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 "core/platform/graphics/Font.h" 26 #include "core/platform/graphics/SVGGlyph.h" 27 #include "core/platform/graphics/TextRun.h" 28 #include "wtf/HashSet.h" 29 #include "wtf/unicode/Unicode.h" 30 #include "wtf/Vector.h" 31 32 namespace WebCore { 33 34 class Font; 35 class GlyphBuffer; 36 class SimpleFontData; 37 class TextRun; 38 struct GlyphData; 39 40 struct WidthIterator { 41 WTF_MAKE_FAST_ALLOCATED; 42 public: 43 WidthIterator(const Font*, const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, bool accountForGlyphBounds = false, bool forTextEmphasis = false); 44 45 unsigned advance(int to, GlyphBuffer*); 46 bool advanceOneCharacter(float& width, GlyphBuffer&); 47 48 float maxGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_maxGlyphBoundingBoxY; } 49 float minGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_minGlyphBoundingBoxY; } 50 float firstGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_firstGlyphOverflow; } 51 float lastGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_lastGlyphOverflow; } 52 53 const TextRun& run() const { return m_run; } 54 float runWidthSoFar() const { return m_runWidthSoFar; } 55 56 #if ENABLE(SVG_FONTS) 57 String lastGlyphName() const { return m_lastGlyphName; } 58 void setLastGlyphName(const String& name) { m_lastGlyphName = name; } 59 Vector<SVGGlyph::ArabicForm>& arabicForms() { return m_arabicForms; } 60 #endif 61 62 static bool supportsTypesettingFeatures(const Font& font) 63 { 64 65 return !font.typesettingFeatures(); 66 } 67 68 const Font* m_font; 69 70 const TextRun& m_run; 71 72 unsigned m_currentCharacter; 73 float m_runWidthSoFar; 74 float m_expansion; 75 float m_expansionPerOpportunity; 76 bool m_isAfterExpansion; 77 float m_finalRoundingWidth; 78 79 #if ENABLE(SVG_FONTS) 80 String m_lastGlyphName; 81 Vector<SVGGlyph::ArabicForm> m_arabicForms; 82 #endif 83 84 private: 85 GlyphData glyphDataForCharacter(UChar32, bool mirror, int currentCharacter, unsigned& advanceLength); 86 template <typename TextIterator> 87 inline unsigned advanceInternal(TextIterator&, GlyphBuffer*); 88 89 bool shouldApplyFontTransforms() const { return m_run.length() > 1 && (m_typesettingFeatures & (Kerning | Ligatures)); } 90 91 TypesettingFeatures m_typesettingFeatures; 92 HashSet<const SimpleFontData*>* m_fallbackFonts; 93 bool m_accountForGlyphBounds; 94 float m_maxGlyphBoundingBoxY; 95 float m_minGlyphBoundingBoxY; 96 float m_firstGlyphOverflow; 97 float m_lastGlyphOverflow; 98 bool m_forTextEmphasis; 99 }; 100 101 } 102 103 #endif 104
