[gimp] app: don't use mask sampler in gimp_pickable_contiguous_region_by_seed()

[N/A <ell src gnome org>]

commit 03141fc30a95ae5769ef9192a8a123d634db18c7
Author: Ell <ell_se yahoo com>
Date:   Mon May 14 03:03:05 2018 -0400

    app: don't use mask sampler in gimp_pickable_contiguous_region_by_seed()
    
    In gimp_pickable_contiguous_region_by_seed(), use gegl_buffer_get()
    to sample the mask buffer, instead of using a sampler.  The sampler
    is created at the beginning of the operation, and is subsequently
    used after modifying the mask buffer, which should be avoided,
    since the sampler may return outdated cached data.

 app/core/gimppickable-contiguous-region.c |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)
---
diff --git a/app/core/gimppickable-contiguous-region.c b/app/core/gimppickable-contiguous-region.c
index 99391bb..d266641 100644
--- a/app/core/gimppickable-contiguous-region.c
+++ b/app/core/gimppickable-contiguous-region.c
@@ -598,7 +598,6 @@ find_contiguous_region (GeglBuffer          *src_buffer,
 {
   const Babl  *mask_format = babl_format ("Y float");
   GeglSampler *src_sampler;
-  GeglSampler *mask_sampler;
   gint         old_y;
   gint         start, end;
   gint         new_start, new_end;
@@ -611,8 +610,6 @@ find_contiguous_region (GeglBuffer          *src_buffer,
 
   src_sampler  = gegl_buffer_sampler_new (src_buffer,
                                           format, GEGL_SAMPLER_NEAREST);
-  mask_sampler = gegl_buffer_sampler_new (mask_buffer,
-                                          mask_format, GEGL_SAMPLER_NEAREST);
 
   segment_queue = g_queue_new ();
 
@@ -629,7 +626,9 @@ find_contiguous_region (GeglBuffer          *src_buffer,
         {
           gfloat val;
 
-          gegl_sampler_get (mask_sampler, x, y, NULL, &val, GEGL_ABYSS_NONE);
+          gegl_buffer_get (mask_buffer, GEGL_RECTANGLE (x, y, 1, 1), 1.0,
+                           mask_format, &val, GEGL_AUTO_ROWSTRIDE,
+                           GEGL_ABYSS_NONE);
 
           if (val != 0.0)
             {
@@ -690,7 +689,6 @@ find_contiguous_region (GeglBuffer          *src_buffer,
 
   g_queue_free (segment_queue);
 
-  g_object_unref (mask_sampler);
   g_object_unref (src_sampler);
 
 #ifdef FETCH_ROW