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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.bitmap;
import android.graphics.Bitmap;
/**
* A simple bitmap wrapper. Currently supports reference counting and logical width/height
* (which may differ from a bitmap's reported width/height due to bitmap reuse).
*/
public class ReusableBitmap implements Poolable {
public final Bitmap bmp;
private int mWidth;
private int mHeight;
private int mOrientation;
private int mRefCount = 0;
private final boolean mReusable;
public ReusableBitmap(final Bitmap bitmap) {
this(bitmap, true /* reusable */);
}
public ReusableBitmap(final Bitmap bitmap, final boolean reusable) {
bmp = bitmap;
mReusable = reusable;
}
@Override
public boolean isEligibleForPooling() {
return mReusable;
}
public void setLogicalWidth(int w) {
mWidth = w;
}
public void setLogicalHeight(int h) {
mHeight = h;
}
public int getLogicalWidth() {
return mWidth;
}
public int getLogicalHeight() {
return mHeight;
}
public int getOrientation() {
return mOrientation;
}
public void setOrientation(final int orientation) {
mOrientation = orientation;
}
public int getByteCount() {
return bmp.getByteCount();
}
@Override
public void acquireReference() {
mRefCount++;
}
@Override
public void releaseReference() {
if (mRefCount == 0) {
throw new IllegalStateException();
}
mRefCount--;
}
@Override
public int getRefCount() {
return mRefCount;
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder("[");
sb.append(super.toString());
sb.append(" refCount=");
sb.append(mRefCount);
sb.append(" mReusable=");
sb.append(mReusable);
sb.append(" bmp=");
sb.append(bmp);
sb.append(" logicalW/H=");
sb.append(mWidth);
sb.append("/");
sb.append(mHeight);
if (bmp != null) {
sb.append(" sz=");
sb.append(bmp.getByteCount() >> 10);
sb.append("KB");
}
sb.append("]");
return sb.toString();
}
/**
* Singleton class to represent a null Bitmap. We don't want to just use a regular
* ReusableBitmap with a null bmp field because that will render that ReusableBitmap useless
* and unable to be used by another decode process.
*/
public final static class NullReusableBitmap extends ReusableBitmap {
private static NullReusableBitmap sInstance;
/**
* Get a singleton.
*/
public static NullReusableBitmap getInstance() {
if (sInstance == null) {
sInstance = new NullReusableBitmap();
}
return sInstance;
}
private NullReusableBitmap() {
super(null /* bmp */, false /* reusable */);
}
@Override
public int getByteCount() {
return 0;
}
@Override
public void releaseReference() { }
@Override
public void acquireReference() { }
}
}
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