Re: unable to set black text color for cdk

[daggs]

> Sent: Wednesday, April 01, 2015 at 3:54 AM
> From: "Thomas Dickey" <address@hidden>
> To: daggs <address@hidden>
> Cc: address@hidden
> Subject: Re: unable to set black text color for cdk
>
> On Mon, Mar 30, 2015 at 12:31:33PM +0200, daggs wrote:
> > Greetings,
> > 
> > I'm trying to setup a text in black color and it ends up in gray, looping
> > over the first 49 colors (with and without bold) didn't returned any label
> > with black text color, is it possible that there is no black color text in
> > cdk?
> 
> hmm - it's more complicated than that - partly Cdk and partly (n)curses.
> 
> The initCDKColor function is probably what you're looking at, since
> it is the only place that calls init_pair().  It's a little odd (I think)
> because it maps the colors 0-7 in this order:
> 
>       COLOR_WHITE, COLOR_RED, COLOR_GREEN,
>       COLOR_YELLOW, COLOR_BLUE, COLOR_MAGENTA,
>       COLOR_CYAN, COLOR_BLACK
> 
> If the terminal supports more than 8, cdk uses only 8.  You can always
> override that by calling init_pair() in your application.
> 
> Normally in curses, black is zero.  That raises a point, i.e., that color
> pair 0 is special in curses (no colors as such).  So cdk does not use that.
> 
> In any case, since black is last, you would see black text on pairs 57-64,
> due to the way the loops are ordered.

Greeting Thomas,

my issue in fact is with the (0,0) pair, e.g. black text over black background.
you might ask why one need such option, well using black background color ober 
a background image gives me a transparency affect.
for example, I want to create a background image that has a white square in it 
and write inside it text.

as I see that all the other same combinations works ((n,n) for n:=1->7) and it 
works when using special esc chars I can only assume that it is a either 
ncurses or cdk limitation.

Dagg.