1 /* 2 * Copyright (C) 2007, 2008, 2009, 2011 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY 17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 25 #ifndef ComplexTextController_h 26 #define ComplexTextController_h 27 28 #include <ApplicationServices/ApplicationServices.h> 29 #include "GlyphBuffer.h" 30 #include <wtf/HashSet.h> 31 #include <wtf/PassRefPtr.h> 32 #include <wtf/RefCounted.h> 33 #include <wtf/RetainPtr.h> 34 #include <wtf/Vector.h> 35 #include <wtf/unicode/Unicode.h> 36 37 namespace WebCore { 38 39 class Font; 40 class SimpleFontData; 41 class TextRun; 42 43 // ComplexTextController is responsible for rendering and measuring glyphs for 44 // complex scripts on OS X. 45 // The underlying API can be selected at compile time based on USE(ATSUI) and 46 // USE(CORE_TEXT). If both are defined then the Core Text APIs are used for 47 // OS Versions >= 10.6, ATSUI is used otherwise. 48 class ComplexTextController { 49 public: 50 ComplexTextController(const Font*, const TextRun&, bool mayUseNaturalWritingDirection = false, HashSet<const SimpleFontData*>* fallbackFonts = 0, bool forTextEmphasis = false); 51 52 // Advance and emit glyphs up to the specified character. 53 void advance(unsigned to, GlyphBuffer* = 0); 54 55 // Compute the character offset for a given x coordinate. 56 int offsetForPosition(float x, bool includePartialGlyphs); 57 58 // Returns the width of everything we've consumed so far. 59 float runWidthSoFar() const { return m_runWidthSoFar; } 60 61 float totalWidth() const { return m_totalWidth; } 62 63 float minGlyphBoundingBoxX() const { return m_minGlyphBoundingBoxX; } 64 float maxGlyphBoundingBoxX() const { return m_maxGlyphBoundingBoxX; } 65 float minGlyphBoundingBoxY() const { return m_minGlyphBoundingBoxY; } 66 float maxGlyphBoundingBoxY() const { return m_maxGlyphBoundingBoxY; } 67 68 private: 69 class ComplexTextRun : public RefCounted<ComplexTextRun> { 70 public: 71 #if USE(CORE_TEXT) 72 static PassRefPtr<ComplexTextRun> create(CTRunRef ctRun, const SimpleFontData* fontData, const UChar* characters, unsigned stringLocation, size_t stringLength, CFRange runRange) 73 { 74 return adoptRef(new ComplexTextRun(ctRun, fontData, characters, stringLocation, stringLength, runRange)); 75 } 76 #endif 77 #if USE(ATSUI) 78 static PassRefPtr<ComplexTextRun> create(ATSUTextLayout atsuTextLayout, const SimpleFontData* fontData, const UChar* characters, unsigned stringLocation, size_t stringLength, bool ltr, bool directionalOverride) 79 { 80 return adoptRef(new ComplexTextRun(atsuTextLayout, fontData, characters, stringLocation, stringLength, ltr, directionalOverride)); 81 } 82 #endif 83 static PassRefPtr<ComplexTextRun> create(const SimpleFontData* fontData, const UChar* characters, unsigned stringLocation, size_t stringLength, bool ltr) 84 { 85 return adoptRef(new ComplexTextRun(fontData, characters, stringLocation, stringLength, ltr)); 86 } 87 88 unsigned glyphCount() const { return m_glyphCount; } 89 const SimpleFontData* fontData() const { return m_fontData; } 90 const UChar* characters() const { return m_characters; } 91 unsigned stringLocation() const { return m_stringLocation; } 92 size_t stringLength() const { return m_stringLength; } 93 ALWAYS_INLINE CFIndex indexAt(size_t i) const; 94 CFIndex indexEnd() const { return m_indexEnd; } 95 CFIndex endOffsetAt(size_t i) const { ASSERT(!m_isMonotonic); return m_glyphEndOffsets[i]; } 96 const CGGlyph* glyphs() const { return m_glyphs; } 97 const CGSize* advances() const { return m_advances; } 98 bool isMonotonic() const { return m_isMonotonic; } 99 void setIsNonMonotonic(); 100 101 private: 102 #if USE(CORE_TEXT) 103 ComplexTextRun(CTRunRef, const SimpleFontData*, const UChar* characters, unsigned stringLocation, size_t stringLength, CFRange runRange); 104 void createTextRunFromFontDataCoreText(bool ltr); 105 #endif 106 #if USE(ATSUI) 107 ComplexTextRun(ATSUTextLayout, const SimpleFontData*, const UChar* characters, unsigned stringLocation, size_t stringLength, bool ltr, bool directionalOverride); 108 void createTextRunFromFontDataATSUI(bool ltr); 109 #endif 110 ComplexTextRun(const SimpleFontData*, const UChar* characters, unsigned stringLocation, size_t stringLength, bool ltr); 111 112 #if USE(ATSUI) 113 #ifdef BUILDING_ON_TIGER 114 typedef UInt32 URefCon; 115 #endif 116 static OSStatus overrideLayoutOperation(ATSULayoutOperationSelector, ATSULineRef, URefCon, void*, ATSULayoutOperationCallbackStatus*); 117 #endif 118 119 unsigned m_glyphCount; 120 const SimpleFontData* m_fontData; 121 const UChar* m_characters; 122 unsigned m_stringLocation; 123 size_t m_stringLength; 124 #if USE(CORE_TEXT) 125 Vector<CFIndex, 64> m_coreTextIndicesVector; 126 const CFIndex* m_coreTextIndices; 127 #endif 128 #if USE(ATSUI) 129 Vector<CFIndex, 64> m_atsuiIndices; 130 #endif 131 CFIndex m_indexEnd; 132 Vector<CFIndex, 64> m_glyphEndOffsets; 133 Vector<CGGlyph, 64> m_glyphsVector; 134 const CGGlyph* m_glyphs; 135 Vector<CGSize, 64> m_advancesVector; 136 const CGSize* m_advances; 137 #if USE(ATSUI) 138 bool m_directionalOverride; 139 #endif 140 bool m_isMonotonic; 141 }; 142 143 void collectComplexTextRuns(); 144 145 // collectComplexTextRunsForCharacters() is a stub function that calls through to the ATSUI or Core Text variants based 146 // on the API in use. 147 void collectComplexTextRunsForCharacters(const UChar*, unsigned length, unsigned stringLocation, const SimpleFontData*); 148 void collectComplexTextRunsForCharactersATSUI(const UChar*, unsigned length, unsigned stringLocation, const SimpleFontData*); 149 void collectComplexTextRunsForCharactersCoreText(const UChar*, unsigned length, unsigned stringLocation, const SimpleFontData*); 150 void adjustGlyphsAndAdvances(); 151 152 const Font& m_font; 153 const TextRun& m_run; 154 bool m_mayUseNaturalWritingDirection; 155 bool m_forTextEmphasis; 156 157 Vector<UChar, 256> m_smallCapsBuffer; 158 159 #if USE(CORE_TEXT) 160 // Retain lines rather than their runs for better performance. 161 Vector<RetainPtr<CTLineRef> > m_coreTextLines; 162 #endif 163 Vector<RefPtr<ComplexTextRun>, 16> m_complexTextRuns; 164 Vector<CGSize, 256> m_adjustedAdvances; 165 Vector<CGGlyph, 256> m_adjustedGlyphs; 166 167 unsigned m_currentCharacter; 168 int m_end; 169 170 CGFloat m_totalWidth; 171 172 float m_runWidthSoFar; 173 unsigned m_numGlyphsSoFar; 174 size_t m_currentRun; 175 unsigned m_glyphInCurrentRun; 176 unsigned m_characterInCurrentGlyph; 177 float m_expansion; 178 float m_expansionPerOpportunity; 179 float m_leadingExpansion; 180 bool m_afterExpansion; 181 182 HashSet<const SimpleFontData*>* m_fallbackFonts; 183 184 float m_minGlyphBoundingBoxX; 185 float m_maxGlyphBoundingBoxX; 186 float m_minGlyphBoundingBoxY; 187 float m_maxGlyphBoundingBoxY; 188 }; 189 190 } // namespace WebCore 191 192 #endif // ComplexTextController_h 193
