Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!elroy.jpl.nasa.gov!decwrl!sgi!shinobu!odin!news
From: hajadi@goofy.csd.sgi.com (Ivan Hajadi)
Newsgroups: comp.windows.x
Subject: XGetImage, BadMatch
Message-ID: <1991Apr17.022705.14758@odin.corp.sgi.com>
Date: 17 Apr 91 02:27:05 GMT
Sender: news@odin.corp.sgi.com (Net News)
Organization: Silicon Graphics, Inc., Mountain View, CA
Lines: 133


I copied the reflect_window program from Vol 1 O`Reilly book, and
tried to run it.  I keep getting BadMatch error.  Anyone knows
what's wrong with this program ?

Configuration : Sun3/60, 4.1.1, X11R4.

Thanks.

X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  73 (X_GetImage)
  Minor opcode of failed request:  0
  Resource id in failed request:  0x600003
  Serial number of failed request:  10
  Current serial number in output stream:  10


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

Display *disp;
int screen;

XPoint points[] =
{
  {10,10},
  {400,10},
  {400,400}
};

main()
{
        Window win1, win2;
        XSetWindowAttributes attr;
        unsigned long attrmask;

        unsigned long gcmask;
        XGCValues gcvalues;
        GC gc;

        if (!(disp = XOpenDisplay(NULL))) {
                printf("Can't open display.\n");
                exit(-1);
        }
        screen = DefaultScreen(disp);

        attrmask = CWBackPixel | CWBorderPixel;
        attr.background_pixel = WhitePixel(disp, screen);
        attr.border_pixel     = BlackPixel(disp, screen);

        win1 = XCreateWindow(disp,
                RootWindow(disp, screen),       /* parent window */
                100,100,                        /* x,y location  */
                500,500,                        /* width, height */
                3,                              /* border width  */
                CopyFromParent,                 /* window depth  */
                InputOutput,                    /* window class  */
                CopyFromParent,                 /* visual type   */
                attrmask,                       /* attribute mask */
                &attr                           /* window attributes */
                );

        win2 = XCreateWindow(disp,
                RootWindow(disp, screen),       /* parent window */
                100,100,                        /* x,y location  */
                500,500,                        /* width, height */
                3,                              /* border width  */
                CopyFromParent,                 /* window depth  */
                InputOutput,                    /* window class  */
                CopyFromParent,                 /* visual type   */
                attrmask,                       /* attribute mask */
                &attr                           /* window attributes */
                );

        gcmask = GCBackground | GCForeground;
        gcvalues.foreground = BlackPixel(disp, screen);
        gcvalues.background = WhitePixel(disp, screen);

        gc = XCreateGC(disp, win1, gcmask, &gcvalues);

        XMapWindow(disp, win1);
        XMapWindow(disp, win2);
        XFillPolygon(disp, win1, gc, points, 3, Convex, CoordModeOrigin);
        XFlush(disp);

        reflect_window(win1, win2, gc, 500, 500);


        XFlush(disp);

        printf("\nHit Enter to quit.");
        getchar();                              /* hit return to exit */

}


int reflect_window(window, newwindow, gc, w,h)
Window window;
Window newwindow;
GC gc;
unsigned int w;
unsigned int h;
{
        XImage *xi;
        unsigned long pixval1, pixval2;
        int y;
        int left_x, right_x;

        xi = XGetImage(disp, window, 0,0, w,h, AllPlanes, XYPixmap);
        printf("calculating....");

        for (left_x=0; left_x<w/2; left_x++) {
                for (y=0; y<h; y++) {
                        pixval1 = XGetPixel(xi, left_x, y);
                        right_x = w - left_x;
                        if (left_x != right_x) {
                                pixval2 = XGetPixel(xi, right_x, y);
                                XPutPixel(xi, left_x, y, pixval2);
                        }
                        XPutPixel(xi, right_x, y, pixval1);
                }
        }

        printf("putting image....");
        XPutImage(disp, newwindow, gc, xi, 0,0,0,0, w,h);
}

--

    Ivan M. Hajadi,                      Widget - any small, unspecified
    hajadi@csd.sgi.com                            gadget or device (Webster)