Prepare switching font loading to system server.

Currently, fonts are loaded in Zygote.
This CL adds a preparation to switch it to system server and
bindApplication(), so that system server will be able to update font map
at runtime.

(1) Zygote will be initialized without fonts.
(2) System server will maintain a serialized font map in ashmem.
(3) Apps will load font map from the ashmem in bindApplication().

The change is guarded by Typeface.ENABLE_LAZY_TYPEFACE_INITIALIZATION,
and the new behavior is disabled by default.
I tested with ENABLE_LAZY_TYPEFACE_INITIALIZATION = true.

Bug: 172891184
Test: atest FrameworksCoreTests:TypefaceTest
Test: atest CtsGraphicsTestCases
Test: atest CtsTextTestCases
Test: atest CtsWidgetTestCases
Change-Id: I40832962a4b27f6160c4dc6268689c52f6a4dd33

1 files changed, 11 insertions, 0 deletions

diff --git a/services/java/com/android/server/SystemServer.java b/services/java/com/android/server/SystemServer.java
index 10b3265cd081..6525e1126478 100644
--- a/services/java/com/android/server/SystemServer.java
+++ b/services/java/com/android/server/SystemServer.java
@@ -47,6 +47,7 @@ import android.content.res.Resources.Theme;
 import android.database.sqlite.SQLiteCompatibilityWalFlags;
 import android.database.sqlite.SQLiteGlobal;
 import android.graphics.GraphicsStatsService;
+import android.graphics.Typeface;
 import android.hardware.display.DisplayManagerInternal;
 import android.net.ConnectivityManager;
 import android.net.ConnectivityModuleConnector;
@@ -120,6 +121,7 @@ import com.android.server.display.color.ColorDisplayService;
 import com.android.server.dreams.DreamManagerService;
 import com.android.server.emergency.EmergencyAffordanceService;
 import com.android.server.gpu.GpuService;
+import com.android.server.graphics.fonts.FontManagerService;
 import com.android.server.hdmi.HdmiControlService;
 import com.android.server.incident.IncidentCompanionService;
 import com.android.server.input.InputManagerService;
@@ -673,6 +675,11 @@ public final class SystemServer implements Dumpable {
             SystemServerInitThreadPool tp = SystemServerInitThreadPool.start();
             mDumper.addDumpable(tp);
 
+            // Load preinstalled system fonts for system server, so that WindowManagerService, etc
+            // can start using Typeface. Note that fonts are required not only for text rendering,
+            // but also for some text operations (e.g. TextUtils.makeSafeForPresentation()).
+            Typeface.loadPreinstalledSystemFontMap();
+
             // Attach JVMTI agent if this is a debuggable build and the system property is set.
             if (Build.IS_DEBUGGABLE) {
                 // Property is of the form "library_path=parameters".
@@ -1604,6 +1611,10 @@ public final class SystemServer implements Dumpable {
             }
             t.traceEnd();
 
+            t.traceBegin("StartFontManagerService");
+            mSystemServiceManager.startService(FontManagerService.Lifecycle.class);
+            t.traceEnd();
+
             t.traceBegin("StartTextServicesManager");
             mSystemServiceManager.startService(TextServicesManagerService.Lifecycle.class);
             t.traceEnd();