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 "platform/PlatformExport.h" 29 #include "platform/fonts/FontDescription.h" 30 #include "platform/fonts/FontFallbackList.h" 31 #include "platform/fonts/SimpleFontData.h" 32 #include "platform/fonts/TextBlob.h" 33 #include "platform/text/TextDirection.h" 34 #include "platform/text/TextPath.h" 35 #include "wtf/HashMap.h" 36 #include "wtf/HashSet.h" 37 #include "wtf/MathExtras.h" 38 #include "wtf/unicode/CharacterNames.h" 39 40 // "X11/X.h" defines Complex to 0 and conflicts 41 // with Complex value in CodePath enum. 42 #ifdef Complex 43 #undef Complex 44 #endif 45 46 class SkTextBlob; 47 struct SkPoint; 48 49 namespace blink { 50 51 class FloatPoint; 52 class FloatRect; 53 class FontData; 54 class FontMetrics; 55 class FontSelector; 56 class GlyphBuffer; 57 class GraphicsContext; 58 class TextRun; 59 struct TextRunPaintInfo; 60 61 struct GlyphData; 62 63 struct GlyphOverflow { 64 GlyphOverflow() 65 : left(0) 66 , right(0) 67 , top(0) 68 , bottom(0) 69 , computeBounds(false) 70 { 71 } 72 73 bool isZero() const 74 { 75 return !left && !right && !top && !bottom; 76 } 77 78 int left; 79 int right; 80 int top; 81 int bottom; 82 bool computeBounds; 83 }; 84 85 86 class PLATFORM_EXPORT Font { 87 public: 88 Font(); 89 Font(const FontDescription&); 90 ~Font(); 91 92 Font(const Font&); 93 Font& operator=(const Font&); 94 95 bool operator==(const Font& other) const; 96 bool operator!=(const Font& other) const { return !(*this == other); } 97 98 const FontDescription& fontDescription() const { return m_fontDescription; } 99 100 void update(PassRefPtrWillBeRawPtr<FontSelector>) const; 101 102 enum CustomFontNotReadyAction { DoNotPaintIfFontNotReady, UseFallbackIfFontNotReady }; 103 float drawText(GraphicsContext*, const TextRunPaintInfo&, const FloatPoint&, CustomFontNotReadyAction = DoNotPaintIfFontNotReady) const; 104 void drawEmphasisMarks(GraphicsContext*, const TextRunPaintInfo&, const AtomicString& mark, const FloatPoint&) const; 105 106 float width(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const; 107 float width(const TextRun&, int& charsConsumed, Glyph& glyphId) const; 108 109 int offsetForPosition(const TextRun&, float position, bool includePartialGlyphs) const; 110 FloatRect selectionRectForText(const TextRun&, const FloatPoint&, int h, int from = 0, int to = -1, bool accountForGlyphBounds = false) const; 111 112 bool isFixedPitch() const; 113 114 // Metrics that we query the FontFallbackList for. 115 const FontMetrics& fontMetrics() const { return primaryFont()->fontMetrics(); } 116 float spaceWidth() const { return primaryFont()->spaceWidth() + fontDescription().letterSpacing(); } 117 float tabWidth(const SimpleFontData&, unsigned tabSize, float position) const; 118 float tabWidth(unsigned tabSize, float position) const { return tabWidth(*primaryFont(), tabSize, position); } 119 120 int emphasisMarkAscent(const AtomicString&) const; 121 int emphasisMarkDescent(const AtomicString&) const; 122 int emphasisMarkHeight(const AtomicString&) const; 123 124 const SimpleFontData* primaryFont() const; 125 const FontData* fontDataAt(unsigned) const; 126 inline GlyphData glyphDataForCharacter(UChar32& c, bool mirror, bool spaceNormalize = false, FontDataVariant variant = AutoVariant) const 127 { 128 return glyphDataAndPageForCharacter(c, mirror, spaceNormalize, variant).first; 129 } 130 #if OS(MACOSX) 131 const SimpleFontData* fontDataForCombiningCharacterSequence(const UChar*, size_t length, FontDataVariant) const; 132 #endif 133 std::pair<GlyphData, GlyphPage*> glyphDataAndPageForCharacter(UChar32&, bool mirror, bool normalizeSpace = false, FontDataVariant = AutoVariant) const; 134 bool primaryFontHasGlyphForCharacter(UChar32) const; 135 136 CodePath codePath(const TextRun&) const; 137 138 PassTextBlobPtr buildTextBlob(const TextRunPaintInfo&, const FloatPoint& textOrigin, bool couldUseLCDRenderedText, CustomFontNotReadyAction = DoNotPaintIfFontNotReady) const; 139 void drawTextBlob(GraphicsContext*, const SkTextBlob*, const SkPoint& origin) const; 140 141 private: 142 enum ForTextEmphasisOrNot { NotForTextEmphasis, ForTextEmphasis }; 143 144 // Returns the initial in-stream advance. 145 float getGlyphsAndAdvancesForSimpleText(const TextRunPaintInfo&, GlyphBuffer&, ForTextEmphasisOrNot = NotForTextEmphasis) const; 146 float drawSimpleText(GraphicsContext*, const TextRunPaintInfo&, const FloatPoint&) const; 147 void drawEmphasisMarksForSimpleText(GraphicsContext*, const TextRunPaintInfo&, const AtomicString& mark, const FloatPoint&) const; 148 void drawGlyphs(GraphicsContext*, const SimpleFontData*, const GlyphBuffer&, unsigned from, unsigned numGlyphs, const FloatPoint&, const FloatRect& textRect) const; 149 float drawGlyphBuffer(GraphicsContext*, const TextRunPaintInfo&, const GlyphBuffer&, const FloatPoint&) const; 150 void drawEmphasisMarks(GraphicsContext*, const TextRunPaintInfo&, const GlyphBuffer&, const AtomicString&, const FloatPoint&) const; 151 float floatWidthForSimpleText(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, IntRectExtent* glyphBounds = 0) const; 152 int offsetForPositionForSimpleText(const TextRun&, float position, bool includePartialGlyphs) const; 153 FloatRect selectionRectForSimpleText(const TextRun&, const FloatPoint&, int h, int from, int to, bool accountForGlyphBounds) const; 154 155 bool getEmphasisMarkGlyphData(const AtomicString&, GlyphData&) const; 156 157 // Returns the initial in-stream advance. 158 float getGlyphsAndAdvancesForComplexText(const TextRunPaintInfo&, GlyphBuffer&, ForTextEmphasisOrNot = NotForTextEmphasis) const; 159 float drawComplexText(GraphicsContext*, const TextRunPaintInfo&, const FloatPoint&) const; 160 void drawEmphasisMarksForComplexText(GraphicsContext*, const TextRunPaintInfo&, const AtomicString& mark, const FloatPoint&) const; 161 float floatWidthForComplexText(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts, IntRectExtent* glyphBounds) const; 162 int offsetForPositionForComplexText(const TextRun&, float position, bool includePartialGlyphs) const; 163 FloatRect selectionRectForComplexText(const TextRun&, const FloatPoint&, int h, int from, int to) const; 164 165 PassTextBlobPtr buildTextBlobForSimpleText(const TextRunPaintInfo&, const FloatPoint& textOrigin, bool couldUseLCDRenderedText) const; 166 PassTextBlobPtr buildTextBlob(const GlyphBuffer&, float initialAdvance, const FloatRect& bounds, float& advance, bool couldUseLCD) const; 167 168 friend struct WidthIterator; 169 friend class SVGTextRunRenderingContext; 170 171 public: 172 // Useful for debugging the different font rendering code paths. 173 static void setCodePath(CodePath); 174 static CodePath codePath(); 175 static CodePath s_codePath; 176 177 FontSelector* fontSelector() const; 178 179 FontFallbackList* fontList() const { return m_fontFallbackList.get(); } 180 181 void willUseFontData(UChar32) const; 182 183 static FloatRect pixelSnappedSelectionRect(float fromX, float toX, float y, float height); 184 private: 185 bool loadingCustomFonts() const 186 { 187 return m_fontFallbackList && m_fontFallbackList->loadingCustomFonts(); 188 } 189 190 bool shouldSkipDrawing() const 191 { 192 return m_fontFallbackList && m_fontFallbackList->shouldSkipDrawing(); 193 } 194 195 FontDescription m_fontDescription; 196 mutable RefPtr<FontFallbackList> m_fontFallbackList; 197 }; 198 199 inline Font::~Font() 200 { 201 } 202 203 inline const SimpleFontData* Font::primaryFont() const 204 { 205 ASSERT(m_fontFallbackList); 206 return m_fontFallbackList->primarySimpleFontData(m_fontDescription); 207 } 208 209 inline const FontData* Font::fontDataAt(unsigned index) const 210 { 211 ASSERT(m_fontFallbackList); 212 return m_fontFallbackList->fontDataAt(m_fontDescription, index); 213 } 214 215 inline bool Font::isFixedPitch() const 216 { 217 ASSERT(m_fontFallbackList); 218 return m_fontFallbackList->isFixedPitch(m_fontDescription); 219 } 220 221 inline FontSelector* Font::fontSelector() const 222 { 223 return m_fontFallbackList ? m_fontFallbackList->fontSelector() : 0; 224 } 225 226 inline float Font::tabWidth(const SimpleFontData& fontData, unsigned tabSize, float position) const 227 { 228 if (!tabSize) 229 return fontDescription().letterSpacing(); 230 float tabWidth = tabSize * fontData.spaceWidth() + fontDescription().letterSpacing(); 231 return tabWidth - fmodf(position, tabWidth); 232 } 233 234 } // namespace blink 235 236 #endif 237
