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Commit 10088ca2 authored by Martijn Coenen's avatar Martijn Coenen
Browse files

Support Notification bitmap offloading. 

Introduce a BitmapOffloadService in system_server that can take a Bitmap
and serve it as a Uri through a ContentProvider. This allows the Bitmap
to be written to disk, and to be loaded back into memory when needed.

The ContentProvider will only allow system_server to insert, modify and
delete entries. Users of the offloader must provide a PermissionChecker
interface to determine which callers are allowed to retrieve the
Bitmap associated with each entry.

The offloader does not persist the Bitmaps; they are wiped on every
system_server start. It will also only allow offloading Bitmaps if the
device has enough free storage space.

Modify NotificationManagerService to offload BigPicture Bitmaps, if
the corresponding flag is enabled.

Bug: 398153219
Flag: android.service.notification.notification_bitmap_offloading
Test: atest CtsNotificationTestCases
Change-Id: I531d3e81c8733f913ec7638f3877d11bb1229e88
parent 421044be

core/java/android/service/notification/flags.aconfig

+7 −0
Original line number Diff line number Diff line
@@ -73,3 +73,10 @@ flag { 
  description: "This flag controls regrouping after notification classification"

  bug: "372775153"

}



flag {

  name: "notification_bitmap_offloading"

  namespace: "systemui"

  description: "Enables offloading Bitmaps to disk"

  bug: "398153219"

}

core/res/AndroidManifest.xml

+8 −0
Original line number Diff line number Diff line
@@ -9660,6 +9660,14 @@ 
            android:exported="true">

        </provider>



        <provider

            android:name="com.android.server.bitmapoffload.BitmapOffloadProvider"

            android:authorities="com.android.bitmapoffload"

            android:singleUser="true"

            android:enabled="true"

            android:exported="true">

        </provider>



        <meta-data

            android:name="com.android.server.patch.25239169"

            android:value="true" />

services/core/java/com/android/server/bitmapoffload/BitmapOffload.java

0 → 100644
+31 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2025 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */



package com.android.server.bitmapoffload;



import android.annotation.IntDef;



import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;



public final class BitmapOffload {

    @Retention(RetentionPolicy.SOURCE)

    @IntDef(prefix = "BITMAP_SOURCE_", value = {

        BITMAP_SOURCE_NOTIFICATIONS,

    })

    public @interface BitmapSource {}

    public static final int BITMAP_SOURCE_NOTIFICATIONS = 0;

}

services/core/java/com/android/server/bitmapoffload/BitmapOffloadContract.java

0 → 100644
+49 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2025 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */



package com.android.server.bitmapoffload;



import android.annotation.IntDef;

import android.net.Uri;



import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;



public final class BitmapOffloadContract {

    public static final String AUTHORITY = "com.android.bitmapoffload";



    public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/bitmaps");



    public static final String COLUMN_ID = "_id";

    public static final String COLUMN_SOURCE = "source";

    public static final String COLUMN_FILE_NAME = "filename";

    public static final String COLUMN_FILE_SIZE = "filesize";

    public static final String COLUMN_WIDTH = "width";

    public static final String COLUMN_HEIGHT = "height";

    public static final String COLUMN_OWNER_UID = "owner_uid";

    public static final String COLUMN_STATUS = "status";



    @Retention(RetentionPolicy.SOURCE)

    @IntDef(prefix = "OFFLOAD_STATUS_", value = {

            OFFLOAD_STATUS_PENDING,

            OFFLOAD_STATUS_COMPLETED,

            OFFLOAD_STATUS_FAILED

    })

    public @interface OffloadStatus {}

    public static final int OFFLOAD_STATUS_PENDING = 0;

    public static final int OFFLOAD_STATUS_COMPLETED = 1;

    public static final int OFFLOAD_STATUS_FAILED = 2;

}

services/core/java/com/android/server/bitmapoffload/BitmapOffloadInternal.java

0 → 100644
+32 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2025 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */



package com.android.server.bitmapoffload;



import android.graphics.Bitmap;

import android.net.Uri;



public abstract class BitmapOffloadInternal {

    public interface PermissionHandler {

        boolean isAllowedToOpen(Uri uri, int callingUid, int owningUid);

    }



    public abstract Uri offloadBitmap(@BitmapOffload.BitmapSource int source, Bitmap bitmap);

    public abstract void registerPermissionHandler(@BitmapOffload.BitmapSource int source,

            PermissionHandler handler);

    public abstract boolean checkPermission(@BitmapOffload.BitmapSource int source, Uri uri,

            int callingUid, int owningUid);

}