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/*
* Copyright (C) 2013 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.filtershow.cache;
import android.graphics.Bitmap;
import com.android.gallery3d.app.Log;
public class TripleBufferBitmap {
private static String LOGTAG = "TripleBufferBitmap";
private Bitmap mBitmaps[] = new Bitmap[3];
private Bitmap mProducer = null;
private Bitmap mConsumer = null;
private Bitmap mIntermediate = null;
private boolean mNeedsSwap = false;
private final Bitmap.Config mBitmapConfig = Bitmap.Config.ARGB_8888;
private boolean mNeedsRepaint = true;
public TripleBufferBitmap() {
}
public synchronized void updateBitmaps(Bitmap bitmap) {
mBitmaps[0] = bitmap.copy(mBitmapConfig, true);
mBitmaps[1] = bitmap.copy(mBitmapConfig, true);
mBitmaps[2] = bitmap.copy(mBitmapConfig, true);
mProducer = mBitmaps[0];
mConsumer = mBitmaps[1];
mIntermediate = mBitmaps[2];
}
public synchronized Bitmap getProducer() {
return mProducer;
}
public synchronized Bitmap getConsumer() {
return mConsumer;
}
public synchronized void swapProducer() {
Bitmap intermediate = mIntermediate;
mIntermediate = mProducer;
mProducer = intermediate;
mNeedsSwap = true;
}
public synchronized void swapConsumer() {
if (!mNeedsSwap) {
return;
}
Bitmap intermediate = mIntermediate;
mIntermediate = mConsumer;
mConsumer = intermediate;
mNeedsSwap = false;
}
public synchronized void invalidate() {
mNeedsRepaint = true;
}
public synchronized boolean checkRepaintNeeded() {
if (mNeedsRepaint) {
mNeedsRepaint = false;
return true;
}
return false;
}
}
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