master e111a5f 08/35: Draw offscreen surface

[Lars Ingebrigtsen]

branch: master
commit e111a5f3a0a3f1354df6bfb23cb121f38046853b
Author: Po Lu <luangruo@yahoo.com>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Draw offscreen surface
    
    * src/xwidget.c (xv_do_draw): Draw offscreen surface.
---
 src/xwidget.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/xwidget.c b/src/xwidget.c
index ff7d095..c758987 100644
--- a/src/xwidget.c
+++ b/src/xwidget.c
@@ -520,12 +520,20 @@ xwidget_hide_view (struct xwidget_view *xv)
 static void
 xv_do_draw (struct xwidget_view *xw, struct xwidget *w)
 {
+  GtkOffscreenWindow *wnd;
+  cairo_surface_t *surface;
   block_input ();
+  wnd = GTK_OFFSCREEN_WINDOW (w->widgetwindow_osr);
+  surface = gtk_offscreen_window_get_surface (wnd);
 
   cairo_save (xw->cr_context);
-  cairo_translate (xw->cr_context, -xw->clip_left,
-                  -xw->clip_top);
-  gtk_widget_draw (w->widgetwindow_osr, xw->cr_context);
+  if (surface)
+    {
+      cairo_set_source_surface (xw->cr_context, surface, xw->clip_left,
+                               xw->clip_top);
+      cairo_set_operator (xw->cr_context, CAIRO_OPERATOR_SOURCE);
+      cairo_paint (xw->cr_context);
+    }
   cairo_restore (xw->cr_context);
 
   unblock_input ();