[gtk+] Add gdk_window_get_unscaled_size

[Alexander Larsson <alexl src gnome org>]

commit 1eb3b34bcebc11a7a46346f2f35d845e4194cb45
Author: Alexander Larsson <alexl redhat com>
Date:   Thu Nov 20 11:50:11 2014 +0100

    Add gdk_window_get_unscaled_size
    
    This is required for the X backend GL integration. If the
    window has a height that is not a multiple of the window scale
    we can't properly do the y coordinate flipping that GL needs.
    Other backends can ignore this and use the default implementation.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=739750

 gdk/gdkinternals.h      |    4 +++-
 gdk/gdkwindow.c         |   31 +++++++++++++++++++++++++++++++
 gdk/gdkwindowimpl.h     |    3 +++
 gdk/x11/gdkwindow-x11.c |   15 +++++++++++++++
 4 files changed, 52 insertions(+), 1 deletions(-)
---
diff --git a/gdk/gdkinternals.h b/gdk/gdkinternals.h
index be1b0ed..ca89811 100644
--- a/gdk/gdkinternals.h
+++ b/gdk/gdkinternals.h
@@ -375,7 +375,9 @@ void       _gdk_window_update_size       (GdkWindow      *window);
 gboolean   _gdk_window_update_viewable   (GdkWindow      *window);
 GdkGLContext * gdk_window_get_paint_gl_context (GdkWindow *window,
                                                 GError   **error);
-
+void gdk_window_get_unscaled_size (GdkWindow *window,
+                                   int *unscaled_width,
+                                   int *unscaled_height);
 
 void       _gdk_window_process_updates_recurse (GdkWindow *window,
                                                 cairo_region_t *expose_region);
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index 4ebf461..6d56a6c 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -11045,6 +11045,37 @@ gdk_window_get_scale_factor (GdkWindow *window)
   return 1;
 }
 
+/* Returns the *real* unscaled size, which may be a fractional size
+   in window scale coordinates. We need this to properly handle GL
+   coordinates which are y-flipped in the real coordinates. */
+void
+gdk_window_get_unscaled_size (GdkWindow *window,
+                              int *unscaled_width,
+                              int *unscaled_height)
+{
+  GdkWindowImplClass *impl_class;
+  gint scale;
+
+  g_return_if_fail (GDK_IS_WINDOW (window));
+
+  if (window->impl_window == window)
+    {
+      impl_class = GDK_WINDOW_IMPL_GET_CLASS (window->impl);
+
+      if (impl_class->get_unscaled_size)
+        return impl_class->get_unscaled_size (window, unscaled_width, unscaled_height);
+    }
+
+  scale = gdk_window_get_scale_factor (window);
+
+  if (unscaled_width)
+    *unscaled_width = window->width * scale;
+
+  if (unscaled_height)
+    *unscaled_height = window->height * scale;
+}
+
+
 /**
  * gdk_window_set_opaque_region:
  * @window: a top-level or non-native #GdkWindow
diff --git a/gdk/gdkwindowimpl.h b/gdk/gdkwindowimpl.h
index 2c1bc1e..b8fb0f0 100644
--- a/gdk/gdkwindowimpl.h
+++ b/gdk/gdkwindowimpl.h
@@ -279,6 +279,9 @@ struct _GdkWindowImplClass
                                            GdkAtom         property);
 
   gint         (* get_scale_factor)       (GdkWindow      *window);
+  void         (* get_unscaled_size)      (GdkWindow      *window,
+                                           int            *unscaled_width,
+                                           int            *unscaled_height);
 
   void         (* set_opaque_region)      (GdkWindow      *window,
                                            cairo_region_t *region);
diff --git a/gdk/x11/gdkwindow-x11.c b/gdk/x11/gdkwindow-x11.c
index 525a798..a7be5de 100644
--- a/gdk/x11/gdkwindow-x11.c
+++ b/gdk/x11/gdkwindow-x11.c
@@ -198,6 +198,20 @@ _gdk_x11_window_update_size (GdkWindowImplX11 *impl)
     }
 }
 
+void
+gdk_x11_window_get_unscaled_size (GdkWindow *window,
+                                  int *unscaled_width,
+                                  int *unscaled_height)
+{
+  GdkWindowImplX11 *impl = GDK_WINDOW_IMPL_X11 (window->impl);
+
+  if (unscaled_width)
+    *unscaled_width = impl->unscaled_width;
+
+  if (unscaled_height)
+    *unscaled_height = impl->unscaled_height;
+}
+
 static void
 set_sync_counter(Display     *display,
                 XSyncCounter counter,
@@ -5758,4 +5772,5 @@ gdk_window_impl_x11_class_init (GdkWindowImplX11Class *klass)
   impl_class->show_window_menu = gdk_x11_window_show_window_menu;
   impl_class->create_gl_context = gdk_x11_window_create_gl_context;
   impl_class->invalidate_for_new_frame = gdk_x11_window_invalidate_for_new_frame;
+  impl_class->get_unscaled_size = gdk_x11_window_get_unscaled_size;
 }