native/android/system_fonts.cpp - LeafOS-Project/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>

 #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>

 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 ASystemFontIterator {
     XmlDocUniquePtr mXmlDoc;
     xmlNode* mFontNode;
 };

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

 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");

 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(ASystemFontIterator* ite, ASystemFont* out) {
     const xmlChar* LOCALE_ATTR_NAME = BAD_CAST("lang");
     XmlCharUniquePtr filePathStr(
             xmlNodeListGetString(ite->mXmlDoc.get(), ite->mFontNode->xmlChildrenNode, 1));
     out->mFilePath = "/system/fonts/" + xmlTrim(
             std::string(filePathStr.get(), filePathStr.get() + xmlStrlen(filePathStr.get())));

     const xmlChar* WEIGHT_ATTR_NAME = BAD_CAST("weight");
     XmlCharUniquePtr weightStr(xmlGetProp(ite->mFontNode, 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(ite->mFontNode, STYLE_ATTR_NAME));
     out->mItalic = styleStr ? xmlStrEqual(styleStr.get(), ITALIC_ATTR_VALUE) : false;

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

     XmlCharUniquePtr localeStr(xmlGetProp(ite->mXmlDoc->parent, LOCALE_ATTR_NAME));
     out->mLocale.reset(
             localeStr ? new std::string(reinterpret_cast<const char*>(localeStr.get())) : nullptr);

     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(ite->mFontNode, 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);
 }

 xmlNode* findFirstFontNode(xmlDoc* doc) {
     xmlNode* familySet = xmlDocGetRootElement(doc);
     if (familySet == nullptr) {
         return nullptr;
     }
     xmlNode* family = firstElement(familySet, FAMILY_TAG);
     if (family == nullptr) {
         return nullptr;
     }

     xmlNode* font = firstElement(family, FONT_TAG);
     while (font == nullptr) {
         family = nextSibling(family, FAMILY_TAG);
         if (family == nullptr) {
             return nullptr;
         }
         font = firstElement(family, FONT_TAG);
     }
     return font;
 }

 }  // namespace

 ASystemFontIterator* ASystemFontIterator_open() {
     std::unique_ptr<ASystemFontIterator> ite(new ASystemFontIterator());
     ite->mXmlDoc.reset(xmlReadFile("/system/etc/fonts.xml", nullptr, 0));
     return ite.release();
 }

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

 ASystemFont* ASystemFontIterator_next(ASystemFontIterator* ite) {
     LOG_ALWAYS_FATAL_IF(ite == nullptr, "nullptr has passed as iterator argument");
     if (ite->mFontNode == nullptr) {
         if (ite->mXmlDoc == nullptr) {
             return nullptr;  // Already at the end.
         } else {
             // First time to query font.
             ite->mFontNode = findFirstFontNode(ite->mXmlDoc.get());
             if (ite->mFontNode == nullptr) {
                 ite->mXmlDoc.reset();
                 return nullptr;  // No font node found.
             }
             std::unique_ptr<ASystemFont> font = std::make_unique<ASystemFont>();
             copyFont(ite, font.get());
             return font.release();
         }
     } else {
         xmlNode* nextNode = nextSibling(ite->mFontNode, FONT_TAG);
         while (nextNode == nullptr) {
             xmlNode* family = nextSibling(ite->mFontNode->parent, FAMILY_TAG);
             if (family == nullptr) {
                 break;
             }
             nextNode = firstElement(family, FONT_TAG);
         }
         ite->mFontNode = nextNode;
         if (nextNode == nullptr) {
             ite->mXmlDoc.reset();
             return nullptr;
         }

         std::unique_ptr<ASystemFont> font = std::make_unique<ASystemFont>();
         copyFont(ite, font.get());
         if (!isFontFileAvailable(font->mFilePath)) {
             // fonts.xml intentionally contains missing font configuration. Skip it.
             return ASystemFontIterator_next(ite);
         }
         return font.release();
     }
 }

 void ASystemFont_close(ASystemFont* font) {
     delete font;
 }

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

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

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

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

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

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

 uint32_t ASystemFont_getAxisTag(const ASystemFont* 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 ASystemFont_getAxisValue(const ASystemFont* 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>

	#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>

	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 ASystemFontIterator {
	XmlDocUniquePtr mXmlDoc;
	xmlNode* mFontNode;
	};

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

	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");

	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(ASystemFontIterator* ite, ASystemFont* out) {
	const xmlChar* LOCALE_ATTR_NAME = BAD_CAST("lang");
	XmlCharUniquePtr filePathStr(
	xmlNodeListGetString(ite->mXmlDoc.get(), ite->mFontNode->xmlChildrenNode, 1));
	out->mFilePath = "/system/fonts/" + xmlTrim(
	std::string(filePathStr.get(), filePathStr.get() + xmlStrlen(filePathStr.get())));

	const xmlChar* WEIGHT_ATTR_NAME = BAD_CAST("weight");
	XmlCharUniquePtr weightStr(xmlGetProp(ite->mFontNode, 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(ite->mFontNode, STYLE_ATTR_NAME));
	out->mItalic = styleStr ? xmlStrEqual(styleStr.get(), ITALIC_ATTR_VALUE) : false;

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

	XmlCharUniquePtr localeStr(xmlGetProp(ite->mXmlDoc->parent, LOCALE_ATTR_NAME));
	out->mLocale.reset(
	localeStr ? new std::string(reinterpret_cast<const char*>(localeStr.get())) : nullptr);

	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(ite->mFontNode, 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);
	}

	xmlNode* findFirstFontNode(xmlDoc* doc) {
	xmlNode* familySet = xmlDocGetRootElement(doc);
	if (familySet == nullptr) {
	return nullptr;
	}
	xmlNode* family = firstElement(familySet, FAMILY_TAG);
	if (family == nullptr) {
	return nullptr;
	}

	xmlNode* font = firstElement(family, FONT_TAG);
	while (font == nullptr) {
	family = nextSibling(family, FAMILY_TAG);
	if (family == nullptr) {
	return nullptr;
	}
	font = firstElement(family, FONT_TAG);
	}
	return font;
	}

	} // namespace

	ASystemFontIterator* ASystemFontIterator_open() {
	std::unique_ptr<ASystemFontIterator> ite(new ASystemFontIterator());
	ite->mXmlDoc.reset(xmlReadFile("/system/etc/fonts.xml", nullptr, 0));
	return ite.release();
	}

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

	ASystemFont* ASystemFontIterator_next(ASystemFontIterator* ite) {
	LOG_ALWAYS_FATAL_IF(ite == nullptr, "nullptr has passed as iterator argument");
	if (ite->mFontNode == nullptr) {
	if (ite->mXmlDoc == nullptr) {
	return nullptr; // Already at the end.
	} else {
	// First time to query font.
	ite->mFontNode = findFirstFontNode(ite->mXmlDoc.get());
	if (ite->mFontNode == nullptr) {
	ite->mXmlDoc.reset();
	return nullptr; // No font node found.
	}
	std::unique_ptr<ASystemFont> font = std::make_unique<ASystemFont>();
	copyFont(ite, font.get());
	return font.release();
	}
	} else {
	xmlNode* nextNode = nextSibling(ite->mFontNode, FONT_TAG);
	while (nextNode == nullptr) {
	xmlNode* family = nextSibling(ite->mFontNode->parent, FAMILY_TAG);
	if (family == nullptr) {
	break;
	}
	nextNode = firstElement(family, FONT_TAG);
	}
	ite->mFontNode = nextNode;
	if (nextNode == nullptr) {
	ite->mXmlDoc.reset();
	return nullptr;
	}

	std::unique_ptr<ASystemFont> font = std::make_unique<ASystemFont>();
	copyFont(ite, font.get());
	if (!isFontFileAvailable(font->mFilePath)) {
	// fonts.xml intentionally contains missing font configuration. Skip it.
	return ASystemFontIterator_next(ite);
	}
	return font.release();
	}
	}

	void ASystemFont_close(ASystemFont* font) {
	delete font;
	}

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

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

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

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

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

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

	uint32_t ASystemFont_getAxisTag(const ASystemFont* 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 ASystemFont_getAxisValue(const ASystemFont* 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;
	}