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gimp/app/core/gimpdata.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpdata.c
* Copyright (C) 2001 Michael Natterer <mitch@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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <errno.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <glib-object.h>
#include <glib/gstdio.h>
#include "libgimpbase/gimpbase.h"
#ifdef G_OS_WIN32
#include "libgimpbase/gimpwin32-io.h"
#endif
#include "core-types.h"
#include "gimpdata.h"
#include "gimpmarshal.h"
#include "gimp-intl.h"
enum
{
DIRTY,
LAST_SIGNAL
};
static void gimp_data_class_init (GimpDataClass *klass);
static void gimp_data_init (GimpData *data,
GimpDataClass *data_class);
static void gimp_data_finalize (GObject *object);
static void gimp_data_name_changed (GimpObject *object);
static gint64 gimp_data_get_memsize (GimpObject *object,
gint64 *gui_size);
static void gimp_data_real_dirty (GimpData *data);
static guint data_signals[LAST_SIGNAL] = { 0 };
static GimpViewableClass *parent_class = NULL;
GType
gimp_data_get_type (void)
{
static GType data_type = 0;
if (! data_type)
{
static const GTypeInfo data_info =
{
sizeof (GimpDataClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_data_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpData),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_data_init,
};
data_type = g_type_register_static (GIMP_TYPE_VIEWABLE,
"GimpData",
&data_info, 0);
}
return data_type;
}
static void
gimp_data_class_init (GimpDataClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpObjectClass *gimp_object_class = GIMP_OBJECT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
data_signals[DIRTY] =
g_signal_new ("dirty",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpDataClass, dirty),
NULL, NULL,
gimp_marshal_VOID__VOID,
G_TYPE_NONE, 0);
object_class->finalize = gimp_data_finalize;
gimp_object_class->name_changed = gimp_data_name_changed;
gimp_object_class->get_memsize = gimp_data_get_memsize;
klass->dirty = gimp_data_real_dirty;
klass->save = NULL;
klass->get_extension = NULL;
klass->duplicate = NULL;
}
static void
gimp_data_init (GimpData *data,
GimpDataClass *data_class)
{
data->filename = NULL;
data->writable = TRUE;
data->deletable = TRUE;
data->dirty = TRUE;
data->internal = FALSE;
data->freeze_count = 0;
/* look at the passed class pointer, not at GIMP_DATA_GET_CLASS(data)
* here, because the latter is always GimpDataClass itself
*/
if (! data_class->save)
data->writable = FALSE;
}
static void
gimp_data_finalize (GObject *object)
{
GimpData *data = GIMP_DATA (object);
if (data->filename)
{
g_free (data->filename);
data->filename = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_data_name_changed (GimpObject *object)
{
if (GIMP_OBJECT_CLASS (parent_class)->name_changed)
GIMP_OBJECT_CLASS (parent_class)->name_changed (object);
gimp_data_dirty (GIMP_DATA (object));
}
static gint64
gimp_data_get_memsize (GimpObject *object,
gint64 *gui_size)
{
GimpData *data = GIMP_DATA (object);
gint64 memsize = 0;
if (data->filename)
memsize += strlen (data->filename) + 1;
return memsize + GIMP_OBJECT_CLASS (parent_class)->get_memsize (object,
gui_size);
}
static void
gimp_data_real_dirty (GimpData *data)
{
data->dirty = TRUE;
gimp_viewable_invalidate_preview (GIMP_VIEWABLE (data));
}
/**
* gimp_data_save:
* @data: object whose contents are to be saved.
* @error: return location for errors or %NULL
*
* Save the object. If the object is marked as "internal", nothing happens.
* Otherwise, it is saved to disk, using the file name set by
* gimp_data_set_filename(). If the save is successful, the
* object is marked as not dirty. If not, an error message is returned
* using the @error argument.
*
* Returns: %TRUE if the object is internal or the save is successful.
**/
gboolean
gimp_data_save (GimpData *data,
GError **error)
{
gboolean success = FALSE;
g_return_val_if_fail (GIMP_IS_DATA (data), FALSE);
g_return_val_if_fail (data->writable == TRUE, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
if (data->internal)
{
data->dirty = FALSE;
return TRUE;
}
g_return_val_if_fail (data->filename != NULL, FALSE);
if (GIMP_DATA_GET_CLASS (data)->save)
success = GIMP_DATA_GET_CLASS (data)->save (data, error);
if (success)
data->dirty = FALSE;
return success;
}
/**
* gimp_data_dirty:
* @data: a #GimpData object.
*
* Marks @data as dirty. Unless the object is frozen, this causes
* its preview to be invalidated, and emits a "dirty" signal. If the
* object is frozen, the function has no effect.
**/
void
gimp_data_dirty (GimpData *data)
{
g_return_if_fail (GIMP_IS_DATA (data));
if (data->freeze_count == 0)
g_signal_emit (data, data_signals[DIRTY], 0);
}
/**
* gimp_data_freeze:
* @data: a #GimpData object.
*
* Increments the freeze count for the object. A positive freeze count
* prevents the object from being treated as dirty. Any call to this
* function must be followed eventually by a call to gimp_data_thaw().
**/
void
gimp_data_freeze (GimpData *data)
{
g_return_if_fail (GIMP_IS_DATA (data));
data->freeze_count++;
}
/**
* gimp_data_thaw:
* @data: a #GimpData object.
*
* Decrements the freeze count for the object. If the freeze count
* drops to zero, the object is marked as dirty, and the "dirty"
* signal is emitted. It is an error to call this function without
* having previously called gimp_data_freeze().
**/
void
gimp_data_thaw (GimpData *data)
{
g_return_if_fail (GIMP_IS_DATA (data));
g_return_if_fail (data->freeze_count > 0);
data->freeze_count--;
if (data->freeze_count == 0)
gimp_data_dirty (data);
}
/**
* gimp_data_delete_from_disk:
* @data: a #GimpData object.
* @error: return location for errors or %NULL
*
* Deletes the object from disk. If the object is marked as "internal",
* nothing happens. Otherwise, if the file exists whose name has been
* set by gimp_data_set_filename(), it is deleted. Obviously this is
* a potentially dangerous function, which should be used with care.
*
* Returns: %TRUE if the object is internal to Gimp, or the deletion is
* successful.
**/
gboolean
gimp_data_delete_from_disk (GimpData *data,
GError **error)
{
g_return_val_if_fail (GIMP_IS_DATA (data), FALSE);
g_return_val_if_fail (data->filename != NULL, FALSE);
g_return_val_if_fail (data->deletable == TRUE, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
if (data->internal)
return TRUE;
if (g_unlink (data->filename) == -1)
{
g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_DELETE,
_("Could not delete '%s': %s"),
gimp_filename_to_utf8 (data->filename), g_strerror (errno));
return FALSE;
}
return TRUE;
}
const gchar *
gimp_data_get_extension (GimpData *data)
{
g_return_val_if_fail (GIMP_IS_DATA (data), NULL);
if (GIMP_DATA_GET_CLASS (data)->get_extension)
return GIMP_DATA_GET_CLASS (data)->get_extension (data);
return NULL;
}
/**
* gimp_data_set_filename:
* @data: A #GimpData object
* @filename: File name to assign to @data.
* @writable: %TRUE if we want to be able to write to this file.
* @deletable: %TRUE if we want to be able to delete this file.
*
* This function assigns a file name to @data, and sets some flags
* according to the properties of the file. If @writable is %TRUE,
* and the user has permission to write or overwrite the requested file
* name, and a "save" method exists for @data's object type, then
* @data is marked as writable.
**/
void
gimp_data_set_filename (GimpData *data,
const gchar *filename,
gboolean writable,
gboolean deletable)
{
g_return_if_fail (GIMP_IS_DATA (data));
g_return_if_fail (filename != NULL);
g_return_if_fail (g_path_is_absolute (filename));
if (data->internal)
return;
if (data->filename)
g_free (data->filename);
data->filename = g_strdup (filename);
data->writable = FALSE;
data->deletable = FALSE;
/* if the data is supposed to be writable or deletable,
* still check if it really is
*/
if (writable || deletable)
{
gchar *dirname = g_path_get_dirname (filename);
if ((access (filename, F_OK) == 0 && /* check if the file exists */
access (filename, W_OK) == 0) || /* and is writable */
(access (filename, F_OK) != 0 && /* OR doesn't exist */
access (dirname, W_OK) == 0)) /* and we can write to its dir */
{
data->writable = writable ? TRUE : FALSE;
data->deletable = deletable ? TRUE : FALSE;
}
g_free (dirname);
/* if we can't save, we are not writable */
if (! GIMP_DATA_GET_CLASS (data)->save)
data->writable = FALSE;
}
}
/**
* gimp_data_create_filename:
* @data: a #Gimpdata object.
* @dest_dir: directory in which to create a file name.
*
* This function creates a unique file name to be used for saving
* a representation of @data in the directory @dest_dir. If the
* user does not have write permission in @dest_dir, then @data
* is marked as "not writable", so you should check on this before
* assuming that @data can be saved.
**/
void
gimp_data_create_filename (GimpData *data,
const gchar *dest_dir)
{
gchar *safename;
gchar *filename;
gchar *fullpath;
gint i;
gint unum = 1;
g_return_if_fail (GIMP_IS_DATA (data));
g_return_if_fail (dest_dir != NULL);
g_return_if_fail (g_path_is_absolute (dest_dir));
safename = g_filename_from_utf8 (gimp_object_get_name (GIMP_OBJECT (data)),
-1, NULL, NULL, NULL);
if (safename[0] == '.')
safename[0] = '-';
for (i = 0; safename[i]; i++)
if (safename[i] == G_DIR_SEPARATOR || g_ascii_isspace (safename[i]))
safename[i] = '-';
filename = g_strconcat (safename, gimp_data_get_extension (data), NULL);
fullpath = g_build_filename (dest_dir, filename, NULL);
g_free (filename);
while (g_file_test (fullpath, G_FILE_TEST_EXISTS))
{
g_free (fullpath);
filename = g_strdup_printf ("%s-%d%s",
safename,
unum++,
gimp_data_get_extension (data));
fullpath = g_build_filename (dest_dir, filename, NULL);
g_free (filename);
}
g_free (safename);
gimp_data_set_filename (data, fullpath, TRUE, TRUE);
g_free (fullpath);
}
/**
* gimp_data_duplicate:
* @data: a #GimpData object
* @stingy_memory_use: if %TRUE, use the disk rather than RAM
* where possible.
*
* Creates a copy of @data, if possible. Only the object data is
* copied: the newly created object is not automatically given an
* object name, file name, preview, etc.
*
* Returns: the newly created copy, or %NULL if @data cannot be copied.
**/
GimpData *
gimp_data_duplicate (GimpData *data,
gboolean stingy_memory_use)
{
g_return_val_if_fail (GIMP_IS_DATA (data), NULL);
if (GIMP_DATA_GET_CLASS (data)->duplicate)
return GIMP_DATA_GET_CLASS (data)->duplicate (data, stingy_memory_use);
return NULL;
}
/**
* gimp_data_make_internal:
* @data: a #GimpData object.
*
* Mark @data as "internal" to Gimp, which means that it will not be
* saved to disk. Note that if you do this, later calls to
* gimp_data_save() and gimp_data_delete_from_disk() will
* automatically return successfully without giving any warning.
**/
void
gimp_data_make_internal (GimpData *data)
{
g_return_if_fail (GIMP_IS_DATA (data));
if (data->filename)
{
g_free (data->filename);
data->filename = NULL;
}
data->internal = TRUE;
data->writable = FALSE;
data->deletable = FALSE;
}
/**
* gimp_data_name_compare:
* @data1: a #GimpData object.
* @data2: another #GimpData object.
*
* Compares the names of the two objects for use in sorting; see
* gimp_object_name_collate() for the method. Objects marked as
* "internal" are considered to come before any objects that are not.
*
* Return value: -1 if @data1 compares before @data2,
* 0 if they compare equal,
* 1 if @data1 compares after @data2.
**/
gint
gimp_data_name_compare (GimpData *data1,
GimpData *data2)
{
/* move the internal objects (like the FG -> BG) gradient) to the top */
if (data1->internal != data2->internal)
return data1->internal ? -1 : 1;
return gimp_object_name_collate ((GimpObject *) data1,
(GimpObject *) data2);
}
/**
* gimp_data_error_quark:
*
* This function is used to implement the GIMP_DATA_ERROR macro. It
* shouldn't be called directly.
*
* Return value: the #GQuark to identify error in the GimpData error domain.
**/
GQuark
gimp_data_error_quark (void)
{
static GQuark quark = 0;
if (! quark)
quark = g_quark_from_static_string ("gimp-data-error-quark");
return quark;
}
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