// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

module ash.mojom;

import "mojo/common/time.mojom";
import "skia/public/interfaces/bitmap.mojom";

// These values match wallpaper::WallpaperLayout.
enum WallpaperLayout {
  CENTER,
  CENTER_CROPPED,
  STRETCH,
  TILE,
};

// These values match wallpaper::WallpaperType.
enum WallpaperType {
  DAILY,
  CUSTOMIZED,
  DEFAULT,
  ONLINE,
  POLICY,
  THIRDPARTY,
  DEVICE,
};

// This corresponds to wallpaper::WallpaperInfo.
struct WallpaperInfo {
  string location;
  WallpaperLayout layout;
  WallpaperType type;
  mojo.common.mojom.Time date;
};

// Used by Chrome to set the wallpaper displayed by ash.
interface WallpaperController {
  // Calling this method triggers an initial notification of the wallpaper
  // state. Observers are automatically removed as their connections are closed.
  AddObserver(associated WallpaperObserver observer);

  // Set the wallpaper picker interface, to let ash trigger Chrome's picker.
  SetWallpaperPicker(WallpaperPicker picker);

  // Set the wallpaper bitmap and info used for the ash desktop background.
  // A null or empty |wallpaper| bitmap is treated as a no-op.
  // TODO(crbug.com/655875): Optimize ash wallpaper transport; avoid sending
  // large bitmaps over Mojo; use shared memory like BitmapUploader, etc.
  SetWallpaper(skia.mojom.Bitmap? wallpaper, WallpaperInfo info);

  // Runs to get wallpaper prominent colors.
  GetWallpaperColors() => (array<uint32> prominent_colors);
};

// Used to listen for wallpaper state changed.
interface WallpaperObserver {
  // Called when the colors extracted from the current wallpaper change. May
  // be called as a side effect of changing the wallpaper on the
  // WallpaperController, e.g. WallpaperController::SetWallpaperImage().
  // Colors are ordered and are referenced in wallpaper::ColorProfileType.
  OnWallpaperColorsChanged(array<uint32> prominent_colors);
};

// Used by ash to trigger Chrome's wallpaper picker functionality.
interface WallpaperPicker {
  // Open the wallpaper picker window.
  Open();
};