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/*
* Copyright (C) 2015 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.messaging.datamodel.media;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;
import com.android.messaging.util.Assert;
import com.android.messaging.util.Assert.DoesNotRunOnMainThread;
import java.util.Arrays;
import java.util.List;
/**
* A cache-facing image resource that's much more compact than the raw Bitmap objects stored in
* {@link com.android.messaging.datamodel.media.DecodedImageResource}.
*
* This resource is created from a regular Bitmap-based ImageResource before being pushed to
* {@link com.android.messaging.datamodel.media.MediaCache}, if the image request
* allows for resource encoding/compression.
*
* During resource retrieval on cache hit,
* {@link #getMediaDecodingRequest(MediaRequest)} is invoked to create a async
* decode task, which decodes the compressed byte array back to a regular image resource to
* be consumed by the UI.
*/
public class EncodedImageResource extends ImageResource {
private final byte[] mImageBytes;
public EncodedImageResource(String key, byte[] imageBytes, int orientation) {
super(key, orientation);
mImageBytes = imageBytes;
}
@Override
@DoesNotRunOnMainThread
public Bitmap getBitmap() {
acquireLock();
try {
// This should only be called during the decode request.
Assert.isNotMainThread();
return BitmapFactory.decodeByteArray(mImageBytes, 0, mImageBytes.length);
} finally {
releaseLock();
}
}
@Override
public byte[] getBytes() {
acquireLock();
try {
return Arrays.copyOf(mImageBytes, mImageBytes.length);
} finally {
releaseLock();
}
}
@Override
public Bitmap reuseBitmap() {
return null;
}
@Override
public boolean supportsBitmapReuse() {
return false;
}
@Override
public int getMediaSize() {
return mImageBytes.length;
}
@Override
protected void close() {
}
@Override
public Drawable getDrawable(Resources resources) {
return null;
}
@Override
boolean isEncoded() {
return true;
}
@Override
MediaRequest<? extends RefCountedMediaResource> getMediaDecodingRequest(
final MediaRequest<? extends RefCountedMediaResource> originalRequest) {
Assert.isTrue(isEncoded());
return new DecodeImageRequest();
}
/**
* A MediaRequest that decodes the encoded image resource. This class is chained to the
* original media request that requested the image, so it inherits the listener and
* properties such as binding.
*/
private class DecodeImageRequest implements MediaRequest<ImageResource> {
public DecodeImageRequest() {
// Hold a ref onto the encoded resource before the request finishes.
addRef();
}
@Override
public String getKey() {
return EncodedImageResource.this.getKey();
}
@Override
@DoesNotRunOnMainThread
public ImageResource loadMediaBlocking(List<MediaRequest<ImageResource>> chainedTask)
throws Exception {
Assert.isNotMainThread();
acquireLock();
try {
final Bitmap decodedBitmap = BitmapFactory.decodeByteArray(mImageBytes, 0,
mImageBytes.length);
return new DecodedImageResource(getKey(), decodedBitmap, getOrientation());
} finally {
releaseLock();
release();
}
}
@Override
public MediaCache<ImageResource> getMediaCache() {
// Decoded resource is non-cachable, it's for UI consumption only (for now at least)
return null;
}
@Override
public int getCacheId() {
return 0;
}
@Override
public int getRequestType() {
return REQUEST_DECODE_MEDIA;
}
@Override
public MediaRequestDescriptor<ImageResource> getDescriptor() {
return null;
}
}
}
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