Android Bitmap Size Get computeSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels)

Description

compute Sample Size

License

Apache License

Declaration

public static int computeSampleSize(BitmapFactory.Options options,
            int minSideLength, int maxNumOfPixels) 

Method Source Code

/*/* w  ww .ja  va2 s.  c  o  m*/
 * 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.
 */

import android.app.Activity;
import android.app.AlertDialog;
import android.app.admin.DevicePolicyManager;
import android.content.ActivityNotFoundException;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.RectF;
import android.hardware.Camera;
import android.hardware.Camera.CameraInfo;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.Size;
import android.location.Location;
import android.net.Uri;
import android.os.Handler;
import android.os.ParcelFileDescriptor;
import android.telephony.TelephonyManager;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.TypedValue;
import android.view.Display;
import android.view.OrientationEventListener;
import android.view.Surface;
import android.view.View;
import android.view.WindowManager;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.widget.Toast;
import com.android.camera.CameraActivity;
import com.android.camera.CameraDisabledException;
import com.android.camera.CameraHolder;
import com.android.camera.CameraManager;
import com.android.camera.util.IntentHelper;
import com.android.camera2.R;
import java.io.Closeable;
import java.io.IOException;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.StringTokenizer;

public class Main{
    public static int computeSampleSize(BitmapFactory.Options options,
            int minSideLength, int maxNumOfPixels) {
        int initialSize = computeInitialSampleSize(options, minSideLength,
                maxNumOfPixels);

        int roundedSize;
        if (initialSize <= 8) {
            roundedSize = 1;
            while (roundedSize < initialSize) {
                roundedSize <<= 1;
            }
        } else {
            roundedSize = (initialSize + 7) / 8 * 8;
        }

        return roundedSize;
    }
    private static int computeInitialSampleSize(
            BitmapFactory.Options options, int minSideLength,
            int maxNumOfPixels) {
        double w = options.outWidth;
        double h = options.outHeight;

        int lowerBound = (maxNumOfPixels < 0) ? 1 : (int) Math.ceil(Math
                .sqrt(w * h / maxNumOfPixels));
        int upperBound = (minSideLength < 0) ? 128 : (int) Math.min(
                Math.floor(w / minSideLength),
                Math.floor(h / minSideLength));

        if (upperBound < lowerBound) {
            // return the larger one when there is no overlapping zone.
            return lowerBound;
        }

        if (maxNumOfPixels < 0 && minSideLength < 0) {
            return 1;
        } else if (minSideLength < 0) {
            return lowerBound;
        } else {
            return upperBound;
        }
    }
}

Related

1. bitmapSize(Bitmap bitmap)
2. calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight)
3. calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight)
4. calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight)
5. computeInitialSampleSize( BitmapFactory.Options options, int minSideLength, int maxNumOfPixels)
6. computeSampleSize(BitmapFactory.Options options, int target)
7. getBitmapSize(String filePath)
8. getImageWH(String path)
9. inSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight)