OLD | NEW |
(Empty) | |
| 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 AN
Y |
| 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 AN
Y |
| 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 O
N |
| 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 "wtf/HashSet.h" |
| 29 #include "wtf/PassRefPtr.h" |
| 30 #include "wtf/RefCounted.h" |
| 31 #include "wtf/RetainPtr.h" |
| 32 #include "wtf/text/WTFString.h" |
| 33 #include "wtf/unicode/Unicode.h" |
| 34 #include "wtf/Vector.h" |
| 35 #include <ApplicationServices/ApplicationServices.h> |
| 36 |
| 37 typedef unsigned short CGGlyph; |
| 38 |
| 39 typedef const struct __CTRun * CTRunRef; |
| 40 typedef const struct __CTLine * CTLineRef; |
| 41 |
| 42 namespace blink { |
| 43 |
| 44 class Font; |
| 45 class GlyphBuffer; |
| 46 class SimpleFontData; |
| 47 class TextRun; |
| 48 |
| 49 enum GlyphIterationStyle { IncludePartialGlyphs, ByWholeGlyphs }; |
| 50 |
| 51 // ComplexTextController is responsible for rendering and measuring glyphs for |
| 52 // complex scripts on OS X. |
| 53 class ComplexTextController { |
| 54 public: |
| 55 ComplexTextController(const Font*, const TextRun&, bool mayUseNaturalWriting
Direction = false, HashSet<const SimpleFontData*>* fallbackFonts = 0, bool forTe
xtEmphasis = false); |
| 56 |
| 57 // Advance and emit glyphs up to the specified character. |
| 58 void advance(unsigned to, GlyphBuffer* = 0, GlyphIterationStyle = IncludePar
tialGlyphs, HashSet<const SimpleFontData*>* fallbackFonts = 0); |
| 59 |
| 60 // Compute the character offset for a given x coordinate. |
| 61 int offsetForPosition(float x, bool includePartialGlyphs); |
| 62 |
| 63 // Returns the width of everything we've consumed so far. |
| 64 float runWidthSoFar() const { return m_runWidthSoFar; } |
| 65 |
| 66 float totalWidth() const { return m_totalWidth; } |
| 67 |
| 68 float minGlyphBoundingBoxX() const { return m_minGlyphBoundingBoxX; } |
| 69 float maxGlyphBoundingBoxX() const { return m_maxGlyphBoundingBoxX; } |
| 70 float minGlyphBoundingBoxY() const { return m_minGlyphBoundingBoxY; } |
| 71 float maxGlyphBoundingBoxY() const { return m_maxGlyphBoundingBoxY; } |
| 72 |
| 73 private: |
| 74 class ComplexTextRun : public RefCounted<ComplexTextRun> { |
| 75 public: |
| 76 static PassRefPtr<ComplexTextRun> create(CTRunRef ctRun, const SimpleFon
tData* fontData, const UChar* characters, unsigned stringLocation, size_t string
Length, CFRange runRange) |
| 77 { |
| 78 return adoptRef(new ComplexTextRun(ctRun, fontData, characters, stri
ngLocation, stringLength, runRange)); |
| 79 } |
| 80 |
| 81 static PassRefPtr<ComplexTextRun> create(const SimpleFontData* fontData,
const UChar* characters, unsigned stringLocation, size_t stringLength, bool ltr
) |
| 82 { |
| 83 return adoptRef(new ComplexTextRun(fontData, characters, stringLocat
ion, stringLength, ltr)); |
| 84 } |
| 85 |
| 86 unsigned glyphCount() const { return m_glyphCount; } |
| 87 const SimpleFontData* fontData() const { return m_fontData; } |
| 88 const UChar* characters() const { return m_characters; } |
| 89 unsigned stringLocation() const { return m_stringLocation; } |
| 90 size_t stringLength() const { return m_stringLength; } |
| 91 ALWAYS_INLINE CFIndex indexAt(size_t i) const; |
| 92 CFIndex indexBegin() const { return m_indexBegin; } |
| 93 CFIndex indexEnd() const { return m_indexEnd; } |
| 94 CFIndex endOffsetAt(size_t i) const { ASSERT(!m_isMonotonic); return m_g
lyphEndOffsets[i]; } |
| 95 const CGGlyph* glyphs() const { return m_glyphs; } |
| 96 const CGSize* advances() const { return m_advances; } |
| 97 bool isLTR() const { return m_isLTR; } |
| 98 bool isMonotonic() const { return m_isMonotonic; } |
| 99 void setIsNonMonotonic(); |
| 100 |
| 101 private: |
| 102 ComplexTextRun(CTRunRef, const SimpleFontData*, const UChar* characters,
unsigned stringLocation, size_t stringLength, CFRange runRange); |
| 103 ComplexTextRun(const SimpleFontData*, const UChar* characters, unsigned
stringLocation, size_t stringLength, bool ltr); |
| 104 |
| 105 unsigned m_glyphCount; |
| 106 const SimpleFontData* m_fontData; |
| 107 const UChar* m_characters; |
| 108 unsigned m_stringLocation; |
| 109 size_t m_stringLength; |
| 110 Vector<CFIndex, 64> m_coreTextIndicesVector; |
| 111 const CFIndex* m_coreTextIndices; |
| 112 CFIndex m_indexBegin; |
| 113 CFIndex m_indexEnd; |
| 114 Vector<CFIndex, 64> m_glyphEndOffsets; |
| 115 Vector<CGGlyph, 64> m_glyphsVector; |
| 116 const CGGlyph* m_glyphs; |
| 117 Vector<CGSize, 64> m_advancesVector; |
| 118 const CGSize* m_advances; |
| 119 bool m_isLTR; |
| 120 bool m_isMonotonic; |
| 121 }; |
| 122 |
| 123 static unsigned stringBegin(const ComplexTextRun& run) { return run.stringLo
cation() + run.indexBegin(); } |
| 124 static unsigned stringEnd(const ComplexTextRun& run) { return run.stringLoca
tion() + run.indexEnd(); } |
| 125 |
| 126 void collectComplexTextRuns(); |
| 127 |
| 128 void collectComplexTextRunsForCharacters(const UChar*, unsigned length, unsi
gned stringLocation, const SimpleFontData*); |
| 129 void adjustGlyphsAndAdvances(); |
| 130 |
| 131 unsigned findNextRunIndex(unsigned runIndex) const; |
| 132 unsigned indexOfCurrentRun(unsigned& leftmostGlyph); |
| 133 unsigned incrementCurrentRun(unsigned& leftmostGlyph); |
| 134 |
| 135 // The initial capacity of these vectors was selected as being the smallest
power of two greater than |
| 136 // the average (3.5) plus one standard deviation (7.5) of nonzero sizes used
on Arabic Wikipedia. |
| 137 Vector<unsigned, 16> m_runIndices; |
| 138 Vector<unsigned, 16> m_glyphCountFromStartToIndex; |
| 139 |
| 140 const Font& m_font; |
| 141 const TextRun& m_run; |
| 142 bool m_isLTROnly; |
| 143 bool m_mayUseNaturalWritingDirection; |
| 144 bool m_forTextEmphasis; |
| 145 |
| 146 Vector<String> m_stringsFor8BitRuns; |
| 147 Vector<UChar, 256> m_smallCapsBuffer; |
| 148 |
| 149 // Retain lines rather than their runs for better performance. |
| 150 Vector<RetainPtr<CTLineRef> > m_coreTextLines; |
| 151 Vector<RefPtr<ComplexTextRun>, 16> m_complexTextRuns; |
| 152 Vector<CGSize, 256> m_adjustedAdvances; |
| 153 Vector<CGGlyph, 256> m_adjustedGlyphs; |
| 154 |
| 155 unsigned m_currentCharacter; |
| 156 int m_end; |
| 157 |
| 158 CGFloat m_totalWidth; |
| 159 |
| 160 float m_runWidthSoFar; |
| 161 unsigned m_numGlyphsSoFar; |
| 162 size_t m_currentRun; |
| 163 unsigned m_glyphInCurrentRun; |
| 164 unsigned m_characterInCurrentGlyph; |
| 165 float m_expansion; |
| 166 float m_expansionPerOpportunity; |
| 167 float m_leadingExpansion; |
| 168 bool m_afterExpansion; |
| 169 |
| 170 HashSet<const SimpleFontData*>* m_fallbackFonts; |
| 171 |
| 172 float m_minGlyphBoundingBoxX; |
| 173 float m_maxGlyphBoundingBoxX; |
| 174 float m_minGlyphBoundingBoxY; |
| 175 float m_maxGlyphBoundingBoxY; |
| 176 }; |
| 177 |
| 178 } // namespace blink |
| 179 |
| 180 #endif // ComplexTextController_h |
OLD | NEW |