1/*
2 * Copyright (C) 2018 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
29
30#include "InlineRunProvider.h"
31#include <wtf/IsoMalloc.h>
32
33namespace WebCore {
34namespace Layout {
35
36class InlineLineBreaker {
37 WTF_MAKE_ISO_ALLOCATED(InlineLineBreaker);
38public:
39 InlineLineBreaker(const LayoutState&, const InlineContent&, const Vector<InlineRunProvider::Run>&);
40
41 struct Run {
42 enum class Position { Undetermined, LineBegin, LineEnd };
43 Position position;
44 LayoutUnit width;
45 InlineRunProvider::Run content;
46 };
47 Optional<Run> nextRun(LayoutUnit contentLogicalLeft, LayoutUnit availableWidth, bool lineIsEmpty);
48
49private:
50 enum class LineBreakingBehavior { Keep, Break, WrapToNextLine };
51 LineBreakingBehavior lineBreakingBehavior(const InlineRunProvider::Run&, bool lineIsEmpty);
52 bool isAtContentEnd() const;
53 Run splitRun(const InlineRunProvider::Run&, LayoutUnit contentLogicalLeft, LayoutUnit availableWidth, bool lineIsEmpty);
54 LayoutUnit runWidth(const InlineRunProvider::Run&, LayoutUnit contentLogicalLeft) const;
55 LayoutUnit textWidth(const InlineRunProvider::Run&, LayoutUnit contentLogicalLeft) const;
56 Optional<ItemPosition> adjustSplitPositionWithHyphenation(const InlineRunProvider::Run&, ItemPosition splitPosition, LayoutUnit contentLogicalLeft, LayoutUnit availableWidth, bool isLineEmpty) const;
57
58 const LayoutState& m_layoutState;
59 const InlineContent& m_inlineContent;
60 const Vector<InlineRunProvider::Run>& m_inlineRuns;
61
62 unsigned m_currentRunIndex { 0 };
63 Optional<ItemPosition> m_splitPosition;
64 bool m_hyphenationIsDisabled { false };
65};
66
67}
68}
69#endif
70