/* 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 <glib/gi18n-lib.h>
#ifdef GEGL_CHANT_PROPERTIES
gegl_chant_string(path, _("File"), "", _("a GeglBuffer on disk to open"))
#else
#define GEGL_CHANT_TYPE_SOURCE
#define GEGL_CHANT_C_FILE "open-buffer.c"
#include "gegl-chant.h"
static void buffer_changed (GeglBuffer *buffer,
const GeglRectangle *rect,
gpointer userdata)
{
gegl_operation_invalidate (GEGL_OPERATION (userdata), rect, FALSE);
}
static GeglBuffer *ensure_buffer (GeglOperation *operation)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
GeglBuffer *buffer = o->chant_data;
if (buffer)
return buffer;
if (!buffer)
{
buffer = gegl_buffer_open (o->path);
o->chant_data = buffer;
}
g_signal_connect (buffer, "changed",
G_CALLBACK(buffer_changed), operation);
return buffer;
}
static GeglRectangle
get_bounding_box (GeglOperation *operation)
{
GeglRectangle result = {0,0,0,0};
GeglBuffer *buffer = ensure_buffer (operation);
result = *gegl_buffer_get_extent (GEGL_BUFFER (buffer));
return result;
}
static GeglRectangle
get_cached_region (GeglOperation *self,
const GeglRectangle *roi)
{
return get_bounding_box (self);
}
static gboolean
process (GeglOperation *operation,
GeglOperationContext *context,
const gchar *output_pad,
const GeglRectangle *result,
gint level)
{
GeglBuffer *buffer = ensure_buffer (operation);
if (buffer)
{
g_object_ref (buffer); /* Add an extra reference, since
* gegl_operation_set_data is
* stealing one.
*/
/* override core behaviour, by resetting the buffer in the operation_context */
gegl_operation_context_take_object (context, "output", G_OBJECT (buffer));
return TRUE;
}
return FALSE;
}
static void
dispose (GObject *object)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (object);
GeglBuffer *buffer = o->chant_data;
if (buffer)
{
g_object_unref (buffer);
o->chant_data = NULL;
}
G_OBJECT_CLASS (gegl_chant_parent_class)->dispose (object);
}
static void
gegl_chant_class_init (GeglChantClass *klass)
{
GeglOperationClass *operation_class;
operation_class = GEGL_OPERATION_CLASS (klass);
G_OBJECT_CLASS (klass)->dispose = dispose;
operation_class->process = process;
operation_class->get_bounding_box = get_bounding_box;
operation_class->get_cached_region = get_cached_region;
gegl_operation_class_set_keys (operation_class,
"name" , "gegl:open-buffer",
"categories" , "input",
"description", _("A source that uses an on-disk GeglBuffer."),
NULL);
operation_class->no_cache = TRUE;
}
#endif