Preload minikin LocaleListCache in Zygote.

This saves ~31 KB per process on oriole.

Bug: 174672300
Test: atest CtsGraphicsTestCases:android.graphics.cts.TypefaceTest
Change-Id: Ic70ea842985a0aca441a31327e41980ed47bc961

graphics/java/android/graphics/Typeface.java

@@ -57,6 +57,7 @@ import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.util.Preconditions;
 
 import dalvik.annotation.optimization.CriticalNative;
+import dalvik.annotation.optimization.FastNative;
 
 import libcore.util.NativeAllocationRegistry;
 
@@ -1395,6 +1396,9 @@ public class Typeface {
         FontConfig config = SystemFonts.getSystemPreinstalledFontConfig();
         for (int i = 0; i < config.getFontFamilies().size(); ++i) {
             FontConfig.FontFamily family = config.getFontFamilies().get(i);
+            if (!family.getLocaleList().isEmpty()) {
+                nativeRegisterLocaleList(family.getLocaleList().toLanguageTags());
+            }
             boolean loadFamily = false;
             for (int j = 0; j < family.getLocaleList().size(); ++j) {
                 String fontScript = ULocale.addLikelySubtags(
@@ -1541,4 +1545,7 @@ public class Typeface {
     private static native void nativeAddFontCollections(long nativePtr);
 
     private static native void nativeWarmUpCache(String fileName);
+
+    @FastNative
+    private static native void nativeRegisterLocaleList(String locales);
 }

libs/hwui/jni/Typeface.cpp

@@ -20,18 +20,20 @@
 #include <minikin/FontCollection.h>
 #include <minikin/FontFamily.h>
 #include <minikin/FontFileParser.h>
+#include <minikin/LocaleList.h>
 #include <minikin/SystemFonts.h>
 #include <nativehelper/ScopedPrimitiveArray.h>
 #include <nativehelper/ScopedUtfChars.h>
+
+#include <mutex>
+#include <unordered_map>
+
 #include "FontUtils.h"
 #include "GraphicsJNI.h"
 #include "SkData.h"
 #include "SkTypeface.h"
 #include "fonts/Font.h"
 
-#include <mutex>
-#include <unordered_map>
-
 #ifdef __ANDROID__
 #include <sys/stat.h>
 #endif
@@ -380,6 +382,12 @@ static void Typeface_addFontCollection(CRITICAL_JNI_PARAMS_COMMA jlong faceHandl
     minikin::SystemFonts::addFontMap(std::move(collection));
 }
 
+// Fast Native
+static void Typeface_registerLocaleList(JNIEnv* env, jobject, jstring jLocales) {
+    ScopedUtfChars locales(env, jLocales);
+    minikin::registerLocaleList(locales.c_str());
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 static const JNINativeMethod gTypefaceMethods[] = {
@@ -405,6 +413,7 @@ static const JNINativeMethod gTypefaceMethods[] = {
         {"nativeGetFamily", "(JI)J", (void*)Typeface_getFamily},
         {"nativeWarmUpCache", "(Ljava/lang/String;)V", (void*)Typeface_warmUpCache},
         {"nativeAddFontCollections", "(J)V", (void*)Typeface_addFontCollection},
+        {"nativeRegisterLocaleList", "(Ljava/lang/String;)V", (void*)Typeface_registerLocaleList},
 };
 
 int register_android_graphics_Typeface(JNIEnv* env)