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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.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.ExifInterface;
import com.android.messaging.datamodel.media.PoolableImageCache.ReusableImageResourcePool;
import com.android.messaging.util.ImageUtils;
import com.android.messaging.util.LogUtil;
import java.io.IOException;
/**
* Serves file system based image requests. Since file paths can be expressed in Uri form, this
* extends regular UriImageRequest but performs additional optimizations such as loading thumbnails
* directly from Exif information.
*/
public class FileImageRequest extends UriImageRequest {
private final String mPath;
private final boolean mCanUseThumbnail;
public FileImageRequest(final Context context,
final FileImageRequestDescriptor descriptor) {
super(context, descriptor);
mPath = descriptor.path;
mCanUseThumbnail = descriptor.canUseThumbnail;
}
@Override
protected Bitmap loadBitmapInternal()
throws IOException {
// Before using the FileInputStream, check if the Exif has a thumbnail that we can use.
if (mCanUseThumbnail) {
byte[] thumbnail = null;
try {
final ExifInterface exif = new ExifInterface(mPath);
if (exif.hasThumbnail()) {
thumbnail = exif.getThumbnail();
}
} catch (final IOException e) {
// Nothing to do
}
if (thumbnail != null) {
final BitmapFactory.Options options = PoolableImageCache.getBitmapOptionsForPool(
false /* scaled */, 0 /* inputDensity */, 0 /* targetDensity */);
// First, check dimensions of the bitmap.
options.inJustDecodeBounds = true;
BitmapFactory.decodeByteArray(thumbnail, 0, thumbnail.length, options);
// Calculate inSampleSize
options.inSampleSize = ImageUtils.get().calculateInSampleSize(options,
mDescriptor.desiredWidth, mDescriptor.desiredHeight);
options.inJustDecodeBounds = false;
// Actually decode the bitmap, optionally using the bitmap pool.
try {
// Get the orientation. We should be able to get the orientation from
// the thumbnail itself but at least on some phones, the thumbnail
// doesn't have an orientation tag. So use the outer image's orientation
// tag and hope for the best.
mOrientation = ImageUtils.getOrientation(getInputStreamForResource());
if (com.android.messaging.util.exif.ExifInterface.
getOrientationParams(mOrientation).invertDimensions) {
mDescriptor.updateSourceDimensions(options.outHeight, options.outWidth);
} else {
mDescriptor.updateSourceDimensions(options.outWidth, options.outHeight);
}
final ReusableImageResourcePool bitmapPool = getBitmapPool();
if (bitmapPool == null) {
return BitmapFactory.decodeByteArray(thumbnail, 0, thumbnail.length,
options);
} else {
final int sampledWidth = options.outWidth / options.inSampleSize;
final int sampledHeight = options.outHeight / options.inSampleSize;
return bitmapPool.decodeByteArray(thumbnail, options, sampledWidth,
sampledHeight);
}
} catch (IOException ex) {
// If the thumbnail is broken due to IOException, this will
// fall back to default bitmap loading.
LogUtil.e(LogUtil.BUGLE_IMAGE_TAG, "FileImageRequest: failed to load " +
"thumbnail from Exif", ex);
}
}
}
// Fall back to default InputStream-based loading if no thumbnails could be retrieved.
return super.loadBitmapInternal();
}
}
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