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1 /* | |
2 * Copyright 2014 Google Inc. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license that can be | |
5 * found in the LICENSE file. | |
6 */ | |
7 | |
8 #include "SkFontConfigParser_android.h" | |
9 #include "SkFontDescriptor.h" | |
10 #include "SkFontHost_FreeType_common.h" | |
11 #include "SkFontMgr.h" | |
12 #include "SkFontStyle.h" | |
13 #include "SkStream.h" | |
14 #include "SkTDArray.h" | |
15 #include "SkTSearch.h" | |
16 #include "SkTypeface.h" | |
17 #include "SkTypefaceCache.h" | |
18 | |
19 #include <limits> | |
20 #include <stdlib.h> | |
21 | |
22 #ifndef SK_DEBUG_FONTS | |
23 #define SK_DEBUG_FONTS 0 | |
24 #endif | |
25 | |
26 #if SK_DEBUG_FONTS | |
27 #define DEBUG_FONT(args) SkDebugf args | |
28 #else | |
29 #define DEBUG_FONT(args) | |
30 #endif | |
31 | |
32 class SkTypeface_Android : public SkTypeface_FreeType { | |
33 public: | |
34 SkTypeface_Android(int index, | |
35 Style style, | |
36 bool isFixedPitch, | |
37 const SkString familyName) | |
38 : INHERITED(style, SkTypefaceCache::NewFontID(), isFixedPitch) | |
39 , fIndex(index) | |
40 , fFamilyName(familyName) | |
41 { } | |
42 | |
43 const SkString& name() const { return fFamilyName; } | |
44 | |
45 protected: | |
46 int fIndex; | |
47 SkString fFamilyName; | |
48 | |
49 private: | |
50 typedef SkTypeface_FreeType INHERITED; | |
51 }; | |
52 | |
53 class SkTypeface_AndroidSystem : public SkTypeface_Android { | |
54 public: | |
55 SkTypeface_AndroidSystem(const SkString pathName, | |
56 int index, | |
57 Style style, | |
58 bool isFixedPitch, | |
59 const SkString familyName) | |
60 : INHERITED(index, style, isFixedPitch, familyName) | |
61 , fPathName(pathName) | |
62 { } | |
63 | |
64 void onGetFontDescriptor(SkFontDescriptor* desc, bool* serialize) const SK_O VERRIDE { | |
djsollen
2014/07/22 18:18:29
virtual?
bungeman-skia
2014/07/22 18:48:16
Done.
| |
65 SkASSERT(desc); | |
66 SkASSERT(serialize); | |
67 desc->setFamilyName(fFamilyName.c_str()); | |
68 desc->setFontFileName(fPathName.c_str()); | |
69 *serialize = false; | |
70 } | |
71 SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE { | |
72 *ttcIndex = fIndex; | |
73 // On Android, system fonts are installed on the device; the XML catalog s | |
djsollen
2014/07/22 18:18:29
remove the comment
bungeman-skia
2014/07/22 18:48:16
Done.
| |
74 // are read by SkFontConfigParser_android. We can't safely duplicate() | |
75 // them, so re-open them every time we need a fresh stream | |
76 return SkStream::NewFromFile(fPathName.c_str()); | |
77 } | |
78 | |
79 private: | |
80 SkString fPathName; | |
81 | |
82 typedef SkTypeface_Android INHERITED; | |
83 }; | |
84 | |
85 class SkTypeface_AndroidStream : public SkTypeface_Android { | |
86 public: | |
87 SkTypeface_AndroidStream(SkStream* stream, | |
88 int index, | |
89 Style style, | |
90 bool isFixedPitch, | |
91 const SkString familyName) | |
92 : INHERITED(index, style, isFixedPitch, familyName) | |
93 , fStream(stream) | |
94 { } | |
95 | |
96 void onGetFontDescriptor(SkFontDescriptor* desc, bool* serialize) const SK_O VERRIDE { | |
97 SkASSERT(desc); | |
98 SkASSERT(serialize); | |
99 desc->setFamilyName(fFamilyName.c_str()); | |
100 desc->setFontFileName(NULL); | |
101 *serialize = true; | |
102 } | |
103 | |
104 SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE { | |
105 *ttcIndex = fIndex; | |
106 return fStream->duplicate(); | |
107 } | |
108 | |
109 private: | |
110 SkAutoTUnref<SkStream> fStream; | |
111 | |
112 typedef SkTypeface_Android INHERITED; | |
113 }; | |
114 | |
115 namespace { | |
djsollen
2014/07/22 18:18:29
remove namespace
bungeman-skia
2014/07/22 18:48:16
Done.
| |
116 | |
117 #ifndef SK_FONT_FILE_PREFIX | |
118 #define SK_FONT_FILE_PREFIX "/fonts/" | |
119 #endif | |
120 | |
121 void get_path_for_sys_fonts(SkString* full, const SkString& name) { | |
122 full->set(getenv("ANDROID_ROOT")); | |
123 full->append(SK_FONT_FILE_PREFIX); | |
124 full->append(name); | |
125 } | |
126 | |
127 } | |
128 | |
129 class SkFontStyleSet_Android : public SkFontStyleSet { | |
130 public: | |
131 explicit SkFontStyleSet_Android(FontFamily* family) : fFontFamily(family) { | |
132 // TODO? make this lazy | |
133 for (int i = 0; i < family->fFontFiles.count(); ++i) { | |
134 const SkString& fileName = family->fFontFiles[i].fFileName; | |
135 | |
136 SkString pathName; | |
137 get_path_for_sys_fonts(&pathName, fileName); | |
138 | |
139 SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(pathName.c_str() )); | |
140 if (!stream.get()) { | |
141 DEBUG_FONT(("---- SystemFonts[%d] file=%s (NOT EXIST)", i, filen ame.c_str())); | |
142 continue; | |
143 } | |
144 | |
145 SkString fontName; | |
146 SkTypeface::Style style; | |
147 bool isFixedWidth; | |
148 if (!SkTypeface_FreeType::ScanFont(stream.get(), family->fFontFiles[ i].fIndex, | |
149 &fontName, &style, &isFixedWidth) ) | |
150 { | |
151 DEBUG_FONT(("---- SystemFonts[%d] file=%s (INVALID)", i, filenam e.c_str())); | |
152 continue; | |
153 } | |
154 | |
155 fStyles.push_back().reset(SkNEW_ARGS(SkTypeface_AndroidSystem, | |
156 (pathName, 0, | |
157 style, isFixedWidth, fontName) )); | |
158 } | |
159 } | |
160 | |
161 int count() SK_OVERRIDE { | |
162 return fStyles.count(); | |
163 } | |
164 void getStyle(int index, SkFontStyle* style, SkString* name) SK_OVERRIDE { | |
165 if (index < 0 || fStyles.count() <= index) { | |
166 return; | |
167 } | |
168 if (style) { | |
169 *style = this->style(index); | |
170 } | |
171 if (name) { | |
172 name->reset(); | |
173 } | |
174 } | |
175 SkTypeface* createTypeface(int index) SK_OVERRIDE { | |
176 if (index < 0 || fStyles.count() <= index) { | |
177 return NULL; | |
178 } | |
179 return SkRef(fStyles[index].get()); | |
180 } | |
181 | |
182 /** Find the typeface in this style set that most closely matches the given pattern. | |
183 * TODO: consider replacing with SkStyleSet_Indirect::matchStyle(); | |
184 * this simpler version using match_score() passes all our tests. | |
185 */ | |
186 SkTypeface* matchStyle(const SkFontStyle& pattern) SK_OVERRIDE { | |
187 if (0 == fStyles.count()) { | |
188 return NULL; | |
189 } | |
190 SkTypeface* closest = fStyles[0]; | |
191 int minScore = std::numeric_limits<int>::max(); | |
192 for (int i = 0; i < fStyles.count(); ++i) { | |
193 SkFontStyle style = this->style(i); | |
194 int score = match_score(pattern, style); | |
195 if (score < minScore) { | |
196 closest = fStyles[i]; | |
197 minScore = score; | |
198 } | |
199 } | |
200 return SkRef(closest); | |
201 } | |
202 | |
203 private: | |
204 SkFontStyle style(int index) { | |
205 return SkFontStyle(this->weight(index), SkFontStyle::kNormal_Width, | |
206 this->slant(index)); | |
207 } | |
208 SkFontStyle::Weight weight(int index) { | |
209 if (fStyles[index]->isBold()) return SkFontStyle::kBold_Weight; | |
210 return SkFontStyle::kNormal_Weight; | |
211 } | |
212 SkFontStyle::Slant slant(int index) { | |
213 if (fStyles[index]->isItalic()) return SkFontStyle::kItalic_Slant; | |
214 return SkFontStyle::kUpright_Slant; | |
215 } | |
216 static int match_score(const SkFontStyle& pattern, const SkFontStyle& candid ate) { | |
217 int score = 0; | |
218 score += abs((pattern.width() - candidate.width()) * 100); | |
219 score += abs((pattern.isItalic() == candidate.isItalic()) ? 0 : 1000); | |
220 score += abs(pattern.weight() - candidate.weight()); | |
221 return score; | |
222 } | |
223 | |
224 | |
225 FontFamily* fFontFamily; | |
226 SkTArray<SkAutoTUnref<SkTypeface>, true> fStyles; | |
227 | |
228 friend struct NameToFamily; | |
229 friend class SkFontMgr_Android; | |
230 | |
231 typedef SkFontStyleSet INHERITED; | |
232 }; | |
233 | |
234 /** On Android a single family can have many names, but our API assumes unique n ames. | |
235 * Map names to the back end so that all names for a given family refer to the same | |
236 * (non-replicated) set of typefaces. | |
237 * SkTDict<> doesn't let us do index-based lookup, so we write our own mapping. | |
238 */ | |
239 struct NameToFamily { | |
240 SkString name; | |
241 SkFontStyleSet_Android* styleSet; | |
242 }; | |
243 | |
244 class SkFontMgr_Android : public SkFontMgr { | |
245 public: | |
246 SkFontMgr_Android() { | |
247 SkTDArray<FontFamily*> fontFamilies; | |
248 SkFontConfigParser::GetFontFamilies(fontFamilies); | |
249 this->buildNameToFamilyMap(fontFamilies); | |
250 this->findDefaultFont(); | |
251 } | |
252 | |
253 protected: | |
254 /** Returns not how many families we have, but how many unique names | |
255 * exist among the families. | |
256 */ | |
257 virtual int onCountFamilies() const SK_OVERRIDE { | |
258 return fNameToFamilyMap.count(); | |
259 } | |
260 | |
261 virtual void onGetFamilyName(int index, SkString* familyName) const SK_OVERR IDE { | |
262 if (index < 0 || fNameToFamilyMap.count() <= index) { | |
263 familyName->reset(); | |
264 return; | |
265 } | |
266 familyName->set(fNameToFamilyMap[index].name); | |
267 } | |
268 | |
269 virtual SkFontStyleSet* onCreateStyleSet(int index) const SK_OVERRIDE { | |
270 if (index < 0 || fNameToFamilyMap.count() <= index) { | |
271 return NULL; | |
272 } | |
273 return SkRef(fNameToFamilyMap[index].styleSet); | |
274 } | |
275 | |
276 virtual SkFontStyleSet* onMatchFamily(const char familyName[]) const SK_OVER RIDE { | |
277 if (!familyName) { | |
278 return NULL; | |
279 } | |
280 SkAutoAsciiToLC tolc(familyName); | |
281 for (int i = 0; i < fNameToFamilyMap.count(); ++i) { | |
282 if (fNameToFamilyMap[i].name.equals(tolc.lc())) { | |
283 return SkRef(fNameToFamilyMap[i].styleSet); | |
284 } | |
285 } | |
286 return NULL; | |
287 } | |
288 | |
289 virtual SkTypeface* onMatchFamilyStyle(const char familyName[], | |
290 const SkFontStyle& style) const SK_OV ERRIDE { | |
291 SkAutoTUnref<SkFontStyleSet> sset(this->matchFamily(familyName)); | |
292 return sset->matchStyle(style); | |
293 } | |
294 | |
295 virtual SkTypeface* onMatchFaceStyle(const SkTypeface* typeface, | |
296 const SkFontStyle& style) const SK_OVER RIDE { | |
297 for (int i = 0; i < fFontStyleSets.count(); ++i) { | |
298 for (int j = 0; j < fFontStyleSets[i]->fStyles.count(); ++j) { | |
299 if (fFontStyleSets[i]->fStyles[j] == typeface) { | |
300 return fFontStyleSets[i]->matchStyle(style); | |
301 } | |
302 } | |
303 } | |
304 return NULL; | |
305 } | |
306 | |
307 virtual SkTypeface* onCreateFromData(SkData* data, int ttcIndex) const SK_OV ERRIDE { | |
308 SkAutoTUnref<SkStream> stream(new SkMemoryStream(data)); | |
309 return this->createFromStream(stream, ttcIndex); | |
310 } | |
311 | |
312 virtual SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const SK_OVERRIDE { | |
313 SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(path)); | |
314 return stream.get() ? this->createFromStream(stream, ttcIndex) : NULL; | |
315 } | |
316 | |
317 virtual SkTypeface* onCreateFromStream(SkStream* s, int ttcIndex) const SK_O VERRIDE { | |
318 SkAutoTUnref<SkStream> stream(s); | |
319 | |
320 bool isFixedPitch; | |
321 SkTypeface::Style style; | |
322 SkString name; | |
323 if (!SkTypeface_FreeType::ScanFont(stream, ttcIndex, &name, &style, &isF ixedPitch)) { | |
324 return NULL; | |
325 } | |
326 return SkNEW_ARGS(SkTypeface_AndroidStream, (stream.detach(), ttcIndex, | |
327 style, isFixedPitch, name)) ; | |
328 } | |
329 | |
330 | |
331 virtual SkTypeface* onLegacyCreateTypeface(const char familyName[], | |
332 unsigned styleBits) const SK_OVER RIDE { | |
333 SkTypeface::Style oldStyle = (SkTypeface::Style)styleBits; | |
334 SkFontStyle style = SkFontStyle(oldStyle & SkTypeface::kBold | |
335 ? SkFontStyle::kBold_Weight | |
336 : SkFontStyle::kNormal_Weight, | |
337 SkFontStyle::kNormal_Width, | |
338 oldStyle & SkTypeface::kItalic | |
339 ? SkFontStyle::kItalic_Slant | |
340 : SkFontStyle::kUpright_Slant); | |
341 SkTypeface* tf = NULL; | |
342 | |
343 if (NULL != familyName) { | |
344 // On Android, we must return NULL when we can't find the requested | |
345 // named typeface so that the system/app can provide their own recov ery | |
346 // mechanism. On other platforms we'd provide a typeface from the | |
347 // default family instead. | |
348 tf = this->onMatchFamilyStyle(familyName, style); | |
349 } else { | |
350 tf = fDefaultFamily->matchStyle(style); | |
351 } | |
352 | |
353 // TODO: double ref? qv matchStyle() | |
354 return SkSafeRef(tf); | |
355 } | |
356 | |
357 | |
358 private: | |
359 | |
360 SkTArray<SkAutoTUnref<SkFontStyleSet_Android>, true> fFontStyleSets; | |
361 SkFontStyleSet* fDefaultFamily; | |
362 SkTypeface* fDefaultTypeface; | |
363 | |
364 SkTDArray<NameToFamily> fNameToFamilyMap; | |
365 | |
366 void buildNameToFamilyMap(SkTDArray<FontFamily*> families) { | |
367 for (int i = 0; i < families.count(); i++) { | |
368 fFontStyleSets.push_back().reset( | |
369 SkNEW_ARGS(SkFontStyleSet_Android, (families[i]))); | |
370 for (int j = 0; j < families[i]->fNames.count(); j++) { | |
371 NameToFamily* nextEntry = fNameToFamilyMap.append(); | |
372 SkNEW_PLACEMENT_ARGS(&nextEntry->name, SkString, (families[i]->f Names[j])); | |
373 nextEntry->styleSet = fFontStyleSets.back().get(); | |
374 } | |
375 } | |
376 } | |
377 | |
378 void findDefaultFont() { | |
379 SkASSERT(!fFontStyleSets.empty()); | |
380 | |
381 static const char* gDefaultNames[] = { "sans-serif" }; | |
382 for (size_t i = 0; i < SK_ARRAY_COUNT(gDefaultNames); ++i) { | |
383 SkFontStyleSet* set = this->onMatchFamily(gDefaultNames[i]); | |
384 if (NULL == set) { | |
385 continue; | |
386 } | |
387 SkTypeface* tf = set->matchStyle(SkFontStyle()); | |
388 if (NULL == tf) { | |
389 continue; | |
390 } | |
391 fDefaultFamily = set; | |
392 fDefaultTypeface = tf; | |
393 break; | |
394 } | |
395 if (NULL == fDefaultTypeface) { | |
396 fDefaultFamily = fFontStyleSets[0]; | |
397 fDefaultTypeface = fDefaultFamily->createTypeface(0); | |
398 } | |
399 SkASSERT(fDefaultFamily); | |
400 SkASSERT(fDefaultTypeface); | |
401 } | |
402 | |
403 typedef SkFontMgr INHERITED; | |
404 }; | |
405 | |
406 /////////////////////////////////////////////////////////////////////////////// | |
407 | |
408 SkFontMgr* SkFontMgr::Factory() { | |
409 return SkNEW(SkFontMgr_Android); | |
410 } | |
411 | |
412 | |
413 | |
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