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/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* (C) 2000 Antti Koivisto (koivisto@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2003-2018 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef TextRun_h
#define TextRun_h
#include "TabSize.h"
#include "TextFlags.h"
#include "WritingMode.h"
#include <wtf/text/StringView.h>
namespace WebCore {
class FloatPoint;
class FloatRect;
class FontCascade;
class GraphicsContext;
class GlyphBuffer;
class Font;
struct GlyphData;
class TextRun {
WTF_MAKE_FAST_ALLOCATED;
public:
explicit TextRun(const String& text, float xpos = 0, float expansion = 0, ExpansionBehavior expansionBehavior = DefaultExpansion, TextDirection direction = TextDirection::LTR, bool directionalOverride = false, bool characterScanForCodePath = true)
: m_text(text)
, m_tabSize(0)
, m_xpos(xpos)
, m_horizontalGlyphStretch(1)
, m_expansion(expansion)
, m_expansionBehavior(expansionBehavior)
, m_allowTabs(false)
, m_direction(static_cast<unsigned>(direction))
, m_directionalOverride(directionalOverride)
, m_characterScanForCodePath(characterScanForCodePath)
, m_disableSpacing(false)
{
ASSERT(!m_text.isNull());
}
explicit TextRun(StringView stringView, float xpos = 0, float expansion = 0, ExpansionBehavior expansionBehavior = DefaultExpansion, TextDirection direction = TextDirection::LTR, bool directionalOverride = false, bool characterScanForCodePath = true)
: TextRun(stringView.toStringWithoutCopying(), xpos, expansion, expansionBehavior, direction, directionalOverride, characterScanForCodePath)
{
}
TextRun subRun(unsigned startOffset, unsigned length) const
{
ASSERT_WITH_SECURITY_IMPLICATION((startOffset + length) <= m_text.length());
auto result { *this };
if (is8Bit())
result.setText(data8(startOffset), length);
else
result.setText(data16(startOffset), length);
return result;
}
UChar operator[](unsigned i) const { ASSERT_WITH_SECURITY_IMPLICATION(i < m_text.length()); return m_text[i]; }
const LChar* data8(unsigned i) const { ASSERT_WITH_SECURITY_IMPLICATION(i < m_text.length()); ASSERT(is8Bit()); return &m_text.characters8()[i]; }
const UChar* data16(unsigned i) const { ASSERT_WITH_SECURITY_IMPLICATION(i < m_text.length()); ASSERT(!is8Bit()); return &m_text.characters16()[i]; }
const LChar* characters8() const { ASSERT(is8Bit()); return m_text.characters8(); }
const UChar* characters16() const { ASSERT(!is8Bit()); return m_text.characters16(); }
bool is8Bit() const { return m_text.is8Bit(); }
unsigned length() const { return m_text.length(); }
void setText(const LChar* text, unsigned length) { setText({ text, length }); }
void setText(const UChar* text, unsigned length) { setText({ text, length }); }
void setText(StringView text) { ASSERT(!text.isNull()); m_text = text.toStringWithoutCopying(); }
float horizontalGlyphStretch() const { return m_horizontalGlyphStretch; }
void setHorizontalGlyphStretch(float scale) { m_horizontalGlyphStretch = scale; }
bool allowTabs() const { return m_allowTabs; }
const TabSize& tabSize() const { return m_tabSize; }
void setTabSize(bool, const TabSize&);
float xPos() const { return m_xpos; }
void setXPos(float xPos) { m_xpos = xPos; }
float expansion() const { return m_expansion; }
ExpansionBehavior expansionBehavior() const { return m_expansionBehavior; }
TextDirection direction() const { return static_cast<TextDirection>(m_direction); }
bool rtl() const { return static_cast<TextDirection>(m_direction) == TextDirection::RTL; }
bool ltr() const { return static_cast<TextDirection>(m_direction) == TextDirection::LTR; }
bool directionalOverride() const { return m_directionalOverride; }
bool characterScanForCodePath() const { return m_characterScanForCodePath; }
bool spacingDisabled() const { return m_disableSpacing; }
void disableSpacing() { m_disableSpacing = true; }
void setDirection(TextDirection direction) { m_direction = static_cast<unsigned>(direction); }
void setDirectionalOverride(bool override) { m_directionalOverride = override; }
void setCharacterScanForCodePath(bool scan) { m_characterScanForCodePath = scan; }
StringView text() const { return m_text; }
private:
String m_text;
TabSize m_tabSize;
// m_xpos is the x position relative to the left start of the text line, not relative to the left
// start of the containing block. In the case of right alignment or center alignment, left start of
// the text line is not the same as left start of the containing block. This variable is only used
// to calculate the width of \t
float m_xpos;
float m_horizontalGlyphStretch;
float m_expansion;
unsigned m_expansionBehavior : 4;
unsigned m_allowTabs : 1;
unsigned m_direction : 1;
unsigned m_directionalOverride : 1; // Was this direction set by an override character.
unsigned m_characterScanForCodePath : 1;
unsigned m_disableSpacing : 1;
};
inline void TextRun::setTabSize(bool allow, const TabSize& size)
{
m_allowTabs = allow;
m_tabSize = size;
}
}
#endif
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