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 blink { 47 48 class FontDescription; 49 50 enum FontDataVariant { AutoVariant, NormalVariant, SmallCapsVariant, EmphasisMarkVariant, BrokenIdeographVariant }; 51 enum Pitch { UnknownPitch, FixedPitch, VariablePitch }; 52 53 class PLATFORM_EXPORT SimpleFontData : public FontData { 54 public: 55 // Used to create platform fonts. 56 static PassRefPtr<SimpleFontData> create(const FontPlatformData& platformData, PassRefPtr<CustomFontData> customData = nullptr, bool isTextOrientationFallback = false) 57 { 58 return adoptRef(new SimpleFontData(platformData, customData, isTextOrientationFallback)); 59 } 60 61 // Used to create SVG Fonts. 62 static PassRefPtr<SimpleFontData> create(PassRefPtr<CustomFontData> customData, float fontSize, bool syntheticBold, bool syntheticItalic) 63 { 64 return adoptRef(new SimpleFontData(customData, fontSize, syntheticBold, syntheticItalic)); 65 } 66 67 virtual ~SimpleFontData(); 68 69 static const SimpleFontData* systemFallback() { return reinterpret_cast<const SimpleFontData*>(-1); } 70 71 const FontPlatformData& platformData() const { return m_platformData; } 72 #if ENABLE(OPENTYPE_VERTICAL) 73 const OpenTypeVerticalData* verticalData() const { return m_verticalData.get(); } 74 #endif 75 76 PassRefPtr<SimpleFontData> smallCapsFontData(const FontDescription&) const; 77 PassRefPtr<SimpleFontData> emphasisMarkFontData(const FontDescription&) const; 78 PassRefPtr<SimpleFontData> brokenIdeographFontData() const; 79 80 PassRefPtr<SimpleFontData> variantFontData(const FontDescription& description, FontDataVariant variant) const 81 { 82 switch (variant) { 83 case SmallCapsVariant: 84 return smallCapsFontData(description); 85 case EmphasisMarkVariant: 86 return emphasisMarkFontData(description); 87 case BrokenIdeographVariant: 88 return brokenIdeographFontData(); 89 case AutoVariant: 90 case NormalVariant: 91 break; 92 } 93 ASSERT_NOT_REACHED(); 94 return const_cast<SimpleFontData*>(this); 95 } 96 97 PassRefPtr<SimpleFontData> verticalRightOrientationFontData() const; 98 PassRefPtr<SimpleFontData> uprightOrientationFontData() const; 99 100 bool hasVerticalGlyphs() const { return m_hasVerticalGlyphs; } 101 bool isTextOrientationFallback() const { return m_isTextOrientationFallback; } 102 103 FontMetrics& fontMetrics() { return m_fontMetrics; } 104 const FontMetrics& fontMetrics() const { return m_fontMetrics; } 105 float sizePerUnit() const { return platformData().size() / (fontMetrics().unitsPerEm() ? fontMetrics().unitsPerEm() : 1); } 106 107 float maxCharWidth() const { return m_maxCharWidth; } 108 void setMaxCharWidth(float maxCharWidth) { m_maxCharWidth = maxCharWidth; } 109 110 float avgCharWidth() const { return m_avgCharWidth; } 111 void setAvgCharWidth(float avgCharWidth) { m_avgCharWidth = avgCharWidth; } 112 113 FloatRect boundsForGlyph(Glyph) const; 114 float widthForGlyph(Glyph glyph) const; 115 FloatRect platformBoundsForGlyph(Glyph) const; 116 float platformWidthForGlyph(Glyph) const; 117 118 float spaceWidth() const { return m_spaceWidth; } 119 void setSpaceWidth(float spaceWidth) { m_spaceWidth = spaceWidth; } 120 121 #if OS(MACOSX) 122 float syntheticBoldOffset() const { return m_syntheticBoldOffset; } 123 #endif 124 125 Glyph spaceGlyph() const { return m_spaceGlyph; } 126 void setSpaceGlyph(Glyph spaceGlyph) { m_spaceGlyph = spaceGlyph; } 127 Glyph zeroWidthSpaceGlyph() const { return m_zeroWidthSpaceGlyph; } 128 void setZeroWidthSpaceGlyph(Glyph spaceGlyph) { m_zeroWidthSpaceGlyph = spaceGlyph; } 129 bool isZeroWidthSpaceGlyph(Glyph glyph) const { return glyph == m_zeroWidthSpaceGlyph && glyph; } 130 Glyph zeroGlyph() const { return m_zeroGlyph; } 131 void setZeroGlyph(Glyph zeroGlyph) { m_zeroGlyph = zeroGlyph; } 132 133 virtual const SimpleFontData* fontDataForCharacter(UChar32) const OVERRIDE; 134 135 Glyph glyphForCharacter(UChar32) const; 136 137 void determinePitch(); 138 Pitch pitch() const { return m_treatAsFixedPitch ? FixedPitch : VariablePitch; } 139 140 bool isSVGFont() const { return m_customFontData && m_customFontData->isSVGFont(); } 141 virtual bool isCustomFont() const OVERRIDE { return m_customFontData; } 142 virtual bool isLoading() const OVERRIDE { return m_customFontData ? m_customFontData->isLoading() : false; } 143 virtual bool isLoadingFallback() const OVERRIDE { return m_customFontData ? m_customFontData->isLoadingFallback() : false; } 144 virtual bool isSegmented() const OVERRIDE; 145 virtual bool shouldSkipDrawing() const OVERRIDE { return m_customFontData && m_customFontData->shouldSkipDrawing(); } 146 147 const GlyphData& missingGlyphData() const { return m_missingGlyphData; } 148 void setMissingGlyphData(const GlyphData& glyphData) { m_missingGlyphData = glyphData; } 149 150 #if OS(MACOSX) 151 const SimpleFontData* getCompositeFontReferenceFontData(NSFont *key) const; 152 NSFont* getNSFont() const { return m_platformData.font(); } 153 #endif 154 155 #if OS(MACOSX) 156 CFDictionaryRef getCFStringAttributes(TypesettingFeatures, FontOrientation) const; 157 #endif 158 159 bool canRenderCombiningCharacterSequence(const UChar*, size_t) const; 160 161 PassRefPtr<CustomFontData> customFontData() const { return m_customFontData; } 162 163 // Implemented by the platform. 164 virtual bool fillGlyphPage(GlyphPage* pageToFill, unsigned offset, unsigned length, UChar* buffer, unsigned bufferLength) const; 165 166 protected: 167 SimpleFontData(const FontPlatformData&, PassRefPtr<CustomFontData> customData, bool isTextOrientationFallback = false); 168 169 SimpleFontData(PassRefPtr<CustomFontData> customData, float fontSize, bool syntheticBold, bool syntheticItalic); 170 171 private: 172 void platformInit(); 173 void platformGlyphInit(); 174 void platformCharWidthInit(); 175 void platformDestroy(); 176 177 void initCharWidths(); 178 179 PassRefPtr<SimpleFontData> createScaledFontData(const FontDescription&, float scaleFactor) const; 180 PassRefPtr<SimpleFontData> platformCreateScaledFontData(const FontDescription&, float scaleFactor) const; 181 182 FontMetrics m_fontMetrics; 183 float m_maxCharWidth; 184 float m_avgCharWidth; 185 186 FontPlatformData m_platformData; 187 188 mutable OwnPtr<GlyphMetricsMap<FloatRect> > m_glyphToBoundsMap; 189 mutable GlyphMetricsMap<float> m_glyphToWidthMap; 190 191 bool m_treatAsFixedPitch; 192 193 bool m_isTextOrientationFallback; 194 bool m_isBrokenIdeographFallback; 195 #if ENABLE(OPENTYPE_VERTICAL) 196 RefPtr<OpenTypeVerticalData> m_verticalData; 197 #endif 198 bool m_hasVerticalGlyphs; 199 200 Glyph m_spaceGlyph; 201 float m_spaceWidth; 202 Glyph m_zeroGlyph; 203 204 Glyph m_zeroWidthSpaceGlyph; 205 206 GlyphData m_missingGlyphData; 207 208 struct DerivedFontData { 209 static PassOwnPtr<DerivedFontData> create(bool forCustomFont); 210 ~DerivedFontData(); 211 212 bool forCustomFont; 213 RefPtr<SimpleFontData> smallCaps; 214 RefPtr<SimpleFontData> emphasisMark; 215 RefPtr<SimpleFontData> brokenIdeograph; 216 RefPtr<SimpleFontData> verticalRightOrientation; 217 RefPtr<SimpleFontData> uprightOrientation; 218 #if OS(MACOSX) 219 mutable RetainPtr<CFMutableDictionaryRef> compositeFontReferences; 220 #endif 221 222 private: 223 DerivedFontData(bool custom) 224 : forCustomFont(custom) 225 { 226 } 227 }; 228 229 mutable OwnPtr<DerivedFontData> m_derivedFontData; 230 231 RefPtr<CustomFontData> m_customFontData; 232 233 #if OS(MACOSX) 234 float m_syntheticBoldOffset; 235 236 mutable HashMap<unsigned, RetainPtr<CFDictionaryRef> > m_CFStringAttributes; 237 #endif 238 239 mutable OwnPtr<HashMap<String, bool> > m_combiningCharacterSequenceSupport; 240 }; 241 242 ALWAYS_INLINE FloatRect SimpleFontData::boundsForGlyph(Glyph glyph) const 243 { 244 if (isZeroWidthSpaceGlyph(glyph)) 245 return FloatRect(); 246 247 FloatRect bounds; 248 if (m_glyphToBoundsMap) { 249 bounds = m_glyphToBoundsMap->metricsForGlyph(glyph); 250 if (bounds.width() != cGlyphSizeUnknown) 251 return bounds; 252 } 253 254 bounds = platformBoundsForGlyph(glyph); 255 if (!m_glyphToBoundsMap) 256 m_glyphToBoundsMap = adoptPtr(new GlyphMetricsMap<FloatRect>); 257 m_glyphToBoundsMap->setMetricsForGlyph(glyph, bounds); 258 return bounds; 259 } 260 261 ALWAYS_INLINE float SimpleFontData::widthForGlyph(Glyph glyph) const 262 { 263 if (isZeroWidthSpaceGlyph(glyph)) 264 return 0; 265 266 float width = m_glyphToWidthMap.metricsForGlyph(glyph); 267 if (width != cGlyphSizeUnknown) 268 return width; 269 270 if (isSVGFont()) 271 width = m_customFontData->widthForSVGGlyph(glyph, m_platformData.size()); 272 #if ENABLE(OPENTYPE_VERTICAL) 273 else if (m_verticalData) 274 #if OS(MACOSX) 275 width = m_verticalData->advanceHeight(this, glyph) + m_syntheticBoldOffset; 276 #else 277 width = m_verticalData->advanceHeight(this, glyph); 278 #endif 279 #endif 280 else 281 width = platformWidthForGlyph(glyph); 282 283 m_glyphToWidthMap.setMetricsForGlyph(glyph, width); 284 return width; 285 } 286 287 DEFINE_FONT_DATA_TYPE_CASTS(SimpleFontData, false); 288 289 } // namespace blink 290 #endif // SimpleFontData_h 291
