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/*
* Copyright 2018 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.pump.util;
import android.content.ContentResolver;
import android.content.UriMatcher;
import android.content.res.AssetFileDescriptor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.provider.MediaStore;
import androidx.annotation.AnyThread;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.collection.ArrayMap;
import androidx.collection.ArraySet;
import com.android.pump.concurrent.Executors;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.AbstractMap.SimpleEntry;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Executor;
@AnyThread
public class ImageLoader {
private static final String TAG = Clog.tag(ImageLoader.class);
// TODO Replace with Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q throughout the code.
private static boolean isAtLeastRunningQ() {
return Build.VERSION.SDK_INT > Build.VERSION_CODES.P
|| (Build.VERSION.SDK_INT == Build.VERSION_CODES.P
&& Build.VERSION.PREVIEW_SDK_INT > 0);
}
private static final UriMatcher VIDEO_THUMBNAIL_URI_MATCHER =
new UriMatcher(UriMatcher.NO_MATCH);
static {
VIDEO_THUMBNAIL_URI_MATCHER.addURI("media", "*/video/media/#/thumbnail", 0);
}
private final BitmapCache mBitmapCache = new BitmapCache();
private final OrientationCache mOrientationCache = new OrientationCache();
private final ContentResolver mContentResolver;
private final Executor mExecutor;
private final Set<Map.Entry<Executor, Callback>> mCallbacks = new ArraySet<>();
private final Map<Uri, List<Map.Entry<Executor, Callback>>> mLoadCallbacks = new ArrayMap<>();
@FunctionalInterface
public interface Callback {
void onImageLoaded(@NonNull Uri uri, @Nullable Bitmap bitmap);
}
public ImageLoader(@NonNull ContentResolver contentResolver, @NonNull Executor executor) {
mContentResolver = contentResolver;
mExecutor = executor;
}
public void addCallback(@NonNull Callback callback) {
addCallback(callback, Executors.uiThreadExecutor());
}
public void addCallback(@NonNull Callback callback, @NonNull Executor executor) {
synchronized (this) { // TODO(b/123708613) other lock
if (!mCallbacks.add(new SimpleEntry<>(executor, callback))) {
throw new IllegalArgumentException("Callback " + callback + " already added");
}
}
}
public void removeCallback(@NonNull Callback callback) {
removeCallback(callback, Executors.uiThreadExecutor());
}
public void removeCallback(@NonNull Callback callback, @NonNull Executor executor) {
synchronized (this) { // TODO(b/123708613) other lock
if (!mCallbacks.remove(new SimpleEntry<>(executor, callback))) {
throw new IllegalArgumentException("Callback " + callback + " not found");
}
}
}
public void loadImage(@NonNull Uri uri, @NonNull Callback callback) {
loadImage(uri, callback, Executors.uiThreadExecutor());
}
public void loadImage(@NonNull Uri uri, @NonNull Callback callback,
@NonNull Executor executor) {
Bitmap bitmap;
Runnable loader = null;
synchronized (this) { // TODO(b/123708613) other lock
bitmap = mBitmapCache.get(uri);
if (bitmap == null) {
List<Map.Entry<Executor, Callback>> callbacks = mLoadCallbacks.get(uri);
if (callbacks == null) {
callbacks = new LinkedList<>();
mLoadCallbacks.put(uri, callbacks);
loader = new ImageLoaderTask(uri);
}
callbacks.add(new SimpleEntry<>(executor, callback));
}
}
if (bitmap != null) {
executor.execute(() -> callback.onImageLoaded(uri, bitmap));
} else if (loader != null) {
mExecutor.execute(loader);
}
}
public @Orientation int getOrientation(@NonNull Uri uri) {
return mOrientationCache.get(uri);
}
private class ImageLoaderTask implements Runnable {
private final Uri mUri;
private ImageLoaderTask(@NonNull Uri uri) {
mUri = uri;
}
@Override
public void run() {
try {
Bitmap bitmap;
if (isAtLeastRunningQ() || !isVideoThumbnailUri(mUri)) {
byte[] data;
if (Scheme.isContent(mUri)) {
data = readFromContent(mUri);
} else if (Scheme.isFile(mUri)) {
data = IoUtils.readFromFile(new File(mUri.getPath()));
} else if (Scheme.isHttp(mUri) || Scheme.isHttps(mUri)) {
data = Http.get(mUri.toString());
} else {
throw new IllegalArgumentException(
"Unknown scheme '" + mUri.getScheme() + "'");
}
bitmap = decodeBitmapFromByteArray(data);
} else {
// TODO This will always return a bitmap which is inconsistent with Q.
bitmap = MediaStore.Video.Thumbnails.getThumbnail(mContentResolver,
Long.parseLong(mUri.getPathSegments().get(3)),
MediaStore.Video.Thumbnails.MINI_KIND, null);
}
Set<Map.Entry<Executor, Callback>> callbacks;
List<Map.Entry<Executor, Callback>> loadCallbacks;
synchronized (ImageLoader.this) { // TODO(b/123708613) proper lock
if (bitmap != null) {
mBitmapCache.put(mUri, bitmap);
mOrientationCache.put(mUri, bitmap);
}
callbacks = new ArraySet<>(mCallbacks);
loadCallbacks = mLoadCallbacks.remove(mUri);
}
for (Map.Entry<Executor, Callback> callback : callbacks) {
callback.getKey().execute(() ->
callback.getValue().onImageLoaded(mUri, bitmap));
}
for (Map.Entry<Executor, Callback> callback : loadCallbacks) {
callback.getKey().execute(() ->
callback.getValue().onImageLoaded(mUri, bitmap));
}
} catch (IOException | OutOfMemoryError e) {
Clog.e(TAG, "Failed to load image " + mUri, e);
// TODO(b/123708676) remove from mLoadCallbacks
}
}
private @Nullable Bitmap decodeBitmapFromByteArray(@NonNull byte[] data) {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeByteArray(data, 0, data.length, options);
options.inJustDecodeBounds = false;
options.inSampleSize = 1; // TODO(b/123708796) add scaling
return BitmapFactory.decodeByteArray(data, 0, data.length, options);
}
private @NonNull byte[] readFromContent(@NonNull Uri uri) throws IOException {
// TODO(b/123708796) set EXTRA_SIZE in opts
AssetFileDescriptor assetFileDescriptor =
mContentResolver.openTypedAssetFileDescriptor(uri, "image/*", null);
if (assetFileDescriptor == null) {
throw new FileNotFoundException(uri.toString());
}
try {
return IoUtils.readFromAssetFileDescriptor(assetFileDescriptor);
} finally {
IoUtils.close(assetFileDescriptor);
}
}
private boolean isVideoThumbnailUri(@NonNull Uri uri) {
return VIDEO_THUMBNAIL_URI_MATCHER.match(uri) != UriMatcher.NO_MATCH;
}
}
}
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