, floorf(-controller.minGlyphBoundingBoxX())));
+    glyphBounds->setRight(std::max<int>(0, ceilf(controller.maxGlyphBoundingBoxX() - controller.totalWidth())));
+
+    return controller.totalWidth();
+}
+
+int Font::offsetForPositionForComplexText(const TextRun& run, float x, bool includePartialGlyphs) const
+{
+    if (preferHarfBuzz(this)) {
+        HarfBuzzShaper shaper(this, run);
+        if (shaper.shape())
+            return shaper.offsetForPosition(x);
+    }
+    ComplexTextController controller(this, run);
+    return controller.offsetForPosition(x, includePartialGlyphs);
+}
+
+const SimpleFontData* Font::fontDataForCombiningCharacterSequence(const UChar* characters, size_t length, FontDataVariant variant) const
+{
+    UChar32 baseCharacter;
+    size_t baseCharacterLength = 0;
+    U16_NEXT(characters, baseCharacterLength, length, baseCharacter);
+
+    GlyphData baseCharacterGlyphData = glyphDataForCharacter(baseCharacter, false, false, variant);
+
+    if (!baseCharacterGlyphData.glyph)
+        return 0;
+
+    if (length == baseCharacterLength)
+        return baseCharacterGlyphData.fontData;
+
+    bool triedBaseCharacterFontData = false;
+
+    unsigned i = 0;
+    for (const FontData* fontData = fontDataAt(0); fontData; fontData = fontDataAt(++i)) {
+        const SimpleFontData* simpleFontData = fontData->fontDataForCharacter(baseCharacter);
+        if (variant == NormalVariant) {
+            if (simpleFontData->platformData().orientation() == Vertical) {
+                if (Character::isCJKIdeographOrSymbol(baseCharacter) && !simpleFontData->hasVerticalGlyphs()) {
+                    variant = BrokenIdeographVariant;
+                    simpleFontData = simpleFontData->brokenIdeographFontData().get();
+                } else if (m_fontDescription.nonCJKGlyphOrientation() == NonCJKGlyphOrientationVerticalRight) {
+                    SimpleFontData* verticalRightFontData = simpleFontData->verticalRightOrientationFontData().get();
+                    Glyph verticalRightGlyph = verticalRightFontData->glyphForCharacter(baseCharacter);
+                    if (verticalRightGlyph == baseCharacterGlyphData.glyph)
+                        simpleFontData = verticalRightFontData;
+                } else {
+                    SimpleFontData* uprightFontData = simpleFontData->uprightOrientationFontData().get();
+                    Glyph uprightGlyph = uprightFontData->glyphForCharacter(baseCharacter);
+                    if (uprightGlyph != baseCharacterGlyphData.glyph)
+                        simpleFontData = uprightFontData;
+                }
+            }
+        } else {
+            if (const SimpleFontData* variantFontData = simpleFontData->variantFontData(m_fontDescription, variant).get())
+                simpleFontData = variantFontData;
+        }
+
+        if (simpleFontData == baseCharacterGlyphData.fontData)
+            triedBaseCharacterFontData = true;
+
+        if (simpleFontData->canRenderCombiningCharacterSequence(characters, length))
+            return simpleFontData;
+    }
+
+    if (!triedBaseCharacterFontData && baseCharacterGlyphData.fontData && baseCharacterGlyphData.fontData->canRenderCombiningCharacterSequence(characters, length))
+        return baseCharacterGlyphData.fontData;
+
+    return SimpleFontData::systemFallback();
+}
+
+} // namespace blink