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/*
* Copyright (C) 2009 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.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.media.MediaMetadataRetriever;
import android.os.ParcelFileDescriptor;
import android.util.Log;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
/**
* Collection of utility functions used in this package.
*/
public class Util {
private static final boolean VERBOSE = false;
private static final String TAG = "db.Util";
private Util() {
}
// Rotates the bitmap by the specified degree.
// If a new bitmap is created, the original bitmap is recycled.
public static Bitmap rotate(Bitmap b, int degrees) {
if (degrees != 0 && b != null) {
Matrix m = new Matrix();
m.setRotate(degrees,
(float) b.getWidth() / 2, (float) b.getHeight() / 2);
try {
Bitmap b2 = Bitmap.createBitmap(
b, 0, 0, b.getWidth(), b.getHeight(), m, true);
if (b != b2) {
b.recycle();
b = b2;
}
} catch (OutOfMemoryError ex) {
// We have no memory to rotate. Return the original bitmap.
}
}
return b;
}
/*
* Compute the sample size as a function of the image size and the target.
* Scale the image down so that both the width and height are just above the
* target. If this means that one of the dimension goes from above the
* target to below the target (e.g. given a width of 480 and an image width
* of 600 but sample size of 2 -- i.e. new width 300 -- bump the sample size
* down by 1.
*/
public static int computeSampleSize(
BitmapFactory.Options options, int target) {
int w = options.outWidth;
int h = options.outHeight;
int candidateW = w / target;
int candidateH = h / target;
int candidate = Math.max(candidateW, candidateH);
if (candidate == 0) return 1;
if (candidate > 1) {
if ((w > target) && (w / candidate) < target) candidate -= 1;
}
if (candidate > 1) {
if ((h > target) && (h / candidate) < target) candidate -= 1;
}
if (VERBOSE) {
Log.v(TAG, "for w/h " + w + "/" + h + " returning " + candidate
+ "(" + (w / candidate) + " / " + (h / candidate));
}
return candidate;
}
/**
* Creates a centered bitmap of the desired size. Recycles the input.
* @param source
*/
public static Bitmap extractMiniThumb(
Bitmap source, int width, int height) {
return Util.extractMiniThumb(source, width, height, true);
}
public static Bitmap extractMiniThumb(
Bitmap source, int width, int height, boolean recycle) {
if (source == null) {
return null;
}
float scale;
if (source.getWidth() < source.getHeight()) {
scale = width / (float) source.getWidth();
} else {
scale = height / (float) source.getHeight();
}
Matrix matrix = new Matrix();
matrix.setScale(scale, scale);
Bitmap miniThumbnail = ImageLoader.transform(matrix, source,
width, height, false);
if (recycle && miniThumbnail != source) {
source.recycle();
}
return miniThumbnail;
}
/**
* Creates a byte[] for a given bitmap of the desired size. Recycles the
* input bitmap.
*/
public static byte[] miniThumbData(Bitmap source) {
if (source == null) return null;
Bitmap miniThumbnail = extractMiniThumb(
source, ImageManager.MINI_THUMB_TARGET_SIZE,
ImageManager.MINI_THUMB_TARGET_SIZE);
ByteArrayOutputStream miniOutStream = new ByteArrayOutputStream();
miniThumbnail.compress(Bitmap.CompressFormat.JPEG, 75, miniOutStream);
miniThumbnail.recycle();
try {
miniOutStream.close();
byte [] data = miniOutStream.toByteArray();
return data;
} catch (java.io.IOException ex) {
Log.e(TAG, "got exception ex " + ex);
}
return null;
}
/**
* @return true if the mimetype is a video mimetype.
*/
public static boolean isVideoMimeType(String mimeType) {
return mimeType.startsWith("video/");
}
/**
* Create a video thumbnail for a video. May return null if the video is
* corrupt.
*
* @param filePath
*/
public static Bitmap createVideoThumbnail(String filePath) {
Bitmap bitmap = null;
MediaMetadataRetriever retriever = new MediaMetadataRetriever();
try {
retriever.setMode(MediaMetadataRetriever.MODE_CAPTURE_FRAME_ONLY);
retriever.setDataSource(filePath);
bitmap = retriever.captureFrame();
} 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.
}
}
return bitmap;
}
public static int indexOf(String [] array, String s) {
for (int i = 0; i < array.length; i++) {
if (array[i].equals(s)) {
return i;
}
}
return -1;
}
public static void closeSiliently(Closeable c) {
if (c == null) return;
try {
c.close();
} catch (Throwable t) {
// do nothing
}
}
public static void closeSiliently(ParcelFileDescriptor c) {
if (c == null) return;
try {
c.close();
} catch (Throwable t) {
// do nothing
}
}
}
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