1 /* 2 * Copyright (C) 2000 Lars Knoll (knoll (at) kde.org) 3 * (C) 2000 Antti Koivisto (koivisto (at) kde.org) 4 * (C) 2000 Dirk Mueller (mueller (at) kde.org) 5 * Copyright (C) 2003, 2006, 2007, 2010, 2011 Apple Inc. All rights reserved. 6 * Copyright (C) 2008 Holger Hans Peter Freyther 7 * 8 * This library is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Library General Public 10 * License as published by the Free Software Foundation; either 11 * version 2 of the License, or (at your option) any later version. 12 * 13 * This library is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Library General Public License for more details. 17 * 18 * You should have received a copy of the GNU Library General Public License 19 * along with this library; see the file COPYING.LIB. If not, write to 20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 21 * Boston, MA 02110-1301, USA. 22 * 23 */ 24 25 #ifndef Font_h 26 #define Font_h 27 28 #include "FontDescription.h" 29 #include "FontFallbackList.h" 30 #include "SimpleFontData.h" 31 #include "TextDirection.h" 32 #include "TypesettingFeatures.h" 33 #include <wtf/HashMap.h> 34 #include <wtf/HashSet.h> 35 #include <wtf/MathExtras.h> 36 #include <wtf/unicode/CharacterNames.h> 37 38 #if PLATFORM(QT) 39 #include <QFont> 40 #endif 41 42 namespace WebCore { 43 44 class FloatPoint; 45 class FloatRect; 46 class FontData; 47 class FontMetrics; 48 class FontPlatformData; 49 class FontSelector; 50 class GlyphBuffer; 51 class GlyphPageTreeNode; 52 class GraphicsContext; 53 class SVGFontElement; 54 class TextRun; 55 56 struct GlyphData; 57 58 struct GlyphOverflow { 59 GlyphOverflow() 60 : left(0) 61 , right(0) 62 , top(0) 63 , bottom(0) 64 , computeBounds(false) 65 { 66 } 67 68 int left; 69 int right; 70 int top; 71 int bottom; 72 bool computeBounds; 73 }; 74 75 76 class Font { 77 public: 78 Font(); 79 Font(const FontDescription&, short letterSpacing, short wordSpacing); 80 // This constructor is only used if the platform wants to start with a native font. 81 Font(const FontPlatformData&, bool isPrinting, FontSmoothingMode = AutoSmoothing); 82 ~Font(); 83 84 Font(const Font&); 85 Font& operator=(const Font&); 86 87 bool operator==(const Font& other) const; 88 bool operator!=(const Font& other) const { return !(*this == other); } 89 90 const FontDescription& fontDescription() const { return m_fontDescription; } 91 92 int pixelSize() const { return fontDescription().computedPixelSize(); } 93 float size() const { return fontDescription().computedSize(); } 94 95 void update(PassRefPtr<FontSelector>) const; 96 97 void drawText(GraphicsContext*, const TextRun&, const FloatPoint&, int from = 0, int to = -1) const; 98 void drawEmphasisMarks(GraphicsContext*, const TextRun&, const AtomicString& mark, const FloatPoint&, int from = 0, int to = -1) const; 99 100 float width(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const; 101 float width(const TextRun&, int extraCharsAvailable, int& charsConsumed, String& glyphName) const; 102 103 int offsetForPosition(const TextRun&, float position, bool includePartialGlyphs) const; 104 FloatRect selectionRectForText(const TextRun&, const FloatPoint&, int h, int from = 0, int to = -1) const; 105 106 bool isSmallCaps() const { return m_fontDescription.smallCaps(); } 107 108 short wordSpacing() const { return m_wordSpacing; } 109 short letterSpacing() const { return m_letterSpacing; } 110 void setWordSpacing(short s) { m_wordSpacing = s; } 111 void setLetterSpacing(short s) { m_letterSpacing = s; } 112 bool isFixedPitch() const; 113 bool isPrinterFont() const { return m_fontDescription.usePrinterFont(); } 114 115 FontRenderingMode renderingMode() const { return m_fontDescription.renderingMode(); } 116 117 TypesettingFeatures typesettingFeatures() const 118 { 119 TextRenderingMode textRenderingMode = m_fontDescription.textRenderingMode(); 120 return textRenderingMode == OptimizeLegibility || textRenderingMode == GeometricPrecision ? Kerning | Ligatures : 0; 121 } 122 123 FontFamily& firstFamily() { return m_fontDescription.firstFamily(); } 124 const FontFamily& family() const { return m_fontDescription.family(); } 125 126 bool italic() const { return m_fontDescription.italic(); } 127 FontWeight weight() const { return m_fontDescription.weight(); } 128 FontWidthVariant widthVariant() const { return m_fontDescription.widthVariant(); } 129 130 bool isPlatformFont() const { return m_isPlatformFont; } 131 132 // Metrics that we query the FontFallbackList for. 133 const FontMetrics& fontMetrics() const { return primaryFont()->fontMetrics(); } 134 float spaceWidth() const { return primaryFont()->spaceWidth() + m_letterSpacing; } 135 float tabWidth(const SimpleFontData& fontData) const { return 8 * fontData.spaceWidth() + letterSpacing(); } 136 int emphasisMarkAscent(const AtomicString&) const; 137 int emphasisMarkDescent(const AtomicString&) const; 138 int emphasisMarkHeight(const AtomicString&) const; 139 140 const SimpleFontData* primaryFont() const; 141 const FontData* fontDataAt(unsigned) const; 142 GlyphData glyphDataForCharacter(UChar32, bool mirror, FontDataVariant = AutoVariant) const; 143 bool primaryFontHasGlyphForCharacter(UChar32) const; 144 145 static bool isCJKIdeograph(UChar32); 146 static bool isCJKIdeographOrSymbol(UChar32); 147 148 static unsigned expansionOpportunityCount(const UChar*, size_t length, TextDirection, bool& isAfterExpansion); 149 150 #if PLATFORM(QT) 151 QFont font() const; 152 #endif 153 154 static void setShouldUseSmoothing(bool); 155 static bool shouldUseSmoothing(); 156 157 enum CodePath { Auto, Simple, Complex, SimpleWithGlyphOverflow }; 158 159 private: 160 #if ENABLE(SVG_FONTS) 161 void drawTextUsingSVGFont(GraphicsContext*, const TextRun&, const FloatPoint&, int from, int to) const; 162 float floatWidthUsingSVGFont(const TextRun&) const; 163 float floatWidthUsingSVGFont(const TextRun&, int extraCharsAvailable, int& charsConsumed, String& glyphName) const; 164 FloatRect selectionRectForTextUsingSVGFont(const TextRun&, const FloatPoint&, int h, int from, int to) const; 165 int offsetForPositionForTextUsingSVGFont(const TextRun&, float position, bool includePartialGlyphs) const; 166 #endif 167 168 enum ForTextEmphasisOrNot { NotForTextEmphasis, ForTextEmphasis }; 169 170 // Returns the initial in-stream advance. 171 float getGlyphsAndAdvancesForSimpleText(const TextRun&, int from, int to, GlyphBuffer&, ForTextEmphasisOrNot = NotForTextEmphasis) const; 172 void drawSimpleText(GraphicsContext*, const TextRun&, const FloatPoint&, int from, int to) const; 173 void drawEmphasisMarksForSimpleText(GraphicsContext*, const TextRun&, const AtomicString& mark, const FloatPoint&, int from, int to) const; 174 void drawGlyphs(GraphicsContext*, const SimpleFontData*, const GlyphBuffer&, int from, int to, const FloatPoint&) const; 175 void drawGlyphBuffer(GraphicsContext*, const GlyphBuffer&, const FloatPoint&) const; 176 void drawEmphasisMarks(GraphicsContext* context, const GlyphBuffer&, const AtomicString&, const FloatPoint&) const; 177 float floatWidthForSimpleText(const TextRun&, GlyphBuffer*, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const; 178 int offsetForPositionForSimpleText(const TextRun&, float position, bool includePartialGlyphs) const; 179 FloatRect selectionRectForSimpleText(const TextRun&, const FloatPoint&, int h, int from, int to) const; 180 181 bool getEmphasisMarkGlyphData(const AtomicString&, GlyphData&) const; 182 183 static bool canReturnFallbackFontsForComplexText(); 184 static bool canExpandAroundIdeographsInComplexText(); 185 186 CodePath codePath(const TextRun&) const; 187 188 // Returns the initial in-stream advance. 189 float getGlyphsAndAdvancesForComplexText(const TextRun&, int from, int to, GlyphBuffer&, ForTextEmphasisOrNot = NotForTextEmphasis) const; 190 void drawComplexText(GraphicsContext*, const TextRun&, const FloatPoint&, int from, int to) const; 191 void drawEmphasisMarksForComplexText(GraphicsContext*, const TextRun&, const AtomicString& mark, const FloatPoint&, int from, int to) const; 192 float floatWidthForComplexText(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const; 193 int offsetForPositionForComplexText(const TextRun&, float position, bool includePartialGlyphs) const; 194 FloatRect selectionRectForComplexText(const TextRun&, const FloatPoint&, int h, int from, int to) const; 195 196 friend struct WidthIterator; 197 198 public: 199 // Useful for debugging the different font rendering code paths. 200 static void setCodePath(CodePath); 201 static CodePath codePath(); 202 static CodePath s_codePath; 203 204 FontSelector* fontSelector() const; 205 static bool treatAsSpace(UChar c) { return c == ' ' || c == '\t' || c == '\n' || c == noBreakSpace; } 206 static bool treatAsZeroWidthSpace(UChar c) { return treatAsZeroWidthSpaceInComplexScript(c) || c == 0x200c || c == 0x200d; } 207 static bool treatAsZeroWidthSpaceInComplexScript(UChar c) { return c < 0x20 || (c >= 0x7F && c < 0xA0) || c == softHyphen || (c >= 0x200e && c <= 0x200f) || (c >= 0x202a && c <= 0x202e) || c == zeroWidthNoBreakSpace || c == objectReplacementCharacter; } 208 static bool canReceiveTextEmphasis(UChar32 c); 209 210 static inline UChar normalizeSpaces(UChar character) 211 { 212 if (treatAsSpace(character)) 213 return space; 214 215 if (treatAsZeroWidthSpace(character)) 216 return zeroWidthSpace; 217 218 return character; 219 } 220 221 static String normalizeSpaces(const UChar*, unsigned length); 222 223 #if ENABLE(SVG_FONTS) 224 bool isSVGFont() const; 225 SVGFontElement* svgFont() const; 226 #endif 227 228 bool needsTranscoding() const { return m_needsTranscoding; } 229 230 private: 231 bool loadingCustomFonts() const 232 { 233 return m_fontList && m_fontList->loadingCustomFonts(); 234 } 235 236 FontDescription m_fontDescription; 237 mutable RefPtr<FontFallbackList> m_fontList; 238 short m_letterSpacing; 239 short m_wordSpacing; 240 bool m_isPlatformFont; 241 bool m_needsTranscoding; 242 }; 243 244 inline Font::~Font() 245 { 246 } 247 248 inline const SimpleFontData* Font::primaryFont() const 249 { 250 ASSERT(m_fontList); 251 return m_fontList->primarySimpleFontData(this); 252 } 253 254 inline const FontData* Font::fontDataAt(unsigned index) const 255 { 256 ASSERT(m_fontList); 257 return m_fontList->fontDataAt(this, index); 258 } 259 260 inline bool Font::isFixedPitch() const 261 { 262 ASSERT(m_fontList); 263 return m_fontList->isFixedPitch(this); 264 } 265 266 inline FontSelector* Font::fontSelector() const 267 { 268 return m_fontList ? m_fontList->fontSelector() : 0; 269 } 270 271 } 272 273 #endif 274
