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comparison: gfx/skia/trunk/src/fonts/SkFontMgr_fontconfig.cpp

gfx/skia/trunk/src/fonts/SkFontMgr_fontconfig.cpp

branch
TOR_BUG_9701
changeset 15
b8a032363ba2
equal deleted inserted replaced
-1:000000000000 0:e5b48fa4219e
1 /*
2 * Copyright 2013 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 "SkFontMgr.h"
9 #include "SkFontStyle.h"
10 #include "SkFontConfigInterface.h"
11 #include "SkFontConfigTypeface.h"
12 #include "SkMath.h"
13 #include "SkString.h"
14 #include "SkTDArray.h"
15
16 // for now we pull these in directly. eventually we will solely rely on the
17 // SkFontConfigInterface instance.
18 #include <fontconfig/fontconfig.h>
19 #include <unistd.h>
20
21 // Defined in SkFontHost_FreeType.cpp
22 bool find_name_and_attributes(SkStream* stream, SkString* name,
23 SkTypeface::Style* style, bool* isFixedWidth);
24
25 // borrow this global from SkFontHost_fontconfig. eventually that file should
26 // go away, and be replaced with this one.
27 extern SkFontConfigInterface* SkFontHost_fontconfig_ref_global();
28 static SkFontConfigInterface* RefFCI() {
29 return SkFontHost_fontconfig_ref_global();
30 }
31
32 // look for the last substring after a '/' and return that, or return null.
33 static const char* find_just_name(const char* str) {
34 const char* last = strrchr(str, '/');
35 return last ? last + 1 : NULL;
36 }
37
38 static bool is_lower(char c) {
39 return c >= 'a' && c <= 'z';
40 }
41
42 static int get_int(FcPattern* pattern, const char field[]) {
43 int value;
44 if (FcPatternGetInteger(pattern, field, 0, &value) != FcResultMatch) {
45 value = SK_MinS32;
46 }
47 return value;
48 }
49
50 static const char* get_name(FcPattern* pattern, const char field[]) {
51 const char* name;
52 if (FcPatternGetString(pattern, field, 0, (FcChar8**)&name) != FcResultMatch) {
53 name = "";
54 }
55 return name;
56 }
57
58 static bool valid_pattern(FcPattern* pattern) {
59 FcBool is_scalable;
60 if (FcPatternGetBool(pattern, FC_SCALABLE, 0, &is_scalable) != FcResultMatch || !is_scalable) {
61 return false;
62 }
63
64 // fontconfig can also return fonts which are unreadable
65 const char* c_filename = get_name(pattern, FC_FILE);
66 if (0 == *c_filename) {
67 return false;
68 }
69 if (access(c_filename, R_OK) != 0) {
70 return false;
71 }
72 return true;
73 }
74
75 static bool match_name(FcPattern* pattern, const char family_name[]) {
76 return !strcasecmp(family_name, get_name(pattern, FC_FAMILY));
77 }
78
79 static FcPattern** MatchFont(FcFontSet* font_set,
80 const char post_config_family[],
81 int* count) {
82 // Older versions of fontconfig have a bug where they cannot select
83 // only scalable fonts so we have to manually filter the results.
84
85 FcPattern** iter = font_set->fonts;
86 FcPattern** stop = iter + font_set->nfont;
87 // find the first good match
88 for (; iter < stop; ++iter) {
89 if (valid_pattern(*iter)) {
90 break;
91 }
92 }
93
94 if (iter == stop || !match_name(*iter, post_config_family)) {
95 return NULL;
96 }
97
98 FcPattern** firstIter = iter++;
99 for (; iter < stop; ++iter) {
100 if (!valid_pattern(*iter) || !match_name(*iter, post_config_family)) {
101 break;
102 }
103 }
104
105 *count = iter - firstIter;
106 return firstIter;
107 }
108
109 class SkFontStyleSet_FC : public SkFontStyleSet {
110 public:
111 SkFontStyleSet_FC(FcPattern** matches, int count);
112 virtual ~SkFontStyleSet_FC();
113
114 virtual int count() SK_OVERRIDE { return fRecCount; }
115 virtual void getStyle(int index, SkFontStyle*, SkString* style) SK_OVERRIDE;
116 virtual SkTypeface* createTypeface(int index) SK_OVERRIDE;
117 virtual SkTypeface* matchStyle(const SkFontStyle& pattern) SK_OVERRIDE;
118
119 private:
120 struct Rec {
121 SkString fStyleName;
122 SkString fFileName;
123 SkFontStyle fStyle;
124 };
125 Rec* fRecs;
126 int fRecCount;
127 };
128
129 static int map_range(int value,
130 int old_min, int old_max, int new_min, int new_max) {
131 SkASSERT(old_min < old_max);
132 SkASSERT(new_min < new_max);
133 return new_min + SkMulDiv(value - old_min,
134 new_max - new_min, old_max - old_min);
135 }
136
137 static SkFontStyle make_fontconfig_style(FcPattern* match) {
138 int weight = get_int(match, FC_WEIGHT);
139 int width = get_int(match, FC_WIDTH);
140 int slant = get_int(match, FC_SLANT);
141 // SkDebugf("old weight %d new weight %d\n", weight, map_range(weight, 0, 80, 0, 400));
142
143 // fontconfig weight seems to be 0..200 or so, so we remap it here
144 weight = map_range(weight, 0, 80, 0, 400);
145 width = map_range(width, 0, 200, 0, 9);
146 return SkFontStyle(weight, width, slant > 0 ? SkFontStyle::kItalic_Slant
147 : SkFontStyle::kUpright_Slant);
148 }
149
150 SkFontStyleSet_FC::SkFontStyleSet_FC(FcPattern** matches, int count) {
151 fRecCount = count;
152 fRecs = SkNEW_ARRAY(Rec, count);
153 for (int i = 0; i < count; ++i) {
154 fRecs[i].fStyleName.set(get_name(matches[i], FC_STYLE));
155 fRecs[i].fFileName.set(get_name(matches[i], FC_FILE));
156 fRecs[i].fStyle = make_fontconfig_style(matches[i]);
157 }
158 }
159
160 SkFontStyleSet_FC::~SkFontStyleSet_FC() {
161 SkDELETE_ARRAY(fRecs);
162 }
163
164 void SkFontStyleSet_FC::getStyle(int index, SkFontStyle* style,
165 SkString* styleName) {
166 SkASSERT((unsigned)index < (unsigned)fRecCount);
167 if (style) {
168 *style = fRecs[index].fStyle;
169 }
170 if (styleName) {
171 *styleName = fRecs[index].fStyleName;
172 }
173 }
174
175 SkTypeface* SkFontStyleSet_FC::createTypeface(int index) {
176 return NULL;
177 }
178
179 SkTypeface* SkFontStyleSet_FC::matchStyle(const SkFontStyle& pattern) {
180 return NULL;
181 }
182
183 class SkFontMgr_fontconfig : public SkFontMgr {
184 SkAutoTUnref<SkFontConfigInterface> fFCI;
185 SkDataTable* fFamilyNames;
186
187
188 public:
189 SkFontMgr_fontconfig(SkFontConfigInterface* fci)
190 : fFCI(fci)
191 , fFamilyNames(fFCI->getFamilyNames()) {}
192
193 virtual ~SkFontMgr_fontconfig() {
194 SkSafeUnref(fFamilyNames);
195 }
196
197 protected:
198 virtual int onCountFamilies() const SK_OVERRIDE {
199 return fFamilyNames->count();
200 }
201
202 virtual void onGetFamilyName(int index, SkString* familyName) const SK_OVERRIDE {
203 familyName->set(fFamilyNames->atStr(index));
204 }
205
206 virtual SkFontStyleSet* onCreateStyleSet(int index) const SK_OVERRIDE {
207 return this->onMatchFamily(fFamilyNames->atStr(index));
208 }
209
210 virtual SkFontStyleSet* onMatchFamily(const char familyName[]) const SK_OVERRIDE {
211 FcPattern* pattern = FcPatternCreate();
212
213 FcPatternAddString(pattern, FC_FAMILY, (FcChar8*)familyName);
214 #if 0
215 FcPatternAddBool(pattern, FC_SCALABLE, FcTrue);
216 #endif
217 FcConfigSubstitute(NULL, pattern, FcMatchPattern);
218 FcDefaultSubstitute(pattern);
219
220 const char* post_config_family = get_name(pattern, FC_FAMILY);
221
222 FcResult result;
223 FcFontSet* font_set = FcFontSort(0, pattern, 0, 0, &result);
224 if (!font_set) {
225 FcPatternDestroy(pattern);
226 return NULL;
227 }
228
229 int count;
230 FcPattern** match = MatchFont(font_set, post_config_family, &count);
231 if (!match) {
232 FcPatternDestroy(pattern);
233 FcFontSetDestroy(font_set);
234 return NULL;
235 }
236
237 FcPatternDestroy(pattern);
238
239 SkTDArray<FcPattern*> trimmedMatches;
240 for (int i = 0; i < count; ++i) {
241 const char* justName = find_just_name(get_name(match[i], FC_FILE));
242 if (!is_lower(*justName)) {
243 *trimmedMatches.append() = match[i];
244 }
245 }
246
247 SkFontStyleSet_FC* sset = SkNEW_ARGS(SkFontStyleSet_FC,
248 (trimmedMatches.begin(),
249 trimmedMatches.count()));
250 return sset;
251 }
252
253 virtual SkTypeface* onMatchFamilyStyle(const char familyName[],
254 const SkFontStyle&) const SK_OVERRIDE { return NULL; }
255 virtual SkTypeface* onMatchFaceStyle(const SkTypeface*,
256 const SkFontStyle&) const SK_OVERRIDE { return NULL; }
257
258 virtual SkTypeface* onCreateFromData(SkData*, int ttcIndex) const SK_OVERRIDE { return NULL; }
259
260 virtual SkTypeface* onCreateFromStream(SkStream* stream, int ttcIndex) const SK_OVERRIDE {
261 const size_t length = stream->getLength();
262 if (!length) {
263 return NULL;
264 }
265 if (length >= 1024 * 1024 * 1024) {
266 return NULL; // don't accept too large fonts (>= 1GB) for safety.
267 }
268
269 // TODO should the caller give us the style or should we get it from freetype?
270 SkTypeface::Style style = SkTypeface::kNormal;
271 bool isFixedWidth = false;
272 if (!find_name_and_attributes(stream, NULL, &style, &isFixedWidth)) {
273 return NULL;
274 }
275
276 SkTypeface* face = SkNEW_ARGS(FontConfigTypeface, (style, isFixedWidth, stream));
277 return face;
278 }
279
280 virtual SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const SK_OVERRIDE {
281 SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(path));
282 return stream.get() ? this->createFromStream(stream, ttcIndex) : NULL;
283 }
284
285 virtual SkTypeface* onLegacyCreateTypeface(const char familyName[],
286 unsigned styleBits) const SK_OVERRIDE {
287 return FontConfigTypeface::LegacyCreateTypeface(NULL, familyName,
288 (SkTypeface::Style)styleBits);
289 }
290 };
291
292 SkFontMgr* SkFontMgr::Factory() {
293 SkFontConfigInterface* fci = RefFCI();
294 return fci ? SkNEW_ARGS(SkFontMgr_fontconfig, (fci)) : NULL;
295 }

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