Calculate the largest inSampleSize value that is a power of 2 and keeps both height and width larger than the requested height and width. - Android Graphics

Android examples for Graphics:Bitmap Size

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Description

Calculate the largest inSampleSize value that is a power of 2 and keeps both height and width larger than the requested height and width.

Demo Code


//package com.book2s;

import android.graphics.BitmapFactory;

public class Main {
    public static int calculateInSampleSize(BitmapFactory.Options options,
            int reqWidth, int reqHeight) {
        // Raw height and width of image
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {

            final int halfHeight = height / 2;
            final int halfWidth = width / 2;

            while ((halfHeight / inSampleSize) > reqHeight
                    && (halfWidth / inSampleSize) > reqWidth) {
                inSampleSize *= 2;//from www .  j a va  2 s  .co  m
            }
        }

        return inSampleSize;
    }
}

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