The transform shader sampled in a top-left-origin pixel space while
Olive's transform semantics (and every other node) are center-origin:
rotation swung the image around the top-left corner, pushing it partly
off-frame - reading exactly like an unwanted zoom. Match the C++
transform.vert projection: position (0,0) is the frame center and
rotation/scale pivot around the anchor, so rotation and scale stay
independent user controls. GPU tests pin the 90-degree landing spot
(no smearing) and the 2x scale centroid (stays centered).
Mike-Solar
d028a45ffa