package at.favre.lib.dali.blur.algorithms;
import android.graphics.Bitmap;
import android.support.v8.renderscript.Allocation;
import android.support.v8.renderscript.Element;
import android.support.v8.renderscript.RenderScript;
import android.support.v8.renderscript.ScriptIntrinsicConvolve5x5;
import at.favre.lib.dali.blur.BlurKernels;
import at.favre.lib.dali.blur.IBlur;
/**
* This is a convolve matrix based blur algorithms powered by Renderscript's ScriptIntrinsicConvolve class. This uses a gaussian kernel.
* Instead of radius it uses passes, so a radius parameter of 16 makes the convolve algorithm applied 16 times onto the image.
*/
public class RenderScriptGaussian5x5Blur implements IBlur {
private RenderScript rs;
public RenderScriptGaussian5x5Blur(RenderScript rs) {
this.rs = rs;
}
@Override
public Bitmap blur(int radius, Bitmap bitmapOriginal) {
Allocation input = Allocation.createFromBitmap(rs, bitmapOriginal);
final Allocation output = Allocation.createTyped(rs, input.getType());
final ScriptIntrinsicConvolve5x5 script = ScriptIntrinsicConvolve5x5.create(rs, Element.U8_4(rs));
script.setCoefficients(BlurKernels.GAUSSIAN_5x5);
for (int i = 0; i < radius; i++) {
script.setInput(input);
script.forEach(output);
input = output;
}
output.copyTo(bitmapOriginal);
return bitmapOriginal;
}
}