Document exporting/printing text with X core fonts to outline images on cairo

* src/xfns.c (Fx_export_frames) [USE_CAIRO]:
(Fx_print_frames_dialog) [USE_CAIRO && USE_GTK]: Add notes on x font backend.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/xfns.c b/src/xfns.c
index 46f19ff82ac..5787abb5281 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -7446,7 +7446,10 @@ FRAMES should be nil (the selected frame), a frame, or a list of
 frames (each of which corresponds to one page).  Each frame should be
 visible.  Optional arg TYPE should be either `pdf' (default), `png',
 `postscript', or `svg'.  Supported types are determined by the
-compile-time configuration of cairo.  */)
+compile-time configuration of cairo.
+
+Note: Text drawn with the `x' font backend is shown with hollow boxes
+unless TYPE is `png'.  */)
      (Lisp_Object frames, Lisp_Object type)
 {
   Lisp_Object rest, tmp;
@@ -7548,7 +7551,9 @@ DEFUN ("x-print-frames-dialog", Fx_print_frames_dialog, Sx_print_frames_dialog,
        doc: /* Pop up a print dialog to print the current contents of FRAMES.
 FRAMES should be nil (the selected frame), a frame, or a list of
 frames (each of which corresponds to one page).  Each frame should be
-visible.  */)
+visible.
+
+Note: Text drawn with the `x' font backend is shown with hollow boxes.  */)
      (Lisp_Object frames)
 {
   Lisp_Object rest, tmp;