// Copyright 2018 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.skia.skottie;

using fuchsia.mem;

// Provides load status and animation duration on successful load.
struct Status {
    bool error;
    string? message;
    uint32 duration;
};

// Defines additional options used during |Load|.
struct Options {
    uint32 background_color;
    bool loop;
    bool autoplay;
};

// Defines the player interface to control the animation. It is returned upon
// successful load of the animation.
interface Player {
    // Seek to position |t| where 0 <= t <= 1.
    Seek(float32 t);
    // Play and stop at |t| = 1 if |loop| = false.
    Play();
    // Pause player.
    Pause();
};

[Discoverable]
// Skottie loader exported by |ViewProvider| to load skottie JSON animations
// into views created from it.
interface Loader {
    // Load the snapshot from the Vmo buffer payload. Returns a callback with
    // |Player| controller and load status |Status|. |player| is null if loading
    // failed.
    Load(fuchsia.mem.Buffer payload, Options options) -> (Status status, Player? player);
};