[gimp] Bug 734705 - v2.9.1 crashes when scaling an image in indexed colors mode

[Michael Natterer <mitch src gnome org>]

commit b663b8058f8828493f3a3b4c5c0bd131daf025a6
Author: Michael Natterer <mitch gimp org>
Date:   Fri Aug 15 09:23:02 2014 +0200

    Bug 734705 - v2.9.1 crashes when scaling an image in indexed colors mode
    
    Use gimp_image_get_format() instead of gimp_babl_format() in
    gimp_drawable_real_estimate_memsize() because the latter can't handle
    indexed formats and returns NULL.

 app/core/gimpdrawable.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/app/core/gimpdrawable.c b/app/core/gimpdrawable.c
index f456a30..1dffdc9 100644
--- a/app/core/gimpdrawable.c
+++ b/app/core/gimpdrawable.c
@@ -765,11 +765,14 @@ gimp_drawable_real_estimate_memsize (const GimpDrawable *drawable,
                                      gint                width,
                                      gint                height)
 {
+  GimpImage  *image  = gimp_item_get_image (GIMP_ITEM (drawable));
+  gboolean    linear = gimp_drawable_get_linear (drawable);
   const Babl *format;
 
-  format = gimp_babl_format (gimp_drawable_get_base_type (drawable),
-                             gimp_babl_precision (component_type, FALSE),
-                             gimp_drawable_has_alpha (drawable));
+  format = gimp_image_get_format (image,
+                                  gimp_drawable_get_base_type (drawable),
+                                  gimp_babl_precision (component_type, linear),
+                                  gimp_drawable_has_alpha (drawable));
 
   return (gint64) babl_format_get_bytes_per_pixel (format) * width * height;
 }