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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.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);
}
}
}
}
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