[gimp] libgimpcolor: support CAIRO_FORMAT_A8 in gimp_cairo_surface_get_format()

[Jehan Pagès <jehanp src gnome org>]

commit 85c0373489a0bafd16774350c4023b493c39e727
Author: Jehan <jehan girinstud io>
Date:   Fri Jun 16 16:21:06 2017 +0200

    libgimpcolor: support CAIRO_FORMAT_A8 in gimp_cairo_surface_get_format()

 libgimpcolor/gimpcairo.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/libgimpcolor/gimpcairo.c b/libgimpcolor/gimpcairo.c
index 8cc818d..edf5b53 100644
--- a/libgimpcolor/gimpcairo.c
+++ b/libgimpcolor/gimpcairo.c
@@ -164,6 +164,7 @@ gimp_cairo_surface_get_format (cairo_surface_t *surface)
     {
     case CAIRO_FORMAT_RGB24:  return babl_format ("cairo-RGB24");
     case CAIRO_FORMAT_ARGB32: return babl_format ("cairo-ARGB32");
+    case CAIRO_FORMAT_A8:     return babl_format ("cairo-A8");
 
     default:
       break;