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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 "FloatingContext.h"
#include "FormattingConstraints.h"
#include "InlineContentBreaker.h"
#include "InlineFormattingState.h"
#include "InlineLayoutState.h"
#include "InlineLine.h"
#include "InlineLineTypes.h"
namespace WebCore {
namespace Layout {
struct LineContent;
struct LineCandidate;
class LineBuilder {
public:
LineBuilder(const InlineFormattingContext&, const InlineLayoutState&, FloatingState&, HorizontalConstraints rootHorizontalConstraints, const InlineItems&, std::optional<IntrinsicWidthMode> = std::nullopt);
struct LineInput {
InlineItemRange needsLayoutRange;
InlineRect initialLogicalRect;
};
using PlacedFloatList = FloatingState::FloatList;
using SuspendedFloatList = Vector<const Box*>;
struct LayoutResult {
InlineItemRange inlineItemRange;
const Line::RunList& inlineContent;
struct FloatContent {
PlacedFloatList placedFloats;
SuspendedFloatList suspendedFloats;
bool hasIntrusiveFloat { false };
};
FloatContent floatContent { };
struct ContentGeometry {
InlineLayoutUnit logicalLeft { 0.f };
InlineLayoutUnit logicalWidth { 0.f };
InlineLayoutUnit logicalRightIncludingNegativeMargin { 0.f }; // Note that with negative horizontal margin value, contentLogicalLeft + contentLogicalWidth is not necessarily contentLogicalRight.
std::optional<InlineLayoutUnit> trailingOverflowingContentWidth { };
};
ContentGeometry contentGeometry { };
struct LineGeometry {
InlineLayoutPoint logicalTopLeft;
InlineLayoutUnit logicalWidth { 0.f };
InlineLayoutUnit initialLogicalLeftIncludingIntrusiveFloats { 0.f };
std::optional<InlineLayoutUnit> initialLetterClearGap;
};
LineGeometry lineGeometry { };
struct HangingContent {
bool shouldContributeToScrollableOverflow { false };
InlineLayoutUnit logicalWidth { 0.f };
};
HangingContent hangingContent { };
struct Directionality {
Vector<int32_t> visualOrderList;
TextDirection inlineBaseDirection { TextDirection::LTR };
};
Directionality directionality { };
struct IsFirstLast {
enum class FirstFormattedLine : uint8_t {
No,
WithinIFC,
WithinBFC
};
FirstFormattedLine isFirstFormattedLine { FirstFormattedLine::WithinIFC };
bool isLastLineWithInlineContent { true };
};
IsFirstLast isFirstLast { };
// Misc
size_t nonSpanningInlineLevelBoxCount { 0 };
std::optional<InlineLayoutUnit> hintForNextLineTopToAvoidIntrusiveFloat { }; // This is only used for cases when intrusive floats prevent any content placement at current vertical position.
};
LayoutResult layoutInlineContent(const LineInput&, const std::optional<PreviousLine>&);
private:
void candidateContentForLine(LineCandidate&, size_t inlineItemIndex, const InlineItemRange& needsLayoutRange, InlineLayoutUnit currentLogicalRight);
InlineLayoutUnit leadingPunctuationWidthForLineCandiate(size_t firstInlineTextItemIndex, size_t candidateContentStartIndex) const;
InlineLayoutUnit trailingPunctuationOrStopOrCommaWidthForLineCandiate(size_t lastInlineTextItemIndex, size_t layoutRangeEnd) const;
size_t nextWrapOpportunity(size_t startIndex, const InlineItemRange& layoutRange) const;
struct UsedConstraints {
InlineRect logicalRect;
InlineLayoutUnit marginStart { 0 };
bool isConstrainedByFloat { false };
};
UsedConstraints initialConstraintsForLine(const InlineRect& initialLineLogicalRect, std::optional<bool> previousLineEndsWithLineBreak) const;
FloatingContext::Constraints floatConstraints(const InlineRect& lineLogicalRect) 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 : bool { No, Yes };
bool tryPlacingFloatBox(const Box&, MayOverConstrainLine);
Result handleInlineContent(InlineContentBreaker&, const InlineItemRange& needsLayoutRange, const LineCandidate&);
std::tuple<InlineRect, bool> adjustedLineRectWithCandidateInlineContent(const LineCandidate&) const;
size_t rebuildLineWithInlineContent(const InlineItemRange& needsLayoutRange, const InlineItem& lastInlineItemToAdd);
size_t rebuildLineForTrailingSoftHyphen(const InlineItemRange& layoutRange);
void commitPartialContent(const InlineContentBreaker::ContinuousContent::RunList&, const InlineContentBreaker::Result::PartialTrailingContent&);
void initialize(const InlineRect& initialLineLogicalRect, const UsedConstraints&, const InlineItemRange& needsLayoutRange, const std::optional<PreviousLine>&);
LineContent placeInlineAndFloatContent(const InlineItemRange&);
struct InitialLetterOffsets {
LayoutUnit capHeightOffset;
LayoutUnit sunkenBelowFirstLineOffset;
};
std::optional<InitialLetterOffsets> adjustLineRectForInitialLetterIfApplicable(const Box& floatBox);
InlineLayoutUnit inlineItemWidth(const InlineItem&, InlineLayoutUnit contentLogicalLeft) const;
bool isLastLineWithInlineContent(const InlineItemRange& lineRange, size_t lastInlineItemIndex, bool hasPartialTrailingContent) const;
std::optional<IntrinsicWidthMode> intrinsicWidthMode() const { return m_intrinsicWidthMode; }
bool isInIntrinsicWidthMode() const { return !!intrinsicWidthMode(); }
TextDirection inlineBaseDirectionForLineContent() const;
InlineLayoutUnit horizontalAlignmentOffset(bool isLastLine) const;
bool isFloatLayoutSuspended() const { return !m_suspendedFloats.isEmpty(); }
bool shouldTryToPlaceFloatBox(const Box& floatBox, LayoutUnit floatBoxMarginBoxWidth, MayOverConstrainLine) const;
bool isFirstFormattedLine() const { return !m_previousLine.has_value(); }
const InlineFormattingContext& formattingContext() const { return m_inlineFormattingContext; }
const BlockLayoutState& blockLayoutState() const { return m_inlineLayoutState.parentBlockLayoutState(); }
FloatingState& floatingState() { return m_floatingState; }
const FloatingState& floatingState() const { return const_cast<LineBuilder&>(*this).floatingState(); }
const ElementBox& root() const;
const RenderStyle& rootStyle() const;
private:
std::optional<PreviousLine> m_previousLine { };
std::optional<IntrinsicWidthMode> m_intrinsicWidthMode;
const InlineFormattingContext& m_inlineFormattingContext;
const InlineLayoutState& m_inlineLayoutState;
FloatingState& m_floatingState;
std::optional<HorizontalConstraints> m_rootHorizontalConstraints;
Line m_line;
InlineRect m_lineInitialLogicalRect;
InlineRect m_lineLogicalRect;
InlineLayoutUnit m_lineMarginStart { 0.f };
InlineLayoutUnit m_initialIntrusiveFloatsWidth { 0.f };
InlineLayoutUnit m_candidateInlineContentEnclosingHeight { 0.f };
const InlineItems& m_inlineItems;
PlacedFloatList m_placedFloats;
SuspendedFloatList m_suspendedFloats;
std::optional<InlineTextItem> m_partialLeadingTextItem;
std::optional<InlineLayoutUnit> m_overflowingLogicalWidth;
Vector<const InlineItem*> m_wrapOpportunityList;
Vector<InlineItem> m_lineSpanningInlineBoxes;
unsigned m_successiveHyphenatedLineCount { 0 };
bool m_lineIsConstrainedByFloat { false };
std::optional<InlineLayoutUnit> m_initialLetterClearGap;
};
}
}
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