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, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved. 6 * Copyright (C) 2007 Nicholas Shanks <webkit (at) nickshanks.com> 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.LIother.m_ If not, write to 20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 21 * Boston, MA 02110-1301, USm_ 22 * 23 */ 24 25 #ifndef FontDescription_h 26 #define FontDescription_h 27 28 #include "platform/FontFamilyNames.h" 29 #include "platform/fonts/FontCacheKey.h" 30 #include "platform/fonts/FontFamily.h" 31 #include "platform/fonts/FontFeatureSettings.h" 32 #include "platform/fonts/FontOrientation.h" 33 #include "platform/fonts/FontSmoothingMode.h" 34 #include "platform/fonts/FontTraits.h" 35 #include "platform/fonts/FontWidthVariant.h" 36 #include "platform/fonts/TextRenderingMode.h" 37 #include "platform/fonts/TypesettingFeatures.h" 38 #include "platform/text/NonCJKGlyphOrientation.h" 39 #include "wtf/MathExtras.h" 40 41 #include "wtf/RefPtr.h" 42 43 #include <unicode/uscript.h> 44 45 namespace WebCore { 46 47 class PLATFORM_EXPORT FontDescription { 48 public: 49 enum GenericFamilyType { NoFamily, StandardFamily, SerifFamily, SansSerifFamily, 50 MonospaceFamily, CursiveFamily, FantasyFamily, PictographFamily }; 51 52 enum Kerning { AutoKerning, NormalKerning, NoneKerning }; 53 54 enum LigaturesState { NormalLigaturesState, DisabledLigaturesState, EnabledLigaturesState }; 55 56 FontDescription() 57 : m_locale("en") 58 , m_specifiedSize(0) 59 , m_computedSize(0) 60 , m_letterSpacing(0) 61 , m_wordSpacing(0) 62 , m_orientation(Horizontal) 63 , m_nonCJKGlyphOrientation(NonCJKGlyphOrientationVerticalRight) 64 , m_widthVariant(RegularWidth) 65 , m_style(FontStyleNormal) 66 , m_variant(FontVariantNormal) 67 , m_isAbsoluteSize(false) 68 , m_weight(FontWeightNormal) 69 , m_stretch(FontStretchNormal) 70 , m_genericFamily(NoFamily) 71 , m_kerning(AutoKerning) 72 , m_commonLigaturesState(NormalLigaturesState) 73 , m_discretionaryLigaturesState(NormalLigaturesState) 74 , m_historicalLigaturesState(NormalLigaturesState) 75 , m_contextualLigaturesState(NormalLigaturesState) 76 , m_keywordSize(0) 77 , m_fontSmoothing(AutoSmoothing) 78 , m_textRendering(AutoTextRendering) 79 , m_script(USCRIPT_COMMON) 80 , m_syntheticBold(false) 81 , m_syntheticItalic(false) 82 , m_subpixelTextPosition(s_useSubpixelTextPositioning) 83 , m_typesettingFeatures(s_defaultTypesettingFeatures) 84 { 85 } 86 87 bool operator==(const FontDescription&) const; 88 bool operator!=(const FontDescription& other) const { return !(*this == other); } 89 90 const FontFamily& family() const { return m_familyList; } 91 FontFamily& firstFamily() { return m_familyList; } 92 float specifiedSize() const { return m_specifiedSize; } 93 float computedSize() const { return m_computedSize; } 94 FontStyle style() const { return static_cast<FontStyle>(m_style); } 95 int computedPixelSize() const { return int(m_computedSize + 0.5f); } 96 FontVariant variant() const { return static_cast<FontVariant>(m_variant); } 97 bool isAbsoluteSize() const { return m_isAbsoluteSize; } 98 FontWeight weight() const { return static_cast<FontWeight>(m_weight); } 99 FontStretch stretch() const { return static_cast<FontStretch>(m_stretch); } 100 FontWeight lighterWeight() const; 101 FontWeight bolderWeight() const; 102 GenericFamilyType genericFamily() const { return static_cast<GenericFamilyType>(m_genericFamily); } 103 104 // only use fixed default size when there is only one font family, and that family is "monospace" 105 bool useFixedDefaultSize() const { return genericFamily() == MonospaceFamily && !family().next() && family().family() == FontFamilyNames::webkit_monospace; } 106 Kerning kerning() const { return static_cast<Kerning>(m_kerning); } 107 LigaturesState commonLigaturesState() const { return static_cast<LigaturesState>(m_commonLigaturesState); } 108 LigaturesState discretionaryLigaturesState() const { return static_cast<LigaturesState>(m_discretionaryLigaturesState); } 109 LigaturesState historicalLigaturesState() const { return static_cast<LigaturesState>(m_historicalLigaturesState); } 110 LigaturesState contextualLigaturesState() const { return static_cast<LigaturesState>(m_contextualLigaturesState); } 111 unsigned keywordSize() const { return m_keywordSize; } 112 FontSmoothingMode fontSmoothing() const { return static_cast<FontSmoothingMode>(m_fontSmoothing); } 113 TextRenderingMode textRendering() const { return static_cast<TextRenderingMode>(m_textRendering); } 114 UScriptCode script() const { return static_cast<UScriptCode>(m_script); } 115 const String& locale() const { return m_locale; } 116 bool isSyntheticBold() const { return m_syntheticBold; } 117 bool isSyntheticItalic() const { return m_syntheticItalic; } 118 bool useSubpixelPositioning() const { return m_subpixelTextPosition; } 119 120 FontTraits traits() const; 121 float wordSpacing() const { return m_wordSpacing; } 122 float letterSpacing() const { return m_letterSpacing; } 123 FontOrientation orientation() const { return static_cast<FontOrientation>(m_orientation); } 124 NonCJKGlyphOrientation nonCJKGlyphOrientation() const { return static_cast<NonCJKGlyphOrientation>(m_nonCJKGlyphOrientation); } 125 FontWidthVariant widthVariant() const { return static_cast<FontWidthVariant>(m_widthVariant); } 126 FontFeatureSettings* featureSettings() const { return m_featureSettings.get(); } 127 FontDescription makeNormalFeatureSettings() const; 128 129 float effectiveFontSize() const; // Returns either the computedSize or the computedPixelSize 130 FontCacheKey cacheKey(const AtomicString& familyName, FontTraits desiredTraits = FontTraits(0)) const; 131 132 void setFamily(const FontFamily& family) { m_familyList = family; } 133 void setComputedSize(float s) { m_computedSize = clampToFloat(s); } 134 void setSpecifiedSize(float s) { m_specifiedSize = clampToFloat(s); } 135 void setStyle(FontStyle i) { m_style = i; } 136 void setVariant(FontVariant c) { m_variant = c; } 137 void setIsAbsoluteSize(bool s) { m_isAbsoluteSize = s; } 138 void setWeight(FontWeight w) { m_weight = w; } 139 void setStretch(FontStretch s) { m_stretch = s; } 140 void setGenericFamily(GenericFamilyType genericFamily) { m_genericFamily = genericFamily; } 141 void setKerning(Kerning kerning) { m_kerning = kerning; updateTypesettingFeatures(); } 142 void setCommonLigaturesState(LigaturesState commonLigaturesState) { m_commonLigaturesState = commonLigaturesState; updateTypesettingFeatures(); } 143 void setDiscretionaryLigaturesState(LigaturesState discretionaryLigaturesState) { m_discretionaryLigaturesState = discretionaryLigaturesState; updateTypesettingFeatures(); } 144 void setHistoricalLigaturesState(LigaturesState historicalLigaturesState) { m_historicalLigaturesState = historicalLigaturesState; updateTypesettingFeatures(); } 145 void setContextualLigaturesState(LigaturesState contextualLigaturesState) { m_contextualLigaturesState = contextualLigaturesState; updateTypesettingFeatures(); } 146 void setKeywordSize(unsigned s) { m_keywordSize = s; } 147 void setFontSmoothing(FontSmoothingMode smoothing) { m_fontSmoothing = smoothing; } 148 void setTextRendering(TextRenderingMode rendering) { m_textRendering = rendering; updateTypesettingFeatures(); } 149 void setOrientation(FontOrientation orientation) { m_orientation = orientation; } 150 void setNonCJKGlyphOrientation(NonCJKGlyphOrientation orientation) { m_nonCJKGlyphOrientation = orientation; } 151 void setWidthVariant(FontWidthVariant widthVariant) { m_widthVariant = widthVariant; } 152 void setScript(UScriptCode s) { m_script = s; } 153 void setLocale(const String& locale) { m_locale = locale; } 154 void setSyntheticBold(bool syntheticBold) { m_syntheticBold = syntheticBold; } 155 void setSyntheticItalic(bool syntheticItalic) { m_syntheticItalic = syntheticItalic; } 156 void setFeatureSettings(PassRefPtr<FontFeatureSettings> settings) { m_featureSettings = settings; } 157 void setTraits(FontTraits); 158 void setWordSpacing(float s) { m_wordSpacing = s; } 159 void setLetterSpacing(float s) { m_letterSpacing = s; } 160 161 TypesettingFeatures typesettingFeatures() const { return static_cast<TypesettingFeatures>(m_typesettingFeatures); } 162 163 static void setSubpixelPositioning(bool b) { s_useSubpixelTextPositioning = b; } 164 static bool subpixelPositioning() { return s_useSubpixelTextPositioning; } 165 166 static void setDefaultTypesettingFeatures(TypesettingFeatures); 167 static TypesettingFeatures defaultTypesettingFeatures(); 168 169 private: 170 FontFamily m_familyList; // The list of font families to be used. 171 RefPtr<FontFeatureSettings> m_featureSettings; 172 String m_locale; 173 174 void updateTypesettingFeatures() const; 175 176 float m_specifiedSize; // Specified CSS value. Independent of rendering issues such as integer 177 // rounding, minimum font sizes, and zooming. 178 float m_computedSize; // Computed size adjusted for the minimum font size and the zoom factor. 179 180 float m_letterSpacing; 181 float m_wordSpacing; 182 183 unsigned m_orientation : 1; // FontOrientation - Whether the font is rendering on a horizontal line or a vertical line. 184 unsigned m_nonCJKGlyphOrientation : 1; // NonCJKGlyphOrientation - Only used by vertical text. Determines the default orientation for non-ideograph glyphs. 185 186 unsigned m_widthVariant : 2; // FontWidthVariant 187 188 unsigned m_style : 1; // FontStyle 189 unsigned m_variant : 1; // FontVariant 190 unsigned m_isAbsoluteSize : 1; // Whether or not CSS specified an explicit size 191 // (logical sizes like "medium" don't count). 192 unsigned m_weight : 4; // FontWeight 193 unsigned m_stretch : 4; // FontStretch 194 unsigned m_genericFamily : 3; // GenericFamilyType 195 196 unsigned m_kerning : 2; // Kerning 197 198 unsigned m_commonLigaturesState : 2; 199 unsigned m_discretionaryLigaturesState : 2; 200 unsigned m_historicalLigaturesState : 2; 201 unsigned m_contextualLigaturesState : 2; 202 203 unsigned m_keywordSize : 4; // We cache whether or not a font is currently represented by a CSS keyword (e.g., medium). If so, 204 // then we can accurately translate across different generic families to adjust for different preference settings 205 // (e.g., 13px monospace vs. 16px everything else). Sizes are 1-8 (like the HTML size values for <font>). 206 207 unsigned m_fontSmoothing : 2; // FontSmoothingMode 208 unsigned m_textRendering : 2; // TextRenderingMode 209 unsigned m_script : 7; // Used to help choose an appropriate font for generic font families. 210 unsigned m_syntheticBold : 1; 211 unsigned m_syntheticItalic : 1; 212 unsigned m_subpixelTextPosition : 1; 213 214 mutable unsigned m_typesettingFeatures : 2; // TypesettingFeatures 215 216 static TypesettingFeatures s_defaultTypesettingFeatures; 217 218 static bool s_useSubpixelTextPositioning; 219 }; 220 221 inline bool FontDescription::operator==(const FontDescription& other) const 222 { 223 return m_familyList == other.m_familyList 224 && m_specifiedSize == other.m_specifiedSize 225 && m_computedSize == other.m_computedSize 226 && m_letterSpacing == other.m_letterSpacing 227 && m_wordSpacing == other.m_wordSpacing 228 && m_style == other.m_style 229 && m_variant == other.m_variant 230 && m_isAbsoluteSize == other.m_isAbsoluteSize 231 && m_weight == other.m_weight 232 && m_stretch == other.m_stretch 233 && m_genericFamily == other.m_genericFamily 234 && m_kerning == other.m_kerning 235 && m_commonLigaturesState == other.m_commonLigaturesState 236 && m_discretionaryLigaturesState == other.m_discretionaryLigaturesState 237 && m_historicalLigaturesState == other.m_historicalLigaturesState 238 && m_contextualLigaturesState == other.m_contextualLigaturesState 239 && m_keywordSize == other.m_keywordSize 240 && m_fontSmoothing == other.m_fontSmoothing 241 && m_textRendering == other.m_textRendering 242 && m_orientation == other.m_orientation 243 && m_nonCJKGlyphOrientation == other.m_nonCJKGlyphOrientation 244 && m_widthVariant == other.m_widthVariant 245 && m_script == other.m_script 246 && m_syntheticBold == other.m_syntheticBold 247 && m_syntheticItalic == other.m_syntheticItalic 248 && m_featureSettings == other.m_featureSettings 249 && m_subpixelTextPosition == other.m_subpixelTextPosition; 250 } 251 252 } 253 254 #endif 255
