1 /* 2 * This file is part of the internal font implementation. 3 * 4 * Copyright (C) 2006, 2008, 2010 Apple Inc. All rights reserved. 5 * Copyright (C) 2007-2008 Torch Mobile, Inc. 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Library General Public 9 * License as published by the Free Software Foundation; either 10 * version 2 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Library General Public License for more details. 16 * 17 * You should have received a copy of the GNU Library General Public License 18 * along with this library; see the file COPYING.LIB. If not, write to 19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 20 * Boston, MA 02110-1301, USA. 21 * 22 */ 23 24 #ifndef SimpleFontData_h 25 #define SimpleFontData_h 26 27 #include "platform/PlatformExport.h" 28 #include "platform/fonts/CustomFontData.h" 29 #include "platform/fonts/FontBaseline.h" 30 #include "platform/fonts/FontData.h" 31 #include "platform/fonts/FontMetrics.h" 32 #include "platform/fonts/FontPlatformData.h" 33 #include "platform/fonts/GlyphMetricsMap.h" 34 #include "platform/fonts/GlyphPageTreeNode.h" 35 #include "platform/fonts/TypesettingFeatures.h" 36 #include "platform/fonts/opentype/OpenTypeVerticalData.h" 37 #include "platform/geometry/FloatRect.h" 38 #include "wtf/OwnPtr.h" 39 #include "wtf/PassOwnPtr.h" 40 #include "wtf/text/StringHash.h" 41 42 #if OS(MACOSX) 43 #include "wtf/RetainPtr.h" 44 #endif 45 46 namespace WebCore { 47 48 class CSSFontFaceSource; 49 class FontDescription; 50 class SharedBuffer; 51 struct WidthIterator; 52 53 enum FontDataVariant { AutoVariant, NormalVariant, SmallCapsVariant, EmphasisMarkVariant, BrokenIdeographVariant }; 54 enum Pitch { UnknownPitch, FixedPitch, VariablePitch }; 55 56 class PLATFORM_EXPORT SimpleFontData : public FontData { 57 public: 58 // Used to create platform fonts. 59 static PassRefPtr<SimpleFontData> create(const FontPlatformData& platformData, PassRefPtr<CustomFontData> customData = nullptr, bool isTextOrientationFallback = false) 60 { 61 return adoptRef(new SimpleFontData(platformData, customData, isTextOrientationFallback)); 62 } 63 64 // Used to create SVG Fonts. 65 static PassRefPtr<SimpleFontData> create(PassRefPtr<CustomFontData> customData, float fontSize, bool syntheticBold, bool syntheticItalic) 66 { 67 return adoptRef(new SimpleFontData(customData, fontSize, syntheticBold, syntheticItalic)); 68 } 69 70 virtual ~SimpleFontData(); 71 72 static const SimpleFontData* systemFallback() { return reinterpret_cast<const SimpleFontData*>(-1); } 73 74 const FontPlatformData& platformData() const { return m_platformData; } 75 #if ENABLE(OPENTYPE_VERTICAL) 76 const OpenTypeVerticalData* verticalData() const { return m_verticalData.get(); } 77 #endif 78 79 PassRefPtr<SimpleFontData> smallCapsFontData(const FontDescription&) const; 80 PassRefPtr<SimpleFontData> emphasisMarkFontData(const FontDescription&) const; 81 PassRefPtr<SimpleFontData> brokenIdeographFontData() const; 82 83 PassRefPtr<SimpleFontData> variantFontData(const FontDescription& description, FontDataVariant variant) const 84 { 85 switch (variant) { 86 case SmallCapsVariant: 87 return smallCapsFontData(description); 88 case EmphasisMarkVariant: 89 return emphasisMarkFontData(description); 90 case BrokenIdeographVariant: 91 return brokenIdeographFontData(); 92 case AutoVariant: 93 case NormalVariant: 94 break; 95 } 96 ASSERT_NOT_REACHED(); 97 return const_cast<SimpleFontData*>(this); 98 } 99 100 PassRefPtr<SimpleFontData> verticalRightOrientationFontData() const; 101 PassRefPtr<SimpleFontData> uprightOrientationFontData() const; 102 103 bool hasVerticalGlyphs() const { return m_hasVerticalGlyphs; } 104 bool isTextOrientationFallback() const { return m_isTextOrientationFallback; } 105 106 FontMetrics& fontMetrics() { return m_fontMetrics; } 107 const FontMetrics& fontMetrics() const { return m_fontMetrics; } 108 float sizePerUnit() const { return platformData().size() / (fontMetrics().unitsPerEm() ? fontMetrics().unitsPerEm() : 1); } 109 110 float maxCharWidth() const { return m_maxCharWidth; } 111 void setMaxCharWidth(float maxCharWidth) { m_maxCharWidth = maxCharWidth; } 112 113 float avgCharWidth() const { return m_avgCharWidth; } 114 void setAvgCharWidth(float avgCharWidth) { m_avgCharWidth = avgCharWidth; } 115 116 FloatRect boundsForGlyph(Glyph) const; 117 float widthForGlyph(Glyph glyph) const; 118 FloatRect platformBoundsForGlyph(Glyph) const; 119 float platformWidthForGlyph(Glyph) const; 120 121 float spaceWidth() const { return m_spaceWidth; } 122 float adjustedSpaceWidth() const { return m_adjustedSpaceWidth; } 123 void setSpaceWidth(float spaceWidth) { m_spaceWidth = spaceWidth; } 124 125 #if OS(MACOSX) 126 float syntheticBoldOffset() const { return m_syntheticBoldOffset; } 127 #endif 128 129 Glyph spaceGlyph() const { return m_spaceGlyph; } 130 void setSpaceGlyph(Glyph spaceGlyph) { m_spaceGlyph = spaceGlyph; } 131 Glyph zeroWidthSpaceGlyph() const { return m_zeroWidthSpaceGlyph; } 132 void setZeroWidthSpaceGlyph(Glyph spaceGlyph) { m_zeroWidthSpaceGlyph = spaceGlyph; } 133 bool isZeroWidthSpaceGlyph(Glyph glyph) const { return glyph == m_zeroWidthSpaceGlyph && glyph; } 134 Glyph zeroGlyph() const { return m_zeroGlyph; } 135 void setZeroGlyph(Glyph zeroGlyph) { m_zeroGlyph = zeroGlyph; } 136 137 virtual const SimpleFontData* fontDataForCharacter(UChar32) const OVERRIDE; 138 139 Glyph glyphForCharacter(UChar32) const; 140 141 void determinePitch(); 142 Pitch pitch() const { return m_treatAsFixedPitch ? FixedPitch : VariablePitch; } 143 144 bool isSVGFont() const { return m_customFontData && m_customFontData->isSVGFont(); } 145 virtual bool isCustomFont() const OVERRIDE { return m_customFontData; } 146 virtual bool isLoading() const OVERRIDE { return m_customFontData ? m_customFontData->isLoading() : false; } 147 virtual bool isLoadingFallback() const OVERRIDE { return m_customFontData ? m_customFontData->isLoadingFallback() : false; } 148 virtual bool isSegmented() const OVERRIDE; 149 virtual bool shouldSkipDrawing() const OVERRIDE { return m_customFontData && m_customFontData->shouldSkipDrawing(); } 150 151 const GlyphData& missingGlyphData() const { return m_missingGlyphData; } 152 void setMissingGlyphData(const GlyphData& glyphData) { m_missingGlyphData = glyphData; } 153 154 #ifndef NDEBUG 155 virtual String description() const OVERRIDE; 156 #endif 157 158 #if OS(MACOSX) 159 const SimpleFontData* getCompositeFontReferenceFontData(NSFont *key) const; 160 NSFont* getNSFont() const { return m_platformData.font(); } 161 #endif 162 163 #if OS(MACOSX) 164 CFDictionaryRef getCFStringAttributes(TypesettingFeatures, FontOrientation) const; 165 #endif 166 167 bool canRenderCombiningCharacterSequence(const UChar*, size_t) const; 168 169 PassRefPtr<CustomFontData> customFontData() const { return m_customFontData; } 170 171 // Implemented by the platform. 172 virtual bool fillGlyphPage(GlyphPage* pageToFill, unsigned offset, unsigned length, UChar* buffer, unsigned bufferLength) const; 173 174 protected: 175 SimpleFontData(const FontPlatformData&, PassRefPtr<CustomFontData> customData, bool isTextOrientationFallback = false); 176 177 SimpleFontData(PassRefPtr<CustomFontData> customData, float fontSize, bool syntheticBold, bool syntheticItalic); 178 179 private: 180 void platformInit(); 181 void platformGlyphInit(); 182 void platformCharWidthInit(); 183 void platformDestroy(); 184 185 void initCharWidths(); 186 187 PassRefPtr<SimpleFontData> createScaledFontData(const FontDescription&, float scaleFactor) const; 188 PassRefPtr<SimpleFontData> platformCreateScaledFontData(const FontDescription&, float scaleFactor) const; 189 190 FontMetrics m_fontMetrics; 191 float m_maxCharWidth; 192 float m_avgCharWidth; 193 194 FontPlatformData m_platformData; 195 196 mutable OwnPtr<GlyphMetricsMap<FloatRect> > m_glyphToBoundsMap; 197 mutable GlyphMetricsMap<float> m_glyphToWidthMap; 198 199 bool m_treatAsFixedPitch; 200 201 bool m_isTextOrientationFallback; 202 bool m_isBrokenIdeographFallback; 203 #if ENABLE(OPENTYPE_VERTICAL) 204 RefPtr<OpenTypeVerticalData> m_verticalData; 205 #endif 206 bool m_hasVerticalGlyphs; 207 208 Glyph m_spaceGlyph; 209 float m_spaceWidth; 210 Glyph m_zeroGlyph; 211 float m_adjustedSpaceWidth; 212 213 Glyph m_zeroWidthSpaceGlyph; 214 215 GlyphData m_missingGlyphData; 216 217 struct DerivedFontData { 218 static PassOwnPtr<DerivedFontData> create(bool forCustomFont); 219 ~DerivedFontData(); 220 221 bool forCustomFont; 222 RefPtr<SimpleFontData> smallCaps; 223 RefPtr<SimpleFontData> emphasisMark; 224 RefPtr<SimpleFontData> brokenIdeograph; 225 RefPtr<SimpleFontData> verticalRightOrientation; 226 RefPtr<SimpleFontData> uprightOrientation; 227 #if OS(MACOSX) 228 mutable RetainPtr<CFMutableDictionaryRef> compositeFontReferences; 229 #endif 230 231 private: 232 DerivedFontData(bool custom) 233 : forCustomFont(custom) 234 { 235 } 236 }; 237 238 mutable OwnPtr<DerivedFontData> m_derivedFontData; 239 240 RefPtr<CustomFontData> m_customFontData; 241 242 #if OS(MACOSX) 243 float m_syntheticBoldOffset; 244 245 mutable HashMap<unsigned, RetainPtr<CFDictionaryRef> > m_CFStringAttributes; 246 #endif 247 248 mutable OwnPtr<HashMap<String, bool> > m_combiningCharacterSequenceSupport; 249 }; 250 251 ALWAYS_INLINE FloatRect SimpleFontData::boundsForGlyph(Glyph glyph) const 252 { 253 if (isZeroWidthSpaceGlyph(glyph)) 254 return FloatRect(); 255 256 FloatRect bounds; 257 if (m_glyphToBoundsMap) { 258 bounds = m_glyphToBoundsMap->metricsForGlyph(glyph); 259 if (bounds.width() != cGlyphSizeUnknown) 260 return bounds; 261 } 262 263 bounds = platformBoundsForGlyph(glyph); 264 if (!m_glyphToBoundsMap) 265 m_glyphToBoundsMap = adoptPtr(new GlyphMetricsMap<FloatRect>); 266 m_glyphToBoundsMap->setMetricsForGlyph(glyph, bounds); 267 return bounds; 268 } 269 270 ALWAYS_INLINE float SimpleFontData::widthForGlyph(Glyph glyph) const 271 { 272 if (isZeroWidthSpaceGlyph(glyph)) 273 return 0; 274 275 float width = m_glyphToWidthMap.metricsForGlyph(glyph); 276 if (width != cGlyphSizeUnknown) 277 return width; 278 279 if (isSVGFont()) 280 width = m_customFontData->widthForSVGGlyph(glyph, m_platformData.size()); 281 #if ENABLE(OPENTYPE_VERTICAL) 282 else if (m_verticalData) 283 #if OS(MACOSX) 284 width = m_verticalData->advanceHeight(this, glyph) + m_syntheticBoldOffset; 285 #else 286 width = m_verticalData->advanceHeight(this, glyph); 287 #endif 288 #endif 289 else 290 width = platformWidthForGlyph(glyph); 291 292 m_glyphToWidthMap.setMetricsForGlyph(glyph, width); 293 return width; 294 } 295 296 } // namespace WebCore 297 #endif // SimpleFontData_h 298
