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/GlyphBuffer.h"
34 #include "platform/fonts/GlyphMetricsMap.h"
35 #include "platform/fonts/GlyphPageTreeNode.h"
36 #include "platform/fonts/TypesettingFeatures.h"
37 #include "platform/fonts/opentype/OpenTypeVerticalData.h"
38 #include "platform/geometry/FloatRect.h"
39 #include "wtf/OwnPtr.h"
40 #include "wtf/PassOwnPtr.h"
41 #include "wtf/text/StringHash.h"
42
43 #if OS(MACOSX)
44 #include "wtf/RetainPtr.h"
45 #endif
46
47 namespace WebCore {
48
49 class CSSFontFaceSource;
50 class FontDescription;
51 class SharedBuffer;
52 struct WidthIterator;
53
54 enum FontDataVariant { AutoVariant, NormalVariant, SmallCapsVariant, EmphasisMarkVariant, BrokenIdeographVariant };
55 enum Pitch { UnknownPitch, FixedPitch, VariablePitch };
56
57 class PLATFORM_EXPORT SimpleFontData : public FontData {
58 public:
59 // Used to create platform fonts.
60 static PassRefPtr<SimpleFontData> create(const FontPlatformData& platformData, PassRefPtr<CustomFontData> customData = 0, bool isTextOrientationFallback = false)
61 {
62 return adoptRef(new SimpleFontData(platformData, customData, isTextOrientationFallback));
63 }
64
65 // Used to create SVG Fonts.
create(PassRefPtr<CustomFontData> customData,float fontSize,bool syntheticBold,bool syntheticItalic)66 static PassRefPtr<SimpleFontData> create(PassRefPtr<CustomFontData> customData, float fontSize, bool syntheticBold, bool syntheticItalic)
67 {
68 return adoptRef(new SimpleFontData(customData, fontSize, syntheticBold, syntheticItalic));
69 }
70
71 virtual ~SimpleFontData();
72
systemFallback()73 static const SimpleFontData* systemFallback() { return reinterpret_cast<const SimpleFontData*>(-1); }
74
platformData()75 const FontPlatformData& platformData() const { return m_platformData; }
76 #if ENABLE(OPENTYPE_VERTICAL)
verticalData()77 const OpenTypeVerticalData* verticalData() const { return m_verticalData.get(); }
78 #endif
79
80 PassRefPtr<SimpleFontData> smallCapsFontData(const FontDescription&) const;
81 PassRefPtr<SimpleFontData> emphasisMarkFontData(const FontDescription&) const;
82 PassRefPtr<SimpleFontData> brokenIdeographFontData() const;
83
variantFontData(const FontDescription & description,FontDataVariant variant)84 PassRefPtr<SimpleFontData> variantFontData(const FontDescription& description, FontDataVariant variant) const
85 {
86 switch (variant) {
87 case SmallCapsVariant:
88 return smallCapsFontData(description);
89 case EmphasisMarkVariant:
90 return emphasisMarkFontData(description);
91 case BrokenIdeographVariant:
92 return brokenIdeographFontData();
93 case AutoVariant:
94 case NormalVariant:
95 break;
96 }
97 ASSERT_NOT_REACHED();
98 return const_cast<SimpleFontData*>(this);
99 }
100
101 PassRefPtr<SimpleFontData> verticalRightOrientationFontData() const;
102 PassRefPtr<SimpleFontData> uprightOrientationFontData() const;
103
hasVerticalGlyphs()104 bool hasVerticalGlyphs() const { return m_hasVerticalGlyphs; }
isTextOrientationFallback()105 bool isTextOrientationFallback() const { return m_isTextOrientationFallback; }
106
fontMetrics()107 FontMetrics& fontMetrics() { return m_fontMetrics; }
fontMetrics()108 const FontMetrics& fontMetrics() const { return m_fontMetrics; }
sizePerUnit()109 float sizePerUnit() const { return platformData().size() / (fontMetrics().unitsPerEm() ? fontMetrics().unitsPerEm() : 1); }
110
maxCharWidth()111 float maxCharWidth() const { return m_maxCharWidth; }
setMaxCharWidth(float maxCharWidth)112 void setMaxCharWidth(float maxCharWidth) { m_maxCharWidth = maxCharWidth; }
113
avgCharWidth()114 float avgCharWidth() const { return m_avgCharWidth; }
setAvgCharWidth(float avgCharWidth)115 void setAvgCharWidth(float avgCharWidth) { m_avgCharWidth = avgCharWidth; }
116
117 FloatRect boundsForGlyph(Glyph) const;
118 float widthForGlyph(Glyph glyph) const;
119 FloatRect platformBoundsForGlyph(Glyph) const;
120 float platformWidthForGlyph(Glyph) const;
121
spaceWidth()122 float spaceWidth() const { return m_spaceWidth; }
adjustedSpaceWidth()123 float adjustedSpaceWidth() const { return m_adjustedSpaceWidth; }
setSpaceWidth(float spaceWidth)124 void setSpaceWidth(float spaceWidth) { m_spaceWidth = spaceWidth; }
125
126 #if OS(MACOSX)
syntheticBoldOffset()127 float syntheticBoldOffset() const { return m_syntheticBoldOffset; }
128 #endif
129
spaceGlyph()130 Glyph spaceGlyph() const { return m_spaceGlyph; }
setSpaceGlyph(Glyph spaceGlyph)131 void setSpaceGlyph(Glyph spaceGlyph) { m_spaceGlyph = spaceGlyph; }
zeroWidthSpaceGlyph()132 Glyph zeroWidthSpaceGlyph() const { return m_zeroWidthSpaceGlyph; }
setZeroWidthSpaceGlyph(Glyph spaceGlyph)133 void setZeroWidthSpaceGlyph(Glyph spaceGlyph) { m_zeroWidthSpaceGlyph = spaceGlyph; }
isZeroWidthSpaceGlyph(Glyph glyph)134 bool isZeroWidthSpaceGlyph(Glyph glyph) const { return glyph == m_zeroWidthSpaceGlyph && glyph; }
zeroGlyph()135 Glyph zeroGlyph() const { return m_zeroGlyph; }
setZeroGlyph(Glyph zeroGlyph)136 void setZeroGlyph(Glyph zeroGlyph) { m_zeroGlyph = zeroGlyph; }
137
138 virtual const SimpleFontData* fontDataForCharacter(UChar32) const OVERRIDE;
139 virtual bool containsCharacters(const UChar*, int length) const OVERRIDE;
140
141 Glyph glyphForCharacter(UChar32) const;
142
143 void determinePitch();
pitch()144 Pitch pitch() const { return m_treatAsFixedPitch ? FixedPitch : VariablePitch; }
145
isSVGFont()146 bool isSVGFont() const { return m_customFontData && m_customFontData->isSVGFont(); }
isCustomFont()147 virtual bool isCustomFont() const OVERRIDE { return m_customFontData; }
isLoading()148 virtual bool isLoading() const OVERRIDE { return m_customFontData ? m_customFontData->isLoading() : false; }
isLoadingFallback()149 virtual bool isLoadingFallback() const OVERRIDE { return m_customFontData ? m_customFontData->isLoadingFallback() : false; }
150 virtual bool isSegmented() const OVERRIDE;
151
missingGlyphData()152 const GlyphData& missingGlyphData() const { return m_missingGlyphData; }
setMissingGlyphData(const GlyphData & glyphData)153 void setMissingGlyphData(const GlyphData& glyphData) { m_missingGlyphData = glyphData; }
154
155 #ifndef NDEBUG
156 virtual String description() const;
157 #endif
158
159 #if OS(MACOSX)
160 const SimpleFontData* getCompositeFontReferenceFontData(NSFont *key) const;
getNSFont()161 NSFont* getNSFont() const { return m_platformData.font(); }
162 #endif
163
164 #if OS(MACOSX)
165 CFDictionaryRef getCFStringAttributes(TypesettingFeatures, FontOrientation) const;
166 #endif
167
168 #if OS(MACOSX) || USE(HARFBUZZ)
169 bool canRenderCombiningCharacterSequence(const UChar*, size_t) const;
170 #endif
171
applyTransforms(GlyphBufferGlyph *,GlyphBufferAdvance *,size_t,TypesettingFeatures)172 bool applyTransforms(GlyphBufferGlyph*, GlyphBufferAdvance*, size_t, TypesettingFeatures) const
173 {
174 return false;
175 }
176
customFontData()177 PassRefPtr<CustomFontData> customFontData() const { return m_customFontData; }
178
179 private:
180 SimpleFontData(const FontPlatformData&, PassRefPtr<CustomFontData> customData, bool isTextOrientationFallback = false);
181
182 SimpleFontData(PassRefPtr<CustomFontData> customData, float fontSize, bool syntheticBold, bool syntheticItalic);
183
184 void platformInit();
185 void platformGlyphInit();
186 void platformCharWidthInit();
187 void platformDestroy();
188
189 void initCharWidths();
190
191 PassRefPtr<SimpleFontData> createScaledFontData(const FontDescription&, float scaleFactor) const;
192 PassRefPtr<SimpleFontData> platformCreateScaledFontData(const FontDescription&, float scaleFactor) const;
193
194 FontMetrics m_fontMetrics;
195 float m_maxCharWidth;
196 float m_avgCharWidth;
197
198 FontPlatformData m_platformData;
199
200 mutable OwnPtr<GlyphMetricsMap<FloatRect> > m_glyphToBoundsMap;
201 mutable GlyphMetricsMap<float> m_glyphToWidthMap;
202
203 bool m_treatAsFixedPitch;
204
205 bool m_isTextOrientationFallback;
206 bool m_isBrokenIdeographFallback;
207 #if ENABLE(OPENTYPE_VERTICAL)
208 RefPtr<OpenTypeVerticalData> m_verticalData;
209 #endif
210 bool m_hasVerticalGlyphs;
211
212 Glyph m_spaceGlyph;
213 float m_spaceWidth;
214 Glyph m_zeroGlyph;
215 float m_adjustedSpaceWidth;
216
217 Glyph m_zeroWidthSpaceGlyph;
218
219 GlyphData m_missingGlyphData;
220
221 struct DerivedFontData {
222 static PassOwnPtr<DerivedFontData> create(bool forCustomFont);
223 ~DerivedFontData();
224
225 bool forCustomFont;
226 RefPtr<SimpleFontData> smallCaps;
227 RefPtr<SimpleFontData> emphasisMark;
228 RefPtr<SimpleFontData> brokenIdeograph;
229 RefPtr<SimpleFontData> verticalRightOrientation;
230 RefPtr<SimpleFontData> uprightOrientation;
231 #if OS(MACOSX)
232 mutable RetainPtr<CFMutableDictionaryRef> compositeFontReferences;
233 #endif
234
235 private:
DerivedFontDataDerivedFontData236 DerivedFontData(bool custom)
237 : forCustomFont(custom)
238 {
239 }
240 };
241
242 mutable OwnPtr<DerivedFontData> m_derivedFontData;
243
244 RefPtr<CustomFontData> m_customFontData;
245
246 #if OS(MACOSX)
247 float m_syntheticBoldOffset;
248
249 mutable HashMap<unsigned, RetainPtr<CFDictionaryRef> > m_CFStringAttributes;
250 #endif
251
252 #if OS(MACOSX) || USE(HARFBUZZ)
253 mutable OwnPtr<HashMap<String, bool> > m_combiningCharacterSequenceSupport;
254 #endif
255 };
256
boundsForGlyph(Glyph glyph)257 ALWAYS_INLINE FloatRect SimpleFontData::boundsForGlyph(Glyph glyph) const
258 {
259 if (isZeroWidthSpaceGlyph(glyph))
260 return FloatRect();
261
262 FloatRect bounds;
263 if (m_glyphToBoundsMap) {
264 bounds = m_glyphToBoundsMap->metricsForGlyph(glyph);
265 if (bounds.width() != cGlyphSizeUnknown)
266 return bounds;
267 }
268
269 bounds = platformBoundsForGlyph(glyph);
270 if (!m_glyphToBoundsMap)
271 m_glyphToBoundsMap = adoptPtr(new GlyphMetricsMap<FloatRect>);
272 m_glyphToBoundsMap->setMetricsForGlyph(glyph, bounds);
273 return bounds;
274 }
275
widthForGlyph(Glyph glyph)276 ALWAYS_INLINE float SimpleFontData::widthForGlyph(Glyph glyph) const
277 {
278 if (isZeroWidthSpaceGlyph(glyph))
279 return 0;
280
281 float width = m_glyphToWidthMap.metricsForGlyph(glyph);
282 if (width != cGlyphSizeUnknown)
283 return width;
284
285 if (isSVGFont())
286 width = m_customFontData->widthForSVGGlyph(glyph, m_platformData.size());
287 #if ENABLE(OPENTYPE_VERTICAL)
288 else if (m_verticalData)
289 #if OS(MACOSX)
290 width = m_verticalData->advanceHeight(this, glyph) + m_syntheticBoldOffset;
291 #else
292 width = m_verticalData->advanceHeight(this, glyph);
293 #endif
294 #endif
295 else
296 width = platformWidthForGlyph(glyph);
297
298 m_glyphToWidthMap.setMetricsForGlyph(glyph, width);
299 return width;
300 }
301
302 } // namespace WebCore
303 #endif // SimpleFontData_h
304