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/*
* Copyright (C) 2021 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 "FontCascade.h"
#include "InlineRect.h"
#include "LayoutBox.h"
#include "LayoutUnits.h"
#include "LengthFunctions.h"
#include "StyleTextEdge.h"
#include <wtf/OptionSet.h>
namespace WebCore {
namespace Layout {
class LineBox;
class LineBoxBuilder;
class LineBoxVerticalAligner;
class InlineLevelBox {
public:
enum class LineSpanningInlineBox : bool { No, Yes };
static inline InlineLevelBox createInlineBox(const Box&, const RenderStyle&, InlineLayoutUnit logicalLeft, InlineLayoutUnit logicalWidth, LineSpanningInlineBox = LineSpanningInlineBox::No);
static inline InlineLevelBox createRootInlineBox(const Box&, const RenderStyle&, InlineLayoutUnit logicalLeft, InlineLayoutUnit logicalWidth);
static inline InlineLevelBox createAtomicInlineBox(const Box&, const RenderStyle&, InlineLayoutUnit logicalLeft, InlineLayoutUnit logicalWidth);
static inline InlineLevelBox createLineBreakBox(const Box&, const RenderStyle&, InlineLayoutUnit logicalLeft);
static inline InlineLevelBox createGenericInlineLevelBox(const Box&, const RenderStyle&, InlineLayoutUnit logicalLeft);
struct AscentAndDescent {
InlineLayoutUnit ascent { 0 };
InlineLayoutUnit descent { 0 };
InlineLayoutUnit height() const { return ascent + descent; }
friend bool operator==(const AscentAndDescent&, const AscentAndDescent&) = default;
// FIXME: Remove this.
// We need floor/ceil to match legacy layout integral positioning.
void round();
};
InlineLayoutUnit ascent() const { return m_ascentAndDescent.ascent; }
InlineLayoutUnit descent() const { return m_ascentAndDescent.descent; }
// See https://www.w3.org/TR/css-inline-3/#layout-bounds
AscentAndDescent layoutBounds() const { return m_layoutBounds; }
bool hasContent() const { return m_hasContent; }
void setHasContent();
struct VerticalAlignment {
VerticalAlign type { VerticalAlign::Baseline };
std::optional<InlineLayoutUnit> baselineOffset;
};
VerticalAlignment verticalAlign() const { return m_style.verticalAlignment; }
bool hasLineBoxRelativeAlignment() const;
InlineLayoutUnit preferredLineHeight() const;
bool isPreferredLineHeightFontMetricsBased() const { return m_style.lineHeight.isNormal(); }
inline bool mayStretchLineBox() const;
const FontMetrics& primarymetricsOfPrimaryFont() const { return m_style.primaryFontMetrics; }
InlineLayoutUnit fontSize() const { return m_style.primaryFontSize; }
TextBoxTrim textBoxTrim() const { return m_style.textBoxTrim; }
TextEdge textBoxEdge() const { return m_style.textBoxEdge; }
TextEdge lineFitEdge() const { return m_style.lineFitEdge; }
InlineLayoutUnit inlineBoxContentOffsetForTextBoxTrim() const { return m_inlineBoxContentOffsetForTextBoxTrim; }
bool hasTextEmphasis() const { return (hasContent() || isAtomicInlineBox()) && m_textEmphasis.has_value(); };
std::optional<InlineLayoutUnit> textEmphasisAbove() const { return hasTextEmphasis() ? std::optional { m_textEmphasis->above } : std::nullopt; }
std::optional<InlineLayoutUnit> textEmphasisBelow() const { return hasTextEmphasis() ? std::optional { m_textEmphasis->below } : std::nullopt; }
bool isInlineBox() const { return m_type == Type::InlineBox || isRootInlineBox() || isLineSpanningInlineBox(); }
bool isRootInlineBox() const { return m_type == Type::RootInlineBox; }
bool isLineSpanningInlineBox() const { return m_type == Type::LineSpanningInlineBox; }
bool isAtomicInlineBox() const { return m_type == Type::AtomicInlineBox; }
bool isListMarker() const { return isAtomicInlineBox() && layoutBox().isListMarkerBox(); }
bool isLineBreakBox() const { return m_type == Type::LineBreakBox; }
enum class Type : uint8_t {
InlineBox = 1 << 0,
LineSpanningInlineBox = 1 << 1,
RootInlineBox = 1 << 2,
AtomicInlineBox = 1 << 3,
LineBreakBox = 1 << 4,
GenericInlineLevelBox = 1 << 5
};
Type type() const { return m_type; }
const Box& layoutBox() const { return m_layoutBox; }
bool isFirstBox() const { return m_isFirstWithinLayoutBox; }
bool isLastBox() const { return m_isLastWithinLayoutBox; }
private:
enum class PositionWithinLayoutBox {
First = 1 << 0,
Last = 1 << 1
};
InlineLevelBox(const Box&, const RenderStyle&, InlineLayoutUnit logicalLeft, InlineLayoutSize, Type, OptionSet<PositionWithinLayoutBox> = { PositionWithinLayoutBox::First, PositionWithinLayoutBox::Last });
friend class InlineDisplayLineBuilder;
friend class LineBox;
friend class LineBoxBuilder;
friend class LineBoxVerticalAligner;
friend class InlineFormattingUtils;
friend class RubyFormattingContext;
const InlineRect& logicalRect() const { return m_logicalRect; }
InlineLayoutUnit logicalTop() const { return m_logicalRect.top(); }
InlineLayoutUnit logicalBottom() const { return m_logicalRect.bottom(); }
InlineLayoutUnit logicalLeft() const { return m_logicalRect.left(); }
InlineLayoutUnit logicalRight() const { return m_logicalRect.right(); }
InlineLayoutUnit logicalWidth() const { return m_logicalRect.width(); }
InlineLayoutUnit logicalHeight() const { return m_logicalRect.height(); }
// FIXME: Remove legacy rounding.
void setLogicalWidth(InlineLayoutUnit logicalWidth) { m_logicalRect.setWidth(logicalWidth); }
void setLogicalHeight(InlineLayoutUnit logicalHeight) { m_logicalRect.setHeight(logicalHeight); }
void setLogicalTop(InlineLayoutUnit logicalTop) { m_logicalRect.setTop(logicalTop); }
void setLogicalLeft(InlineLayoutUnit logicalLeft) { m_logicalRect.setLeft(logicalLeft); }
void setAscentAndDescent(AscentAndDescent ascentAndDescent) { m_ascentAndDescent = ascentAndDescent; }
void setLayoutBounds(const AscentAndDescent& layoutBounds) { m_layoutBounds = layoutBounds; }
void setInlineBoxContentOffsetForTextBoxTrim(InlineLayoutUnit offset) { m_inlineBoxContentOffsetForTextBoxTrim = offset; }
void setIsFirstBox() { m_isFirstWithinLayoutBox = true; }
void setIsLastBox() { m_isLastWithinLayoutBox = true; }
void setTextEmphasis(std::pair<InlineLayoutUnit, InlineLayoutUnit>);
private:
CheckedRef<const Box> m_layoutBox;
// This is the combination of margin and border boxes. Inline level boxes are vertically aligned using their margin boxes.
InlineRect m_logicalRect;
AscentAndDescent m_layoutBounds;
AscentAndDescent m_ascentAndDescent;
InlineLayoutUnit m_inlineBoxContentOffsetForTextBoxTrim { 0.f };
bool m_hasContent { false };
// These bits are about whether this inline level box is the first/last generated box of the associated Layout::Box
// (e.g. always true for atomic inline level boxes, but inline boxes spanning over multiple lines can produce separate first/last boxes).
bool m_isFirstWithinLayoutBox { false };
bool m_isLastWithinLayoutBox { false };
Type m_type { Type::InlineBox };
struct Style {
const FontMetrics& primaryFontMetrics;
const Length& lineHeight;
TextBoxTrim textBoxTrim;
TextEdge textBoxEdge;
TextEdge lineFitEdge;
OptionSet<LineBoxContain> lineBoxContain;
InlineLayoutUnit primaryFontSize { 0 };
VerticalAlignment verticalAlignment { };
};
Style m_style;
struct TextEmphasis {
InlineLayoutUnit above;
InlineLayoutUnit below;
};
std::optional<TextEmphasis> m_textEmphasis;
};
inline void InlineLevelBox::setHasContent()
{
ASSERT(isInlineBox());
m_hasContent = true;
}
inline InlineLayoutUnit InlineLevelBox::preferredLineHeight() const
{
if (isPreferredLineHeightFontMetricsBased())
return primarymetricsOfPrimaryFont().lineSpacing();
if (m_style.lineHeight.isPercentOrCalculated())
return minimumValueForLength(m_style.lineHeight, fontSize());
return m_style.lineHeight.value();
}
inline bool InlineLevelBox::hasLineBoxRelativeAlignment() const
{
auto verticalAlignment = verticalAlign().type;
return verticalAlignment == VerticalAlign::Top || verticalAlignment == VerticalAlign::Bottom;
}
inline void InlineLevelBox::AscentAndDescent::round()
{
ascent = floorf(ascent);
descent = ceilf(descent);
}
}
}
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