[gimp] app: in GimpCurvesTool, calculate histogram asynchronously

[N/A <ell src gnome org>]

commit 49382e53d55d3be65135130a2898038aad1a3719
Author: Ell <ell_se yahoo com>
Date:   Fri May 11 12:14:26 2018 -0400

    app: in GimpCurvesTool, calculate histogram asynchronously
    
    In GimpCurvesTool, calculate the histogram of the target drawable
    asynchronously, rather than synchronously, to avoid blocking the UI
    while the histogram is calculated.

 app/tools/gimpcurvestool.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/app/tools/gimpcurvestool.c b/app/tools/gimpcurvestool.c
index 2ed792f..4263c0f 100644
--- a/app/tools/gimpcurvestool.c
+++ b/app/tools/gimpcurvestool.c
@@ -203,7 +203,8 @@ gimp_curves_tool_initialize (GimpTool     *tool,
                  NULL);
 
   histogram = gimp_histogram_new (config->linear);
-  gimp_drawable_calculate_histogram (drawable, histogram, FALSE);
+  g_object_unref (gimp_drawable_calculate_histogram_async (
+    drawable, histogram, FALSE));
   gimp_histogram_view_set_background (GIMP_HISTOGRAM_VIEW (c_tool->graph),
                                       histogram);
   g_object_unref (histogram);
@@ -628,8 +629,8 @@ gimp_curves_tool_config_notify (GimpFilterTool   *filter_tool,
                      NULL);
 
       histogram = gimp_histogram_new (curves_config->linear);
-      gimp_drawable_calculate_histogram (GIMP_TOOL (filter_tool)->drawable,
-                                         histogram, FALSE);
+      g_object_unref (gimp_drawable_calculate_histogram_async (
+        GIMP_TOOL (filter_tool)->drawable, histogram, FALSE));
       gimp_histogram_view_set_background (GIMP_HISTOGRAM_VIEW (curves_tool->graph),
                                           histogram);
       g_object_unref (histogram);