[metacity] Revert "ui.[c/h]: remove unused function"

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 89580e1eabaadedd322b2ab93cfd48db717edc77
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Thu Feb 19 00:58:27 2015 +0200

    Revert "ui.[c/h]: remove unused function"
    
    This reverts commit 54244b4b60016612270de42c00836ec5f90f262b.

 src/include/ui.h |    2 ++
 src/ui/ui.c      |   28 ++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 0 deletions(-)
---
diff --git a/src/include/ui.h b/src/include/ui.h
index 8f1261c..74ed2c1 100644
--- a/src/include/ui.h
+++ b/src/include/ui.h
@@ -178,6 +178,8 @@ int      meta_ui_get_drag_threshold       (MetaUI *ui);
 
 MetaUIDirection meta_ui_get_direction (void);
 
+GdkPixbuf *meta_ui_get_pixbuf_from_pixmap (Pixmap   pmap);
+
 #include "tabpopup.h"
 #include "tile-preview.h"
 
diff --git a/src/ui/ui.c b/src/ui/ui.c
index b2147e0..9ee7ea6 100644
--- a/src/ui/ui.c
+++ b/src/ui/ui.c
@@ -923,3 +923,31 @@ meta_ui_get_direction (void)
 
   return META_UI_DIRECTION_LTR;
 }
+
+GdkPixbuf *
+meta_ui_get_pixbuf_from_pixmap (Pixmap   pmap)
+{
+  GdkPixmap *gpmap;
+  GdkScreen *screen;
+  GdkPixbuf *pixbuf;
+  GdkColormap *cmap;
+  int width, height, depth;
+
+  gpmap = gdk_pixmap_foreign_new (pmap);
+  screen = gdk_drawable_get_screen (gpmap);
+
+  gdk_drawable_get_size (GDK_DRAWABLE (gpmap), &width, &height);
+  
+  depth = gdk_drawable_get_depth (GDK_DRAWABLE (gpmap));
+  if (depth <= 24)
+    cmap = gdk_screen_get_system_colormap (screen);
+  else
+    cmap = gdk_screen_get_rgba_colormap (screen);
+  
+  pixbuf = gdk_pixbuf_get_from_drawable (NULL, gpmap, cmap, 0, 0, 0, 0,
+                                         width, height);
+
+  g_object_unref (gpmap);
+
+  return pixbuf;
+}