| /* |
| * Copyright 2009-2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| /* migrated from chrome/src/skia/ext/SkFontHost_fontconfig_direct.cpp */ |
| |
| #include "SkAutoMalloc.h" |
| #include "SkBuffer.h" |
| #include "SkFixed.h" |
| #include "SkFontConfigInterface_direct.h" |
| #include "SkFontStyle.h" |
| #include "SkMutex.h" |
| #include "SkStream.h" |
| #include "SkString.h" |
| #include "SkTArray.h" |
| #include "SkTDArray.h" |
| #include "SkTemplates.h" |
| #include "SkTypeface.h" |
| |
| #include <fontconfig/fontconfig.h> |
| #include <unistd.h> |
| |
| #ifdef SK_DEBUG |
| # include "SkTLS.h" |
| #endif |
| |
| namespace { |
| |
| // Fontconfig is not threadsafe before 2.10.91. Before that, we lock with a global mutex. |
| // See https://bug.skia.org/1497 for background. |
| SK_DECLARE_STATIC_MUTEX(gFCMutex); |
| |
| #ifdef SK_DEBUG |
| void* CreateThreadFcLocked() { return new bool(false); } |
| void DeleteThreadFcLocked(void* v) { delete static_cast<bool*>(v); } |
| # define THREAD_FC_LOCKED \ |
| static_cast<bool*>(SkTLS::Get(CreateThreadFcLocked, DeleteThreadFcLocked)) |
| #endif |
| |
| struct FCLocker { |
| // Assume FcGetVersion() has always been thread safe. |
| |
| FCLocker() { |
| if (FcGetVersion() < 21091) { |
| gFCMutex.acquire(); |
| } else { |
| SkDEBUGCODE(bool* threadLocked = THREAD_FC_LOCKED); |
| SkASSERT(false == *threadLocked); |
| SkDEBUGCODE(*threadLocked = true); |
| } |
| } |
| |
| ~FCLocker() { |
| AssertHeld(); |
| if (FcGetVersion() < 21091) { |
| gFCMutex.release(); |
| } else { |
| SkDEBUGCODE(*THREAD_FC_LOCKED = false); |
| } |
| } |
| |
| static void AssertHeld() { SkDEBUGCODE( |
| if (FcGetVersion() < 21091) { |
| gFCMutex.assertHeld(); |
| } else { |
| SkASSERT(true == *THREAD_FC_LOCKED); |
| } |
| ) } |
| }; |
| |
| } // namespace |
| |
| size_t SkFontConfigInterface::FontIdentity::writeToMemory(void* addr) const { |
| size_t size = sizeof(fID) + sizeof(fTTCIndex); |
| size += sizeof(int32_t) + sizeof(int32_t) + sizeof(uint8_t); // weight, width, italic |
| size += sizeof(int32_t) + fString.size(); // store length+data |
| if (addr) { |
| SkWBuffer buffer(addr, size); |
| |
| buffer.write32(fID); |
| buffer.write32(fTTCIndex); |
| buffer.write32(fString.size()); |
| buffer.write32(fStyle.weight()); |
| buffer.write32(fStyle.width()); |
| buffer.write8(fStyle.slant()); |
| buffer.write(fString.c_str(), fString.size()); |
| buffer.padToAlign4(); |
| |
| SkASSERT(buffer.pos() == size); |
| } |
| return size; |
| } |
| |
| size_t SkFontConfigInterface::FontIdentity::readFromMemory(const void* addr, |
| size_t size) { |
| SkRBuffer buffer(addr, size); |
| |
| (void)buffer.readU32(&fID); |
| (void)buffer.readS32(&fTTCIndex); |
| uint32_t strLen, weight, width; |
| (void)buffer.readU32(&strLen); |
| (void)buffer.readU32(&weight); |
| (void)buffer.readU32(&width); |
| uint8_t u8; |
| (void)buffer.readU8(&u8); |
| SkFontStyle::Slant slant = (SkFontStyle::Slant)u8; |
| fStyle = SkFontStyle(weight, width, slant); |
| fString.resize(strLen); |
| (void)buffer.read(fString.writable_str(), strLen); |
| buffer.skipToAlign4(); |
| |
| return buffer.pos(); // the actual number of bytes read |
| } |
| |
| #ifdef SK_DEBUG |
| static void make_iden(SkFontConfigInterface::FontIdentity* iden) { |
| iden->fID = 10; |
| iden->fTTCIndex = 2; |
| iden->fString.set("Hello world"); |
| iden->fStyle = SkFontStyle(300, 6, SkFontStyle::kItalic_Slant); |
| } |
| |
| static void test_writeToMemory(const SkFontConfigInterface::FontIdentity& iden0, |
| int initValue) { |
| SkFontConfigInterface::FontIdentity iden1; |
| |
| size_t size0 = iden0.writeToMemory(nullptr); |
| |
| SkAutoMalloc storage(size0); |
| memset(storage.get(), initValue, size0); |
| |
| size_t size1 = iden0.writeToMemory(storage.get()); |
| SkASSERT(size0 == size1); |
| |
| SkASSERT(iden0 != iden1); |
| size_t size2 = iden1.readFromMemory(storage.get(), size1); |
| SkASSERT(size2 == size1); |
| SkASSERT(iden0 == iden1); |
| } |
| |
| static void fontconfiginterface_unittest() { |
| SkFontConfigInterface::FontIdentity iden0, iden1; |
| |
| SkASSERT(iden0 == iden1); |
| |
| make_iden(&iden0); |
| SkASSERT(iden0 != iden1); |
| |
| make_iden(&iden1); |
| SkASSERT(iden0 == iden1); |
| |
| test_writeToMemory(iden0, 0); |
| test_writeToMemory(iden0, 0); |
| } |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| // Returns the string from the pattern, or nullptr |
| static const char* get_string(FcPattern* pattern, const char field[], int index = 0) { |
| const char* name; |
| if (FcPatternGetString(pattern, field, index, (FcChar8**)&name) != FcResultMatch) { |
| name = nullptr; |
| } |
| return name; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| namespace { |
| |
| // Equivalence classes, used to match the Liberation and other fonts |
| // with their metric-compatible replacements. See the discussion in |
| // GetFontEquivClass(). |
| enum FontEquivClass |
| { |
| OTHER, |
| SANS, |
| SERIF, |
| MONO, |
| SYMBOL, |
| PGOTHIC, |
| GOTHIC, |
| PMINCHO, |
| MINCHO, |
| SIMSUN, |
| NSIMSUN, |
| SIMHEI, |
| PMINGLIU, |
| MINGLIU, |
| PMINGLIUHK, |
| MINGLIUHK, |
| CAMBRIA, |
| CALIBRI, |
| }; |
| |
| // Match the font name against a whilelist of fonts, returning the equivalence |
| // class. |
| FontEquivClass GetFontEquivClass(const char* fontname) |
| { |
| // It would be nice for fontconfig to tell us whether a given suggested |
| // replacement is a "strong" match (that is, an equivalent font) or |
| // a "weak" match (that is, fontconfig's next-best attempt at finding a |
| // substitute). However, I played around with the fontconfig API for |
| // a good few hours and could not make it reveal this information. |
| // |
| // So instead, we hardcode. Initially this function emulated |
| // /etc/fonts/conf.d/30-metric-aliases.conf |
| // from my Ubuntu system, but we're better off being very conservative. |
| |
| // Arimo, Tinos and Cousine are a set of fonts metric-compatible with |
| // Arial, Times New Roman and Courier New with a character repertoire |
| // much larger than Liberation. Note that Cousine is metrically |
| // compatible with Courier New, but the former is sans-serif while |
| // the latter is serif. |
| |
| |
| struct FontEquivMap { |
| FontEquivClass clazz; |
| const char name[40]; |
| }; |
| |
| static const FontEquivMap kFontEquivMap[] = { |
| { SANS, "Arial" }, |
| { SANS, "Arimo" }, |
| { SANS, "Liberation Sans" }, |
| |
| { SERIF, "Times New Roman" }, |
| { SERIF, "Tinos" }, |
| { SERIF, "Liberation Serif" }, |
| |
| { MONO, "Courier New" }, |
| { MONO, "Cousine" }, |
| { MONO, "Liberation Mono" }, |
| |
| { SYMBOL, "Symbol" }, |
| { SYMBOL, "Symbol Neu" }, |
| |
| // ＭＳ Ｐゴシック |
| { PGOTHIC, "MS PGothic" }, |
| { PGOTHIC, "\xef\xbc\xad\xef\xbc\xb3 \xef\xbc\xb0" |
| "\xe3\x82\xb4\xe3\x82\xb7\xe3\x83\x83\xe3\x82\xaf" }, |
| { PGOTHIC, "Noto Sans CJK JP" }, |
| { PGOTHIC, "IPAPGothic" }, |
| { PGOTHIC, "MotoyaG04Gothic" }, |
| |
| // ＭＳ ゴシック |
| { GOTHIC, "MS Gothic" }, |
| { GOTHIC, "\xef\xbc\xad\xef\xbc\xb3 " |
| "\xe3\x82\xb4\xe3\x82\xb7\xe3\x83\x83\xe3\x82\xaf" }, |
| { GOTHIC, "Noto Sans Mono CJK JP" }, |
| { GOTHIC, "IPAGothic" }, |
| { GOTHIC, "MotoyaG04GothicMono" }, |
| |
| // ＭＳ Ｐ明朝 |
| { PMINCHO, "MS PMincho" }, |
| { PMINCHO, "\xef\xbc\xad\xef\xbc\xb3 \xef\xbc\xb0" |
| "\xe6\x98\x8e\xe6\x9c\x9d"}, |
| { PMINCHO, "Noto Serif CJK JP" }, |
| { PMINCHO, "IPAPMincho" }, |
| { PMINCHO, "MotoyaG04Mincho" }, |
| |
| // ＭＳ 明朝 |
| { MINCHO, "MS Mincho" }, |
| { MINCHO, "\xef\xbc\xad\xef\xbc\xb3 \xe6\x98\x8e\xe6\x9c\x9d" }, |
| { MINCHO, "Noto Serif CJK JP" }, |
| { MINCHO, "IPAMincho" }, |
| { MINCHO, "MotoyaG04MinchoMono" }, |
| |
| // 宋体 |
| { SIMSUN, "Simsun" }, |
| { SIMSUN, "\xe5\xae\x8b\xe4\xbd\x93" }, |
| { SIMSUN, "Noto Serif CJK SC" }, |
| { SIMSUN, "MSung GB18030" }, |
| { SIMSUN, "Song ASC" }, |
| |
| // 新宋体 |
| { NSIMSUN, "NSimsun" }, |
| { NSIMSUN, "\xe6\x96\xb0\xe5\xae\x8b\xe4\xbd\x93" }, |
| { NSIMSUN, "Noto Serif CJK SC" }, |
| { NSIMSUN, "MSung GB18030" }, |
| { NSIMSUN, "N Song ASC" }, |
| |
| // 黑体 |
| { SIMHEI, "Simhei" }, |
| { SIMHEI, "\xe9\xbb\x91\xe4\xbd\x93" }, |
| { SIMHEI, "Noto Sans CJK SC" }, |
| { SIMHEI, "MYingHeiGB18030" }, |
| { SIMHEI, "MYingHeiB5HK" }, |
| |
| // 新細明體 |
| { PMINGLIU, "PMingLiU"}, |
| { PMINGLIU, "\xe6\x96\xb0\xe7\xb4\xb0\xe6\x98\x8e\xe9\xab\x94" }, |
| { PMINGLIU, "Noto Serif CJK TC"}, |
| { PMINGLIU, "MSung B5HK"}, |
| |
| // 細明體 |
| { MINGLIU, "MingLiU"}, |
| { MINGLIU, "\xe7\xb4\xb0\xe6\x98\x8e\xe9\xab\x94" }, |
| { MINGLIU, "Noto Serif CJK TC"}, |
| { MINGLIU, "MSung B5HK"}, |
| |
| // 新細明體 |
| { PMINGLIUHK, "PMingLiU_HKSCS"}, |
| { PMINGLIUHK, "\xe6\x96\xb0\xe7\xb4\xb0\xe6\x98\x8e\xe9\xab\x94_HKSCS" }, |
| { PMINGLIUHK, "Noto Serif CJK TC"}, |
| { PMINGLIUHK, "MSung B5HK"}, |
| |
| // 細明體 |
| { MINGLIUHK, "MingLiU_HKSCS"}, |
| { MINGLIUHK, "\xe7\xb4\xb0\xe6\x98\x8e\xe9\xab\x94_HKSCS" }, |
| { MINGLIUHK, "Noto Serif CJK TC"}, |
| { MINGLIUHK, "MSung B5HK"}, |
| |
| // Cambria |
| { CAMBRIA, "Cambria" }, |
| { CAMBRIA, "Caladea" }, |
| |
| // Calibri |
| { CALIBRI, "Calibri" }, |
| { CALIBRI, "Carlito" }, |
| }; |
| |
| static const size_t kFontCount = |
| sizeof(kFontEquivMap)/sizeof(kFontEquivMap[0]); |
| |
| // TODO(jungshik): If this loop turns out to be hot, turn |
| // the array to a static (hash)map to speed it up. |
| for (size_t i = 0; i < kFontCount; ++i) { |
| if (strcasecmp(kFontEquivMap[i].name, fontname) == 0) |
| return kFontEquivMap[i].clazz; |
| } |
| return OTHER; |
| } |
| |
| |
| // Return true if |font_a| and |font_b| are visually and at the metrics |
| // level interchangeable. |
| bool IsMetricCompatibleReplacement(const char* font_a, const char* font_b) |
| { |
| FontEquivClass class_a = GetFontEquivClass(font_a); |
| FontEquivClass class_b = GetFontEquivClass(font_b); |
| |
| return class_a != OTHER && class_a == class_b; |
| } |
| |
| // Normally we only return exactly the font asked for. In last-resort |
| // cases, the request either doesn't specify a font or is one of the |
| // basic font names like "Sans", "Serif" or "Monospace". This function |
| // tells you whether a given request is for such a fallback. |
| bool IsFallbackFontAllowed(const SkString& family) { |
| const char* family_cstr = family.c_str(); |
| return family.isEmpty() || |
| strcasecmp(family_cstr, "sans") == 0 || |
| strcasecmp(family_cstr, "serif") == 0 || |
| strcasecmp(family_cstr, "monospace") == 0; |
| } |
| |
| // Retrieves |is_bold|, |is_italic| and |font_family| properties from |font|. |
| static int get_int(FcPattern* pattern, const char object[], int missing) { |
| int value; |
| if (FcPatternGetInteger(pattern, object, 0, &value) != FcResultMatch) { |
| return missing; |
| } |
| return value; |
| } |
| |
| static int map_range(SkScalar value, |
| SkScalar old_min, SkScalar old_max, |
| SkScalar new_min, SkScalar new_max) |
| { |
| SkASSERT(old_min < old_max); |
| SkASSERT(new_min <= new_max); |
| return new_min + ((value - old_min) * (new_max - new_min) / (old_max - old_min)); |
| } |
| |
| struct MapRanges { |
| SkScalar old_val; |
| SkScalar new_val; |
| }; |
| |
| static SkScalar map_ranges(SkScalar val, MapRanges const ranges[], int rangesCount) { |
| // -Inf to [0] |
| if (val < ranges[0].old_val) { |
| return ranges[0].new_val; |
| } |
| |
| // Linear from [i] to [i+1] |
| for (int i = 0; i < rangesCount - 1; ++i) { |
| if (val < ranges[i+1].old_val) { |
| return map_range(val, ranges[i].old_val, ranges[i+1].old_val, |
| ranges[i].new_val, ranges[i+1].new_val); |
| } |
| } |
| |
| // From [n] to +Inf |
| // if (fcweight < Inf) |
| return ranges[rangesCount-1].new_val; |
| } |
| |
| #ifndef FC_WEIGHT_DEMILIGHT |
| #define FC_WEIGHT_DEMILIGHT 65 |
| #endif |
| |
| static SkFontStyle skfontstyle_from_fcpattern(FcPattern* pattern) { |
| typedef SkFontStyle SkFS; |
| |
| static constexpr MapRanges weightRanges[] = { |
| { FC_WEIGHT_THIN, SkFS::kThin_Weight }, |
| { FC_WEIGHT_EXTRALIGHT, SkFS::kExtraLight_Weight }, |
| { FC_WEIGHT_LIGHT, SkFS::kLight_Weight }, |
| { FC_WEIGHT_DEMILIGHT, 350 }, |
| { FC_WEIGHT_BOOK, 380 }, |
| { FC_WEIGHT_REGULAR, SkFS::kNormal_Weight }, |
| { FC_WEIGHT_MEDIUM, SkFS::kMedium_Weight }, |
| { FC_WEIGHT_DEMIBOLD, SkFS::kSemiBold_Weight }, |
| { FC_WEIGHT_BOLD, SkFS::kBold_Weight }, |
| { FC_WEIGHT_EXTRABOLD, SkFS::kExtraBold_Weight }, |
| { FC_WEIGHT_BLACK, SkFS::kBlack_Weight }, |
| { FC_WEIGHT_EXTRABLACK, SkFS::kExtraBlack_Weight }, |
| }; |
| SkScalar weight = map_ranges(get_int(pattern, FC_WEIGHT, FC_WEIGHT_REGULAR), |
| weightRanges, SK_ARRAY_COUNT(weightRanges)); |
| |
| static constexpr MapRanges widthRanges[] = { |
| { FC_WIDTH_ULTRACONDENSED, SkFS::kUltraCondensed_Width }, |
| { FC_WIDTH_EXTRACONDENSED, SkFS::kExtraCondensed_Width }, |
| { FC_WIDTH_CONDENSED, SkFS::kCondensed_Width }, |
| { FC_WIDTH_SEMICONDENSED, SkFS::kSemiCondensed_Width }, |
| { FC_WIDTH_NORMAL, SkFS::kNormal_Width }, |
| { FC_WIDTH_SEMIEXPANDED, SkFS::kSemiExpanded_Width }, |
| { FC_WIDTH_EXPANDED, SkFS::kExpanded_Width }, |
| { FC_WIDTH_EXTRAEXPANDED, SkFS::kExtraExpanded_Width }, |
| { FC_WIDTH_ULTRAEXPANDED, SkFS::kUltraExpanded_Width }, |
| }; |
| SkScalar width = map_ranges(get_int(pattern, FC_WIDTH, FC_WIDTH_NORMAL), |
| widthRanges, SK_ARRAY_COUNT(widthRanges)); |
| |
| SkFS::Slant slant = SkFS::kUpright_Slant; |
| switch (get_int(pattern, FC_SLANT, FC_SLANT_ROMAN)) { |
| case FC_SLANT_ROMAN: slant = SkFS::kUpright_Slant; break; |
| case FC_SLANT_ITALIC : slant = SkFS::kItalic_Slant ; break; |
| case FC_SLANT_OBLIQUE: slant = SkFS::kOblique_Slant; break; |
| default: SkASSERT(false); break; |
| } |
| |
| return SkFontStyle(SkScalarRoundToInt(weight), SkScalarRoundToInt(width), slant); |
| } |
| |
| static void fcpattern_from_skfontstyle(SkFontStyle style, FcPattern* pattern) { |
| typedef SkFontStyle SkFS; |
| |
| static constexpr MapRanges weightRanges[] = { |
| { SkFS::kThin_Weight, FC_WEIGHT_THIN }, |
| { SkFS::kExtraLight_Weight, FC_WEIGHT_EXTRALIGHT }, |
| { SkFS::kLight_Weight, FC_WEIGHT_LIGHT }, |
| { 350, FC_WEIGHT_DEMILIGHT }, |
| { 380, FC_WEIGHT_BOOK }, |
| { SkFS::kNormal_Weight, FC_WEIGHT_REGULAR }, |
| { SkFS::kMedium_Weight, FC_WEIGHT_MEDIUM }, |
| { SkFS::kSemiBold_Weight, FC_WEIGHT_DEMIBOLD }, |
| { SkFS::kBold_Weight, FC_WEIGHT_BOLD }, |
| { SkFS::kExtraBold_Weight, FC_WEIGHT_EXTRABOLD }, |
| { SkFS::kBlack_Weight, FC_WEIGHT_BLACK }, |
| { SkFS::kExtraBlack_Weight, FC_WEIGHT_EXTRABLACK }, |
| }; |
| int weight = map_ranges(style.weight(), weightRanges, SK_ARRAY_COUNT(weightRanges)); |
| |
| static constexpr MapRanges widthRanges[] = { |
| { SkFS::kUltraCondensed_Width, FC_WIDTH_ULTRACONDENSED }, |
| { SkFS::kExtraCondensed_Width, FC_WIDTH_EXTRACONDENSED }, |
| { SkFS::kCondensed_Width, FC_WIDTH_CONDENSED }, |
| { SkFS::kSemiCondensed_Width, FC_WIDTH_SEMICONDENSED }, |
| { SkFS::kNormal_Width, FC_WIDTH_NORMAL }, |
| { SkFS::kSemiExpanded_Width, FC_WIDTH_SEMIEXPANDED }, |
| { SkFS::kExpanded_Width, FC_WIDTH_EXPANDED }, |
| { SkFS::kExtraExpanded_Width, FC_WIDTH_EXTRAEXPANDED }, |
| { SkFS::kUltraExpanded_Width, FC_WIDTH_ULTRAEXPANDED }, |
| }; |
| int width = map_ranges(style.width(), widthRanges, SK_ARRAY_COUNT(widthRanges)); |
| |
| int slant = FC_SLANT_ROMAN; |
| switch (style.slant()) { |
| case SkFS::kUpright_Slant: slant = FC_SLANT_ROMAN ; break; |
| case SkFS::kItalic_Slant : slant = FC_SLANT_ITALIC ; break; |
| case SkFS::kOblique_Slant: slant = FC_SLANT_OBLIQUE; break; |
| default: SkASSERT(false); break; |
| } |
| |
| FcPatternAddInteger(pattern, FC_WEIGHT, weight); |
| FcPatternAddInteger(pattern, FC_WIDTH , width); |
| FcPatternAddInteger(pattern, FC_SLANT , slant); |
| } |
| |
| } // anonymous namespace |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #define kMaxFontFamilyLength 2048 |
| #ifdef SK_FONT_CONFIG_INTERFACE_ONLY_ALLOW_SFNT_FONTS |
| const char* kFontFormatTrueType = "TrueType"; |
| const char* kFontFormatCFF = "CFF"; |
| #endif |
| |
| SkFontConfigInterfaceDirect::SkFontConfigInterfaceDirect() { |
| FCLocker lock; |
| |
| FcInit(); |
| |
| SkDEBUGCODE(fontconfiginterface_unittest();) |
| } |
| |
| SkFontConfigInterfaceDirect::~SkFontConfigInterfaceDirect() { |
| } |
| |
| bool SkFontConfigInterfaceDirect::isAccessible(const char* filename) { |
| if (access(filename, R_OK) != 0) { |
| return false; |
| } |
| return true; |
| } |
| |
| bool SkFontConfigInterfaceDirect::isValidPattern(FcPattern* pattern) { |
| #ifdef SK_FONT_CONFIG_INTERFACE_ONLY_ALLOW_SFNT_FONTS |
| const char* font_format = get_string(pattern, FC_FONTFORMAT); |
| if (font_format |
| && strcmp(font_format, kFontFormatTrueType) != 0 |
| && strcmp(font_format, kFontFormatCFF) != 0) |
| { |
| return false; |
| } |
| #endif |
| |
| // fontconfig can also return fonts which are unreadable |
| const char* c_filename = get_string(pattern, FC_FILE); |
| if (!c_filename) { |
| return false; |
| } |
| return this->isAccessible(c_filename); |
| } |
| |
| // Find matching font from |font_set| for the given font family. |
| FcPattern* SkFontConfigInterfaceDirect::MatchFont(FcFontSet* font_set, |
| const char* post_config_family, |
| const SkString& family) { |
| // Older versions of fontconfig have a bug where they cannot select |
| // only scalable fonts so we have to manually filter the results. |
| FcPattern* match = nullptr; |
| for (int i = 0; i < font_set->nfont; ++i) { |
| FcPattern* current = font_set->fonts[i]; |
| if (this->isValidPattern(current)) { |
| match = current; |
| break; |
| } |
| } |
| |
| if (match && !IsFallbackFontAllowed(family)) { |
| bool acceptable_substitute = false; |
| for (int id = 0; id < 255; ++id) { |
| const char* post_match_family = get_string(match, FC_FAMILY, id); |
| if (!post_match_family) |
| break; |
| acceptable_substitute = |
| (strcasecmp(post_config_family, post_match_family) == 0 || |
| // Workaround for Issue 12530: |
| // requested family: "Bitstream Vera Sans" |
| // post_config_family: "Arial" |
| // post_match_family: "Bitstream Vera Sans" |
| // -> We should treat this case as a good match. |
| strcasecmp(family.c_str(), post_match_family) == 0) || |
| IsMetricCompatibleReplacement(family.c_str(), post_match_family); |
| if (acceptable_substitute) |
| break; |
| } |
| if (!acceptable_substitute) |
| return nullptr; |
| } |
| |
| return match; |
| } |
| |
| bool SkFontConfigInterfaceDirect::matchFamilyName(const char familyName[], |
| SkFontStyle style, |
| FontIdentity* outIdentity, |
| SkString* outFamilyName, |
| SkFontStyle* outStyle) { |
| SkString familyStr(familyName ? familyName : ""); |
| if (familyStr.size() > kMaxFontFamilyLength) { |
| return false; |
| } |
| |
| FCLocker lock; |
| |
| FcPattern* pattern = FcPatternCreate(); |
| |
| if (familyName) { |
| FcPatternAddString(pattern, FC_FAMILY, (FcChar8*)familyName); |
| } |
| fcpattern_from_skfontstyle(style, pattern); |
| |
| FcPatternAddBool(pattern, FC_SCALABLE, FcTrue); |
| |
| FcConfigSubstitute(nullptr, pattern, FcMatchPattern); |
| FcDefaultSubstitute(pattern); |
| |
| // Font matching: |
| // CSS often specifies a fallback list of families: |
| // font-family: a, b, c, serif; |
| // However, fontconfig will always do its best to find *a* font when asked |
| // for something so we need a way to tell if the match which it has found is |
| // "good enough" for us. Otherwise, we can return nullptr which gets piped up |
| // and lets WebKit know to try the next CSS family name. However, fontconfig |
| // configs allow substitutions (mapping "Arial -> Helvetica" etc) and we |
| // wish to support that. |
| // |
| // Thus, if a specific family is requested we set @family_requested. Then we |
| // record two strings: the family name after config processing and the |
| // family name after resolving. If the two are equal, it's a good match. |
| // |
| // So consider the case where a user has mapped Arial to Helvetica in their |
| // config. |
| // requested family: "Arial" |
| // post_config_family: "Helvetica" |
| // post_match_family: "Helvetica" |
| // -> good match |
| // |
| // and for a missing font: |
| // requested family: "Monaco" |
| // post_config_family: "Monaco" |
| // post_match_family: "Times New Roman" |
| // -> BAD match |
| // |
| // However, we special-case fallback fonts; see IsFallbackFontAllowed(). |
| |
| const char* post_config_family = get_string(pattern, FC_FAMILY); |
| if (!post_config_family) { |
| // we can just continue with an empty name, e.g. default font |
| post_config_family = ""; |
| } |
| |
| FcResult result; |
| FcFontSet* font_set = FcFontSort(nullptr, pattern, 0, nullptr, &result); |
| if (!font_set) { |
| FcPatternDestroy(pattern); |
| return false; |
| } |
| |
| FcPattern* match = this->MatchFont(font_set, post_config_family, familyStr); |
| if (!match) { |
| FcPatternDestroy(pattern); |
| FcFontSetDestroy(font_set); |
| return false; |
| } |
| |
| FcPatternDestroy(pattern); |
| |
| // From here out we just extract our results from 'match' |
| |
| post_config_family = get_string(match, FC_FAMILY); |
| if (!post_config_family) { |
| FcFontSetDestroy(font_set); |
| return false; |
| } |
| |
| const char* c_filename = get_string(match, FC_FILE); |
| if (!c_filename) { |
| FcFontSetDestroy(font_set); |
| return false; |
| } |
| |
| int face_index = get_int(match, FC_INDEX, 0); |
| |
| FcFontSetDestroy(font_set); |
| |
| if (outIdentity) { |
| outIdentity->fTTCIndex = face_index; |
| outIdentity->fString.set(c_filename); |
| } |
| if (outFamilyName) { |
| outFamilyName->set(post_config_family); |
| } |
| if (outStyle) { |
| *outStyle = skfontstyle_from_fcpattern(match); |
| } |
| return true; |
| } |
| |
| SkStreamAsset* SkFontConfigInterfaceDirect::openStream(const FontIdentity& identity) { |
| return SkStream::MakeFromFile(identity.fString.c_str()).release(); |
| } |