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117 lines
3.5 KiB
C++
117 lines
3.5 KiB
C++
/*
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* Copyright (C) 2003, 2006, 2008, 2011 Apple Inc. All rights reserved.
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* Copyright (C) 2008 Holger Hans Peter Freyther
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* Copyright (C) 2014 Google Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef SKY_ENGINE_PLATFORM_FONTS_WIDTHITERATOR_H_
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#define SKY_ENGINE_PLATFORM_FONTS_WIDTHITERATOR_H_
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#include "flutter/sky/engine/platform/PlatformExport.h"
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#include "flutter/sky/engine/platform/text/TextRun.h"
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#include "flutter/sky/engine/wtf/HashSet.h"
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#include "flutter/sky/engine/wtf/Vector.h"
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#include "flutter/sky/engine/wtf/unicode/Unicode.h"
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namespace blink {
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class Font;
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class GlyphBuffer;
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class SimpleFontData;
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class TextRun;
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struct GlyphData;
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struct PLATFORM_EXPORT WidthIterator {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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WidthIterator(const Font*,
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const TextRun&,
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HashSet<const SimpleFontData*>* fallbackFonts = 0,
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bool accountForGlyphBounds = false,
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bool forTextEmphasis = false);
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unsigned advance(int to, GlyphBuffer* = 0);
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bool advanceOneCharacter(float& width);
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float maxGlyphBoundingBoxY() const {
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ASSERT(m_accountForGlyphBounds);
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return m_maxGlyphBoundingBoxY;
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}
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float minGlyphBoundingBoxY() const {
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ASSERT(m_accountForGlyphBounds);
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return m_minGlyphBoundingBoxY;
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}
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float firstGlyphOverflow() const {
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ASSERT(m_accountForGlyphBounds);
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return m_firstGlyphOverflow;
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}
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float lastGlyphOverflow() const {
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ASSERT(m_accountForGlyphBounds);
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return m_lastGlyphOverflow;
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}
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const TextRun& run() const { return m_run; }
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float runWidthSoFar() const { return m_runWidthSoFar; }
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const Font* m_font;
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const TextRun& m_run;
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unsigned m_currentCharacter;
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float m_runWidthSoFar;
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float m_expansion;
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float m_expansionPerOpportunity;
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bool m_isAfterExpansion;
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private:
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struct CharacterData {
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UChar32 character;
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unsigned clusterLength;
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int characterOffset;
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};
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GlyphData glyphDataForCharacter(CharacterData&);
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float characterWidth(UChar32, const GlyphData&) const;
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void cacheFallbackFont(UChar32,
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const SimpleFontData*,
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const SimpleFontData* primaryFont);
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float adjustSpacing(float,
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const CharacterData&,
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const SimpleFontData&,
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GlyphBuffer*);
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void updateGlyphBounds(const GlyphData&, float width, bool firstCharacter);
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template <typename TextIterator>
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unsigned advanceInternal(TextIterator&, GlyphBuffer*);
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HashSet<const SimpleFontData*>* m_fallbackFonts;
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float m_maxGlyphBoundingBoxY;
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float m_minGlyphBoundingBoxY;
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float m_firstGlyphOverflow;
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float m_lastGlyphOverflow;
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bool m_accountForGlyphBounds : 1;
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bool m_forTextEmphasis : 1;
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};
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} // namespace blink
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#endif // SKY_ENGINE_PLATFORM_FONTS_WIDTHITERATOR_H_
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