compute Initial Sample Size - Android Graphics

Android examples for Graphics:Bitmap Size

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Description

compute Initial Sample Size

Demo Code

/*/*from   w  w w .  j  a  v a  2 s .c  om*/
 * 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.graphics.BitmapFactory;

public class Main {
   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;
    }
  }
}

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