code: public void uploadPixels(Buffer b,
                               int x, int y, int width, int height, float alpha) {
          _uploadPixels (b, x, y, width, height, alpha);
      }
docs: Uploads a pixel buffer to the screen. Called on the JavaFX application thread.
  
  @param b Pixel data, in BYTE_BGRA_PRE format. The byte stride of the
  data is equal to width * 4.
  @param x The X offset of the pixel data on the screen
  @param y The Y offset of the pixel data on the screen
  @param width The pixel width of the data
  @param height The pixel height of the data
  @param alpha The alpha level to use to compose the data over existing
  pixels