| /* |
| * 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 "SkFixed.h" |
| #include "SkFontDescriptor.h" |
| #include "SkFontHost_FreeType_common.h" |
| #include "SkFontMgr.h" |
| #include "SkFontMgr_android.h" |
| #include "SkFontMgr_android_parser.h" |
| #include "SkFontStyle.h" |
| #include "SkPaint.h" |
| #include "SkRefCnt.h" |
| #include "SkString.h" |
| #include "SkStream.h" |
| #include "SkTArray.h" |
| #include "SkTDArray.h" |
| #include "SkTSearch.h" |
| #include "SkTemplates.h" |
| #include "SkTypefaceCache.h" |
| |
| #include <limits> |
| |
| class SkData; |
| |
| class SkTypeface_Android : public SkTypeface_FreeType { |
| public: |
| SkTypeface_Android(const SkFontStyle& style, |
| bool isFixedPitch, |
| const SkString& familyName) |
| : INHERITED(style, SkTypefaceCache::NewFontID(), isFixedPitch) |
| , fFamilyName(familyName) |
| { } |
| |
| protected: |
| void onGetFamilyName(SkString* familyName) const override { |
| *familyName = fFamilyName; |
| } |
| |
| SkString fFamilyName; |
| |
| private: |
| typedef SkTypeface_FreeType INHERITED; |
| }; |
| |
| class SkTypeface_AndroidSystem : public SkTypeface_Android { |
| public: |
| SkTypeface_AndroidSystem(const SkString& pathName, |
| int index, |
| const SkFixed* axes, int axesCount, |
| const SkFontStyle& style, |
| bool isFixedPitch, |
| const SkString& familyName, |
| const SkLanguage& lang, |
| FontVariant variantStyle) |
| : INHERITED(style, isFixedPitch, familyName) |
| , fPathName(pathName) |
| , fIndex(index) |
| , fAxes(axes, axesCount) |
| , fLang(lang) |
| , fVariantStyle(variantStyle) { } |
| |
| virtual void onGetFontDescriptor(SkFontDescriptor* desc, bool* serialize) const override { |
| SkASSERT(desc); |
| SkASSERT(serialize); |
| desc->setFamilyName(fFamilyName.c_str()); |
| *serialize = false; |
| } |
| SkStreamAsset* onOpenStream(int* ttcIndex) const override { |
| *ttcIndex = fIndex; |
| return SkStream::NewFromFile(fPathName.c_str()); |
| } |
| SkFontData* onCreateFontData() const override { |
| return new SkFontData(SkStream::NewFromFile(fPathName.c_str()), fIndex, |
| fAxes.begin(), fAxes.count()); |
| } |
| |
| const SkString fPathName; |
| int fIndex; |
| const SkSTArray<4, SkFixed, true> fAxes; |
| const SkLanguage fLang; |
| const FontVariant fVariantStyle; |
| |
| typedef SkTypeface_Android INHERITED; |
| }; |
| |
| class SkTypeface_AndroidStream : public SkTypeface_Android { |
| public: |
| SkTypeface_AndroidStream(SkFontData* data, |
| const SkFontStyle& style, |
| bool isFixedPitch, |
| const SkString& familyName) |
| : INHERITED(style, isFixedPitch, familyName) |
| , fData(data) |
| { } |
| |
| virtual void onGetFontDescriptor(SkFontDescriptor* desc, |
| bool* serialize) const override { |
| SkASSERT(desc); |
| SkASSERT(serialize); |
| desc->setFamilyName(fFamilyName.c_str()); |
| *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_Android INHERITED; |
| }; |
| |
| class SkFontStyleSet_Android : public SkFontStyleSet { |
| typedef SkTypeface_FreeType::Scanner Scanner; |
| |
| public: |
| explicit SkFontStyleSet_Android(const FontFamily& family, const Scanner& scanner) { |
| const SkString* cannonicalFamilyName = NULL; |
| if (family.fNames.count() > 0) { |
| cannonicalFamilyName = &family.fNames[0]; |
| } |
| // TODO? make this lazy |
| for (int i = 0; i < family.fFonts.count(); ++i) { |
| const FontFileInfo& fontFile = family.fFonts[i]; |
| |
| SkString pathName(family.fBasePath); |
| pathName.append(fontFile.fFileName); |
| |
| SkAutoTDelete<SkStream> stream(SkStream::NewFromFile(pathName.c_str())); |
| if (!stream.get()) { |
| SkDEBUGF(("Requested font file %s does not exist or cannot be opened.\n", |
| pathName.c_str())); |
| continue; |
| } |
| |
| const int ttcIndex = fontFile.fIndex; |
| SkString familyName; |
| SkFontStyle style; |
| bool isFixedWidth; |
| Scanner::AxisDefinitions axisDefinitions; |
| if (!scanner.scanFont(stream.get(), ttcIndex, |
| &familyName, &style, &isFixedWidth, &axisDefinitions)) |
| { |
| SkDEBUGF(("Requested font file %s exists, but is not a valid font.\n", |
| pathName.c_str())); |
| continue; |
| } |
| |
| int weight = fontFile.fWeight != 0 ? fontFile.fWeight : style.weight(); |
| SkFontStyle::Slant slant = style.slant(); |
| switch (fontFile.fStyle) { |
| case FontFileInfo::Style::kAuto: slant = style.slant(); break; |
| case FontFileInfo::Style::kNormal: slant = SkFontStyle::kUpright_Slant; break; |
| case FontFileInfo::Style::kItalic: slant = SkFontStyle::kItalic_Slant; break; |
| default: SkASSERT(false); break; |
| } |
| style = SkFontStyle(weight, style.width(), slant); |
| |
| const SkLanguage& lang = family.fLanguage; |
| uint32_t variant = family.fVariant; |
| if (kDefault_FontVariant == variant) { |
| variant = kCompact_FontVariant | kElegant_FontVariant; |
| } |
| |
| // The first specified family name overrides the family name found in the font. |
| // TODO: SkTypeface_AndroidSystem::onCreateFamilyNameIterator should return |
| // all of the specified family names in addition to the names found in the font. |
| if (cannonicalFamilyName != NULL) { |
| familyName = *cannonicalFamilyName; |
| } |
| |
| SkAutoSTMalloc<4, SkFixed> axisValues(axisDefinitions.count()); |
| for (int i = 0; i < axisDefinitions.count(); ++i) { |
| const Scanner::AxisDefinition& axisDefinition = axisDefinitions[i]; |
| axisValues[i] = axisDefinition.fDefault; |
| for (int j = 0; j < fontFile.fAxes.count(); ++j) { |
| const FontFileInfo::Axis& axisSpecified = fontFile.fAxes[j]; |
| if (axisDefinition.fTag == axisSpecified.fTag) { |
| axisValues[i] = SkTPin(axisSpecified.fValue, axisDefinition.fMinimum, |
| axisDefinition.fMaximum); |
| if (axisValues[i] != axisSpecified.fValue) { |
| SkDEBUGF(("Requested font axis value out of range: " |
| "%s '%c%c%c%c' %f; pinned to %f.\n", |
| familyName.c_str(), |
| (axisDefinition.fTag >> 24) & 0xFF, |
| (axisDefinition.fTag >> 16) & 0xFF, |
| (axisDefinition.fTag >> 8) & 0xFF, |
| (axisDefinition.fTag ) & 0xFF, |
| SkFixedToDouble(axisSpecified.fValue), |
| SkFixedToDouble(axisValues[i]))); |
| } |
| break; |
| } |
| } |
| // TODO: warn on defaulted axis? |
| } |
| |
| SkDEBUGCODE ( |
| // Check for axis specified, but not matched in font. |
| for (int i = 0; i < fontFile.fAxes.count(); ++i) { |
| SkFourByteTag skTag = fontFile.fAxes[i].fTag; |
| bool found = false; |
| for (int j = 0; j < axisDefinitions.count(); ++j) { |
| if (skTag == axisDefinitions[j].fTag) { |
| found = true; |
| break; |
| } |
| } |
| if (!found) { |
| SkDEBUGF(("Requested font axis not found: %s '%c%c%c%c'\n", |
| familyName.c_str(), |
| (skTag >> 24) & 0xFF, |
| (skTag >> 16) & 0xFF, |
| (skTag >> 8) & 0xFF, |
| (skTag ) & 0xFF)); |
| } |
| } |
| ) |
| |
| fStyles.push_back().reset(SkNEW_ARGS(SkTypeface_AndroidSystem, |
| (pathName, ttcIndex, |
| axisValues.get(), axisDefinitions.count(), |
| style, isFixedWidth, familyName, |
| lang, variant))); |
| } |
| } |
| |
| int count() override { |
| return fStyles.count(); |
| } |
| void getStyle(int index, SkFontStyle* style, SkString* name) override { |
| if (index < 0 || fStyles.count() <= index) { |
| return; |
| } |
| if (style) { |
| *style = this->style(index); |
| } |
| if (name) { |
| name->reset(); |
| } |
| } |
| SkTypeface_AndroidSystem* createTypeface(int index) override { |
| if (index < 0 || fStyles.count() <= index) { |
| return NULL; |
| } |
| return SkRef(fStyles[index].get()); |
| } |
| |
| /** Find the typeface in this style set that most closely matches the given pattern. |
| * TODO: consider replacing with SkStyleSet_Indirect::matchStyle(); |
| * this simpler version using match_score() passes all our tests. |
| */ |
| SkTypeface_AndroidSystem* matchStyle(const SkFontStyle& pattern) override { |
| if (0 == fStyles.count()) { |
| return NULL; |
| } |
| SkTypeface_AndroidSystem* closest = fStyles[0]; |
| int minScore = std::numeric_limits<int>::max(); |
| for (int i = 0; i < fStyles.count(); ++i) { |
| SkFontStyle style = this->style(i); |
| int score = match_score(pattern, style); |
| if (score < minScore) { |
| closest = fStyles[i]; |
| minScore = score; |
| } |
| } |
| return SkRef(closest); |
| } |
| |
| private: |
| SkFontStyle style(int index) { |
| return fStyles[index]->fontStyle(); |
| } |
| static int match_score(const SkFontStyle& pattern, const SkFontStyle& candidate) { |
| int score = 0; |
| score += SkTAbs((pattern.width() - candidate.width()) * 100); |
| score += SkTAbs((pattern.isItalic() == candidate.isItalic()) ? 0 : 1000); |
| score += SkTAbs(pattern.weight() - candidate.weight()); |
| return score; |
| } |
| |
| SkTArray<SkAutoTUnref<SkTypeface_AndroidSystem>, true> fStyles; |
| |
| friend struct NameToFamily; |
| friend class SkFontMgr_Android; |
| |
| typedef SkFontStyleSet INHERITED; |
| }; |
| |
| /** On Android a single family can have many names, but our API assumes unique names. |
| * Map names to the back end so that all names for a given family refer to the same |
| * (non-replicated) set of typefaces. |
| * SkTDict<> doesn't let us do index-based lookup, so we write our own mapping. |
| */ |
| struct NameToFamily { |
| SkString name; |
| SkFontStyleSet_Android* styleSet; |
| }; |
| |
| class SkFontMgr_Android : public SkFontMgr { |
| public: |
| SkFontMgr_Android(const SkFontMgr_Android_CustomFonts* custom) { |
| SkTDArray<FontFamily*> families; |
| if (custom && SkFontMgr_Android_CustomFonts::kPreferSystem != custom->fSystemFontUse) { |
| SkString base(custom->fBasePath); |
| SkFontMgr_Android_Parser::GetCustomFontFamilies( |
| families, base, custom->fFontsXml, custom->fFallbackFontsXml); |
| } |
| if (!custom || |
| (custom && SkFontMgr_Android_CustomFonts::kOnlyCustom != custom->fSystemFontUse)) |
| { |
| SkFontMgr_Android_Parser::GetSystemFontFamilies(families); |
| } |
| if (custom && SkFontMgr_Android_CustomFonts::kPreferSystem == custom->fSystemFontUse) { |
| SkString base(custom->fBasePath); |
| SkFontMgr_Android_Parser::GetCustomFontFamilies( |
| families, base, custom->fFontsXml, custom->fFallbackFontsXml); |
| } |
| this->buildNameToFamilyMap(families); |
| this->findDefaultFont(); |
| families.deleteAll(); |
| } |
| |
| protected: |
| /** Returns not how many families we have, but how many unique names |
| * exist among the families. |
| */ |
| int onCountFamilies() const override { |
| return fNameToFamilyMap.count(); |
| } |
| |
| void onGetFamilyName(int index, SkString* familyName) const override { |
| if (index < 0 || fNameToFamilyMap.count() <= index) { |
| familyName->reset(); |
| return; |
| } |
| familyName->set(fNameToFamilyMap[index].name); |
| } |
| |
| SkFontStyleSet* onCreateStyleSet(int index) const override { |
| if (index < 0 || fNameToFamilyMap.count() <= index) { |
| return NULL; |
| } |
| return SkRef(fNameToFamilyMap[index].styleSet); |
| } |
| |
| SkFontStyleSet* onMatchFamily(const char familyName[]) const override { |
| if (!familyName) { |
| return NULL; |
| } |
| SkAutoAsciiToLC tolc(familyName); |
| for (int i = 0; i < fNameToFamilyMap.count(); ++i) { |
| if (fNameToFamilyMap[i].name.equals(tolc.lc())) { |
| return SkRef(fNameToFamilyMap[i].styleSet); |
| } |
| } |
| // TODO: eventually we should not need to name fallback families. |
| for (int i = 0; i < fFallbackNameToFamilyMap.count(); ++i) { |
| if (fFallbackNameToFamilyMap[i].name.equals(tolc.lc())) { |
| return SkRef(fFallbackNameToFamilyMap[i].styleSet); |
| } |
| } |
| return NULL; |
| } |
| |
| virtual SkTypeface* onMatchFamilyStyle(const char familyName[], |
| const SkFontStyle& style) const override { |
| SkAutoTUnref<SkFontStyleSet> sset(this->matchFamily(familyName)); |
| return sset->matchStyle(style); |
| } |
| |
| virtual SkTypeface* onMatchFaceStyle(const SkTypeface* typeface, |
| const SkFontStyle& style) const override { |
| for (int i = 0; i < fFontStyleSets.count(); ++i) { |
| for (int j = 0; j < fFontStyleSets[i]->fStyles.count(); ++j) { |
| if (fFontStyleSets[i]->fStyles[j] == typeface) { |
| return fFontStyleSets[i]->matchStyle(style); |
| } |
| } |
| } |
| return NULL; |
| } |
| |
| static SkTypeface_AndroidSystem* find_family_style_character( |
| const SkTDArray<NameToFamily>& fallbackNameToFamilyMap, |
| const SkFontStyle& style, bool elegant, |
| const SkString& langTag, SkUnichar character) |
| { |
| for (int i = 0; i < fallbackNameToFamilyMap.count(); ++i) { |
| SkFontStyleSet_Android* family = fallbackNameToFamilyMap[i].styleSet; |
| SkAutoTUnref<SkTypeface_AndroidSystem> face(family->matchStyle(style)); |
| |
| if (!langTag.isEmpty() && !face->fLang.getTag().startsWith(langTag.c_str())) { |
| continue; |
| } |
| |
| if (SkToBool(face->fVariantStyle & kElegant_FontVariant) != elegant) { |
| continue; |
| } |
| |
| SkPaint paint; |
| paint.setTypeface(face); |
| paint.setTextEncoding(SkPaint::kUTF32_TextEncoding); |
| |
| uint16_t glyphID; |
| paint.textToGlyphs(&character, sizeof(character), &glyphID); |
| if (glyphID != 0) { |
| return face.detach(); |
| } |
| } |
| return NULL; |
| } |
| |
| virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], |
| const SkFontStyle& style, |
| const char* bcp47[], |
| int bcp47Count, |
| SkUnichar character) const override |
| { |
| // The variant 'elegant' is 'not squashed', 'compact' is 'stays in ascent/descent'. |
| // The variant 'default' means 'compact and elegant'. |
| // As a result, it is not possible to know the variant context from the font alone. |
| // TODO: add 'is_elegant' and 'is_compact' bits to 'style' request. |
| |
| // The first time match anything elegant, second time anything not elegant. |
| for (int elegant = 2; elegant --> 0;) { |
| for (int bcp47Index = bcp47Count; bcp47Index --> 0;) { |
| SkLanguage lang(bcp47[bcp47Index]); |
| while (!lang.getTag().isEmpty()) { |
| SkTypeface_AndroidSystem* matchingTypeface = |
| find_family_style_character(fFallbackNameToFamilyMap, |
| style, SkToBool(elegant), |
| lang.getTag(), character); |
| if (matchingTypeface) { |
| return matchingTypeface; |
| } |
| |
| lang = lang.getParent(); |
| } |
| } |
| SkTypeface_AndroidSystem* matchingTypeface = |
| find_family_style_character(fFallbackNameToFamilyMap, |
| style, SkToBool(elegant), |
| SkString(), character); |
| if (matchingTypeface) { |
| return matchingTypeface; |
| } |
| } |
| return NULL; |
| } |
| |
| SkTypeface* onCreateFromData(SkData* data, int ttcIndex) const override { |
| return this->createFromStream(new SkMemoryStream(data), ttcIndex); |
| } |
| |
| SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const override { |
| SkAutoTDelete<SkStreamAsset> stream(SkStream::NewFromFile(path)); |
| return stream.get() ? this->createFromStream(stream.detach(), ttcIndex) : NULL; |
| } |
| |
| SkTypeface* onCreateFromStream(SkStreamAsset* bareStream, int ttcIndex) const override { |
| SkAutoTDelete<SkStreamAsset> stream(bareStream); |
| bool isFixedPitch; |
| SkFontStyle style; |
| SkString name; |
| if (!fScanner.scanFont(stream, ttcIndex, &name, &style, &isFixedPitch, NULL)) { |
| return NULL; |
| } |
| SkFontData* data(new SkFontData(stream.detach(), ttcIndex, NULL, 0)); |
| return SkNEW_ARGS(SkTypeface_AndroidStream, (data, style, isFixedPitch, name)); |
| } |
| |
| SkTypeface* onCreateFromFontData(SkFontData* data) const override { |
| SkStreamAsset* stream(data->getStream()); |
| bool isFixedPitch; |
| SkFontStyle style; |
| SkString name; |
| if (!fScanner.scanFont(stream, data->getIndex(), &name, &style, &isFixedPitch, NULL)) { |
| return NULL; |
| } |
| return SkNEW_ARGS(SkTypeface_AndroidStream, (data, style, isFixedPitch, name)); |
| } |
| |
| |
| virtual SkTypeface* onLegacyCreateTypeface(const char familyName[], |
| unsigned styleBits) const override { |
| SkFontStyle style = SkFontStyle(styleBits); |
| |
| if (familyName) { |
| // On Android, we must return NULL when we can't find the requested |
| // named typeface so that the system/app can provide their own recovery |
| // mechanism. On other platforms we'd provide a typeface from the |
| // default family instead. |
| return this->onMatchFamilyStyle(familyName, style); |
| } |
| return fDefaultFamily->matchStyle(style); |
| } |
| |
| |
| private: |
| |
| SkTypeface_FreeType::Scanner fScanner; |
| |
| SkTArray<SkAutoTUnref<SkFontStyleSet_Android>, true> fFontStyleSets; |
| SkFontStyleSet* fDefaultFamily; |
| SkTypeface* fDefaultTypeface; |
| |
| SkTDArray<NameToFamily> fNameToFamilyMap; |
| SkTDArray<NameToFamily> fFallbackNameToFamilyMap; |
| |
| void buildNameToFamilyMap(SkTDArray<FontFamily*> families) { |
| for (int i = 0; i < families.count(); i++) { |
| FontFamily& family = *families[i]; |
| |
| SkTDArray<NameToFamily>* nameToFamily = &fNameToFamilyMap; |
| if (family.fIsFallbackFont) { |
| nameToFamily = &fFallbackNameToFamilyMap; |
| |
| if (0 == family.fNames.count()) { |
| SkString& fallbackName = family.fNames.push_back(); |
| fallbackName.printf("%.2x##fallback", i); |
| } |
| } |
| |
| SkFontStyleSet_Android* newSet = |
| SkNEW_ARGS(SkFontStyleSet_Android, (family, fScanner)); |
| if (0 == newSet->count()) { |
| SkDELETE(newSet); |
| continue; |
| } |
| fFontStyleSets.push_back().reset(newSet); |
| |
| for (int j = 0; j < family.fNames.count(); j++) { |
| NameToFamily* nextEntry = nameToFamily->append(); |
| SkNEW_PLACEMENT_ARGS(&nextEntry->name, SkString, (family.fNames[j])); |
| nextEntry->styleSet = newSet; |
| } |
| } |
| } |
| |
| void findDefaultFont() { |
| SkASSERT(!fFontStyleSets.empty()); |
| |
| static const char* gDefaultNames[] = { "sans-serif" }; |
| for (size_t i = 0; i < SK_ARRAY_COUNT(gDefaultNames); ++i) { |
| SkFontStyleSet* set = this->onMatchFamily(gDefaultNames[i]); |
| if (NULL == set) { |
| continue; |
| } |
| SkTypeface* tf = set->matchStyle(SkFontStyle()); |
| if (NULL == tf) { |
| continue; |
| } |
| fDefaultFamily = set; |
| fDefaultTypeface = tf; |
| break; |
| } |
| if (NULL == fDefaultTypeface) { |
| fDefaultFamily = fFontStyleSets[0]; |
| fDefaultTypeface = fDefaultFamily->createTypeface(0); |
| } |
| SkASSERT(fDefaultFamily); |
| SkASSERT(fDefaultTypeface); |
| } |
| |
| typedef SkFontMgr INHERITED; |
| }; |
| |
| #ifdef SK_DEBUG |
| static char const * const gSystemFontUseStrings[] = { |
| "OnlyCustom", "PreferCustom", "PreferSystem" |
| }; |
| #endif |
| SkFontMgr* SkFontMgr_New_Android(const SkFontMgr_Android_CustomFonts* custom) { |
| if (custom) { |
| SkASSERT(0 <= custom->fSystemFontUse); |
| SkASSERT(custom->fSystemFontUse < SK_ARRAY_COUNT(gSystemFontUseStrings)); |
| SkDEBUGF(("SystemFontUse: %s BasePath: %s Fonts: %s FallbackFonts: %s\n", |
| gSystemFontUseStrings[custom->fSystemFontUse], |
| custom->fBasePath, |
| custom->fFontsXml, |
| custom->fFallbackFontsXml)); |
| } |
| |
| return SkNEW_ARGS(SkFontMgr_Android, (custom)); |
| } |