reed@google.com | 381bb43 | 2013-05-13 19:43:59 +0000 | [diff] [blame] | 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" |
reed@google.com | e027a6e | 2013-07-31 17:37:31 +0000 | [diff] [blame] | 11 | #include "SkFontConfigTypeface.h" |
reed@google.com | 381bb43 | 2013-05-13 19:43:59 +0000 | [diff] [blame] | 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 | // borrow this global from SkFontHost_fontconfig. eventually that file should |
| 22 | // go away, and be replaced with this one. |
| 23 | extern SkFontConfigInterface* SkFontHost_fontconfig_ref_global(); |
| 24 | static SkFontConfigInterface* RefFCI() { |
| 25 | return SkFontHost_fontconfig_ref_global(); |
| 26 | } |
| 27 | |
| 28 | // look for the last substring after a '/' and return that, or return null. |
| 29 | static const char* find_just_name(const char* str) { |
| 30 | const char* last = strrchr(str, '/'); |
| 31 | return last ? last + 1 : NULL; |
| 32 | } |
| 33 | |
| 34 | static bool is_lower(char c) { |
| 35 | return c >= 'a' && c <= 'z'; |
| 36 | } |
| 37 | |
| 38 | static int get_int(FcPattern* pattern, const char field[]) { |
| 39 | int value; |
| 40 | if (FcPatternGetInteger(pattern, field, 0, &value) != FcResultMatch) { |
| 41 | value = SK_MinS32; |
| 42 | } |
| 43 | return value; |
| 44 | } |
| 45 | |
| 46 | static const char* get_name(FcPattern* pattern, const char field[]) { |
| 47 | const char* name; |
| 48 | if (FcPatternGetString(pattern, field, 0, (FcChar8**)&name) != FcResultMatch) { |
| 49 | name = ""; |
| 50 | } |
| 51 | return name; |
| 52 | } |
| 53 | |
| 54 | static bool valid_pattern(FcPattern* pattern) { |
| 55 | FcBool is_scalable; |
| 56 | if (FcPatternGetBool(pattern, FC_SCALABLE, 0, &is_scalable) != FcResultMatch || !is_scalable) { |
| 57 | return false; |
| 58 | } |
| 59 | |
| 60 | // fontconfig can also return fonts which are unreadable |
| 61 | const char* c_filename = get_name(pattern, FC_FILE); |
| 62 | if (0 == *c_filename) { |
| 63 | return false; |
| 64 | } |
| 65 | if (access(c_filename, R_OK) != 0) { |
| 66 | return false; |
| 67 | } |
| 68 | return true; |
| 69 | } |
| 70 | |
| 71 | static bool match_name(FcPattern* pattern, const char family_name[]) { |
| 72 | return !strcasecmp(family_name, get_name(pattern, FC_FAMILY)); |
| 73 | } |
| 74 | |
| 75 | static FcPattern** MatchFont(FcFontSet* font_set, |
| 76 | const char post_config_family[], |
| 77 | int* count) { |
| 78 | // Older versions of fontconfig have a bug where they cannot select |
| 79 | // only scalable fonts so we have to manually filter the results. |
| 80 | |
| 81 | FcPattern** iter = font_set->fonts; |
| 82 | FcPattern** stop = iter + font_set->nfont; |
| 83 | // find the first good match |
| 84 | for (; iter < stop; ++iter) { |
| 85 | if (valid_pattern(*iter)) { |
| 86 | break; |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | if (iter == stop || !match_name(*iter, post_config_family)) { |
| 91 | return NULL; |
| 92 | } |
| 93 | |
| 94 | FcPattern** firstIter = iter++; |
| 95 | for (; iter < stop; ++iter) { |
| 96 | if (!valid_pattern(*iter) || !match_name(*iter, post_config_family)) { |
| 97 | break; |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | *count = iter - firstIter; |
| 102 | return firstIter; |
| 103 | } |
| 104 | |
| 105 | class SkFontStyleSet_FC : public SkFontStyleSet { |
| 106 | public: |
| 107 | SkFontStyleSet_FC(FcPattern** matches, int count); |
| 108 | virtual ~SkFontStyleSet_FC(); |
| 109 | |
| 110 | virtual int count() SK_OVERRIDE { return fRecCount; } |
| 111 | virtual void getStyle(int index, SkFontStyle*, SkString* style) SK_OVERRIDE; |
| 112 | virtual SkTypeface* createTypeface(int index) SK_OVERRIDE; |
| 113 | virtual SkTypeface* matchStyle(const SkFontStyle& pattern) SK_OVERRIDE; |
| 114 | |
| 115 | private: |
| 116 | struct Rec { |
| 117 | SkString fStyleName; |
| 118 | SkString fFileName; |
| 119 | SkFontStyle fStyle; |
| 120 | }; |
| 121 | Rec* fRecs; |
| 122 | int fRecCount; |
| 123 | }; |
| 124 | |
| 125 | static int map_range(int value, |
| 126 | int old_min, int old_max, int new_min, int new_max) { |
| 127 | SkASSERT(old_min < old_max); |
| 128 | SkASSERT(new_min < new_max); |
| 129 | return new_min + SkMulDiv(value - old_min, |
| 130 | new_max - new_min, old_max - old_min); |
| 131 | } |
| 132 | |
| 133 | static SkFontStyle make_fontconfig_style(FcPattern* match) { |
| 134 | int weight = get_int(match, FC_WEIGHT); |
| 135 | int width = get_int(match, FC_WIDTH); |
| 136 | int slant = get_int(match, FC_SLANT); |
| 137 | // SkDebugf("old weight %d new weight %d\n", weight, map_range(weight, 0, 80, 0, 400)); |
| 138 | |
| 139 | // fontconfig weight seems to be 0..200 or so, so we remap it here |
| 140 | weight = map_range(weight, 0, 80, 0, 400); |
| 141 | width = map_range(width, 0, 200, 0, 9); |
| 142 | return SkFontStyle(weight, width, slant > 0 ? SkFontStyle::kItalic_Slant |
| 143 | : SkFontStyle::kUpright_Slant); |
| 144 | } |
| 145 | |
| 146 | SkFontStyleSet_FC::SkFontStyleSet_FC(FcPattern** matches, int count) { |
| 147 | fRecCount = count; |
| 148 | fRecs = SkNEW_ARRAY(Rec, count); |
| 149 | for (int i = 0; i < count; ++i) { |
| 150 | fRecs[i].fStyleName.set(get_name(matches[i], FC_STYLE)); |
| 151 | fRecs[i].fFileName.set(get_name(matches[i], FC_FILE)); |
| 152 | fRecs[i].fStyle = make_fontconfig_style(matches[i]); |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | SkFontStyleSet_FC::~SkFontStyleSet_FC() { |
| 157 | SkDELETE_ARRAY(fRecs); |
| 158 | } |
| 159 | |
| 160 | void SkFontStyleSet_FC::getStyle(int index, SkFontStyle* style, |
| 161 | SkString* styleName) { |
| 162 | SkASSERT((unsigned)index < (unsigned)fRecCount); |
| 163 | if (style) { |
| 164 | *style = fRecs[index].fStyle; |
| 165 | } |
| 166 | if (styleName) { |
| 167 | *styleName = fRecs[index].fStyleName; |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | SkTypeface* SkFontStyleSet_FC::createTypeface(int index) { |
| 172 | return NULL; |
| 173 | } |
| 174 | |
| 175 | SkTypeface* SkFontStyleSet_FC::matchStyle(const SkFontStyle& pattern) { |
| 176 | return NULL; |
| 177 | } |
| 178 | |
| 179 | class SkFontMgr_fontconfig : public SkFontMgr { |
| 180 | SkAutoTUnref<SkFontConfigInterface> fFCI; |
| 181 | SkDataTable* fFamilyNames; |
| 182 | |
| 183 | void init() { |
| 184 | if (!fFamilyNames) { |
| 185 | fFamilyNames = fFCI->getFamilyNames(); |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | public: |
| 190 | SkFontMgr_fontconfig(SkFontConfigInterface* fci) |
| 191 | : fFCI(fci) |
| 192 | , fFamilyNames(NULL) {} |
| 193 | |
| 194 | virtual ~SkFontMgr_fontconfig() { |
| 195 | SkSafeUnref(fFamilyNames); |
| 196 | } |
| 197 | |
| 198 | protected: |
| 199 | virtual int onCountFamilies() { |
| 200 | this->init(); |
| 201 | return fFamilyNames->count(); |
| 202 | } |
| 203 | |
| 204 | virtual void onGetFamilyName(int index, SkString* familyName) { |
| 205 | this->init(); |
| 206 | familyName->set(fFamilyNames->atStr(index)); |
| 207 | } |
| 208 | |
| 209 | virtual SkFontStyleSet* onCreateStyleSet(int index) { |
| 210 | this->init(); |
| 211 | return this->onMatchFamily(fFamilyNames->atStr(index)); |
| 212 | } |
| 213 | |
| 214 | virtual SkFontStyleSet* onMatchFamily(const char familyName[]) { |
| 215 | this->init(); |
| 216 | |
| 217 | FcPattern* pattern = FcPatternCreate(); |
| 218 | |
| 219 | FcPatternAddString(pattern, FC_FAMILY, (FcChar8*)familyName); |
| 220 | #if 0 |
| 221 | FcPatternAddBool(pattern, FC_SCALABLE, FcTrue); |
| 222 | #endif |
| 223 | FcConfigSubstitute(NULL, pattern, FcMatchPattern); |
| 224 | FcDefaultSubstitute(pattern); |
| 225 | |
| 226 | const char* post_config_family = get_name(pattern, FC_FAMILY); |
| 227 | |
| 228 | FcResult result; |
| 229 | FcFontSet* font_set = FcFontSort(0, pattern, 0, 0, &result); |
| 230 | if (!font_set) { |
| 231 | FcPatternDestroy(pattern); |
| 232 | return NULL; |
| 233 | } |
| 234 | |
| 235 | int count; |
| 236 | FcPattern** match = MatchFont(font_set, post_config_family, &count); |
| 237 | if (!match) { |
| 238 | FcPatternDestroy(pattern); |
| 239 | FcFontSetDestroy(font_set); |
| 240 | return NULL; |
| 241 | } |
| 242 | |
| 243 | FcPatternDestroy(pattern); |
| 244 | |
| 245 | SkTDArray<FcPattern*> trimmedMatches; |
| 246 | for (int i = 0; i < count; ++i) { |
| 247 | const char* justName = find_just_name(get_name(match[i], FC_FILE)); |
| 248 | if (!is_lower(*justName)) { |
| 249 | *trimmedMatches.append() = match[i]; |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | SkFontStyleSet_FC* sset = SkNEW_ARGS(SkFontStyleSet_FC, |
| 254 | (trimmedMatches.begin(), |
| 255 | trimmedMatches.count())); |
| 256 | return sset; |
| 257 | } |
| 258 | |
| 259 | virtual SkTypeface* onMatchFamilyStyle(const char familyName[], |
| 260 | const SkFontStyle&) { return NULL; } |
| 261 | virtual SkTypeface* onMatchFaceStyle(const SkTypeface*, |
| 262 | const SkFontStyle&) { return NULL; } |
| 263 | |
| 264 | virtual SkTypeface* onCreateFromData(SkData*, int ttcIndex) { return NULL; } |
reed@google.com | b6bd24d | 2013-07-31 18:49:33 +0000 | [diff] [blame^] | 265 | |
| 266 | virtual SkTypeface* onCreateFromStream(SkStream* stream, int ttcIndex) { |
| 267 | const size_t length = stream->getLength(); |
| 268 | if (!length) { |
| 269 | return NULL; |
| 270 | } |
| 271 | if (length >= 1024 * 1024 * 1024) { |
| 272 | return NULL; // don't accept too large fonts (>= 1GB) for safety. |
| 273 | } |
| 274 | |
| 275 | // TODO should the caller give us the style? |
| 276 | SkTypeface::Style style = SkTypeface::kNormal; |
| 277 | SkTypeface* face = SkNEW_ARGS(FontConfigTypeface, (style, stream)); |
| 278 | return face; |
reed@google.com | 381bb43 | 2013-05-13 19:43:59 +0000 | [diff] [blame] | 279 | } |
reed@google.com | b6bd24d | 2013-07-31 18:49:33 +0000 | [diff] [blame^] | 280 | |
reed@google.com | 381bb43 | 2013-05-13 19:43:59 +0000 | [diff] [blame] | 281 | virtual SkTypeface* onCreateFromFile(const char path[], int ttcIndex) { |
reed@google.com | b6bd24d | 2013-07-31 18:49:33 +0000 | [diff] [blame^] | 282 | SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(path)); |
| 283 | return stream.get() ? this->createFromStream(stream, ttcIndex) : NULL; |
reed@google.com | 381bb43 | 2013-05-13 19:43:59 +0000 | [diff] [blame] | 284 | } |
reed@google.com | e027a6e | 2013-07-31 17:37:31 +0000 | [diff] [blame] | 285 | |
| 286 | virtual SkTypeface* onLegacyCreateTypeface(const char familyName[], |
| 287 | unsigned styleBits) SK_OVERRIDE { |
| 288 | return FontConfigTypeface::LegacyCreateTypeface(NULL, familyName, |
| 289 | (SkTypeface::Style)styleBits); |
| 290 | } |
reed@google.com | 381bb43 | 2013-05-13 19:43:59 +0000 | [diff] [blame] | 291 | }; |
| 292 | |
| 293 | SkFontMgr* SkFontMgr::Factory() { |
| 294 | SkFontConfigInterface* fci = RefFCI(); |
| 295 | return fci ? SkNEW_ARGS(SkFontMgr_fontconfig, (fci)) : NULL; |
| 296 | } |