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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 android.graphics;
import com.android.internal.annotations.GuardedBy;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.os.Parcel;
import android.os.Process;
import android.util.ArrayMap;
import java.util.ArrayList;
/**
* This class is used for Parceling Typeface object.
* Note: Typeface object can not be passed over the process boundary.
*
* @hide
*/
public class LeakyTypefaceStorage {
private static final Object sLock = new Object();
@GuardedBy("sLock")
private static final ArrayList<Typeface> sStorage = new ArrayList<>();
@GuardedBy("sLock")
private static final ArrayMap<Typeface, Integer> sTypefaceMap = new ArrayMap<>();
/**
* Write typeface to parcel.
*
* You can't transfer Typeface to a different process. {@link readTypefaceFromParcel} will
* return {@code null} if the {@link readTypefaceFromParcel} is called in a different process.
*
* @param typeface A {@link Typeface} to be written.
* @param parcel A {@link Parcel} object.
*/
public static void writeTypefaceToParcel(@Nullable Typeface typeface, @NonNull Parcel parcel) {
parcel.writeInt(Process.myPid());
synchronized (sLock) {
final int id;
final Integer i = sTypefaceMap.get(typeface);
if (i != null) {
id = i.intValue();
} else {
id = sStorage.size();
sStorage.add(typeface);
sTypefaceMap.put(typeface, id);
}
parcel.writeInt(id);
}
}
/**
* Read typeface from parcel.
*
* If the {@link Typeface} was created in another process, this method returns null.
*
* @param parcel A {@link Parcel} object
* @return A {@link Typeface} object.
*/
public static @Nullable Typeface readTypefaceFromParcel(@NonNull Parcel parcel) {
final int pid = parcel.readInt();
final int typefaceId = parcel.readInt();
if (pid != Process.myPid()) {
return null; // The Typeface was created and written in another process.
}
synchronized (sLock) {
return sStorage.get(typefaceId);
}
}
}
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