| /* |
| * Copyright (C) 2003, 2006, 2008, 2011 Apple Inc. All rights reserved. |
| * Copyright (C) 2008 Holger Hans Peter Freyther |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #ifndef WidthIterator_h |
| #define WidthIterator_h |
| |
| #include <unicode/umachine.h> |
| #include <wtf/HashSet.h> |
| #include <wtf/Vector.h> |
| |
| namespace WebCore { |
| |
| class FontCascade; |
| class GlyphBuffer; |
| class Font; |
| class TextRun; |
| struct GlyphData; |
| struct OriginalAdvancesForCharacterTreatedAsSpace; |
| |
| typedef Vector<std::pair<int, OriginalAdvancesForCharacterTreatedAsSpace>, 64> CharactersTreatedAsSpace; |
| |
| struct WidthIterator { |
| WTF_MAKE_FAST_ALLOCATED; |
| public: |
| WidthIterator(const FontCascade*, const TextRun&, HashSet<const Font*>* fallbackFonts = 0, bool accountForGlyphBounds = false, bool forTextEmphasis = false); |
| |
| unsigned advance(unsigned to, GlyphBuffer*); |
| bool advanceOneCharacter(float& width, GlyphBuffer&); |
| |
| float maxGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_maxGlyphBoundingBoxY; } |
| float minGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_minGlyphBoundingBoxY; } |
| float firstGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_firstGlyphOverflow; } |
| float lastGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_lastGlyphOverflow; } |
| |
| const TextRun& run() const { return m_run; } |
| float runWidthSoFar() const { return m_runWidthSoFar; } |
| |
| const FontCascade* m_font; |
| |
| const TextRun& m_run; |
| |
| unsigned m_currentCharacter; |
| float m_runWidthSoFar; |
| float m_expansion; |
| float m_expansionPerOpportunity; |
| bool m_isAfterExpansion; |
| float m_finalRoundingWidth; |
| |
| private: |
| GlyphData glyphDataForCharacter(UChar32, bool mirror); |
| template <typename TextIterator> |
| inline unsigned advanceInternal(TextIterator&, GlyphBuffer*); |
| |
| enum class TransformsType { None, Forced, NotForced }; |
| TransformsType shouldApplyFontTransforms(const GlyphBuffer*, unsigned lastGlyphCount, UChar32 previousCharacter) const; |
| float applyFontTransforms(GlyphBuffer*, bool ltr, unsigned& lastGlyphCount, const Font*, UChar32 previousCharacter, bool force, CharactersTreatedAsSpace&); |
| |
| HashSet<const Font*>* m_fallbackFonts { nullptr }; |
| bool m_accountForGlyphBounds { false }; |
| bool m_enableKerning { false }; |
| bool m_requiresShaping { false }; |
| bool m_forTextEmphasis { false }; |
| float m_maxGlyphBoundingBoxY { std::numeric_limits<float>::min() }; |
| float m_minGlyphBoundingBoxY { std::numeric_limits<float>::max() }; |
| float m_firstGlyphOverflow { 0 }; |
| float m_lastGlyphOverflow { 0 }; |
| }; |
| |
| } |
| |
| #endif |