Clipping fails using image mask and units != px #83
Description
Clipping gives strange results when the clip mask is an image and the units are not pixels. In the code snippet, if "px" is changed to, say, "mm" the clipping gives a very strange result.
background(1)
fill(0.5, 0.5, 0.5, 1.0)
with clip(image('circle.pdf', 20, 20)):
rect(0,0,200, 200) # Rectangle covering entire canvas```
<img width="5873" height="3211" alt="Image" src="https://github.com/user-attachments/assets/690be3bb-befe-4256-9378-3030f50a3fc9" />
[circle.pdf](https://github.com/user-attachments/files/21583838/circle.pdf)