["hhMockup" is an enhanced version of the stack I used to produce the demos for
my LCGlobal talk "Perspective and affine transformations of images" in Nov 2017.]
The stack contains a *very fast* version of the perspective image-transformation
given in Raspberry Pi stacks collection #85 (pure LC Script):
image filters. Everything else, especially the computation of the "perspective
matrix" and all the display is still LC Script.
You can scale, skew, translate and rotate in single or combined actions and
perspective transform images up to screen size.
*** The perspective transform is also used to show images in a given MOCKUP frame.
There is also demo of running a gif (EM's jockey) in such mockup frames.
There are still more details to explore, e.g. expanding the transform of the
control polygon (and by that the image) horizontally, vertically or both.