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From: envbvs@epb2.lbl.gov (Brian V. Smith)
Newsgroups: comp.windows.x
Subject: XCopyPlane() on color Vaxstation 2000
Keywords: Is it broken?
Message-ID: <4089@helios.ee.lbl.gov>
Date: 31 Oct 89 18:55:11 GMT
Sender: usenet@helios.ee.lbl.gov
Reply-To: envbvs@epb2.lbl.gov (Brian V. Smith)
Organization: Lawrence Berkeley Laboratory
Lines: 85

I have a simple application that just displays a bitmap file on a window.
After calling XReadBitmapFile to get the data in a Pixmap, I use 
XCopyPlane to copy it into the window.
 
I call XCopyPlane AFTER RECEIVING AN EXPOSE EVENT ON THE WINDOW.
This works fine on monochrome Vaxstation II and 2000's, but not on
our color (4-plane) machines.  I made sure that the foreground/background
pixel values were good but to no avail.
Help!? 

_____________________________________
Brian V. Smith    (bvsmith@lbl.gov)
Lawrence Berkeley Laboratory
I don't speak for LBL, these non-opinions are all mine.


Here is the relevant part of the program:

------------------------------  cut  here ------------------------------
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>

Display *disp;
int     width, height;
Pixmap  picture;
Window  win = (Window) 0;
GC      gc;
XGCValues gcval;

main(ac, av)
int ac;
char *av[];
        {
        char            *file;
        XExposeEvent    ev;
        if (ac < 2)
                file="-";       /* standard input */
        else
                file = av[1];
        if ((disp=XOpenDisplay("")) == NULL)
                {
                fprintf(stderr, "Couldn't open DISPLAY\n");
                exit(1);
                }
        if (XReadBitmapFile(disp,RootWindow(disp,0),file,
                &width,&height,&picture,NULL, NULL) != BitmapSuccess)
                {
                fprintf(stderr, "Bad bitmap file: %s\n", file);
                exit(1);
                }

        gcval.foreground=BlackPixel(disp,0);
        gcval.background=WhitePixel(disp,0);
        gcval.line_width = 1;
        gcval.function = GXcopy;
        if ((gc = XCreateGC(disp,RootWindow(disp,0),
                        GCFunction|GCLineWidth|
                        GCForeground|GCBackground,&gcval))
                    ==False)
                {
                fprintf(stderr,"Error in creating GC\n");
                exit(1);
                }
        win = XCreateSimpleWindow(disp,RootWindow(disp,0), 0, 0, width,
height, 0,
                        BlackPixel(disp,0), WhitePixel(disp,0));
        XStoreName(disp, win, "Xbitmap");
        XMapRaised(disp,win);

        XSelectInput(disp, win, ExposureMask|ButtonPressMask|KeyPressMask);
        for (;;)
                {
                XNextEvent(disp, &ev);
                if (ev.type == Expose || ev.type== GraphicsExpose)
                        drawPicture(0, ev.y, width, ev.height);
                }
        }

drawPicture(x, y, w, h)
        {
        XCopyPlane(disp, picture, win, gc, 0, y, w, h, 0, y, (unsigned
long) 1);
        XFlush(disp);
        }