Here is a more complete example using one of the example clutter-gtk apps:
#include <gtk/gtk.h>
#include <clutter/clutter.h>
#include <clutter-gtk/gtk-clutter-embed.h>
#include <clutter-gtk/gtk-clutter-util.h>
void funcScreenshot ()
{
ClutterActor *stage;
stage = clutter_stage_get_default ();
int width = clutter_actor_get_width (stage);
int height = clutter_actor_get_height (stage);
guchar *data = clutter_stage_read_pixels (CLUTTER_STAGE (stage),
0, 0, width, height);
guchar *p;
GdkPixbuf *pb;
for (p = data + width * height * 4; p > data; p -= 3)
*(--p) = 0xff;
pb = gdk_pixbuf_new_from_data (data, GDK_COLORSPACE_RGB, TRUE,
8, width, height, width * 4,
(GdkPixbufDestroyNotify) g_free,
NULL);
gdk_pixbuf_save (pb, "screenie.png", "png", NULL, NULL);
g_object_unref (pb);
}
typedef struct {
GtkWidget *window;
GtkWidget *popup;
GtkWidget *gtk_entry;
ClutterActor *stage;
ClutterActor *hand;
ClutterActor *clutter_entry;
} EventApp;
static void
on_gtk_entry_changed (GtkEditable *editable, EventApp *app)
{
const gchar *text = gtk_entry_get_text (GTK_ENTRY (editable));
clutter_entry_set_text (CLUTTER_ENTRY (app->clutter_entry), text);
}
static void
on_x_changed (GtkSpinButton *button, EventApp *app)
{
clutter_actor_set_rotation (app->hand, CLUTTER_X_AXIS,
gtk_spin_button_get_value (button),
0,
clutter_actor_get_height (app->hand) / 2,
0);
}
static void
on_y_changed (GtkSpinButton *button, EventApp *app)
{
clutter_actor_set_rotation (app->hand, CLUTTER_Y_AXIS,
gtk_spin_button_get_value (button),
clutter_actor_get_width (app->hand) / 2,
0,
0);
}
static void
on_z_changed (GtkSpinButton *button, EventApp *app)
{
clutter_actor_set_rotation (app->hand, CLUTTER_Z_AXIS,
gtk_spin_button_get_value (button),
clutter_actor_get_width (app->hand) / 2,
clutter_actor_get_height (app->hand) / 2,
0);
}
static void
on_opacity_changed (GtkSpinButton *button, EventApp *app)
{
clutter_actor_set_opacity (app->hand, gtk_spin_button_get_value (button));
}
/* Set the clutter colors form the current gtk theme */
static void
create_colors (EventApp *app, ClutterColor *stage, ClutterColor *text)
{
gtk_clutter_get_bg_color (app->window, GTK_STATE_NORMAL, stage);
gtk_clutter_get_text_color (app->window, GTK_STATE_NORMAL, text);
}
static gboolean
on_stage_capture (ClutterActor *actor,
ClutterEvent *event,
gpointer dummy)
{
if (event->type == CLUTTER_BUTTON_RELEASE)
{
gint x, y;
clutter_event_get_coords (event, &x, &y);
g_print ("Event captured at (%d, %d)\n", x, y);
}
return FALSE;
}
static gboolean
on_hand_button_press (ClutterActor *actor,
ClutterButtonEvent *event,
gpointer dummy)
{
g_print ("Button press on hand ('%s')\n",
g_type_name (G_OBJECT_TYPE (actor)));
return FALSE;
}
gint
main (gint argc, gchar **argv)
{
EventApp *app = g_new0 (EventApp, 1);
GtkWidget *widget, *vbox, *hbox, *button, *label, *box;
ClutterActor *actor;
GdkPixbuf *pixbuf = NULL;
guint width, height;
ClutterColor stage_color = {255, 255, 255, 255};
ClutterColor text_color = {0, 0, 0, 255};
if (gtk_clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
g_error ("Unable to initialize GtkClutter");
/* Create the inital gtk window and widgets, just like normal */
widget = gtk_window_new (GTK_WINDOW_TOPLEVEL);
app->window = widget;
gtk_window_set_title (GTK_WINDOW (widget), "Gtk-Clutter Interaction
demo");
gtk_window_set_default_size (GTK_WINDOW (widget), 800, 600);
gtk_window_set_resizable (GTK_WINDOW (widget), FALSE);
gtk_container_set_border_width (GTK_CONTAINER (widget), 12);
g_signal_connect (widget, "destroy", G_CALLBACK (gtk_main_quit), NULL);
/* Create our layout box */
vbox = gtk_vbox_new (FALSE, 12);
gtk_container_add (GTK_CONTAINER (app->window), vbox);
widget = gtk_entry_new ();
app->gtk_entry = widget;
gtk_entry_set_text (GTK_ENTRY (widget), "Enter some text");
gtk_box_pack_start (GTK_BOX (vbox), widget, FALSE, FALSE, 0);
g_signal_connect (widget, "changed", G_CALLBACK (on_gtk_entry_changed),
app);
hbox = gtk_hbox_new (FALSE, 12);
gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE, 0);
/* Set up clutter & create our stage */
create_colors (app, &stage_color, &text_color);
widget = gtk_clutter_embed_new ();
gtk_box_pack_start (GTK_BOX (hbox), widget, TRUE, TRUE, 0);
app->stage = gtk_clutter_embed_get_stage (GTK_CLUTTER_EMBED (widget));
clutter_stage_set_color (CLUTTER_STAGE (app->stage), &stage_color);
gtk_widget_set_size_request (widget, 640, 480);
g_signal_connect (app->stage, "captured-event",
G_CALLBACK (on_stage_capture),
NULL);
/* Create the main texture that the spin buttons manipulate */
pixbuf = gdk_pixbuf_new_from_file ("redhand.png", NULL);
if (pixbuf == NULL)
g_error ("Unable to load pixbuf\n");
actor = gtk_clutter_texture_new_from_pixbuf (pixbuf);
app->hand = actor;
clutter_group_add (CLUTTER_GROUP (app->stage), actor);
clutter_actor_get_size (actor, &width, &height);
clutter_actor_set_position (actor,
(CLUTTER_STAGE_WIDTH ()/2) - (width/2),
(CLUTTER_STAGE_HEIGHT ()/2) - (height/2));
clutter_actor_set_reactive (actor, TRUE);
g_signal_connect (actor, "button-press-event",
G_CALLBACK (on_hand_button_press),
NULL);
/* Setup the clutter entry */
actor = clutter_entry_new_full ("Sans 10", "", &text_color);
app->clutter_entry = actor;
clutter_group_add (CLUTTER_GROUP (app->stage), actor);
clutter_actor_set_position (actor, 0, 0);
clutter_actor_set_size (actor, 500, 20);
/* Create our adjustment widgets */
vbox = gtk_vbox_new (FALSE, 6);
gtk_box_pack_start (GTK_BOX (hbox), vbox, FALSE, FALSE, 0);
box = gtk_hbox_new (TRUE, 6);
gtk_box_pack_start (GTK_BOX (vbox), box, FALSE, TRUE, 0);
label = gtk_label_new ("Rotate x-axis");
gtk_box_pack_start (GTK_BOX (box), label, TRUE, TRUE, 0);
button = gtk_spin_button_new_with_range (0, 360, 1);
gtk_box_pack_start (GTK_BOX (box), button, TRUE, TRUE, 0);
g_signal_connect (button, "value-changed", G_CALLBACK (on_x_changed),
app);
box = gtk_hbox_new (TRUE, 6);
gtk_box_pack_start (GTK_BOX (vbox), box, FALSE, TRUE, 0);
label = gtk_label_new ("Rotate y-axis");
gtk_box_pack_start (GTK_BOX (box), label, TRUE, TRUE, 0);
button = gtk_spin_button_new_with_range (0, 360, 1);
gtk_box_pack_start (GTK_BOX (box), button, TRUE, TRUE, 0);
g_signal_connect (button, "value-changed", G_CALLBACK (on_y_changed),
app);
box = gtk_hbox_new (TRUE, 6);
gtk_box_pack_start (GTK_BOX (vbox), box, FALSE, TRUE, 0);
label = gtk_label_new ("Rotate z-axis");
gtk_box_pack_start (GTK_BOX (box), label, TRUE, TRUE, 0);
button = gtk_spin_button_new_with_range (0, 360, 1);
gtk_box_pack_start (GTK_BOX (box), button, TRUE, TRUE, 0);
g_signal_connect (button, "value-changed", G_CALLBACK (on_z_changed),
app);
box = gtk_hbox_new (TRUE, 6);
gtk_box_pack_start (GTK_BOX (vbox), box, FALSE, TRUE, 0);
label = gtk_label_new ("Adjust opacity");
gtk_box_pack_start (GTK_BOX (box), label, TRUE, TRUE, 0);
button = gtk_spin_button_new_with_range (0, 255, 1);
gtk_spin_button_set_value (GTK_SPIN_BUTTON (button), 255);
gtk_box_pack_start (GTK_BOX (box), button, TRUE, TRUE, 0);
g_signal_connect (button, "value-changed", G_CALLBACK
(on_opacity_changed), app);
gtk_widget_show_all (app->window);
/* Only show/show_all the stage after parent show. widget_show will call
* show on the stage.
*/
clutter_actor_show_all (app->stage);
funcScreenshot ();
gtk_main ();
return 0;
}
On Thu, Oct 30, 2008 at 9:36 PM, Saul Lethbridge
<[EMAIL PROTECTED]>wrote:
> I'm having some interesting outcomes from clutter_stage_read_pixels and
> gdk_pixbuf_save
>
> If I attempt to read the stage (which is embedded gtk) BEFORE the gtk
> widget is shown, I can read it successfully and the screenshot is
> successful. If I try to read it AFTER the clutter-gtk widget has been shown
> I get nothing but black in the saved image. Look here for the example code
> shown below (taken from
> http://github.com/bpeel/tractordodge/tree/master/tractordodge.c):
>
> int width = clutter_actor_get_width (stage);
> int height = clutter_actor_get_height (stage);
>
> guchar *data = clutter_stage_read_pixels (CLUTTER_STAGE (stage),
> 0, 0, width, height);
>
> guchar *p;
> GdkPixbuf *pb;
>
> for (p = data + width * height * 4; p > data; p -= 3)
> *(--p) = 255;
>
> pb = gdk_pixbuf_new_from_data (data, GDK_COLORSPACE_RGB, TRUE,
> 8, width, height, width * 4,
> (GdkPixbufDestroyNotify) g_free,
> NULL);
>
> gdk_pixbuf_save (pb, "screenie.png", "png", NULL, NULL);
>
> g_object_unref (pb);
>
