title: Android: fast bitmap blur?
body: <p>I've been searching the past three days for a built-in, hardware-accelerated way of bluring a bitmap with android. I stumbled upon certain work-arounds like shrinking the bitmap and scaling it up again, but this method produced low quality results which were not suitable for my image recognition requirements. I also read that implementing convolution with shaders or JNI is a good way to go, but I cannot believe that there is no built-in solution in the Android framework for this very common purpose. Currently I've ended up with a self-written convolution implementation in Java, but it is awkwardly slow. My question is:</p>
  
  <ul>
  <li>Is there <em>really no built-in solution</em> in the Android framework?</li>
  <li>In case there is none: what is the most efficient way of accelerating the convolution with a still reasonable complexity of implementation and maintenance? Shall we use JNI, shaders or something completely different?</li>
  </ul>