wp_alpha_modifier_surface_v1¤
Alpha modifier object for a surface
This interface allows the client to set a factor for the alpha values on a surface, which can be used to offload such operations to the compositor. The default factor is UINT32_MAX.
This object has to be destroyed before the associated wl_surface. Once the wl_surface is destroyed, all request on this object will raise the no_surface error.
Methods:
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destroy–Destroy the alpha modifier object
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set_multiplier–Specify the alpha multiplier
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no_surface–`wl_surface` was destroyed
destroy() -> None
Destroy the alpha modifier object
This destroys the object, and is equivalent to set_multiplier with a value of UINT32_MAX, with the same double-buffered semantics as set_multiplier.
set_multiplier(factor: int) -> None
Specify the alpha multiplier
Sets the alpha multiplier for the surface. The alpha multiplier is double-buffered state, see wl_surface.commit for details.
This factor is applied in the compositor's blending space, as an additional step after the processing of per-pixel alpha values for the wl_surface. The exact meaning of the factor is thus undefined, unless the blending space is specified in a different extension.
This multiplier is applied even if the buffer attached to the wl_surface doesn't have an alpha channel; in that case an alpha value of one is used instead.
Zero means completely transparent, UINT32_MAX means completely opaque.