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 "platform/PlatformExport.h" 26 #include "platform/fonts/Font.h" 27 #include "platform/fonts/SVGGlyph.h" 28 #include "platform/text/TextRun.h" 29 #include "wtf/HashSet.h" 30 #include "wtf/unicode/Unicode.h" 31 #include "wtf/Vector.h" 32 33 namespace WebCore { 34 35 class Font; 36 class GlyphBuffer; 37 class SimpleFontData; 38 class TextRun; 39 struct GlyphData; 40 41 struct PLATFORM_EXPORT WidthIterator { 42 WTF_MAKE_FAST_ALLOCATED; 43 public: 44 WidthIterator(const Font*, const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, bool accountForGlyphBounds = false, bool forTextEmphasis = false); 45 46 unsigned advance(int to, GlyphBuffer*); 47 bool advanceOneCharacter(float& width, GlyphBuffer&); 48 maxGlyphBoundingBoxYWidthIterator49 float maxGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_maxGlyphBoundingBoxY; } minGlyphBoundingBoxYWidthIterator50 float minGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_minGlyphBoundingBoxY; } firstGlyphOverflowWidthIterator51 float firstGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_firstGlyphOverflow; } lastGlyphOverflowWidthIterator52 float lastGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_lastGlyphOverflow; } 53 runWidthIterator54 const TextRun& run() const { return m_run; } runWidthSoFarWidthIterator55 float runWidthSoFar() const { return m_runWidthSoFar; } 56 57 #if ENABLE(SVG_FONTS) lastGlyphNameWidthIterator58 String lastGlyphName() const { return m_lastGlyphName; } setLastGlyphNameWidthIterator59 void setLastGlyphName(const String& name) { m_lastGlyphName = name; } arabicFormsWidthIterator60 Vector<SVGGlyph::ArabicForm>& arabicForms() { return m_arabicForms; } 61 #endif 62 supportsTypesettingFeaturesWidthIterator63 static bool supportsTypesettingFeatures(const Font& font) 64 { 65 66 return !font.typesettingFeatures(); 67 } 68 69 const Font* m_font; 70 71 const TextRun& m_run; 72 73 unsigned m_currentCharacter; 74 float m_runWidthSoFar; 75 float m_expansion; 76 float m_expansionPerOpportunity; 77 bool m_isAfterExpansion; 78 float m_finalRoundingWidth; 79 80 #if ENABLE(SVG_FONTS) 81 String m_lastGlyphName; 82 Vector<SVGGlyph::ArabicForm> m_arabicForms; 83 #endif 84 85 private: 86 GlyphData glyphDataForCharacter(UChar32, bool mirror, int currentCharacter, unsigned& advanceLength); 87 template <typename TextIterator> 88 inline unsigned advanceInternal(TextIterator&, GlyphBuffer*); 89 shouldApplyFontTransformsWidthIterator90 bool shouldApplyFontTransforms() const { return m_run.length() > 1 && (m_typesettingFeatures & (Kerning | Ligatures)); } 91 92 TypesettingFeatures m_typesettingFeatures; 93 HashSet<const SimpleFontData*>* m_fallbackFonts; 94 bool m_accountForGlyphBounds; 95 float m_maxGlyphBoundingBoxY; 96 float m_minGlyphBoundingBoxY; 97 float m_firstGlyphOverflow; 98 float m_lastGlyphOverflow; 99 bool m_forTextEmphasis; 100 }; 101 102 } 103 104 #endif 105