Revert of Switch to HarfBuzz on Mac and remove CoreText shaper

Source/platform/fonts/mac/FontMac.cpp

+/*
+ * Copyright (c) 2011 Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER OR 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/LayoutTestSupport.h"
+#include "platform/fonts/FontPlatformFeatures.h"
+#include "platform/fonts/FontSmoothingMode.h"
+#include "platform/fonts/GlyphBuffer.h"
+#include "platform/fonts/SimpleFontData.h"
+#include "platform/graphics/GraphicsContext.h"
+
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkPaint.h"
+#include "third_party/skia/include/core/SkTypeface.h"
+
+namespace blink {
+
+bool FontPlatformFeatures::canExpandAroundIdeographsInComplexText()
+{
+    return true;
+}
+
+static void setupPaint(SkPaint* paint, const SimpleFontData* fontData, const Font* font, bool shouldAntialias, bool shouldSmoothFonts)
+{
+    const FontPlatformData& platformData = fontData->platformData();
+    const float textSize = platformData.m_textSize >= 0 ? platformData.m_textSize : 12;
+
+    paint->setAntiAlias(shouldAntialias);
+    paint->setEmbeddedBitmapText(false);
+    paint->setTextSize(SkFloatToScalar(textSize));
+    paint->setVerticalText(platformData.orientation() == Vertical);
+    paint->setTypeface(platformData.typeface());
+    paint->setFakeBoldText(platformData.m_syntheticBold);
+    paint->setTextSkewX(platformData.m_syntheticItalic ? -SK_Scalar1 / 4 : 0);
+    paint->setAutohinted(false); // freetype specific
+    paint->setLCDRenderText(shouldSmoothFonts);
+    paint->setSubpixelText(true);
+
+    // When using CoreGraphics, disable hinting when webkit-font-smoothing:antialiased is used.
+    // See crbug.com/152304
+    if (font->fontDescription().fontSmoothing() == Antialiased || font->fontDescription().textRendering() == GeometricPrecision)
+        paint->setHinting(SkPaint::kNo_Hinting);
+}
+
+// TODO: This needs to be split into helper functions to better scope the
+// inputs/outputs, and reduce duplicate code.
+// This issue is tracked in https://bugs.webkit.org/show_bug.cgi?id=62989
+void Font::drawGlyphs(GraphicsContext* gc, const SimpleFontData* font,
+    const GlyphBuffer& glyphBuffer, unsigned from, unsigned numGlyphs,
+    const FloatPoint& point, const FloatRect& textRect) const
+{
+    bool shouldSmoothFonts = true;
+    bool shouldAntialias = true;
+
+    switch (fontDescription().fontSmoothing()) {
+    case Antialiased:
+        shouldSmoothFonts = false;
+        break;
+    case SubpixelAntialiased:
+        break;
+    case NoSmoothing:
+        shouldAntialias = false;
+        shouldSmoothFonts = false;
+        break;
+    case AutoSmoothing:
+        // For the AutoSmooth case, don't do anything! Keep the default settings.
+        break;
+    }
+
+    if (LayoutTestSupport::isRunningLayoutTest()) {
+        shouldSmoothFonts = false;
+        shouldAntialias = shouldAntialias && LayoutTestSupport::isFontAntialiasingEnabledForTest();
+    }
+
+    const Glyph* glyphs = glyphBuffer.glyphs(from);
+    SkScalar x = SkFloatToScalar(point.x());
+    SkScalar y = SkFloatToScalar(point.y());
+
+    if (font->platformData().orientation() == Vertical)
+        y += SkFloatToScalar(font->fontMetrics().floatAscent(IdeographicBaseline) - font->fontMetrics().floatAscent());
+
+    // FIXME: implement a no-vertical-advances fast path like FontHarfBuzz has.
+
+    // FIXME: text rendering speed:
+    // Android has code in their WebCore fork to special case when the
+    // GlyphBuffer has no advances other than the defaults. In that case the
+    // text drawing can proceed faster. However, it's unclear when those
+    // patches may be upstreamed to WebKit so we always use the slower path
+    // here.
+    const FloatSize* adv = glyphBuffer.advances(from);
+    SkAutoSTMalloc<32, SkPoint> storage(numGlyphs);
+    SkPoint* pos = storage.get();
+
+    for (unsigned i = 0; i < numGlyphs; i++) {
+        pos[i].set(x, y);
+        x += SkFloatToScalar(adv[i].width());
+        y += SkFloatToScalar(adv[i].height());
+    }
+
+    if (font->platformData().orientation() == Vertical) {
+        gc->save();
+        gc->rotate(-0.5 * SK_ScalarPI);
+        SkMatrix rotator;
+        rotator.reset();
+        rotator.setRotate(90);
+        rotator.mapPoints(pos, numGlyphs);
+    }
+    TextDrawingModeFlags textMode = gc->textDrawingMode();
+
+    // We draw text up to two times (once for fill, once for stroke).
+    if (textMode & TextModeFill) {
+        SkPaint paint = gc->fillPaint();
+        setupPaint(&paint, font, this, shouldAntialias, shouldSmoothFonts);
+        gc->adjustTextRenderMode(&paint);
+        paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
+
+        gc->drawPosText(glyphs, numGlyphs * sizeof(Glyph), pos, textRect, paint);
+    }
+
+    if ((textMode & TextModeStroke)
+        && gc->strokeStyle() != NoStroke
+        && gc->strokeThickness() > 0) {
+
+        SkPaint paint = gc->strokePaint();
+        setupPaint(&paint, font, this, shouldAntialias, shouldSmoothFonts);
+        gc->adjustTextRenderMode(&paint);
+        paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
+
+        if (textMode & TextModeFill) {
+            // If we also filled, we don't want to draw shadows twice.
+            // See comment in FontHarfBuzz.cpp::paintGlyphs() for more details.
+            paint.setLooper(0);
+        }
+
+        gc->drawPosText(glyphs, numGlyphs * sizeof(Glyph), pos, textRect, paint);
+    }
+    if (font->platformData().orientation() == Vertical)
+        gc->restore();
+}
+
+void Font::drawTextBlob(GraphicsContext*, const SkTextBlob*, const SkPoint&) const
+{
+    // FIXME: Add text blob support to FontMac.
+}
+
+PassTextBlobPtr Font::buildTextBlob(const GlyphBuffer& glyphBuffer, float initialAdvance,
+    const FloatRect& bounds, float& advance, bool couldUseLCD) const
+{
+    // FIXME: Add text blob support to FontMac.
+    return nullptr;
+}
+
+} // namespace blink