GtkOffscreenWindow implementation for #604901

2 files changed, 98 insertions, 0 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index d8b4ea8bd2..d5db0a9958 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -60,6 +60,7 @@ noinst_PROGRAMS =  $(TEST_PROGS)	\
 	testnotebookdnd			\
 	testnouiprint			\
 	testoffscreen			\
+	testoffscreenwindow		\
 	testorientable			\
 	testprint			\
 	testrgb				\
@@ -143,6 +144,7 @@ testmultiscreen_DEPENDENCIES = $(TEST_DEPS)
 testnotebookdnd_DEPENDENCIES = $(TEST_DEPS)
 testnouiprint_DEPENDENCIES = $(TEST_DEPS)
 testoffscreen_DEPENDENCIES = $(TEST_DEPS)
+testoffscreenwindow_DEPENDENCIES = $(TEST_DEPS)
 testorientable_DEPENDENCIES = $(TEST_DEPS)
 testprint_DEPENDENCIES = $(TEST_DEPS)
 testrecentchooser_DEPENDENCIES = $(TEST_DEPS)
@@ -207,6 +209,7 @@ testmultiscreen_LDADD = $(LDADDS)
 testnotebookdnd_LDADD = $(LDADDS)
 testnouiprint_LDADD = $(LDADDS)
 testoffscreen_LDADD = $(LDADDS)
+testoffscreenwindow_LDADD = $(LDADDS)
 testorientable_LDADD = $(LDADDS)
 testprint_LDADD = $(LDADDS)
 testrecentchooser_LDADD = $(LDADDS)
@@ -343,6 +346,9 @@ testoffscreen_SOURCES = 	\
 	gtkoffscreenbox.h	\
 	testoffscreen.c
 
+testoffscreenwindnow_SOURCES =	\
+	testoffscreenwindow.c
+
 testwindow_SOURCES = 	\
 	testwindows.c
 
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;
+}