public CloseableReference<Bitmap> createBitmap(
      Bitmap source, int x, int y, int width, int height) {
    return createBitmap(source, x, y, width, height, null);
  }
Creates a bitmap from the specified subset of the source bitmap. It is initialized with the
same density as the original bitmap.

@param source The bitmap we are subsetting
@param x The x coordinate of the first pixel in source
@param y The y coordinate of the first pixel in source
@param width The number of pixels in each row
@param height The number of rows
@return a reference to the bitmap
@throws IllegalArgumentException if the x, y, width, height values are outside of the
    dimensions of the source bitmap, or width is <= 0, or height is <= 0
@throws TooManyBitmapsException if the pool is full
@throws java.lang.OutOfMemoryError if the Bitmap cannot be allocated
imagepipeline-base/src/main/java/com/facebook/imagepipeline/bitmaps/PlatformBitmapFactory.java