[spice-gtk PATCH v2] spice-widget: init egl only after first gl_scanout

[Lukas Venhoda <lvenhoda@xxxxxxxxxx>]

When using GtkDrawingArea and EGL was not used, it was still initialized.
This produced warning messages on systems where EGL is not supported.

Move spice_egl_init from drawing_area_realize to gl_scanout.
---
Changes since v2:
 - added drawing_area_realized variable
    - only enable egl after spice-widget is fully realized
 - moved more of the code inside GDK_WINDOWING_X11 guard
Changes since v1:
 - changed from recursive call to if check
 - moved set_egl_enabled(display, true); after initialisation is finished
---
 src/spice-widget-priv.h |  3 +++
 src/spice-widget.c      | 34 +++++++++++++++++++++-------------
 2 files changed, 24 insertions(+), 13 deletions(-)

diff --git a/src/spice-widget-priv.h b/src/spice-widget-priv.h
index e36baf3..4b905f1 100644
--- a/src/spice-widget-priv.h
+++ b/src/spice-widget-priv.h
@@ -129,6 +129,9 @@ struct _SpiceDisplayPrivate {
 #endif
 #ifndef G_OS_WIN32
     struct {
+#ifdef GDK_WINDOWING_X11
+        gboolean            drawing_area_realized;
+#endif
         gboolean            context_ready;
         gboolean            enabled;
         EGLSurface          surface;
diff --git a/src/spice-widget.c b/src/spice-widget.c
index 9020b07..adbbfd2 100644
--- a/src/spice-widget.c
+++ b/src/spice-widget.c
@@ -568,20 +568,9 @@ drawing_area_realize(GtkWidget *area, gpointer user_data)
 {
 #ifdef GDK_WINDOWING_X11
     SpiceDisplay *display = SPICE_DISPLAY(user_data);
-    GError *err = NULL;
-
-    if (!GDK_IS_X11_DISPLAY(gdk_display_get_default()))
-        return;

-    if (!spice_egl_init(display, &err)) {
-        g_critical("egl init failed: %s", err->message);
-        g_clear_error(&err);
-    }
-
-    if (!spice_egl_realize_display(display, gtk_widget_get_window(area), &err)) {
-        g_critical("egl realize failed: %s", err->message);
-        g_clear_error(&err);
-    }
+    if (GDK_IS_X11_DISPLAY(gdk_display_get_default()))
+        display->priv->egl.drawing_area_realized = TRUE;
 #endif
 }

@@ -2662,8 +2651,27 @@ G_GNUC_INTERNAL
 void spice_display_widget_gl_scanout(SpiceDisplay *display)
 {
     SpiceDisplayPrivate *d = display->priv;
+    GError *err = NULL;

     SPICE_DEBUG("%s: got scanout",  __FUNCTION__);
+
+#ifdef GDK_WINDOWING_X11
+    if (GDK_IS_X11_DISPLAY(gdk_display_get_default()) &&
+        !d->egl.context_ready &&
+        d->egl.drawing_area_realized) {
+        if (!spice_egl_init(display, &err)) {
+            g_critical("egl init failed: %s", err->message);
+            g_clear_error(&err);
+        }
+
+        GtkWidget *area = gtk_stack_get_child_by_name(d->stack, "draw-area");
+        if (!spice_egl_realize_display(display, gtk_widget_get_window(area), &err)) {
+            g_critical("egl realize failed: %s", err->message);
+            g_clear_error(&err);
+        }
+    }
+#endif
+
     set_egl_enabled(display, true);

     if (d->egl.context_ready) {
--
2.7.4

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