Do RS caching the same way HardwareRenderer does.

Eliminates the need for an application context for caching.

Change-Id: I4374738083b5eb4ce983d2cb5409428e3668c423

core/java/android/app/ActivityThread.java

@@ -78,6 +78,7 @@ import android.view.ViewRootImpl;
 import android.view.Window;
 import android.view.WindowManager;
 import android.view.WindowManagerImpl;
+import android.renderscript.RenderScript;
 
 import com.android.internal.os.BinderInternal;
 import com.android.internal.os.RuntimeInit;
@@ -3779,6 +3780,7 @@ public final class ActivityThread {
                 appContext.init(info, null, this);
 
                 HardwareRenderer.setupDiskCache(appContext.getCacheDir());
+                RenderScript.setupDiskCache(appContext.getCacheDir());
             }
         } catch (RemoteException e) {
             // Ignore

graphics/java/android/renderscript/RenderScript.java

@@ -17,6 +17,7 @@
 package android.renderscript;
 
 import java.lang.reflect.Field;
+import java.io.File;
 
 import android.content.Context;
 import android.content.pm.ApplicationInfo;
@@ -82,6 +83,26 @@ public class RenderScript {
     native void nContextInitToClient(int con);
     native void nContextDeinitToClient(int con);
 
+    /**
+     * Name of the file that holds the object cache.
+     */
+    private static final String CACHE_PATH = "com.android.renderscript.cache";
+
+     /**
+     * Sets the directory to use as a persistent storage for the
+     * renderscript object file cache.
+     *
+     * @hide
+     * @param cacheDir A directory the current process can write to
+     */
+
+    static String mCachePath;
+    public static void setupDiskCache(File cacheDir) {
+        File f = new File(cacheDir, CACHE_PATH);
+        mCachePath = f.getAbsolutePath();
+        f.mkdirs();
+    }
+
 
     // Methods below are wrapped to protect the non-threadsafe
     // lockless fifo.

graphics/java/android/renderscript/ScriptC.java

@@ -92,13 +92,9 @@ public class ScriptC extends Script {
             throw new Resources.NotFoundException();
         }
 
-        // E.g, /system/apps/Fountain.apk
-        //String packageName = rs.getApplicationContext().getPackageResourcePath();
-        // For res/raw/fountain.bc, it wil be /com.android.fountain:raw/fountain
         String resName = resources.getResourceEntryName(resourceID);
-        String cacheDir = rs.getApplicationContext().getCacheDir().toString();
 
         Log.v(TAG, "Create script for resource = " + resName);
-        return rs.nScriptCCreate(resName, cacheDir, pgm, pgmLength);
+        return rs.nScriptCCreate(resName, rs.mCachePath, pgm, pgmLength);
     }
 }