private void mapAbsoluteToRelative(float[] destPoints, float[] srcPoints, int numPoints) {
    for (int i = 0; i < numPoints; i++) {
      destPoints[i * 2 + 0] = (srcPoints[i * 2 + 0] - mImageBounds.left) / mImageBounds.width();
      destPoints[i * 2 + 1] = (srcPoints[i * 2 + 1] - mImageBounds.top) / mImageBounds.height();
    }
  }
Maps array of 2D points from view-absolute to image-relative coordinates. This does NOT take
into account the zoomable transformation. Points are represented by a float array of [x0, y0,
x1, y1, ...].

@param destPoints destination array (may be the same as source array)
@param srcPoints source array
@param numPoints number of points to map
samples/zoomable/src/main/java/com/facebook/samples/zoomable/DefaultZoomableController.java