PIKApp/libpika/pikathumbnailprocedure.c

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/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* pikathumbnailprocedure.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 "pika.h"
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#include "libpikabase/pikawire.h" /* FIXME kill this include */
#include "pikaplugin-private.h"
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#include "pikathumbnailprocedure.h"
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#include "pikaprocedureconfig-private.h"
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struct _PikaThumbnailProcedurePrivate
{
PikaRunThumbnailFunc run_func;
gpointer run_data;
GDestroyNotify run_data_destroy;
};
static void pika_thumbnail_procedure_constructed (GObject *object);
static void pika_thumbnail_procedure_finalize (GObject *object);
static PikaValueArray *
pika_thumbnail_procedure_run (PikaProcedure *procedure,
const PikaValueArray *args);
static PikaProcedureConfig *
pika_thumbnail_procedure_create_config
(PikaProcedure *procedure,
GParamSpec **args,
gint n_args);
G_DEFINE_TYPE_WITH_PRIVATE (PikaThumbnailProcedure, pika_thumbnail_procedure,
PIKA_TYPE_PROCEDURE)
#define parent_class pika_thumbnail_procedure_parent_class
static void
pika_thumbnail_procedure_class_init (PikaThumbnailProcedureClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaProcedureClass *procedure_class = PIKA_PROCEDURE_CLASS (klass);
object_class->constructed = pika_thumbnail_procedure_constructed;
object_class->finalize = pika_thumbnail_procedure_finalize;
procedure_class->run = pika_thumbnail_procedure_run;
procedure_class->create_config = pika_thumbnail_procedure_create_config;
}
static void
pika_thumbnail_procedure_init (PikaThumbnailProcedure *procedure)
{
procedure->priv = pika_thumbnail_procedure_get_instance_private (procedure);
}
static void
pika_thumbnail_procedure_constructed (GObject *object)
{
PikaProcedure *procedure = PIKA_PROCEDURE (object);
G_OBJECT_CLASS (parent_class)->constructed (object);
PIKA_PROC_ARG_FILE (procedure, "file",
"File",
"The file to load the thumbnail from",
PIKA_PARAM_READWRITE);
PIKA_PROC_ARG_INT (procedure, "thumb-size",
"Thumb Size",
"Preferred thumbnail size",
16, 2014, 256,
PIKA_PARAM_READWRITE);
PIKA_PROC_VAL_IMAGE (procedure, "image",
"Image",
"Thumbnail image",
TRUE,
PIKA_PARAM_READWRITE);
PIKA_PROC_VAL_INT (procedure, "image-width",
"Image width",
"Width of the full-sized image (0 for unknown)",
0, PIKA_MAX_IMAGE_SIZE, 0,
PIKA_PARAM_READWRITE);
PIKA_PROC_VAL_INT (procedure, "image-height",
"Image height",
"Height of the full-sized image (0 for unknown)",
0, PIKA_MAX_IMAGE_SIZE, 0,
PIKA_PARAM_READWRITE);
PIKA_PROC_VAL_ENUM (procedure, "image-type",
"Image type",
"Type of the image",
PIKA_TYPE_IMAGE_TYPE,
PIKA_RGB_IMAGE,
PIKA_PARAM_READWRITE);
PIKA_PROC_VAL_INT (procedure, "num-layers",
"Num layers",
"Number of layers in the image",
1, G_MAXINT, 1,
PIKA_PARAM_READWRITE);
}
static void
pika_thumbnail_procedure_finalize (GObject *object)
{
PikaThumbnailProcedure *procedure = PIKA_THUMBNAIL_PROCEDURE (object);
if (procedure->priv->run_data_destroy)
procedure->priv->run_data_destroy (procedure->priv->run_data);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
#define ARG_OFFSET 2
static PikaValueArray *
pika_thumbnail_procedure_run (PikaProcedure *procedure,
const PikaValueArray *args)
{
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PikaPlugIn *plug_in;
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PikaThumbnailProcedure *thumbnail_proc = PIKA_THUMBNAIL_PROCEDURE (procedure);
PikaValueArray *remaining;
PikaValueArray *return_values;
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PikaProcedureConfig *config;
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GFile *file;
gint size;
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PikaPDBStatusType status = PIKA_PDB_EXECUTION_ERROR;
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gint i;
file = PIKA_VALUES_GET_FILE (args, 0);
size = PIKA_VALUES_GET_INT (args, 1);
remaining = pika_value_array_new (pika_value_array_length (args) - ARG_OFFSET);
for (i = ARG_OFFSET; i < pika_value_array_length (args); i++)
{
GValue *value = pika_value_array_index (args, i);
pika_value_array_append (remaining, value);
}
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config = pika_procedure_create_config (procedure);
_pika_procedure_config_begin_run (config, NULL, PIKA_RUN_NONINTERACTIVE, remaining);
pika_value_array_unref (remaining);
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return_values = thumbnail_proc->priv->run_func (procedure,
file,
size,
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config,
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thumbnail_proc->priv->run_data);
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if (return_values != NULL &&
pika_value_array_length (return_values) > 0 &&
G_VALUE_HOLDS_ENUM (pika_value_array_index (return_values, 0)))
status = PIKA_VALUES_GET_ENUM (return_values, 0);
_pika_procedure_config_end_run (config, status);
/* This is debug printing to help plug-in developers figure out best
* practices.
*/
plug_in = pika_procedure_get_plug_in (procedure);
if (G_OBJECT (config)->ref_count > 1 &&
_pika_plug_in_manage_memory_manually (plug_in))
g_printerr ("%s: ERROR: the PikaThumbnailProcedure config object was refed "
"by plug-in, it MUST NOT do that!\n", G_STRFUNC);
g_object_unref (config);
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return return_values;
}
static PikaProcedureConfig *
pika_thumbnail_procedure_create_config (PikaProcedure *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 PIKA_PROCEDURE_CLASS (parent_class)->create_config (procedure,
args,
n_args);
}
/* public functions */
/**
* pika_thumbnail_procedure_new:
* @plug_in: a #PikaPlugIn.
* @name: the new procedure's name.
* @proc_type: the new procedure's #PikaPDBProcType.
* @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 thumbnail procedure named @name which will call @run_func
* when invoked.
*
* See pika_procedure_new() for information about @proc_type.
*
* #PikaThumbnailProcedure is a #PikaProcedure subclass that makes it easier
* to write file thumbnail procedures.
*
* It automatically adds the standard
*
* (#GFile, size)
*
* arguments and the standard
*
* (#PikaImage, image-width, image-height, #PikaImageType, num-layers)
*
* return value of a thumbnail procedure. It is possible to add
* additional arguments.
*
* When invoked via pika_procedure_run(), it unpacks these standard
* arguments and calls @run_func which is a #PikaRunThumbnailFunc. The
* "args" #PikaValueArray of #PikaRunThumbnailFunc only contains
* additionally added arguments.
*
* #PikaRunThumbnailFunc must pika_value_array_truncate() the returned
* #PikaValueArray to the number of return values it actually uses.
*
* Returns: a new #PikaProcedure.
*
* Since: 3.0
**/
PikaProcedure *
pika_thumbnail_procedure_new (PikaPlugIn *plug_in,
const gchar *name,
PikaPDBProcType proc_type,
PikaRunThumbnailFunc run_func,
gpointer run_data,
GDestroyNotify run_data_destroy)
{
PikaThumbnailProcedure *procedure;
g_return_val_if_fail (PIKA_IS_PLUG_IN (plug_in), NULL);
g_return_val_if_fail (pika_is_canonical_identifier (name), NULL);
g_return_val_if_fail (proc_type != PIKA_PDB_PROC_TYPE_INTERNAL, NULL);
g_return_val_if_fail (proc_type != PIKA_PDB_PROC_TYPE_EXTENSION, NULL);
g_return_val_if_fail (run_func != NULL, NULL);
procedure = g_object_new (PIKA_TYPE_THUMBNAIL_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 PIKA_PROCEDURE (procedure);
}