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/*
* Copyright (C) 2012 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.dreams.phototable;
import android.content.ContentResolver;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Resources;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.net.Uri;
import android.provider.MediaStore;
import android.util.Log;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.IOException;
import java.io.BufferedInputStream;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedList;
import java.util.Random;
/**
* Picks a random image from a source of photos.
*/
public abstract class PhotoSource {
private static final String TAG = "PhotoTable.PhotoSource";
private static final boolean DEBUG = true;
// This should be large enough for BitmapFactory to decode the header so
// that we can mark and reset the input stream to avoid duplicate network i/o
private static final int BUFFER_SIZE = 128 * 1024;
public class ImageData {
public String id;
public String url;
public int orientation;
InputStream getStream() {
return PhotoSource.this.getStream(this);
}
}
public class AlbumData {
public String id;
public String title;
public String thumbnailUrl;
public String account;
public long updated;
public String getType() {
String type = PhotoSource.this.getClass().getName();
log(TAG, "type is " + type);
return type;
}
}
private final LinkedList<ImageData> mImageQueue;
private final int mMaxQueueSize;
private final float mMaxCropRatio;
private final PhotoSource mFallbackSource;
protected final Context mContext;
protected final Resources mResources;
protected final Random mRNG;
protected final SharedPreferences mSettings;
protected final ContentResolver mResolver;
protected String mSourceName;
public PhotoSource(Context context, SharedPreferences settings) {
this(context, settings, new StockSource(context, settings));
}
public PhotoSource(Context context, SharedPreferences settings, PhotoSource fallbackSource) {
mSourceName = TAG;
mContext = context;
mSettings = settings;
mResolver = mContext.getContentResolver();
mResources = context.getResources();
mImageQueue = new LinkedList<ImageData>();
mMaxQueueSize = mResources.getInteger(R.integer.image_queue_size);
mMaxCropRatio = mResources.getInteger(R.integer.max_crop_ratio) / 1000000f;
mRNG = new Random();
mFallbackSource = fallbackSource;
}
protected void fillQueue() {
log(TAG, "filling queue");
mImageQueue.addAll(findImages(mMaxQueueSize - mImageQueue.size()));
Collections.shuffle(mImageQueue);
log(TAG, "queue contains: " + mImageQueue.size() + " items.");
}
public Bitmap next(BitmapFactory.Options options, int longSide, int shortSide) {
log(TAG, "decoding a picasa resource to " + longSide + ", " + shortSide);
Bitmap image = null;
if (mImageQueue.isEmpty()) {
fillQueue();
}
if (!mImageQueue.isEmpty()) {
image = load(mImageQueue.poll(), options, longSide, shortSide);
}
if (image == null && mFallbackSource != null) {
image = load((ImageData) mFallbackSource.findImages(1).toArray()[0],
options, longSide, shortSide);
}
return image;
}
public Bitmap load(ImageData data, BitmapFactory.Options options, int longSide, int shortSide) {
log(TAG, "decoding photo resource to " + longSide + ", " + shortSide);
InputStream is = data.getStream();
Bitmap image = null;
try {
BufferedInputStream bis = new BufferedInputStream(is);
bis.mark(BUFFER_SIZE);
options.inJustDecodeBounds = true;
options.inSampleSize = 1;
image = BitmapFactory.decodeStream(new BufferedInputStream(bis), null, options);
int rawLongSide = Math.max(options.outWidth, options.outHeight);
int rawShortSide = Math.min(options.outWidth, options.outHeight);
log(TAG, "I see bounds of " + rawLongSide + ", " + rawShortSide);
if (rawLongSide != -1 && rawShortSide != -1) {
float insideRatio = Math.max((float) longSide / (float) rawLongSide,
(float) shortSide / (float) rawShortSide);
float outsideRatio = Math.max((float) longSide / (float) rawLongSide,
(float) shortSide / (float) rawShortSide);
float ratio = (outsideRatio / insideRatio < mMaxCropRatio ?
outsideRatio : insideRatio);
while (ratio < 0.5) {
options.inSampleSize *= 2;
ratio *= 2;
}
log(TAG, "decoding with inSampleSize " + options.inSampleSize);
bis.reset();
options.inJustDecodeBounds = false;
image = BitmapFactory.decodeStream(bis, null, options);
rawLongSide = Math.max(options.outWidth, options.outHeight);
rawShortSide = Math.max(options.outWidth, options.outHeight);
ratio = Math.max((float) longSide / (float) rawLongSide,
(float) shortSide / (float) rawShortSide);
if (Math.abs(ratio - 1.0f) > 0.001) {
log(TAG, "still too big, scaling down by " + ratio);
options.outWidth = (int) (ratio * options.outWidth);
options.outHeight = (int) (ratio * options.outHeight);
image = Bitmap.createScaledBitmap(image,
options.outWidth, options.outHeight,
true);
}
if (data.orientation != 0) {
log(TAG, "rotated by " + data.orientation + ": fixing");
if (data.orientation == 90 || data.orientation == 270) {
int tmp = options.outWidth;
options.outWidth = options.outHeight;
options.outHeight = tmp;
}
Matrix matrix = new Matrix();
matrix.setRotate(data.orientation,
(float) image.getWidth() / 2,
(float) image.getHeight() / 2);
image = Bitmap.createBitmap(image, 0, 0,
options.outHeight, options.outWidth,
matrix, true);
}
log(TAG, "returning bitmap " + image.getWidth() + ", " + image.getHeight());
} else {
log(TAG, "decoding failed with no error: " + options.mCancel);
}
} catch (FileNotFoundException fnf) {
log(TAG, "file not found: " + fnf);
} catch (IOException ioe) {
log(TAG, "i/o exception: " + ioe);
} finally {
try {
if (is != null) {
is.close();
}
} catch (Throwable t) {
log(TAG, "close fail: " + t.toString());
}
}
return image;
}
public void setSeed(long seed) {
mRNG.setSeed(seed);
}
protected static void log(String tag, String message) {
if (DEBUG) {
Log.i(tag, message);
}
}
protected abstract InputStream getStream(ImageData data);
protected abstract Collection<ImageData> findImages(int howMany);
public abstract Collection<AlbumData> findAlbums();
}
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