[gegl] text: correct text bounds calculation

[N/A <ell src gnome org>]

commit 125ac625e4025a2dae33829361f131ed9785cff9
Author: Ell <ell_se yahoo com>
Date:   Tue Nov 22 09:50:13 2016 -0500

    text: correct text bounds calculation
    
    Take the text offset into account; that's particularly sifnificant
    when the text is not left-aligned.

 operations/external/text.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/operations/external/text.c b/operations/external/text.c
index d155d45..02e594d 100644
--- a/operations/external/text.c
+++ b/operations/external/text.c
@@ -151,11 +151,12 @@ static void text_layout_text (GeglOp *self,
 
   if (width && height)
     {
-      int w, h;
+      PangoRectangle extents;
 
-      pango_layout_get_pixel_size (layout, &w, &h);
-      *width = (gdouble)w;
-      *height = (gdouble)h;
+      pango_layout_get_pixel_extents (layout, &extents, NULL);
+
+      *width  = (gdouble) (extents.x + extents.width);
+      *height = (gdouble) (extents.y + extents.height);
     }
   else
     {