compute Initial Bitmap Sample Size - Android Graphics

Android examples for Graphics:Bitmap Sample Size

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Description

compute Initial Bitmap Sample Size

Demo Code


//package com.java2s;
import android.graphics.BitmapFactory;

public class Main {
    private static int computeInitialSampleSize(
            BitmapFactory.Options options, int minSideLength,
            int maxNumOfPixels) {
        double w = options.outWidth;
        double h = options.outHeight;

        int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math
                .sqrt(w * h / maxNumOfPixels));
        int upperBound = (minSideLength == -1) ? 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;
        }/*www  . j  av a2 s  . c o m*/

        if ((maxNumOfPixels == -1) && (minSideLength == -1)) {
            return 1;

        } else if (minSideLength == -1) {
            return lowerBound;

        } else {
            return upperBound;
        }
    }
}

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