An instance of a subclass of
graphics-ports-mixin
or a subclass of pinboard-object.
A real number.
A real number.
A real number.
A real number.
The given area of
object
is marked as not needing to be displayed. This can be useful if you want to draw that area immediately and avoid it being drawn again by the window system. By default it validates the whole rectangle, but this can be limited by passing the
&optional
arguments.
The
result
is non-
nil
if the function succeeds and
nil
if it fails (doing nothing).
Note: this function is not fully implemented on all platforms.
On Windows, it succeeds for all valid values of x , y , width and height .