RE: widget appearance getting corrupted

[Kumar Siddharth <kumarsiddharth tataelxsi co in>]

Hi Pritesh,

This is the program which works the way you expect it i.e it will show only
the image(Shaped Widget). I got it running by modifying the GTK example.
Hope it works. Note that you have to use 255 as Threshold Alpha and
gtk_pixmap_new() is outdated(i think so).

Also, you should get assertion for the following line as the image type is
not "pixmap" from file.
> > pixbuf = gtk_image_get_pixbuf(GTK_WIDGET(image));



#include<stdlib.h>
#include <gtk/gtk.h>
#include <gdk-pixbuf/gdk-pixbuf.h>

/* When invoked (via signal delete_event), terminates the application */
gint close_application( GtkWidget *widget,
                        GdkEvent  *event,
                        gpointer   data )
{
    gtk_main_quit();
    return(FALSE);
}

int main (int argc,
          char *argv[] )
{
    /* GtkWidget is the storage type for widgets */
    GtkWidget *window, *fixed;
    GdkPixmap *gdk_pixmap;

//SID
        GtkWidget *s_image;
        GdkPixbuf *s_pixbuf;
        GdkBitmap *s_alpha;
//END

    /* Create the main window, and attach delete_event signal to terminate
     * the application.  Note that the main window will not have a titlebar
     * since we're making it a popup. */
    gtk_init (&argc, &argv);
    window = gtk_window_new (GTK_WINDOW_POPUP);
    g_signal_connect (G_OBJECT (window), "delete_event",
                      G_CALLBACK (close_application), NULL);
    gtk_widget_show (window);


//SID
        g_print("\nSetting gtk_image_new_from_file()...\n");
        s_image = gtk_image_new_from_file("my.png");

//GDK-PIXBUF
        g_print("\nSetting gdk_pixbuf_new_from_file()...\n");
        s_pixbuf = gdk_pixbuf_new_from_file("my.png", NULL);
        s_alpha = (GdkBitmap *)malloc(160*160*sizeof(GdkBitmap));
        g_print("\nCalling gdk_pixbuf_render_threshold_alpha()...\n");
        gdk_pixbuf_render_pixmap_and_mask(s_pixbuf, &gdk_pixmap, &s_alpha,255);
        g_print("\nCalled gdk_pixbuf_render_threshold_alpha()...\n");


        gtk_widget_show(s_image);

    /* To display the pixmap, we use a fixed widget to place the pixmap */
    fixed = gtk_fixed_new ();
    gtk_widget_set_size_request (fixed, 200, 200);
        gtk_fixed_put (GTK_FIXED (fixed), s_image, 0, 0);
    gtk_container_add (GTK_CONTAINER (window), fixed);
    gtk_widget_show (fixed);

    /* This masks out everything except for the image itself */
        g_print("\nCalling gtk_widget_shape_combine_mask()...\n");
    gtk_widget_shape_combine_mask (window, s_alpha, 0, 0);
        g_print("\nCalled gdk_widget_shape_combine_mask()...\n");
    /* show the window */
    gtk_widget_show (window);
    gtk_main ();

    return 0;
}


Regards,
Siddharth
TATA Elxsi


-----Original Message-----
From: gtk-app-devel-list-bounces gnome org
[mailto:gtk-app-devel-list-bounces gnome org]On Behalf Of Pritesh Kumar
Sent: Wednesday, January 24, 2007 7:30 PM
To: gtk-app-devel-list gnome org
Subject: widget appearance getting corrupted


here is my code snippet for displaying a shaped widget .




void create_playerbar()
{

     GtkWidget *image ,*window, *pixwid;
    GdkPixbuf  *pixbuf ;
    GdkPixmap *pixmap;
      GdkBitmap  *bitmap;
      int alpha;
     alpha = 32;
      window = gtk_window_new(GTK_WINDOW_POPUP);

       image = gtk_image_new_from_file("/xyz.png");
      pixbuf = gtk_image_get_pixbuf(GTK_WIDGET(image));
      gdk_pixbuf_render_pixmap_and_mask(pixbuf, &pixmap, &bitmap,alpha);
     pixwid = gtk_pixmap_new(pixmap,bitmap);
     gtk_container_add(GTK_CONTAINER(window),pixwid);
    gtk_widget_shape_combine_mask(window,bitmap,0,0);
   gtk_window_set_transient_for(GTK_WINDOW(window), GTK_WINDOW(topwindow));




}

but whenever i do gtk_widget_show_all(GTK_WIDGET(window)) ,     corrupted
widget comes up on the screen. The appearance of the png image inside the
window (widget)
 gets corrupted . Every time it shows up some different color for the
widget.  However if i repeat closing the application and opening it for 3-4
times , then the widget shows up correctly with proper image
appearance(maintaining the color appearance of png image).

but this problem does not occur on fc3  .  it occurs on fc6  frequently.

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