| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkDataTable.h" |
| #include "SkFontDescriptor.h" |
| #include "SkFontHost_FreeType_common.h" |
| #include "SkFontMgr.h" |
| #include "SkFontStyle.h" |
| #include "SkMath.h" |
| #include "SkString.h" |
| #include "SkStream.h" |
| #include "SkTDArray.h" |
| #include "SkThread.h" |
| #include "SkTypefaceCache.h" |
| #include "SkOSFile.h" |
| |
| #include <fontconfig/fontconfig.h> |
| |
| // FC_POSTSCRIPT_NAME was added with b561ff20 which ended up in 2.10.92 |
| // Ubuntu 12.04 is on 2.8.0, 13.10 is on 2.10.93 |
| // Debian 7 is on 2.9.0, 8 is on 2.11 |
| // OpenSUSE 12.2 is on 2.9.0, 12.3 is on 2.10.2, 13.1 2.11.0 |
| // Fedora 19 is on 2.10.93 |
| #ifndef FC_POSTSCRIPT_NAME |
| # define FC_POSTSCRIPT_NAME "postscriptname" |
| #endif |
| |
| #ifdef SK_DEBUG |
| # include "SkTLS.h" |
| #endif |
| |
| /** Since FontConfig is poorly documented, this gives a high level overview: |
| * |
| * FcConfig is a handle to a FontConfig configuration instance. Each 'configuration' is independent |
| * from any others which may exist. There exists a default global configuration which is created |
| * and destroyed by FcInit and FcFini, but this default should not normally be used. |
| * Instead, one should use FcConfigCreate and FcInit* to have a named local state. |
| * |
| * FcPatterns are {objectName -> [element]} (maps from object names to a list of elements). |
| * Each element is some internal data plus an FcValue which is a variant (a union with a type tag). |
| * Lists of elements are not typed, except by convention. Any collection of FcValues must be |
| * assumed to be heterogeneous by the code, but the code need not do anything particularly |
| * interesting if the values go against convention. |
| * |
| * Somewhat like DirectWrite, FontConfig supports synthetics through FC_EMBOLDEN and FC_MATRIX. |
| * Like all synthetic information, such information must be passed with the font data. |
| */ |
| |
| namespace { |
| |
| // Fontconfig is not threadsafe before 2.10.91. Before that, we lock with a global mutex. |
| // See http://skbug.com/1497 for background. |
| SK_DECLARE_STATIC_MUTEX(gFCMutex); |
| |
| #ifdef SK_DEBUG |
| void *CreateThreadFcLocked() { return SkNEW_ARGS(bool, (false)); } |
| void DeleteThreadFcLocked(void* v) { SkDELETE(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 |
| |
| template<typename T, void (*D)(T*)> void FcTDestroy(T* t) { |
| FCLocker::AssertHeld(); |
| D(t); |
| } |
| template <typename T, T* (*C)(), void (*D)(T*)> class SkAutoFc |
| : public SkAutoTCallVProc<T, FcTDestroy<T, D> > { |
| public: |
| SkAutoFc() : SkAutoTCallVProc<T, FcTDestroy<T, D> >(C()) { |
| T* obj = this->operator T*(); |
| SK_ALWAYSBREAK(NULL != obj); |
| } |
| explicit SkAutoFc(T* obj) : SkAutoTCallVProc<T, FcTDestroy<T, D> >(obj) {} |
| }; |
| |
| typedef SkAutoFc<FcCharSet, FcCharSetCreate, FcCharSetDestroy> SkAutoFcCharSet; |
| typedef SkAutoFc<FcConfig, FcConfigCreate, FcConfigDestroy> SkAutoFcConfig; |
| typedef SkAutoFc<FcFontSet, FcFontSetCreate, FcFontSetDestroy> SkAutoFcFontSet; |
| typedef SkAutoFc<FcLangSet, FcLangSetCreate, FcLangSetDestroy> SkAutoFcLangSet; |
| typedef SkAutoFc<FcObjectSet, FcObjectSetCreate, FcObjectSetDestroy> SkAutoFcObjectSet; |
| typedef SkAutoFc<FcPattern, FcPatternCreate, FcPatternDestroy> SkAutoFcPattern; |
| |
| 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 const char* get_string(FcPattern* pattern, const char object[], const char* missing = "") { |
| FcChar8* value; |
| if (FcPatternGetString(pattern, object, 0, &value) != FcResultMatch) { |
| return missing; |
| } |
| return (const char*)value; |
| } |
| |
| enum SkWeakReturn { |
| kIsWeak_WeakReturn, |
| kIsStrong_WeakReturn, |
| kNoId_WeakReturn |
| }; |
| /** Ideally there would exist a call like |
| * FcResult FcPatternIsWeak(pattern, object, id, FcBool* isWeak); |
| * |
| * However, there is no such call and as of Fc 2.11.0 even FcPatternEquals ignores the weak bit. |
| * Currently, the only reliable way of finding the weak bit is by its effect on matching. |
| * The weak bit only affects the matching of FC_FAMILY and FC_POSTSCRIPT_NAME object values. |
| * A element with the weak bit is scored after FC_LANG, without the weak bit is scored before. |
| * Note that the weak bit is stored on the element, not on the value it holds. |
| */ |
| static SkWeakReturn is_weak(FcPattern* pattern, const char object[], int id) { |
| FCLocker::AssertHeld(); |
| |
| FcResult result; |
| |
| // Create a copy of the pattern with only the value 'pattern'['object'['id']] in it. |
| // Internally, FontConfig pattern objects are linked lists, so faster to remove from head. |
| SkAutoFcObjectSet requestedObjectOnly(FcObjectSetBuild(object, NULL)); |
| SkAutoFcPattern minimal(FcPatternFilter(pattern, requestedObjectOnly)); |
| FcBool hasId = true; |
| for (int i = 0; hasId && i < id; ++i) { |
| hasId = FcPatternRemove(minimal, object, 0); |
| } |
| if (!hasId) { |
| return kNoId_WeakReturn; |
| } |
| FcValue value; |
| result = FcPatternGet(minimal, object, 0, &value); |
| if (result != FcResultMatch) { |
| return kNoId_WeakReturn; |
| } |
| while (hasId) { |
| hasId = FcPatternRemove(minimal, object, 1); |
| } |
| |
| // Create a font set with two patterns. |
| // 1. the same 'object' as minimal and a lang object with only 'nomatchlang'. |
| // 2. a different 'object' from minimal and a lang object with only 'matchlang'. |
| SkAutoFcFontSet fontSet; |
| |
| SkAutoFcLangSet strongLangSet; |
| FcLangSetAdd(strongLangSet, (const FcChar8*)"nomatchlang"); |
| SkAutoFcPattern strong(FcPatternDuplicate(minimal)); |
| FcPatternAddLangSet(strong, FC_LANG, strongLangSet); |
| |
| SkAutoFcLangSet weakLangSet; |
| FcLangSetAdd(weakLangSet, (const FcChar8*)"matchlang"); |
| SkAutoFcPattern weak; |
| FcPatternAddString(weak, object, (const FcChar8*)"nomatchstring"); |
| FcPatternAddLangSet(weak, FC_LANG, weakLangSet); |
| |
| FcFontSetAdd(fontSet, strong.detach()); |
| FcFontSetAdd(fontSet, weak.detach()); |
| |
| // Add 'matchlang' to the copy of the pattern. |
| FcPatternAddLangSet(minimal, FC_LANG, weakLangSet); |
| |
| // Run a match against the copy of the pattern. |
| // If the 'id' was weak, then we should match the pattern with 'matchlang'. |
| // If the 'id' was strong, then we should match the pattern with 'nomatchlang'. |
| |
| // Note that this config is only used for FcFontRenderPrepare, which we don't even want. |
| // However, there appears to be no way to match/sort without it. |
| SkAutoFcConfig config; |
| FcFontSet* fontSets[1] = { fontSet }; |
| SkAutoFcPattern match(FcFontSetMatch(config, fontSets, SK_ARRAY_COUNT(fontSets), |
| minimal, &result)); |
| |
| FcLangSet* matchLangSet; |
| FcPatternGetLangSet(match, FC_LANG, 0, &matchLangSet); |
| return FcLangEqual == FcLangSetHasLang(matchLangSet, (const FcChar8*)"matchlang") |
| ? kIsWeak_WeakReturn : kIsStrong_WeakReturn; |
| } |
| |
| /** Removes weak elements from either FC_FAMILY or FC_POSTSCRIPT_NAME objects in the property. |
| * This can be quite expensive, and should not be used more than once per font lookup. |
| * This removes all of the weak elements after the last strong element. |
| */ |
| static void remove_weak(FcPattern* pattern, const char object[]) { |
| FCLocker::AssertHeld(); |
| |
| SkAutoFcObjectSet requestedObjectOnly(FcObjectSetBuild(object, NULL)); |
| SkAutoFcPattern minimal(FcPatternFilter(pattern, requestedObjectOnly)); |
| |
| int lastStrongId = -1; |
| int numIds; |
| SkWeakReturn result; |
| for (int id = 0; ; ++id) { |
| result = is_weak(minimal, object, 0); |
| if (kNoId_WeakReturn == result) { |
| numIds = id; |
| break; |
| } |
| if (kIsStrong_WeakReturn == result) { |
| lastStrongId = id; |
| } |
| SkAssertResult(FcPatternRemove(minimal, object, 0)); |
| } |
| |
| // If they were all weak, then leave the pattern alone. |
| if (lastStrongId < 0) { |
| return; |
| } |
| |
| // Remove everything after the last strong. |
| for (int id = lastStrongId + 1; id < numIds; ++id) { |
| SkAssertResult(FcPatternRemove(pattern, object, lastStrongId + 1)); |
| } |
| } |
| |
| static int map_range(SkFixed value, |
| SkFixed old_min, SkFixed old_max, |
| SkFixed new_min, SkFixed new_max) |
| { |
| SkASSERT(old_min < old_max); |
| SkASSERT(new_min <= new_max); |
| return new_min + SkMulDiv(value - old_min, new_max - new_min, old_max - old_min); |
| } |
| |
| static int ave(SkFixed a, SkFixed b) { |
| return SkFixedAve(a, b); |
| } |
| |
| struct MapRanges { |
| SkFixed old_val; |
| SkFixed new_val; |
| }; |
| |
| static SkFixed map_ranges_fixed(SkFixed val, MapRanges const ranges[], int rangesCount) { |
| // -Inf to [0] |
| if (val < ranges[0].old_val) { |
| return ranges[0].new_val; |
| } |
| |
| // Linear from [i] to ave([i], [i+1]), then from ave([i], [i+1]) to [i+1] |
| for (int i = 0; i < rangesCount - 1; ++i) { |
| if (val < ave(ranges[i].old_val, ranges[i+1].old_val)) { |
| return map_range(val, ranges[i].old_val, ave(ranges[i].old_val, ranges[i+1].old_val), |
| ranges[i].new_val, ave(ranges[i].new_val, ranges[i+1].new_val)); |
| } |
| if (val < ranges[i+1].old_val) { |
| return map_range(val, ave(ranges[i].old_val, ranges[i+1].old_val), ranges[i+1].old_val, |
| ave(ranges[i].new_val, ranges[i+1].new_val), ranges[i+1].new_val); |
| } |
| } |
| |
| // From [n] to +Inf |
| // if (fcweight < Inf) |
| return ranges[rangesCount-1].new_val; |
| } |
| |
| static int map_ranges(int val, MapRanges const ranges[], int rangesCount) { |
| return SkFixedRoundToInt(map_ranges_fixed(SkIntToFixed(val), ranges, rangesCount)); |
| } |
| |
| template<int n> struct SkTFixed { |
| SK_COMPILE_ASSERT(-32768 <= n && n <= 32767, SkTFixed_n_not_in_range); |
| static const SkFixed value = static_cast<SkFixed>(n << 16); |
| }; |
| |
| static SkFontStyle skfontstyle_from_fcpattern(FcPattern* pattern) { |
| typedef SkFontStyle SkFS; |
| |
| static const MapRanges weightRanges[] = { |
| { SkTFixed<FC_WEIGHT_THIN>::value, SkTFixed<SkFS::kThin_Weight>::value }, |
| { SkTFixed<FC_WEIGHT_EXTRALIGHT>::value, SkTFixed<SkFS::kExtraLight_Weight>::value }, |
| { SkTFixed<FC_WEIGHT_LIGHT>::value, SkTFixed<SkFS::kLight_Weight>::value }, |
| { SkTFixed<FC_WEIGHT_REGULAR>::value, SkTFixed<SkFS::kNormal_Weight>::value }, |
| { SkTFixed<FC_WEIGHT_MEDIUM>::value, SkTFixed<SkFS::kMedium_Weight>::value }, |
| { SkTFixed<FC_WEIGHT_DEMIBOLD>::value, SkTFixed<SkFS::kSemiBold_Weight>::value }, |
| { SkTFixed<FC_WEIGHT_BOLD>::value, SkTFixed<SkFS::kBold_Weight>::value }, |
| { SkTFixed<FC_WEIGHT_EXTRABOLD>::value, SkTFixed<SkFS::kExtraBold_Weight>::value }, |
| { SkTFixed<FC_WEIGHT_BLACK>::value, SkTFixed<SkFS::kBlack_Weight>::value }, |
| { SkTFixed<FC_WEIGHT_EXTRABLACK>::value, SkTFixed<1000>::value }, |
| }; |
| int weight = map_ranges(get_int(pattern, FC_WEIGHT, FC_WEIGHT_REGULAR), |
| weightRanges, SK_ARRAY_COUNT(weightRanges)); |
| |
| static const MapRanges widthRanges[] = { |
| { SkTFixed<FC_WIDTH_ULTRACONDENSED>::value, SkTFixed<SkFS::kUltraCondensed_Width>::value }, |
| { SkTFixed<FC_WIDTH_EXTRACONDENSED>::value, SkTFixed<SkFS::kExtraCondensed_Width>::value }, |
| { SkTFixed<FC_WIDTH_CONDENSED>::value, SkTFixed<SkFS::kCondensed_Width>::value }, |
| { SkTFixed<FC_WIDTH_SEMICONDENSED>::value, SkTFixed<SkFS::kSemiCondensed_Width>::value }, |
| { SkTFixed<FC_WIDTH_NORMAL>::value, SkTFixed<SkFS::kNormal_Width>::value }, |
| { SkTFixed<FC_WIDTH_SEMIEXPANDED>::value, SkTFixed<SkFS::kSemiExpanded_Width>::value }, |
| { SkTFixed<FC_WIDTH_EXPANDED>::value, SkTFixed<SkFS::kExpanded_Width>::value }, |
| { SkTFixed<FC_WIDTH_EXTRAEXPANDED>::value, SkTFixed<SkFS::kExtraExpanded_Width>::value }, |
| { SkTFixed<FC_WIDTH_ULTRAEXPANDED>::value, SkTFixed<SkFS::kUltaExpanded_Width>::value }, |
| }; |
| int width = map_ranges(get_int(pattern, FC_WIDTH, FC_WIDTH_NORMAL), |
| widthRanges, SK_ARRAY_COUNT(widthRanges)); |
| |
| SkFS::Slant slant = get_int(pattern, FC_SLANT, FC_SLANT_ROMAN) > 0 |
| ? SkFS::kItalic_Slant |
| : SkFS::kUpright_Slant; |
| |
| return SkFontStyle(weight, width, slant); |
| } |
| |
| static void fcpattern_from_skfontstyle(SkFontStyle style, FcPattern* pattern) { |
| FCLocker::AssertHeld(); |
| |
| typedef SkFontStyle SkFS; |
| |
| static const MapRanges weightRanges[] = { |
| { SkTFixed<SkFS::kThin_Weight>::value, SkTFixed<FC_WEIGHT_THIN>::value }, |
| { SkTFixed<SkFS::kExtraLight_Weight>::value, SkTFixed<FC_WEIGHT_EXTRALIGHT>::value }, |
| { SkTFixed<SkFS::kLight_Weight>::value, SkTFixed<FC_WEIGHT_LIGHT>::value }, |
| { SkTFixed<SkFS::kNormal_Weight>::value, SkTFixed<FC_WEIGHT_REGULAR>::value }, |
| { SkTFixed<SkFS::kMedium_Weight>::value, SkTFixed<FC_WEIGHT_MEDIUM>::value }, |
| { SkTFixed<SkFS::kSemiBold_Weight>::value, SkTFixed<FC_WEIGHT_DEMIBOLD>::value }, |
| { SkTFixed<SkFS::kBold_Weight>::value, SkTFixed<FC_WEIGHT_BOLD>::value }, |
| { SkTFixed<SkFS::kExtraBold_Weight>::value, SkTFixed<FC_WEIGHT_EXTRABOLD>::value }, |
| { SkTFixed<SkFS::kBlack_Weight>::value, SkTFixed<FC_WEIGHT_BLACK>::value }, |
| { SkTFixed<1000>::value, SkTFixed<FC_WEIGHT_EXTRABLACK>::value }, |
| }; |
| int weight = map_ranges(style.weight(), weightRanges, SK_ARRAY_COUNT(weightRanges)); |
| |
| static const MapRanges widthRanges[] = { |
| { SkTFixed<SkFS::kUltraCondensed_Width>::value, SkTFixed<FC_WIDTH_ULTRACONDENSED>::value }, |
| { SkTFixed<SkFS::kExtraCondensed_Width>::value, SkTFixed<FC_WIDTH_EXTRACONDENSED>::value }, |
| { SkTFixed<SkFS::kCondensed_Width>::value, SkTFixed<FC_WIDTH_CONDENSED>::value }, |
| { SkTFixed<SkFS::kSemiCondensed_Width>::value, SkTFixed<FC_WIDTH_SEMICONDENSED>::value }, |
| { SkTFixed<SkFS::kNormal_Width>::value, SkTFixed<FC_WIDTH_NORMAL>::value }, |
| { SkTFixed<SkFS::kSemiExpanded_Width>::value, SkTFixed<FC_WIDTH_SEMIEXPANDED>::value }, |
| { SkTFixed<SkFS::kExpanded_Width>::value, SkTFixed<FC_WIDTH_EXPANDED>::value }, |
| { SkTFixed<SkFS::kExtraExpanded_Width>::value, SkTFixed<FC_WIDTH_EXTRAEXPANDED>::value }, |
| { SkTFixed<SkFS::kUltaExpanded_Width>::value, SkTFixed<FC_WIDTH_ULTRAEXPANDED>::value }, |
| }; |
| int width = map_ranges(style.width(), widthRanges, SK_ARRAY_COUNT(widthRanges)); |
| |
| FcPatternAddInteger(pattern, FC_WEIGHT, weight); |
| FcPatternAddInteger(pattern, FC_WIDTH, width); |
| FcPatternAddInteger(pattern, FC_SLANT, style.isItalic() ? FC_SLANT_ITALIC : FC_SLANT_ROMAN); |
| } |
| |
| class SkTypeface_stream : public SkTypeface_FreeType { |
| public: |
| /** @param data takes ownership of the font data.*/ |
| SkTypeface_stream(SkFontData* data, const SkFontStyle& style, bool fixedWidth) |
| : INHERITED(style, SkTypefaceCache::NewFontID(), fixedWidth) |
| , fData(data) |
| { }; |
| |
| void onGetFamilyName(SkString* familyName) const override { |
| familyName->reset(); |
| } |
| |
| void onGetFontDescriptor(SkFontDescriptor* desc, bool* serialize) const override { |
| *serialize = true; |
| } |
| |
| SkStreamAsset* onOpenStream(int* ttcIndex) const override { |
| *ttcIndex = fData->getIndex(); |
| return fData->duplicateStream(); |
| } |
| |
| SkFontData* onCreateFontData() const override { |
| return new SkFontData(*fData.get()); |
| } |
| |
| private: |
| const SkAutoTDelete<const SkFontData> fData; |
| |
| typedef SkTypeface_FreeType INHERITED; |
| }; |
| |
| class SkTypeface_fontconfig : public SkTypeface_FreeType { |
| public: |
| /** @param pattern takes ownership of the reference. */ |
| static SkTypeface_fontconfig* Create(FcPattern* pattern) { |
| return SkNEW_ARGS(SkTypeface_fontconfig, (pattern)); |
| } |
| mutable SkAutoFcPattern fPattern; |
| |
| void onGetFamilyName(SkString* familyName) const override { |
| *familyName = get_string(fPattern, FC_FAMILY); |
| } |
| |
| void onGetFontDescriptor(SkFontDescriptor* desc, bool* serialize) const override { |
| FCLocker lock; |
| desc->setFamilyName(get_string(fPattern, FC_FAMILY)); |
| desc->setFullName(get_string(fPattern, FC_FULLNAME)); |
| desc->setPostscriptName(get_string(fPattern, FC_POSTSCRIPT_NAME)); |
| *serialize = false; |
| } |
| |
| SkStreamAsset* onOpenStream(int* ttcIndex) const override { |
| FCLocker lock; |
| *ttcIndex = get_int(fPattern, FC_INDEX, 0); |
| return SkStream::NewFromFile(get_string(fPattern, FC_FILE)); |
| } |
| |
| virtual ~SkTypeface_fontconfig() { |
| // Hold the lock while unrefing the pattern. |
| FCLocker lock; |
| fPattern.reset(); |
| } |
| |
| private: |
| /** @param pattern takes ownership of the reference. */ |
| SkTypeface_fontconfig(FcPattern* pattern) |
| : INHERITED(skfontstyle_from_fcpattern(pattern), |
| SkTypefaceCache::NewFontID(), |
| FC_PROPORTIONAL != get_int(pattern, FC_SPACING, FC_PROPORTIONAL)) |
| , fPattern(pattern) |
| { }; |
| |
| typedef SkTypeface_FreeType INHERITED; |
| }; |
| |
| class SkFontMgr_fontconfig : public SkFontMgr { |
| mutable SkAutoFcConfig fFC; |
| SkAutoTUnref<SkDataTable> fFamilyNames; |
| SkTypeface_FreeType::Scanner fScanner; |
| |
| class StyleSet : public SkFontStyleSet { |
| public: |
| /** @param parent does not take ownership of the reference. |
| * @param fontSet takes ownership of the reference. |
| */ |
| StyleSet(const SkFontMgr_fontconfig* parent, FcFontSet* fontSet) |
| : fFontMgr(SkRef(parent)), fFontSet(fontSet) |
| { } |
| |
| virtual ~StyleSet() { |
| // Hold the lock while unrefing the font set. |
| FCLocker lock; |
| fFontSet.reset(); |
| } |
| |
| int count() override { return fFontSet->nfont; } |
| |
| void getStyle(int index, SkFontStyle* style, SkString* styleName) override { |
| if (index < 0 || fFontSet->nfont <= index) { |
| return; |
| } |
| |
| FCLocker lock; |
| if (style) { |
| *style = skfontstyle_from_fcpattern(fFontSet->fonts[index]); |
| } |
| if (styleName) { |
| *styleName = get_string(fFontSet->fonts[index], FC_STYLE); |
| } |
| } |
| |
| SkTypeface* createTypeface(int index) override { |
| FCLocker lock; |
| |
| FcPattern* match = fFontSet->fonts[index]; |
| return fFontMgr->createTypefaceFromFcPattern(match); |
| } |
| |
| SkTypeface* matchStyle(const SkFontStyle& style) override { |
| FCLocker lock; |
| |
| SkAutoFcPattern pattern; |
| fcpattern_from_skfontstyle(style, pattern); |
| FcConfigSubstitute(fFontMgr->fFC, pattern, FcMatchPattern); |
| FcDefaultSubstitute(pattern); |
| |
| FcResult result; |
| FcFontSet* fontSets[1] = { fFontSet }; |
| SkAutoFcPattern match(FcFontSetMatch(fFontMgr->fFC, |
| fontSets, SK_ARRAY_COUNT(fontSets), |
| pattern, &result)); |
| if (NULL == match) { |
| return NULL; |
| } |
| |
| return fFontMgr->createTypefaceFromFcPattern(match); |
| } |
| |
| private: |
| SkAutoTUnref<const SkFontMgr_fontconfig> fFontMgr; |
| SkAutoFcFontSet fFontSet; |
| }; |
| |
| static bool FindName(const SkTDArray<const char*>& list, const char* str) { |
| int count = list.count(); |
| for (int i = 0; i < count; ++i) { |
| if (!strcmp(list[i], str)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| static SkDataTable* GetFamilyNames(FcConfig* fcconfig) { |
| FCLocker lock; |
| |
| SkTDArray<const char*> names; |
| SkTDArray<size_t> sizes; |
| |
| static const FcSetName fcNameSet[] = { FcSetSystem, FcSetApplication }; |
| for (int setIndex = 0; setIndex < (int)SK_ARRAY_COUNT(fcNameSet); ++setIndex) { |
| // Return value of FcConfigGetFonts must not be destroyed. |
| FcFontSet* allFonts(FcConfigGetFonts(fcconfig, fcNameSet[setIndex])); |
| if (NULL == allFonts) { |
| continue; |
| } |
| |
| for (int fontIndex = 0; fontIndex < allFonts->nfont; ++fontIndex) { |
| FcPattern* current = allFonts->fonts[fontIndex]; |
| for (int id = 0; ; ++id) { |
| FcChar8* fcFamilyName; |
| FcResult result = FcPatternGetString(current, FC_FAMILY, id, &fcFamilyName); |
| if (FcResultNoId == result) { |
| break; |
| } |
| if (FcResultMatch != result) { |
| continue; |
| } |
| const char* familyName = reinterpret_cast<const char*>(fcFamilyName); |
| if (familyName && !FindName(names, familyName)) { |
| *names.append() = familyName; |
| *sizes.append() = strlen(familyName) + 1; |
| } |
| } |
| } |
| } |
| |
| return SkDataTable::NewCopyArrays((void const *const *)names.begin(), |
| sizes.begin(), names.count()); |
| } |
| |
| static bool FindByFcPattern(SkTypeface* cached, const SkFontStyle&, void* ctx) { |
| SkTypeface_fontconfig* cshFace = static_cast<SkTypeface_fontconfig*>(cached); |
| FcPattern* ctxPattern = static_cast<FcPattern*>(ctx); |
| return FcTrue == FcPatternEqual(cshFace->fPattern, ctxPattern); |
| } |
| |
| mutable SkMutex fTFCacheMutex; |
| mutable SkTypefaceCache fTFCache; |
| /** Creates a typeface using a typeface cache. |
| * @param pattern a complete pattern from FcFontRenderPrepare. |
| */ |
| SkTypeface* createTypefaceFromFcPattern(FcPattern* pattern) const { |
| FCLocker::AssertHeld(); |
| SkAutoMutexAcquire ama(fTFCacheMutex); |
| SkTypeface* face = fTFCache.findByProcAndRef(FindByFcPattern, pattern); |
| if (NULL == face) { |
| FcPatternReference(pattern); |
| face = SkTypeface_fontconfig::Create(pattern); |
| if (face) { |
| fTFCache.add(face, SkFontStyle()); |
| } |
| } |
| return face; |
| } |
| |
| public: |
| SkFontMgr_fontconfig() |
| : fFC(FcInitLoadConfigAndFonts()) |
| , fFamilyNames(GetFamilyNames(fFC)) { } |
| |
| /** Takes control of the reference to 'config'. */ |
| explicit SkFontMgr_fontconfig(FcConfig* config) |
| : fFC(config) |
| , fFamilyNames(GetFamilyNames(fFC)) { } |
| |
| virtual ~SkFontMgr_fontconfig() { |
| // Hold the lock while unrefing the config. |
| FCLocker lock; |
| fFC.reset(); |
| } |
| |
| protected: |
| int onCountFamilies() const override { |
| return fFamilyNames->count(); |
| } |
| |
| void onGetFamilyName(int index, SkString* familyName) const override { |
| familyName->set(fFamilyNames->atStr(index)); |
| } |
| |
| SkFontStyleSet* onCreateStyleSet(int index) const override { |
| return this->onMatchFamily(fFamilyNames->atStr(index)); |
| } |
| |
| /** True if any string object value in the font is the same |
| * as a string object value in the pattern. |
| */ |
| static bool AnyMatching(FcPattern* font, FcPattern* pattern, const char* object) { |
| FcChar8* fontString; |
| FcChar8* patternString; |
| FcResult result; |
| // Set an arbitrary limit on the number of pattern object values to consider. |
| // TODO: re-write this to avoid N*M |
| static const int maxId = 16; |
| for (int patternId = 0; patternId < maxId; ++patternId) { |
| result = FcPatternGetString(pattern, object, patternId, &patternString); |
| if (FcResultNoId == result) { |
| break; |
| } |
| if (FcResultMatch != result) { |
| continue; |
| } |
| for (int fontId = 0; fontId < maxId; ++fontId) { |
| result = FcPatternGetString(font, object, fontId, &fontString); |
| if (FcResultNoId == result) { |
| break; |
| } |
| if (FcResultMatch != result) { |
| continue; |
| } |
| if (0 == FcStrCmpIgnoreCase(patternString, fontString)) { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| static bool FontAccessible(FcPattern* font) { |
| // FontConfig can return fonts which are unreadable. |
| const char* filename = get_string(font, FC_FILE, NULL); |
| if (NULL == filename) { |
| return false; |
| } |
| return sk_exists(filename, kRead_SkFILE_Flag); |
| } |
| |
| static bool FontFamilyNameMatches(FcPattern* font, FcPattern* pattern) { |
| return AnyMatching(font, pattern, FC_FAMILY); |
| } |
| |
| static bool FontContainsCharacter(FcPattern* font, uint32_t character) { |
| FcResult result; |
| FcCharSet* matchCharSet; |
| for (int charSetId = 0; ; ++charSetId) { |
| result = FcPatternGetCharSet(font, FC_CHARSET, charSetId, &matchCharSet); |
| if (FcResultNoId == result) { |
| break; |
| } |
| if (FcResultMatch != result) { |
| continue; |
| } |
| if (FcCharSetHasChar(matchCharSet, character)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| SkFontStyleSet* onMatchFamily(const char familyName[]) const override { |
| FCLocker lock; |
| |
| SkAutoFcPattern pattern; |
| FcPatternAddString(pattern, FC_FAMILY, (FcChar8*)familyName); |
| FcConfigSubstitute(fFC, pattern, FcMatchPattern); |
| FcDefaultSubstitute(pattern); |
| |
| FcPattern* matchPattern; |
| SkAutoFcPattern strongPattern(NULL); |
| if (familyName) { |
| strongPattern.reset(FcPatternDuplicate(pattern)); |
| remove_weak(strongPattern, FC_FAMILY); |
| matchPattern = strongPattern; |
| } else { |
| matchPattern = pattern; |
| } |
| |
| SkAutoFcFontSet matches; |
| // TODO: Some families have 'duplicates' due to symbolic links. |
| // The patterns are exactly the same except for the FC_FILE. |
| // It should be possible to collapse these patterns by normalizing. |
| static const FcSetName fcNameSet[] = { FcSetSystem, FcSetApplication }; |
| for (int setIndex = 0; setIndex < (int)SK_ARRAY_COUNT(fcNameSet); ++setIndex) { |
| // Return value of FcConfigGetFonts must not be destroyed. |
| FcFontSet* allFonts(FcConfigGetFonts(fFC, fcNameSet[setIndex])); |
| if (NULL == allFonts) { |
| continue; |
| } |
| |
| for (int fontIndex = 0; fontIndex < allFonts->nfont; ++fontIndex) { |
| FcPattern* font = allFonts->fonts[fontIndex]; |
| if (FontAccessible(font) && FontFamilyNameMatches(font, matchPattern)) { |
| FcFontSetAdd(matches, FcFontRenderPrepare(fFC, pattern, font)); |
| } |
| } |
| } |
| |
| return SkNEW_ARGS(StyleSet, (this, matches.detach())); |
| } |
| |
| virtual SkTypeface* onMatchFamilyStyle(const char familyName[], |
| const SkFontStyle& style) const override |
| { |
| FCLocker lock; |
| |
| SkAutoFcPattern pattern; |
| FcPatternAddString(pattern, FC_FAMILY, (FcChar8*)familyName); |
| fcpattern_from_skfontstyle(style, pattern); |
| FcConfigSubstitute(fFC, pattern, FcMatchPattern); |
| FcDefaultSubstitute(pattern); |
| |
| // We really want to match strong (prefered) and same (acceptable) only here. |
| // If a family name was specified, assume that any weak matches after the last strong match |
| // are weak (default) and ignore them. |
| // The reason for is that after substitution the pattern for 'sans-serif' looks like |
| // "wwwwwwwwwwwwwwswww" where there are many weak but preferred names, followed by defaults. |
| // So it is possible to have weakly matching but preferred names. |
| // In aliases, bindings are weak by default, so this is easy and common. |
| // If no family name was specified, we'll probably only get weak matches, but that's ok. |
| FcPattern* matchPattern; |
| SkAutoFcPattern strongPattern(NULL); |
| if (familyName) { |
| strongPattern.reset(FcPatternDuplicate(pattern)); |
| remove_weak(strongPattern, FC_FAMILY); |
| matchPattern = strongPattern; |
| } else { |
| matchPattern = pattern; |
| } |
| |
| FcResult result; |
| SkAutoFcPattern font(FcFontMatch(fFC, pattern, &result)); |
| if (NULL == font || !FontAccessible(font) || !FontFamilyNameMatches(font, matchPattern)) { |
| return NULL; |
| } |
| |
| return createTypefaceFromFcPattern(font); |
| } |
| |
| virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], |
| const SkFontStyle& style, |
| const char* bcp47[], |
| int bcp47Count, |
| SkUnichar character) const override |
| { |
| FCLocker lock; |
| |
| SkAutoFcPattern pattern; |
| if (familyName) { |
| FcValue familyNameValue; |
| familyNameValue.type = FcTypeString; |
| familyNameValue.u.s = reinterpret_cast<const FcChar8*>(familyName); |
| FcPatternAddWeak(pattern, FC_FAMILY, familyNameValue, FcFalse); |
| } |
| fcpattern_from_skfontstyle(style, pattern); |
| |
| SkAutoFcCharSet charSet; |
| FcCharSetAddChar(charSet, character); |
| FcPatternAddCharSet(pattern, FC_CHARSET, charSet); |
| |
| if (bcp47Count > 0) { |
| SkASSERT(bcp47); |
| SkAutoFcLangSet langSet; |
| for (int i = bcp47Count; i --> 0;) { |
| FcLangSetAdd(langSet, (const FcChar8*)bcp47[i]); |
| } |
| FcPatternAddLangSet(pattern, FC_LANG, langSet); |
| } |
| |
| FcConfigSubstitute(fFC, pattern, FcMatchPattern); |
| FcDefaultSubstitute(pattern); |
| |
| FcResult result; |
| SkAutoFcPattern font(FcFontMatch(fFC, pattern, &result)); |
| if (NULL == font || !FontAccessible(font) || !FontContainsCharacter(font, character)) { |
| return NULL; |
| } |
| |
| return createTypefaceFromFcPattern(font); |
| } |
| |
| virtual SkTypeface* onMatchFaceStyle(const SkTypeface* typeface, |
| const SkFontStyle& style) const override |
| { |
| //TODO: should the SkTypeface_fontconfig know its family? |
| const SkTypeface_fontconfig* fcTypeface = |
| static_cast<const SkTypeface_fontconfig*>(typeface); |
| return this->matchFamilyStyle(get_string(fcTypeface->fPattern, FC_FAMILY), style); |
| } |
| |
| SkTypeface* onCreateFromStream(SkStreamAsset* bareStream, int ttcIndex) const override { |
| SkAutoTDelete<SkStreamAsset> stream(bareStream); |
| const size_t length = stream->getLength(); |
| if (length <= 0 || (1u << 30) < length) { |
| return NULL; |
| } |
| |
| SkFontStyle style; |
| bool isFixedWidth = false; |
| if (!fScanner.scanFont(stream, ttcIndex, NULL, &style, &isFixedWidth, NULL)) { |
| return NULL; |
| } |
| |
| return SkNEW_ARGS(SkTypeface_stream, (new SkFontData(stream.detach(), ttcIndex, NULL, 0), |
| style, isFixedWidth)); |
| } |
| |
| SkTypeface* onCreateFromData(SkData* data, int ttcIndex) const override { |
| return this->createFromStream(SkNEW_ARGS(SkMemoryStream, (data)), ttcIndex); |
| } |
| |
| SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const override { |
| return this->createFromStream(SkStream::NewFromFile(path), ttcIndex); |
| } |
| |
| SkTypeface* onCreateFromFontData(SkFontData* fontData) const override { |
| SkStreamAsset* stream(fontData->getStream()); |
| const size_t length = stream->getLength(); |
| if (length <= 0 || (1u << 30) < length) { |
| return NULL; |
| } |
| |
| const int ttcIndex = fontData->getIndex(); |
| SkFontStyle style; |
| bool isFixedWidth = false; |
| if (!fScanner.scanFont(stream, ttcIndex, NULL, &style, &isFixedWidth, NULL)) { |
| return NULL; |
| } |
| |
| return SkNEW_ARGS(SkTypeface_stream, (fontData, style, isFixedWidth)); |
| } |
| |
| virtual SkTypeface* onLegacyCreateTypeface(const char familyName[], |
| unsigned styleBits) const override { |
| bool bold = styleBits & SkTypeface::kBold; |
| bool italic = styleBits & SkTypeface::kItalic; |
| SkFontStyle style = SkFontStyle(bold ? SkFontStyle::kBold_Weight |
| : SkFontStyle::kNormal_Weight, |
| SkFontStyle::kNormal_Width, |
| italic ? SkFontStyle::kItalic_Slant |
| : SkFontStyle::kUpright_Slant); |
| SkAutoTUnref<SkTypeface> typeface(this->matchFamilyStyle(familyName, style)); |
| if (typeface.get()) { |
| return typeface.detach(); |
| } |
| |
| return this->matchFamilyStyle(NULL, style); |
| } |
| }; |
| |
| SkFontMgr* SkFontMgr::Factory() { |
| return SkNEW(SkFontMgr_fontconfig); |
| } |
