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| 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 "platform/fonts/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/text/WTFString.h" | |
| 34 #include "wtf/unicode/Unicode.h" | |
| 35 #include "wtf/Vector.h" | |
| 36 | |
| 37 typedef unsigned short CGGlyph; | |
| 38 | |
| 39 typedef const struct __CTRun * CTRunRef; | |
| 40 typedef const struct __CTLine * CTLineRef; | |
| 41 | |
| 42 namespace WebCore { | |
| 43 | |
| 44 class Font; | |
| 45 class SimpleFontData; | |
| 46 class TextRun; | |
| 47 | |
| 48 enum GlyphIterationStyle { IncludePartialGlyphs, ByWholeGlyphs }; | |
| 49 | |
| 50 // ComplexTextController is responsible for rendering and measuring glyphs for | |
| 51 // complex scripts on OS X. | |
| 52 class ComplexTextController { | |
| 53 public: | |
| 54 ComplexTextController(const Font*, const TextRun&, bool mayUseNaturalWriting
Direction = false, HashSet<const SimpleFontData*>* fallbackFonts = 0, bool forTe
xtEmphasis = false); | |
| 55 | |
| 56 // Advance and emit glyphs up to the specified character. | |
| 57 void advance(unsigned to, GlyphBuffer* = 0, GlyphIterationStyle = IncludePar
tialGlyphs, HashSet<const SimpleFontData*>* fallbackFonts = 0); | |
| 58 | |
| 59 // Compute the character offset for a given x coordinate. | |
| 60 int offsetForPosition(float x, bool includePartialGlyphs); | |
| 61 | |
| 62 // Returns the width of everything we've consumed so far. | |
| 63 float runWidthSoFar() const { return m_runWidthSoFar; } | |
| 64 | |
| 65 float totalWidth() const { return m_totalWidth; } | |
| 66 | |
| 67 float finalRoundingWidth() const { return m_finalRoundingWidth; } | |
| 68 | |
| 69 float minGlyphBoundingBoxX() const { return m_minGlyphBoundingBoxX; } | |
| 70 float maxGlyphBoundingBoxX() const { return m_maxGlyphBoundingBoxX; } | |
| 71 float minGlyphBoundingBoxY() const { return m_minGlyphBoundingBoxY; } | |
| 72 float maxGlyphBoundingBoxY() const { return m_maxGlyphBoundingBoxY; } | |
| 73 | |
| 74 private: | |
| 75 class ComplexTextRun : public RefCounted<ComplexTextRun> { | |
| 76 public: | |
| 77 static PassRefPtr<ComplexTextRun> create(CTRunRef ctRun, const SimpleFon
tData* fontData, const UChar* characters, unsigned stringLocation, size_t string
Length, CFRange runRange) | |
| 78 { | |
| 79 return adoptRef(new ComplexTextRun(ctRun, fontData, characters, stri
ngLocation, stringLength, runRange)); | |
| 80 } | |
| 81 | |
| 82 static PassRefPtr<ComplexTextRun> create(const SimpleFontData* fontData,
const UChar* characters, unsigned stringLocation, size_t stringLength, bool ltr
) | |
| 83 { | |
| 84 return adoptRef(new ComplexTextRun(fontData, characters, stringLocat
ion, stringLength, ltr)); | |
| 85 } | |
| 86 | |
| 87 unsigned glyphCount() const { return m_glyphCount; } | |
| 88 const SimpleFontData* fontData() const { return m_fontData; } | |
| 89 const UChar* characters() const { return m_characters; } | |
| 90 unsigned stringLocation() const { return m_stringLocation; } | |
| 91 size_t stringLength() const { return m_stringLength; } | |
| 92 ALWAYS_INLINE CFIndex indexAt(size_t i) const; | |
| 93 CFIndex indexBegin() const { return m_indexBegin; } | |
| 94 CFIndex indexEnd() const { return m_indexEnd; } | |
| 95 CFIndex endOffsetAt(size_t i) const { ASSERT(!m_isMonotonic); return m_g
lyphEndOffsets[i]; } | |
| 96 const CGGlyph* glyphs() const { return m_glyphs; } | |
| 97 const CGSize* advances() const { return m_advances; } | |
| 98 bool isLTR() const { return m_isLTR; } | |
| 99 bool isMonotonic() const { return m_isMonotonic; } | |
| 100 void setIsNonMonotonic(); | |
| 101 | |
| 102 private: | |
| 103 ComplexTextRun(CTRunRef, const SimpleFontData*, const UChar* characters,
unsigned stringLocation, size_t stringLength, CFRange runRange); | |
| 104 ComplexTextRun(const SimpleFontData*, const UChar* characters, unsigned
stringLocation, size_t stringLength, bool ltr); | |
| 105 | |
| 106 unsigned m_glyphCount; | |
| 107 const SimpleFontData* m_fontData; | |
| 108 const UChar* m_characters; | |
| 109 unsigned m_stringLocation; | |
| 110 size_t m_stringLength; | |
| 111 Vector<CFIndex, 64> m_coreTextIndicesVector; | |
| 112 const CFIndex* m_coreTextIndices; | |
| 113 CFIndex m_indexBegin; | |
| 114 CFIndex m_indexEnd; | |
| 115 Vector<CFIndex, 64> m_glyphEndOffsets; | |
| 116 Vector<CGGlyph, 64> m_glyphsVector; | |
| 117 const CGGlyph* m_glyphs; | |
| 118 Vector<CGSize, 64> m_advancesVector; | |
| 119 const CGSize* m_advances; | |
| 120 bool m_isLTR; | |
| 121 bool m_isMonotonic; | |
| 122 }; | |
| 123 | |
| 124 static unsigned stringBegin(const ComplexTextRun& run) { return run.stringLo
cation() + run.indexBegin(); } | |
| 125 static unsigned stringEnd(const ComplexTextRun& run) { return run.stringLoca
tion() + run.indexEnd(); } | |
| 126 | |
| 127 void collectComplexTextRuns(); | |
| 128 | |
| 129 void collectComplexTextRunsForCharacters(const UChar*, unsigned length, unsi
gned stringLocation, const SimpleFontData*); | |
| 130 void adjustGlyphsAndAdvances(); | |
| 131 | |
| 132 unsigned findNextRunIndex(unsigned runIndex) const; | |
| 133 unsigned indexOfCurrentRun(unsigned& leftmostGlyph); | |
| 134 unsigned incrementCurrentRun(unsigned& leftmostGlyph); | |
| 135 | |
| 136 // The initial capacity of these vectors was selected as being the smallest
power of two greater than | |
| 137 // the average (3.5) plus one standard deviation (7.5) of nonzero sizes used
on Arabic Wikipedia. | |
| 138 Vector<unsigned, 16> m_runIndices; | |
| 139 Vector<unsigned, 16> m_glyphCountFromStartToIndex; | |
| 140 | |
| 141 const Font& m_font; | |
| 142 const TextRun& m_run; | |
| 143 bool m_isLTROnly; | |
| 144 bool m_mayUseNaturalWritingDirection; | |
| 145 bool m_forTextEmphasis; | |
| 146 | |
| 147 Vector<String> m_stringsFor8BitRuns; | |
| 148 Vector<UChar, 256> m_smallCapsBuffer; | |
| 149 | |
| 150 // Retain lines rather than their runs for better performance. | |
| 151 Vector<RetainPtr<CTLineRef> > m_coreTextLines; | |
| 152 Vector<RefPtr<ComplexTextRun>, 16> m_complexTextRuns; | |
| 153 Vector<CGSize, 256> m_adjustedAdvances; | |
| 154 Vector<CGGlyph, 256> m_adjustedGlyphs; | |
| 155 | |
| 156 unsigned m_currentCharacter; | |
| 157 int m_end; | |
| 158 | |
| 159 CGFloat m_totalWidth; | |
| 160 | |
| 161 float m_runWidthSoFar; | |
| 162 unsigned m_numGlyphsSoFar; | |
| 163 size_t m_currentRun; | |
| 164 unsigned m_glyphInCurrentRun; | |
| 165 unsigned m_characterInCurrentGlyph; | |
| 166 float m_finalRoundingWidth; | |
| 167 float m_expansion; | |
| 168 float m_expansionPerOpportunity; | |
| 169 float m_leadingExpansion; | |
| 170 bool m_afterExpansion; | |
| 171 | |
| 172 HashSet<const SimpleFontData*>* m_fallbackFonts; | |
| 173 | |
| 174 float m_minGlyphBoundingBoxX; | |
| 175 float m_maxGlyphBoundingBoxX; | |
| 176 float m_minGlyphBoundingBoxY; | |
| 177 float m_maxGlyphBoundingBoxY; | |
| 178 | |
| 179 unsigned m_lastRoundingGlyph; | |
| 180 }; | |
| 181 | |
| 182 } // namespace WebCore | |
| 183 | |
| 184 #endif // ComplexTextController_h | |
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Chromium Code Reviews
Issue 99103006:
Moving GraphicsContext and dependencies from core to platform. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk