wl_pointer::set_cursor surface viewport is ignored

[iciclejj]

Hyprland version

Hyprland 0.56.0 built from branch main at commit 6d43ce8

Is this a regression?

Don't know

What's the bug?

Custom cursor surfaces (set using the wl_pointer::set_cursor request) ignore wp_viewport viewports.

Here I have a buffer with 4x the width and height of the actual cursor image, and a viewport set exactly to the size of the cursor image. The rest of the buffer is filled with random values:

Same code on Sway:

Reproduction steps

1. Set a cursor surface with wl_pointer::set_cursor
2. Viewport it to a smaller size with wp_viewport::set_source
3. Entire buffer is still displayed, despite the viewport

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[vaxerski]

wtf why would you do this xD

#15883

[iciclejj]

Maybe there is a more optimal way, but in my case it was to resize or rescale the cursor without needing to either 1. destroy/recreate a new wl_buffer every time or 2. make sure the entire buffer gets cleared, and then also have the compositor potentially keep blitting the entire buffer all the time, even if only part of it actually contains the cursor.

[Cloudef]

I wonder if you are hitting similar issue as here? #15874 What happens if you reattach buffer to the surface after viewport changes?