core/java/android/os/GraphicsEnvironment.java - platform/frameworks/base - Gitiles

 /*
  * Copyright 2016 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.
  */

 package android.os;

 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
 import android.content.res.AssetFileDescriptor;
 import android.content.res.AssetManager;
 import android.opengl.EGL14;
 import android.provider.Settings;
 import android.util.Log;

 import dalvik.system.VMRuntime;

 import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileDescriptor;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;

 /** @hide */
 public class GraphicsEnvironment {

     private static final GraphicsEnvironment sInstance = new GraphicsEnvironment();

     /**
      * Returns the shared {@link GraphicsEnvironment} instance.
      */
     public static GraphicsEnvironment getInstance() {
         return sInstance;
     }

     private static final boolean DEBUG = false;
     private static final String TAG = "GraphicsEnvironment";
     private static final String PROPERTY_GFX_DRIVER = "ro.gfx.driver.0";
     private static final String GUP_WHITELIST_FILENAME = "whitelist.txt";
     private static final String ANGLE_RULES_FILE = "a4a_rules.json";
     private static final String ANGLE_TEMP_RULES = "debug.angle.rules";
     private static final String ACTION_ANGLE_FOR_ANDROID = "android.app.action.ANGLE_FOR_ANDROID";

     private ClassLoader mClassLoader;
     private String mLayerPath;
     private String mDebugLayerPath;

     /**
      * Set up GraphicsEnvironment
      */
     public void setup(Context context, Bundle coreSettings) {
         setupGpuLayers(context, coreSettings);
         setupAngle(context, coreSettings, context.getPackageName());
         chooseDriver(context, coreSettings);
     }

     /**
      * Check whether application is debuggable
      */
     private static boolean isDebuggable(Context context) {
         return (context.getApplicationInfo().flags & ApplicationInfo.FLAG_DEBUGGABLE) > 0;
     }

     /**
      * Store the layer paths available to the loader.
      */
     public void setLayerPaths(ClassLoader classLoader,
                               String layerPath,
                               String debugLayerPath) {
         // We have to store these in the class because they are set up before we
         // have access to the Context to properly set up GraphicsEnvironment
         mClassLoader = classLoader;
         mLayerPath = layerPath;
         mDebugLayerPath = debugLayerPath;
     }

     /**
      * Return the debug layer app's on-disk and in-APK lib directories
      */
     private static String getDebugLayerAppPaths(Context context, String app) {
         ApplicationInfo appInfo;
         try {
             appInfo = context.getPackageManager().getApplicationInfo(
                     app, PackageManager.MATCH_ALL);
         } catch (PackageManager.NameNotFoundException e) {
             Log.w(TAG, "Debug layer app '" + app + "' not installed");

             return null;
         }

         String abi = chooseAbi(appInfo);

         StringBuilder sb = new StringBuilder();
         sb.append(appInfo.nativeLibraryDir)
             .append(File.pathSeparator);
         sb.append(appInfo.sourceDir)
             .append("!/lib/")
             .append(abi);
         String paths = sb.toString();

         if (DEBUG) Log.v(TAG, "Debug layer app libs: " + paths);

         return paths;
     }

     /**
      * Set up layer search paths for all apps
      * If debuggable, check for additional debug settings
      */
     private void setupGpuLayers(Context context, Bundle coreSettings) {

         String layerPaths = "";

         // Only enable additional debug functionality if the following conditions are met:
         // 1. App is debuggable or device is rooted
         // 2. ENABLE_GPU_DEBUG_LAYERS is true
         // 3. Package name is equal to GPU_DEBUG_APP

         if (isDebuggable(context) || (getCanLoadSystemLibraries() == 1)) {

             int enable = coreSettings.getInt(Settings.Global.ENABLE_GPU_DEBUG_LAYERS, 0);

             if (enable != 0) {

                 String gpuDebugApp = coreSettings.getString(Settings.Global.GPU_DEBUG_APP);

                 String packageName = context.getPackageName();

                 if ((gpuDebugApp != null && packageName != null)
                         && (!gpuDebugApp.isEmpty() && !packageName.isEmpty())
                         && gpuDebugApp.equals(packageName)) {
                     Log.i(TAG, "GPU debug layers enabled for " + packageName);

                     // Prepend the debug layer path as a searchable path.
                     // This will ensure debug layers added will take precedence over
                     // the layers specified by the app.
                     layerPaths = mDebugLayerPath + ":";


                     // If there is a debug layer app specified, add its path.
                     String gpuDebugLayerApp =
                             coreSettings.getString(Settings.Global.GPU_DEBUG_LAYER_APP);

                     if (gpuDebugLayerApp != null && !gpuDebugLayerApp.isEmpty()) {
                         Log.i(TAG, "GPU debug layer app: " + gpuDebugLayerApp);
                         String paths = getDebugLayerAppPaths(context, gpuDebugLayerApp);
                         if (paths != null) {
                             // Append the path so files placed in the app's base directory will
                             // override the external path
                             layerPaths += paths + ":";
                         }
                     }

                     String layers = coreSettings.getString(Settings.Global.GPU_DEBUG_LAYERS);

                     Log.i(TAG, "Vulkan debug layer list: " + layers);
                     if (layers != null && !layers.isEmpty()) {
                         setDebugLayers(layers);
                     }

                     String layersGLES =
                             coreSettings.getString(Settings.Global.GPU_DEBUG_LAYERS_GLES);

                     Log.i(TAG, "GLES debug layer list: " + layersGLES);
                     if (layersGLES != null && !layersGLES.isEmpty()) {
                         setDebugLayersGLES(layersGLES);
                     }
                 }
             }
         }

         // Include the app's lib directory in all cases
         layerPaths += mLayerPath;

         setLayerPaths(mClassLoader, layerPaths);
     }

     enum OpenGlDriverChoice {
         DEFAULT,
         NATIVE,
         ANGLE
     }

     private static final Map<OpenGlDriverChoice, String> sDriverMap = buildMap();
     private static Map<OpenGlDriverChoice, String> buildMap() {
         Map<OpenGlDriverChoice, String> map = new HashMap<>();
         map.put(OpenGlDriverChoice.DEFAULT, "default");
         map.put(OpenGlDriverChoice.ANGLE, "angle");
         map.put(OpenGlDriverChoice.NATIVE, "native");

         return map;
     }


     private static List<String> getGlobalSettingsString(Bundle bundle, String globalSetting) {
         List<String> valueList = null;
         String settingsValue = bundle.getString(globalSetting);

         if (settingsValue != null) {
             valueList = new ArrayList<>(Arrays.asList(settingsValue.split(",")));
         } else {
             valueList = new ArrayList<>();
         }

         return valueList;
     }

     private static int getGlobalSettingsPkgIndex(String pkgName,
                                                  List<String> globalSettingsDriverPkgs) {
         for (int pkgIndex = 0; pkgIndex < globalSettingsDriverPkgs.size(); pkgIndex++) {
             if (globalSettingsDriverPkgs.get(pkgIndex).equals(pkgName)) {
                 return pkgIndex;
             }
         }

         return -1;
     }

     private static String getDriverForPkg(Bundle bundle, String packageName) {
         String allUseAngle =
                 bundle.getString(Settings.Global.GLOBAL_SETTINGS_ANGLE_GL_DRIVER_ALL_ANGLE);
         if ((allUseAngle != null) && allUseAngle.equals("1")) {
             return sDriverMap.get(OpenGlDriverChoice.ANGLE);
         }

         List<String> globalSettingsDriverPkgs =
                 getGlobalSettingsString(bundle,
                         Settings.Global.GLOBAL_SETTINGS_ANGLE_GL_DRIVER_SELECTION_PKGS);
         List<String> globalSettingsDriverValues =
                 getGlobalSettingsString(bundle,
                         Settings.Global.GLOBAL_SETTINGS_ANGLE_GL_DRIVER_SELECTION_VALUES);

         // Make sure we have a good package name
         if ((packageName == null) || (packageName.isEmpty())) {
             return sDriverMap.get(OpenGlDriverChoice.DEFAULT);
         }
         // Make sure we have good settings to use
         if (globalSettingsDriverPkgs.size() != globalSettingsDriverValues.size()) {
             Log.w(TAG,
                     "Global.Settings values are invalid: "
                         + "globalSettingsDriverPkgs.size = "
                             + globalSettingsDriverPkgs.size() + ", "
                         + "globalSettingsDriverValues.size = "
                             + globalSettingsDriverValues.size());
             return sDriverMap.get(OpenGlDriverChoice.DEFAULT);
         }

         int pkgIndex = getGlobalSettingsPkgIndex(packageName, globalSettingsDriverPkgs);

         if (pkgIndex < 0) {
             return sDriverMap.get(OpenGlDriverChoice.DEFAULT);
         }

         return globalSettingsDriverValues.get(pkgIndex);
     }

     /**
      * Get the ANGLE package name.
      */
     private String getAnglePackageName(Context context) {
         Intent intent = new Intent(ACTION_ANGLE_FOR_ANDROID);

         List<ResolveInfo> resolveInfos = context.getPackageManager()
                 .queryIntentActivities(intent, PackageManager.MATCH_SYSTEM_ONLY);
         if (resolveInfos.size() != 1) {
             Log.e(TAG, "Invalid number of ANGLE packages. Required: 1, Found: "
                     + resolveInfos.size());
             for (ResolveInfo resolveInfo : resolveInfos) {
                 Log.e(TAG, "Found ANGLE package: " + resolveInfo.activityInfo.packageName);
             }
             return "";
         }

         // Must be exactly 1 ANGLE PKG found to get here.
         return resolveInfos.get(0).activityInfo.packageName;
     }

     /**
      * Attempt to setup ANGLE with a temporary rules file.
      * True: Temporary rules file was loaded.
      * False: Temporary rules file was *not* loaded.
      */
     private boolean setupAngleWithTempRulesFile(Context context,
                                                 String packageName,
                                                 String paths,
                                                 String devOptIn) {
         // Check for temporary rules if debuggable or root
         if (!isDebuggable(context) && !(getCanLoadSystemLibraries() == 1)) {
             Log.v(TAG, "Skipping loading temporary rules file");
             return false;
         }

         String angleTempRules = SystemProperties.get(ANGLE_TEMP_RULES);

         if ((angleTempRules == null) || angleTempRules.isEmpty()) {
             Log.v(TAG, "System property '" + ANGLE_TEMP_RULES + "' is not set or is empty");
             return false;
         }

         Log.i(TAG, "Detected system property " + ANGLE_TEMP_RULES + ": " + angleTempRules);

         File tempRulesFile = new File(angleTempRules);
         if (tempRulesFile.exists()) {
             Log.i(TAG, angleTempRules + " exists, loading file.");
             try {
                 FileInputStream stream = new FileInputStream(angleTempRules);

                 try {
                     FileDescriptor rulesFd = stream.getFD();
                     long rulesOffset = 0;
                     long rulesLength = stream.getChannel().size();
                     Log.i(TAG, "Loaded temporary ANGLE rules from " + angleTempRules);

                     setAngleInfo(paths, packageName, devOptIn, rulesFd, rulesOffset, rulesLength);

                     stream.close();

                     // We successfully setup ANGLE, so return with good status
                     return true;
                 } catch (IOException e) {
                     Log.w(TAG, "Hit IOException thrown by FileInputStream: " + e);
                 }
             } catch (FileNotFoundException e) {
                 Log.w(TAG, "Temp ANGLE rules file not found: " + e);
             } catch (SecurityException e) {
                 Log.w(TAG, "Temp ANGLE rules file not accessible: " + e);
             }
         }

         return false;
     }

     /**
      * Attempt to setup ANGLE with a (temporary) default rules file: b/121153494
      * True: Rules file was loaded.
      * False: Rules file was *not* loaded.
      */
     private boolean setupAngleRulesDebug(String packageName, String paths, String devOptIn) {
         // b/121153494
         // Skip APK rules file checking.
         if (!DEBUG) {
             Log.v(TAG, "Skipping loading the rules file.");
             // Fill in some default values for now, so the loader can get an answer when it asks.
             // Most importantly, we need to indicate which app we are init'ing and what the
             // developer options for it are so we can turn on ANGLE if needed.
             setAngleInfo(paths, packageName, devOptIn, null, 0, 0);
             return true;
         }

         return false;
     }

     /**
      * Attempt to setup ANGLE with a rules file loaded from the ANGLE APK.
      * True: APK rules file was loaded.
      * False: APK rules file was *not* loaded.
      */
     private boolean setupAngleRulesApk(String anglePkgName,
             ApplicationInfo angleInfo,
             Context context,
             String packageName,
             String paths,
             String devOptIn) {
         // Pass the rules file to loader for ANGLE decisions
         try {
             AssetManager angleAssets =
                     context.getPackageManager().getResourcesForApplication(angleInfo).getAssets();

             try {
                 AssetFileDescriptor assetsFd = angleAssets.openFd(ANGLE_RULES_FILE);

                 setAngleInfo(paths, packageName, devOptIn, assetsFd.getFileDescriptor(),
                         assetsFd.getStartOffset(), assetsFd.getLength());

                 assetsFd.close();

                 return true;
             } catch (IOException e) {
                 Log.w(TAG, "Failed to get AssetFileDescriptor for " + ANGLE_RULES_FILE
                         + " from '" + anglePkgName + "': " + e);
             }
         } catch (PackageManager.NameNotFoundException e) {
             Log.w(TAG, "Failed to get AssetManager for '" + anglePkgName + "': " + e);
         }

         return false;
     }

     /**
      * Pass ANGLE details down to trigger enable logic
      */
     public void setupAngle(Context context, Bundle bundle, String packageName) {
         String devOptIn = getDriverForPkg(bundle, packageName);

         if (DEBUG) {
             Log.v(TAG, "ANGLE Developer option for '" + packageName + "' "
                     + "set to: '" + devOptIn + "'");
         }

         String anglePkgName = getAnglePackageName(context);
         if (anglePkgName.isEmpty()) {
             Log.e(TAG, "Failed to find ANGLE package.");
             return;
         }

         ApplicationInfo angleInfo;
         try {
             angleInfo = context.getPackageManager().getApplicationInfo(anglePkgName,
                 PackageManager.MATCH_SYSTEM_ONLY);
         } catch (PackageManager.NameNotFoundException e) {
             Log.w(TAG, "ANGLE package '" + anglePkgName + "' not installed");
             return;
         }

         String abi = chooseAbi(angleInfo);

         // Build a path that includes installed native libs and APK
         String paths = angleInfo.nativeLibraryDir
                 + File.pathSeparator
                 + angleInfo.sourceDir
                 + "!/lib/"
                 + abi;

         if (DEBUG) Log.v(TAG, "ANGLE package libs: " + paths);

         if (setupAngleWithTempRulesFile(context, packageName, paths, devOptIn)) {
             // We setup ANGLE with a temp rules file, so we're done here.
             return;
         }

         // b/121153494
         if (setupAngleRulesDebug(packageName, paths, devOptIn)) {
             // We setup ANGLE with defaults, so we're done here.
             return;
         }

         if (setupAngleRulesApk(anglePkgName, angleInfo, context, packageName, paths, devOptIn)) {
             // We setup ANGLE with rules from the APK, so we're done here.
             return;
         }
     }

     /**
      * Choose whether the current process should use the builtin or an updated driver.
      */
     private static void chooseDriver(Context context, Bundle coreSettings) {
         String driverPackageName = SystemProperties.get(PROPERTY_GFX_DRIVER);
         if (driverPackageName == null || driverPackageName.isEmpty()) {
             return;
         }

         // To minimize risk of driver updates crippling the device beyond user repair, never use an
         // updated driver for privileged or non-updated system apps. Presumably pre-installed apps
         // were tested thoroughly with the pre-installed driver.
         ApplicationInfo ai = context.getApplicationInfo();
         if (ai.isPrivilegedApp() || (ai.isSystemApp() && !ai.isUpdatedSystemApp())) {
             if (DEBUG) Log.v(TAG, "ignoring driver package for privileged/non-updated system app");
             return;
         }

         if (getGlobalSettingsString(coreSettings, Settings.Global.GUP_DEV_OPT_OUT_APPS)
                         .contains(ai.packageName)) {
             if (DEBUG) {
                 Log.w(TAG, ai.packageName + " opts out from GUP.");
             }
             return;
         }

         if (!getGlobalSettingsString(coreSettings, Settings.Global.GUP_DEV_OPT_IN_APPS)
                         .contains(ai.packageName)
                 && !onWhitelist(context, driverPackageName, ai.packageName)) {
             if (DEBUG) {
                 Log.w(TAG, ai.packageName + " is not on the whitelist.");
             }
             return;
         }

         ApplicationInfo driverInfo;
         try {
             driverInfo = context.getPackageManager().getApplicationInfo(driverPackageName,
                     PackageManager.MATCH_SYSTEM_ONLY);
         } catch (PackageManager.NameNotFoundException e) {
             Log.w(TAG, "driver package '" + driverPackageName + "' not installed");
             return;
         }

         // O drivers are restricted to the sphal linker namespace, so don't try to use
         // packages unless they declare they're compatible with that restriction.
         if (driverInfo.targetSdkVersion < Build.VERSION_CODES.O) {
             if (DEBUG) {
                 Log.w(TAG, "updated driver package is not known to be compatible with O");
             }
             return;
         }

         String abi = chooseAbi(driverInfo);
         if (abi == null) {
             if (DEBUG) {
                 // This is the normal case for the pre-installed empty driver package, don't spam
                 if (driverInfo.isUpdatedSystemApp()) {
                     Log.w(TAG, "updated driver package has no compatible native libraries");
                 }
             }
             return;
         }

         StringBuilder sb = new StringBuilder();
         sb.append(driverInfo.nativeLibraryDir)
           .append(File.pathSeparator);
         sb.append(driverInfo.sourceDir)
           .append("!/lib/")
           .append(abi);
         String paths = sb.toString();

         if (DEBUG) Log.v(TAG, "gfx driver package libs: " + paths);
         setDriverPath(paths);
     }

     /**
      * Start a background thread to initialize EGL.
      *
      * Initializing EGL involves loading and initializing the graphics driver. Some drivers take
      * several 10s of milliseconds to do this, so doing it on-demand when an app tries to render
      * its first frame adds directly to user-visible app launch latency. By starting it earlier
      * on a separate thread, it can usually be finished well before the UI is ready to be drawn.
      *
      * Should only be called after chooseDriver().
      */
     public static void earlyInitEGL() {
         Thread eglInitThread = new Thread(
                 () -> {
                     EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
                 },
                 "EGL Init");
         eglInitThread.start();
     }

     private static String chooseAbi(ApplicationInfo ai) {
         String isa = VMRuntime.getCurrentInstructionSet();
         if (ai.primaryCpuAbi != null &&
                 isa.equals(VMRuntime.getInstructionSet(ai.primaryCpuAbi))) {
             return ai.primaryCpuAbi;
         }
         if (ai.secondaryCpuAbi != null &&
                 isa.equals(VMRuntime.getInstructionSet(ai.secondaryCpuAbi))) {
             return ai.secondaryCpuAbi;
         }
         return null;
     }

     private static boolean onWhitelist(Context context, String driverPackageName,
             String applicationPackageName) {
         try {
             Context driverContext = context.createPackageContext(driverPackageName,
                                                                  Context.CONTEXT_RESTRICTED);
             AssetManager assets = driverContext.getAssets();
             InputStream stream = assets.open(GUP_WHITELIST_FILENAME);
             BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
             for (String packageName; (packageName = reader.readLine()) != null; ) {
                 if (packageName.equals(applicationPackageName)) {
                     return true;
                 }
             }
         } catch (PackageManager.NameNotFoundException e) {
             if (DEBUG) {
                 Log.w(TAG, "driver package '" + driverPackageName + "' not installed");
             }
         } catch (IOException e) {
             if (DEBUG) {
                 Log.w(TAG, "Failed to load whitelist driver package, abort.");
             }
         }
         return false;
     }

     private static native int getCanLoadSystemLibraries();
     private static native void setLayerPaths(ClassLoader classLoader, String layerPaths);
     private static native void setDebugLayers(String layers);
     private static native void setDebugLayersGLES(String layers);
     private static native void setDriverPath(String path);
     private static native void setAngleInfo(String path, String appPackage,
                                             String devOptIn, FileDescriptor rulesFd,
                                             long rulesOffset, long rulesLength);
 }
	/*
	* Copyright 2016 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.
	*/

	package android.os;

	import android.content.Context;
	import android.content.Intent;
	import android.content.pm.ApplicationInfo;
	import android.content.pm.PackageManager;
	import android.content.pm.ResolveInfo;
	import android.content.res.AssetFileDescriptor;
	import android.content.res.AssetManager;
	import android.opengl.EGL14;
	import android.provider.Settings;
	import android.util.Log;

	import dalvik.system.VMRuntime;

	import java.io.BufferedReader;
	import java.io.File;
	import java.io.FileDescriptor;
	import java.io.FileInputStream;
	import java.io.FileNotFoundException;
	import java.io.IOException;
	import java.io.InputStream;
	import java.io.InputStreamReader;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;

	/** @hide */
	public class GraphicsEnvironment {

	private static final GraphicsEnvironment sInstance = new GraphicsEnvironment();

	/**
	* Returns the shared {@link GraphicsEnvironment} instance.
	*/
	public static GraphicsEnvironment getInstance() {
	return sInstance;
	}

	private static final boolean DEBUG = false;
	private static final String TAG = "GraphicsEnvironment";
	private static final String PROPERTY_GFX_DRIVER = "ro.gfx.driver.0";
	private static final String GUP_WHITELIST_FILENAME = "whitelist.txt";
	private static final String ANGLE_RULES_FILE = "a4a_rules.json";
	private static final String ANGLE_TEMP_RULES = "debug.angle.rules";
	private static final String ACTION_ANGLE_FOR_ANDROID = "android.app.action.ANGLE_FOR_ANDROID";

	private ClassLoader mClassLoader;
	private String mLayerPath;
	private String mDebugLayerPath;

	/**
	* Set up GraphicsEnvironment
	*/
	public void setup(Context context, Bundle coreSettings) {
	setupGpuLayers(context, coreSettings);
	setupAngle(context, coreSettings, context.getPackageName());
	chooseDriver(context, coreSettings);
	}

	/**
	* Check whether application is debuggable
	*/
	private static boolean isDebuggable(Context context) {
	return (context.getApplicationInfo().flags & ApplicationInfo.FLAG_DEBUGGABLE) > 0;
	}

	/**
	* Store the layer paths available to the loader.
	*/
	public void setLayerPaths(ClassLoader classLoader,
	String layerPath,
	String debugLayerPath) {
	// We have to store these in the class because they are set up before we
	// have access to the Context to properly set up GraphicsEnvironment
	mClassLoader = classLoader;
	mLayerPath = layerPath;
	mDebugLayerPath = debugLayerPath;
	}

	/**
	* Return the debug layer app's on-disk and in-APK lib directories
	*/
	private static String getDebugLayerAppPaths(Context context, String app) {
	ApplicationInfo appInfo;
	try {
	appInfo = context.getPackageManager().getApplicationInfo(
	app, PackageManager.MATCH_ALL);
	} catch (PackageManager.NameNotFoundException e) {
	Log.w(TAG, "Debug layer app '" + app + "' not installed");

	return null;
	}

	String abi = chooseAbi(appInfo);

	StringBuilder sb = new StringBuilder();
	sb.append(appInfo.nativeLibraryDir)
	.append(File.pathSeparator);
	sb.append(appInfo.sourceDir)
	.append("!/lib/")
	.append(abi);
	String paths = sb.toString();

	if (DEBUG) Log.v(TAG, "Debug layer app libs: " + paths);

	return paths;
	}

	/**
	* Set up layer search paths for all apps
	* If debuggable, check for additional debug settings
	*/
	private void setupGpuLayers(Context context, Bundle coreSettings) {

	String layerPaths = "";

	// Only enable additional debug functionality if the following conditions are met:
	// 1. App is debuggable or device is rooted
	// 2. ENABLE_GPU_DEBUG_LAYERS is true
	// 3. Package name is equal to GPU_DEBUG_APP

	if (isDebuggable(context) \|\| (getCanLoadSystemLibraries() == 1)) {

	int enable = coreSettings.getInt(Settings.Global.ENABLE_GPU_DEBUG_LAYERS, 0);

	if (enable != 0) {

	String gpuDebugApp = coreSettings.getString(Settings.Global.GPU_DEBUG_APP);

	String packageName = context.getPackageName();

	if ((gpuDebugApp != null && packageName != null)
	&& (!gpuDebugApp.isEmpty() && !packageName.isEmpty())
	&& gpuDebugApp.equals(packageName)) {
	Log.i(TAG, "GPU debug layers enabled for " + packageName);

	// Prepend the debug layer path as a searchable path.
	// This will ensure debug layers added will take precedence over
	// the layers specified by the app.
	layerPaths = mDebugLayerPath + ":";


	// If there is a debug layer app specified, add its path.
	String gpuDebugLayerApp =
	coreSettings.getString(Settings.Global.GPU_DEBUG_LAYER_APP);

	if (gpuDebugLayerApp != null && !gpuDebugLayerApp.isEmpty()) {
	Log.i(TAG, "GPU debug layer app: " + gpuDebugLayerApp);
	String paths = getDebugLayerAppPaths(context, gpuDebugLayerApp);
	if (paths != null) {
	// Append the path so files placed in the app's base directory will
	// override the external path
	layerPaths += paths + ":";
	}
	}

	String layers = coreSettings.getString(Settings.Global.GPU_DEBUG_LAYERS);

	Log.i(TAG, "Vulkan debug layer list: " + layers);
	if (layers != null && !layers.isEmpty()) {
	setDebugLayers(layers);
	}

	String layersGLES =
	coreSettings.getString(Settings.Global.GPU_DEBUG_LAYERS_GLES);

	Log.i(TAG, "GLES debug layer list: " + layersGLES);
	if (layersGLES != null && !layersGLES.isEmpty()) {
	setDebugLayersGLES(layersGLES);
	}
	}
	}
	}

	// Include the app's lib directory in all cases
	layerPaths += mLayerPath;

	setLayerPaths(mClassLoader, layerPaths);
	}

	enum OpenGlDriverChoice {
	DEFAULT,
	NATIVE,
	ANGLE
	}

	private static final Map<OpenGlDriverChoice, String> sDriverMap = buildMap();
	private static Map<OpenGlDriverChoice, String> buildMap() {
	Map<OpenGlDriverChoice, String> map = new HashMap<>();
	map.put(OpenGlDriverChoice.DEFAULT, "default");
	map.put(OpenGlDriverChoice.ANGLE, "angle");
	map.put(OpenGlDriverChoice.NATIVE, "native");

	return map;
	}


	private static List<String> getGlobalSettingsString(Bundle bundle, String globalSetting) {
	List<String> valueList = null;
	String settingsValue = bundle.getString(globalSetting);

	if (settingsValue != null) {
	valueList = new ArrayList<>(Arrays.asList(settingsValue.split(",")));
	} else {
	valueList = new ArrayList<>();
	}

	return valueList;
	}

	private static int getGlobalSettingsPkgIndex(String pkgName,
	List<String> globalSettingsDriverPkgs) {
	for (int pkgIndex = 0; pkgIndex < globalSettingsDriverPkgs.size(); pkgIndex++) {
	if (globalSettingsDriverPkgs.get(pkgIndex).equals(pkgName)) {
	return pkgIndex;
	}
	}

	return -1;
	}

	private static String getDriverForPkg(Bundle bundle, String packageName) {
	String allUseAngle =
	bundle.getString(Settings.Global.GLOBAL_SETTINGS_ANGLE_GL_DRIVER_ALL_ANGLE);
	if ((allUseAngle != null) && allUseAngle.equals("1")) {
	return sDriverMap.get(OpenGlDriverChoice.ANGLE);
	}

	List<String> globalSettingsDriverPkgs =
	getGlobalSettingsString(bundle,
	Settings.Global.GLOBAL_SETTINGS_ANGLE_GL_DRIVER_SELECTION_PKGS);
	List<String> globalSettingsDriverValues =
	getGlobalSettingsString(bundle,
	Settings.Global.GLOBAL_SETTINGS_ANGLE_GL_DRIVER_SELECTION_VALUES);

	// Make sure we have a good package name
	if ((packageName == null) \|\| (packageName.isEmpty())) {
	return sDriverMap.get(OpenGlDriverChoice.DEFAULT);
	}
	// Make sure we have good settings to use
	if (globalSettingsDriverPkgs.size() != globalSettingsDriverValues.size()) {
	Log.w(TAG,
	"Global.Settings values are invalid: "
	+ "globalSettingsDriverPkgs.size = "
	+ globalSettingsDriverPkgs.size() + ", "
	+ "globalSettingsDriverValues.size = "
	+ globalSettingsDriverValues.size());
	return sDriverMap.get(OpenGlDriverChoice.DEFAULT);
	}

	int pkgIndex = getGlobalSettingsPkgIndex(packageName, globalSettingsDriverPkgs);

	if (pkgIndex < 0) {
	return sDriverMap.get(OpenGlDriverChoice.DEFAULT);
	}

	return globalSettingsDriverValues.get(pkgIndex);
	}

	/**
	* Get the ANGLE package name.
	*/
	private String getAnglePackageName(Context context) {
	Intent intent = new Intent(ACTION_ANGLE_FOR_ANDROID);

	List<ResolveInfo> resolveInfos = context.getPackageManager()
	.queryIntentActivities(intent, PackageManager.MATCH_SYSTEM_ONLY);
	if (resolveInfos.size() != 1) {
	Log.e(TAG, "Invalid number of ANGLE packages. Required: 1, Found: "
	+ resolveInfos.size());
	for (ResolveInfo resolveInfo : resolveInfos) {
	Log.e(TAG, "Found ANGLE package: " + resolveInfo.activityInfo.packageName);
	}
	return "";
	}

	// Must be exactly 1 ANGLE PKG found to get here.
	return resolveInfos.get(0).activityInfo.packageName;
	}

	/**
	* Attempt to setup ANGLE with a temporary rules file.
	* True: Temporary rules file was loaded.
	* False: Temporary rules file was not loaded.
	*/
	private boolean setupAngleWithTempRulesFile(Context context,
	String packageName,
	String paths,
	String devOptIn) {
	// Check for temporary rules if debuggable or root
	if (!isDebuggable(context) && !(getCanLoadSystemLibraries() == 1)) {
	Log.v(TAG, "Skipping loading temporary rules file");
	return false;
	}

	String angleTempRules = SystemProperties.get(ANGLE_TEMP_RULES);

	if ((angleTempRules == null) \|\| angleTempRules.isEmpty()) {
	Log.v(TAG, "System property '" + ANGLE_TEMP_RULES + "' is not set or is empty");
	return false;
	}

	Log.i(TAG, "Detected system property " + ANGLE_TEMP_RULES + ": " + angleTempRules);

	File tempRulesFile = new File(angleTempRules);
	if (tempRulesFile.exists()) {
	Log.i(TAG, angleTempRules + " exists, loading file.");
	try {
	FileInputStream stream = new FileInputStream(angleTempRules);

	try {
	FileDescriptor rulesFd = stream.getFD();
	long rulesOffset = 0;
	long rulesLength = stream.getChannel().size();
	Log.i(TAG, "Loaded temporary ANGLE rules from " + angleTempRules);

	setAngleInfo(paths, packageName, devOptIn, rulesFd, rulesOffset, rulesLength);

	stream.close();

	// We successfully setup ANGLE, so return with good status
	return true;
	} catch (IOException e) {
	Log.w(TAG, "Hit IOException thrown by FileInputStream: " + e);
	}
	} catch (FileNotFoundException e) {
	Log.w(TAG, "Temp ANGLE rules file not found: " + e);
	} catch (SecurityException e) {
	Log.w(TAG, "Temp ANGLE rules file not accessible: " + e);
	}
	}

	return false;
	}

	/**
	* Attempt to setup ANGLE with a (temporary) default rules file: b/121153494
	* True: Rules file was loaded.
	* False: Rules file was not loaded.
	*/
	private boolean setupAngleRulesDebug(String packageName, String paths, String devOptIn) {
	// b/121153494
	// Skip APK rules file checking.
	if (!DEBUG) {
	Log.v(TAG, "Skipping loading the rules file.");
	// Fill in some default values for now, so the loader can get an answer when it asks.
	// Most importantly, we need to indicate which app we are init'ing and what the
	// developer options for it are so we can turn on ANGLE if needed.
	setAngleInfo(paths, packageName, devOptIn, null, 0, 0);
	return true;
	}

	return false;
	}

	/**
	* Attempt to setup ANGLE with a rules file loaded from the ANGLE APK.
	* True: APK rules file was loaded.
	* False: APK rules file was not loaded.
	*/
	private boolean setupAngleRulesApk(String anglePkgName,
	ApplicationInfo angleInfo,
	Context context,
	String packageName,
	String paths,
	String devOptIn) {
	// Pass the rules file to loader for ANGLE decisions
	try {
	AssetManager angleAssets =
	context.getPackageManager().getResourcesForApplication(angleInfo).getAssets();

	try {
	AssetFileDescriptor assetsFd = angleAssets.openFd(ANGLE_RULES_FILE);

	setAngleInfo(paths, packageName, devOptIn, assetsFd.getFileDescriptor(),
	assetsFd.getStartOffset(), assetsFd.getLength());

	assetsFd.close();

	return true;
	} catch (IOException e) {
	Log.w(TAG, "Failed to get AssetFileDescriptor for " + ANGLE_RULES_FILE
	+ " from '" + anglePkgName + "': " + e);
	}
	} catch (PackageManager.NameNotFoundException e) {
	Log.w(TAG, "Failed to get AssetManager for '" + anglePkgName + "': " + e);
	}

	return false;
	}

	/**
	* Pass ANGLE details down to trigger enable logic
	*/
	public void setupAngle(Context context, Bundle bundle, String packageName) {
	String devOptIn = getDriverForPkg(bundle, packageName);

	if (DEBUG) {
	Log.v(TAG, "ANGLE Developer option for '" + packageName + "' "
	+ "set to: '" + devOptIn + "'");
	}

	String anglePkgName = getAnglePackageName(context);
	if (anglePkgName.isEmpty()) {
	Log.e(TAG, "Failed to find ANGLE package.");
	return;
	}

	ApplicationInfo angleInfo;
	try {
	angleInfo = context.getPackageManager().getApplicationInfo(anglePkgName,
	PackageManager.MATCH_SYSTEM_ONLY);
	} catch (PackageManager.NameNotFoundException e) {
	Log.w(TAG, "ANGLE package '" + anglePkgName + "' not installed");
	return;
	}

	String abi = chooseAbi(angleInfo);

	// Build a path that includes installed native libs and APK
	String paths = angleInfo.nativeLibraryDir
	+ File.pathSeparator
	+ angleInfo.sourceDir
	+ "!/lib/"
	+ abi;

	if (DEBUG) Log.v(TAG, "ANGLE package libs: " + paths);

	if (setupAngleWithTempRulesFile(context, packageName, paths, devOptIn)) {
	// We setup ANGLE with a temp rules file, so we're done here.
	return;
	}

	// b/121153494
	if (setupAngleRulesDebug(packageName, paths, devOptIn)) {
	// We setup ANGLE with defaults, so we're done here.
	return;
	}

	if (setupAngleRulesApk(anglePkgName, angleInfo, context, packageName, paths, devOptIn)) {
	// We setup ANGLE with rules from the APK, so we're done here.
	return;
	}
	}

	/**
	* Choose whether the current process should use the builtin or an updated driver.
	*/
	private static void chooseDriver(Context context, Bundle coreSettings) {
	String driverPackageName = SystemProperties.get(PROPERTY_GFX_DRIVER);
	if (driverPackageName == null \|\| driverPackageName.isEmpty()) {
	return;
	}

	// To minimize risk of driver updates crippling the device beyond user repair, never use an
	// updated driver for privileged or non-updated system apps. Presumably pre-installed apps
	// were tested thoroughly with the pre-installed driver.
	ApplicationInfo ai = context.getApplicationInfo();
	if (ai.isPrivilegedApp() \|\| (ai.isSystemApp() && !ai.isUpdatedSystemApp())) {
	if (DEBUG) Log.v(TAG, "ignoring driver package for privileged/non-updated system app");
	return;
	}

	if (getGlobalSettingsString(coreSettings, Settings.Global.GUP_DEV_OPT_OUT_APPS)
	.contains(ai.packageName)) {
	if (DEBUG) {
	Log.w(TAG, ai.packageName + " opts out from GUP.");
	}
	return;
	}

	if (!getGlobalSettingsString(coreSettings, Settings.Global.GUP_DEV_OPT_IN_APPS)
	.contains(ai.packageName)
	&& !onWhitelist(context, driverPackageName, ai.packageName)) {
	if (DEBUG) {
	Log.w(TAG, ai.packageName + " is not on the whitelist.");
	}
	return;
	}

	ApplicationInfo driverInfo;
	try {
	driverInfo = context.getPackageManager().getApplicationInfo(driverPackageName,
	PackageManager.MATCH_SYSTEM_ONLY);
	} catch (PackageManager.NameNotFoundException e) {
	Log.w(TAG, "driver package '" + driverPackageName + "' not installed");
	return;
	}

	// O drivers are restricted to the sphal linker namespace, so don't try to use
	// packages unless they declare they're compatible with that restriction.
	if (driverInfo.targetSdkVersion < Build.VERSION_CODES.O) {
	if (DEBUG) {
	Log.w(TAG, "updated driver package is not known to be compatible with O");
	}
	return;
	}

	String abi = chooseAbi(driverInfo);
	if (abi == null) {
	if (DEBUG) {
	// This is the normal case for the pre-installed empty driver package, don't spam
	if (driverInfo.isUpdatedSystemApp()) {
	Log.w(TAG, "updated driver package has no compatible native libraries");
	}
	}
	return;
	}

	StringBuilder sb = new StringBuilder();
	sb.append(driverInfo.nativeLibraryDir)
	.append(File.pathSeparator);
	sb.append(driverInfo.sourceDir)
	.append("!/lib/")
	.append(abi);
	String paths = sb.toString();

	if (DEBUG) Log.v(TAG, "gfx driver package libs: " + paths);
	setDriverPath(paths);
	}

	/**
	* Start a background thread to initialize EGL.
	*
	* Initializing EGL involves loading and initializing the graphics driver. Some drivers take
	* several 10s of milliseconds to do this, so doing it on-demand when an app tries to render
	* its first frame adds directly to user-visible app launch latency. By starting it earlier
	* on a separate thread, it can usually be finished well before the UI is ready to be drawn.
	*
	* Should only be called after chooseDriver().
	*/
	public static void earlyInitEGL() {
	Thread eglInitThread = new Thread(
	() -> {
	EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
	},
	"EGL Init");
	eglInitThread.start();
	}

	private static String chooseAbi(ApplicationInfo ai) {
	String isa = VMRuntime.getCurrentInstructionSet();
	if (ai.primaryCpuAbi != null &&
	isa.equals(VMRuntime.getInstructionSet(ai.primaryCpuAbi))) {
	return ai.primaryCpuAbi;
	}
	if (ai.secondaryCpuAbi != null &&
	isa.equals(VMRuntime.getInstructionSet(ai.secondaryCpuAbi))) {
	return ai.secondaryCpuAbi;
	}
	return null;
	}

	private static boolean onWhitelist(Context context, String driverPackageName,
	String applicationPackageName) {
	try {
	Context driverContext = context.createPackageContext(driverPackageName,
	Context.CONTEXT_RESTRICTED);
	AssetManager assets = driverContext.getAssets();
	InputStream stream = assets.open(GUP_WHITELIST_FILENAME);
	BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
	for (String packageName; (packageName = reader.readLine()) != null; ) {
	if (packageName.equals(applicationPackageName)) {
	return true;
	}
	}
	} catch (PackageManager.NameNotFoundException e) {
	if (DEBUG) {
	Log.w(TAG, "driver package '" + driverPackageName + "' not installed");
	}
	} catch (IOException e) {
	if (DEBUG) {
	Log.w(TAG, "Failed to load whitelist driver package, abort.");
	}
	}
	return false;
	}

	private static native int getCanLoadSystemLibraries();
	private static native void setLayerPaths(ClassLoader classLoader, String layerPaths);
	private static native void setDebugLayers(String layers);
	private static native void setDebugLayersGLES(String layers);
	private static native void setDriverPath(String path);
	private static native void setAngleInfo(String path, String appPackage,
	String devOptIn, FileDescriptor rulesFd,
	long rulesOffset, long rulesLength);
	}