[gimp/soc-2011-warp] gimpoperationwarp: act along the stroke, only size is taken in account for now

[Michael Murà <mmure src gnome org>]

commit 4480dc186eb3853c64d619f6b959aa3696ae3b98
Author: Michael Murà <batolettre gmail com>
Date:   Tue Jun 14 23:50:24 2011 +0200

    gimpoperationwarp: act along the stroke, only size is taken in account for now

 app/gegl/gimpoperationwarp.c |   42 +++++++++++++++++++++++++++---------------
 app/gegl/gimpoperationwarp.h |    2 ++
 2 files changed, 29 insertions(+), 15 deletions(-)
---
diff --git a/app/gegl/gimpoperationwarp.c b/app/gegl/gimpoperationwarp.c
index dc8a917..a83376a 100644
--- a/app/gegl/gimpoperationwarp.c
+++ b/app/gegl/gimpoperationwarp.c
@@ -52,6 +52,9 @@ static gboolean     gimp_operation_warp_process         (GeglOperation       *op
                                                          GeglBuffer          *in_buf,
                                                          GeglBuffer          *out_buf,
                                                          const GeglRectangle *roi);
+void                gimp_operation_warp_affect          (const GeglPathItem  *knot,
+                                                         gpointer             data);
+
 
 G_DEFINE_TYPE (GimpOperationWarp, gimp_operation_warp,
                       GEGL_TYPE_OPERATION_FILTER)
@@ -181,20 +184,35 @@ gimp_operation_warp_process (GeglOperation       *operation,
                              const GeglRectangle *roi)
 {
   GimpOperationWarp   *ow    = GIMP_OPERATION_WARP (operation);
-  GeglBuffer          *buffer;
+
+  ow->buffer = gegl_buffer_dup (in_buf);
+
+  gegl_path_foreach(ow->stroke, gimp_operation_warp_affect, ow);
+
+  gegl_buffer_copy (ow->buffer, roi, out_buf, roi);
+  gegl_buffer_set_extent (out_buf, gegl_buffer_get_extent (in_buf));
+  gegl_buffer_destroy (ow->buffer);
+
+  return TRUE;
+}
+
+void
+gimp_operation_warp_affect (const GeglPathItem *knot,
+                            gpointer            data)
+{
+  GimpOperationWarp   *ow    = GIMP_OPERATION_WARP (data);
+
   GeglBufferIterator  *it;
   Babl                *format;
   gint                 x, y;
-  GeglRectangle        area = {100,
-                               100,
-                               200,
-                               200};
+  GeglRectangle        area = {knot->point->x - 20,
+                               knot->point->y - 20,
+                               ow->size,
+                               ow->size};
 
   format = babl_format_n (babl_type ("float"), 2);
 
-  buffer = gegl_buffer_dup (in_buf);
-
-  it = gegl_buffer_iterator_new (buffer, &area, format, GEGL_BUFFER_READWRITE);
+  it = gegl_buffer_iterator_new (ow->buffer, &area, format, GEGL_BUFFER_READWRITE);
 
   while (gegl_buffer_iterator_next (it))
     {
@@ -221,10 +239,4 @@ gimp_operation_warp_process (GeglOperation       *operation,
             }
         }
     }
-
-  gegl_buffer_copy (buffer, roi, out_buf, roi);
-  gegl_buffer_set_extent (out_buf, gegl_buffer_get_extent (in_buf));
-  gegl_buffer_destroy (buffer);
-
-  return TRUE;
-}
+}
\ No newline at end of file
diff --git a/app/gegl/gimpoperationwarp.h b/app/gegl/gimpoperationwarp.h
index ad4a1a2..4d2fb95 100644
--- a/app/gegl/gimpoperationwarp.h
+++ b/app/gegl/gimpoperationwarp.h
@@ -41,6 +41,8 @@ struct _GimpOperationWarp
   gdouble              strength;
   gdouble              size;
   GeglPath            *stroke;
+
+  GeglBuffer          *buffer; /* used to pass the temporary buffer to the function called by gegl_path_foreach */
 };
 
 struct _GimpOperationWarpClass