[gtk+/wip/window-scales: 2/11] quartz: Implement get_scale_factor() on screen and window

[Alexander Larsson <alexl src gnome org>]

commit 20cbaf6edd5fb45b8c0f88487ca8f9d2f03c2d00
Author: Michael Natterer <mitch gimp org>
Date:   Fri Jan 18 15:47:29 2013 +0100

    quartz: Implement get_scale_factor() on screen and window
    
    which return 1.0 normally and 2.0 on retina displays.

 gdk/quartz/gdkscreen-quartz.c |   30 ++++++++++++++++++++++++++++++
 gdk/quartz/gdkwindow-quartz.c |   21 +++++++++++++++++++++
 2 files changed, 51 insertions(+), 0 deletions(-)
---
diff --git a/gdk/quartz/gdkscreen-quartz.c b/gdk/quartz/gdkscreen-quartz.c
index 84269f5..4b19afc 100644
--- a/gdk/quartz/gdkscreen-quartz.c
+++ b/gdk/quartz/gdkscreen-quartz.c
@@ -427,6 +427,35 @@ gdk_quartz_screen_get_monitor_workarea (GdkScreen    *screen,
   GDK_QUARTZ_RELEASE_POOL;
 }
 
+/* Protocol to build cleanly for OSX < 10.7 */
+ protocol ScaleFactor
+- (CGFloat) backingScaleFactor;
+ end
+
+gdouble
+_gdk_quartz_screen_get_monitor_scale_factor (GdkScreen *screen,
+                                             gint       monitor_num)
+{
+  GdkScreenQuartz *quartz_screen;
+  NSArray *array;
+  NSScreen *nsscreen;
+  gdouble scale_factor = 1.0;
+
+  quartz_screen = GDK_SCREEN_QUARTZ (screen);
+
+  GDK_QUARTZ_ALLOC_POOL;
+
+  array = [NSScreen screens];
+  nsscreen = [array objectAtIndex:monitor_num];
+
+  if (gdk_quartz_osx_version() >= GDK_OSX_LION)
+    scale_factor = [(id <ScaleFactor>) nsscreen backingScaleFactor];
+
+  GDK_QUARTZ_RELEASE_POOL;
+
+  return scale_factor;
+}
+
 static gchar *
 gdk_quartz_screen_make_display_name (GdkScreen *screen)
 {
@@ -491,4 +520,5 @@ gdk_quartz_screen_class_init (GdkQuartzScreenClass *klass)
   screen_class->query_depths = _gdk_quartz_screen_query_depths;
   screen_class->query_visual_types = _gdk_quartz_screen_query_visual_types;
   screen_class->list_visuals = _gdk_quartz_screen_list_visuals;
+  screen_class->get_monitor_scale_factor = _gdk_quartz_screen_get_monitor_scale_factor;
 }
diff --git a/gdk/quartz/gdkwindow-quartz.c b/gdk/quartz/gdkwindow-quartz.c
index 2403b04..d5eac3f 100644
--- a/gdk/quartz/gdkwindow-quartz.c
+++ b/gdk/quartz/gdkwindow-quartz.c
@@ -2997,6 +2997,26 @@ gdk_quartz_window_get_input_shape (GdkWindow *window)
   return NULL;
 }
 
+/* Protocol to build cleanly for OSX < 10.7 */
+ protocol ScaleFactor
+- (CGFloat) backingScaleFactor;
+ end
+
+static gdouble
+gdk_quartz_window_get_scale_factor (GdkWindow *window)
+{
+  GdkWindowImplQuartz *impl;
+
+  if (GDK_WINDOW_DESTROYED (window))
+    return 1.0;
+
+  impl = GDK_WINDOW_IMPL_QUARTZ (GDK_WINDOW_OBJECT (window)->impl);
+
+  if (gdk_quartz_osx_version() >= GDK_OSX_LION)
+    return [(id <ScaleFactor>) impl->toplevel backingScaleFactor];
+
+  return 1.0;
+}
 
 static void
 gdk_window_impl_quartz_class_init (GdkWindowImplQuartzClass *klass)
@@ -3036,6 +3056,7 @@ gdk_window_impl_quartz_class_init (GdkWindowImplQuartzClass *klass)
   impl_class->get_input_shape = gdk_quartz_window_get_input_shape;
   impl_class->begin_paint_region = gdk_window_impl_quartz_begin_paint_region;
   impl_class->end_paint = gdk_window_impl_quartz_end_paint;
+  impl_class->get_scale_factor = gdk_quartz_window_get_scale_factor;
 
   impl_class->focus = gdk_quartz_window_focus;
   impl_class->set_type_hint = gdk_quartz_window_set_type_hint;