Merge "Preload font files based on device locale" into sc-dev

import android.graphics.fonts.FontStyle;

import android.graphics.fonts.FontVariationAxis;

import android.graphics.fonts.SystemFonts;

import android.icu.util.ULocale;

import android.os.Build;

import android.os.ParcelFileDescriptor;

import android.os.SharedMemory;

import android.os.SystemProperties;

import android.os.Trace;

import android.provider.FontRequest;

import android.provider.FontsContract;

import android.text.FontConfig;

import android.util.ArrayMap;

import android.util.Base64;

import android.util.Log;

import android.util.LongSparseArray;

import android.util.LruCache;

import android.util.SparseArray;

    static {

        // Preload Roboto-Regular.ttf in Zygote for improving app launch performance.

        // TODO: add new attribute to fonts.xml to preload fonts in Zygote.

        preloadFontFile("/system/fonts/Roboto-Regular.ttf");

        String locale = SystemProperties.get("persist.sys.locale", "en-US");

        String script = ULocale.addLikelySubtags(ULocale.forLanguageTag(locale)).getScript();

        FontConfig config = SystemFonts.getSystemPreinstalledFontConfig();

        for (int i = 0; i < config.getFontFamilies().size(); ++i) {

            FontConfig.FontFamily family = config.getFontFamilies().get(i);

            boolean loadFamily = false;

            for (int j = 0; j < family.getLocaleList().size(); ++j) {

                String fontScript = ULocale.addLikelySubtags(

                        ULocale.forLocale(family.getLocaleList().get(j))).getScript();

                loadFamily = fontScript.equals(script);

                if (loadFamily) {

                    break;

                }

            }

            if (loadFamily) {

                for (int j = 0; j < family.getFontList().size(); ++j) {

                    preloadFontFile(family.getFontList().get(j).getFile().getAbsolutePath());

                }

            }

        }

    }

    private static void preloadFontFile(String filePath) {

        File file = new File(filePath);

        if (file.exists()) {

            Log.i(TAG, "Preloading " + file.getAbsolutePath());

            nativeWarmUpCache(filePath);

        }

    }