code: private static void checkFinalImageBounds(Bitmap source, int x, int y, int width, int height) {
      Preconditions.checkArgument(
          x + width <= source.getWidth(),
          "x + width must be <= bitmap.width()");
      Preconditions.checkArgument(
          y + height <= source.getHeight(),
          "y + height must be <= bitmap.height()");
    }
docs: Common code for checking that x + width and y + height are within image bounds
  
  @param source the source Bitmap
  @param x starting x coordinate of source image subset
  @param y starting y coordinate of source image subset
  @param width width of the source image subset
  @param height height of the source image subset