[gtk+/gtk-2-24] [Quartz Bug 663182] NSImage throws an exception from _gtk_quartz_create_image_from_pixbuf()

[John Ralls <jralls src gnome org>]

commit fadc82ad2647277628fd140514b54473dbeb2f4c
Author: John Ralls <jralls ceridwen us>
Date:   Mon Nov 7 13:04:59 2011 -0800

    [Quartz Bug 663182] NSImage throws an exception from _gtk_quartz_create_image_from_pixbuf()
    
    If _gtk_quartz_create_image_from_pixbuf is given a pixbuf with size 0, 0
    or which produces an NSImage with size 0.0, 0.0, it throws an exception
    which Gtk doesn't handle.

 gtk/gtkdnd-quartz.c |    5 +++++
 gtk/gtkquartz.c     |    8 ++++++++
 2 files changed, 13 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkdnd-quartz.c b/gtk/gtkdnd-quartz.c
index e22fc70..6be1c15 100644
--- a/gtk/gtkdnd-quartz.c
+++ b/gtk/gtkdnd-quartz.c
@@ -1100,6 +1100,11 @@ gtk_drag_begin_idle (gpointer arg)
   point = [info->nsevent locationInWindow];
 
   drag_image = _gtk_quartz_create_image_from_pixbuf (info->icon_pixbuf);
+  if (drag_image == NULL)
+    {
+      g_object_unref (info->context);
+      return FALSE;
+    }
 
   [nswindow dragImage:drag_image
                    at:point
diff --git a/gtk/gtkquartz.c b/gtk/gtkquartz.c
index 4fdc915..286b418 100644
--- a/gtk/gtkquartz.c
+++ b/gtk/gtkquartz.c
@@ -35,9 +35,11 @@ _gtk_quartz_create_image_from_pixbuf (GdkPixbuf *pixbuf)
   int rowstride, pixbuf_width, pixbuf_height;
   gboolean has_alpha;
   NSImage *nsimage;
+  NSSize nsimage_size;
 
   pixbuf_width = gdk_pixbuf_get_width (pixbuf);
   pixbuf_height = gdk_pixbuf_get_height (pixbuf);
+  g_return_val_if_fail (pixbuf_width == 0 && pixbuf_height == 0, NULL);
   rowstride = gdk_pixbuf_get_rowstride (pixbuf);
   has_alpha = gdk_pixbuf_get_has_alpha (pixbuf);
 
@@ -57,6 +59,12 @@ _gtk_quartz_create_image_from_pixbuf (GdkPixbuf *pixbuf)
   CGColorSpaceRelease (colorspace);
 
   nsimage = [[NSImage alloc] initWithSize:NSMakeSize (pixbuf_width, pixbuf_height)];
+  nsimage_size = [nsimage size];
+  if (nsimage_size.width == 0.0 && nsimage_size.height == 0.0)
+    {
+      [nsimage release];
+      g_return_val_if_fail (FALSE, NULL);
+    }
   [nsimage lockFocus];
 
   context = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];