/* This file is an image processing operation for GEGL
*
* GEGL is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* GEGL 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2006 Øyvind Kolås <pippin@gimp.org>
*/
#include "config.h"
#include <stdlib.h>
#include <glib/gi18n-lib.h>
#ifdef GEGL_CHANT_PROPERTIES
gegl_chant_object(node, _("Node"), _("GeglNode to introspect"))
#else
#define GEGL_CHANT_TYPE_SOURCE
#define GEGL_CHANT_C_FILE "introspect.c"
#include "gegl-chant.h"
#include "gegl-dot.h" /* XXX: internal header file */
#include <stdio.h>
static void
gegl_introspect_load_cache (GeglChantO *op_introspect)
{
GeglBuffer *new_buffer = NULL;
GeglNode *png_load = NULL;
GeglNode *buffer_sink = NULL;
gchar *dot_string = NULL;
gchar *png_filename = NULL;
gchar *dot_filename = NULL;
gchar *dot_cmd = NULL;
if (op_introspect->chant_data)
return;
/* Construct temp filenames */
dot_filename = g_build_filename (g_get_tmp_dir (), "gegl-introspect.dot", NULL);
png_filename = g_build_filename (g_get_tmp_dir (), "gegl-introspect.png", NULL);
/* Construct the .dot source */
dot_string = gegl_to_dot (GEGL_NODE (op_introspect->node));
g_file_set_contents (dot_filename, dot_string, -1, NULL);
/* Process the .dot to a .png */
dot_cmd = g_strdup_printf ("dot -o %s -Tpng %s", png_filename, dot_filename);
if (system (dot_cmd) == -1)
g_warning ("Error executing GraphViz dot program");
/* Create a graph that loads the png into a GeglBuffer and process
* it
*/
png_load = gegl_node_new_child (NULL,
"operation", "gegl:png-load",
"path", png_filename,
NULL);
buffer_sink = gegl_node_new_child (NULL,
"operation", "gegl:buffer-sink",
"buffer", &new_buffer,
NULL);
gegl_node_link_many (png_load, buffer_sink, NULL);
gegl_node_process (buffer_sink);
op_introspect->chant_data= new_buffer;
/* Cleanup */
g_object_unref (buffer_sink);
g_object_unref (png_load);
g_free (dot_string);
g_free (dot_cmd);
g_free (dot_filename);
g_free (png_filename);
}
static void
gegl_introspect_dispose (GObject *object)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (object);
if (o->chant_data != NULL)
{
g_object_unref (o->chant_data);
o->chant_data = NULL;
}
G_OBJECT_CLASS (gegl_chant_parent_class)->dispose (object);
}
static GeglRectangle
gegl_introspect_get_bounding_box (GeglOperation *operation)
{
GeglRectangle result = {0,0,0,0};
GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
gint width, height;
gegl_introspect_load_cache (o);
g_object_get (o->chant_data, "width", &width,
"height", &height, NULL);
result.width = width;
result.height = height;
return result;
}
static gboolean
gegl_introspect_process (GeglOperation *operation,
GeglOperationContext *context,
const gchar *output_pad,
const GeglRectangle *result,
gint level)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
gegl_introspect_load_cache (o);
/* gegl_operation_context_take_object() takes the reference we have,
* so we must increase it since we want to keep the object
*/
g_object_ref (o->chant_data);
gegl_operation_context_take_object (context, output_pad, G_OBJECT (o->chant_data));
return TRUE;
}
static void
gegl_chant_class_init (GeglChantClass *klass)
{
GObjectClass *object_class;
GeglOperationClass *operation_class;
object_class = G_OBJECT_CLASS (klass);
operation_class = GEGL_OPERATION_CLASS (klass);
object_class->dispose = gegl_introspect_dispose;
operation_class->process = gegl_introspect_process;
operation_class->get_bounding_box = gegl_introspect_get_bounding_box;
gegl_operation_class_set_keys (operation_class,
"name" , "gegl:introspect",
"categories" , "render",
"description", _("GEGL graph visualizer."),
NULL);
}
#endif