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Conference noted::motif

Title:"OSF/Motif" is a trademark
Notice:MOTIF kit note in 7.*
Moderator:GOOEY::GRASS
Created:Mon Aug 07 1989
Last Modified:Thu Jun 05 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:5973
Total number of notes:24620

5961.0. "PseudoColor inside TrueColor - How?" by TAV02::AMIT (Amit Margalit) Sun May 04 1997 06:10

Hello!

I have a X11 question rather than Motif:

How can I use a 256-entry r/w colormap in TrueColor? I know there are apps
that do this (SoftWindows and xv). I tried to use the following code, but
it keeps crashing with BadMatch:

Any help would be appreciated.

	Amit

#include <malloc.h>
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>

void main(void)
{
  Display *disp;
  Colormap cmap;
  Window win;
  XVisualInfo vinfo[100];
  XSetWindowAttributes attr;
  Status stat;

  disp = XOpenDisplay("doronx:0.0");
  stat = XMatchVisualInfo(disp,0,8,PseudoColor,vinfo);
  if(stat==0)
  {
    XCloseDisplay(disp);
    exit(0);
  }
  XSync(disp,False);
  win = XCreateWindow(disp,
                DefaultRootWindow(disp),
                0,0,100,76,             /* x,y,w,h */
                0,                      /* border */
                8,                      /* depth */
                InputOutput,            /* input class */
                vinfo[0].visual,        /* pseudocolor visual */
                0L,NULL);               /* attribs */
  XSync(disp,False);
  if(win==0)
  {
    XCloseDisplay(disp);
    exit(0);
  }

  cmap = XCreateColormap(disp,DefaultRootWindow(disp),
                vinfo[0].visual,AllocAll);
  if(cmap == 0)
  {
    XCloseDisplay(disp);
    exit(0);
  }
  XSync(disp,False);

  XSetWindowColormap(disp,win,cmap);
  /* Main thing */
  XSync(disp,False);
  XDestroyWindow(disp,win);
  XCloseDisplay(disp);
}
T.RTitleUserPersonal
Name		DateLines
5961.1I figured it out, so I decided to put it here.TAV02::AMITAmit MargalitMon May 05 1997 04:1471
Hi!

Re: .0

I was getting BadMatch because when a window is a different depth than its
parent, it must be created with a matching colormap AND a border_pixel value.
I was creating the colormap after the window which is wrong. Here is a correct
version:

#include <malloc.h>
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>

void main(void)
{
  Display *disp;
  Colormap cmap;
  Window win;
  XVisualInfo vinfo[10];
  XSetWindowAttributes attr;
  Status stat;
  int i;
  XColor xclr[256];

  disp = XOpenDisplay("doronx:0.0");

  stat = XMatchVisualInfo(disp,0,8,PseudoColor,vinfo);
  if(stat==0)
  {
    XCloseDisplay(disp);
    exit(0);
  }

  cmap=XCreateColormap(disp,DefaultRootWindow(disp),vinfo[0].visual,AllocAll);
  if(cmap == 0)
  {
    XCloseDisplay(disp);
    exit(0);
  }
  for(i=0;i<256;i++)
  {
    xclr[i].red=i*256;    xclr[i].green=i*128;
    xclr[i].blue=~(i*256);
    xclr[i].flags=DoRed|DoGreen|DoBlue;
    xclr[i].pixel=i;
  }
  XStoreColors(disp,cmap,xclr,256);

  attr.border_pixel=BlackPixel(disp,0);
  attr.colormap=cmap;
  win = XCreateWindow(disp,
                DefaultRootWindow(disp),
                0,0,100,76,             /* x,y,w,h */
                0,8,                    /* border,depth */
                InputOutput,            /* input class */
                vinfo[0].visual,        /* pseudocolor visual */
                CWBorderPixel|CWColormap,&attr);        /* attribs */
  if(win==0)
  {
    XCloseDisplay(disp);
    exit(0);
  }
  XMapWindow(disp,win); /* whop! we're on screen! */
  XSync(disp,False);

  scanf("%d",&i);       /* just to wait until you press something */

  XDestroyWindow(disp,win);     /* that's all folks! */
  XCloseDisplay(disp);
}