2 * Copyright (C) 2003, 2006, 2008, 2011 Apple Inc. All rights reserved.
3 * Copyright (C) 2008 Holger Hans Peter Freyther
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.
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.
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.
22 #ifndef WidthIterator_h
23 #define WidthIterator_h
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"
41 struct PLATFORM_EXPORT WidthIterator {
42 WTF_MAKE_FAST_ALLOCATED;
44 WidthIterator(const Font*, const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, bool accountForGlyphBounds = false, bool forTextEmphasis = false);
46 unsigned advance(int to, GlyphBuffer*);
47 bool advanceOneCharacter(float& width, GlyphBuffer&);
49 float maxGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_maxGlyphBoundingBoxY; }
50 float minGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_minGlyphBoundingBoxY; }
51 float firstGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_firstGlyphOverflow; }
52 float lastGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_lastGlyphOverflow; }
54 const TextRun& run() const { return m_run; }
55 float runWidthSoFar() const { return m_runWidthSoFar; }
58 String lastGlyphName() const { return m_lastGlyphName; }
59 void setLastGlyphName(const String& name) { m_lastGlyphName = name; }
60 Vector<SVGGlyph::ArabicForm>& arabicForms() { return m_arabicForms; }
63 static bool supportsTypesettingFeatures(const Font& font)
66 return !font.typesettingFeatures();
73 unsigned m_currentCharacter;
74 float m_runWidthSoFar;
76 float m_expansionPerOpportunity;
77 bool m_isAfterExpansion;
78 float m_finalRoundingWidth;
81 String m_lastGlyphName;
82 Vector<SVGGlyph::ArabicForm> m_arabicForms;
86 GlyphData glyphDataForCharacter(UChar32, bool mirror, int currentCharacter, unsigned& advanceLength);
87 template <typename TextIterator>
88 inline unsigned advanceInternal(TextIterator&, GlyphBuffer*);
90 bool shouldApplyFontTransforms() const { return m_run.length() > 1 && (m_typesettingFeatures & (Kerning | Ligatures)); }
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;