[Xcb] use of value_mask and value_list parameters

[Vincent Torri]

Hey,

I would like a precision about how to usethese 2 parameters.

Suppose that one has 5 possible flags (f0, ..., f4, with value 1<<0,... 
1<<4) and one wants to set only 2 of them (f1 and f3) to 0 and 1 
respectively.

I would do that :

CARD32 value_mask;
CARD32 value_list[2];  /* because I want to set 2 flags */

value_mask = f1 | f3;
value_list[0] = 0;
value_list[1] = 1;

is it correct ? that is, xcb will check all the set flag (f1 and f3) and 
will use the values in value_list in that precise order.

Now, another question: Suppose that I already have a value for value_mask 
(i don't know which flags are set a priori). Is there an easy way to 
declare correctly value_list and set its values as I want (I have all the 
5 possible values for f0,...f4, but I want to set only those defined in 
value_mask)

thank you

Vincent