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From: misha@huji.ac.il (Michael Pak)
Newsgroups: comp.windows.x,comp.sys.ibm.pc.rt
Subject: Xlib/GC question
Summary: Different/Unexpected behaviour
Message-ID: <misha.649954217@mush>
Date: 6 Aug 90 14:50:17 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: misha@boojum.huji.ac.il
Followup-To: comp.windows.x
Lines: 41

Hi there.


    Suppose I "XCreateSimpleWindow" (on a monochrome display) with
    foreground color set to WhitePixel(display,screen) and background
    color set to BlackPixel(display,screen).
    I then create the following GC:
    (exerpt from real code:)
 --------------
    XGCValues gcval;
  unsigned long valmask;
  valmask=(GCForeground GCBackground GCTileStipXOrigin GCTileStipYOrigin
     GCFillStyle GCTile);
  gcval.foreground = BlackPixel(display,screen);
  gcval.background = WhitePixel(display,screen);
  gcval.tile=bit_bitmap;
  gcval.ts_x_origin=0;
  gcval.ts_y_origin=0;
  gcval.fill_style=FillTiled;
  *fill_gc=XCreateGC(display,window,valmask,&gcval);
-----------------
  The question is:
     If I perform XFillRectangle(display,window,fill_gc,x,y,width,height),  what
 should I get? I mean, can it be that on different servers I'll get
  different results?

I ask it, because when I run it on our IBM RT, (ACIS 4.3, X11R4), I get
the foreground in white and the background in black, and on any other
server (all release 4), I get the opposite.

I stumbled across this strange behaviour, because there are some programs
which behave in one way on IBM RT, and another on any other server.

Thanks a lot.

******************************************
* Michael Pak                            *
* Department of Computer Science,        *
* Hebrew University of Jerusalem, Israel *
* E-Mail: misha@boojum.huji.ac.il        *
******************************************