Makes pixels in window outside shape_region be transparent,
so that the window may be nonrectangular.
If shape_region is NULL, the shape will be unset, so the whole
window will be opaque again. offset_x and offset_y are ignored
if shape_region is NULL.
On the X11 platform, this uses an X server extension which is
widely available on most common platforms, but not available on
very old X servers, and occasionally the implementation will be
buggy. On servers without the shape extension, this function
will do nothing.
This function works on both toplevel and child windows.
Makes pixels in window outside shape_region be transparent, so that the window may be nonrectangular. If shape_region is NULL, the shape will be unset, so the whole window will be opaque again. offset_x and offset_y are ignored if shape_region is NULL. On the X11 platform, this uses an X server extension which is widely available on most common platforms, but not available on very old X servers, and occasionally the implementation will be buggy. On servers without the shape extension, this function will do nothing. This function works on both toplevel and child windows.