Anybody of GTk's Team ? or More about Shapes

["José Miguel R. Barrientos" <jmiguel ceselsa es>]

At risk to get people bored, 

I think that with minimal modifications it's possible to combine more than one
mask in the shape of a container.
This code do it. Specially the function my_shape_combine_mask() it's easy to
include in Gdk (I think).

See the code please (better execute it :), because I'm not be able to express
myself in english ...


Thanx a lot,


                - José Miguel

#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <X11/extensions/shape.h>
#include <gtk/gtk.h>
#include <gdk/gdkx.h>

/* */
int main(int argc, char *argv[]) {
	GtkWidget	*toplevel = NULL,
				*area = NULL,
				*pixm1 = NULL,
				*pixm2 = NULL;
	GtkStyle	*style;
	GdkPixmap	*pdata = NULL;
	GdkBitmap	*mask;
	GdkWindow	*rootw;
	GdkWindowPrivate	*privw;

	gtk_init(&argc, &argv);

	rootw = gdk_window_foreign_new(GDK_ROOT_WINDOW());

	gtk_widget_show(toplevel = gtk_window_new(GTK_WINDOW_TOPLEVEL));
	gtk_widget_set_name(toplevel, "- P R U E B A S -");
	gtk_signal_connect(GTK_OBJECT(toplevel), "destroy",
GTK_SIGNAL_FUNC(gtk_main_quit), NULL);
	gtk_signal_connect(GTK_OBJECT(toplevel), "delete_event",
GTK_SIGNAL_FUNC(gtk_false), NULL);

	gtk_widget_show(area = gtk_fixed_new());
	gtk_container_add(GTK_CONTAINER(toplevel), area);	

	style = gtk_widget_get_default_style();
	pdata = gdk_pixmap_create_from_xpm(rootw, &mask, &style->bg[GTK_STATE_NORMAL],
			"../../gtk/kiss/Modeller.xpm");
	gtk_widget_show(pixm1 = gtk_pixmap_new(pdata, mask));
	gtk_fixed_put(GTK_FIXED(area), pixm1, 10, 10);
	
	/* Shape of first child, Normal Method */
	gdk_window_shape_combine_mask(area->window, mask, 10, 10);

	/* I want more pixmaps in same container */
	pdata = gdk_pixmap_create_from_xpm(rootw, &mask, &style->bg[GTK_STATE_NORMAL],
			"../../gtk/kiss/3DRings.xpm");
	gtk_widget_show(pixm2 = gtk_pixmap_new(pdata, mask));
	gtk_fixed_put(GTK_FIXED(area), pixm2, 40, 40);

	gtk_widget_realize(area);
	gdk_window_set_cursor(area->window, gdk_cursor_new(GDK_HAND2));
	/* Merge Shape of second pixmap */
	my_shape_combine_mask(area->window, mask, 40, 40);

	gtk_main();
	return(0);
}

/*
 * It's not safe to use Gdk internals
 * */
int my_shape_combine_mask(GdkWindow *window, GdkBitmap *mask, gint x, gint y) {
	GdkWindowPrivate	*window_private;
	Pixmap	pixmap;
	
	g_return_if_fail(window != NULL);
	
	window_private = (GdkWindowPrivate*)window;
	if(window_private->destroyed)
		return;
	
	/* if(gdk_window_have_shape_ext()) { */
		if(mask) {
			GdkWindowPrivate *pixmap_private;
		
			pixmap_private =(GdkWindowPrivate*) mask;
			pixmap =(Pixmap) pixmap_private->xwindow;
		} else {
			x = 0;
			y = 0;
			pixmap = None;
		}
			
		XShapeCombineMask(window_private->xdisplay, window_private->xwindow,
			 ShapeBounding, x, y, pixmap, ShapeUnion);
	/* } */
}