[gimp/soc-2011-warp] gimpoperationwarp: implement grow ans shrink behavior

[Michael Murà <mmure src gnome org>]

commit b280ae3853ce549a87ee2358ba368ce2abf0f957
Author: Michael Murà <batolettre gmail com>
Date:   Tue Jun 21 12:23:59 2011 +0200

    gimpoperationwarp: implement grow ans shrink behavior

 app/gegl/gimp-gegl-enums.c   |    4 ++++
 app/gegl/gimp-gegl-enums.h   |    2 ++
 app/gegl/gimpoperationwarp.c |   10 +++++++++-
 3 files changed, 15 insertions(+), 1 deletions(-)
---
diff --git a/app/gegl/gimp-gegl-enums.c b/app/gegl/gimp-gegl-enums.c
index c53ed77..de60ed5 100644
--- a/app/gegl/gimp-gegl-enums.c
+++ b/app/gegl/gimp-gegl-enums.c
@@ -44,12 +44,16 @@ gimp_warp_behavior_get_type (void)
   static const GEnumValue values[] =
   {
     { GIMP_WARP_BEHAVIOR_MOVE, "GIMP_WARP_BEHAVIOR_MOVE", "move" },
+    { GIMP_WARP_BEHAVIOR_GROW, "GIMP_WARP_BEHAVIOR_GROW", "grow" },
+    { GIMP_WARP_BEHAVIOR_SHRINK, "GIMP_WARP_BEHAVIOR_SHRINK", "shrink" },
     { 0, NULL, NULL }
   };
 
   static const GimpEnumDesc descs[] =
   {
     { GIMP_WARP_BEHAVIOR_MOVE, NC_("warp-behavior", "Move pixels"), NULL },
+    { GIMP_WARP_BEHAVIOR_GROW, NC_("warp-behavior", "Grow area"), NULL },
+    { GIMP_WARP_BEHAVIOR_SHRINK, NC_("warp-behavior", "Shrink area"), NULL },
     { 0, NULL, NULL }
   };
 
diff --git a/app/gegl/gimp-gegl-enums.h b/app/gegl/gimp-gegl-enums.h
index 1615be3..7a28b8a 100644
--- a/app/gegl/gimp-gegl-enums.h
+++ b/app/gegl/gimp-gegl-enums.h
@@ -38,6 +38,8 @@ GType gimp_warp_behavior_get_type (void) G_GNUC_CONST;
 typedef enum
 {
   GIMP_WARP_BEHAVIOR_MOVE,        /*< desc="Move pixels"                         >*/
+  GIMP_WARP_BEHAVIOR_GROW,        /*< desc="Grow area"                           >*/
+  GIMP_WARP_BEHAVIOR_SHRINK       /*< desc="Shrink area"                         >*/
 } GimpWarpBehavior;
 
 #endif /* __GIMP_GEGL_ENUMS_H__ */
diff --git a/app/gegl/gimpoperationwarp.c b/app/gegl/gimpoperationwarp.c
index 1ad0158..a7d0766 100644
--- a/app/gegl/gimpoperationwarp.c
+++ b/app/gegl/gimpoperationwarp.c
@@ -210,7 +210,7 @@ gimp_operation_warp_process (GeglOperation       *operation,
   ow->buffer = gegl_buffer_dup (in_buf);
 
   /* Compute the stamps location */
-  length = (gulong) gegl_path_get_length (ow->stroke);
+  length = (gulong) gegl_path_get_length (ow->stroke) + 1;
 
   x = g_slice_alloc (length * sizeof(gdouble));
   y = g_slice_alloc (length * sizeof(gdouble));
@@ -285,6 +285,14 @@ gimp_operation_warp_stamp (GimpOperationWarp *ow,
                 coords[0] += influence * (ow->last_x - x);
                 coords[1] += influence * (ow->last_y - y);
                 break;
+              case GIMP_WARP_BEHAVIOR_GROW:
+                coords[0] -= influence * (x_iter - x) / ow->size;
+                coords[1] -= influence * (y_iter - y) / ow->size;
+                break;
+              case GIMP_WARP_BEHAVIOR_SHRINK:
+                coords[0] += influence * (x_iter - x) / ow->size;
+                coords[1] += influence * (y_iter - y) / ow->size;
+                break;
             }
 
           coords += 2;