1 /* 2 * Copyright (C) 2007, 2008, 2009 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 "GlyphBuffer.h" 29 #include <wtf/HashSet.h> 30 #include <wtf/PassRefPtr.h> 31 #include <wtf/RefCounted.h> 32 #include <wtf/RetainPtr.h> 33 #include <wtf/Vector.h> 34 #include <wtf/unicode/Unicode.h> 35 36 namespace WebCore { 37 38 class Font; 39 class SimpleFontData; 40 class TextRun; 41 42 // ComplexTextController is responsible for rendering and measuring glyphs for 43 // complex scripts on OS X. 44 // The underlying API can be selected at compile time based on USE(ATSUI) and 45 // USE(CORE_TEXT). If both are defined then the Core Text APIs are used for 46 // OS Versions >= 10.6, ATSUI is used otherwise. 47 class ComplexTextController { 48 public: 49 ComplexTextController(const Font*, const TextRun&, bool mayUseNaturalWritingDirection = false, HashSet<const SimpleFontData*>* fallbackFonts = 0); 50 51 // Advance and emit glyphs up to the specified character. 52 void advance(unsigned to, GlyphBuffer* = 0); 53 54 // Compute the character offset for a given x coordinate. 55 int offsetForPosition(int x, bool includePartialGlyphs); 56 57 // Returns the width of everything we've consumed so far. 58 float runWidthSoFar() const { return m_runWidthSoFar; } 59 60 float totalWidth() const { return m_totalWidth; } 61 62 // Extra width to the left of the leftmost glyph. 63 float finalRoundingWidth() const { return m_finalRoundingWidth; } 64 65 private: 66 class ComplexTextRun : public RefCounted<ComplexTextRun> { 67 public: 68 #if USE(CORE_TEXT) 69 static PassRefPtr<ComplexTextRun> create(CTRunRef ctRun, const SimpleFontData* fontData, const UChar* characters, unsigned stringLocation, size_t stringLength) 70 { 71 return adoptRef(new ComplexTextRun(ctRun, fontData, characters, stringLocation, stringLength)); 72 } 73 #endif 74 #if USE(ATSUI) 75 static PassRefPtr<ComplexTextRun> create(ATSUTextLayout atsuTextLayout, const SimpleFontData* fontData, const UChar* characters, unsigned stringLocation, size_t stringLength, bool ltr, bool directionalOverride) 76 { 77 return adoptRef(new ComplexTextRun(atsuTextLayout, fontData, characters, stringLocation, stringLength, ltr, directionalOverride)); 78 } 79 #endif 80 static PassRefPtr<ComplexTextRun> create(const SimpleFontData* fontData, const UChar* characters, unsigned stringLocation, size_t stringLength, bool ltr) 81 { 82 return adoptRef(new ComplexTextRun(fontData, characters, stringLocation, stringLength, ltr)); 83 } 84 85 unsigned glyphCount() const { return m_glyphCount; } 86 const SimpleFontData* fontData() const { return m_fontData; } 87 const UChar* characters() const { return m_characters; } 88 unsigned stringLocation() const { return m_stringLocation; } 89 size_t stringLength() const { return m_stringLength; } 90 ALWAYS_INLINE CFIndex indexAt(size_t i) const; 91 CFIndex endOffsetAt(size_t i) const { ASSERT(!m_isMonotonic); return m_glyphEndOffsets[i]; } 92 const CGGlyph* glyphs() const { return m_glyphs; } 93 const CGSize* advances() const { return m_advances; } 94 bool isMonotonic() const { return m_isMonotonic; } 95 void setIsNonMonotonic(); 96 97 private: 98 #if USE(CORE_TEXT) 99 ComplexTextRun(CTRunRef, const SimpleFontData*, const UChar* characters, unsigned stringLocation, size_t stringLength); 100 void createTextRunFromFontDataCoreText(bool ltr); 101 #endif 102 #if USE(ATSUI) 103 ComplexTextRun(ATSUTextLayout, const SimpleFontData*, const UChar* characters, unsigned stringLocation, size_t stringLength, bool ltr, bool directionalOverride); 104 void createTextRunFromFontDataATSUI(bool ltr); 105 #endif 106 ComplexTextRun(const SimpleFontData*, const UChar* characters, unsigned stringLocation, size_t stringLength, bool ltr); 107 108 #if USE(ATSUI) 109 #ifdef BUILDING_ON_TIGER 110 typedef UInt32 URefCon; 111 #endif 112 static OSStatus overrideLayoutOperation(ATSULayoutOperationSelector, ATSULineRef, URefCon, void*, ATSULayoutOperationCallbackStatus*); 113 #endif 114 115 #if USE(CORE_TEXT) 116 RetainPtr<CTRunRef> m_coreTextRun; 117 #endif 118 unsigned m_glyphCount; 119 const SimpleFontData* m_fontData; 120 const UChar* m_characters; 121 unsigned m_stringLocation; 122 size_t m_stringLength; 123 #if USE(CORE_TEXT) 124 RetainPtr<CFMutableDataRef> m_coreTextIndicesData; 125 const CFIndex* m_coreTextIndices; 126 #endif 127 #if USE(ATSUI) 128 Vector<CFIndex, 64> m_atsuiIndices; 129 #endif 130 Vector<CFIndex, 64> m_glyphEndOffsets; 131 Vector<CGGlyph, 64> m_glyphsVector; 132 const CGGlyph* m_glyphs; 133 Vector<CGSize, 64> m_advancesVector; 134 const CGSize* m_advances; 135 #if USE(ATSUI) 136 bool m_directionalOverride; 137 #endif 138 bool m_isMonotonic; 139 }; 140 141 void collectComplexTextRuns(); 142 143 // collectComplexTextRunsForCharacters() is a stub function that calls through to the ATSUI or Core Text variants based 144 // on the API in use. 145 void collectComplexTextRunsForCharacters(const UChar*, unsigned length, unsigned stringLocation, const SimpleFontData*); 146 void collectComplexTextRunsForCharactersATSUI(const UChar*, unsigned length, unsigned stringLocation, const SimpleFontData*); 147 void collectComplexTextRunsForCharactersCoreText(const UChar*, unsigned length, unsigned stringLocation, const SimpleFontData*); 148 void adjustGlyphsAndAdvances(); 149 150 const Font& m_font; 151 const TextRun& m_run; 152 bool m_mayUseNaturalWritingDirection; 153 154 Vector<UChar, 256> m_smallCapsBuffer; 155 156 Vector<RefPtr<ComplexTextRun>, 16> m_complexTextRuns; 157 Vector<CGSize, 256> m_adjustedAdvances; 158 Vector<CGGlyph, 256> m_adjustedGlyphs; 159 160 unsigned m_currentCharacter; 161 int m_end; 162 163 CGFloat m_totalWidth; 164 165 float m_runWidthSoFar; 166 unsigned m_numGlyphsSoFar; 167 size_t m_currentRun; 168 unsigned m_glyphInCurrentRun; 169 unsigned m_characterInCurrentGlyph; 170 float m_finalRoundingWidth; 171 float m_padding; 172 float m_padPerSpace; 173 174 HashSet<const SimpleFontData*>* m_fallbackFonts; 175 176 unsigned m_lastRoundingGlyph; 177 }; 178 179 } // namespace WebCore 180 181 #endif // ComplexTextController_h 182
