[Glamor] XSetDashes

[Pasqual Castellón]

Dear Sirs,

I have a problem with xlib output refering to XSetDashes. The dotted 
lines using 2 array length is working (eg 1,1) but when I use a longer 
array length it does not work (eg 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1). Then 
the line is showed as dash-dot and not as dot.

It used to work with CentOS but now the problem appeared after 
installilng fedora 26. Any clue?

I think this problem is possibly related to glamor module using NOUVEAU.

This is a sample code:

#include <X11/Xlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define     DOTOK_LIST_LEN               2
#define     DOTERR_LIST_LEN             16
#define     DASH_LIST_LEN                2
#define     DASH_DOT_LIST_LEN            4

int main(void) {
    Display *d;
    Window w;
    XEvent e;
    GC     gc;
    int s;

    static char dot_ok[]={1,1};
    static char dot_err[]={1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1};
    static char dash[]={8,8};
    static char dash_dot[]={13,1,1,1};
    static char *dash_list[]={
       dot_ok,dot_err,dash,dash_dot,NULL
    };
    static int dash_list_length[]={
       DOTOK_LIST_LEN,
       DOTERR_LIST_LEN,
       DASH_LIST_LEN,
       DASH_DOT_LIST_LEN
    };

    d = XOpenDisplay(NULL);
    if (d == NULL) {
       fprintf(stderr, "Cannot open display\n");
       exit(1);
    }

    s = DefaultScreen(d);
    w = XCreateSimpleWindow(d, RootWindow(d, s), 10, 10, 300, 300, 1,
                            BlackPixel(d, s), WhitePixel(d, s));
    XSelectInput(d, w, ExposureMask | KeyPressMask);
    XMapWindow(d, w);

    gc = DefaultGC(d, s);

    while (1) {
       XNextEvent(d, &e);
       if (e.type == Expose) {
          XGCValues     values;
          int           i=0;

          values.line_style = LineOnOffDash;
          XChangeGC(d,gc,GCLineStyle,&values);

          while (dash_list[i]) {
             int step = 10*i;

XSetDashes(d,gc,0,dash_list[i],dash_list_length[i]);

             XDrawLine(d,w,gc,10+step,10,10+step,290);

             i++;
          }
       }
       if (e.type == KeyPress)
          break;
    }

    XCloseDisplay(d);
    return 0;
}

-- 
*Pasqual Castellón*
Vicepresident - Software Division
skype: pasqual.cadt

CADT Software & Drafting, S.L.
Sant Cugat del Vallès - Barcelona
http://www.cadt.com

Follow us on:
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-- 
*Pasqual Castellón*
Vicepresident - Software Division
skype: pasqual.cadt

CADT Software & Drafting, S.L.
Sant Cugat del Vallès - Barcelona
http://www.cadt.com

Follow us on:
Facebook <http://www.facebook.com/cadtlacedesign>
Twitter <http://www.twitter.com/cadt_sd>
Instagram <http://www.instagram.com/cadt_sd>

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