522 lines
19 KiB
Java
522 lines
19 KiB
Java
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.media;
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import android.content.ContentResolver;
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import android.graphics.Bitmap;
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import android.graphics.BitmapFactory;
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import android.graphics.Canvas;
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import android.graphics.Matrix;
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import android.graphics.Rect;
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import android.media.MediaMetadataRetriever;
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import android.media.MediaFile.MediaFileType;
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import android.net.Uri;
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import android.os.ParcelFileDescriptor;
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import android.provider.MediaStore.Images;
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import android.util.Log;
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import java.io.FileInputStream;
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import java.io.FileDescriptor;
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import java.io.IOException;
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/**
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* Thumbnail generation routines for media provider.
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*/
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public class ThumbnailUtils {
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private static final String TAG = "ThumbnailUtils";
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/* Maximum pixels size for created bitmap. */
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private static final int MAX_NUM_PIXELS_THUMBNAIL = 512 * 384;
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private static final int MAX_NUM_PIXELS_MICRO_THUMBNAIL = 160 * 120;
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private static final int UNCONSTRAINED = -1;
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/* Options used internally. */
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private static final int OPTIONS_NONE = 0x0;
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private static final int OPTIONS_SCALE_UP = 0x1;
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/**
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* Constant used to indicate we should recycle the input in
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* {@link #extractThumbnail(Bitmap, int, int, int)} unless the output is the input.
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*/
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public static final int OPTIONS_RECYCLE_INPUT = 0x2;
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/**
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* Constant used to indicate the dimension of mini thumbnail.
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* @hide Only used by media framework and media provider internally.
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*/
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public static final int TARGET_SIZE_MINI_THUMBNAIL = 320;
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/**
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* Constant used to indicate the dimension of micro thumbnail.
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* @hide Only used by media framework and media provider internally.
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*/
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public static final int TARGET_SIZE_MICRO_THUMBNAIL = 96;
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/**
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* This method first examines if the thumbnail embedded in EXIF is bigger than our target
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* size. If not, then it'll create a thumbnail from original image. Due to efficiency
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* consideration, we want to let MediaThumbRequest avoid calling this method twice for
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* both kinds, so it only requests for MICRO_KIND and set saveImage to true.
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*
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* This method always returns a "square thumbnail" for MICRO_KIND thumbnail.
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*
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* @param filePath the path of image file
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* @param kind could be MINI_KIND or MICRO_KIND
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* @return Bitmap, or null on failures
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*
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* @hide This method is only used by media framework and media provider internally.
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*/
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public static Bitmap createImageThumbnail(String filePath, int kind) {
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boolean wantMini = (kind == Images.Thumbnails.MINI_KIND);
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int targetSize = wantMini
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? TARGET_SIZE_MINI_THUMBNAIL
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: TARGET_SIZE_MICRO_THUMBNAIL;
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int maxPixels = wantMini
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? MAX_NUM_PIXELS_THUMBNAIL
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: MAX_NUM_PIXELS_MICRO_THUMBNAIL;
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SizedThumbnailBitmap sizedThumbnailBitmap = new SizedThumbnailBitmap();
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Bitmap bitmap = null;
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MediaFileType fileType = MediaFile.getFileType(filePath);
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if (fileType != null && fileType.fileType == MediaFile.FILE_TYPE_JPEG) {
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createThumbnailFromEXIF(filePath, targetSize, maxPixels, sizedThumbnailBitmap);
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bitmap = sizedThumbnailBitmap.mBitmap;
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}
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if (bitmap == null) {
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FileInputStream stream = null;
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try {
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stream = new FileInputStream(filePath);
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FileDescriptor fd = stream.getFD();
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BitmapFactory.Options options = new BitmapFactory.Options();
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options.inSampleSize = 1;
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options.inJustDecodeBounds = true;
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BitmapFactory.decodeFileDescriptor(fd, null, options);
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if (options.mCancel || options.outWidth == -1
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|| options.outHeight == -1) {
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return null;
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}
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options.inSampleSize = computeSampleSize(
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options, targetSize, maxPixels);
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options.inJustDecodeBounds = false;
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options.inDither = false;
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options.inPreferredConfig = Bitmap.Config.ARGB_8888;
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bitmap = BitmapFactory.decodeFileDescriptor(fd, null, options);
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} catch (IOException ex) {
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Log.e(TAG, "", ex);
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} catch (OutOfMemoryError oom) {
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Log.e(TAG, "Unable to decode file " + filePath + ". OutOfMemoryError.", oom);
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} finally {
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try {
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if (stream != null) {
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stream.close();
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}
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} catch (IOException ex) {
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Log.e(TAG, "", ex);
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}
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}
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}
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if (kind == Images.Thumbnails.MICRO_KIND) {
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// now we make it a "square thumbnail" for MICRO_KIND thumbnail
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bitmap = extractThumbnail(bitmap,
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TARGET_SIZE_MICRO_THUMBNAIL,
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TARGET_SIZE_MICRO_THUMBNAIL, OPTIONS_RECYCLE_INPUT);
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}
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return bitmap;
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}
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/**
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* Create a video thumbnail for a video. May return null if the video is
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* corrupt or the format is not supported.
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*
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* @param filePath the path of video file
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* @param kind could be MINI_KIND or MICRO_KIND
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*/
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public static Bitmap createVideoThumbnail(String filePath, int kind) {
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Bitmap bitmap = null;
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MediaMetadataRetriever retriever = new MediaMetadataRetriever();
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try {
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retriever.setDataSource(filePath);
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bitmap = retriever.getFrameAtTime(-1);
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} catch (IllegalArgumentException ex) {
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// Assume this is a corrupt video file
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} catch (RuntimeException ex) {
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// Assume this is a corrupt video file.
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} finally {
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try {
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retriever.release();
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} catch (RuntimeException ex) {
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// Ignore failures while cleaning up.
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}
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}
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if (bitmap == null) return null;
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if (kind == Images.Thumbnails.MINI_KIND) {
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// Scale down the bitmap if it's too large.
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int width = bitmap.getWidth();
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int height = bitmap.getHeight();
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int max = Math.max(width, height);
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if (max > 512) {
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float scale = 512f / max;
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int w = Math.round(scale * width);
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int h = Math.round(scale * height);
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bitmap = Bitmap.createScaledBitmap(bitmap, w, h, true);
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}
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} else if (kind == Images.Thumbnails.MICRO_KIND) {
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bitmap = extractThumbnail(bitmap,
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TARGET_SIZE_MICRO_THUMBNAIL,
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TARGET_SIZE_MICRO_THUMBNAIL,
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OPTIONS_RECYCLE_INPUT);
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}
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return bitmap;
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}
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/**
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* Creates a centered bitmap of the desired size.
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*
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* @param source original bitmap source
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* @param width targeted width
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* @param height targeted height
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*/
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public static Bitmap extractThumbnail(
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Bitmap source, int width, int height) {
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return extractThumbnail(source, width, height, OPTIONS_NONE);
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}
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/**
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* Creates a centered bitmap of the desired size.
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*
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* @param source original bitmap source
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* @param width targeted width
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* @param height targeted height
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* @param options options used during thumbnail extraction
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*/
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public static Bitmap extractThumbnail(
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Bitmap source, int width, int height, int options) {
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if (source == null) {
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return null;
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}
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float scale;
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if (source.getWidth() < source.getHeight()) {
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scale = width / (float) source.getWidth();
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} else {
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scale = height / (float) source.getHeight();
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}
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Matrix matrix = new Matrix();
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matrix.setScale(scale, scale);
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Bitmap thumbnail = transform(matrix, source, width, height,
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OPTIONS_SCALE_UP | options);
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return thumbnail;
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}
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/*
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* Compute the sample size as a function of minSideLength
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* and maxNumOfPixels.
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* minSideLength is used to specify that minimal width or height of a
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* bitmap.
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* maxNumOfPixels is used to specify the maximal size in pixels that is
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* tolerable in terms of memory usage.
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*
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* The function returns a sample size based on the constraints.
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* Both size and minSideLength can be passed in as IImage.UNCONSTRAINED,
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* which indicates no care of the corresponding constraint.
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* The functions prefers returning a sample size that
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* generates a smaller bitmap, unless minSideLength = IImage.UNCONSTRAINED.
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*
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* Also, the function rounds up the sample size to a power of 2 or multiple
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* of 8 because BitmapFactory only honors sample size this way.
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* For example, BitmapFactory downsamples an image by 2 even though the
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* request is 3. So we round up the sample size to avoid OOM.
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*/
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private static int computeSampleSize(BitmapFactory.Options options,
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int minSideLength, int maxNumOfPixels) {
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int initialSize = computeInitialSampleSize(options, minSideLength,
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maxNumOfPixels);
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int roundedSize;
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if (initialSize <= 8 ) {
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roundedSize = 1;
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while (roundedSize < initialSize) {
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roundedSize <<= 1;
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}
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} else {
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roundedSize = (initialSize + 7) / 8 * 8;
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}
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return roundedSize;
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}
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private static int computeInitialSampleSize(BitmapFactory.Options options,
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int minSideLength, int maxNumOfPixels) {
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double w = options.outWidth;
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double h = options.outHeight;
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int lowerBound = (maxNumOfPixels == UNCONSTRAINED) ? 1 :
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(int) Math.ceil(Math.sqrt(w * h / maxNumOfPixels));
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int upperBound = (minSideLength == UNCONSTRAINED) ? 128 :
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(int) Math.min(Math.floor(w / minSideLength),
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Math.floor(h / minSideLength));
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if (upperBound < lowerBound) {
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// return the larger one when there is no overlapping zone.
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return lowerBound;
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}
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if ((maxNumOfPixels == UNCONSTRAINED) &&
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(minSideLength == UNCONSTRAINED)) {
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return 1;
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} else if (minSideLength == UNCONSTRAINED) {
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return lowerBound;
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} else {
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return upperBound;
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}
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}
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/**
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* Make a bitmap from a given Uri, minimal side length, and maximum number of pixels.
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* The image data will be read from specified pfd if it's not null, otherwise
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* a new input stream will be created using specified ContentResolver.
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*
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* Clients are allowed to pass their own BitmapFactory.Options used for bitmap decoding. A
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* new BitmapFactory.Options will be created if options is null.
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*/
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private static Bitmap makeBitmap(int minSideLength, int maxNumOfPixels,
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Uri uri, ContentResolver cr, ParcelFileDescriptor pfd,
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BitmapFactory.Options options) {
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Bitmap b = null;
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try {
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if (pfd == null) pfd = makeInputStream(uri, cr);
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if (pfd == null) return null;
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if (options == null) options = new BitmapFactory.Options();
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FileDescriptor fd = pfd.getFileDescriptor();
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options.inSampleSize = 1;
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options.inJustDecodeBounds = true;
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BitmapFactory.decodeFileDescriptor(fd, null, options);
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if (options.mCancel || options.outWidth == -1
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|| options.outHeight == -1) {
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return null;
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}
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options.inSampleSize = computeSampleSize(
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options, minSideLength, maxNumOfPixels);
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options.inJustDecodeBounds = false;
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options.inDither = false;
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options.inPreferredConfig = Bitmap.Config.ARGB_8888;
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b = BitmapFactory.decodeFileDescriptor(fd, null, options);
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} catch (OutOfMemoryError ex) {
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Log.e(TAG, "Got oom exception ", ex);
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return null;
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} finally {
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closeSilently(pfd);
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}
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return b;
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}
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private static void closeSilently(ParcelFileDescriptor c) {
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if (c == null) return;
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try {
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c.close();
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} catch (Throwable t) {
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// do nothing
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}
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}
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private static ParcelFileDescriptor makeInputStream(
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Uri uri, ContentResolver cr) {
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try {
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return cr.openFileDescriptor(uri, "r");
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} catch (IOException ex) {
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return null;
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}
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}
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/**
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* Transform source Bitmap to targeted width and height.
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*/
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private static Bitmap transform(Matrix scaler,
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Bitmap source,
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int targetWidth,
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int targetHeight,
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int options) {
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boolean scaleUp = (options & OPTIONS_SCALE_UP) != 0;
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boolean recycle = (options & OPTIONS_RECYCLE_INPUT) != 0;
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int deltaX = source.getWidth() - targetWidth;
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int deltaY = source.getHeight() - targetHeight;
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if (!scaleUp && (deltaX < 0 || deltaY < 0)) {
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/*
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* In this case the bitmap is smaller, at least in one dimension,
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* than the target. Transform it by placing as much of the image
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* as possible into the target and leaving the top/bottom or
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* left/right (or both) black.
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*/
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Bitmap b2 = Bitmap.createBitmap(targetWidth, targetHeight,
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Bitmap.Config.ARGB_8888);
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Canvas c = new Canvas(b2);
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int deltaXHalf = Math.max(0, deltaX / 2);
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int deltaYHalf = Math.max(0, deltaY / 2);
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Rect src = new Rect(
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deltaXHalf,
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deltaYHalf,
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deltaXHalf + Math.min(targetWidth, source.getWidth()),
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deltaYHalf + Math.min(targetHeight, source.getHeight()));
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int dstX = (targetWidth - src.width()) / 2;
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int dstY = (targetHeight - src.height()) / 2;
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Rect dst = new Rect(
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dstX,
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dstY,
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targetWidth - dstX,
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targetHeight - dstY);
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c.drawBitmap(source, src, dst, null);
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if (recycle) {
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source.recycle();
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}
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c.setBitmap(null);
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return b2;
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}
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float bitmapWidthF = source.getWidth();
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float bitmapHeightF = source.getHeight();
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float bitmapAspect = bitmapWidthF / bitmapHeightF;
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float viewAspect = (float) targetWidth / targetHeight;
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if (bitmapAspect > viewAspect) {
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float scale = targetHeight / bitmapHeightF;
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if (scale < .9F || scale > 1F) {
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scaler.setScale(scale, scale);
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} else {
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scaler = null;
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}
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} else {
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float scale = targetWidth / bitmapWidthF;
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if (scale < .9F || scale > 1F) {
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scaler.setScale(scale, scale);
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} else {
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scaler = null;
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}
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}
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Bitmap b1;
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if (scaler != null) {
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// this is used for minithumb and crop, so we want to filter here.
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b1 = Bitmap.createBitmap(source, 0, 0,
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source.getWidth(), source.getHeight(), scaler, true);
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} else {
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b1 = source;
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}
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if (recycle && b1 != source) {
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source.recycle();
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}
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int dx1 = Math.max(0, b1.getWidth() - targetWidth);
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int dy1 = Math.max(0, b1.getHeight() - targetHeight);
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Bitmap b2 = Bitmap.createBitmap(
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b1,
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dx1 / 2,
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dy1 / 2,
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targetWidth,
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targetHeight);
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if (b2 != b1) {
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if (recycle || b1 != source) {
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b1.recycle();
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}
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}
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return b2;
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}
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/**
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* SizedThumbnailBitmap contains the bitmap, which is downsampled either from
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* the thumbnail in exif or the full image.
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* mThumbnailData, mThumbnailWidth and mThumbnailHeight are set together only if mThumbnail
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* is not null.
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*
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* The width/height of the sized bitmap may be different from mThumbnailWidth/mThumbnailHeight.
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*/
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private static class SizedThumbnailBitmap {
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public byte[] mThumbnailData;
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public Bitmap mBitmap;
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public int mThumbnailWidth;
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public int mThumbnailHeight;
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}
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/**
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* Creates a bitmap by either downsampling from the thumbnail in EXIF or the full image.
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* The functions returns a SizedThumbnailBitmap,
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* which contains a downsampled bitmap and the thumbnail data in EXIF if exists.
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*/
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private static void createThumbnailFromEXIF(String filePath, int targetSize,
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int maxPixels, SizedThumbnailBitmap sizedThumbBitmap) {
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if (filePath == null) return;
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ExifInterface exif = null;
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byte [] thumbData = null;
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try {
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exif = new ExifInterface(filePath);
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thumbData = exif.getThumbnail();
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} catch (IOException ex) {
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Log.w(TAG, ex);
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}
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BitmapFactory.Options fullOptions = new BitmapFactory.Options();
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BitmapFactory.Options exifOptions = new BitmapFactory.Options();
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int exifThumbWidth = 0;
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int fullThumbWidth = 0;
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// Compute exifThumbWidth.
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if (thumbData != null) {
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exifOptions.inJustDecodeBounds = true;
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BitmapFactory.decodeByteArray(thumbData, 0, thumbData.length, exifOptions);
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exifOptions.inSampleSize = computeSampleSize(exifOptions, targetSize, maxPixels);
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exifThumbWidth = exifOptions.outWidth / exifOptions.inSampleSize;
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}
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// Compute fullThumbWidth.
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fullOptions.inJustDecodeBounds = true;
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BitmapFactory.decodeFile(filePath, fullOptions);
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fullOptions.inSampleSize = computeSampleSize(fullOptions, targetSize, maxPixels);
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fullThumbWidth = fullOptions.outWidth / fullOptions.inSampleSize;
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// Choose the larger thumbnail as the returning sizedThumbBitmap.
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if (thumbData != null && exifThumbWidth >= fullThumbWidth) {
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int width = exifOptions.outWidth;
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int height = exifOptions.outHeight;
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exifOptions.inJustDecodeBounds = false;
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sizedThumbBitmap.mBitmap = BitmapFactory.decodeByteArray(thumbData, 0,
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thumbData.length, exifOptions);
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if (sizedThumbBitmap.mBitmap != null) {
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sizedThumbBitmap.mThumbnailData = thumbData;
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sizedThumbBitmap.mThumbnailWidth = width;
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sizedThumbBitmap.mThumbnailHeight = height;
|
|
}
|
|
} else {
|
|
fullOptions.inJustDecodeBounds = false;
|
|
sizedThumbBitmap.mBitmap = BitmapFactory.decodeFile(filePath, fullOptions);
|
|
}
|
|
}
|
|
}
|