[gtkmm-documentation] Window icons and AboutDialog logos are Gdk::Texture

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 1cab5fcf56a271abb6e652e28170ef3b6f91908f
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Mon Nov 13 10:24:46 2017 +0100

    Window icons and AboutDialog logos are Gdk::Texture
    
    They were recently changed from Gdk::Pixbuf to Cairo::Surface.
    Now they have become Gdk::Texture.

 examples/book/buildapp/step9/exampleappwindow.cc   |    3 +--
 examples/book/dialogs/aboutdialog/examplewindow.cc |    4 ++--
 2 files changed, 3 insertions(+), 4 deletions(-)
---
diff --git a/examples/book/buildapp/step9/exampleappwindow.cc 
b/examples/book/buildapp/step9/exampleappwindow.cc
index 63acd68..25f50d6 100644
--- a/examples/book/buildapp/step9/exampleappwindow.cc
+++ b/examples/book/buildapp/step9/exampleappwindow.cc
@@ -114,8 +114,7 @@ ExampleAppWindow::ExampleAppWindow(BaseObjectType* cobject,
   set_show_menubar(true);
 
   // Set the window icon.
-  set_icon(Gdk::Cairo::create_surface_from_pixbuf(
-    Gdk::Pixbuf::create_from_resource("/org/gtkmm/exampleapp/exampleapp.png"), 1));
+  set_icon(Gdk::Texture::create_from_resource("/org/gtkmm/exampleapp/exampleapp.png"));
 }
 
 //static
diff --git a/examples/book/dialogs/aboutdialog/examplewindow.cc 
b/examples/book/dialogs/aboutdialog/examplewindow.cc
index aa00884..98d1117 100644
--- a/examples/book/dialogs/aboutdialog/examplewindow.cc
+++ b/examples/book/dialogs/aboutdialog/examplewindow.cc
@@ -39,8 +39,8 @@ ExampleWindow::ExampleWindow()
 
   m_Dialog.set_transient_for(*this);
 
-  m_Dialog.set_logo(Gdk::Cairo::create_surface_from_pixbuf(
-    Gdk::Pixbuf::create_from_resource("/about/gtkmm_logo.gif", -1, 40, true), 1));
+  m_Dialog.set_logo(Gdk::Texture::create_for_pixbuf(
+    Gdk::Pixbuf::create_from_resource("/about/gtkmm_logo.gif", -1, 40, true)));
   m_Dialog.set_program_name("Example application");
   m_Dialog.set_version("1.0.0");
   m_Dialog.set_copyright("Murray Cumming");