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/*
* Copyright (C) 2012 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.view;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.Pools.SynchronizedPool;
/**
* This class represents spec for performing screen magnification.
*
* @hide
*/
public class MagnificationSpec implements Parcelable {
private static final int MAX_POOL_SIZE = 20;
private static final SynchronizedPool<MagnificationSpec> sPool =
new SynchronizedPool<MagnificationSpec>(MAX_POOL_SIZE);
public float scale = 1.0f;
public float offsetX;
public float offsetY;
private MagnificationSpec() {
/* do nothing - reducing visibility */
}
public void initialize(float scale, float offsetX, float offsetY) {
if (scale < 1) {
throw new IllegalArgumentException("Scale must be greater than or equal to one!");
}
this.scale = scale;
this.offsetX = offsetX;
this.offsetY = offsetY;
}
public boolean isNop() {
return scale == 1.0f && offsetX == 0 && offsetY == 0;
}
public static MagnificationSpec obtain(MagnificationSpec other) {
MagnificationSpec info = obtain();
info.scale = other.scale;
info.offsetX = other.offsetX;
info.offsetY = other.offsetY;
return info;
}
public static MagnificationSpec obtain() {
MagnificationSpec spec = sPool.acquire();
return (spec != null) ? spec : new MagnificationSpec();
}
public void recycle() {
clear();
sPool.release(this);
}
public void clear() {
scale = 1.0f;
offsetX = 0.0f;
offsetY = 0.0f;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel parcel, int flags) {
parcel.writeFloat(scale);
parcel.writeFloat(offsetX);
parcel.writeFloat(offsetY);
recycle();
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("<scale:");
builder.append(scale);
builder.append(",offsetX:");
builder.append(offsetX);
builder.append(",offsetY:");
builder.append(offsetY);
builder.append(">");
return builder.toString();
}
private void initFromParcel(Parcel parcel) {
scale = parcel.readFloat();
offsetX = parcel.readFloat();
offsetY = parcel.readFloat();
}
public static final Creator<MagnificationSpec> CREATOR = new Creator<MagnificationSpec>() {
@Override
public MagnificationSpec[] newArray(int size) {
return new MagnificationSpec[size];
}
@Override
public MagnificationSpec createFromParcel(Parcel parcel) {
MagnificationSpec spec = MagnificationSpec.obtain();
spec.initFromParcel(parcel);
return spec;
}
};
}
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