GtkOffscreenWindow implementation for #604901

1 files changed, 92 insertions, 0 deletions

diff --git a/tests/testoffscreenwindow.c b/tests/testoffscreenwindow.c
new file mode 100644
index 0000000000..a70e36b1ae
--- /dev/null
+++ b/tests/testoffscreenwindow.c
@@ -0,0 +1,92 @@
+#include <gtk/gtk.h>
+
+static gboolean
+da_expose (GtkWidget *widget,
+           GdkEventExpose *event,
+           gpointer user_data)
+{
+  GtkOffscreenWindow *offscreen = (GtkOffscreenWindow *)user_data;
+  GdkPixmap *pixmap;
+  cairo_t *cr;
+
+  if (GTK_WIDGET_DRAWABLE (widget))
+    {
+      pixmap = gdk_offscreen_window_get_pixmap (GTK_WIDGET (offscreen)->window);
+
+      cr = gdk_cairo_create (widget->window);
+      gdk_cairo_set_source_pixmap (cr, pixmap, 50, 50);
+      cairo_paint (cr);
+      cairo_destroy (cr);
+    }
+
+  return FALSE;
+}
+
+static gboolean
+offscreen_damage (GtkWidget      *widget,
+                  GdkEventExpose *event,
+                  GtkWidget      *da)
+{
+  gtk_widget_queue_draw (da);
+
+  return TRUE;
+}
+
+static gboolean
+da_button_press (GtkWidget *area, GdkEventButton *event, GtkWidget *button)
+{
+  gtk_widget_set_size_request (button, 150, 60);
+  return TRUE;
+}
+
+int
+main (int argc, char **argv)
+{
+  GtkWidget *window;
+  GtkWidget *button;
+  GtkWidget *offscreen;
+  GtkWidget *da;
+
+  gtk_init (&argc, &argv);
+
+  offscreen = gtk_offscreen_window_new ();
+
+  button = gtk_button_new_with_label ("Test");
+  gtk_widget_set_size_request (button, 50, 50);
+  gtk_container_add (GTK_CONTAINER (offscreen), button);
+  gtk_widget_show (button);
+
+  gtk_widget_show (offscreen);
+
+  /* Queue exposures and ensure they are handled so
+   * that the result is uptodate for the first
+   * expose of the window. If you want to get further
+   * changes, also track damage on the offscreen
+   * as done above.
+   */
+  gtk_widget_draw (offscreen, NULL);
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  da = gtk_drawing_area_new ();
+  gtk_container_add (GTK_CONTAINER (window), da);
+
+  g_signal_connect (da,
+                    "expose-event",
+                    G_CALLBACK (da_expose),
+                    offscreen);
+
+  g_signal_connect (offscreen,
+                    "damage-event",
+                    G_CALLBACK (offscreen_damage),
+                    da);
+
+  gtk_widget_add_events (da, GDK_BUTTON_PRESS_MASK);
+  g_signal_connect (da, "button_press_event", G_CALLBACK (da_button_press),
+                    button);
+
+  gtk_widget_show_all (window);
+
+  gtk_main();
+
+  return 0;
+}