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From: chapman@lll-crg.llnl.gov (Carol Chapman)
Newsgroups: comp.windows.x,ba.windows.x,llnl.x
Subject: need help with garbaged pixmap--already read FAQ
Summary: works fine on my workstation, doesn't on others
Keywords: X11R4, Motif 1.1, VMS
Message-ID: <96982@lll-winken.LLNL.GOV>
Date: 9 May 91 01:35:41 GMT
Sender: usenet@lll-winken.LLNL.GOV
Followup-To: comp.windows.x
Organization: Livermore National Laboratory
Lines: 83
Nntp-Posting-Host: lll-crg.llnl.gov

I am having a problem displaying rotated text as a pixmap.  All works
just fine on my workstation, but when I display my program on other work-
stations (same architecture -- DEC 3100) the pixmap shows up as solid
black.  I read the FAQ re. garbaged pixmaps by Dave Lemke, and as far as
I can tell, the enclosed code (which was written by Chris Craig) follows
all of Lemke's suggestions.  I really don't want to force the background
to be a specific color, so I'm hoping one of you netters can tell me
what's wrong and how to fix it.

thanx in advance for any and all suggestions,
carol

P.S.  My workstation is running VMS 5.3 while the others are running
VMS 5.4, if that makes a difference.

/**********************************************************************/

static void Rotate(dpy, d, gc, t)
Display *dpy;
Drawable d;
GC gc;
AtText *t;
{
    Pixmap pixmap;
    XImage *image;
    XWindowAttributes wa;
    GC localgc;
    char *data;
    int i,j;
    unsigned long foreground;
    unsigned long background;
    int w,h;  /* width, height */

    .
    .
    .
    
    localgc = XCreateGC(dpy, d, 0L, NULL);
    XCopyGC(dpy, gc, GCFunction | GCPlaneMask | GCForeground | GCBackground |
	           GCSubwindowMode | GCFillStyle | GCTile,  localgc);
    
    /*
     * create a pixmap the size of the unrotated text
     * clear the pixmap to the background color
     * draw the text into it unrotated
     * get the text as an unrotated image
     * Since everything is unrotated, use w and h backwards
     */
    pixmap = XCreatePixmap(dpy, d, h, w, wa.depth);
    foreground = gc->values.foreground;
    background = gc->values.background;
    XSetForeground(dpy,localgc,background);
    XFillRectangle(dpy,pixmap, localgc, 0,0,h,w);
    XSetForeground(dpy,localgc,foreground);
    Draw(dpy, pixmap, localgc, t->parsed, 0,t->parsed->ascent);
    image = XGetImage(dpy, pixmap, 0,0, h, w, AllPlanes, XYPixmap);
    
    /*
     * allocate enough memory for the rotated image
     * create the image.
     */
    data = (char *)malloc(wa.depth * h * (w + 7)/8);
    t->rotated_image = XCreateImage(dpy, wa.visual, wa.depth, XYPixmap,0, data,
				    w, h, 8, (w+7)/8);

    /*
     * rotate the image
     */
    for(i=0; i < h; i++)
	for(j=0; j < w; j++)
	    XPutPixel(t->rotated_image, j, h-i-1,
		      XGetPixel(image, i,j));

    t->rotated_depth = wa.depth;

    XDestroyImage(image);
    XFreePixmap(dpy, pixmap);
    XFreeGC(dpy, localgc);
}
Carol Chapman                                        Tel. (415) 423-7876
Livermore National Laboratory                NEW -->  chapman@.llnl.gov
P. O. Box 808, L-572            "Are you in charge here?"
Livermore, CA  94550            "No, but I'm full of ideas!"  -- Dr. Who