From: Po Lu <luangruo@yahoo.com>
Date: Thu, 4 Nov 2021 10:53:55 +0000 (+0800)
Subject: Draw offscreen surface
X-Git-Tag: emacs-29.0.90~3671^2~146
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=e111a5f3a0a3f1354df6bfb23cb121f38046853b;p=emacs.git

Draw offscreen surface

* src/xwidget.c (xv_do_draw): Draw offscreen surface.
---

diff --git a/src/xwidget.c b/src/xwidget.c
index ff7d09549bf..c7589871584 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 ();