On 02/16/2016 06:14 PM, Chris Feng wrote:
>> Can we set this parameter after the corresponding X window has been
>> displayed? Or should this new frame parameter only make sense in
>> make-frame calls?
> 
> Modifying such a parameter makes little sense I think.  IIRC some
> existing frame parameters just work this way.

Ok; thanks. So if I understand correctly, the implementation would look like this:

* add a frame parameter to frame_parms in frame.c, say "chromeless"
* add an x_set_chromeless slot in each of frame_parm_handler x_frame_parm_handlers[], frame_parm_handler w32_frame_parm_handlers[], frame_parm_handler ns_frame_parm_handlers[]; for the last two point to 0 for now; for the first one point to a new function x_set_chromeless.
* In x-create-frame, add something like
    x_default_parameter (f, parms, Qchromeless, Qnil,
                         "chromeless", "Chromeless", RES_TYPE_BOOLEAN);

Am I missing steps (in terms of implementation)?

Thanks for your help!
Clément.