Hi,
I've managed to create a GtkOffscreenWindow that can snapshot a
single widget, but I need to snapshot a bunch of widget and I'm having
difficulties.
I'm not sure if the design of GtkOffscreenWindow is such that I'm
supposed to:
1) reuse one window, adding and removing widgets to be snapshotted or
2) create a new GtkOffscreenWindow each time
If the intent is 1, how am I supposed to remove objects from the
window? I thought that just gtk_widget_destroy on the widget would
remove it from the window, but I get a GTK_IS_DRAWABLE assertion error
in the main loop after doing that and trying to snapshot a new widget.
If the intent is 2, how am I supposed to destroy the window? I get a
GTK_IS_WIDGET assertion error when I try to gtk_widget_destroy it.
Currently, I'm doing neither, and creating a new window each time I
snapshot a widget, but I'm pretty sure I'm leaking offscreen windows.
Here's my code (note, this is all transcribed by hand from Java JNA
code, the function names are right but I haven't compiled it so am not
sure if there are any typos).
// CODE
GtkOffscreenWindow* offscreenWindow;
void force_draw(GtkWidget* widget) {
gtk_widget_queue_draw(widget);
GdkWindow* window = gtk_widget_get_window(widget);
gdk_window_process_updates(window, true);
}
GtkPixmap* snapshotWidget(GtkWidget* widget) {
// Caching doesn't work, must create a new one every time (the widget
parameter is gtk_widget_destroy'ed by the caller)
// if (!offscreenWindow)
offscreenWindow = gtk_offscreen_window_new();
gtk_container_add(offscreenWindow, widget);
gtk_widget_show(offscreenWindow);
force_draw(widget);
// This doesn't seem to make any difference
// force_draw(offscreenWindow);
GtkPixmap* result = gtk_offscreen_window_get_pixmap(offscreenWindow)
// Doesn't work
// gtk_widget_destroy(offscreenWindow);
// Doesn't work
// gtk_container_remove(offscreenWindow, widget);
// Doesn't work
// gtk_widget_destroy(widget);
return result;
}
-- Aaron
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