Re: help on plotting the image from a webcam!!!

[Chris Nystrom <ccn olenska hn org>]

On Thu, 23 May 2002, simith nambiar wrote:

>          iam newbie for linux as well as gtk, and i
> wanted to develop an application (VOIP) for my
> project.
> I have a webcam from which i would be grabbing frames 
> ,so can i plot the data on a drawing board or any
> componenet of gtk, In case it is possible could u plz
> tell me what to use and how to do it.

Here is a small demo of how to display an image using Gtk+ 1.x and Imlib.
I ended up using gdk-pixbuf instead, but do not have a handy demo program
of that.

Chris

--
/*
 *
 *  show-it.c
 *
 */

#include <stdio.h>
#include <gtk/gtk.h>
#include <gdk_imlib.h>

gint
delete_window(GtkWidget *widget)
{
  return(FALSE);
}

gint
destroy_window(GtkWidget *window, gpointer data)
{
  gtk_main_quit();
  return(FALSE);
}

int main(int argc, char *argv[])
{
  GtkWidget *window;
  GtkWidget *event_box;
  GtkWidget *gtk_pixmap;
  GdkPixmap *pixmap;
  GdkImlibImage *image;
  gint width, height;

  if (argc<=1)
  {
    printf("Usage:\n %s image_file\n",argv[0]);
    exit(1);
  }

  gtk_init(&argc, &argv);

  gdk_imlib_init();
  gtk_widget_push_visual(gdk_imlib_get_visual());
  gtk_widget_push_colormap(gdk_imlib_get_colormap());

  image = gdk_imlib_load_image(argv[1]);

  width = image->rgb_width;
  height = image -> rgb_height;

  gdk_imlib_render(image, width, height);
  pixmap = gdk_imlib_move_image(image);

  event_box = gtk_event_box_new();

  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

  gtk_pixmap = gtk_pixmap_new(pixmap, NULL);

  gtk_window_set_default_size(GTK_WINDOW(window), 700, 700);

  gtk_signal_connect (GTK_OBJECT (window), "delete_event",
    GTK_SIGNAL_FUNC (delete_window), NULL);

  gtk_signal_connect (GTK_OBJECT (window), "destroy",
    GTK_SIGNAL_FUNC (destroy_window), NULL);

  gtk_container_add (GTK_CONTAINER(event_box), gtk_pixmap);
  gtk_container_add (GTK_CONTAINER(window), event_box);

  gtk_widget_show (gtk_pixmap);
  gtk_widget_show (event_box);
  gtk_widget_show(window);

  gtk_main();

  return 0;
}