2 * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
3 * (C) 2000 Antti Koivisto (koivisto@kde.org)
4 * (C) 2000 Dirk Mueller (mueller@kde.org)
5 * Copyright (C) 2003, 2006, 2007, 2010, 2011 Apple Inc. All rights reserved.
6 * Copyright (C) 2008 Holger Hans Peter Freyther
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.
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.
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.
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>
48 class FontPlatformData;
51 class GlyphPageTreeNode;
52 class GraphicsContext;
57 struct GlyphOverflow {
63 , computeBounds(false)
78 Font(const FontDescription&, short letterSpacing, short wordSpacing);
79 // This constructor is only used if the platform wants to start with a native font.
80 Font(const FontPlatformData&, bool isPrinting, FontSmoothingMode = AutoSmoothing);
84 Font& operator=(const Font&);
86 bool operator==(const Font& other) const;
87 bool operator!=(const Font& other) const { return !(*this == other); }
89 const FontDescription& fontDescription() const { return m_fontDescription; }
91 int pixelSize() const { return fontDescription().computedPixelSize(); }
92 float size() const { return fontDescription().computedSize(); }
94 void update(PassRefPtr<FontSelector>) const;
96 void drawText(GraphicsContext*, const TextRun&, const FloatPoint&, int from = 0, int to = -1) const;
97 void drawEmphasisMarks(GraphicsContext*, const TextRun&, const AtomicString& mark, const FloatPoint&, int from = 0, int to = -1) const;
99 float width(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;
100 float width(const TextRun&, int& charsConsumed, String& glyphName) const;
102 int offsetForPosition(const TextRun&, float position, bool includePartialGlyphs) const;
103 FloatRect selectionRectForText(const TextRun&, const FloatPoint&, int h, int from = 0, int to = -1) const;
105 bool isSmallCaps() const { return m_fontDescription.smallCaps(); }
107 short wordSpacing() const { return m_wordSpacing; }
108 short letterSpacing() const { return m_letterSpacing; }
109 void setWordSpacing(short s) { m_wordSpacing = s; }
110 void setLetterSpacing(short s) { m_letterSpacing = s; }
111 bool isFixedPitch() const;
112 bool isPrinterFont() const { return m_fontDescription.usePrinterFont(); }
114 FontRenderingMode renderingMode() const { return m_fontDescription.renderingMode(); }
116 TypesettingFeatures typesettingFeatures() const
118 TextRenderingMode textRenderingMode = m_fontDescription.textRenderingMode();
119 return textRenderingMode == OptimizeLegibility || textRenderingMode == GeometricPrecision ? Kerning | Ligatures : 0;
122 FontFamily& firstFamily() { return m_fontDescription.firstFamily(); }
123 const FontFamily& family() const { return m_fontDescription.family(); }
125 FontItalic italic() const { return m_fontDescription.italic(); }
126 FontWeight weight() const { return m_fontDescription.weight(); }
127 FontWidthVariant widthVariant() const { return m_fontDescription.widthVariant(); }
129 bool isPlatformFont() const { return m_isPlatformFont; }
131 // Metrics that we query the FontFallbackList for.
132 const FontMetrics& fontMetrics() const { return primaryFont()->fontMetrics(); }
133 float spaceWidth() const { return primaryFont()->spaceWidth() + m_letterSpacing; }
134 float tabWidth(const SimpleFontData& fontData) const { return 8 * fontData.spaceWidth() + letterSpacing(); }
135 int emphasisMarkAscent(const AtomicString&) const;
136 int emphasisMarkDescent(const AtomicString&) const;
137 int emphasisMarkHeight(const AtomicString&) const;
139 const SimpleFontData* primaryFont() const;
140 const FontData* fontDataAt(unsigned) const;
141 GlyphData glyphDataForCharacter(UChar32, bool mirror, FontDataVariant = AutoVariant) const;
142 std::pair<GlyphData, GlyphPage*> glyphDataAndPageForCharacter(UChar32, bool mirror, FontDataVariant = AutoVariant) const;
143 bool primaryFontHasGlyphForCharacter(UChar32) const;
145 static bool isCJKIdeograph(UChar32);
146 static bool isCJKIdeographOrSymbol(UChar32);
148 static unsigned expansionOpportunityCount(const UChar*, size_t length, TextDirection, bool& isAfterExpansion);
154 static void setShouldUseSmoothing(bool);
155 static bool shouldUseSmoothing();
157 enum CodePath { Auto, Simple, Complex, SimpleWithGlyphOverflow };
160 enum ForTextEmphasisOrNot { NotForTextEmphasis, ForTextEmphasis };
162 // Returns the initial in-stream advance.
163 float getGlyphsAndAdvancesForSimpleText(const TextRun&, int from, int to, GlyphBuffer&, ForTextEmphasisOrNot = NotForTextEmphasis) const;
164 void drawSimpleText(GraphicsContext*, const TextRun&, const FloatPoint&, int from, int to) const;
165 void drawEmphasisMarksForSimpleText(GraphicsContext*, const TextRun&, const AtomicString& mark, const FloatPoint&, int from, int to) const;
166 void drawGlyphs(GraphicsContext*, const SimpleFontData*, const GlyphBuffer&, int from, int to, const FloatPoint&) const;
167 void drawGlyphBuffer(GraphicsContext*, const TextRun&, const GlyphBuffer&, const FloatPoint&) const;
168 void drawEmphasisMarks(GraphicsContext*, const TextRun&, const GlyphBuffer&, const AtomicString&, const FloatPoint&) const;
169 float floatWidthForSimpleText(const TextRun&, GlyphBuffer*, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;
170 int offsetForPositionForSimpleText(const TextRun&, float position, bool includePartialGlyphs) const;
171 FloatRect selectionRectForSimpleText(const TextRun&, const FloatPoint&, int h, int from, int to) const;
173 bool getEmphasisMarkGlyphData(const AtomicString&, GlyphData&) const;
175 static bool canReturnFallbackFontsForComplexText();
176 static bool canExpandAroundIdeographsInComplexText();
178 CodePath codePath(const TextRun&) const;
180 // Returns the initial in-stream advance.
181 float getGlyphsAndAdvancesForComplexText(const TextRun&, int from, int to, GlyphBuffer&, ForTextEmphasisOrNot = NotForTextEmphasis) const;
182 void drawComplexText(GraphicsContext*, const TextRun&, const FloatPoint&, int from, int to) const;
183 void drawEmphasisMarksForComplexText(GraphicsContext*, const TextRun&, const AtomicString& mark, const FloatPoint&, int from, int to) const;
184 float floatWidthForComplexText(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;
185 int offsetForPositionForComplexText(const TextRun&, float position, bool includePartialGlyphs) const;
186 FloatRect selectionRectForComplexText(const TextRun&, const FloatPoint&, int h, int from, int to) const;
188 friend struct WidthIterator;
189 friend class SVGTextRunRenderingContext;
192 // Useful for debugging the different font rendering code paths.
193 static void setCodePath(CodePath);
194 static CodePath codePath();
195 static CodePath s_codePath;
197 static const uint8_t s_roundingHackCharacterTable[256];
198 static bool isRoundingHackCharacter(UChar32 c)
200 return !(c & ~0xFF) && s_roundingHackCharacterTable[c];
203 FontSelector* fontSelector() const;
204 static bool treatAsSpace(UChar c) { return c == ' ' || c == '\t' || c == '\n' || c == noBreakSpace; }
205 static bool treatAsZeroWidthSpace(UChar c) { return treatAsZeroWidthSpaceInComplexScript(c) || c == 0x200c || c == 0x200d; }
206 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; }
207 static bool canReceiveTextEmphasis(UChar32 c);
209 static inline UChar normalizeSpaces(UChar character)
211 if (treatAsSpace(character))
214 if (treatAsZeroWidthSpace(character))
215 return zeroWidthSpace;
220 static String normalizeSpaces(const UChar*, unsigned length);
222 bool needsTranscoding() const { return m_needsTranscoding; }
223 FontFallbackList* fontList() const { return m_fontList.get(); }
226 bool loadingCustomFonts() const
228 return m_fontList && m_fontList->loadingCustomFonts();
231 FontDescription m_fontDescription;
232 mutable RefPtr<FontFallbackList> m_fontList;
233 short m_letterSpacing;
235 bool m_isPlatformFont;
236 bool m_needsTranscoding;
243 inline const SimpleFontData* Font::primaryFont() const
246 return m_fontList->primarySimpleFontData(this);
249 inline const FontData* Font::fontDataAt(unsigned index) const
252 return m_fontList->fontDataAt(this, index);
255 inline bool Font::isFixedPitch() const
258 return m_fontList->isFixedPitch(this);
261 inline FontSelector* Font::fontSelector() const
263 return m_fontList ? m_fontList->fontSelector() : 0;