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 <wtf/HashSet.h> 26 #include <wtf/unicode/Unicode.h> 27 28 namespace WebCore { 29 30 class Font; 31 class GlyphBuffer; 32 class SimpleFontData; 33 class TextRun; 34 35 struct WidthIterator { 36 WidthIterator(const Font*, const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, bool accountForGlyphBounds = false, bool forTextEmphasis = false); 37 38 void advance(int to, GlyphBuffer* = 0); 39 bool advanceOneCharacter(float& width, GlyphBuffer* = 0); 40 41 float maxGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_maxGlyphBoundingBoxY; } 42 float minGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_minGlyphBoundingBoxY; } 43 float firstGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_firstGlyphOverflow; } 44 float lastGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_lastGlyphOverflow; } 45 46 const Font* m_font; 47 48 const TextRun& m_run; 49 int m_end; 50 51 unsigned m_currentCharacter; 52 float m_runWidthSoFar; 53 float m_expansion; 54 float m_expansionPerOpportunity; 55 bool m_isAfterExpansion; 56 57 private: 58 UChar32 normalizeVoicingMarks(int currentCharacter); 59 60 HashSet<const SimpleFontData*>* m_fallbackFonts; 61 bool m_accountForGlyphBounds; 62 float m_maxGlyphBoundingBoxY; 63 float m_minGlyphBoundingBoxY; 64 float m_firstGlyphOverflow; 65 float m_lastGlyphOverflow; 66 bool m_forTextEmphasis; 67 }; 68 69 } 70 71 #endif 72
