// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
library fuchsia.ui.scenic.internal;

using fuchsia.mem;

// A snapshot result contains a buffer containing the snapshotted
// data as well as a boolean to check whether the snapshot of that
// compositor was successful or not.
type SnapshotResult = resource struct {
    success bool;
    buffer fuchsia.mem.Buffer;
};

/// Defines an internal interface to take snapshots of the entire scene graph. This
/// is only to be used by trusted clients.
@discoverable
protocol Snapshot {
    /// Takes a snapshot of the entire scene-graph, starting with the first
    /// compositor found. A separate buffer is returned for each compositor,
    /// with an empty array being returned if no compositors were found at all.
    TakeSnapshot() -> (resource struct {
        snapshots vector<SnapshotResult>;
    });
};