From: Christian Hergert <christian@hergert.me>
Date: Thu, 17 Mar 2016 06:35:20 +0000 (-0700)
Subject: wayland: avoid dropping surfaces when possible
X-Git-Tag: archive/raspbian/4.4.1+ds1-2+rpi1^2~18^2~24^2~5152
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=c48bc48dda852519e1951b03eb222a89a62efd29;p=gtk4.git

wayland: avoid dropping surfaces when possible

If the configure-event gives us the same size as we had before,
which is common for animation resizes, then try to keep the
existing buffer around. This saves us a memfd_create() syscall
on every frame.

https://bugzilla.gnome.org/show_bug.cgi?id=763350
---

diff --git a/gdk/wayland/gdkwindow-wayland.c b/gdk/wayland/gdkwindow-wayland.c
index 707b2dcb43..46255ef277 100644
--- a/gdk/wayland/gdkwindow-wayland.c
+++ b/gdk/wayland/gdkwindow-wayland.c
@@ -256,6 +256,11 @@ gdk_wayland_window_update_size (GdkWindow *window,
   GdkRectangle area;
   cairo_region_t *region;
 
+  if ((window->width == width) &&
+      (window->height == height) &&
+      (impl->scale == scale))
+    return;
+
   drop_cairo_surfaces (window);
 
   window->width = width;