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