Rewrite: Widget preview loader logic

> Widget previews are saved in data dir instead of cache dir
> Expiring widget previews similar to IconCache
> Removed support for setting thread priorities

Bug: 19865031
Change-Id: Ib6033c2b1ff8ae61bba8762ca994ccd8217d3c75
diff --git a/src/com/android/launcher3/ItemInfo.java b/src/com/android/launcher3/ItemInfo.java
index aff8323..f114de2 100644
--- a/src/com/android/launcher3/ItemInfo.java
+++ b/src/com/android/launcher3/ItemInfo.java
@@ -20,13 +20,10 @@
 import android.content.Context;
 import android.content.Intent;
 import android.graphics.Bitmap;
-import android.util.Log;
 
 import com.android.launcher3.compat.UserHandleCompat;
 import com.android.launcher3.compat.UserManagerCompat;
 
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
 import java.util.Arrays;
 
 /**
@@ -177,25 +174,9 @@
         }
     }
 
-    static byte[] flattenBitmap(Bitmap bitmap) {
-        // Try go guesstimate how much space the icon will take when serialized
-        // to avoid unnecessary allocations/copies during the write.
-        int size = bitmap.getWidth() * bitmap.getHeight() * 4;
-        ByteArrayOutputStream out = new ByteArrayOutputStream(size);
-        try {
-            bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
-            out.flush();
-            out.close();
-            return out.toByteArray();
-        } catch (IOException e) {
-            Log.w("Favorite", "Could not write icon");
-            return null;
-        }
-    }
-
     static void writeBitmap(ContentValues values, Bitmap bitmap) {
         if (bitmap != null) {
-            byte[] data = flattenBitmap(bitmap);
+            byte[] data = Utilities.flattenBitmap(bitmap);
             values.put(LauncherSettings.Favorites.ICON, data);
         }
     }