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/*
* 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
* 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.
*/
#pragma once
#include "AbstractLineBuilder.h"
#include "FloatingContext.h"
namespace WebCore {
namespace Layout {
struct LineContent;
struct LineCandidate;
class LineBuilder final : public AbstractLineBuilder {
WTF_DEPRECATED_MAKE_FAST_ALLOCATED(LineBuilder);
public:
LineBuilder(InlineFormattingContext&, HorizontalConstraints rootHorizontalConstraints, const InlineItemList&, TextSpacingContext = { });
virtual ~LineBuilder() { };
LineLayoutResult layoutInlineContent(const LineInput&, const std::optional<PreviousLine>&, bool isFirstFormattedLineCandidate) final;
private:
enum class SkipFloats : bool { No, Yes };
void candidateContentForLine(LineCandidate&, std::pair<size_t, size_t> startEndIndex, const InlineItemRange& needsLayoutRange, InlineLayoutUnit currentLogicalRight, SkipFloats = SkipFloats::No);
void applyShapingIfNeeded(LineCandidate&);
Vector<std::pair<size_t, size_t>> collectShapeRanges(const LineCandidate&) const;
void applyShapingOnRunRange(LineCandidate&, std::pair<size_t, size_t> range) const;
void shapePartialLineCandidate(LineCandidate&, size_t trailingRunIndex) const;
InlineLayoutUnit leadingPunctuationWidthForLineCandiate(const LineCandidate&) const;
InlineLayoutUnit trailingPunctuationOrStopOrCommaWidthForLineCandiate(const LineCandidate&, size_t startIndexAfterCandidateContent, size_t layoutRangeEnd) const;
struct Result {
InlineContentBreaker::IsEndOfLine isEndOfLine { InlineContentBreaker::IsEndOfLine::No };
struct CommittedContentCount {
size_t value { 0 };
bool isRevert { false };
};
CommittedContentCount committedCount { };
size_t partialTrailingContentLength { 0 };
std::optional<InlineLayoutUnit> overflowLogicalWidth { };
};
enum MayOverConstrainLine : uint8_t { No, Yes, OnlyWhenFirstFloatOnLine };
bool tryPlacingFloatBox(const Box&, MayOverConstrainLine);
Result handleInlineContent(const InlineItemRange& needsLayoutRange, LineCandidate&);
Result processLineBreakingResult(LineCandidate&, const InlineItemRange& layoutRange, const InlineContentBreaker::Result&);
struct RectAndFloatConstraints {
InlineRect logicalRect;
OptionSet<UsedFloat> constrainedSideSet { };
};
RectAndFloatConstraints floatAvoidingRect(const InlineRect& lineLogicalRect, InlineLayoutUnit lineMarginStart) const;
RectAndFloatConstraints adjustedLineRectWithCandidateInlineContent(const LineCandidate&) const;
void commitCandidateContent(LineCandidate&, std::optional<InlineContentBreaker::Result::PartialTrailingContent>);
size_t rebuildLineWithInlineContent(const InlineItemRange& needsLayoutRange, const InlineItem& lastInlineItemToAdd);
size_t rebuildLineForTrailingSoftHyphen(const InlineItemRange& layoutRange);
void initialize(const InlineRect& initialLineLogicalRect, const InlineItemRange& needsLayoutRange, const std::optional<PreviousLine>&, bool isFirstFormattedLineCandidate);
UniqueRef<LineContent> placeInlineAndFloatContent(const InlineItemRange&);
struct InitialLetterOffsets {
LayoutUnit capHeightOffset;
LayoutUnit sunkenBelowFirstLineOffset;
};
std::optional<InitialLetterOffsets> adjustLineRectForInitialLetterIfApplicable(const Box& floatBox);
bool isLastLineWithInlineContent(const LineContent&, size_t needsLayoutEnd, const Line::RunList&) const;
InlineContentBreaker::Result handleInlineContentWithClonedDecoration(const LineCandidate&, InlineContentBreaker::LineStatus);
InlineLayoutUnit clonedDecorationAtBreakingPosition(const InlineContentBreaker::ContinuousContent::RunList&, const InlineContentBreaker::Result::PartialTrailingContent&) const;
InlineLayoutUnit placedClonedDecorationWidth(const InlineContentBreaker::ContinuousContent::RunList&) const;
bool isFloatLayoutSuspended() const { return !m_suspendedFloats.isEmpty(); }
bool shouldTryToPlaceFloatBox(const Box& floatBox, LayoutUnit floatBoxMarginBoxWidth, MayOverConstrainLine) const;
bool isLineConstrainedByFloat() const { return !m_lineIsConstrainedByFloat.isEmpty(); }
const FloatingContext& floatingContext() const { return m_floatingContext; }
private:
const FloatingContext& m_floatingContext;
InlineRect m_lineInitialLogicalRect;
InlineLayoutUnit m_lineMarginStart { 0.f };
InlineLayoutUnit m_initialIntrusiveFloatsWidth { 0.f };
InlineLayoutUnit m_candidateContentMaximumHeight { 0.f };
LineLayoutResult::PlacedFloatList m_placedFloats;
LineLayoutResult::SuspendedFloatList m_suspendedFloats;
std::optional<InlineLayoutUnit> m_overflowingLogicalWidth;
Vector<InlineItem, 1> m_lineSpanningInlineBoxes;
OptionSet<UsedFloat> m_lineIsConstrainedByFloat { };
std::optional<InlineLayoutUnit> m_initialLetterClearGap;
TextSpacingContext m_textSpacingContext { };
};
}
}
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