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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 "FontBaseline.h"
28 #include "FontData.h"
29 #include "FontMetrics.h"
30 #include "FontPlatformData.h"
31 #include "FloatRect.h"
32 #include "GlyphMetricsMap.h"
33 #include "GlyphPageTreeNode.h"
34 #include "TypesettingFeatures.h"
35 #include <wtf/OwnPtr.h>
36 #include <wtf/PassOwnPtr.h>
37 
38 #if USE(ATSUI)
39 typedef struct OpaqueATSUStyle* ATSUStyle;
40 #endif
41 
42 #if PLATFORM(MAC) || USE(CORE_TEXT)
43 #include <wtf/RetainPtr.h>
44 #endif
45 
46 #if (PLATFORM(WIN) && !OS(WINCE)) \
47     || (OS(WINDOWS) && PLATFORM(WX))
48 #include <usp10.h>
49 #endif
50 
51 #if USE(CAIRO)
52 #include <cairo.h>
53 #endif
54 
55 #if PLATFORM(QT)
56 #include <QFont>
57 #endif
58 
59 #if PLATFORM(HAIKU)
60 #include <Font.h>
61 #endif
62 
63 namespace WebCore {
64 
65 class FontDescription;
66 class SharedBuffer;
67 class SVGFontData;
68 
69 enum FontDataVariant { AutoVariant, NormalVariant, SmallCapsVariant, EmphasisMarkVariant };
70 enum Pitch { UnknownPitch, FixedPitch, VariablePitch };
71 
72 class SimpleFontData : public FontData {
73 public:
74     SimpleFontData(const FontPlatformData&, bool isCustomFont = false, bool isLoading = false, bool isTextOrientationFallback = false);
75 #if ENABLE(SVG_FONTS)
76     SimpleFontData(PassOwnPtr<SVGFontData>, int size, bool syntheticBold, bool syntheticItalic);
77 #endif
78     virtual ~SimpleFontData();
79 
platformData()80     const FontPlatformData& platformData() const { return m_platformData; }
81 
82     SimpleFontData* smallCapsFontData(const FontDescription&) const;
83     SimpleFontData* emphasisMarkFontData(const FontDescription&) const;
84 
variantFontData(const FontDescription & description,FontDataVariant variant)85     SimpleFontData* variantFontData(const FontDescription& description, FontDataVariant variant) const
86     {
87         switch (variant) {
88         case SmallCapsVariant:
89             return smallCapsFontData(description);
90         case EmphasisMarkVariant:
91             return emphasisMarkFontData(description);
92         case AutoVariant:
93         case NormalVariant:
94             break;
95         }
96         ASSERT_NOT_REACHED();
97         return const_cast<SimpleFontData*>(this);
98     }
99 
100     SimpleFontData* verticalRightOrientationFontData() const;
101     SimpleFontData* uprightOrientationFontData() const;
102     SimpleFontData* brokenIdeographFontData() const;
103 
hasVerticalGlyphs()104     bool hasVerticalGlyphs() const { return m_hasVerticalGlyphs; }
isTextOrientationFallback()105     bool isTextOrientationFallback() const { return m_isTextOrientationFallback; }
106 
fontMetrics()107     const FontMetrics& fontMetrics() const { return m_fontMetrics; }
maxCharWidth()108     float maxCharWidth() const { return m_maxCharWidth; }
avgCharWidth()109     float avgCharWidth() const { return m_avgCharWidth; }
110 
111     FloatRect boundsForGlyph(Glyph) const;
112     float widthForGlyph(Glyph glyph) const;
113     FloatRect platformBoundsForGlyph(Glyph) const;
114     float platformWidthForGlyph(Glyph) const;
115 
spaceWidth()116     float spaceWidth() const { return m_spaceWidth; }
117 
118 #if USE(CG) || USE(CAIRO) || PLATFORM(WX) || USE(SKIA_ON_MAC_CHROME)
syntheticBoldOffset()119     float syntheticBoldOffset() const { return m_syntheticBoldOffset; }
120 #endif
121 
spaceGlyph()122     Glyph spaceGlyph() const { return m_spaceGlyph; }
isZeroWidthSpaceGlyph(Glyph glyph)123     bool isZeroWidthSpaceGlyph(Glyph glyph) const { return glyph == m_zeroWidthSpaceGlyph && glyph; }
124 
125     virtual const SimpleFontData* fontDataForCharacter(UChar32) const;
126     virtual bool containsCharacters(const UChar*, int length) const;
127 
128     void determinePitch();
pitch()129     Pitch pitch() const { return m_treatAsFixedPitch ? FixedPitch : VariablePitch; }
130 
131 #if ENABLE(SVG_FONTS)
svgFontData()132     SVGFontData* svgFontData() const { return m_svgFontData.get(); }
isSVGFont()133     bool isSVGFont() const { return m_svgFontData; }
134 #else
isSVGFont()135     bool isSVGFont() const { return false; }
136 #endif
137 
isCustomFont()138     virtual bool isCustomFont() const { return m_isCustomFont; }
isLoading()139     virtual bool isLoading() const { return m_isLoading; }
140     virtual bool isSegmented() const;
141 
missingGlyphData()142     const GlyphData& missingGlyphData() const { return m_missingGlyphData; }
143 
144 #ifndef NDEBUG
145     virtual String description() const;
146 #endif
147 
148 #if PLATFORM(MAC) || (PLATFORM(CHROMIUM) && OS(DARWIN))
getNSFont()149     NSFont* getNSFont() const { return m_platformData.font(); }
150 #elif (PLATFORM(WX) && OS(DARWIN))
getNSFont()151     NSFont* getNSFont() const { return m_platformData.nsFont(); }
152 #endif
153 
154 #if PLATFORM(MAC) || USE(CORE_TEXT)
155     CFDictionaryRef getCFStringAttributes(TypesettingFeatures, FontOrientation) const;
156 #endif
157 
158 #if USE(ATSUI)
159     void checkShapesArabic() const;
shapesArabic()160     bool shapesArabic() const
161     {
162         if (!m_checkedShapesArabic)
163             checkShapesArabic();
164         return m_shapesArabic;
165     }
166 #endif
167 
168 #if PLATFORM(QT)
getQtFont()169     QFont getQtFont() const { return m_platformData.font(); }
170 #endif
171 
172 #if PLATFORM(WIN) || (OS(WINDOWS) && PLATFORM(WX))
isSystemFont()173     bool isSystemFont() const { return m_isSystemFont; }
174 #if !OS(WINCE) // disable unused members to save space
175     SCRIPT_FONTPROPERTIES* scriptFontProperties() const;
scriptCache()176     SCRIPT_CACHE* scriptCache() const { return &m_scriptCache; }
177 #endif
178     static void setShouldApplyMacAscentHack(bool);
179     static bool shouldApplyMacAscentHack();
180 #endif
181 
182 #if PLATFORM(WX)
getWxFont()183     wxFont* getWxFont() const { return m_platformData.font(); }
184 #endif
185 
186 private:
187     void platformInit();
188     void platformGlyphInit();
189     void platformCharWidthInit();
190     void platformDestroy();
191 
192     void initCharWidths();
193 
194     void commonInit();
195 
196     SimpleFontData* scaledFontData(const FontDescription&, float scaleFactor) const;
197 
198 #if (PLATFORM(WIN) && !OS(WINCE)) \
199     || (OS(WINDOWS) && PLATFORM(WX))
200     void initGDIFont();
201     void platformCommonDestroy();
202     FloatRect boundsForGDIGlyph(Glyph glyph) const;
203     float widthForGDIGlyph(Glyph glyph) const;
204 #endif
205 
206     FontMetrics m_fontMetrics;
207     float m_maxCharWidth;
208     float m_avgCharWidth;
209 
210     FontPlatformData m_platformData;
211 
212     mutable OwnPtr<GlyphMetricsMap<FloatRect> > m_glyphToBoundsMap;
213     mutable GlyphMetricsMap<float> m_glyphToWidthMap;
214 
215     bool m_treatAsFixedPitch;
216 
217 #if ENABLE(SVG_FONTS)
218     OwnPtr<SVGFontData> m_svgFontData;
219 #endif
220 
221     bool m_isCustomFont;  // Whether or not we are custom font loaded via @font-face
222     bool m_isLoading; // Whether or not this custom font is still in the act of loading.
223 
224     bool m_isTextOrientationFallback;
225     bool m_isBrokenIdeographFallback;
226     bool m_hasVerticalGlyphs;
227 
228     Glyph m_spaceGlyph;
229     float m_spaceWidth;
230 
231     Glyph m_zeroWidthSpaceGlyph;
232 
233     GlyphData m_missingGlyphData;
234 
235     struct DerivedFontData {
236         static PassOwnPtr<DerivedFontData> create(bool forCustomFont);
237         ~DerivedFontData();
238 
239         bool forCustomFont;
240         OwnPtr<SimpleFontData> smallCaps;
241         OwnPtr<SimpleFontData> emphasisMark;
242         OwnPtr<SimpleFontData> brokenIdeograph;
243         OwnPtr<SimpleFontData> verticalRightOrientation;
244         OwnPtr<SimpleFontData> uprightOrientation;
245 
246     private:
DerivedFontDataDerivedFontData247         DerivedFontData(bool custom)
248             : forCustomFont(custom)
249         {
250         }
251     };
252 
253     mutable OwnPtr<DerivedFontData> m_derivedFontData;
254 
255 #if USE(CG) || USE(CAIRO) || PLATFORM(WX) || USE(SKIA_ON_MAC_CHROME)
256     float m_syntheticBoldOffset;
257 #endif
258 
259 #ifdef BUILDING_ON_TIGER
260 public:
261     void* m_styleGroup;
262 
263 private:
264 #endif
265 
266 #if USE(ATSUI)
267 public:
268     mutable HashMap<unsigned, ATSUStyle> m_ATSUStyleMap;
269     mutable bool m_ATSUMirrors;
270     mutable bool m_checkedShapesArabic;
271     mutable bool m_shapesArabic;
272 
273 private:
274 #endif
275 
276 #if PLATFORM(MAC) || USE(CORE_TEXT)
277     mutable HashMap<unsigned, RetainPtr<CFDictionaryRef> > m_CFStringAttributes;
278 #endif
279 
280 #if PLATFORM(WIN) || (OS(WINDOWS) && PLATFORM(WX))
281     bool m_isSystemFont;
282 #if !OS(WINCE) // disable unused members to save space
283     mutable SCRIPT_CACHE m_scriptCache;
284     mutable SCRIPT_FONTPROPERTIES* m_scriptFontProperties;
285 #endif
286 #endif
287 };
288 
289 
290 #if !PLATFORM(QT)
boundsForGlyph(Glyph glyph)291 ALWAYS_INLINE FloatRect SimpleFontData::boundsForGlyph(Glyph glyph) const
292 {
293     if (isZeroWidthSpaceGlyph(glyph))
294         return FloatRect();
295 
296     FloatRect bounds;
297     if (m_glyphToBoundsMap) {
298         bounds = m_glyphToBoundsMap->metricsForGlyph(glyph);
299         if (bounds.width() != cGlyphSizeUnknown)
300             return bounds;
301     }
302 
303     bounds = platformBoundsForGlyph(glyph);
304     if (!m_glyphToBoundsMap)
305         m_glyphToBoundsMap = adoptPtr(new GlyphMetricsMap<FloatRect>);
306     m_glyphToBoundsMap->setMetricsForGlyph(glyph, bounds);
307     return bounds;
308 }
309 
widthForGlyph(Glyph glyph)310 ALWAYS_INLINE float SimpleFontData::widthForGlyph(Glyph glyph) const
311 {
312     if (isZeroWidthSpaceGlyph(glyph))
313         return 0;
314 
315     float width = m_glyphToWidthMap.metricsForGlyph(glyph);
316     if (width != cGlyphSizeUnknown)
317         return width;
318 
319     width = platformWidthForGlyph(glyph);
320     m_glyphToWidthMap.setMetricsForGlyph(glyph, width);
321     return width;
322 }
323 #endif
324 
325 } // namespace WebCore
326 
327 #endif // SimpleFontData_h
328