native/android/system_fonts.cpp - android_frameworks_base - Gitiles

 /*
  * Copyright (C) 2018 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include <jni.h>

 #define LOG_TAG "SystemFont"

 #include <android/font.h>
 #include <android/font_matcher.h>
 #include <android/system_fonts.h>

 #include <memory>
 #include <string>
 #include <vector>

 #include <errno.h>
 #include <fcntl.h>
 #include <libxml/tree.h>
 #include <log/log.h>
 #include <sys/stat.h>
 #include <unistd.h>

 #include <hwui/MinikinSkia.h>
 #include <minikin/FontCollection.h>
 #include <minikin/LocaleList.h>
 #include <minikin/SystemFonts.h>

 struct XmlCharDeleter {
     void operator()(xmlChar* b) { xmlFree(b); }
 };

 struct XmlDocDeleter {
     void operator()(xmlDoc* d) { xmlFreeDoc(d); }
 };

 using XmlCharUniquePtr = std::unique_ptr<xmlChar, XmlCharDeleter>;
 using XmlDocUniquePtr = std::unique_ptr<xmlDoc, XmlDocDeleter>;

 struct ParserState {
     xmlNode* mFontNode = nullptr;
     XmlCharUniquePtr mLocale;
 };

 struct AFont {
     std::string mFilePath;
     std::optional<std::string> mLocale;
     uint16_t mWeight;
     bool mItalic;
     uint32_t mCollectionIndex;
     std::vector<std::pair<uint32_t, float>> mAxes;

     bool operator==(const AFont& o) const {
         return mFilePath == o.mFilePath && mLocale == o.mLocale && mWeight == o.mWeight &&
                 mItalic == o.mItalic && mCollectionIndex == o.mCollectionIndex && mAxes == o.mAxes;
     }
 };

 struct FontHasher {
     std::size_t operator()(const AFont& font) const {
         std::size_t r = std::hash<std::string>{}(font.mFilePath);
         if (font.mLocale) {
             r = combine(r, std::hash<std::string>{}(*font.mLocale));
         }
         r = combine(r, std::hash<uint16_t>{}(font.mWeight));
         r = combine(r, std::hash<uint32_t>{}(font.mCollectionIndex));
         for (const auto& [tag, value] : font.mAxes) {
             r = combine(r, std::hash<uint32_t>{}(tag));
             r = combine(r, std::hash<float>{}(value));
         }
         return r;
     }

     std::size_t combine(std::size_t l, std::size_t r) const { return l ^ (r << 1); }
 };

 struct ASystemFontIterator {
     std::vector<AFont> fonts;
     uint32_t index;

     XmlDocUniquePtr mXmlDoc;

     ParserState state;

     // The OEM customization XML.
     XmlDocUniquePtr mCustomizationXmlDoc;
 };

 struct AFontMatcher {
     minikin::FontStyle mFontStyle;
     uint32_t mLocaleListId = 0;  // 0 is reserved for empty locale ID.
     bool mFamilyVariant = AFAMILY_VARIANT_DEFAULT;
 };

 static_assert(static_cast<uint32_t>(AFAMILY_VARIANT_DEFAULT) ==
               static_cast<uint32_t>(minikin::FamilyVariant::DEFAULT));
 static_assert(static_cast<uint32_t>(AFAMILY_VARIANT_COMPACT) ==
               static_cast<uint32_t>(minikin::FamilyVariant::COMPACT));
 static_assert(static_cast<uint32_t>(AFAMILY_VARIANT_ELEGANT) ==
               static_cast<uint32_t>(minikin::FamilyVariant::ELEGANT));

 namespace {

 std::string xmlTrim(const std::string& in) {
     if (in.empty()) {
         return in;
     }
     const char XML_SPACES[] = "\u0020\u000D\u000A\u0009";
     const size_t start = in.find_first_not_of(XML_SPACES);  // inclusive
     if (start == std::string::npos) {
         return "";
     }
     const size_t end = in.find_last_not_of(XML_SPACES);     // inclusive
     if (end == std::string::npos) {
         return "";
     }
     return in.substr(start, end - start + 1 /* +1 since end is inclusive */);
 }

 const xmlChar* FAMILY_TAG = BAD_CAST("family");
 const xmlChar* FONT_TAG = BAD_CAST("font");
 const xmlChar* LOCALE_ATTR_NAME = BAD_CAST("lang");

 xmlNode* firstElement(xmlNode* node, const xmlChar* tag) {
     for (xmlNode* child = node->children; child; child = child->next) {
         if (xmlStrEqual(child->name, tag)) {
             return child;
         }
     }
     return nullptr;
 }

 xmlNode* nextSibling(xmlNode* node, const xmlChar* tag) {
     while ((node = node->next) != nullptr) {
         if (xmlStrEqual(node->name, tag)) {
             return node;
         }
     }
     return nullptr;
 }

 void copyFont(const XmlDocUniquePtr& xmlDoc, const ParserState& state, AFont* out,
               const std::string& pathPrefix) {
     xmlNode* fontNode = state.mFontNode;
     XmlCharUniquePtr filePathStr(
             xmlNodeListGetString(xmlDoc.get(), fontNode->xmlChildrenNode, 1));
     out->mFilePath = pathPrefix + xmlTrim(
             std::string(filePathStr.get(), filePathStr.get() + xmlStrlen(filePathStr.get())));

     const xmlChar* WEIGHT_ATTR_NAME = BAD_CAST("weight");
     XmlCharUniquePtr weightStr(xmlGetProp(fontNode, WEIGHT_ATTR_NAME));
     out->mWeight = weightStr ?
             strtol(reinterpret_cast<const char*>(weightStr.get()), nullptr, 10) : 400;

     const xmlChar* STYLE_ATTR_NAME = BAD_CAST("style");
     const xmlChar* ITALIC_ATTR_VALUE = BAD_CAST("italic");
     XmlCharUniquePtr styleStr(xmlGetProp(fontNode, STYLE_ATTR_NAME));
     out->mItalic = styleStr ? xmlStrEqual(styleStr.get(), ITALIC_ATTR_VALUE) : false;

     const xmlChar* INDEX_ATTR_NAME = BAD_CAST("index");
     XmlCharUniquePtr indexStr(xmlGetProp(fontNode, INDEX_ATTR_NAME));
     out->mCollectionIndex =  indexStr ?
             strtol(reinterpret_cast<const char*>(indexStr.get()), nullptr, 10) : 0;

     if (state.mLocale) {
         out->mLocale.emplace(reinterpret_cast<const char*>(state.mLocale.get()));
     }

     const xmlChar* TAG_ATTR_NAME = BAD_CAST("tag");
     const xmlChar* STYLEVALUE_ATTR_NAME = BAD_CAST("stylevalue");
     const xmlChar* AXIS_TAG = BAD_CAST("axis");
     out->mAxes.clear();
     for (xmlNode* axis = firstElement(fontNode, AXIS_TAG); axis;
             axis = nextSibling(axis, AXIS_TAG)) {
         XmlCharUniquePtr tagStr(xmlGetProp(axis, TAG_ATTR_NAME));
         if (!tagStr || xmlStrlen(tagStr.get()) != 4) {
             continue;  // Tag value must be 4 char string
         }

         XmlCharUniquePtr styleValueStr(xmlGetProp(axis, STYLEVALUE_ATTR_NAME));
         if (!styleValueStr) {
             continue;
         }

         uint32_t tag =
             static_cast<uint32_t>(tagStr.get()[0] << 24) |
             static_cast<uint32_t>(tagStr.get()[1] << 16) |
             static_cast<uint32_t>(tagStr.get()[2] << 8) |
             static_cast<uint32_t>(tagStr.get()[3]);
         float styleValue = strtod(reinterpret_cast<const char*>(styleValueStr.get()), nullptr);
         out->mAxes.push_back(std::make_pair(tag, styleValue));
     }
 }

 bool isFontFileAvailable(const std::string& filePath) {
     std::string fullPath = filePath;
     struct stat st = {};
     if (stat(fullPath.c_str(), &st) != 0) {
         return false;
     }
     return S_ISREG(st.st_mode);
 }

 bool findFirstFontNode(const XmlDocUniquePtr& doc, ParserState* state) {
     xmlNode* familySet = xmlDocGetRootElement(doc.get());
     if (familySet == nullptr) {
         return false;
     }
     xmlNode* family = firstElement(familySet, FAMILY_TAG);
     if (family == nullptr) {
         return false;
     }
     state->mLocale.reset(xmlGetProp(family, LOCALE_ATTR_NAME));

     xmlNode* font = firstElement(family, FONT_TAG);
     while (font == nullptr) {
         family = nextSibling(family, FAMILY_TAG);
         if (family == nullptr) {
             return false;
         }
         font = firstElement(family, FONT_TAG);
     }
     state->mFontNode = font;
     return font != nullptr;
 }

 }  // namespace

 ASystemFontIterator* ASystemFontIterator_open() {
     std::unique_ptr<ASystemFontIterator> ite(new ASystemFontIterator());

     std::unordered_set<AFont, FontHasher> fonts;
     minikin::SystemFonts::getFontSet(
             [&fonts](const std::vector<std::shared_ptr<minikin::Font>>& fontSet) {
                 for (const auto& font : fontSet) {
                     std::optional<std::string> locale;
                     uint32_t localeId = font->getLocaleListId();
                     if (localeId != minikin::kEmptyLocaleListId) {
                         locale.emplace(minikin::getLocaleString(localeId));
                     }
                     std::vector<std::pair<uint32_t, float>> axes;
                     for (const auto& [tag, value] : font->typeface()->GetAxes()) {
                         axes.push_back(std::make_pair(tag, value));
                     }

                     fonts.insert({font->typeface()->GetFontPath(), std::move(locale),
                                   font->style().weight(),
                                   font->style().slant() == minikin::FontStyle::Slant::ITALIC,
                                   static_cast<uint32_t>(font->typeface()->GetFontIndex()), axes});
                 }
             });

     if (fonts.empty()) {
         ite->mXmlDoc.reset(xmlReadFile("/system/etc/fonts.xml", nullptr, 0));
         ite->mCustomizationXmlDoc.reset(
                 xmlReadFile("/product/etc/fonts_customization.xml", nullptr, 0));
     } else {
         ite->index = 0;
         ite->fonts.assign(fonts.begin(), fonts.end());
     }
     return ite.release();
 }

 void ASystemFontIterator_close(ASystemFontIterator* ite) {
     delete ite;
 }

 AFontMatcher* _Nonnull AFontMatcher_create() {
     return new AFontMatcher();
 }

 void AFontMatcher_destroy(AFontMatcher* matcher) {
     delete matcher;
 }

 void AFontMatcher_setStyle(
         AFontMatcher* _Nonnull matcher,
         uint16_t weight,
         bool italic) {
     matcher->mFontStyle = minikin::FontStyle(
             weight, static_cast<minikin::FontStyle::Slant>(italic));
 }

 void AFontMatcher_setLocales(
         AFontMatcher* _Nonnull matcher,
         const char* _Nonnull languageTags) {
     matcher->mLocaleListId = minikin::registerLocaleList(languageTags);
 }

 void AFontMatcher_setFamilyVariant(AFontMatcher* _Nonnull matcher, uint32_t familyVariant) {
     matcher->mFamilyVariant = familyVariant;
 }

 AFont* _Nonnull AFontMatcher_match(
         const AFontMatcher* _Nonnull matcher,
         const char* _Nonnull familyName,
         const uint16_t* _Nonnull text,
         const uint32_t textLength,
         uint32_t* _Nullable runLength) {
     std::shared_ptr<minikin::FontCollection> fc =
             minikin::SystemFonts::findFontCollection(familyName);
     std::vector<minikin::FontCollection::Run> runs = fc->itemize(
                 minikin::U16StringPiece(text, textLength),
                 matcher->mFontStyle,
                 matcher->mLocaleListId,
                 static_cast<minikin::FamilyVariant>(matcher->mFamilyVariant),
                 1  /* maxRun */);

     const std::shared_ptr<minikin::Font>& font =
             fc->getBestFont(minikin::U16StringPiece(text, textLength), runs[0], matcher->mFontStyle)
                     .font;
     std::unique_ptr<AFont> result = std::make_unique<AFont>();
     const android::MinikinFontSkia* minikinFontSkia =
             reinterpret_cast<android::MinikinFontSkia*>(font->typeface().get());
     result->mFilePath = minikinFontSkia->getFilePath();
     result->mWeight = font->style().weight();
     result->mItalic = font->style().slant() == minikin::FontStyle::Slant::ITALIC;
     result->mCollectionIndex = minikinFontSkia->GetFontIndex();
     const std::vector<minikin::FontVariation>& axes = minikinFontSkia->GetAxes();
     result->mAxes.reserve(axes.size());
     for (auto axis : axes) {
         result->mAxes.push_back(std::make_pair(axis.axisTag, axis.value));
     }
     if (runLength != nullptr) {
         *runLength = runs[0].end;
     }
     return result.release();
 }

 bool findNextFontNode(const XmlDocUniquePtr& xmlDoc, ParserState* state) {
     if (state->mFontNode == nullptr) {
         if (!xmlDoc) {
             return false;  // Already at the end.
         } else {
             // First time to query font.
             return findFirstFontNode(xmlDoc, state);
         }
     } else {
         xmlNode* nextNode = nextSibling(state->mFontNode, FONT_TAG);
         while (nextNode == nullptr) {
             xmlNode* family = nextSibling(state->mFontNode->parent, FAMILY_TAG);
             if (family == nullptr) {
                 break;
             }
             state->mLocale.reset(xmlGetProp(family, LOCALE_ATTR_NAME));
             nextNode = firstElement(family, FONT_TAG);
         }
         state->mFontNode = nextNode;
         return nextNode != nullptr;
     }
 }

 AFont* ASystemFontIterator_next(ASystemFontIterator* ite) {
     LOG_ALWAYS_FATAL_IF(ite == nullptr, "nullptr has passed as iterator argument");
     if (!ite->fonts.empty()) {
         if (ite->index >= ite->fonts.size()) {
             return nullptr;
         }
         return new AFont(ite->fonts[ite->index++]);
     }

     if (ite->mXmlDoc) {
         if (!findNextFontNode(ite->mXmlDoc, &ite->state)) {
             // Reached end of the XML file. Continue OEM customization.
             ite->mXmlDoc.reset();
         } else {
             std::unique_ptr<AFont> font = std::make_unique<AFont>();
             copyFont(ite->mXmlDoc, ite->state, font.get(), "/system/fonts/");
             if (!isFontFileAvailable(font->mFilePath)) {
                 return ASystemFontIterator_next(ite);
             }
             return font.release();
         }
     }
     if (ite->mCustomizationXmlDoc) {
         // TODO: Filter only customizationType="new-named-family"
         if (!findNextFontNode(ite->mCustomizationXmlDoc, &ite->state)) {
             // Reached end of the XML file. Finishing
             ite->mCustomizationXmlDoc.reset();
             return nullptr;
         } else {
             std::unique_ptr<AFont> font = std::make_unique<AFont>();
             copyFont(ite->mCustomizationXmlDoc, ite->state, font.get(), "/product/fonts/");
             if (!isFontFileAvailable(font->mFilePath)) {
                 return ASystemFontIterator_next(ite);
             }
             return font.release();
         }
     }
     return nullptr;
 }

 void AFont_close(AFont* font) {
     delete font;
 }

 const char* AFont_getFontFilePath(const AFont* font) {
     LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed as font argument");
     return font->mFilePath.c_str();
 }

 uint16_t AFont_getWeight(const AFont* font) {
     LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed as font argument");
     return font->mWeight;
 }

 bool AFont_isItalic(const AFont* font) {
     LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed as font argument");
     return font->mItalic;
 }

 const char* AFont_getLocale(const AFont* font) {
     LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed to font argument");
     return font->mLocale ? font->mLocale->c_str() : nullptr;
 }

 size_t AFont_getCollectionIndex(const AFont* font) {
     LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed to font argument");
     return font->mCollectionIndex;
 }

 size_t AFont_getAxisCount(const AFont* font) {
     LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed to font argument");
     return font->mAxes.size();
 }

 uint32_t AFont_getAxisTag(const AFont* font, uint32_t axisIndex) {
     LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed to font argument");
     LOG_ALWAYS_FATAL_IF(axisIndex >= font->mAxes.size(),
                         "given axis index is out of bounds. (< %zd", font->mAxes.size());
     return font->mAxes[axisIndex].first;
 }

 float AFont_getAxisValue(const AFont* font, uint32_t axisIndex) {
     LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed to font argument");
     LOG_ALWAYS_FATAL_IF(axisIndex >= font->mAxes.size(),
                         "given axis index is out of bounds. (< %zd", font->mAxes.size());
     return font->mAxes[axisIndex].second;
 }
	/*
	* Copyright (C) 2018 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include <jni.h>

	#define LOG_TAG "SystemFont"

	#include <android/font.h>
	#include <android/font_matcher.h>
	#include <android/system_fonts.h>

	#include <memory>
	#include <string>
	#include <vector>

	#include <errno.h>
	#include <fcntl.h>
	#include <libxml/tree.h>
	#include <log/log.h>
	#include <sys/stat.h>
	#include <unistd.h>

	#include <hwui/MinikinSkia.h>
	#include <minikin/FontCollection.h>
	#include <minikin/LocaleList.h>
	#include <minikin/SystemFonts.h>

	struct XmlCharDeleter {
	void operator()(xmlChar* b) { xmlFree(b); }
	};

	struct XmlDocDeleter {
	void operator()(xmlDoc* d) { xmlFreeDoc(d); }
	};

	using XmlCharUniquePtr = std::unique_ptr<xmlChar, XmlCharDeleter>;
	using XmlDocUniquePtr = std::unique_ptr<xmlDoc, XmlDocDeleter>;

	struct ParserState {
	xmlNode* mFontNode = nullptr;
	XmlCharUniquePtr mLocale;
	};

	struct AFont {
	std::string mFilePath;
	std::optional<std::string> mLocale;
	uint16_t mWeight;
	bool mItalic;
	uint32_t mCollectionIndex;
	std::vector<std::pair<uint32_t, float>> mAxes;

	bool operator==(const AFont& o) const {
	return mFilePath == o.mFilePath && mLocale == o.mLocale && mWeight == o.mWeight &&
	mItalic == o.mItalic && mCollectionIndex == o.mCollectionIndex && mAxes == o.mAxes;
	}
	};

	struct FontHasher {
	std::size_t operator()(const AFont& font) const {
	std::size_t r = std::hash<std::string>{}(font.mFilePath);
	if (font.mLocale) {
	r = combine(r, std::hash<std::string>{}(*font.mLocale));
	}
	r = combine(r, std::hash<uint16_t>{}(font.mWeight));
	r = combine(r, std::hash<uint32_t>{}(font.mCollectionIndex));
	for (const auto& [tag, value] : font.mAxes) {
	r = combine(r, std::hash<uint32_t>{}(tag));
	r = combine(r, std::hash<float>{}(value));
	}
	return r;
	}

	std::size_t combine(std::size_t l, std::size_t r) const { return l ^ (r << 1); }
	};

	struct ASystemFontIterator {
	std::vector<AFont> fonts;
	uint32_t index;

	XmlDocUniquePtr mXmlDoc;

	ParserState state;

	// The OEM customization XML.
	XmlDocUniquePtr mCustomizationXmlDoc;
	};

	struct AFontMatcher {
	minikin::FontStyle mFontStyle;
	uint32_t mLocaleListId = 0; // 0 is reserved for empty locale ID.
	bool mFamilyVariant = AFAMILY_VARIANT_DEFAULT;
	};

	static_assert(static_cast<uint32_t>(AFAMILY_VARIANT_DEFAULT) ==
	static_cast<uint32_t>(minikin::FamilyVariant::DEFAULT));
	static_assert(static_cast<uint32_t>(AFAMILY_VARIANT_COMPACT) ==
	static_cast<uint32_t>(minikin::FamilyVariant::COMPACT));
	static_assert(static_cast<uint32_t>(AFAMILY_VARIANT_ELEGANT) ==
	static_cast<uint32_t>(minikin::FamilyVariant::ELEGANT));

	namespace {

	std::string xmlTrim(const std::string& in) {
	if (in.empty()) {
	return in;
	}
	const char XML_SPACES[] = "\u0020\u000D\u000A\u0009";
	const size_t start = in.find_first_not_of(XML_SPACES); // inclusive
	if (start == std::string::npos) {
	return "";
	}
	const size_t end = in.find_last_not_of(XML_SPACES); // inclusive
	if (end == std::string::npos) {
	return "";
	}
	return in.substr(start, end - start + 1 /* +1 since end is inclusive */);
	}

	const xmlChar* FAMILY_TAG = BAD_CAST("family");
	const xmlChar* FONT_TAG = BAD_CAST("font");
	const xmlChar* LOCALE_ATTR_NAME = BAD_CAST("lang");

	xmlNode* firstElement(xmlNode* node, const xmlChar* tag) {
	for (xmlNode* child = node->children; child; child = child->next) {
	if (xmlStrEqual(child->name, tag)) {
	return child;
	}
	}
	return nullptr;
	}

	xmlNode* nextSibling(xmlNode* node, const xmlChar* tag) {
	while ((node = node->next) != nullptr) {
	if (xmlStrEqual(node->name, tag)) {
	return node;
	}
	}
	return nullptr;
	}

	void copyFont(const XmlDocUniquePtr& xmlDoc, const ParserState& state, AFont* out,
	const std::string& pathPrefix) {
	xmlNode* fontNode = state.mFontNode;
	XmlCharUniquePtr filePathStr(
	xmlNodeListGetString(xmlDoc.get(), fontNode->xmlChildrenNode, 1));
	out->mFilePath = pathPrefix + xmlTrim(
	std::string(filePathStr.get(), filePathStr.get() + xmlStrlen(filePathStr.get())));

	const xmlChar* WEIGHT_ATTR_NAME = BAD_CAST("weight");
	XmlCharUniquePtr weightStr(xmlGetProp(fontNode, WEIGHT_ATTR_NAME));
	out->mWeight = weightStr ?
	strtol(reinterpret_cast<const char*>(weightStr.get()), nullptr, 10) : 400;

	const xmlChar* STYLE_ATTR_NAME = BAD_CAST("style");
	const xmlChar* ITALIC_ATTR_VALUE = BAD_CAST("italic");
	XmlCharUniquePtr styleStr(xmlGetProp(fontNode, STYLE_ATTR_NAME));
	out->mItalic = styleStr ? xmlStrEqual(styleStr.get(), ITALIC_ATTR_VALUE) : false;

	const xmlChar* INDEX_ATTR_NAME = BAD_CAST("index");
	XmlCharUniquePtr indexStr(xmlGetProp(fontNode, INDEX_ATTR_NAME));
	out->mCollectionIndex = indexStr ?
	strtol(reinterpret_cast<const char*>(indexStr.get()), nullptr, 10) : 0;

	if (state.mLocale) {
	out->mLocale.emplace(reinterpret_cast<const char*>(state.mLocale.get()));
	}

	const xmlChar* TAG_ATTR_NAME = BAD_CAST("tag");
	const xmlChar* STYLEVALUE_ATTR_NAME = BAD_CAST("stylevalue");
	const xmlChar* AXIS_TAG = BAD_CAST("axis");
	out->mAxes.clear();
	for (xmlNode* axis = firstElement(fontNode, AXIS_TAG); axis;
	axis = nextSibling(axis, AXIS_TAG)) {
	XmlCharUniquePtr tagStr(xmlGetProp(axis, TAG_ATTR_NAME));
	if (!tagStr \|\| xmlStrlen(tagStr.get()) != 4) {
	continue; // Tag value must be 4 char string
	}

	XmlCharUniquePtr styleValueStr(xmlGetProp(axis, STYLEVALUE_ATTR_NAME));
	if (!styleValueStr) {
	continue;
	}

	uint32_t tag =
	static_cast<uint32_t>(tagStr.get()[0] << 24) \|
	static_cast<uint32_t>(tagStr.get()[1] << 16) \|
	static_cast<uint32_t>(tagStr.get()[2] << 8) \|
	static_cast<uint32_t>(tagStr.get()[3]);
	float styleValue = strtod(reinterpret_cast<const char*>(styleValueStr.get()), nullptr);
	out->mAxes.push_back(std::make_pair(tag, styleValue));
	}
	}

	bool isFontFileAvailable(const std::string& filePath) {
	std::string fullPath = filePath;
	struct stat st = {};
	if (stat(fullPath.c_str(), &st) != 0) {
	return false;
	}
	return S_ISREG(st.st_mode);
	}

	bool findFirstFontNode(const XmlDocUniquePtr& doc, ParserState* state) {
	xmlNode* familySet = xmlDocGetRootElement(doc.get());
	if (familySet == nullptr) {
	return false;
	}
	xmlNode* family = firstElement(familySet, FAMILY_TAG);
	if (family == nullptr) {
	return false;
	}
	state->mLocale.reset(xmlGetProp(family, LOCALE_ATTR_NAME));

	xmlNode* font = firstElement(family, FONT_TAG);
	while (font == nullptr) {
	family = nextSibling(family, FAMILY_TAG);
	if (family == nullptr) {
	return false;
	}
	font = firstElement(family, FONT_TAG);
	}
	state->mFontNode = font;
	return font != nullptr;
	}

	} // namespace

	ASystemFontIterator* ASystemFontIterator_open() {
	std::unique_ptr<ASystemFontIterator> ite(new ASystemFontIterator());

	std::unordered_set<AFont, FontHasher> fonts;
	minikin::SystemFonts::getFontSet(
	[&fonts](const std::vector<std::shared_ptr<minikin::Font>>& fontSet) {
	for (const auto& font : fontSet) {
	std::optional<std::string> locale;
	uint32_t localeId = font->getLocaleListId();
	if (localeId != minikin::kEmptyLocaleListId) {
	locale.emplace(minikin::getLocaleString(localeId));
	}
	std::vector<std::pair<uint32_t, float>> axes;
	for (const auto& [tag, value] : font->typeface()->GetAxes()) {
	axes.push_back(std::make_pair(tag, value));
	}

	fonts.insert({font->typeface()->GetFontPath(), std::move(locale),
	font->style().weight(),
	font->style().slant() == minikin::FontStyle::Slant::ITALIC,
	static_cast<uint32_t>(font->typeface()->GetFontIndex()), axes});
	}
	});

	if (fonts.empty()) {
	ite->mXmlDoc.reset(xmlReadFile("/system/etc/fonts.xml", nullptr, 0));
	ite->mCustomizationXmlDoc.reset(
	xmlReadFile("/product/etc/fonts_customization.xml", nullptr, 0));
	} else {
	ite->index = 0;
	ite->fonts.assign(fonts.begin(), fonts.end());
	}
	return ite.release();
	}

	void ASystemFontIterator_close(ASystemFontIterator* ite) {
	delete ite;
	}

	AFontMatcher* _Nonnull AFontMatcher_create() {
	return new AFontMatcher();
	}

	void AFontMatcher_destroy(AFontMatcher* matcher) {
	delete matcher;
	}

	void AFontMatcher_setStyle(
	AFontMatcher* _Nonnull matcher,
	uint16_t weight,
	bool italic) {
	matcher->mFontStyle = minikin::FontStyle(
	weight, static_cast<minikin::FontStyle::Slant>(italic));
	}

	void AFontMatcher_setLocales(
	AFontMatcher* _Nonnull matcher,
	const char* _Nonnull languageTags) {
	matcher->mLocaleListId = minikin::registerLocaleList(languageTags);
	}

	void AFontMatcher_setFamilyVariant(AFontMatcher* _Nonnull matcher, uint32_t familyVariant) {
	matcher->mFamilyVariant = familyVariant;
	}

	AFont* _Nonnull AFontMatcher_match(
	const AFontMatcher* _Nonnull matcher,
	const char* _Nonnull familyName,
	const uint16_t* _Nonnull text,
	const uint32_t textLength,
	uint32_t* _Nullable runLength) {
	std::shared_ptr<minikin::FontCollection> fc =
	minikin::SystemFonts::findFontCollection(familyName);
	std::vector<minikin::FontCollection::Run> runs = fc->itemize(
	minikin::U16StringPiece(text, textLength),
	matcher->mFontStyle,
	matcher->mLocaleListId,
	static_cast<minikin::FamilyVariant>(matcher->mFamilyVariant),
	1 /* maxRun */);

	const std::shared_ptr<minikin::Font>& font =
	fc->getBestFont(minikin::U16StringPiece(text, textLength), runs[0], matcher->mFontStyle)
	.font;
	std::unique_ptr<AFont> result = std::make_unique<AFont>();
	const android::MinikinFontSkia* minikinFontSkia =
	reinterpret_cast<android::MinikinFontSkia*>(font->typeface().get());
	result->mFilePath = minikinFontSkia->getFilePath();
	result->mWeight = font->style().weight();
	result->mItalic = font->style().slant() == minikin::FontStyle::Slant::ITALIC;
	result->mCollectionIndex = minikinFontSkia->GetFontIndex();
	const std::vector<minikin::FontVariation>& axes = minikinFontSkia->GetAxes();
	result->mAxes.reserve(axes.size());
	for (auto axis : axes) {
	result->mAxes.push_back(std::make_pair(axis.axisTag, axis.value));
	}
	if (runLength != nullptr) {
	*runLength = runs[0].end;
	}
	return result.release();
	}

	bool findNextFontNode(const XmlDocUniquePtr& xmlDoc, ParserState* state) {
	if (state->mFontNode == nullptr) {
	if (!xmlDoc) {
	return false; // Already at the end.
	} else {
	// First time to query font.
	return findFirstFontNode(xmlDoc, state);
	}
	} else {
	xmlNode* nextNode = nextSibling(state->mFontNode, FONT_TAG);
	while (nextNode == nullptr) {
	xmlNode* family = nextSibling(state->mFontNode->parent, FAMILY_TAG);
	if (family == nullptr) {
	break;
	}
	state->mLocale.reset(xmlGetProp(family, LOCALE_ATTR_NAME));
	nextNode = firstElement(family, FONT_TAG);
	}
	state->mFontNode = nextNode;
	return nextNode != nullptr;
	}
	}

	AFont* ASystemFontIterator_next(ASystemFontIterator* ite) {
	LOG_ALWAYS_FATAL_IF(ite == nullptr, "nullptr has passed as iterator argument");
	if (!ite->fonts.empty()) {
	if (ite->index >= ite->fonts.size()) {
	return nullptr;
	}
	return new AFont(ite->fonts[ite->index++]);
	}

	if (ite->mXmlDoc) {
	if (!findNextFontNode(ite->mXmlDoc, &ite->state)) {
	// Reached end of the XML file. Continue OEM customization.
	ite->mXmlDoc.reset();
	} else {
	std::unique_ptr<AFont> font = std::make_unique<AFont>();
	copyFont(ite->mXmlDoc, ite->state, font.get(), "/system/fonts/");
	if (!isFontFileAvailable(font->mFilePath)) {
	return ASystemFontIterator_next(ite);
	}
	return font.release();
	}
	}
	if (ite->mCustomizationXmlDoc) {
	// TODO: Filter only customizationType="new-named-family"
	if (!findNextFontNode(ite->mCustomizationXmlDoc, &ite->state)) {
	// Reached end of the XML file. Finishing
	ite->mCustomizationXmlDoc.reset();
	return nullptr;
	} else {
	std::unique_ptr<AFont> font = std::make_unique<AFont>();
	copyFont(ite->mCustomizationXmlDoc, ite->state, font.get(), "/product/fonts/");
	if (!isFontFileAvailable(font->mFilePath)) {
	return ASystemFontIterator_next(ite);
	}
	return font.release();
	}
	}
	return nullptr;
	}

	void AFont_close(AFont* font) {
	delete font;
	}

	const char* AFont_getFontFilePath(const AFont* font) {
	LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed as font argument");
	return font->mFilePath.c_str();
	}

	uint16_t AFont_getWeight(const AFont* font) {
	LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed as font argument");
	return font->mWeight;
	}

	bool AFont_isItalic(const AFont* font) {
	LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed as font argument");
	return font->mItalic;
	}

	const char* AFont_getLocale(const AFont* font) {
	LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed to font argument");
	return font->mLocale ? font->mLocale->c_str() : nullptr;
	}

	size_t AFont_getCollectionIndex(const AFont* font) {
	LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed to font argument");
	return font->mCollectionIndex;
	}

	size_t AFont_getAxisCount(const AFont* font) {
	LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed to font argument");
	return font->mAxes.size();
	}

	uint32_t AFont_getAxisTag(const AFont* font, uint32_t axisIndex) {
	LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed to font argument");
	LOG_ALWAYS_FATAL_IF(axisIndex >= font->mAxes.size(),
	"given axis index is out of bounds. (< %zd", font->mAxes.size());
	return font->mAxes[axisIndex].first;
	}

	float AFont_getAxisValue(const AFont* font, uint32_t axisIndex) {
	LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed to font argument");
	LOG_ALWAYS_FATAL_IF(axisIndex >= font->mAxes.size(),
	"given axis index is out of bounds. (< %zd", font->mAxes.size());
	return font->mAxes[axisIndex].second;
	}