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/*
* Copyright (C) 2010 Alex Milowski (alex@milowski.com). 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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.
*/
#ifndef RenderMathMLOperator_h
#define RenderMathMLOperator_h
#if ENABLE(MATHML)
#include "GlyphPage.h"
#include "MathMLElement.h"
#include "OpenTypeMathData.h"
#include "RenderMathMLToken.h"
#include "SimpleFontData.h"
namespace WebCore {
namespace MathMLOperatorDictionary {
enum Form { Infix, Prefix, Postfix };
enum Flag {
Accent = 0x1, // FIXME: This must be used to implement accentunder/accent on munderover (https://bugs.webkit.org/show_bug.cgi?id=124826).
Fence = 0x2, // This has no visual effect but allows to expose semantic information via the accessibility tree.
LargeOp = 0x4,
MovableLimits = 0x8, // FIXME: This must be used to implement displaystyle (https://bugs.webkit.org/show_bug.cgi?id=118737).
Separator = 0x10, // This has no visual effect but allows to expose semantic information via the accessibility tree.
Stretchy = 0x20,
Symmetric = 0x40
};
struct Entry {
UChar character;
Form form;
unsigned short lspace;
unsigned short rspace;
unsigned short flags;
};
}
class RenderMathMLOperator : public RenderMathMLToken {
public:
RenderMathMLOperator(MathMLElement&, PassRef<RenderStyle>);
RenderMathMLOperator(Document&, PassRef<RenderStyle>, const String& operatorString, MathMLOperatorDictionary::Form, unsigned short flags = 0);
virtual void stretchTo(LayoutUnit heightAboveBaseline, LayoutUnit depthBelowBaseline);
void stretchTo(LayoutUnit width);
LayoutUnit stretchSize() const { return m_isVertical ? m_stretchHeightAboveBaseline + m_stretchDepthBelowBaseline : m_stretchWidth; }
bool hasOperatorFlag(MathMLOperatorDictionary::Flag flag) const { return m_operatorFlags & flag; }
// FIXME: The displaystyle property is not implemented (https://bugs.webkit.org/show_bug.cgi?id=118737).
bool isLargeOperatorInDisplayStyle() const { return !hasOperatorFlag(MathMLOperatorDictionary::Stretchy) && hasOperatorFlag(MathMLOperatorDictionary::LargeOp); }
void updateStyle() override final;
virtual void paint(PaintInfo&, const LayoutPoint&);
void updateTokenContent(const String& operatorString);
void updateTokenContent() override final;
void updateOperatorProperties();
protected:
virtual const char* renderName() const override { return isAnonymous() ? "RenderMathMLOperator (anonymous)" : "RenderMathMLOperator"; }
virtual void paintChildren(PaintInfo& forSelf, const LayoutPoint&, PaintInfo& forChild, bool usePrintRect) override;
virtual bool isRenderMathMLOperator() const override { return true; }
// The following operators are invisible: U+2061 FUNCTION APPLICATION, U+2062 INVISIBLE TIMES, U+2063 INVISIBLE SEPARATOR, U+2064 INVISIBLE PLUS.
bool isInvisibleOperator() const { return 0x2061 <= m_operator && m_operator <= 0x2064; }
virtual bool isChildAllowed(const RenderObject&, const RenderStyle&) const override;
virtual void computePreferredLogicalWidths() override;
virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const override;
virtual int firstLineBaseline() const override;
virtual RenderMathMLOperator* unembellishedOperator() override { return this; }
void rebuildTokenContent(const String& operatorString);
void updateFromElement() override;
bool shouldAllowStretching() const;
FloatRect boundsForGlyph(const GlyphData&) const;
float heightForGlyph(const GlyphData&) const;
float advanceForGlyph(const GlyphData&) const;
enum DrawMode {
DrawNormal, DrawSizeVariant, DrawGlyphAssembly
};
class StretchyData {
public:
DrawMode mode() const { return m_mode; }
GlyphData variant() const { return m_data[0]; }
GlyphData top() const { return m_data[0]; }
GlyphData extension() const { return m_data[1]; }
GlyphData bottom() const { return m_data[2]; }
GlyphData middle() const { return m_data[3]; }
GlyphData left() const { return m_data[2]; }
GlyphData right() const { return m_data[0]; }
void setNormalMode()
{
m_mode = DrawNormal;
}
void setSizeVariantMode(const GlyphData& variant)
{
m_mode = DrawSizeVariant;
m_data[0] = variant;
}
void setGlyphAssemblyMode(const GlyphData& top, const GlyphData& extension, const GlyphData& bottom, const GlyphData& middle)
{
m_mode = DrawGlyphAssembly;
m_data[0] = top;
m_data[1] = extension;
m_data[2] = bottom;
m_data[3] = middle;
}
StretchyData()
: m_mode(DrawNormal) { }
StretchyData(const StretchyData& data)
{
switch (data.m_mode) {
case DrawNormal:
setNormalMode();
break;
case DrawSizeVariant:
setSizeVariantMode(data.variant());
break;
case DrawGlyphAssembly:
setGlyphAssemblyMode(data.top(), data.extension(), data.bottom(), data.middle());
break;
}
}
private:
DrawMode m_mode;
// FIXME: For OpenType fonts with a MATH table all the glyphs are from the same font, so we would only need to store the glyph indices here.
GlyphData m_data[4];
};
bool getGlyphAssemblyFallBack(Vector<OpenTypeMathData::AssemblyPart>, StretchyData&) const;
StretchyData getDisplayStyleLargeOperator(UChar) const;
StretchyData findStretchyData(UChar, float* maximumGlyphWidth);
enum GlyphPaintTrimming {
TrimTop,
TrimBottom,
TrimTopAndBottom,
TrimLeft,
TrimRight,
TrimLeftAndRight
};
LayoutRect paintGlyph(PaintInfo&, const GlyphData&, const LayoutPoint& origin, GlyphPaintTrimming);
void fillWithVerticalExtensionGlyph(PaintInfo&, const LayoutPoint& from, const LayoutPoint& to);
void fillWithHorizontalExtensionGlyph(PaintInfo&, const LayoutPoint& from, const LayoutPoint& to);
void paintVerticalGlyphAssembly(PaintInfo&, const LayoutPoint&);
void paintHorizontalGlyphAssembly(PaintInfo&, const LayoutPoint&);
LayoutUnit m_stretchHeightAboveBaseline;
LayoutUnit m_stretchDepthBelowBaseline;
LayoutUnit m_stretchWidth;
UChar m_operator;
bool m_isVertical;
StretchyData m_stretchyData;
MathMLOperatorDictionary::Form m_operatorForm;
unsigned short m_operatorFlags;
LayoutUnit m_leadingSpace;
LayoutUnit m_trailingSpace;
LayoutUnit m_minSize;
LayoutUnit m_maxSize;
void setOperatorFlagFromAttribute(MathMLOperatorDictionary::Flag, const QualifiedName&);
void setOperatorPropertiesFromOpDictEntry(const MathMLOperatorDictionary::Entry*);
virtual void SetOperatorProperties();
};
RENDER_OBJECT_TYPE_CASTS(RenderMathMLOperator, isRenderMathMLOperator())
}
#endif // ENABLE(MATHML)
#endif // RenderMathMLOperator_h
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