Switch to HarfBuzz on Mac and remove CoreText shaper

Source/platform/fonts/mac/FontComplexTextMac.cpp

-/*
- * 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