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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, 2006, 2007, 2011 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 "TextFlags.h"
#include "WritingMode.h"
#include <wtf/RefCounted.h>
#include <wtf/text/StringView.h>
namespace WebCore {
class FloatPoint;
class FloatRect;
class FontCascade;
class GraphicsContext;
class GlyphBuffer;
class GlyphToPathTranslator;
class Font;
struct GlyphData;
struct WidthIterator;
class TextRun {
WTF_MAKE_FAST_ALLOCATED;
public:
explicit TextRun(StringView text, float xpos = 0, float expansion = 0, ExpansionBehavior expansionBehavior = AllowTrailingExpansion | ForbidLeadingExpansion, TextDirection direction = LTR, bool directionalOverride = false, bool characterScanForCodePath = true)
: m_text(text)
, m_charactersLength(text.length())
, m_tabSize(0)
, m_xpos(xpos)
, m_horizontalGlyphStretch(1)
, m_expansion(expansion)
, m_expansionBehavior(expansionBehavior)
, m_allowTabs(false)
, m_direction(direction)
, m_directionalOverride(directionalOverride)
, m_characterScanForCodePath(characterScanForCodePath)
, m_disableSpacing(false)
{
}
TextRun subRun(unsigned startOffset, unsigned length) const
{
ASSERT_WITH_SECURITY_IMPLICATION(startOffset < m_text.length());
TextRun result = *this;
if (is8Bit()) {
result.setText(data8(startOffset), length);
return result;
}
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(); }
unsigned charactersLength() const { return m_charactersLength; }
String string() const { return m_text.toString(); }
void setText(const LChar* c, unsigned len) { m_text = StringView(c, len); }
void setText(const UChar* c, unsigned len) { m_text = StringView(c, len); }
void setText(StringView stringView) { m_text = stringView; }
void setCharactersLength(unsigned charactersLength) { m_charactersLength = charactersLength; }
float horizontalGlyphStretch() const { return m_horizontalGlyphStretch; }
void setHorizontalGlyphStretch(float scale) { m_horizontalGlyphStretch = scale; }
bool allowTabs() const { return m_allowTabs; }
unsigned tabSize() const { return m_tabSize; }
void setTabSize(bool, unsigned);
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 m_direction == RTL; }
bool ltr() const { return m_direction == 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 = direction; }
void setDirectionalOverride(bool override) { m_directionalOverride = override; }
void setCharacterScanForCodePath(bool scan) { m_characterScanForCodePath = scan; }
StringView text() const { return m_text; }
class RenderingContext : public RefCounted<RenderingContext> {
public:
virtual ~RenderingContext() { }
#if ENABLE(SVG_FONTS)
virtual GlyphData glyphDataForCharacter(const FontCascade&, WidthIterator&, UChar32 character, bool mirror, int currentCharacter, unsigned& advanceLength, String& normalizedSpacesStringCache) = 0;
virtual void drawSVGGlyphs(GraphicsContext&, const Font&, const GlyphBuffer&, int from, int to, const FloatPoint&) const = 0;
virtual float floatWidthUsingSVGFont(const FontCascade&, const TextRun&, int& charsConsumed, String& glyphName) const = 0;
virtual bool applySVGKerning(const Font*, WidthIterator&, GlyphBuffer*, int from) const = 0;
virtual std::unique_ptr<GlyphToPathTranslator> createGlyphToPathTranslator(const Font&, const TextRun*, const GlyphBuffer&, int from, int numGlyphs, const FloatPoint&) const = 0;
#endif
};
RenderingContext* renderingContext() const { return m_renderingContext.get(); }
void setRenderingContext(PassRefPtr<RenderingContext> context) { m_renderingContext = context; }
private:
RefPtr<RenderingContext> m_renderingContext;
StringView m_text;
unsigned m_charactersLength; // Marks the end of the characters buffer. Default equals to length of m_text.
unsigned 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, unsigned size)
{
m_allowTabs = allow;
m_tabSize = size;
}
}
#endif
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