552 lines
20 KiB
Java
552 lines
20 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.net.Uri;
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import android.os.ParcelFileDescriptor;
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import android.provider.BaseColumns;
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import android.provider.MediaStore.Images;
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import android.provider.MediaStore.Images.Thumbnails;
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import android.util.Log;
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import android.content.ContentResolver;
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import android.content.ContentUris;
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import android.content.ContentValues;
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import android.database.Cursor;
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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 java.io.ByteArrayOutputStream;
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import java.io.FileDescriptor;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.OutputStream;
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/**
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* Thumbnail generation routines for media provider. This class should only be used internaly.
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* {@hide} THIS IS NOT FOR PUBLIC API.
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*/
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public class ThumbnailUtil {
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private static final String TAG = "ThumbnailUtil";
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//Whether we should recycle the input (unless the output is the input).
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public static final boolean RECYCLE_INPUT = true;
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public static final boolean NO_RECYCLE_INPUT = false;
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public static final boolean ROTATE_AS_NEEDED = true;
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public static final boolean NO_ROTATE = false;
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public static final boolean USE_NATIVE = true;
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public static final boolean NO_NATIVE = false;
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public static final int THUMBNAIL_TARGET_SIZE = 320;
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public static final int MINI_THUMB_TARGET_SIZE = 96;
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public static final int THUMBNAIL_MAX_NUM_PIXELS = 512 * 384;
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public static final int MINI_THUMB_MAX_NUM_PIXELS = 128 * 128;
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public static final int UNCONSTRAINED = -1;
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// Returns Options that set the native alloc flag for Bitmap decode.
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public static BitmapFactory.Options createNativeAllocOptions() {
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BitmapFactory.Options options = new BitmapFactory.Options();
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options.inNativeAlloc = true;
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return options;
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}
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/**
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* Make a bitmap from a given Uri.
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*
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* @param uri
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*/
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public static Bitmap makeBitmap(int minSideLength, int maxNumOfPixels,
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Uri uri, ContentResolver cr) {
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return makeBitmap(minSideLength, maxNumOfPixels, uri, cr,
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NO_NATIVE);
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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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public 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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public static Bitmap makeBitmap(int minSideLength, int maxNumOfPixels,
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Uri uri, ContentResolver cr, boolean useNative) {
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ParcelFileDescriptor input = null;
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try {
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input = cr.openFileDescriptor(uri, "r");
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BitmapFactory.Options options = null;
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if (useNative) {
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options = createNativeAllocOptions();
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}
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return makeBitmap(minSideLength, maxNumOfPixels, uri, cr, input,
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options);
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} catch (IOException ex) {
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Log.e(TAG, "", ex);
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return null;
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} finally {
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closeSilently(input);
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}
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}
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// Rotates the bitmap by the specified degree.
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// If a new bitmap is created, the original bitmap is recycled.
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public static Bitmap rotate(Bitmap b, int degrees) {
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if (degrees != 0 && b != null) {
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Matrix m = new Matrix();
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m.setRotate(degrees,
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(float) b.getWidth() / 2, (float) b.getHeight() / 2);
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try {
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Bitmap b2 = Bitmap.createBitmap(
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b, 0, 0, b.getWidth(), b.getHeight(), m, true);
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if (b != b2) {
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b.recycle();
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b = b2;
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}
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} catch (OutOfMemoryError ex) {
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// We have no memory to rotate. Return the original bitmap.
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}
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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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public 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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/**
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* Creates a centered bitmap of the desired size.
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* @param source
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* @param recycle whether we want to recycle the input
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*/
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public static Bitmap extractMiniThumb(
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Bitmap source, int width, int height, boolean recycle) {
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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 miniThumbnail = transform(matrix, source, width, height, true, recycle);
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return miniThumbnail;
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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.
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*
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* @param filePath
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*/
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public static Bitmap createVideoThumbnail(String filePath) {
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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.setMode(MediaMetadataRetriever.MODE_CAPTURE_FRAME_ONLY);
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retriever.setDataSource(filePath);
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bitmap = retriever.captureFrame();
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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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return bitmap;
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}
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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 cr ContentResolver
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* @param filePath file path needed by EXIF interface
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* @param uri URI of original image
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* @param origId image id
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* @param kind either MINI_KIND or MICRO_KIND
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* @param saveImage Whether to save MINI_KIND thumbnail obtained in this method.
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* @return Bitmap
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*/
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public static Bitmap createImageThumbnail(ContentResolver cr, String filePath, Uri uri,
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long origId, int kind, boolean saveMini) {
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boolean wantMini = (kind == Images.Thumbnails.MINI_KIND || saveMini);
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int targetSize = wantMini ?
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ThumbnailUtil.THUMBNAIL_TARGET_SIZE : ThumbnailUtil.MINI_THUMB_TARGET_SIZE;
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int maxPixels = wantMini ?
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ThumbnailUtil.THUMBNAIL_MAX_NUM_PIXELS : ThumbnailUtil.MINI_THUMB_MAX_NUM_PIXELS;
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byte[] thumbData = null;
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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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thumbData = createThumbnailFromEXIF(filePath, targetSize);
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}
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if (thumbData != null) {
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BitmapFactory.Options options = new BitmapFactory.Options();
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options.inSampleSize = computeSampleSize(options, targetSize, maxPixels);
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options.inDither = false;
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options.inPreferredConfig = Bitmap.Config.ARGB_8888;
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options.inJustDecodeBounds = false;
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bitmap = BitmapFactory.decodeByteArray(thumbData, 0, thumbData.length, options);
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}
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if (bitmap == null) {
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bitmap = ThumbnailUtil.makeBitmap(targetSize, maxPixels, uri, cr);
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}
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if (bitmap == null) {
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return null;
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}
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if (saveMini) {
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if (thumbData != null) {
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ThumbnailUtil.storeThumbnail(cr, origId, thumbData, bitmap.getWidth(),
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bitmap.getHeight());
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} else {
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ThumbnailUtil.storeThumbnail(cr, origId, bitmap);
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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 = ThumbnailUtil.extractMiniThumb(bitmap,
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ThumbnailUtil.MINI_THUMB_TARGET_SIZE,
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ThumbnailUtil.MINI_THUMB_TARGET_SIZE, ThumbnailUtil.RECYCLE_INPUT);
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}
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return bitmap;
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}
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public 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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boolean scaleUp,
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boolean recycle) {
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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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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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private static final String[] THUMB_PROJECTION = new String[] {
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BaseColumns._ID // 0
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};
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/**
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* Look up thumbnail uri by given imageId, it will be automatically created if it's not created
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* yet. Most of the time imageId is identical to thumbId, but it's not always true.
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* @param req
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* @param width
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* @param height
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* @return Uri Thumbnail uri
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*/
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private static Uri getImageThumbnailUri(ContentResolver cr, long origId, int width, int height) {
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Uri thumbUri = Images.Thumbnails.EXTERNAL_CONTENT_URI;
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Cursor c = cr.query(thumbUri, THUMB_PROJECTION,
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Thumbnails.IMAGE_ID + "=?",
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new String[]{String.valueOf(origId)}, null);
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if (c == null) return null;
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try {
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if (c.moveToNext()) {
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return ContentUris.withAppendedId(thumbUri, c.getLong(0));
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}
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} finally {
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if (c != null) c.close();
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}
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ContentValues values = new ContentValues(4);
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values.put(Thumbnails.KIND, Thumbnails.MINI_KIND);
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values.put(Thumbnails.IMAGE_ID, origId);
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values.put(Thumbnails.HEIGHT, height);
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values.put(Thumbnails.WIDTH, width);
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try {
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return cr.insert(thumbUri, values);
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} catch (Exception ex) {
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Log.w(TAG, ex);
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return null;
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}
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}
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/**
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* Store a given thumbnail in the database. (Bitmap)
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*/
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private static boolean storeThumbnail(ContentResolver cr, long origId, Bitmap thumb) {
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if (thumb == null) return false;
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try {
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Uri uri = getImageThumbnailUri(cr, origId, thumb.getWidth(), thumb.getHeight());
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if (uri == null) return false;
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OutputStream thumbOut = cr.openOutputStream(uri);
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thumb.compress(Bitmap.CompressFormat.JPEG, 85, thumbOut);
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thumbOut.close();
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return true;
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} catch (Throwable t) {
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Log.e(TAG, "Unable to store thumbnail", t);
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return false;
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}
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}
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/**
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* Store a given thumbnail in the database. (byte array)
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*/
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private static boolean storeThumbnail(ContentResolver cr, long origId, byte[] jpegThumbnail,
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int width, int height) {
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if (jpegThumbnail == null) return false;
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Uri uri = getImageThumbnailUri(cr, origId, width, height);
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if (uri == null) {
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return false;
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}
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try {
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OutputStream thumbOut = cr.openOutputStream(uri);
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thumbOut.write(jpegThumbnail);
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thumbOut.close();
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return true;
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} catch (Throwable t) {
|
|
Log.e(TAG, "Unable to store thumbnail", t);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// Extract thumbnail in image that meets the targetSize criteria.
|
|
static byte[] createThumbnailFromEXIF(String filePath, int targetSize) {
|
|
if (filePath == null) return null;
|
|
|
|
try {
|
|
ExifInterface exif = new ExifInterface(filePath);
|
|
if (exif == null) return null;
|
|
byte [] thumbData = exif.getThumbnail();
|
|
if (thumbData == null) return null;
|
|
// Sniff the size of the EXIF thumbnail before decoding it. Photos
|
|
// from the device will pass, but images that are side loaded from
|
|
// other cameras may not.
|
|
BitmapFactory.Options options = new BitmapFactory.Options();
|
|
options.inJustDecodeBounds = true;
|
|
BitmapFactory.decodeByteArray(thumbData, 0, thumbData.length, options);
|
|
|
|
int width = options.outWidth;
|
|
int height = options.outHeight;
|
|
|
|
if (width >= targetSize && height >= targetSize) {
|
|
return thumbData;
|
|
}
|
|
} catch (IOException ex) {
|
|
Log.w(TAG, ex);
|
|
}
|
|
return null;
|
|
}
|
|
}
|