Kinda-not-really? Wayland has wl_region objects and wl_surface_set_input_region but wl_region only has axis-aligned rectangles. you'd end up approximating the circle (or whatever shape) as a union of horizontal rect slices, rather than a pixmap. you can't just hand over a pixmap mask, you have to decompose the shape into rects yourself.
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Kinda-not-really? Wayland has wl_region objects and wl_surface_set_input_region but wl_region only has axis-aligned rectangles. you'd end up approximating the circle (or whatever shape) as a union of horizontal rect slices, rather than a pixmap. you can't just hand over a pixmap mask, you have to decompose the shape into rects yourself.