#include <X11/Xutil.h>
#include <X11/extensions/Xrender.h>
#include <stdio.h>

static Display *display;

int main() {
    XVisualInfo xvi;
    XVisualInfo *list;
    XRenderPictFormat *format;
    int nitems, i;

    display = XOpenDisplay(NULL);

    list = XGetVisualInfo(display, VisualNoMask, &xvi, &nitems);

    for (i = 0; i < nitems; i++) {
        const XVisualInfo *v = &list[i];
        printf("id=0x%lx depth=%u r=0x%lx g=0x%lx b=0x%lx ",
            v->visualid, v->depth, v->red_mask, v->green_mask, v->blue_mask);
        format = XRenderFindVisualFormat(display, v->visual);
        if (format && format->type == PictTypeDirect) {
            printf("a=0x%x\n", format->direct.alphaMask << format->direct.alpha);
        } else {
            printf("; no xrender\n");
        }
    }

    XFree(list);
    XCloseDisplay(display);
    return 0;
}