in the pool, a new one will be
 allocated. </p>

 <p> Because this method erases all pixels in the <a href="http://d.android.com/reference/android/graphics/Bitmap.html?is-external=true" title="class or interface in android.graphics"><code>Bitmap</code></a>, this method is slightly slower
 than <a href="../../../../../../com/bumptech/glide/load/engine/bitmap_recycle/BitmapPool.html#getDirty-int-int-android.graphics.Bitmap.Config-"><code>BitmapPool.getDirty(int, int, android.graphics.Bitmap.Config)</code></a>