gistfile1.txt

import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.Build;
import android.renderscript.Allocation;
import android.renderscript.Element;
import android.renderscript.RenderScript;
import android.renderscript.ScriptIntrinsicBlur;

import com.squareup.picasso.Transformation;

public class BlurTransform implements Transformation {
    private RenderScript rs;
    private float radius;
    private boolean recycleBitmap;


    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public BlurTransform(Context context, float radius, boolean recycleBitmap) {
        super();
        rs = RenderScript.create(context);
        this.radius = radius;
        this.recycleBitmap = recycleBitmap;
    }

    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
    @Override
    public Bitmap transform(Bitmap bitmap) {
        // Create another bitmap that will hold the results of the filter.
        Bitmap blurredBitmap = Bitmap.createBitmap(bitmap);

        // Allocate memory for Renderscript to work with
        Allocation input;

        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2)
            input = Allocation.createFromBitmap(rs, bitmap, Allocation.MipmapControl.MIPMAP_FULL, Allocation.USAGE_SHARED);
        else
            input = Allocation.createFromBitmap(rs, bitmap, Allocation.MipmapControl.MIPMAP_FULL, Allocation.USAGE_SCRIPT);

        Allocation output = Allocation.createTyped(rs, input.getType());

        // Load up an instance of the specific script that we want to use.
        ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
        script.setInput(input);

        // Set the blur radius
        script.setRadius(radius);

        // Start the ScriptIntrinisicBlur
        script.forEach(output);

        // Copy the output to the blurred bitmap
        output.copyTo(blurredBitmap);

        // Recycle the original bitmap
        if (recycleBitmap) bitmap.recycle();

        return blurredBitmap;
    }

    @Override
    public String key() {
        return "blur";
    }

}