1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/* 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
|
