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From: envbvs@epb2.lbl.gov (Brian V. Smith)
Newsgroups: comp.windows.x
Subject: XCopyPlane() on color Vaxstation 2000s
Keywords: broken?
Message-ID: <4088@helios.ee.lbl.gov>
Date: 31 Oct 89 18:03:46 GMT
Sender: usenet@helios.ee.lbl.gov
Reply-To: envbvs@epb2.lbl.gov (Brian V. Smith)
Organization: Lawrence Berkeley Laboratory
Lines: 68


Ok, I give up.  Is XCopyPlane() broken on color Vaxstation 2000s (4-plane)?

I have a simple client which just displays a bitmap file in a window.
I call XReadBitmapFile() and create a GC with BlackPixel and WhitePixel
as foreground and background respectively.  Then, AFTER RECEIVING AN EXPOSE
EVENT, I just use XCopyPlane to display the exposed part of the pixmap.

It works fine on our monochrome Vaxstation 2000s, but not on the color.
Here is the important part of the program:

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

main()
	{
        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 = copyfunc;
        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, 1,
                        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);
        }


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