[gimp/goat-invasion] app: allow indexed images only at u8 precision

[Michael Natterer <mitch src gnome org>]

commit 3d56598e6984a35984b7e6c03f1cd04d0c8de3e8
Author: Michael Natterer <mitch gimp org>
Date:   Wed Apr 25 15:24:32 2012 +0200

    app: allow indexed images only at u8 precision

 app/actions/image-actions.c |   20 +++++++++++---------
 app/core/gimpimage.c        |    2 ++
 2 files changed, 13 insertions(+), 9 deletions(-)
---
diff --git a/app/actions/image-actions.c b/app/actions/image-actions.c
index 02f287f..94e1298 100644
--- a/app/actions/image-actions.c
+++ b/app/actions/image-actions.c
@@ -228,11 +228,12 @@ void
 image_actions_update (GimpActionGroup *group,
                       gpointer         data)
 {
-  GimpImage *image  = action_data_get_image (data);
-  gboolean   aux    = FALSE;
-  gboolean   lp     = FALSE;
-  gboolean   sel    = FALSE;
-  gboolean   groups = FALSE;
+  GimpImage *image    = action_data_get_image (data);
+  gboolean   is_u8    = FALSE;
+  gboolean   aux      = FALSE;
+  gboolean   lp       = FALSE;
+  gboolean   sel      = FALSE;
+  gboolean   groups   = FALSE;
 
   if (image)
     {
@@ -256,9 +257,10 @@ image_actions_update (GimpActionGroup *group,
 
       gimp_action_group_set_action_active (group, action, TRUE);
 
-      aux = (gimp_image_get_active_channel (image) != NULL);
-      lp  = ! gimp_image_is_empty (image);
-      sel = ! gimp_channel_is_empty (gimp_image_get_mask (image));
+      is_u8 = (gimp_image_get_precision (image) == GIMP_PRECISION_U8);
+      aux   = (gimp_image_get_active_channel (image) != NULL);
+      lp    = ! gimp_image_is_empty (image);
+      sel   = ! gimp_channel_is_empty (gimp_image_get_mask (image));
 
       layers = gimp_image_get_layers (image);
 
@@ -270,7 +272,7 @@ image_actions_update (GimpActionGroup *group,
 
   SET_SENSITIVE ("image-convert-rgb",       image);
   SET_SENSITIVE ("image-convert-grayscale", image);
-  SET_SENSITIVE ("image-convert-indexed",   image && !groups);
+  SET_SENSITIVE ("image-convert-indexed",   image && !groups && is_u8);
 
   SET_SENSITIVE ("image-flip-horizontal", image);
   SET_SENSITIVE ("image-flip-vertical",   image);
diff --git a/app/core/gimpimage.c b/app/core/gimpimage.c
index ee2c353..20efde0 100644
--- a/app/core/gimpimage.c
+++ b/app/core/gimpimage.c
@@ -1479,6 +1479,8 @@ gimp_image_new (Gimp              *gimp,
                 GimpPrecision      precision)
 {
   g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);
+  g_return_val_if_fail (base_type != GIMP_INDEXED ||
+                        precision != GIMP_PRECISION_U8, NULL);
 
   return g_object_new (GIMP_TYPE_IMAGE,
                        "gimp",      gimp,