Source/WebCore/rendering/LegacyLineLayout.h

/*
 * Copyright (C) 2019 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
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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#pragma once

#include <WebCore/LegacyInlineFlowBox.h>
#include <WebCore/LineWidth.h>
#include <WebCore/RenderLineBoxList.h>
#include <WebCore/RenderStyleConstants.h>
#include <WebCore/TrailingObjects.h>
#include <wtf/TZoneMalloc.h>

namespace WebCore {

class BidiContext;
class FloatingObject;
class FloatWithRect;
class LegacyInlineBox;
class LegacyInlineIterator;
class LineInfo;
class LocalFrameViewLayoutContext;
class RenderBlockFlow;
class RenderObject;
class LegacyRootInlineBox;
struct BidiStatus;
struct WordMeasurement;

template <class Run> class BidiRunList;

class LegacyLineLayout {
    WTF_MAKE_TZONE_ALLOCATED(LegacyLineLayout);
public:
    LegacyLineLayout(RenderBlockFlow&);
    ~LegacyLineLayout();

    LegacyRootInlineBox* legacyRootBox() const { return m_legacyRootInlineBox.get(); }
    void deleteLegacyRootBox(bool runCleanup = false);

    void layoutLineBoxes();
    void shiftLineBy(LayoutUnit shiftX, LayoutUnit shiftY);

    LegacyRootInlineBox* constructLine(BidiRunList<BidiRun>&, const LineInfo&);
    void addOverflowFromInlineChildren();

    size_t lineCount() const;

    static void appendRunsForObject(BidiRunList<BidiRun>*, int start, int end, RenderObject&, InlineBidiResolver&);

    static bool shouldSkipCreatingRunsForObject(RenderObject&);

private:
    std::unique_ptr<LegacyRootInlineBox> createRootInlineBox();
    LegacyRootInlineBox* createAndAppendRootInlineBox();
    LegacyInlineBox* createInlineBoxForRenderer(RenderObject*);
    LegacyInlineFlowBox* createLineBoxes(RenderObject*, const LineInfo&, LegacyInlineBox*);
    void removeInlineBox(BidiRun&, const LegacyRootInlineBox&) const;
    void removeEmptyTextBoxesAndUpdateVisualReordering(LegacyRootInlineBox*, BidiRun* firstRun);
    inline BidiRun* handleTrailingSpaces(BidiRunList<BidiRun>& bidiRuns, BidiContext* currentContext);
    LegacyRootInlineBox* createLineBoxesFromBidiRuns(unsigned bidiLevel, BidiRunList<BidiRun>& bidiRuns, const LegacyInlineIterator& end, LineInfo&);
    void layoutRunsAndFloats(bool hasInlineChild);
    void layoutRunsAndFloatsInRange(InlineBidiResolver&);

    const RenderStyle& style() const;
    const LocalFrameViewLayoutContext& layoutContext() const;

    RenderBlockFlow& m_flow;
    std::unique_ptr<LegacyRootInlineBox> m_legacyRootInlineBox;
};

};