Fix issue with expose on GTK+ 3.

gtk/src/gtk_display_driver_gtk.cpp

@@ -108,15 +108,7 @@ S9xGTKDisplayDriver::output (void *src,
                 height,
                 24);
 
-#ifndef USE_GTK3
+    cairo_t *cr = window->get_cairo ();
-    cairo_t *cr = gdk_cairo_create (gtk_widget_get_window (drawing_area));
-#else
-    cairo_rectangle_int_t rect = { x, y, dst_width, dst_height };
-    cairo_region_t *region = cairo_region_create_rectangle (&rect);
-    GdkDrawingContext *context = gdk_window_begin_draw_frame (gtk_widget_get_window (drawing_area),
-                                                              region);
-    cairo_t *cr = gdk_drawing_context_get_cairo_context (context);
-#endif
 
     gdk_cairo_set_source_pixbuf (cr, pixbuf, x, y);
 
@@ -140,13 +132,7 @@ S9xGTKDisplayDriver::output (void *src,
     cairo_rectangle (cr, x, y, dst_width, dst_height);
     cairo_fill (cr);
 
-#ifndef USE_GTK3
+    window->release_cairo ();
-    cairo_destroy (cr);
-#else
-    gdk_window_end_draw_frame (gtk_widget_get_window (drawing_area), context);
-    cairo_region_destroy (region);
-#endif
-
     window->set_mouseable_area (x, y, width, height);
 
     return;
@@ -219,22 +205,14 @@ S9xGTKDisplayDriver::clear (void)
     width = allocation.width;
     height = allocation.height;
 
-#ifndef USE_GTK3
+    cairo_t *cr = window->get_cairo ();
-    cairo_t *cr = gdk_cairo_create (gtk_widget_get_window (drawing_area));
-#else
-    cairo_rectangle_int_t rect = { 0, 0, width, height };
-    cairo_region_t *region = cairo_region_create_rectangle (&rect);
-    GdkDrawingContext *context = gdk_window_begin_draw_frame (gtk_widget_get_window (drawing_area),
-                                                              region);
-    cairo_t *cr = gdk_drawing_context_get_cairo_context (context);
-#endif
 
     cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
 
     if (window->last_width <= 0 || window->last_height <= 0)
     {
         cairo_paint (cr);
-        cairo_destroy (cr);
+        window->release_cairo ();
 
         return;
     }
@@ -265,12 +243,7 @@ S9xGTKDisplayDriver::clear (void)
 
     cairo_fill (cr);
 
-#ifndef USE_GTK3
+    window->release_cairo ();
-    cairo_destroy (cr);
-#else
-    gdk_window_end_draw_frame (gtk_widget_get_window (drawing_area), context);
-    cairo_region_destroy (region);
-#endif
 
     return;
 }

gtk/src/gtk_s9xwindow.cpp

@@ -139,11 +139,14 @@ event_drawingarea_draw (GtkWidget *widget,
                         cairo_t   *cr,
                         gpointer  data)
 {
-    ((Snes9xWindow *) data)->expose ();
+    Snes9xWindow *window = (Snes9xWindow *) data;
+    window->cr = cr;
+    window->cairo_owned = FALSE;
+    window->expose ();
+    window->cr = NULL;
 
     return FALSE;
 }
-
 #endif
 
 #ifndef USE_GTK3
@@ -600,6 +603,8 @@ Snes9xWindow::Snes9xWindow (Snes9xConfig *config) :
     maximized_state        = 0;
     focused                = 1;
     paused_from_focus_loss = 0;
+    cr                     = NULL;
+    cairo_owned            = 0;
 
     if (gtk_icon_theme_has_icon (gtk_icon_theme_get_default (), "snes9x"))
     {
@@ -1952,3 +1957,44 @@ Snes9xWindow::resize_to_multiple (int factor)
 
     return;
 }
+
+cairo_t *
+Snes9xWindow::get_cairo (void)
+{
+    if (cr)
+        return cr;
+
+    GtkWidget *drawing_area = GTK_WIDGET (this->drawing_area);
+
+#ifndef USE_GTK3
+    cr = gdk_cairo_create (gtk_widget_get_window (drawing_area));
+#else
+    GtkAllocation allocation;
+    gtk_widget_get_allocation (drawing_area, &allocation);
+
+    cairo_rectangle_int_t rect = { 0, 0, allocation.width, allocation.height };
+    cairo_region = cairo_region_create_rectangle (&rect);
+    gdk_drawing_context = gdk_window_begin_draw_frame (gtk_widget_get_window (drawing_area),
+                                                       cairo_region);
+    cr = gdk_drawing_context_get_cairo_context (gdk_drawing_context);
+#endif
+
+    cairo_owned = TRUE;
+    return cr;
+}
+
+void
+Snes9xWindow::release_cairo (void)
+{
+    if (cairo_owned)
+    {
+#ifndef USE_GTK3
+        cairo_destroy (cr);
+#else
+        gdk_window_end_draw_frame (gtk_widget_get_window (GTK_WIDGET (drawing_area)), gdk_drawing_context);
+        cairo_region_destroy (cairo_region);
+#endif
+        cairo_owned = FALSE;
+        cr = NULL;
+    }
+}

gtk/src/gtk_s9xwindow.h

@@ -62,6 +62,9 @@ class Snes9xWindow : public GtkBuilderWindow
         void resize_viewport (int width, int height);
         void expose (void);
 
+        cairo_t *get_cairo (void);
+        void release_cairo (void);
+
         Snes9xConfig   *config;
         int            user_pause, sys_pause;
         int            user_rewind;
@@ -78,6 +81,12 @@ class Snes9xWindow : public GtkBuilderWindow
         GdkCursor      *default_cursor, *empty_cursor;
         GtkDrawingArea *drawing_area;
         GtkWidget      *recent_menu;
+        cairo_t        *cr;
+        int            cairo_owned;
+#ifdef USE_GTK3
+        GdkDrawingContext *gdk_drawing_context;
+        cairo_region_t    *cairo_region;
+#endif
 };
 
 typedef struct gtk_splash_t {