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Preload font files based on device locale

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Bug: 181692010
Test: manually done
Change-Id: If4d03542fd905aed0e4578486dcf68d1535676f5
This commit is contained in:
Seigo Nonaka
2021-03-23 18:28:25 -07:00
parent 19d042f7b9
commit 7a1c1b2cfc
1 changed files with 26 additions and 1 deletions
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27
graphics/java/android/graphics/Typeface.java
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@@ -34,9 +34,11 @@ import android.graphics.fonts.FontFamily;
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;
@@ -45,6 +47,7 @@ import android.system.OsConstants;
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;
@@ -1375,13 +1378,35 @@ public class Typeface {
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);
}
}