[gimp/goat-invasion: 202/418] libgimp: add a GeglBuffer backend for plug-ins



commit 427b88a408996a2377cab80988dc6fcac2ca634e
Author: Ãyvind KolÃs <pippin gimp org>
Date:   Thu Mar 22 00:10:43 2012 +0000

    libgimp: add a GeglBuffer backend for plug-ins
    
    Also added an API to get GeglBuffers for drawables, you choose whether you
    get.

 libgimp/Makefile.am             |    8 +-
 libgimp/gimp.h                  |    1 +
 libgimp/gimpdrawable.c          |   29 ++++
 libgimp/gimpdrawable.h          |    5 +-
 libgimp/gimptilebackendplugin.c |  293 +++++++++++++++++++++++++++++++++++++++
 libgimp/gimptilebackendplugin.h |   58 ++++++++
 libgimp/gimptypes.h             |   18 ++--
 plug-ins/common/Makefile.am     |   18 +++
 plug-ins/common/goat-exercise.c |  114 +++++++++++++++
 plug-ins/common/plugin-defs.pl  |    1 +
 10 files changed, 533 insertions(+), 12 deletions(-)
---
diff --git a/libgimp/Makefile.am b/libgimp/Makefile.am
index 6e72896..23cda1f 100644
--- a/libgimp/Makefile.am
+++ b/libgimp/Makefile.am
@@ -62,8 +62,9 @@ AM_CPPFLAGS = \
 	-DGIMP_COMPILATION
 
 INCLUDES = \
-	-I$(top_srcdir)	\
-	$(GTK_CFLAGS)	\
+	-I$(top_srcdir)   \
+	$(GTK_CFLAGS)     \
+	$(GEGL_CFLAGS)    \
 	-I$(includedir)
 
 lib_LTLIBRARIES = libgimp-2.0.la libgimpui-2.0.la
@@ -229,6 +230,8 @@ libgimp_2_0_la_sources = \
 	gimpselection.h		\
 	gimptile.c		\
 	gimptile.h		\
+	gimptilebackendplugin.c \
+	gimptilebackendplugin.h \
 	gimpunitcache.c		\
 	gimpunitcache.h		\
 	gimpvectors.c		\
@@ -368,6 +371,7 @@ libgimp_2_0_la_LIBADD = \
 	$(libgimpcolor)		\
 	$(libgimpbase)		\
 	$(CAIRO_LIBS)		\
+	$(GEGL_LIBS)		\
 	$(GDK_PIXBUF_LIBS)	\
 	$(RT_LIBS)
 
diff --git a/libgimp/gimp.h b/libgimp/gimp.h
index ab054e4..f6ae86a 100644
--- a/libgimp/gimp.h
+++ b/libgimp/gimp.h
@@ -22,6 +22,7 @@
 #define __GIMP_H__
 
 #include <cairo.h>
+#include <gegl.h>
 #include <gdk-pixbuf/gdk-pixbuf.h>
 
 #include <libgimpbase/gimpbase.h>
diff --git a/libgimp/gimpdrawable.c b/libgimp/gimpdrawable.c
index 68e80d5..df3162e 100644
--- a/libgimp/gimpdrawable.c
+++ b/libgimp/gimpdrawable.c
@@ -23,6 +23,7 @@
 #undef GIMP_DISABLE_DEPRECATED
 #include "gimp.h"
 
+#include "gimptilebackendplugin.h"
 
 #define TILE_WIDTH  gimp_tile_width()
 #define TILE_HEIGHT gimp_tile_height()
@@ -645,3 +646,31 @@ gimp_drawable_attach_new_parasite (gint32          drawable_ID,
 
   return success;
 }
+
+
+GeglBuffer *
+gimp_drawable_get_buffer (gint32 drawable_ID)
+{
+  GeglBuffer      *buffer;
+  GimpDrawable    *drawable;
+  GeglTileBackend *backend;
+  drawable = gimp_drawable_get (drawable_ID);
+  backend = gimp_tile_backend_plugin_new (drawable, FALSE);
+  buffer = gegl_buffer_new_for_backend (NULL, backend);
+  g_object_unref (backend);
+  return buffer;
+}
+
+
+GeglBuffer *
+gimp_drawable_get_shadow_buffer (gint32 drawable_ID)
+{
+  GeglBuffer      *buffer;
+  GimpDrawable    *drawable;
+  GeglTileBackend *backend;
+  drawable = gimp_drawable_get (drawable_ID);
+  backend = gimp_tile_backend_plugin_new (drawable, TRUE);
+  buffer = gegl_buffer_new_for_backend (NULL, backend);
+  g_object_unref (backend);
+  return buffer;
+}
diff --git a/libgimp/gimpdrawable.h b/libgimp/gimpdrawable.h
index 98045d2..c2fb6ef 100644
--- a/libgimp/gimpdrawable.h
+++ b/libgimp/gimpdrawable.h
@@ -29,7 +29,6 @@ G_BEGIN_DECLS
 
 /* For information look into the C source or the html documentation */
 
-
 struct _GimpDrawable
 {
   gint32    drawable_id;   /* drawable ID */
@@ -43,6 +42,10 @@ struct _GimpDrawable
 };
 
 
+GeglBuffer   * gimp_drawable_get_buffer             (gint32         drawable_ID);
+GeglBuffer   * gimp_drawable_get_shadow_buffer      (gint32         drawable_ID);
+
+
 GimpDrawable * gimp_drawable_get                    (gint32         drawable_ID);
 void           gimp_drawable_detach                 (GimpDrawable  *drawable);
 void           gimp_drawable_flush                  (GimpDrawable  *drawable);
diff --git a/libgimp/gimptilebackendplugin.c b/libgimp/gimptilebackendplugin.c
new file mode 100644
index 0000000..8528eec
--- /dev/null
+++ b/libgimp/gimptilebackendplugin.c
@@ -0,0 +1,293 @@
+/* gimptilebackendtilemanager.c
+ * Copyright (C) 2012 Ãyvind KolÃs <pippin gimp org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <gegl.h>
+#include "gimp.h"
+#include "gimptilebackendplugin.h"
+
+#define TILE_WIDTH  gimp_tile_width()
+#define TILE_HEIGHT gimp_tile_width()
+
+struct _GimpTileBackendPluginPrivate
+{
+  GimpDrawable *drawable;
+  gboolean      shadow;
+  int           mul;
+};
+
+static int gimp_gegl_tile_mul (void)
+{
+  static int mul = 2;
+  static gboolean inited = 0;
+  if (G_LIKELY (inited))
+    return mul;
+  inited = 1;
+  if (g_getenv ("GIMP_GEGL_TILE_MUL"))
+    mul = atoi (g_getenv ("GIMP_GEGL_TILE_MUL"));
+  if (mul < 1)
+    mul = 1;
+  return mul;
+}
+
+static const Babl *get_format (gint32 drawable_ID);
+static const Babl *get_format (gint32 drawable_ID)
+{
+  gint32 image_ID = gimp_item_get_image (drawable_ID);
+  switch (gimp_drawable_type (drawable_ID))
+    {
+      case GIMP_RGB_IMAGE:  return babl_format ("RGB u8");
+      case GIMP_RGBA_IMAGE: return babl_format ("RGBA u8");
+      case GIMP_GRAY_IMAGE:  return babl_format ("Y u8");
+      case GIMP_GRAYA_IMAGE: return babl_format ("YA u8");
+      case GIMP_INDEXED_IMAGE:
+      case GIMP_INDEXEDA_IMAGE:
+        {
+          const Babl *pala, *pal;
+          gint    ncols;
+          guchar *cmap = gimp_image_get_colormap (image_ID, &ncols);
+          babl_new_palette (NULL, &pal, &pala);
+          babl_palette_set_palette (pal, babl_format ("RGB u8"),
+                                    cmap, ncols);
+          g_free (cmap);
+          if (gimp_drawable_type (drawable_ID) == GIMP_INDEXEDA_IMAGE)
+            return pala;
+          return pal;
+        }
+    }
+  return NULL;
+}
+
+static void     gimp_tile_backend_plugin_finalize (GObject         *object);
+static gpointer gimp_tile_backend_plugin_command  (GeglTileSource  *tile_store,
+                                                   GeglTileCommand  command,
+                                                   gint             x,
+                                                   gint             y,
+                                                   gint             z,
+                                                   gpointer         data);
+
+static void       gimp_tile_write_mul (GimpTileBackendPlugin *backend_plugin,
+                                       gint                        x,
+                                       gint                        y,
+                                       guchar                     *source);
+
+static GeglTile * gimp_tile_read_mul (GimpTileBackendPlugin *backend_plugin,
+                                      gint                        x,
+                                      gint                        y);
+
+G_DEFINE_TYPE (GimpTileBackendPlugin, gimp_tile_backend_plugin,
+               GEGL_TYPE_TILE_BACKEND)
+
+#define parent_class gimp_tile_backend_plugin_parent_class
+
+
+static void
+gimp_tile_backend_plugin_class_init (GimpTileBackendPluginClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->finalize = gimp_tile_backend_plugin_finalize;
+
+  g_type_class_add_private (klass, sizeof (GimpTileBackendPluginPrivate));
+  gimp_tile_cache_size (1024);
+}
+
+static void
+gimp_tile_backend_plugin_init (GimpTileBackendPlugin *backend)
+{
+  GeglTileSource *source = GEGL_TILE_SOURCE (backend);
+
+  backend->priv = G_TYPE_INSTANCE_GET_PRIVATE (backend,
+                                               GIMP_TYPE_TILE_BACKEND_PLUGIN,
+                                               GimpTileBackendPluginPrivate);
+
+  source->command = gimp_tile_backend_plugin_command;
+}
+
+static void
+gimp_tile_backend_plugin_finalize (GObject *object)
+{
+  GimpTileBackendPlugin *backend = GIMP_TILE_BACKEND_PLUGIN (object);
+
+  if (backend->priv->drawable) /* This also causes a flush */
+     gimp_drawable_detach (backend->priv->drawable);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static gpointer
+gimp_tile_backend_plugin_command (GeglTileSource  *tile_store,
+                                        GeglTileCommand  command,
+                                        gint             x,
+                                        gint             y,
+                                        gint             z,
+                                        gpointer         data)
+{
+  GimpTileBackendPlugin *backend_plugin;
+
+  backend_plugin = GIMP_TILE_BACKEND_PLUGIN (tile_store);
+
+  switch (command)
+    {
+    case GEGL_TILE_GET:
+      return gimp_tile_read_mul (backend_plugin, x, y);
+    case GEGL_TILE_SET:
+      gimp_tile_write_mul (backend_plugin, x, y, gegl_tile_get_data (data));
+      gegl_tile_mark_as_stored (data);
+      return NULL;
+    default:
+      g_assert (command < GEGL_TILE_LAST_COMMAND && command >= 0);
+    }
+
+  return NULL;
+}
+
+static GeglTile *
+gimp_tile_read_mul (GimpTileBackendPlugin *backend_plugin,
+                    gint                        x,
+                    gint                        y)
+{
+  GimpTileBackendPluginPrivate *priv = backend_plugin->priv;
+  GeglTileBackend            *backend;
+  GeglTile *tile;
+  gint      tile_size;
+  int       u, v;
+  int       mul = priv->mul;
+  unsigned char *tile_data;
+
+  x *= mul;
+  y *= mul;
+
+  backend    = GEGL_TILE_BACKEND (backend_plugin);
+  tile_size  = gegl_tile_backend_get_tile_size (backend);
+  tile       = gegl_tile_new (tile_size);
+  tile_data  = gegl_tile_get_data (tile);
+
+  for (u = 0; u < mul; u++)
+    for (v = 0; v < mul; v++)
+      {
+        GimpTile     *gimp_tile;
+
+        if (x + u >= priv->drawable->ntile_cols ||
+            y + v >= priv->drawable->ntile_rows)
+          continue;
+        
+        gimp_tile = gimp_drawable_get_tile (priv->drawable,
+                                            priv->shadow,
+                                            y+v, x+u);
+        gimp_tile_ref (gimp_tile);
+          {
+            gint ewidth           = gimp_tile->ewidth;
+            gint eheight          = gimp_tile->eheight;
+            gint bpp              = gimp_tile->bpp;
+            gint tile_stride      = mul * TILE_WIDTH * bpp;
+            gint gimp_tile_stride = ewidth * bpp;
+            gint row;
+
+            for (row = 0; row < eheight; row++)
+              {
+                memcpy (tile_data + (row + TILE_HEIGHT * v) *
+                        tile_stride + u * TILE_WIDTH * bpp,
+                        ((char*)gimp_tile->data) + row * gimp_tile_stride,
+                        gimp_tile_stride);
+              }
+          }
+        gimp_tile_unref (gimp_tile, FALSE);
+      }
+
+  return tile;
+}
+
+static void
+gimp_tile_write_mul (GimpTileBackendPlugin *backend_plugin,
+                     gint                   x,
+                     gint                   y,
+                     guchar                *source)
+{
+  GimpTileBackendPluginPrivate *priv = backend_plugin->priv;
+  int   u, v;
+  int   mul = priv->mul;
+
+  if (!priv->shadow)
+    return;
+
+  x *= mul;
+  y *= mul;
+
+  for (v = 0; v < mul; v++)
+    for (u = 0; u < mul; u++)
+    {
+      GimpTile *gimp_tile;
+
+      if (x + u >= priv->drawable->ntile_cols ||
+          y + v >= priv->drawable->ntile_rows)
+        continue;
+
+      gimp_tile = gimp_drawable_get_tile (priv->drawable,
+                                          priv->shadow,
+                                          y+v, x+u);
+      gimp_tile_ref (gimp_tile);
+      {
+        gint ewidth           = gimp_tile->ewidth;
+        gint eheight          = gimp_tile->eheight;
+        gint bpp              = gimp_tile->bpp;
+        gint tile_stride      = mul * TILE_WIDTH * bpp;
+        gint gimp_tile_stride = ewidth * bpp;
+        gint row;
+
+        for (row = 0; row < eheight; row++)
+          memcpy (((char*)gimp_tile->data) + row * gimp_tile_stride,
+                  source + (row + v * TILE_HEIGHT) *
+                            tile_stride + u * TILE_WIDTH * bpp,
+                  gimp_tile_stride);
+      }
+      gimp_tile_unref (gimp_tile, TRUE);
+    }
+}
+
+GeglTileBackend *
+gimp_tile_backend_plugin_new (GimpDrawable *drawable,
+                              gint          shadow)
+{
+  const Babl                   *format;
+  GeglTileBackend              *ret;
+  GimpTileBackendPlugin        *backend_plugin;
+  GimpTileBackendPluginPrivate *priv;
+
+  gint             width  = drawable->width;
+  gint             height = drawable->height;
+  gint             mul    = gimp_gegl_tile_mul ();
+  GeglRectangle    rect   = { 0, 0, width, height};
+
+  format = get_format (drawable->drawable_id);
+
+  ret = g_object_new (GIMP_TYPE_TILE_BACKEND_PLUGIN,
+                      "tile-width",  TILE_WIDTH  * mul,
+                      "tile-height", TILE_HEIGHT * mul,
+                      "format",      format,
+                      NULL);
+
+  backend_plugin = GIMP_TILE_BACKEND_PLUGIN (ret);
+  priv = backend_plugin->priv;
+  priv->drawable = drawable;
+  priv->mul = mul;
+  priv->shadow = shadow;
+
+  gegl_tile_backend_set_extent (ret, &rect);
+  return ret;
+}
diff --git a/libgimp/gimptilebackendplugin.h b/libgimp/gimptilebackendplugin.h
new file mode 100644
index 0000000..a887b31
--- /dev/null
+++ b/libgimp/gimptilebackendplugin.h
@@ -0,0 +1,58 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimptilebackendtilemanager.h
+ * Copyright (C) 2011 Ãyvind KolÃs <pippin gimp org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_TILE_BACKEND_PLUGIN_H__
+#define __GIMP_TILE_BACKEND_PLUGIN_H__
+
+#include <gegl-buffer-backend.h>
+
+G_BEGIN_DECLS
+
+#define GIMP_TYPE_TILE_BACKEND_PLUGIN            (gimp_tile_backend_plugin_get_type ())
+#define GIMP_TILE_BACKEND_PLUGIN(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_TILE_BACKEND_PLUGIN, GimpTileBackendPlugin))
+#define GIMP_TILE_BACKEND_PLUGIN_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_TILE_BACKEND_PLUGIN, GimpTileBackendPluginClass))
+#define GIMP_IS_TILE_BACKEND_PLUGIN(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_TILE_BACKEND_PLUGIN))
+#define GIMP_IS_TILE_BACKEND_PLUGIN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_TILE_BACKEND_PLUGIN))
+#define GIMP_TILE_BACKEND_PLUGIN_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_TILE_BACKEND_PLUGIN, GimpTileBackendPluginClass))
+
+
+typedef struct _GimpTileBackendPluginClass   GimpTileBackendPluginClass;
+typedef struct _GimpTileBackendPluginPrivate GimpTileBackendPluginPrivate;
+
+struct _GimpTileBackendPlugin
+{
+  GeglTileBackend  parent_instance;
+
+  GimpTileBackendPluginPrivate *priv;
+};
+
+struct _GimpTileBackendPluginClass
+{
+  GeglTileBackendClass parent_class;
+};
+
+GType             gimp_tile_backend_plugin_get_type (void) G_GNUC_CONST;
+
+GeglTileBackend * gimp_tile_backend_plugin_new      (GimpDrawable *drawable,
+                                                     gint          shadow);
+
+G_END_DECLS
+
+#endif /* __GIMP_TILE_BACKEND_plugin_H__ */
diff --git a/libgimp/gimptypes.h b/libgimp/gimptypes.h
index 97958f6..b371146 100644
--- a/libgimp/gimptypes.h
+++ b/libgimp/gimptypes.h
@@ -28,15 +28,15 @@ G_BEGIN_DECLS
 /* For information look into the html documentation */
 
 
-typedef struct _GimpPlugInInfo  GimpPlugInInfo;
-typedef struct _GimpTile        GimpTile;
-typedef struct _GimpDrawable    GimpDrawable;
-typedef struct _GimpPixelRgn    GimpPixelRgn;
-typedef struct _GimpParamDef    GimpParamDef;
-typedef struct _GimpParamRegion GimpParamRegion;
-typedef union  _GimpParamData   GimpParamData;
-typedef struct _GimpParam       GimpParam;
-
+typedef struct _GimpPlugInInfo        GimpPlugInInfo;
+typedef struct _GimpTile              GimpTile;
+typedef struct _GimpDrawable          GimpDrawable;
+typedef struct _GimpPixelRgn          GimpPixelRgn;
+typedef struct _GimpParamDef          GimpParamDef;
+typedef struct _GimpParamRegion       GimpParamRegion;
+typedef union  _GimpParamData         GimpParamData;
+typedef struct _GimpParam             GimpParam;
+typedef struct _GimpTileBackendPlugin GimpTileBackendPlugin;
 
 G_END_DECLS
 
diff --git a/plug-ins/common/Makefile.am b/plug-ins/common/Makefile.am
index ac40506..aafbbdd 100644
--- a/plug-ins/common/Makefile.am
+++ b/plug-ins/common/Makefile.am
@@ -40,6 +40,7 @@ EXTRA_DIST = \
 INCLUDES = \
 	-I$(top_srcdir)	\
 	$(GTK_CFLAGS)	\
+	$(GEGL_CFLAGS)	\
 	-I$(includedir)
 
 libexec_PROGRAMS = \
@@ -127,6 +128,7 @@ libexec_PROGRAMS = \
 	film \
 	filter-pack \
 	fractal-trace \
+	goat-exercise \
 	gradient-map \
 	grid \
 	guillotine \
@@ -2263,6 +2265,22 @@ semi_flatten_LDADD = \
 	$(INTLLIBS)		\
 	$(semi_flatten_RC)
 
+
+goat_exercise_SOURCES = \
+	goat-exercise.c
+
+goat_exercise_LDADD = \
+	$(libgimp)		\
+	$(libgimpmath)		\
+	$(libgimpconfig)	\
+	$(libgimpcolor)		\
+	$(libgimpbase)		\
+	$(CAIRO_LIBS)		\
+	$(GDK_PIXBUF_LIBS)	\
+	$(RT_LIBS)		\
+	$(INTLLIBS)		\
+	$(goat_excercise_RC)
+
 sharpen_SOURCES = \
 	sharpen.c
 
diff --git a/plug-ins/common/goat-exercise.c b/plug-ins/common/goat-exercise.c
new file mode 100644
index 0000000..8ab50d3
--- /dev/null
+++ b/plug-ins/common/goat-exercise.c
@@ -0,0 +1,114 @@
+/*
+ *  Goat exercise plug-in by Ãyvind KolÃs, pippin gimp org
+ */
+
+/* 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+#include <libgimp/gimp.h>
+#include "libgimp/stdplugins-intl.h"
+
+#define PLUG_IN_PROC "plug-in-goat-exercise"
+
+/* Declare local functions.
+ */
+static void   query       (void);
+static void   run         (const gchar      *name,
+                           gint              nparams,
+                           const GimpParam  *param,
+                           gint             *nreturn_vals,
+                           GimpParam       **return_vals);
+
+const GimpPlugInInfo PLUG_IN_INFO =
+{
+  NULL,  /* init_proc  */
+  NULL,  /* quit_proc  */
+  query, /* query_proc */
+  run,   /* run_proc   */
+};
+
+MAIN ()
+
+static void
+query (void)
+{
+  static const GimpParamDef args[] =
+  {
+    { GIMP_PDB_INT32,    "run-mode", "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
+    { GIMP_PDB_IMAGE,    "image",    "Input image (unused)"         },
+    { GIMP_PDB_DRAWABLE, "drawable", "Input drawable"               }
+  };
+
+  gimp_install_procedure (PLUG_IN_PROC,
+                          N_("Exercise a goat"),
+                          "takes a goat for a walk",
+                          "Ãyvind KOlÃs <pippinp gimp org>",
+                          "Ãyvind KOlÃs <pippinp gimp org>",
+                          "21march 2012",
+                          N_("Goat-exercise"),
+                          "RGB*, INDEXED*, GRAY*",
+                          GIMP_PLUGIN,
+                          G_N_ELEMENTS (args), 0,
+                          args, NULL);
+
+  gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/");
+}
+
+static void commit_shadow (gint32 drawable_id)
+{
+  GimpDrawable *drawable = gimp_drawable_get (drawable_id);
+  gimp_drawable_merge_shadow (drawable_id, TRUE);
+  gimp_drawable_update (drawable_id, 0, 0, drawable->width, drawable->height);
+  gimp_drawable_detach (drawable);
+}
+
+static void
+run (const gchar      *name,
+     gint              nparams,
+     const GimpParam  *param,
+     gint             *nreturn_vals,
+     GimpParam       **return_vals)
+{
+  static GimpParam   values[1];
+  GimpPDBStatusType  status = GIMP_PDB_SUCCESS;
+  gint32             drawable_id;
+  GeglBuffer        *buffer;
+  GeglBuffer        *shadow_buffer;
+
+  *nreturn_vals = 1;
+  *return_vals = values;
+
+  gegl_init (NULL, NULL);
+
+  values[0].type          = GIMP_PDB_STATUS;
+  values[0].data.d_status = status;
+
+  INIT_I18N();
+
+  drawable_id = param[2].data.d_drawable;
+  buffer = gimp_drawable_get_buffer (drawable_id);
+  shadow_buffer = gimp_drawable_get_shadow_buffer (drawable_id);
+  gegl_render_op (buffer, shadow_buffer, "gegl:unsharp-mask", NULL);
+
+  g_object_unref (shadow_buffer);
+  g_object_unref (buffer);
+  commit_shadow (drawable_id); /* the buffer first needs to be unreffed, so it is
+                                  in a detached state */
+  
+  gimp_displays_flush ();
+  values[0].data.d_status = status;
+  gegl_exit ();
+}
diff --git a/plug-ins/common/plugin-defs.pl b/plug-ins/common/plugin-defs.pl
index f623235..03e9422 100644
--- a/plug-ins/common/plugin-defs.pl
+++ b/plug-ins/common/plugin-defs.pl
@@ -83,6 +83,7 @@
     'film' => { ui => 1 },
     'filter-pack' => { ui => 1 },
     'fractal-trace' => { ui => 1 },
+    'goat-exercise' => {},
     'gradient-map' => {},
     'grid' => { ui => 1 },
     'guillotine' => {},



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