memory-friendly resize for circle cropping

Fixes #2224
// FREEBIE

src/org/thoughtcrime/securesms/GroupCreateActivity.java

@@ -54,6 +54,7 @@ import org.thoughtcrime.securesms.recipients.RecipientFactory;
 import org.thoughtcrime.securesms.recipients.RecipientFormattingException;
 import org.thoughtcrime.securesms.recipients.Recipients;
 import org.thoughtcrime.securesms.sms.MessageSender;
+import org.thoughtcrime.securesms.util.BitmapDecodingException;
 import org.thoughtcrime.securesms.util.BitmapUtil;
 import org.thoughtcrime.securesms.util.DynamicLanguage;
 import org.thoughtcrime.securesms.util.DynamicTheme;
@@ -511,8 +512,8 @@ public class GroupCreateActivity extends PassphraseRequiredActionBarActivity {
     protected Bitmap doInBackground(Void... voids) {
       if (avatarUri != null) {
         try {
-          avatarBmp = BitmapUtil.getScaledCircleCroppedBitmap(getApplicationContext(), avatarUri, AVATAR_SIZE);
-        } catch (FileNotFoundException e) {
+          avatarBmp = BitmapUtil.getScaledCircleCroppedBitmap(GroupCreateActivity.this, masterSecret, avatarUri, AVATAR_SIZE);
+        } catch (FileNotFoundException | BitmapDecodingException e) {
           Log.w(TAG, e);
           return null;
         }

src/org/thoughtcrime/securesms/util/BitmapUtil.java

@@ -202,10 +202,11 @@ public class BitmapUtil {
     return getScaledCircleCroppedBitmap(bitmap, srcSize);
   }
 
-  public static Bitmap getScaledCircleCroppedBitmap(Context context, Uri uri, int destSize) throws FileNotFoundException {
-    InputStream dataStream        = context.getContentResolver().openInputStream(uri);
-    InputStream orientationStream = context.getContentResolver().openInputStream(uri);
-    Bitmap      bitmap            = BitmapFactory.decodeStream(dataStream);
+  public static Bitmap getScaledCircleCroppedBitmap(Context context, MasterSecret masterSecret, Uri uri, int destSize)
+      throws FileNotFoundException, BitmapDecodingException
+  {
+    InputStream orientationStream = PartAuthority.getPartStream(context, masterSecret, uri);
+    Bitmap      bitmap            = createScaledBitmap(context, masterSecret, uri, destSize, destSize);
 
     return getScaledCircleCroppedBitmap(fixOrientation(bitmap, orientationStream), destSize);
   }