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/*
* Copyright (C) 2003, 2006, 2008, 2011 Apple Inc. All rights reserved.
* Copyright (C) 2008 Holger Hans Peter Freyther
*
* 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 WidthIterator_h
#define WidthIterator_h
#include "platform/PlatformExport.h"
#include "platform/fonts/Font.h"
#include "platform/fonts/SVGGlyph.h"
#include "platform/text/TextRun.h"
#include "wtf/HashSet.h"
#include "wtf/unicode/Unicode.h"
#include "wtf/Vector.h"
namespace WebCore {
class Font;
class GlyphBuffer;
class SimpleFontData;
class TextRun;
struct GlyphData;
struct PLATFORM_EXPORT WidthIterator {
WTF_MAKE_FAST_ALLOCATED;
public:
WidthIterator(const Font*, const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, bool accountForGlyphBounds = false, bool forTextEmphasis = false);
unsigned advance(int to, GlyphBuffer*);
bool advanceOneCharacter(float& width, GlyphBuffer&);
float maxGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_maxGlyphBoundingBoxY; }
float minGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_minGlyphBoundingBoxY; }
float firstGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_firstGlyphOverflow; }
float lastGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_lastGlyphOverflow; }
const TextRun& run() const { return m_run; }
float runWidthSoFar() const { return m_runWidthSoFar; }
#if ENABLE(SVG_FONTS)
Vector<SVGGlyph::ArabicForm>& arabicForms() { return m_arabicForms; }
#endif
static bool supportsTypesettingFeatures(const Font& font)
{
return !font.fontDescription().typesettingFeatures();
}
const Font* m_font;
const TextRun& m_run;
unsigned m_currentCharacter;
float m_runWidthSoFar;
float m_expansion;
float m_expansionPerOpportunity;
bool m_isAfterExpansion;
float m_finalRoundingWidth;
#if ENABLE(SVG_FONTS)
Vector<SVGGlyph::ArabicForm> m_arabicForms;
#endif
private:
GlyphData glyphDataForCharacter(UChar32, bool mirror, int currentCharacter, unsigned& advanceLength);
template <typename TextIterator>
inline unsigned advanceInternal(TextIterator&, GlyphBuffer*);
bool shouldApplyFontTransforms() const { return m_run.length() > 1 && (m_typesettingFeatures & (Kerning | Ligatures)); }
TypesettingFeatures m_typesettingFeatures;
HashSet<const SimpleFontData*>* m_fallbackFonts;
bool m_accountForGlyphBounds;
float m_maxGlyphBoundingBoxY;
float m_minGlyphBoundingBoxY;
float m_firstGlyphOverflow;
float m_lastGlyphOverflow;
bool m_forTextEmphasis;
};
}
#endif
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