| /* |
| * 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.module; |
| |
| import android.graphics.Bitmap; |
| import android.graphics.Rect; |
| import android.os.AsyncTask; |
| import android.util.Log; |
| |
| import com.android.wallpaper.asset.Asset; |
| import com.android.wallpaper.asset.Asset.BitmapReceiver; |
| |
| /** |
| * Default implementation of BitmapCropper, which actually crops and scales bitmaps. |
| */ |
| public class DefaultBitmapCropper implements BitmapCropper { |
| private static final String TAG = "DefaultBitmapCropper"; |
| private static final boolean FILTER_SCALED_BITMAP = true; |
| |
| @Override |
| public void cropAndScaleBitmap(Asset asset, float scale, final Rect cropRect, |
| final Callback callback) { |
| // Crop rect in pixels of source image. |
| Rect scaledCropRect = new Rect( |
| Math.round((float) cropRect.left / scale), |
| Math.round((float) cropRect.top / scale), |
| Math.round((float) cropRect.right / scale), |
| Math.round((float) cropRect.bottom / scale)); |
| |
| asset.decodeBitmapRegion(scaledCropRect, cropRect.width(), cropRect.height(), |
| new BitmapReceiver() { |
| @Override |
| public void onBitmapDecoded(Bitmap bitmap) { |
| |
| // Asset provides a bitmap which is appropriate for the target width & height, but since |
| // it does not guarantee an exact size we need to fit the bitmap to the cropRect. |
| ScaleBitmapTask task = new ScaleBitmapTask(bitmap, cropRect, callback); |
| task.execute(); |
| } |
| }); |
| } |
| |
| /** |
| * AsyncTask subclass which creates a new bitmap which is resized to the exact dimensions of a |
| * Rect using Bitmap#createScaledBitmap. |
| */ |
| private static class ScaleBitmapTask extends AsyncTask<Void, Void, Boolean> { |
| |
| private final Rect mCropRect; |
| private final Callback mCallback; |
| private Throwable mThrowable; |
| |
| private Bitmap mBitmap; |
| |
| public ScaleBitmapTask(Bitmap bitmap, Rect cropRect, Callback callback) { |
| super(); |
| mBitmap = bitmap; |
| mCropRect = cropRect; |
| mCallback = callback; |
| } |
| |
| @Override |
| protected Boolean doInBackground(Void... unused) { |
| if (mBitmap == null) { |
| return false; |
| } |
| |
| try { |
| // Fit bitmap to exact dimensions of crop rect. |
| mBitmap = Bitmap.createScaledBitmap( |
| mBitmap, |
| mCropRect.width(), |
| mCropRect.height(), |
| FILTER_SCALED_BITMAP); |
| |
| return true; |
| } catch (OutOfMemoryError e) { |
| Log.w(TAG, "Not enough memory to fit the final cropped and scaled bitmap to size", e); |
| mThrowable = e; |
| return false; |
| } |
| } |
| |
| @Override |
| protected void onPostExecute(Boolean isSuccess) { |
| if (isSuccess) { |
| mCallback.onBitmapCropped(mBitmap); |
| } else { |
| mCallback.onError(mThrowable); |
| } |
| } |
| } |
| } |