visual and PictFormat related question

[Eirik Byrkjeflot Anonsen]

Alexei Babich <a.babich at rez.ru> writes:

> Good afternoon.
>
> I tryed to deal with colormap, but probably I got wrong.
>
> Description: We have two visuals (as xdpyinfo says): default, 0x21 (TrueColor, depth == 24 planes); 0x39 (TrueColor, depth == 32 planes)
>
> I tryed this:
>
> {
>        Window win;
>        Visual *argb_visual;
>
>        {       //search visual suitable for PictStandardARGB32
>                //derived from xdpyinfo source
>                XVisualInfo viproto;            /* fill in for getting info */
>                XVisualInfo *vip;                       /* returned info */
>                int nvi = 0;
>                viproto.depth = 32;
>                vip = XGetVisualInfo (display, VisualDepthMask, &viproto, &nvi);
>                if(nvi <1) {
>                        exit(EXIT_FAILURE);
>                }
>                if(nvi){
>                        argb_visual = vip->visual;              //visual for 32-planes
>                        XFree(vip);
>                }
>        }
>
>        // create window
>        // default depth of root window is 24
>
>        win = XCreateWindow(display, DefaultRootWindow(display), 20,30,20,30,0,32 /*depth*/,InputOutput,argb_visual,0,NULL);
>        // when I try depth 24, creating window also fails.
>        // This depth (32) and visual combinations look legal, because manual tells, that "For class InputOutput, the visual type and depth must be a combination supported for the screen, or a BadMatch error results".
> }
>
> Following your advice, I tryed colormap before creating window, like this:
> {
>        Colormap cmap;
>        //AllocNone is the only choice for visual type of TrueColor
>        cmap = XCreateColormap(display, DefaultRootWindow(display), argb_visual,AllocNone);
> }
>
> But creating window still fails.
> I suppose I could get your letter wrong. If not, have you please other ideas how to create windows compatible with PictStandardARGB32 ?

Just to be sure: You did pass the colormap to the XCreateWindow call?
(Adding the colormap to the "attributes" parameter and setting the
CWColorMap bit in "valuemask")

eirik