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/*
* Copyright (C) 2017 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.wallpaper.asset;
import android.app.Activity;
import android.app.WallpaperManager;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
/**
* Asset implementation which represents the currently-set wallpaper on API 16 through 23 devices.
*/
public class CurrentWallpaperAssetV16 extends Asset {
private static final boolean FILTER_SCALED_BITMAP = true;
private Context mApplicationContext;
private Drawable mCurrentWallpaperDrawable;
public CurrentWallpaperAssetV16(Context context) {
mApplicationContext = context.getApplicationContext();
}
@Override
public void decodeBitmapRegion(Rect rect, int targetWidth, int targetHeight,
boolean shouldAdjustForRtl, BitmapReceiver receiver) {
receiver.onBitmapDecoded(null);
}
@Override
public void decodeBitmap(int targetWidth, int targetHeight,
BitmapReceiver receiver) {
DecodeBitmapAsyncTask task = new DecodeBitmapAsyncTask(receiver, targetWidth, targetHeight);
task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
@Override
public boolean supportsTiling() {
return false;
}
@Override
public void decodeRawDimensions(Activity unused, DimensionsReceiver receiver) {
DecodeDimensionsAsyncTask task = new DecodeDimensionsAsyncTask(receiver);
task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
private synchronized Drawable getCurrentWallpaperDrawable() {
if (mCurrentWallpaperDrawable != null) {
return mCurrentWallpaperDrawable;
}
WallpaperManager wallpaperManager = WallpaperManager.getInstance(mApplicationContext);
try {
mCurrentWallpaperDrawable = wallpaperManager.getDrawable();
} catch (java.lang.SecurityException e) {
// Work around Samsung bug where SecurityException is thrown if device is still using
// its default wallpaper.
mCurrentWallpaperDrawable = wallpaperManager.getBuiltInDrawable();
}
return mCurrentWallpaperDrawable;
}
/**
* Decodes and then post-decode scales down the currently-set wallpaper bitmap.
*/
private class DecodeBitmapAsyncTask extends AsyncTask<Void, Void, Bitmap> {
private BitmapReceiver mReceiver;
private int mTargetWidth;
private int mTargetHeight;
public DecodeBitmapAsyncTask(BitmapReceiver receiver, int width, int height) {
mReceiver = receiver;
mTargetWidth = width;
mTargetHeight = height;
}
@Override
protected Bitmap doInBackground(Void... unused) {
Drawable wallpaperDrawable = getCurrentWallpaperDrawable();
Bitmap bitmap = ((BitmapDrawable) wallpaperDrawable).getBitmap();
// The final bitmap may be constrained by only one of height and width, so find the maximum
// downscaling factor without having the final result bitmap's height or width dip below the
// provided target height or width.
float maxDownscaleFactor = Math.min((float) bitmap.getWidth() / mTargetWidth,
(float) bitmap.getHeight() / mTargetHeight);
// Scale down full bitmap to save memory consumption post-decoding, while maintaining the
// source bitmap's aspect ratio.
int resultWidth = Math.round(bitmap.getWidth() / maxDownscaleFactor);
int resultHeight = Math.round(bitmap.getHeight() / maxDownscaleFactor);
return Bitmap.createScaledBitmap(bitmap, resultWidth, resultHeight, FILTER_SCALED_BITMAP);
}
@Override
protected void onPostExecute(Bitmap bitmap) {
mReceiver.onBitmapDecoded(bitmap);
}
}
/**
* Decodes the raw dimensions of the currently-set wallpaper.
*/
private class DecodeDimensionsAsyncTask extends AsyncTask<Void, Void, Point> {
private DimensionsReceiver mReceiver;
public DecodeDimensionsAsyncTask(DimensionsReceiver receiver) {
mReceiver = receiver;
}
@Override
protected Point doInBackground(Void... unused) {
Drawable wallpaperDrawable = getCurrentWallpaperDrawable();
return new Point(
wallpaperDrawable.getIntrinsicWidth(), wallpaperDrawable.getIntrinsicHeight());
}
@Override
protected void onPostExecute(Point dimensions) {
mReceiver.onDimensionsDecoded(dimensions);
}
}
}
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