1/* 2 * Copyright (C) 2003, 2006, 2008, 2011 Apple Inc. All rights reserved. 3 * Copyright (C) 2008 Holger Hans Peter Freyther 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Library General Public 7 * License as published by the Free Software Foundation; either 8 * version 2 of the License, or (at your option) any later version. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Library General Public License for more details. 14 * 15 * You should have received a copy of the GNU Library General Public License 16 * along with this library; see the file COPYING.LIB. If not, write to 17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 18 * Boston, MA 02110-1301, USA. 19 * 20 */ 21 22#ifndef WidthIterator_h 23#define WidthIterator_h 24 25#include "Font.h" 26#include "SVGGlyph.h" 27#include "TextRun.h" 28#include <wtf/HashSet.h> 29#include <wtf/Vector.h> 30 31namespace WebCore { 32 33class Font; 34class GlyphBuffer; 35class SimpleFontData; 36class TextRun; 37struct GlyphData; 38 39struct WidthIterator { 40 WTF_MAKE_FAST_ALLOCATED; 41public: 42 WidthIterator(const Font*, const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, bool accountForGlyphBounds = false, bool forTextEmphasis = false); 43 44 unsigned advance(int to, GlyphBuffer*); 45 bool advanceOneCharacter(float& width, GlyphBuffer&); 46 47 float maxGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_maxGlyphBoundingBoxY; } 48 float minGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_minGlyphBoundingBoxY; } 49 float firstGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_firstGlyphOverflow; } 50 float lastGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_lastGlyphOverflow; } 51 52 const TextRun& run() const { return m_run; } 53 float runWidthSoFar() const { return m_runWidthSoFar; } 54 55#if ENABLE(SVG_FONTS) 56 String lastGlyphName() const { return m_lastGlyphName; } 57 void setLastGlyphName(const String& name) { m_lastGlyphName = name; } 58 Vector<SVGGlyph::ArabicForm>& arabicForms() { return m_arabicForms; } 59#endif 60 61 static bool supportsTypesettingFeatures(const Font& font) 62 { 63#if PLATFORM(IOS) || (PLATFORM(MAC) && __MAC_OS_X_VERSION_MIN_REQUIRED > 1080) 64 if (!font.isPrinterFont()) 65 return !font.typesettingFeatures(); 66 67 return !(font.typesettingFeatures() & ~(Kerning | Ligatures)); 68#else 69 return !font.typesettingFeatures(); 70#endif 71 } 72 73 const Font* m_font; 74 75 const TextRun& m_run; 76 77 unsigned m_currentCharacter; 78 float m_runWidthSoFar; 79 float m_expansion; 80 float m_expansionPerOpportunity; 81 bool m_isAfterExpansion; 82 float m_finalRoundingWidth; 83 84#if ENABLE(SVG_FONTS) 85 String m_lastGlyphName; 86 Vector<SVGGlyph::ArabicForm> m_arabicForms; 87#endif 88 89private: 90 GlyphData glyphDataForCharacter(UChar32, bool mirror, int currentCharacter, unsigned& advanceLength); 91 template <typename TextIterator> 92 inline unsigned advanceInternal(TextIterator&, GlyphBuffer*); 93 94 bool shouldApplyFontTransforms() const { return m_run.length() > 1 && (m_typesettingFeatures & (Kerning | Ligatures)); } 95 96 TypesettingFeatures m_typesettingFeatures; 97 HashSet<const SimpleFontData*>* m_fallbackFonts; 98 bool m_accountForGlyphBounds; 99 float m_maxGlyphBoundingBoxY; 100 float m_minGlyphBoundingBoxY; 101 float m_firstGlyphOverflow; 102 float m_lastGlyphOverflow; 103 bool m_forTextEmphasis; 104}; 105 106} 107 108#endif 109