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gimp/libgimp/gimploadprocedure.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimploadprocedure.c
* Copyright (C) 2019 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 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 <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gimp.h"
#include "gimploadprocedure.h"
#include "gimppdb_pdb.h"
#include "libgimp-intl.h"
/**
* GimpLoadProcedure:
*
* A [class@Procedure] subclass that makes it easier to write file load
* procedures.
*
* It automatically adds the standard
*
* ( [enum@RunMode], [iface@Gio.File] )
*
* arguments and the standard
*
* ( [class@Image] )
*
* return value of a load procedure. It is possible to add additional
* arguments.
*
* When invoked via [method@Procedure.run], it unpacks these standard
* arguments and calls @run_func which is a [callback@RunImageFunc]. The
* "args" [struct@ValueArray] of [callback@RunImageFunc] only contains
* additionally added arguments.
*/
struct _GimpLoadProcedurePrivate
{
GimpRunLoadFunc run_func;
gpointer run_data;
GDestroyNotify run_data_destroy;
gboolean handles_raw;
gchar *thumbnail_proc;
};
static void gimp_load_procedure_constructed (GObject *object);
static void gimp_load_procedure_finalize (GObject *object);
static void gimp_load_procedure_install (GimpProcedure *procedure);
static GimpValueArray *
gimp_load_procedure_run (GimpProcedure *procedure,
const GimpValueArray *args);
static GimpProcedureConfig *
gimp_load_procedure_create_config (GimpProcedure *procedure,
GParamSpec **args,
gint n_args);
G_DEFINE_TYPE_WITH_PRIVATE (GimpLoadProcedure, gimp_load_procedure,
GIMP_TYPE_FILE_PROCEDURE)
#define parent_class gimp_load_procedure_parent_class
static void
gimp_load_procedure_class_init (GimpLoadProcedureClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpProcedureClass *procedure_class = GIMP_PROCEDURE_CLASS (klass);
object_class->constructed = gimp_load_procedure_constructed;
object_class->finalize = gimp_load_procedure_finalize;
procedure_class->install = gimp_load_procedure_install;
procedure_class->run = gimp_load_procedure_run;
procedure_class->create_config = gimp_load_procedure_create_config;
}
static void
gimp_load_procedure_init (GimpLoadProcedure *procedure)
{
procedure->priv = gimp_load_procedure_get_instance_private (procedure);
}
static void
gimp_load_procedure_constructed (GObject *object)
{
GimpProcedure *procedure = GIMP_PROCEDURE (object);
G_OBJECT_CLASS (parent_class)->constructed (object);
GIMP_PROC_ARG_FILE (procedure, "file",
"File",
"The file to load",
GIMP_PARAM_READWRITE);
GIMP_PROC_VAL_IMAGE (procedure, "image",
"Image",
"Output image",
TRUE,
GIMP_PARAM_READWRITE);
}
static void
gimp_load_procedure_finalize (GObject *object)
{
GimpLoadProcedure *procedure = GIMP_LOAD_PROCEDURE (object);
if (procedure->priv->run_data_destroy)
procedure->priv->run_data_destroy (procedure->priv->run_data);
g_clear_pointer (&procedure->priv->thumbnail_proc, g_free);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_load_procedure_install (GimpProcedure *procedure)
{
GimpLoadProcedure *load_proc = GIMP_LOAD_PROCEDURE (procedure);
GimpFileProcedure *file_proc = GIMP_FILE_PROCEDURE (procedure);
const gchar *mime_types;
gint priority;
GIMP_PROCEDURE_CLASS (parent_class)->install (procedure);
_gimp_pdb_set_file_proc_load_handler (gimp_procedure_get_name (procedure),
gimp_file_procedure_get_extensions (file_proc),
gimp_file_procedure_get_prefixes (file_proc),
gimp_file_procedure_get_magics (file_proc));
if (gimp_file_procedure_get_handles_remote (file_proc))
_gimp_pdb_set_file_proc_handles_remote (gimp_procedure_get_name (procedure));
mime_types = gimp_file_procedure_get_mime_types (file_proc);
if (mime_types)
_gimp_pdb_set_file_proc_mime_types (gimp_procedure_get_name (procedure),
mime_types);
priority = gimp_file_procedure_get_priority (file_proc);
if (priority != 0)
_gimp_pdb_set_file_proc_priority (gimp_procedure_get_name (procedure),
priority);
if (load_proc->priv->handles_raw)
_gimp_pdb_set_file_proc_handles_raw (gimp_procedure_get_name (procedure));
if (load_proc->priv->thumbnail_proc)
_gimp_pdb_set_file_proc_thumbnail_loader (gimp_procedure_get_name (procedure),
load_proc->priv->thumbnail_proc);
}
#define ARG_OFFSET 2
static GimpValueArray *
gimp_load_procedure_run (GimpProcedure *procedure,
const GimpValueArray *args)
{
GimpLoadProcedure *load_proc = GIMP_LOAD_PROCEDURE (procedure);
GimpValueArray *remaining;
GimpValueArray *return_values;
GimpProcedureConfig *config;
GimpImage *image = NULL;
GimpMetadata *metadata = NULL;
gchar *mimetype = NULL;
GimpMetadataLoadFlags flags = GIMP_METADATA_LOAD_ALL;
GimpPDBStatusType status = GIMP_PDB_EXECUTION_ERROR;
GimpRunMode run_mode;
GFile *file;
gint i;
run_mode = GIMP_VALUES_GET_ENUM (args, 0);
file = GIMP_VALUES_GET_FILE (args, 1);
remaining = gimp_value_array_new (gimp_value_array_length (args) - ARG_OFFSET);
for (i = ARG_OFFSET; i < gimp_value_array_length (args); i++)
{
GValue *value = gimp_value_array_index (args, i);
gimp_value_array_append (remaining, value);
}
config = gimp_procedure_create_config (procedure);
mimetype = (gchar *) gimp_file_procedure_get_mime_types (GIMP_FILE_PROCEDURE (procedure));
if (mimetype != NULL)
{
char *delim;
mimetype = g_strdup (mimetype);
mimetype = g_strstrip (mimetype);
delim = strstr (mimetype, ",");
if (delim)
*delim = '\0';
/* Though docs only writes about the list being comma-separated, our
* code apparently also split by spaces.
*/
delim = strstr (mimetype, " ");
if (delim)
*delim = '\0';
delim = strstr (mimetype, "\t");
if (delim)
*delim = '\0';
metadata = gimp_metadata_load_from_file (file, NULL);
g_free (mimetype);
}
else
{
flags = GIMP_METADATA_LOAD_NONE;
}
if (metadata == NULL)
metadata = gimp_metadata_new ();
return_values = load_proc->priv->run_func (procedure,
run_mode,
file,
metadata, &flags,
config,
load_proc->priv->run_data);
if (return_values != NULL &&
gimp_value_array_length (return_values) > 0 &&
G_VALUE_HOLDS_ENUM (gimp_value_array_index (return_values, 0)))
status = GIMP_VALUES_GET_ENUM (return_values, 0);
gimp_procedure_config_end_run (config, status);
if (status == GIMP_PDB_SUCCESS)
{
if (gimp_value_array_length (return_values) < 2 ||
! GIMP_VALUE_HOLDS_IMAGE (gimp_value_array_index (return_values, 1)))
{
GError *error = NULL;
status = GIMP_PDB_EXECUTION_ERROR;
g_set_error (&error, GIMP_PLUG_IN_ERROR, 0,
_("This file loading plug-in returned SUCCESS as a status without an image. "
"This is a bug in the plug-in code. Contact the plug-in developer."));
gimp_value_array_unref (return_values);
return_values = gimp_procedure_new_return_values (procedure, status, error);
}
else
{
image = GIMP_VALUES_GET_IMAGE (return_values, 1);
}
}
if (image != NULL && metadata != NULL && flags != GIMP_METADATA_LOAD_NONE)
gimp_image_metadata_load_finish (image, NULL, metadata, flags);
/* This is debug printing to help plug-in developers figure out best
* practices.
*/
if (G_OBJECT (config)->ref_count > 1)
g_printerr ("%s: ERROR: the GimpSaveProcedureConfig object was refed "
"by plug-in, it MUST NOT do that!\n", G_STRFUNC);
g_object_unref (config);
g_clear_object (&metadata);
gimp_value_array_unref (remaining);
return return_values;
}
static GimpProcedureConfig *
gimp_load_procedure_create_config (GimpProcedure *procedure,
GParamSpec **args,
gint n_args)
{
if (n_args > ARG_OFFSET)
{
args += ARG_OFFSET;
n_args -= ARG_OFFSET;
}
else
{
args = NULL;
n_args = 0;
}
return GIMP_PROCEDURE_CLASS (parent_class)->create_config (procedure,
args,
n_args);
}
/* public functions */
/**
* gimp_load_procedure_new:
* @plug_in: a #GimpPlugIn.
* @name: the new procedure's name.
* @proc_type: the new procedure's #GimpPDBProcType.
* @run_func: the run function for the new procedure.
* @run_data: user data passed to @run_func.
* @run_data_destroy: (nullable): free function for @run_data, or %NULL.
*
* Creates a new load procedure named @name which will call @run_func
* when invoked.
*
* See gimp_procedure_new() for information about @proc_type.
*
* Returns: (transfer full): a new #GimpProcedure.
*
* Since: 3.0
**/
GimpProcedure *
gimp_load_procedure_new (GimpPlugIn *plug_in,
const gchar *name,
GimpPDBProcType proc_type,
GimpRunLoadFunc run_func,
gpointer run_data,
GDestroyNotify run_data_destroy)
{
GimpLoadProcedure *procedure;
g_return_val_if_fail (GIMP_IS_PLUG_IN (plug_in), NULL);
g_return_val_if_fail (gimp_is_canonical_identifier (name), NULL);
g_return_val_if_fail (proc_type != GIMP_PDB_PROC_TYPE_INTERNAL, NULL);
g_return_val_if_fail (proc_type != GIMP_PDB_PROC_TYPE_EXTENSION, NULL);
g_return_val_if_fail (run_func != NULL, NULL);
procedure = g_object_new (GIMP_TYPE_LOAD_PROCEDURE,
"plug-in", plug_in,
"name", name,
"procedure-type", proc_type,
NULL);
procedure->priv->run_func = run_func;
procedure->priv->run_data = run_data;
procedure->priv->run_data_destroy = run_data_destroy;
return GIMP_PROCEDURE (procedure);
}
/**
* gimp_load_procedure_set_handles_raw:
* @procedure: A load procedure object.
* @handles_raw: The procedure's handles raw flag.
*
* Registers a load procedure as capable of handling raw digital camera loads.
*
* Since: 3.0
**/
void
gimp_load_procedure_set_handles_raw (GimpLoadProcedure *procedure,
gint handles_raw)
{
g_return_if_fail (GIMP_IS_LOAD_PROCEDURE (procedure));
procedure->priv->handles_raw = handles_raw;
}
/**
* gimp_load_procedure_get_handles_raw:
* @procedure: A load procedure object.
*
* Returns the procedure's 'handles raw' flag as set with
* [method@GimpLoadProcedure.set_handles_raw].
*
* Returns: The procedure's 'handles raw' flag.
*
* Since: 3.0
**/
gint
gimp_load_procedure_get_handles_raw (GimpLoadProcedure *procedure)
{
g_return_val_if_fail (GIMP_IS_LOAD_PROCEDURE (procedure), 0);
return procedure->priv->handles_raw;
}
/**
* gimp_load_procedure_set_thumbnail_loader:
* @procedure: A load procedure object.
* @thumbnail_proc: The name of the thumbnail load procedure.
*
* Associates a thumbnail loader with a file load procedure.
*
* Some file formats allow for embedded thumbnails, other file formats
* contain a scalable image or provide the image data in different
* resolutions. A file plug-in for such a format may register a
* special procedure that allows GIMP to load a thumbnail preview of
* the image. This procedure is then associated with the standard
* load procedure using this function.
*
* Since: 3.0
**/
void
gimp_load_procedure_set_thumbnail_loader (GimpLoadProcedure *procedure,
const gchar *thumbnail_proc)
{
g_return_if_fail (GIMP_IS_LOAD_PROCEDURE (procedure));
g_free (procedure->priv->thumbnail_proc);
procedure->priv->thumbnail_proc = g_strdup (thumbnail_proc);
}
/**
* gimp_load_procedure_get_thumbnail_loader:
* @procedure: A load procedure object.
*
* Returns the procedure's thumbnail loader procedure as set with
* [method@GimpLoadProcedure.set_thumbnail_loader].
*
* Returns: The procedure's thumbnail loader procedure
*
* Since: 3.0
**/
const gchar *
gimp_load_procedure_get_thumbnail_loader (GimpLoadProcedure *procedure)
{
g_return_val_if_fail (GIMP_IS_LOAD_PROCEDURE (procedure), NULL);
return procedure->priv->thumbnail_proc;
}
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