src/com/android/camera/Thumbnail.java - platform/packages/apps/Camera - Git at Google

 /*
  * Copyright (C) 2011 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.camera;

 import android.content.ContentResolver;
 import android.content.ContentUris;
 import android.database.Cursor;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.graphics.Matrix;
 import android.media.MediaMetadataRetriever;
 import android.net.Uri;
 import android.provider.MediaStore.Images;
 import android.provider.MediaStore.Images.ImageColumns;
 import android.provider.MediaStore.MediaColumns;
 import android.provider.MediaStore.Video;
 import android.provider.MediaStore.Video.VideoColumns;
 import android.util.Log;

 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.File;
 import java.io.FileDescriptor;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;

 public class Thumbnail {
     private static final String TAG = "Thumbnail";

     public static final String LAST_THUMB_FILENAME = "last_thumb";
     private static final int BUFSIZE = 4096;

     private Uri mUri;
     private Bitmap mBitmap;
     // whether this thumbnail is read from file
     private boolean mFromFile = false;

     // Camera, VideoCamera, and Panorama share the same thumbnail. Use sLock
     // to serialize the access.
     private static Object sLock = new Object();

     public Thumbnail(Uri uri, Bitmap bitmap, int orientation) {
         mUri = uri;
         mBitmap = rotateImage(bitmap, orientation);
         if (mBitmap == null) throw new IllegalArgumentException("null bitmap");
     }

     public Uri getUri() {
         return mUri;
     }

     public Bitmap getBitmap() {
         return mBitmap;
     }

     public void setFromFile(boolean fromFile) {
         mFromFile = fromFile;
     }

     public boolean fromFile() {
         return mFromFile;
     }

     private static Bitmap rotateImage(Bitmap bitmap, int orientation) {
         if (orientation != 0) {
             // We only rotate the thumbnail once even if we get OOM.
             Matrix m = new Matrix();
             m.setRotate(orientation, bitmap.getWidth() * 0.5f,
                     bitmap.getHeight() * 0.5f);

             try {
                 Bitmap rotated = Bitmap.createBitmap(bitmap, 0, 0,
                         bitmap.getWidth(), bitmap.getHeight(), m, true);
                 // If the rotated bitmap is the original bitmap, then it
                 // should not be recycled.
                 if (rotated != bitmap) bitmap.recycle();
                 return rotated;
             } catch (Throwable t) {
                 Log.w(TAG, "Failed to rotate thumbnail", t);
             }
         }
         return bitmap;
     }

     // Stores the bitmap to the specified file.
     public void saveTo(File file) {
         FileOutputStream f = null;
         BufferedOutputStream b = null;
         DataOutputStream d = null;
         synchronized (sLock) {
             try {
                 f = new FileOutputStream(file);
                 b = new BufferedOutputStream(f, BUFSIZE);
                 d = new DataOutputStream(b);
                 d.writeUTF(mUri.toString());
                 mBitmap.compress(Bitmap.CompressFormat.JPEG, 90, d);
                 d.close();
             } catch (IOException e) {
                 Log.e(TAG, "Fail to store bitmap. path=" + file.getPath(), e);
             } finally {
                 Util.closeSilently(f);
                 Util.closeSilently(b);
                 Util.closeSilently(d);
             }
         }
     }

     // Loads the data from the specified file.
     // Returns null if failure.
     public static Thumbnail loadFrom(File file) {
         Uri uri = null;
         Bitmap bitmap = null;
         FileInputStream f = null;
         BufferedInputStream b = null;
         DataInputStream d = null;
         synchronized (sLock) {
             try {
                 f = new FileInputStream(file);
                 b = new BufferedInputStream(f, BUFSIZE);
                 d = new DataInputStream(b);
                 uri = Uri.parse(d.readUTF());
                 bitmap = BitmapFactory.decodeStream(d);
                 d.close();
             } catch (IOException e) {
                 Log.i(TAG, "Fail to load bitmap. " + e);
                 return null;
             } finally {
                 Util.closeSilently(f);
                 Util.closeSilently(b);
                 Util.closeSilently(d);
             }
         }
         Thumbnail thumbnail = createThumbnail(uri, bitmap, 0);
         if (thumbnail != null) thumbnail.setFromFile(true);
         return thumbnail;
     }

     public static Thumbnail getLastThumbnail(ContentResolver resolver) {
         Media image = getLastImageThumbnail(resolver);
         Media video = getLastVideoThumbnail(resolver);
         if (image == null && video == null) return null;

         Bitmap bitmap = null;
         Media lastMedia;
         // If there is only image or video, get its thumbnail. If both exist,
         // get the thumbnail of the one that is newer.
         if (image != null && (video == null || image.dateTaken >= video.dateTaken)) {
             bitmap = Images.Thumbnails.getThumbnail(resolver, image.id,
                     Images.Thumbnails.MINI_KIND, null);
             lastMedia = image;
         } else {
             bitmap = Video.Thumbnails.getThumbnail(resolver, video.id,
                     Video.Thumbnails.MINI_KIND, null);
             lastMedia = video;
         }

         // Ensure database and storage are in sync.
         if (Util.isUriValid(lastMedia.uri, resolver)) {
             return createThumbnail(lastMedia.uri, bitmap, lastMedia.orientation);
         }
         return null;
     }

     private static class Media {
         public Media(long id, int orientation, long dateTaken, Uri uri) {
             this.id = id;
             this.orientation = orientation;
             this.dateTaken = dateTaken;
             this.uri = uri;
         }

         public final long id;
         public final int orientation;
         public final long dateTaken;
         public final Uri uri;
     }

     public static Media getLastImageThumbnail(ContentResolver resolver) {
         Uri baseUri = Images.Media.EXTERNAL_CONTENT_URI;

         Uri query = baseUri.buildUpon().appendQueryParameter("limit", "1").build();
         String[] projection = new String[] {ImageColumns._ID, ImageColumns.ORIENTATION,
                 ImageColumns.DATE_TAKEN};
         String selection = ImageColumns.MIME_TYPE + "='image/jpeg' AND " +
                 ImageColumns.BUCKET_ID + '=' + Storage.BUCKET_ID;
         String order = ImageColumns.DATE_TAKEN + " DESC," + ImageColumns._ID + " DESC";

         Cursor cursor = null;
         try {
             cursor = resolver.query(query, projection, selection, null, order);
             if (cursor != null && cursor.moveToFirst()) {
                 long id = cursor.getLong(0);
                 return new Media(id, cursor.getInt(1), cursor.getLong(2),
                         ContentUris.withAppendedId(baseUri, id));
             }
         } finally {
             if (cursor != null) {
                 cursor.close();
             }
         }
         return null;
     }

     private static Media getLastVideoThumbnail(ContentResolver resolver) {
         Uri baseUri = Video.Media.EXTERNAL_CONTENT_URI;

         Uri query = baseUri.buildUpon().appendQueryParameter("limit", "1").build();
         String[] projection = new String[] {VideoColumns._ID, MediaColumns.DATA,
                 VideoColumns.DATE_TAKEN};
         String selection = VideoColumns.BUCKET_ID + '=' + Storage.BUCKET_ID;
         String order = VideoColumns.DATE_TAKEN + " DESC," + VideoColumns._ID + " DESC";

         Cursor cursor = null;
         try {
             cursor = resolver.query(query, projection, selection, null, order);
             if (cursor != null && cursor.moveToFirst()) {
                 Log.d(TAG, "getLastVideoThumbnail: " + cursor.getString(1));
                 long id = cursor.getLong(0);
                 return new Media(id, 0, cursor.getLong(2),
                         ContentUris.withAppendedId(baseUri, id));
             }
         } finally {
             if (cursor != null) {
                 cursor.close();
             }
         }
         return null;
     }

     public static Thumbnail createThumbnail(byte[] jpeg, int orientation, int inSampleSize,
             Uri uri) {
         // Create the thumbnail.
         BitmapFactory.Options options = new BitmapFactory.Options();
         options.inSampleSize = inSampleSize;
         Bitmap bitmap = BitmapFactory.decodeByteArray(jpeg, 0, jpeg.length, options);
         return createThumbnail(uri, bitmap, orientation);
     }

     public static Bitmap createVideoThumbnail(FileDescriptor fd, int targetWidth) {
         return createVideoThumbnail(null, fd, targetWidth);
     }

     public static Bitmap createVideoThumbnail(String filePath, int targetWidth) {
         return createVideoThumbnail(filePath, null, targetWidth);
     }

     private static Bitmap createVideoThumbnail(String filePath, FileDescriptor fd, int targetWidth) {
         Bitmap bitmap = null;
         MediaMetadataRetriever retriever = new MediaMetadataRetriever();
         try {
             if (filePath != null) {
                 retriever.setDataSource(filePath);
             } else {
                 retriever.setDataSource(fd);
             }
             bitmap = retriever.getFrameAtTime(-1);
         } catch (IllegalArgumentException ex) {
             // Assume this is a corrupt video file
         } catch (RuntimeException ex) {
             // Assume this is a corrupt video file.
         } finally {
             try {
                 retriever.release();
             } catch (RuntimeException ex) {
                 // Ignore failures while cleaning up.
             }
         }
         if (bitmap == null) return null;

         // Scale down the bitmap if it is bigger than we need.
         int width = bitmap.getWidth();
         int height = bitmap.getHeight();
         if (width > targetWidth) {
             float scale = (float) targetWidth / width;
             int w = Math.round(scale * width);
             int h = Math.round(scale * height);
             bitmap = Bitmap.createScaledBitmap(bitmap, w, h, true);
         }
         return bitmap;
     }

     private static Thumbnail createThumbnail(Uri uri, Bitmap bitmap, int orientation) {
         if (bitmap == null) {
             Log.e(TAG, "Failed to create thumbnail from null bitmap");
             return null;
         }
         try {
             return new Thumbnail(uri, bitmap, orientation);
         } catch (IllegalArgumentException e) {
             Log.e(TAG, "Failed to construct thumbnail", e);
             return null;
         }
     }
 }
	/*
	* Copyright (C) 2011 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.camera;

	import android.content.ContentResolver;
	import android.content.ContentUris;
	import android.database.Cursor;
	import android.graphics.Bitmap;
	import android.graphics.BitmapFactory;
	import android.graphics.Matrix;
	import android.media.MediaMetadataRetriever;
	import android.net.Uri;
	import android.provider.MediaStore.Images;
	import android.provider.MediaStore.Images.ImageColumns;
	import android.provider.MediaStore.MediaColumns;
	import android.provider.MediaStore.Video;
	import android.provider.MediaStore.Video.VideoColumns;
	import android.util.Log;

	import java.io.BufferedInputStream;
	import java.io.BufferedOutputStream;
	import java.io.DataInputStream;
	import java.io.DataOutputStream;
	import java.io.File;
	import java.io.FileDescriptor;
	import java.io.FileInputStream;
	import java.io.FileOutputStream;
	import java.io.IOException;

	public class Thumbnail {
	private static final String TAG = "Thumbnail";

	public static final String LAST_THUMB_FILENAME = "last_thumb";
	private static final int BUFSIZE = 4096;

	private Uri mUri;
	private Bitmap mBitmap;
	// whether this thumbnail is read from file
	private boolean mFromFile = false;

	// Camera, VideoCamera, and Panorama share the same thumbnail. Use sLock
	// to serialize the access.
	private static Object sLock = new Object();

	public Thumbnail(Uri uri, Bitmap bitmap, int orientation) {
	mUri = uri;
	mBitmap = rotateImage(bitmap, orientation);
	if (mBitmap == null) throw new IllegalArgumentException("null bitmap");
	}

	public Uri getUri() {
	return mUri;
	}

	public Bitmap getBitmap() {
	return mBitmap;
	}

	public void setFromFile(boolean fromFile) {
	mFromFile = fromFile;
	}

	public boolean fromFile() {
	return mFromFile;
	}

	private static Bitmap rotateImage(Bitmap bitmap, int orientation) {
	if (orientation != 0) {
	// We only rotate the thumbnail once even if we get OOM.
	Matrix m = new Matrix();
	m.setRotate(orientation, bitmap.getWidth() * 0.5f,
	bitmap.getHeight() * 0.5f);

	try {
	Bitmap rotated = Bitmap.createBitmap(bitmap, 0, 0,
	bitmap.getWidth(), bitmap.getHeight(), m, true);
	// If the rotated bitmap is the original bitmap, then it
	// should not be recycled.
	if (rotated != bitmap) bitmap.recycle();
	return rotated;
	} catch (Throwable t) {
	Log.w(TAG, "Failed to rotate thumbnail", t);
	}
	}
	return bitmap;
	}

	// Stores the bitmap to the specified file.
	public void saveTo(File file) {
	FileOutputStream f = null;
	BufferedOutputStream b = null;
	DataOutputStream d = null;
	synchronized (sLock) {
	try {
	f = new FileOutputStream(file);
	b = new BufferedOutputStream(f, BUFSIZE);
	d = new DataOutputStream(b);
	d.writeUTF(mUri.toString());
	mBitmap.compress(Bitmap.CompressFormat.JPEG, 90, d);
	d.close();
	} catch (IOException e) {
	Log.e(TAG, "Fail to store bitmap. path=" + file.getPath(), e);
	} finally {
	Util.closeSilently(f);
	Util.closeSilently(b);
	Util.closeSilently(d);
	}
	}
	}

	// Loads the data from the specified file.
	// Returns null if failure.
	public static Thumbnail loadFrom(File file) {
	Uri uri = null;
	Bitmap bitmap = null;
	FileInputStream f = null;
	BufferedInputStream b = null;
	DataInputStream d = null;
	synchronized (sLock) {
	try {
	f = new FileInputStream(file);
	b = new BufferedInputStream(f, BUFSIZE);
	d = new DataInputStream(b);
	uri = Uri.parse(d.readUTF());
	bitmap = BitmapFactory.decodeStream(d);
	d.close();
	} catch (IOException e) {
	Log.i(TAG, "Fail to load bitmap. " + e);
	return null;
	} finally {
	Util.closeSilently(f);
	Util.closeSilently(b);
	Util.closeSilently(d);
	}
	}
	Thumbnail thumbnail = createThumbnail(uri, bitmap, 0);
	if (thumbnail != null) thumbnail.setFromFile(true);
	return thumbnail;
	}

	public static Thumbnail getLastThumbnail(ContentResolver resolver) {
	Media image = getLastImageThumbnail(resolver);
	Media video = getLastVideoThumbnail(resolver);
	if (image == null && video == null) return null;

	Bitmap bitmap = null;
	Media lastMedia;
	// If there is only image or video, get its thumbnail. If both exist,
	// get the thumbnail of the one that is newer.
	if (image != null && (video == null \|\| image.dateTaken >= video.dateTaken)) {
	bitmap = Images.Thumbnails.getThumbnail(resolver, image.id,
	Images.Thumbnails.MINI_KIND, null);
	lastMedia = image;
	} else {
	bitmap = Video.Thumbnails.getThumbnail(resolver, video.id,
	Video.Thumbnails.MINI_KIND, null);
	lastMedia = video;
	}

	// Ensure database and storage are in sync.
	if (Util.isUriValid(lastMedia.uri, resolver)) {
	return createThumbnail(lastMedia.uri, bitmap, lastMedia.orientation);
	}
	return null;
	}

	private static class Media {
	public Media(long id, int orientation, long dateTaken, Uri uri) {
	this.id = id;
	this.orientation = orientation;
	this.dateTaken = dateTaken;
	this.uri = uri;
	}

	public final long id;
	public final int orientation;
	public final long dateTaken;
	public final Uri uri;
	}

	public static Media getLastImageThumbnail(ContentResolver resolver) {
	Uri baseUri = Images.Media.EXTERNAL_CONTENT_URI;

	Uri query = baseUri.buildUpon().appendQueryParameter("limit", "1").build();
	String[] projection = new String[] {ImageColumns._ID, ImageColumns.ORIENTATION,
	ImageColumns.DATE_TAKEN};
	String selection = ImageColumns.MIME_TYPE + "='image/jpeg' AND " +
	ImageColumns.BUCKET_ID + '=' + Storage.BUCKET_ID;
	String order = ImageColumns.DATE_TAKEN + " DESC," + ImageColumns._ID + " DESC";

	Cursor cursor = null;
	try {
	cursor = resolver.query(query, projection, selection, null, order);
	if (cursor != null && cursor.moveToFirst()) {
	long id = cursor.getLong(0);
	return new Media(id, cursor.getInt(1), cursor.getLong(2),
	ContentUris.withAppendedId(baseUri, id));
	}
	} finally {
	if (cursor != null) {
	cursor.close();
	}
	}
	return null;
	}

	private static Media getLastVideoThumbnail(ContentResolver resolver) {
	Uri baseUri = Video.Media.EXTERNAL_CONTENT_URI;

	Uri query = baseUri.buildUpon().appendQueryParameter("limit", "1").build();
	String[] projection = new String[] {VideoColumns._ID, MediaColumns.DATA,
	VideoColumns.DATE_TAKEN};
	String selection = VideoColumns.BUCKET_ID + '=' + Storage.BUCKET_ID;
	String order = VideoColumns.DATE_TAKEN + " DESC," + VideoColumns._ID + " DESC";

	Cursor cursor = null;
	try {
	cursor = resolver.query(query, projection, selection, null, order);
	if (cursor != null && cursor.moveToFirst()) {
	Log.d(TAG, "getLastVideoThumbnail: " + cursor.getString(1));
	long id = cursor.getLong(0);
	return new Media(id, 0, cursor.getLong(2),
	ContentUris.withAppendedId(baseUri, id));
	}
	} finally {
	if (cursor != null) {
	cursor.close();
	}
	}
	return null;
	}

	public static Thumbnail createThumbnail(byte[] jpeg, int orientation, int inSampleSize,
	Uri uri) {
	// Create the thumbnail.
	BitmapFactory.Options options = new BitmapFactory.Options();
	options.inSampleSize = inSampleSize;
	Bitmap bitmap = BitmapFactory.decodeByteArray(jpeg, 0, jpeg.length, options);
	return createThumbnail(uri, bitmap, orientation);
	}

	public static Bitmap createVideoThumbnail(FileDescriptor fd, int targetWidth) {
	return createVideoThumbnail(null, fd, targetWidth);
	}

	public static Bitmap createVideoThumbnail(String filePath, int targetWidth) {
	return createVideoThumbnail(filePath, null, targetWidth);
	}

	private static Bitmap createVideoThumbnail(String filePath, FileDescriptor fd, int targetWidth) {
	Bitmap bitmap = null;
	MediaMetadataRetriever retriever = new MediaMetadataRetriever();
	try {
	if (filePath != null) {
	retriever.setDataSource(filePath);
	} else {
	retriever.setDataSource(fd);
	}
	bitmap = retriever.getFrameAtTime(-1);
	} catch (IllegalArgumentException ex) {
	// Assume this is a corrupt video file
	} catch (RuntimeException ex) {
	// Assume this is a corrupt video file.
	} finally {
	try {
	retriever.release();
	} catch (RuntimeException ex) {
	// Ignore failures while cleaning up.
	}
	}
	if (bitmap == null) return null;

	// Scale down the bitmap if it is bigger than we need.
	int width = bitmap.getWidth();
	int height = bitmap.getHeight();
	if (width > targetWidth) {
	float scale = (float) targetWidth / width;
	int w = Math.round(scale * width);
	int h = Math.round(scale * height);
	bitmap = Bitmap.createScaledBitmap(bitmap, w, h, true);
	}
	return bitmap;
	}

	private static Thumbnail createThumbnail(Uri uri, Bitmap bitmap, int orientation) {
	if (bitmap == null) {
	Log.e(TAG, "Failed to create thumbnail from null bitmap");
	return null;
	}
	try {
	return new Thumbnail(uri, bitmap, orientation);
	} catch (IllegalArgumentException e) {
	Log.e(TAG, "Failed to construct thumbnail", e);
	return null;
	}
	}
	}