[gegl/soc-2011-seamless-clone] Fix seamless-clone-prepare to save the result, rename things in render

[Barak Itkin <barakitkin src gnome org>]

commit 2d2d01d47f84357401e142c1ba0278c5402efd9e
Author: Barak Itkin <lightningismyname gmail com>
Date:   Wed Aug 17 00:11:21 2011 +0300

    Fix seamless-clone-prepare to save the result, rename things in render
    
    In the seamless-clone-prepare op, warn if the destination pointer for
    the result is NULL. Also, actually store the pointer to the result at
    the given pointer to a pointer.
    
    In the seamless-clone-render op, rename the offset properties to "x"
    and "y" instead of "xoff" and "yoff".

 .../common/seamless-clone/seamless-clone-prepare.c |   18 +++++++++++++++---
 .../common/seamless-clone/seamless-clone-render.c  |   20 ++++++++++----------
 2 files changed, 25 insertions(+), 13 deletions(-)
---
diff --git a/operations/common/seamless-clone/seamless-clone-prepare.c b/operations/common/seamless-clone/seamless-clone-prepare.c
index 9aa399c..fb63654 100644
--- a/operations/common/seamless-clone/seamless-clone-prepare.c
+++ b/operations/common/seamless-clone/seamless-clone-prepare.c
@@ -45,9 +45,15 @@ gegl_chant_pointer (result, _("result"),
 static void
 prepare (GeglOperation *operation)
 {
-  Babl *format = babl_format ("R'G'B'A float");
+  Babl     *format = babl_format ("R'G'B'A float");
+  gpointer *dest = GEGL_CHANT_PROPERTIES (operation) -> result;
 
   gegl_operation_set_format (operation, "input",  format);
+
+  if (dest == NULL)
+    {
+      g_warning ("sc-prepare: No place to store the preprocessing result given!");
+    }
 }
 
 
@@ -57,7 +63,13 @@ process (GeglOperation       *operation,
          const GeglRectangle *roi)
 {
   ScPreprocessResult *result = sc_preprocess_new ();
-  
+  gpointer           *dest = GEGL_CHANT_PROPERTIES (operation) -> result;
+
+  if (dest == NULL)
+    {
+      return FALSE;
+    }
+    
   /* First, find the paste outline */
   result->outline = sc_outline_find_ccw (roi, input);
 
@@ -71,7 +83,7 @@ process (GeglOperation       *operation,
    * by using a regular operation rather than a sink one, so that we can
    * output UV coords */
 
-  GEGL_CHANT_PROPERTIES (operation) -> result = result;
+  *dest = result;
 
   /*
   sc_mesh_sampling_free (mesh_sampling);
diff --git a/operations/common/seamless-clone/seamless-clone-render.c b/operations/common/seamless-clone/seamless-clone-render.c
index 6c06ab9..b403fb9 100644
--- a/operations/common/seamless-clone/seamless-clone-render.c
+++ b/operations/common/seamless-clone/seamless-clone-render.c
@@ -19,10 +19,10 @@
 
 #ifdef GEGL_CHANT_PROPERTIES
 
-gegl_chant_int (xoff, "xoff", G_MININT, G_MAXINT, 0,
+gegl_chant_int (x, "x", G_MININT, G_MAXINT, 0,
   _("The x offset to apply to the paste"))
 
-gegl_chant_int (yoff, "yoff", G_MININT, G_MAXINT, 0,
+gegl_chant_int (y, "y", G_MININT, G_MAXINT, 0,
   _("The y offset to apply to the paste"))
 
 gegl_chant_pointer (prepare, _("prepare"),
@@ -83,7 +83,7 @@ typedef struct {
   GHashTable     *pt2col;
 
   /* Offset to be applied to the paste */
-  gint xoff, yoff;
+  gint x, y;
 } ScColorComputeInfo;
 
 static void
@@ -122,7 +122,7 @@ sc_point_to_color_func (P2tRPoint *point,
 
       gegl_buffer_sample (cci->aux_buf, pt->x, pt->y, NULL, aux_c, format, GEGL_INTERPOLATION_NEAREST);
       /* Sample the BG with the offset */
-      gegl_buffer_sample (cci->input_buf, pt->x + cci->xoff, pt->y + cci->yoff, NULL, input_c, format, GEGL_INTERPOLATION_NEAREST);
+      gegl_buffer_sample (cci->input_buf, pt->x + cci->x, pt->y + cci->y, NULL, input_c, format, GEGL_INTERPOLATION_NEAREST);
       
       dest_c[0] += weight * (input_c[0] - aux_c[0]);
       dest_c[1] += weight * (input_c[1] - aux_c[1]);
@@ -164,8 +164,8 @@ process (GeglOperation       *operation,
     }
 
   /* The location of the aux will actually be computed with an offset */
-  aux_rect.x += o->xoff;
-  aux_rect.y += o->yoff;
+  aux_rect.x += o->x;
+  aux_rect.y += o->y;
   
   /* We only need to render the intersection of the mesh bounds and the
    * desired output */
@@ -182,12 +182,12 @@ process (GeglOperation       *operation,
 
   /* In order to sample colors correctly, the sampling function will
    * need to know the offset */
-  cci.xoff = o->xoff;
-  cci.yoff = o->yoff;
+  cci.x = o->x;
+  cci.y = o->y;
 
   /* Render as if there is no offset, since the mesh has no offset */
-  imcfg.min_x = to_render.x - o->xoff;
-  imcfg.min_y = to_render.y - o->yoff;
+  imcfg.min_x = to_render.x - o->x;
+  imcfg.min_y = to_render.y - o->y;
   imcfg.step_x = imcfg.step_y = 1;
   imcfg.x_samples = to_render.width;
   imcfg.y_samples = to_render.height;