Android Open Source - Helpers Bitmap Helper

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License

The source code is released under:

MIT License

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Java Source Code

package at.wrdlbrnft.helpers;
/*w  w  w  .j  ava 2 s  .c  om*/
import android.content.Context;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

import java.io.File;
import java.io.InputStream;

/**
 * Created with IntelliJ Idea 13
 * User: Xaver
 * Date: 26/05/14
 */
public class BitmapHelper {

    public static int calculateInSampleSize(BitmapFactory.Options options, float reqWidth, float reqHeight) {
        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;
    }

    public static BitmapFactory.Options decodeBounds(Context context, int resId) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeResource(context.getResources(), resId, options);
        options.inJustDecodeBounds = false;
        return options;
    }

    public static BitmapFactory.Options decodeBounds(InputStream stream) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(stream, null, options);
        options.inJustDecodeBounds = false;
        return options;
    }

    public static BitmapFactory.Options decodeBounds(String path) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(path, options);
        options.inJustDecodeBounds = false;
        return options;
    }
}

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