package com.mapbox.mapboxsdk.snapshotter;

import android.graphics.BitmapFactory;

class MapSnaphotUtil {

  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;

      // Calculate the largest inSampleSize value that is a power of 2 and keeps both
      // height and width larger than the requested height and width.
      while ((halfHeight / inSampleSize) >= reqHeight
        && (halfWidth / inSampleSize) >= reqWidth) {
        inSampleSize *= 2;
      }
    }
    return inSampleSize;
  }


}