title: ANativeWindow_lock and AndroidBitmap_lockPixels
body: <p>Into the ndk sample folder there is 2 sample (bitmap-plasma) and (native-plasma).
  The first one write into a bitmap and then blit the bitmap on a surfaceview using AndroidBitmap_lockPixels.
  The second is a full C application that write directly to the screen using ANativeWindow_lock.</p>
  
  <p>What I'd like to do is to draw directly on a surfaceview.
  Is it possible to do that with the ndk ?</p>