Add Wallpaper scale methods to be used by WallpaperPicker

/*

 * Copyright (C) 2020 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.systemui.shared.system;

import android.graphics.Rect;

import android.os.RemoteException;

import android.service.wallpaper.IWallpaperEngine;

import android.util.Log;

/**

 * @see IWallpaperEngine

 */

public class WallpaperEngineCompat {

    private static final String TAG = "WallpaperEngineCompat";

    private final IWallpaperEngine mWrappedEngine;

    public WallpaperEngineCompat(IWallpaperEngine wrappedEngine) {

        mWrappedEngine = wrappedEngine;

    }

    /**

     * @see IWallpaperEngine#scalePreview(Rect)

     */

    public void scalePreview(Rect scaleToRect) {

        try {

            mWrappedEngine.scalePreview(scaleToRect);

        } catch (RemoteException e) {

            Log.i(TAG, "Couldn't call scalePreview method on WallpaperEngine", e);

        }

    }

}

    public void setWallpaperZoomOut(IBinder windowToken, float zoom) {

        mWallpaperManager.setWallpaperZoomOut(windowToken, zoom);

    }

    /**

     * @return the max scale for the wallpaper when it's fully zoomed out

     */

    public static float getWallpaperZoomOutMaxScale(Context context) {

        return context.getResources()

                .getFloat(com.android.internal.R.dimen.config_wallpaperMaxScale);

    }

}

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