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/*
* Copyright (C) 2011 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.gallery3d.data;
import android.graphics.Bitmap;
import com.android.gallery3d.common.Utils;
import java.util.ArrayList;
public class BitmapPool {
@SuppressWarnings("unused")
private static final String TAG = "BitmapPool";
private final ArrayList<Bitmap> mPool;
private final int mPoolLimit;
// mOneSize is true if the pool can only cache Bitmap with one size.
private final boolean mOneSize;
private final int mWidth, mHeight; // only used if mOneSize is true
// Construct a BitmapPool which caches bitmap with the specified size.
public BitmapPool(int width, int height, int poolLimit) {
mWidth = width;
mHeight = height;
mPoolLimit = poolLimit;
mPool = new ArrayList<Bitmap>(poolLimit);
mOneSize = true;
}
// Construct a BitmapPool which caches bitmap with any size;
public BitmapPool(int poolLimit) {
mWidth = -1;
mHeight = -1;
mPoolLimit = poolLimit;
mPool = new ArrayList<Bitmap>(poolLimit);
mOneSize = false;
}
// Get a Bitmap from the pool.
public synchronized Bitmap getBitmap() {
Utils.assertTrue(mOneSize);
int size = mPool.size();
return size > 0 ? mPool.remove(size - 1) : null;
}
// Get a Bitmap from the pool with the specified size.
public synchronized Bitmap getBitmap(int width, int height) {
Utils.assertTrue(!mOneSize);
for (int i = mPool.size() - 1; i >= 0; i--) {
Bitmap b = mPool.get(i);
if (b.getWidth() == width && b.getHeight() == height) {
return mPool.remove(i);
}
}
return null;
}
// Put a Bitmap into the pool, if the Bitmap has a proper size. Otherwise
// the Bitmap will be recycled. If the pool is full, an old Bitmap will be
// recycled.
public void recycle(Bitmap bitmap) {
if (bitmap == null) return;
if (mOneSize && ((bitmap.getWidth() != mWidth) ||
(bitmap.getHeight() != mHeight))) {
bitmap.recycle();
return;
}
synchronized (this) {
if (mPool.size() >= mPoolLimit) mPool.remove(0);
mPool.add(bitmap);
}
}
public synchronized void clear() {
mPool.clear();
}
public boolean isOneSize() {
return mOneSize;
}
}
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