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gimp/libgimp/gimpplugin.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-2003 Peter Mattis and Spencer Kimball
*
* gimpplugin.c
* Copyright (C) 2019 Michael Natterer <mitch@gimp.org>
*
* This library 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.
*
* This library 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 this library. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <errno.h>
#include <libintl.h>
#include <string.h>
#include "gimp.h"
#include "libgimpbase/gimpprotocol.h"
#include "libgimpbase/gimpwire.h"
#include "gimp-private.h"
#include "gimp-shm.h"
#include "gimpgpparams.h"
#include "gimpplugin-private.h"
#include "gimpplugin_pdb.h"
#include "gimpprocedure-private.h"
/**
* GimpPlugIn:
*
* The base class for plug-ins to derive from.
*
* GimpPlugIn manages the plug-in's [class@Procedure] objects. The procedures a
* plug-in implements are registered with GIMP by returning a list of their
* names from either [vfunc@GimpPlugIn.query_procedures] or
* [vfunc@GimpPlugIn.init_procedures].
*
* Every GIMP plug-in has to be implemented as a subclass and make it known to
* the libgimp infrastructure and the main GIMP application by passing its
* `GType` to [func@MAIN].
*
* [func@MAIN] passes the 'argc' and 'argv' of the platform's main() function,
* along with the `GType`, to [func@main], which creates an instance of the
* plug-in's `GimpPlugIn` subclass and calls its virtual functions, depending
* on how the plug-in was called by GIMP.
*
* There are 3 different ways GIMP calls a plug-in: "query", "init" and "run".
*
* The plug-in is called in "query" mode once after it was installed, or when
* the cached plug-in information in the config file "pluginrc" needs to be
* recreated. In "query" mode, [vfunc@GimpPlugIn.query_procedures] is called
* and returns a list of procedure names the plug-in implements. This is the
* "normal" place to register procedures, because the existence of most
* procedures doesn't depend on things that change between GIMP sessions.
*
* The plug-in is called in "init" mode at each GIMP startup, and
* [vfunc@PlugIn.init_procedures] is called and returns a list of procedure
* names this plug-in implements. This only happens if the plug-in actually
* implements [vfunc@GimpPlugIn.init_procedures]. A plug-in only needs to
* implement init_procedures if the existence of its procedures can change
* between GIMP sessions, for example if they depend on the presence of
* external tools, or hardware like scanners, or online services, or whatever
* variable circumstances.
*
* In order to register the plug-in's procedures with the main GIMP application
* in the plug-in's "query" and "init" modes, [class@PlugIn] calls
* [vfunc@PlugIn.create_procedure] on all procedure names in the exact order of
* the list returned by [vfunc@PlugIn.query_procedures] or
* [vfunc@PlugIn.init_procedures] and then registers the returned
* [class@Procedure].
*
* The plug-in is called in "run" mode whenever one of the procedures it
* implements is called by either the main GIMP application or any other
* plug-in. In "run" mode, one of the procedure names returned by
* [vfunc@PlugIn.query_procedures] or [vfunc@PlugIn.init_procedures] is passed
* to [vfunc@PlugIn.create_procedure] which must return a [class@Procedure] for
* the passed name. The procedure is then executed by calling
* [method@Procedure.run].
*
* In any of the three modes, [vfunc@PlugIn.quit] is called before the plug-in
* process exits, so the plug-in can perform whatever cleanup necessary.
*
* Since: 3.0
*/
#define WRITE_BUFFER_SIZE 1024
/**
* gimp_plug_in_error_quark:
*
* Generic #GQuark error domain for plug-ins. Plug-ins are welcome to
* create their own domain when they want to handle advanced error
* handling. Often, you just want to pass an error message to the core.
* This domain can be used for such simple usage.
*
* See #GError for information on error domains.
*/
G_DEFINE_QUARK (gimp-plug-in-error-quark, gimp_plug_in_error)
enum
{
PROP_0,
PROP_PROGRAM_NAME,
PROP_READ_CHANNEL,
PROP_WRITE_CHANNEL,
N_PROPS
};
typedef struct _GimpPlugInMenuBranch GimpPlugInMenuBranch;
struct _GimpPlugInMenuBranch
{
gchar *menu_path;
gchar *menu_label;
};
typedef struct _GimpPlugInPrivate
{
gchar *program_name;
GIOChannel *read_channel;
GIOChannel *write_channel;
gchar write_buffer[WRITE_BUFFER_SIZE];
gulong write_buffer_index;
guint extension_source_id;
gchar *translation_domain_name;
GFile *translation_domain_path;
gchar *help_domain_name;
GFile *help_domain_uri;
GList *menu_branches;
GList *temp_procedures;
GList *procedure_stack;
GHashTable *displays;
GHashTable *images;
GHashTable *items;
GHashTable *resources;
} GimpPlugInPrivate;
static void gimp_plug_in_constructed (GObject *object);
static void gimp_plug_in_dispose (GObject *object);
static void gimp_plug_in_finalize (GObject *object);
static void gimp_plug_in_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_plug_in_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static gboolean gimp_plug_in_real_set_i18n (GimpPlugIn *plug_in,
const gchar *procedure_name,
gchar **gettext_domain,
gchar **catalog_dir);
static void gimp_plug_in_register (GimpPlugIn *plug_in,
GList *procedures);
static gboolean gimp_plug_in_write (GIOChannel *channel,
const guint8 *buf,
gulong count,
gpointer user_data);
static gboolean gimp_plug_in_flush (GIOChannel *channel,
gpointer user_data);
static gboolean gimp_plug_in_io_error_handler (GIOChannel *channel,
GIOCondition cond,
gpointer data);
static void gimp_plug_in_loop (GimpPlugIn *plug_in);
static void gimp_plug_in_single_message (GimpPlugIn *plug_in);
static void gimp_plug_in_process_message (GimpPlugIn *plug_in,
GimpWireMessage *msg);
static void gimp_plug_in_main_proc_run (GimpPlugIn *plug_in,
GPProcRun *proc_run);
static void gimp_plug_in_temp_proc_run (GimpPlugIn *plug_in,
GPProcRun *proc_run);
static void gimp_plug_in_proc_run (GPProcRun *proc_run,
GimpProcedure *procedure,
GPProcReturn *proc_return);
static void gimp_plug_in_proc_run_internal (GimpPlugIn *plug_in,
GPProcRun *proc_run,
GimpProcedure *procedure,
GPProcReturn *proc_return);
static gboolean gimp_plug_in_extension_read (GIOChannel *channel,
GIOCondition condition,
gpointer data);
static void gimp_plug_in_push_procedure (GimpPlugIn *plug_in,
GimpProcedure *procedure);
static void gimp_plug_in_pop_procedure (GimpPlugIn *plug_in,
GimpProcedure *procedure);
static gboolean gimp_plug_in_is_procedure_stack_empty (
GimpPlugIn *plug_in);
static void gimp_plug_in_main_run_cleanup (GimpPlugIn *plug_in);
static void gimp_plug_in_temp_run_cleanup (GimpPlugIn *plug_in);
static void gimp_plug_in_destroy_hashes (GimpPlugIn *plug_in);
static void gimp_plug_in_destroy_all_proxies
(GimpPlugIn *plug_in);
static void gimp_plug_in_destroy_proxies (GimpPlugIn *plug_in,
GHashTable *hash_table,
const gchar *type,
gboolean destroy_all);
static void gimp_plug_in_init_i18n (GimpPlugIn *plug_in);
G_DEFINE_TYPE_WITH_PRIVATE (GimpPlugIn, gimp_plug_in, G_TYPE_OBJECT)
#define parent_class gimp_plug_in_parent_class
static GParamSpec *props[N_PROPS] = { NULL, };
static void
gimp_plug_in_class_init (GimpPlugInClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->constructed = gimp_plug_in_constructed;
object_class->dispose = gimp_plug_in_dispose;
object_class->finalize = gimp_plug_in_finalize;
object_class->set_property = gimp_plug_in_set_property;
object_class->get_property = gimp_plug_in_get_property;
klass->set_i18n = gimp_plug_in_real_set_i18n;
/**
* GimpPlugIn:program-name:
*
* The program name as usually found on argv[0]
*/
props[PROP_PROGRAM_NAME] =
g_param_spec_string ("program-name",
"The plug-in executable",
"The executable name as usually found on argv[0]",
NULL,
GIMP_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY);
/**
* GimpPlugIn:read-channel:
*
* The [struct@GLib.IOChannel] to read from GIMP
*/
props[PROP_READ_CHANNEL] =
g_param_spec_boxed ("read-channel",
"Read channel",
"The GIOChanel to read from GIMP",
G_TYPE_IO_CHANNEL,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY);
/**
* GimpPlugIn:write-channel:
*
* The [struct@GLib.IOChannel] to write to GIMP
*/
props[PROP_WRITE_CHANNEL] =
g_param_spec_boxed ("write-channel",
"Write channel",
"The GIOChanel to write to GIMP",
G_TYPE_IO_CHANNEL,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY);
g_object_class_install_properties (object_class, N_PROPS, props);
}
static void
gimp_plug_in_init (GimpPlugIn *plug_in)
{
}
static void
gimp_plug_in_constructed (GObject *object)
{
GimpPlugIn *plug_in = GIMP_PLUG_IN (object);
GimpPlugInPrivate *priv;
G_OBJECT_CLASS (parent_class)->constructed (object);
priv = gimp_plug_in_get_instance_private (plug_in);
g_assert (priv->read_channel != NULL);
g_assert (priv->write_channel != NULL);
gp_init ();
gimp_wire_set_writer (gimp_plug_in_write);
gimp_wire_set_flusher (gimp_plug_in_flush);
}
static void
gimp_plug_in_dispose (GObject *object)
{
GimpPlugIn *plug_in = GIMP_PLUG_IN (object);
GimpPlugInPrivate *priv;
priv = gimp_plug_in_get_instance_private (plug_in);
if (priv->extension_source_id)
{
g_source_remove (priv->extension_source_id);
priv->extension_source_id = 0;
}
if (priv->temp_procedures)
{
g_list_free_full (priv->temp_procedures, g_object_unref);
priv->temp_procedures = NULL;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gimp_plug_in_finalize (GObject *object)
{
GimpPlugIn *plug_in = GIMP_PLUG_IN (object);
GimpPlugInPrivate *priv;
GList *list;
priv = gimp_plug_in_get_instance_private (plug_in);
g_clear_pointer (&priv->program_name, g_free);
g_clear_pointer (&priv->translation_domain_name, g_free);
g_clear_object (&priv->translation_domain_path);
g_clear_pointer (&priv->help_domain_name, g_free);
g_clear_object (&priv->help_domain_uri);
for (list = priv->menu_branches; list; list = g_list_next (list))
{
GimpPlugInMenuBranch *branch = list->data;
g_free (branch->menu_path);
g_free (branch->menu_label);
g_slice_free (GimpPlugInMenuBranch, branch);
}
g_clear_pointer (&priv->menu_branches, g_list_free);
gimp_plug_in_destroy_proxies (plug_in, priv->displays, "display", TRUE);
gimp_plug_in_destroy_proxies (plug_in, priv->images, "image", TRUE);
gimp_plug_in_destroy_proxies (plug_in, priv->items, "item", TRUE);
gimp_plug_in_destroy_proxies (plug_in, priv->resources, "resource", TRUE);
gimp_plug_in_destroy_hashes (plug_in);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_plug_in_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpPlugIn *plug_in = GIMP_PLUG_IN (object);
GimpPlugInPrivate *priv;
priv = gimp_plug_in_get_instance_private (plug_in);
switch (property_id)
{
case PROP_PROGRAM_NAME:
priv->program_name = g_value_dup_string (value);
break;
case PROP_READ_CHANNEL:
priv->read_channel = g_value_get_boxed (value);
break;
case PROP_WRITE_CHANNEL:
priv->write_channel = g_value_get_boxed (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_plug_in_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpPlugIn *plug_in = GIMP_PLUG_IN (object);
GimpPlugInPrivate *priv;
priv = gimp_plug_in_get_instance_private (plug_in);
switch (property_id)
{
case PROP_READ_CHANNEL:
g_value_set_boxed (value, priv->read_channel);
break;
case PROP_WRITE_CHANNEL:
g_value_set_boxed (value, priv->write_channel);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gboolean
gimp_plug_in_real_set_i18n (GimpPlugIn *plug_in,
const gchar *procedure_name,
gchar **gettext_domain,
gchar **catalog_dir)
{
/* Default to enabling localization by gettext. It will have the good
* side-effect of warning plug-in developers of the existence of the
* ability through stderr if the catalog directory is missing.
*/
return TRUE;
}
/* public functions */
/**
* gimp_plug_in_set_help_domain:
* @plug_in: A #GimpPlugIn.
* @domain_name: The XML namespace of the plug-in's help pages.
* @domain_uri: The root URI of the plug-in's help pages.
*
* Set a help domain and path for the @plug_in.
*
* This function registers user documentation for the calling plug-in
* with the GIMP help system. The @domain_uri parameter points to the
* root directory where the plug-in help is installed. For each
* supported language there should be a file called 'gimp-help.xml'
* that maps the help IDs to the actual help files.
*
* This function can only be called in the
* [vfunc@PlugIn.query_procedures] function of a plug-in.
*
* Since: 3.0
**/
void
gimp_plug_in_set_help_domain (GimpPlugIn *plug_in,
const gchar *domain_name,
GFile *domain_uri)
{
GimpPlugInPrivate *priv;
g_return_if_fail (GIMP_IS_PLUG_IN (plug_in));
g_return_if_fail (domain_name != NULL);
g_return_if_fail (G_IS_FILE (domain_uri));
priv = gimp_plug_in_get_instance_private (plug_in);
g_free (priv->help_domain_name);
priv->help_domain_name = g_strdup (domain_name);
g_set_object (&priv->help_domain_uri, domain_uri);
}
/**
* gimp_plug_in_add_menu_branch:
* @plug_in: A #GimpPlugIn
* @menu_path: The sub-menu's menu path.
* @menu_label: The menu label of the sub-menu.
*
* Add a new sub-menu to the GIMP menus.
*
* This function installs a sub-menu which does not belong to any
* procedure at the location @menu_path.
*
* For translations of @menu_label to work properly, @menu_label
* should only be marked for translation but passed to this function
* untranslated, for example using N_("Submenu"). GIMP will look up
* the translation in the textdomain registered for the plug-in.
*
* See also: gimp_procedure_add_menu_path().
*
* Since: 3.0
**/
void
gimp_plug_in_add_menu_branch (GimpPlugIn *plug_in,
const gchar *menu_path,
const gchar *menu_label)
{
GimpPlugInPrivate *priv;
GimpPlugInMenuBranch *branch;
g_return_if_fail (GIMP_IS_PLUG_IN (plug_in));
g_return_if_fail (menu_path != NULL);
g_return_if_fail (menu_label != NULL);
priv = gimp_plug_in_get_instance_private (plug_in);
branch = g_slice_new (GimpPlugInMenuBranch);
branch->menu_path = g_strdup (menu_path);
branch->menu_label = g_strdup (menu_label);
priv->menu_branches = g_list_append (priv->menu_branches, branch);
}
/**
* gimp_plug_in_add_temp_procedure:
* @plug_in: A #GimpPlugIn
* @procedure: A #GimpProcedure of type %GIMP_PDB_PROC_TYPE_TEMPORARY.
*
* This function adds a temporary procedure to @plug_in. It is usually
* called from a %GIMP_PDB_PROC_TYPE_EXTENSION procedure's
* [vfunc@Procedure.run].
*
* A temporary procedure is a procedure which is only available while
* one of your plug-in's "real" procedures is running.
*
* The procedure's type _must_ be
* %GIMP_PDB_PROC_TYPE_TEMPORARY or the function will fail.
*
* NOTE: Normally, plug-in communication is triggered by the plug-in
* and the GIMP core only responds to the plug-in's requests. You must
* explicitly enable receiving of temporary procedure run requests
* using either [method@PlugIn.extension_enable] or
* [method@PlugIn.extension_process]. See their respective documentation
* for details.
*
* Since: 3.0
**/
void
gimp_plug_in_add_temp_procedure (GimpPlugIn *plug_in,
GimpProcedure *procedure)
{
GimpPlugInPrivate *priv;
g_return_if_fail (GIMP_IS_PLUG_IN (plug_in));
g_return_if_fail (GIMP_IS_PROCEDURE (procedure));
g_return_if_fail (gimp_procedure_get_proc_type (procedure) ==
GIMP_PDB_PROC_TYPE_TEMPORARY);
priv = gimp_plug_in_get_instance_private (plug_in);
priv->temp_procedures =
g_list_prepend (priv->temp_procedures,
g_object_ref (procedure));
GIMP_PROCEDURE_GET_CLASS (procedure)->install (procedure);
}
/**
* gimp_plug_in_remove_temp_procedure:
* @plug_in: A #GimpPlugIn
* @procedure_name: The name of a [class@Procedure] added to @plug_in.
*
* This function removes a temporary procedure from @plug_in by the
* procedure's @procedure_name.
*
* Since: 3.0
**/
void
gimp_plug_in_remove_temp_procedure (GimpPlugIn *plug_in,
const gchar *procedure_name)
{
GimpProcedure *procedure;
g_return_if_fail (GIMP_IS_PLUG_IN (plug_in));
g_return_if_fail (gimp_is_canonical_identifier (procedure_name));
procedure = gimp_plug_in_get_temp_procedure (plug_in, procedure_name);
if (procedure)
{
GimpPlugInPrivate *priv;
GIMP_PROCEDURE_GET_CLASS (procedure)->uninstall (procedure);
priv = gimp_plug_in_get_instance_private (plug_in);
priv->temp_procedures =
g_list_remove (priv->temp_procedures,
procedure);
g_object_unref (procedure);
}
}
/**
* gimp_plug_in_get_temp_procedures:
* @plug_in: A plug-in
*
* This function retrieves the list of temporary procedure of @plug_in as
* added with [method@PlugIn.add_temp_procedure].
*
* Returns: (transfer none) (element-type GimpProcedure): The list of
* procedures.
*
* Since: 3.0
**/
GList *
gimp_plug_in_get_temp_procedures (GimpPlugIn *plug_in)
{
GimpPlugInPrivate *priv;
g_return_val_if_fail (GIMP_IS_PLUG_IN (plug_in), NULL);
priv = gimp_plug_in_get_instance_private (plug_in);
return priv->temp_procedures;
}
/**
* gimp_plug_in_get_temp_procedure:
* @plug_in: A #GimpPlugIn
* @procedure_name: The name of a [class@Procedure] added to @plug_in.
*
* This function retrieves a temporary procedure from @plug_in by the
* procedure's @procedure_name.
*
* Returns: (nullable) (transfer none): The procedure if registered, or %NULL.
*
* Since: 3.0
**/
GimpProcedure *
gimp_plug_in_get_temp_procedure (GimpPlugIn *plug_in,
const gchar *procedure_name)
{
GimpPlugInPrivate *priv;
GList *list;
g_return_val_if_fail (GIMP_IS_PLUG_IN (plug_in), NULL);
g_return_val_if_fail (gimp_is_canonical_identifier (procedure_name), NULL);
priv = gimp_plug_in_get_instance_private (plug_in);
for (list = priv->temp_procedures; list; list = g_list_next (list))
{
GimpProcedure *procedure = list->data;
if (! strcmp (procedure_name, gimp_procedure_get_name (procedure)))
return procedure;
}
return NULL;
}
/**
* gimp_plug_in_extension_enable:
* @plug_in: A plug-in
*
* Enables asynchronous processing of messages from the main GIMP
* application.
*
* Normally, a plug-in is not called by GIMP except for the call to
* the procedure it implements. All subsequent communication is
* triggered by the plug-in and all messages sent from GIMP to the
* plug-in are just answers to requests the plug-in made.
*
* If the plug-in however registered temporary procedures using
* [method@PlugIn.add_temp_procedure], it needs to be able to receive
* requests to execute them. Usually this will be done by running
* [method@PlugIn.extension_process] in an endless loop.
*
* If the plug-in cannot use [method@PlugIn.extension_process], i.e. if
* it has a GUI and is hanging around in a [struct@GLib.MainLoop], it
* must call [method@PlugIn.extension_enable].
*
* Note that the plug-in does not need to be a
* [enum@Gimp.PDBProcType.EXTENSION] to register temporary procedures.
*
* See also: [method@PlugIn.add_temp_procedure].
*
* Since: 3.0
**/
void
gimp_plug_in_extension_enable (GimpPlugIn *plug_in)
{
GimpPlugInPrivate *priv;
g_return_if_fail (GIMP_IS_PLUG_IN (plug_in));
priv = gimp_plug_in_get_instance_private (plug_in);
if (! priv->extension_source_id)
{
priv->extension_source_id =
g_io_add_watch (priv->read_channel, G_IO_IN | G_IO_PRI,
gimp_plug_in_extension_read,
plug_in);
}
}
/**
* gimp_plug_in_extension_process:
* @plug_in: A plug-in.
* @timeout: The timeout (in ms) to use for the select() call.
*
* Processes one message sent by GIMP and returns.
*
* Call this function in an endless loop after calling
* gimp_procedure_extension_ready() to process requests for running
* temporary procedures.
*
* See [method@PlugIn.extension_enable] for an asynchronous way of
* doing the same if running an endless loop is not an option.
*
* See also: [method@PlugIn.add_temp_procedure].
*
* Since: 3.0
**/
void
gimp_plug_in_extension_process (GimpPlugIn *plug_in,
guint timeout)
{
GimpPlugInPrivate *priv;
#ifndef G_OS_WIN32
gint select_val;
#else
/* Zero means infinite wait for us, but g_poll and
* g_io_channel_win32_poll use -1 to indicate
* infinite wait.
*/
GPollFD pollfd;
#endif
g_return_if_fail (GIMP_IS_PLUG_IN (plug_in));
priv = gimp_plug_in_get_instance_private (plug_in);
#ifndef G_OS_WIN32
do
{
fd_set readfds;
struct timeval tv;
struct timeval *tvp;
if (timeout)
{
tv.tv_sec = timeout / 1000;
tv.tv_usec = (timeout % 1000) * 1000;
tvp = &tv;
}
else
tvp = NULL;
FD_ZERO (&readfds);
FD_SET (g_io_channel_unix_get_fd (priv->read_channel),
&readfds);
if ((select_val = select (FD_SETSIZE, &readfds, NULL, NULL, tvp)) > 0)
{
gimp_plug_in_single_message (plug_in);
}
else if (select_val == -1 && errno != EINTR)
{
perror ("gimp_plug_in_extension_process");
gimp_quit ();
}
}
while (select_val == -1 && errno == EINTR);
#else
if (timeout == 0)
timeout = -1;
g_io_channel_win32_make_pollfd (priv->read_channel, G_IO_IN,
&pollfd);
if (g_io_channel_win32_poll (&pollfd, 1, timeout) == 1)
{
gimp_plug_in_single_message (plug_in);
}
#endif
}
/**
* gimp_plug_in_set_pdb_error_handler:
* @plug_in: A plug-in
* @handler: Who is responsible for handling procedure call errors.
*
* Sets an error handler for procedure calls.
*
* This procedure changes the way that errors in procedure calls are
* handled. By default GIMP will raise an error dialog if a procedure
* call made by a plug-in fails. Using this procedure the plug-in can
* change this behavior. If the error handler is set to
* %GIMP_PDB_ERROR_HANDLER_PLUGIN, then the plug-in is responsible for
* calling gimp_pdb_get_last_error() and handling the error whenever
* one if its procedure calls fails. It can do this by displaying the
* error message or by forwarding it in its own return values.
*
* Since: 3.0
**/
void
gimp_plug_in_set_pdb_error_handler (GimpPlugIn *plug_in,
GimpPDBErrorHandler handler)
{
g_return_if_fail (GIMP_IS_PLUG_IN (plug_in));
_gimp_plug_in_set_pdb_error_handler (handler);
}
/**
* gimp_plug_in_get_pdb_error_handler:
* @plug_in: A plug-in
*
* Retrieves the active error handler for procedure calls.
*
* This procedure retrieves the currently active error handler for
* procedure calls made by the calling plug-in. See
* gimp_plugin_set_pdb_error_handler() for details.
*
* Returns: Who is responsible for handling procedure call errors.
*
* Since: 3.0
**/
GimpPDBErrorHandler
gimp_plug_in_get_pdb_error_handler (GimpPlugIn *plug_in)
{
g_return_val_if_fail (GIMP_IS_PLUG_IN (plug_in),
GIMP_PDB_ERROR_HANDLER_INTERNAL);
return _gimp_plug_in_get_pdb_error_handler ();
}
/* internal functions */
void
_gimp_plug_in_query (GimpPlugIn *plug_in)
{
GimpPlugInPrivate *priv;
g_return_if_fail (GIMP_IS_PLUG_IN (plug_in));
priv = gimp_plug_in_get_instance_private (plug_in);
if (GIMP_PLUG_IN_GET_CLASS (plug_in)->init_procedures)
gp_has_init_write (priv->write_channel, plug_in);
if (GIMP_PLUG_IN_GET_CLASS (plug_in)->query_procedures)
{
GList *procedures =
GIMP_PLUG_IN_GET_CLASS (plug_in)->query_procedures (plug_in);
gimp_plug_in_register (plug_in, procedures);
}
}
void
_gimp_plug_in_init (GimpPlugIn *plug_in)
{
g_return_if_fail (GIMP_IS_PLUG_IN (plug_in));
if (GIMP_PLUG_IN_GET_CLASS (plug_in)->init_procedures)
{
GList *procedures =
GIMP_PLUG_IN_GET_CLASS (plug_in)->init_procedures (plug_in);
gimp_plug_in_register (plug_in, procedures);
}
}
void
_gimp_plug_in_run (GimpPlugIn *plug_in)
{
GimpPlugInPrivate *priv;
g_return_if_fail (GIMP_IS_PLUG_IN (plug_in));
priv = gimp_plug_in_get_instance_private (plug_in);
g_io_add_watch (priv->read_channel,
G_IO_ERR | G_IO_HUP,
gimp_plug_in_io_error_handler,
NULL);
gimp_plug_in_loop (plug_in);
}
void
_gimp_plug_in_quit (GimpPlugIn *plug_in)
{
GimpPlugInPrivate *priv;
g_return_if_fail (GIMP_IS_PLUG_IN (plug_in));
priv = gimp_plug_in_get_instance_private (plug_in);
if (GIMP_PLUG_IN_GET_CLASS (plug_in)->quit)
GIMP_PLUG_IN_GET_CLASS (plug_in)->quit (plug_in);
_gimp_shm_close ();
gp_quit_write (priv->write_channel, plug_in);
}
GIOChannel *
_gimp_plug_in_get_read_channel (GimpPlugIn *plug_in)
{
GimpPlugInPrivate *priv;
g_return_val_if_fail (GIMP_IS_PLUG_IN (plug_in), NULL);
priv = gimp_plug_in_get_instance_private (plug_in);
return priv->read_channel;
}
GIOChannel *
_gimp_plug_in_get_write_channel (GimpPlugIn *plug_in)
{
GimpPlugInPrivate *priv;
g_return_val_if_fail (GIMP_IS_PLUG_IN (plug_in), NULL);
priv = gimp_plug_in_get_instance_private (plug_in);
return priv->write_channel;
}
void
_gimp_plug_in_read_expect_msg (GimpPlugIn *plug_in,
GimpWireMessage *msg,
gint type)
{
GimpPlugInPrivate *priv;
g_return_if_fail (GIMP_IS_PLUG_IN (plug_in));
priv = gimp_plug_in_get_instance_private (plug_in);
while (TRUE)
{
if (! gimp_wire_read_msg (priv->read_channel, msg, NULL))
gimp_quit ();
if (msg->type == type)
return; /* up to the caller to call wire_destroy() */
if (msg->type == GP_TEMP_PROC_RUN || msg->type == GP_QUIT)
{
gimp_plug_in_process_message (plug_in, msg);
}
else
{
g_error ("unexpected message: %d", msg->type);
}
gimp_wire_destroy (msg);
}
}
gboolean
_gimp_plug_in_set_i18n (GimpPlugIn *plug_in,
const gchar *procedure_name,
gchar **gettext_domain,
gchar **catalog_dir)
{
GimpPlugInPrivate *priv;
gboolean use_gettext;
g_return_val_if_fail (GIMP_IS_PLUG_IN (plug_in), FALSE);
g_return_val_if_fail (gettext_domain && *gettext_domain == NULL, FALSE);
g_return_val_if_fail (catalog_dir && *catalog_dir == NULL, FALSE);
priv = gimp_plug_in_get_instance_private (plug_in);
if (! priv->translation_domain_path ||
! priv->translation_domain_name)
gimp_plug_in_init_i18n (plug_in);
if (! GIMP_PLUG_IN_GET_CLASS (plug_in)->set_i18n)
{
use_gettext = FALSE;
}
else
{
gchar *utf8_catalog_dir = NULL;
use_gettext = GIMP_PLUG_IN_GET_CLASS (plug_in)->set_i18n (plug_in,
procedure_name,
gettext_domain,
&utf8_catalog_dir);
if (use_gettext)
{
gboolean reserved = FALSE;
if (*gettext_domain == NULL)
{
*gettext_domain = g_strdup (priv->translation_domain_name);
}
else if (g_strcmp0 (*gettext_domain, GETTEXT_PACKAGE "-std-plug-ins") == 0 ||
g_strcmp0 (*gettext_domain, GETTEXT_PACKAGE "-script-fu") == 0 ||
g_strcmp0 (*gettext_domain, GETTEXT_PACKAGE "-python") == 0)
{
/* We special-case these 3 domains as the only ones where
* it is allowed to set an absolute system dir (actually
* set by the lib itself; devs must set NULL). See docs of
* set_i18n() method.
*/
if (utf8_catalog_dir != NULL)
g_printerr ("[%s] Do not set a catalog directory with set_i18n() with reserved domain: %s\n",
procedure_name, *gettext_domain);
*catalog_dir = g_strdup (gimp_locale_directory ());
reserved = TRUE;
}
if (utf8_catalog_dir != NULL && *catalog_dir == NULL)
{
GError *error = NULL;
/* The passed-on catalog directory is in UTF-8 because this is
* usually hardcoded (in which case it's easier to request a
* specific encoding, chosen at development time, rather than the
* "OS encoding", depending on runtime).
* But now we want to transform it to the encoding used for
* filenames by GLib.
*/
*catalog_dir = g_filename_from_utf8 (utf8_catalog_dir, -1, NULL, NULL, &error);
if (*catalog_dir == NULL)
g_printerr ("[%s] provided catalog directory is not proper UTF-8: %s\n",
procedure_name, error ? error->message : "(N/A)");
g_clear_error (&error);
}
if (*catalog_dir && ! reserved)
{
if (g_path_is_absolute (*catalog_dir))
{
g_printerr ("[%s] The catalog directory set by set_i18n() is not relative: %s\n",
procedure_name, *catalog_dir);
g_printerr ("[%s] Localization disabled\n", procedure_name);
use_gettext = FALSE;
}
else
{
gchar *rootdir = g_path_get_dirname (gimp_get_progname ());
GFile *root_file = g_file_new_for_path (rootdir);
GFile *catalog_file;
GFile *parent;
catalog_file = g_file_resolve_relative_path (root_file, *catalog_dir);
/* Verify that the catalog is a subdir of the plug-in folder.
* We do not want to allow plug-ins to look outside their own
* realm.
*/
parent = g_file_dup (catalog_file);
do
{
if (g_file_equal (parent, root_file))
break;
g_clear_object (&parent);
}
while ((parent = g_file_get_parent (parent)));
if (parent == NULL)
{
g_printerr ("[%s] The catalog directory set by set_i18n() is not a subdirectory: %s\n",
procedure_name, *catalog_dir);
g_printerr ("[%s] Localization disabled\n", procedure_name);
use_gettext = FALSE;
}
g_free (rootdir);
g_object_unref (root_file);
g_clear_object (&parent);
g_object_unref (catalog_file);
}
}
else if (! *catalog_dir)
{
*catalog_dir = g_file_get_path (priv->translation_domain_path);
}
}
g_clear_pointer (&utf8_catalog_dir, g_free);
}
if (use_gettext && ! g_file_test (*catalog_dir, G_FILE_TEST_IS_DIR))
{
g_printerr ("[%s] The catalog directory does not exist: %s\n",
procedure_name, *catalog_dir);
g_printerr ("[%s] Override method set_i18n() for the plug-in to customize or disable localization.\n",
procedure_name);
g_printerr ("[%s] Localization disabled\n", procedure_name);
use_gettext = FALSE;
}
if (! use_gettext)
{
g_clear_pointer (gettext_domain, g_free);
g_clear_pointer (catalog_dir, g_free);
}
return use_gettext;
}
GimpProcedure *
_gimp_plug_in_create_procedure (GimpPlugIn *plug_in,
const gchar *procedure_name)
{
gchar *gettext_domain = NULL;
gchar *catalog_dir = NULL;
g_return_val_if_fail (GIMP_IS_PLUG_IN (plug_in), NULL);
g_return_val_if_fail (gimp_is_canonical_identifier (procedure_name), NULL);
if (_gimp_plug_in_set_i18n (plug_in, procedure_name, &gettext_domain, &catalog_dir))
{
gimp_bind_text_domain (gettext_domain, catalog_dir);
#ifdef HAVE_BIND_TEXTDOMAIN_CODESET
bind_textdomain_codeset (gettext_domain, "UTF-8");
#endif
textdomain (gettext_domain);
g_free (gettext_domain);
g_free (catalog_dir);
}
if (GIMP_PLUG_IN_GET_CLASS (plug_in)->create_procedure)
return GIMP_PLUG_IN_GET_CLASS (plug_in)->create_procedure (plug_in,
procedure_name);
return NULL;
}
/* private functions */
static void
gimp_plug_in_register (GimpPlugIn *plug_in,
GList *procedures)
{
GimpPlugInPrivate *priv;
GList *list;
for (list = procedures; list; list = g_list_next (list))
{
const gchar *name = list->data;
GimpProcedure *procedure;
procedure = _gimp_plug_in_create_procedure (plug_in, name);
if (procedure)
{
GIMP_PROCEDURE_GET_CLASS (procedure)->install (procedure);
g_object_unref (procedure);
}
else
{
g_warning ("Plug-in failed to create procedure '%s'\n", name);
}
}
g_list_free_full (procedures, g_free);
priv = gimp_plug_in_get_instance_private (plug_in);
if (priv->help_domain_name)
{
_gimp_plug_in_help_register (priv->help_domain_name,
priv->help_domain_uri);
}
for (list = priv->menu_branches; list; list = g_list_next (list))
{
GimpPlugInMenuBranch *branch = list->data;
_gimp_plug_in_menu_branch_register (branch->menu_path,
branch->menu_label);
}
}
static gboolean
gimp_plug_in_write (GIOChannel *channel,
const guint8 *buf,
gulong count,
gpointer user_data)
{
GimpPlugIn *plug_in = user_data;
GimpPlugInPrivate *priv;
priv = gimp_plug_in_get_instance_private (plug_in);
while (count > 0)
{
gulong bytes;
if ((priv->write_buffer_index + count) >= WRITE_BUFFER_SIZE)
{
bytes = WRITE_BUFFER_SIZE - priv->write_buffer_index;
memcpy (&priv->write_buffer[priv->write_buffer_index],
buf, bytes);
priv->write_buffer_index += bytes;
if (! gimp_wire_flush (channel, plug_in))
return FALSE;
}
else
{
bytes = count;
memcpy (&priv->write_buffer[priv->write_buffer_index],
buf, bytes);
priv->write_buffer_index += bytes;
}
buf += bytes;
count -= bytes;
}
return TRUE;
}
static gboolean
gimp_plug_in_flush (GIOChannel *channel,
gpointer user_data)
{
GimpPlugIn *plug_in = user_data;
GimpPlugInPrivate *priv;
priv = gimp_plug_in_get_instance_private (plug_in);
if (priv->write_buffer_index > 0)
{
gsize count = 0;
while (count != priv->write_buffer_index)
{
GIOStatus status;
gsize bytes;
GError *error = NULL;
do
{
bytes = 0;
status = g_io_channel_write_chars (channel,
&priv->write_buffer[count],
(priv->write_buffer_index - count),
&bytes,
&error);
}
while (status == G_IO_STATUS_AGAIN);
if (status != G_IO_STATUS_NORMAL)
{
if (error)
{
g_warning ("%s: gimp_flush(): error: %s",
g_get_prgname (), error->message);
g_error_free (error);
}
else
{
g_warning ("%s: gimp_flush(): error", g_get_prgname ());
}
return FALSE;
}
count += bytes;
}
priv->write_buffer_index = 0;
}
return TRUE;
}
static gboolean
gimp_plug_in_io_error_handler (GIOChannel *channel,
GIOCondition cond,
gpointer data)
{
g_printerr ("%s: fatal error: GIMP crashed\n", gimp_get_progname ());
gimp_quit ();
/* never reached */
return TRUE;
}
static void
gimp_plug_in_loop (GimpPlugIn *plug_in)
{
GimpPlugInPrivate *priv;
priv = gimp_plug_in_get_instance_private (plug_in);
while (TRUE)
{
GimpWireMessage msg;
if (! gimp_wire_read_msg (priv->read_channel, &msg, NULL))
return;
switch (msg.type)
{
case GP_QUIT:
gimp_wire_destroy (&msg);
return;
case GP_CONFIG:
_gimp_config (msg.data);
break;
case GP_TILE_REQ:
case GP_TILE_ACK:
case GP_TILE_DATA:
g_warning ("unexpected tile message received (should not happen)");
break;
case GP_PROC_RUN:
gimp_plug_in_main_proc_run (plug_in, msg.data);
gimp_wire_destroy (&msg);
return;
case GP_PROC_RETURN:
g_warning ("unexpected proc return message received (should not happen)");
break;
case GP_TEMP_PROC_RUN:
g_warning ("unexpected temp proc run message received (should not happen");
break;
case GP_TEMP_PROC_RETURN:
g_warning ("unexpected temp proc return message received (should not happen");
break;
case GP_PROC_INSTALL:
g_warning ("unexpected proc install message received (should not happen)");
break;
case GP_HAS_INIT:
g_warning ("unexpected has init message received (should not happen)");
break;
}
gimp_wire_destroy (&msg);
}
}
static void
gimp_plug_in_single_message (GimpPlugIn *plug_in)
{
GimpPlugInPrivate *priv;
GimpWireMessage msg;
priv = gimp_plug_in_get_instance_private (plug_in);
/* Run a temp function */
if (! gimp_wire_read_msg (priv->read_channel, &msg, NULL))
gimp_quit ();
gimp_plug_in_process_message (plug_in, &msg);
gimp_wire_destroy (&msg);
}
static void
gimp_plug_in_process_message (GimpPlugIn *plug_in,
GimpWireMessage *msg)
{
switch (msg->type)
{
case GP_QUIT:
gimp_quit ();
break;
case GP_CONFIG:
_gimp_config (msg->data);
break;
case GP_TILE_REQ:
case GP_TILE_ACK:
case GP_TILE_DATA:
g_warning ("unexpected tile message received (should not happen)");
break;
case GP_PROC_RUN:
g_warning ("unexpected proc run message received (should not happen)");
break;
case GP_PROC_RETURN:
g_warning ("unexpected proc return message received (should not happen)");
break;
case GP_TEMP_PROC_RUN:
gimp_plug_in_temp_proc_run (plug_in, msg->data);
break;
case GP_TEMP_PROC_RETURN:
g_warning ("unexpected temp proc return message received (should not happen)");
break;
case GP_PROC_INSTALL:
g_warning ("unexpected proc install message received (should not happen)");
break;
case GP_HAS_INIT:
g_warning ("unexpected has init message received (should not happen)");
break;
}
}
/* Run a proc that is main, i.e. root of a plugin call stack. */
static void
gimp_plug_in_main_proc_run (GimpPlugIn *plug_in,
GPProcRun *proc_run)
{
GimpPlugInPrivate *priv;
GPProcReturn proc_return;
GimpProcedure *procedure;
procedure = _gimp_plug_in_create_procedure (plug_in, proc_run->name);
priv = gimp_plug_in_get_instance_private (plug_in);
if (procedure)
{
gimp_plug_in_proc_run_internal (plug_in,
proc_run, procedure,
&proc_return);
g_object_unref (procedure);
}
gimp_plug_in_main_run_cleanup (plug_in);
if (! gp_proc_return_write (priv->write_channel,
&proc_return, plug_in))
gimp_quit ();
_gimp_gp_params_free (proc_return.params, proc_return.n_params, TRUE);
}
static void
gimp_plug_in_temp_proc_run (GimpPlugIn *plug_in,
GPProcRun *proc_run)
{
GimpPlugInPrivate *priv;
GPProcReturn proc_return;
GimpProcedure *procedure;
procedure = gimp_plug_in_get_temp_procedure (plug_in, proc_run->name);
priv = gimp_plug_in_get_instance_private (plug_in);
if (procedure)
{
gimp_plug_in_proc_run_internal (plug_in,
proc_run, procedure,
&proc_return);
}
gimp_plug_in_temp_run_cleanup (plug_in);
if (! gp_temp_proc_return_write (priv->write_channel,
&proc_return, plug_in))
gimp_quit ();
_gimp_gp_params_free (proc_return.params, proc_return.n_params, TRUE);
}
/* Run the proc, passing args from proc_run
* and returning values in proc_return.
* This does not alter the state of the GimpPlugin.
*/
static void
gimp_plug_in_proc_run (GPProcRun *proc_run,
GimpProcedure *procedure,
GPProcReturn *proc_return)
{
GimpValueArray *arguments;
GimpValueArray *return_values = NULL;
arguments = _gimp_gp_params_to_value_array (NULL,
NULL, 0,
proc_run->params,
proc_run->n_params,
FALSE);
return_values = _gimp_procedure_run_array (procedure, arguments);
gimp_value_array_unref (arguments);
proc_return->name = proc_run->name;
proc_return->n_params = gimp_value_array_length (return_values);
proc_return->params = _gimp_value_array_to_gp_params (return_values, TRUE);
gimp_value_array_unref (return_values);
}
/* Setup translation, maintain proc stack, and run proc.
* Proc is a main or temp proc.
* "internal" means private, not that the proc is type INTERNAL.
*/
static void
gimp_plug_in_proc_run_internal (GimpPlugIn *plug_in,
GPProcRun *proc_run,
GimpProcedure *procedure,
GPProcReturn *proc_return)
{
gchar *gettext_domain = NULL;
gchar *catalog_dir = NULL;
if (_gimp_plug_in_set_i18n (plug_in, gimp_procedure_get_name (procedure),
&gettext_domain, &catalog_dir))
{
gimp_bind_text_domain (gettext_domain, catalog_dir);
#ifdef HAVE_BIND_TEXTDOMAIN_CODESET
bind_textdomain_codeset (gettext_domain, "UTF-8");
#endif
textdomain (gettext_domain);
g_free (gettext_domain);
g_free (catalog_dir);
}
gimp_plug_in_push_procedure (plug_in, procedure);
gimp_plug_in_proc_run (proc_run, procedure, proc_return);
gimp_plug_in_pop_procedure (plug_in, procedure);
}
static gboolean
gimp_plug_in_extension_read (GIOChannel *channel,
GIOCondition condition,
gpointer data)
{
GimpPlugIn *plug_in = data;
gimp_plug_in_single_message (plug_in);
return G_SOURCE_CONTINUE;
}
/* procedure stack / display-, image-, item-cache */
GimpProcedure *
_gimp_plug_in_get_procedure (GimpPlugIn *plug_in)
{
GimpPlugInPrivate *priv;
g_return_val_if_fail (GIMP_IS_PLUG_IN (plug_in), NULL);
priv = gimp_plug_in_get_instance_private (plug_in);
g_return_val_if_fail (priv->procedure_stack != NULL, NULL);
return priv->procedure_stack->data;
}
static gboolean
gimp_plug_in_is_procedure_stack_empty (GimpPlugIn *plug_in)
{
GimpPlugInPrivate *priv = gimp_plug_in_get_instance_private (plug_in);
return (priv->procedure_stack == NULL);
}
static void
gimp_plug_in_push_procedure (GimpPlugIn *plug_in,
GimpProcedure *procedure)
{
GimpPlugInPrivate *priv = gimp_plug_in_get_instance_private (plug_in);
priv->procedure_stack =
g_list_prepend (priv->procedure_stack, procedure);
}
/* After a run of a main proc, cleanup.
* We are about to return to GIMP or another calling plugin process.
* This plugin process will soon terminate.
*
* Expect the proc stack is empty: don't destroy proxies
* when there are still calling procs that might have a reference.
*/
static void
gimp_plug_in_main_run_cleanup (GimpPlugIn *plug_in)
{
if (gimp_plug_in_is_procedure_stack_empty (plug_in))
{
g_debug ("%s proc stack empty, destroy proxies.", G_STRFUNC);
gimp_plug_in_destroy_all_proxies (plug_in);
gimp_plug_in_destroy_hashes (plug_in);
}
else
{
/* Unexpected. */
g_warning ("%s proc stack not empty when main proc returns.", G_STRFUNC);
}
}
/* After a run of a temp proc, cleanup.
* We are about to return to another calling proc.
*
* When the just-run temp proc is returning to top proc on stack and it is an extension,
* cleanup is destroy the plugin's proxies.
* The proc stack is never empty for an extension: the top is e.g. extension-script-fu,
* which must not reference proxies.
*/
static void
gimp_plug_in_temp_run_cleanup (GimpPlugIn *plug_in)
{
GimpPlugInPrivate *priv = gimp_plug_in_get_instance_private (plug_in);
/* When at top of proc stack and top is an extension, destroy proxies. */
if ((g_list_length (priv->procedure_stack) == 1) &&
(gimp_procedure_get_proc_type (priv->procedure_stack->data) == GIMP_PDB_PROC_TYPE_EXTENSION))
{
g_debug ("%s top of proc stack is extension, destroy proxies.", G_STRFUNC);
gimp_plug_in_destroy_all_proxies (plug_in);
gimp_plug_in_destroy_hashes (plug_in);
}
else
{
/* Normal. The temp proc just run was called by a calling proc
* which is not a main proc of an extension plugin.
* We can't destroy proxies because the calling proc may retain a reference.
*/
g_debug ("%s Not destroy proxies for temp proc.", G_STRFUNC);
}
}
static void
gimp_plug_in_pop_procedure (GimpPlugIn *plug_in,
GimpProcedure *procedure)
{
GimpPlugInPrivate *priv = gimp_plug_in_get_instance_private (plug_in);
priv->procedure_stack = g_list_remove (priv->procedure_stack, procedure);
/* Make procedure object unref it's proxy references.
* Our hashes still have references to proxies.
* Calling procs may also have retained references to proxies.
*/
_gimp_procedure_destroy_proxies (procedure);
/* Don't destroy proxies now because any proc, especially temporary procs,
* may have passed a reference to a proc higher in the stack e.g. the main procedure.
* We don't have separate proxy hashes for each pushed procedure,
* only a hash table for the run.
*/
}
GimpDisplay *
_gimp_plug_in_get_display (GimpPlugIn *plug_in,
gint32 display_id)
{
GimpPlugInPrivate *priv;
GimpDisplay *display = NULL;
g_return_val_if_fail (GIMP_IS_PLUG_IN (plug_in), NULL);
priv = gimp_plug_in_get_instance_private (plug_in);
if (G_UNLIKELY (! priv->displays))
priv->displays =
g_hash_table_new_full (g_direct_hash,
g_direct_equal,
NULL,
(GDestroyNotify) g_object_unref);
display = g_hash_table_lookup (priv->displays,
GINT_TO_POINTER (display_id));
if (! display)
{
display = g_object_new (GIMP_TYPE_DISPLAY,
"id", display_id,
NULL);
g_hash_table_insert (priv->displays,
GINT_TO_POINTER (display_id),
display);
}
return display;
}
GimpImage *
_gimp_plug_in_get_image (GimpPlugIn *plug_in,
gint32 image_id)
{
GimpPlugInPrivate *priv;
GimpImage *image = NULL;
g_return_val_if_fail (GIMP_IS_PLUG_IN (plug_in), NULL);
priv = gimp_plug_in_get_instance_private (plug_in);
if (G_UNLIKELY (! priv->images))
priv->images =
g_hash_table_new_full (g_direct_hash,
g_direct_equal,
NULL,
(GDestroyNotify) g_object_unref);
image = g_hash_table_lookup (priv->images,
GINT_TO_POINTER (image_id));
if (! image)
{
image = g_object_new (GIMP_TYPE_IMAGE,
"id", image_id,
NULL);
g_hash_table_insert (priv->images,
GINT_TO_POINTER (image_id),
image);
}
return image;
}
GimpItem *
_gimp_plug_in_get_item (GimpPlugIn *plug_in,
gint32 item_id)
{
GimpPlugInPrivate *priv;
GimpItem *item = NULL;
g_return_val_if_fail (GIMP_IS_PLUG_IN (plug_in), NULL);
priv = gimp_plug_in_get_instance_private (plug_in);
if (G_UNLIKELY (! priv->items))
priv->items =
g_hash_table_new_full (g_direct_hash,
g_direct_equal,
NULL,
(GDestroyNotify) g_object_unref);
item = g_hash_table_lookup (priv->items,
GINT_TO_POINTER (item_id));
if (! item)
{
if (gimp_item_id_is_text_layer (item_id))
{
item = g_object_new (GIMP_TYPE_TEXT_LAYER,
"id", item_id,
NULL);
}
else if (gimp_item_id_is_group_layer (item_id))
{
item = g_object_new (GIMP_TYPE_GROUP_LAYER,
"id", item_id,
NULL);
}
else if (gimp_item_id_is_layer (item_id))
{
item = g_object_new (GIMP_TYPE_LAYER,
"id", item_id,
NULL);
}
else if (gimp_item_id_is_layer_mask (item_id))
{
item = g_object_new (GIMP_TYPE_LAYER_MASK,
"id", item_id,
NULL);
}
else if (gimp_item_id_is_selection (item_id))
{
item = g_object_new (GIMP_TYPE_SELECTION,
"id", item_id,
NULL);
}
else if (gimp_item_id_is_channel (item_id))
{
item = g_object_new (GIMP_TYPE_CHANNEL,
"id", item_id,
NULL);
}
else if (gimp_item_id_is_path (item_id))
{
item = g_object_new (GIMP_TYPE_PATH,
"id", item_id,
NULL);
}
if (item)
g_hash_table_insert (priv->items,
GINT_TO_POINTER (item_id),
item);
}
return item;
}
GimpResource *
_gimp_plug_in_get_resource (GimpPlugIn *plug_in,
gint32 resource_id)
{
GimpPlugInPrivate *priv;
GimpResource *resource = NULL;
g_return_val_if_fail (GIMP_IS_PLUG_IN (plug_in), NULL);
priv = gimp_plug_in_get_instance_private (plug_in);
if (G_UNLIKELY (! priv->resources))
priv->resources =
g_hash_table_new_full (g_direct_hash,
g_direct_equal,
NULL,
(GDestroyNotify) g_object_unref);
resource = g_hash_table_lookup (priv->resources,
GINT_TO_POINTER (resource_id));
if (! resource)
{
if (gimp_resource_id_is_brush (resource_id))
{
resource = g_object_new (GIMP_TYPE_BRUSH,
"id", resource_id,
NULL);
}
else if (gimp_resource_id_is_pattern (resource_id))
{
resource = g_object_new (GIMP_TYPE_PATTERN,
"id", resource_id,
NULL);
}
else if (gimp_resource_id_is_gradient (resource_id))
{
resource = g_object_new (GIMP_TYPE_GRADIENT,
"id", resource_id,
NULL);
}
else if (gimp_resource_id_is_palette (resource_id))
{
resource = g_object_new (GIMP_TYPE_PALETTE,
"id", resource_id,
NULL);
}
else if (gimp_resource_id_is_font (resource_id))
{
resource = g_object_new (GIMP_TYPE_FONT,
"id", resource_id,
NULL);
}
if (resource)
g_hash_table_insert (priv->resources,
GINT_TO_POINTER (resource_id),
resource);
}
return resource;
}
gboolean
_gimp_plug_in_manage_memory_manually (GimpPlugIn *plug_in)
{
GimpPlugInPrivate *priv;
gboolean manual_management = TRUE;
priv = gimp_plug_in_get_instance_private (plug_in);
if (priv->program_name)
{
GFile *file = g_file_new_for_path (priv->program_name);
/* Limitations:
* 1. Checking a file extension (and trusting argv[0] in general) is not
* the best idea. I thought about the possibility of passing through
* the name of the used interpreter from core to plug-in, but even this
* should not be trusted because it is configurable.
* 2. An alternative could be to pass the information if a plug-in is
* interpreted (i.e. it has an interp file). Though I'm unsure if there
* might be some interpreted language out there with manual memory
* management.
* 3. This list only contains the bindings we actually tested with (and
* have demo plug-ins for). Much more bindings are possible.
*
* So in the end, this test is just worth so far, but it's
* acceptable for the officially supported bindings at least.
*/
if (gimp_file_has_extension (file, ".lua") ||
gimp_file_has_extension (file, ".py") ||
gimp_file_has_extension (file, ".js") ||
gimp_file_has_extension (file, ".gjs"))
manual_management = FALSE;
g_object_unref (file);
}
return manual_management;
}
static void
gimp_plug_in_destroy_hashes (GimpPlugIn *plug_in)
{
GimpPlugInPrivate *priv = gimp_plug_in_get_instance_private (plug_in);
g_clear_pointer (&priv->displays, g_hash_table_unref);
g_clear_pointer (&priv->images, g_hash_table_unref);
g_clear_pointer (&priv->items, g_hash_table_unref);
g_clear_pointer (&priv->resources, g_hash_table_unref);
}
/* Destroy proxies of all kinds.
* This destroys with prejudice, i.e. destroy_all==TRUE.
* All procedures, main and temporary, of the plugin must not be run subsequently,
* especially to reference a proxy we are destroying.
*/
static void
gimp_plug_in_destroy_all_proxies (GimpPlugIn *plug_in)
{
GimpPlugInPrivate *priv = gimp_plug_in_get_instance_private (plug_in);
gimp_plug_in_destroy_proxies (plug_in, priv->displays, "display", TRUE);
gimp_plug_in_destroy_proxies (plug_in, priv->images, "image", TRUE);
gimp_plug_in_destroy_proxies (plug_in, priv->items, "item", TRUE);
gimp_plug_in_destroy_proxies (plug_in, priv->resources, "resource", TRUE);
}
static void
gimp_plug_in_destroy_proxies (GimpPlugIn *plug_in,
GHashTable *hash_table,
const gchar *type,
gboolean destroy_all)
{
GHashTableIter iter;
gpointer key, value;
if (! hash_table)
return;
g_hash_table_iter_init (&iter, hash_table);
while (g_hash_table_iter_next (&iter, &key, &value))
{
GObject *object = value;
if (object->ref_count == 1)
{
/* this is the normal case for an unused proxy, since we already
* destroyed the only other reference in procedure with
* _gimp_procedure_destroy_proxies().
*/
g_hash_table_iter_remove (&iter);
}
else if (! G_IS_OBJECT (object))
{
/* this is debug code, a plug-in MUST NOT unref a proxy. To be nice,
* we steal the object from the table, as removing it normally would
* crash, since the object is not valid anymore.
*/
g_printerr ("%s: ERROR: %s proxy was unrefed "
"by plug-in, it MUST NOT do that!\n",
G_STRFUNC, type);
g_hash_table_iter_steal (&iter);
}
else if (destroy_all)
{
/* this is debug code, a plug-in MUST NOT ref a proxy */
gint id;
g_object_get (object, "id", &id, NULL);
/* Some bindings are always keeping a reference to objects, in
* particular this is the behavior of lua and gjs bindings where
* object->ref_count == 2 at this point.
* As for the Python binding, it is only true for global
* variables (scoped variables are properly freed before the
* plug-in ends), which anyway is not the best practice.
* In any case, it's not something which the plug-in developer can do
* anything about so this error is only confusing.
* See #3912.
*/
if (_gimp_plug_in_manage_memory_manually (plug_in))
g_printerr ("%s: ERROR: %s proxy with ID %d was refed "
"by plug-in, it MUST NOT do that!\n",
G_STRFUNC, G_OBJECT_TYPE_NAME (object), id);
#if 0
/* The code used to do this, which is only meaningful when the bug is
* really in the plug-in code. If it's one of the cases where the
* reference is actually held by a bindings, it's unwise and will
* likely end up in double-free crashes.
*/
while (object->ref_count > 1)
g_object_unref (object);
#endif
g_hash_table_iter_remove (&iter);
}
}
}
static void
gimp_plug_in_init_i18n (GimpPlugIn *plug_in)
{
GimpPlugInPrivate *priv;
gchar *rootdir = g_path_get_dirname (gimp_get_progname ());
GFile *root_file = g_file_new_for_path (rootdir);
GFile *catalog_file = NULL;
g_return_if_fail (GIMP_IS_PLUG_IN (plug_in));
priv = gimp_plug_in_get_instance_private (plug_in);
/* Default domain name is the program directory name. */
g_free (priv->translation_domain_name);
priv->translation_domain_name = g_path_get_basename (rootdir);
/* Default catalog path is the locale/ directory under the root
* directory.
*/
catalog_file = g_file_resolve_relative_path (root_file, "locale");
g_set_object (&priv->translation_domain_path, catalog_file);
g_free (rootdir);
g_object_unref (root_file);
g_object_unref (catalog_file);
}
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