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gimp/app/procedural_db.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 <stdarg.h>
#include <string.h>
#include "appenv.h"
#include "app_procs.h"
#include "plug_in.h"
#include "procedural_db.h"
#include "libgimp/gimpparasite.h"
#include "libgimp/gimpintl.h"
GHashTable *procedural_ht = NULL;
/* Local functions */
static guint procedural_db_hash_func (gconstpointer key);
static void pdb_id_init (void);
void
procedural_db_init (void)
{
app_init_update_status (_("Procedural Database"), NULL, -1);
if (!procedural_ht)
procedural_ht = g_hash_table_new (procedural_db_hash_func, g_str_equal);
pdb_id_init ();
}
static void
procedural_db_free_entry (gpointer key,
gpointer value,
gpointer user_data)
{
if (value)
g_list_free (value);
}
void
procedural_db_free (void)
{
if (procedural_ht)
{
g_hash_table_foreach (procedural_ht, procedural_db_free_entry, NULL);
g_hash_table_destroy (procedural_ht);
}
procedural_ht = NULL;
}
void
procedural_db_register (ProcRecord *procedure)
{
GList *list;
if (!procedural_ht)
procedural_db_init ();
list = g_hash_table_lookup (procedural_ht, (gpointer) procedure->name);
list = g_list_prepend (list, (gpointer) procedure);
g_hash_table_insert (procedural_ht,
(gpointer) procedure->name,
(gpointer) list);
}
void
procedural_db_unregister (gchar *name)
{
GList *list;
list = g_hash_table_lookup (procedural_ht, (gpointer) name);
if (list)
{
list = g_list_remove (list, list->data);
if (list)
g_hash_table_insert (procedural_ht,
(gpointer) name,
(gpointer) list);
else
g_hash_table_remove (procedural_ht,
(gpointer) name);
}
}
ProcRecord *
procedural_db_lookup (gchar *name)
{
GList *list;
ProcRecord *procedure;
list = g_hash_table_lookup (procedural_ht, (gpointer) name);
if (list != NULL)
procedure = (ProcRecord *) list->data;
else
procedure = NULL;
return procedure;
}
Argument *
procedural_db_execute (gchar *name,
Argument *args)
{
ProcRecord *procedure;
Argument *return_args;
GList *list;
gint i;
return_args = NULL;
list = g_hash_table_lookup (procedural_ht, (gpointer) name);
if (list == NULL)
{
g_message (_("PDB calling error %s not found"), name);
return_args = g_new (Argument, 1);
return_args->arg_type = PDB_STATUS;
return_args->value.pdb_int = PDB_CALLING_ERROR;
return return_args;
}
while (list)
{
if ((procedure = (ProcRecord *) list->data) == NULL)
{
g_message (_("PDB calling error %s not found"), name);
return_args = g_new (Argument, 1);
return_args->arg_type = PDB_STATUS;
return_args->value.pdb_int = PDB_CALLING_ERROR;
return return_args;
}
list = list->next;
/* check the arguments */
for (i = 0; i < procedure->num_args; i++)
{
if (args[i].arg_type != procedure->args[i].arg_type)
{
return_args = g_new (Argument, 1);
return_args->arg_type = PDB_STATUS;
return_args->value.pdb_int = PDB_CALLING_ERROR;
g_message (_("PDB calling error %s"), procedure->name);
return return_args;
}
}
/* call the procedure */
switch (procedure->proc_type)
{
case PDB_INTERNAL:
return_args = (* procedure->exec_method.internal.marshal_func) (args);
break;
case PDB_PLUGIN:
return_args = plug_in_run (procedure, args, procedure->num_args, TRUE, FALSE, -1);
break;
case PDB_EXTENSION:
return_args = plug_in_run (procedure, args, procedure->num_args, TRUE, FALSE, -1);
break;
case PDB_TEMPORARY:
return_args = plug_in_run (procedure, args, procedure->num_args, TRUE, FALSE, -1);
break;
default:
return_args = g_new (Argument, 1);
return_args->arg_type = PDB_STATUS;
return_args->value.pdb_int = PDB_EXECUTION_ERROR;
break;
}
if ((return_args[0].value.pdb_int != PDB_SUCCESS) &&
(procedure->num_values > 0))
memset (&return_args[1], 0, sizeof (Argument) * procedure->num_values);
/* Check if the return value is a PDB_PASS_THROUGH, in which case run the
* next procedure in the list
*/
if (return_args[0].value.pdb_int != PDB_PASS_THROUGH)
break;
else if (list) /* Pass through, so destroy return values and run another procedure */
procedural_db_destroy_args (return_args, procedure->num_values);
}
return return_args;
}
Argument *
procedural_db_run_proc (gchar *name,
gint *nreturn_vals,
...)
{
ProcRecord *proc;
Argument *params;
Argument *return_vals;
va_list args;
gint i;
if ((proc = procedural_db_lookup (name)) == NULL)
{
return_vals = g_new (Argument, 1);
return_vals->arg_type = PDB_STATUS;
return_vals->value.pdb_int = PDB_CALLING_ERROR;
return return_vals;
}
/* allocate the parameter array */
params = g_new (Argument, proc->num_args);
va_start (args, nreturn_vals);
for (i = 0; i < proc->num_args; i++)
{
if (proc->args[i].arg_type != (params[i].arg_type = va_arg (args, PDBArgType)))
{
g_message (_("Incorrect arguments passed to procedural_db_run_proc:\n"
"Argument %d to '%s' should be a %s, but got passed a %s"),
i+1, proc->name,
pdb_type_name (proc->args[i].arg_type),
pdb_type_name (params[i].arg_type));
g_free (params);
return NULL;
}
switch (proc->args[i].arg_type)
{
case PDB_INT32:
case PDB_INT16:
case PDB_INT8:
case PDB_DISPLAY:
params[i].value.pdb_int = (gint32) va_arg (args, int);
break;
case PDB_FLOAT:
params[i].value.pdb_float = (gdouble) va_arg (args, double);
break;
case PDB_STRING:
case PDB_INT32ARRAY:
case PDB_INT16ARRAY:
case PDB_INT8ARRAY:
case PDB_FLOATARRAY:
case PDB_STRINGARRAY:
case PDB_COLOR:
params[i].value.pdb_pointer = va_arg (args, void *);
break;
case PDB_REGION:
break;
case PDB_IMAGE:
case PDB_LAYER:
case PDB_CHANNEL:
case PDB_DRAWABLE:
case PDB_SELECTION:
case PDB_BOUNDARY:
case PDB_PATH:
params[i].value.pdb_int = (gint32) va_arg (args, int);
break;
case PDB_PARASITE:
params[i].value.pdb_pointer = va_arg (args, void *);
break;
case PDB_STATUS:
params[i].value.pdb_int = (gint32) va_arg (args, int);
break;
case PDB_END:
break;
}
}
va_end (args);
*nreturn_vals = proc->num_values;
return_vals = procedural_db_execute (name, params);
g_free (params);
return return_vals;
}
Argument *
procedural_db_return_args (ProcRecord *procedure,
gboolean success)
{
Argument *return_args;
gint i;
return_args = g_new (Argument, procedure->num_values + 1);
if (success)
{
return_args[0].arg_type = PDB_STATUS;
return_args[0].value.pdb_int = PDB_SUCCESS;
}
else
{
return_args[0].arg_type = PDB_STATUS;
return_args[0].value.pdb_int = PDB_EXECUTION_ERROR;
}
/* Set the arg types for the return values */
for (i = 0; i < procedure->num_values; i++)
return_args[i+1].arg_type = procedure->values[i].arg_type;
return return_args;
}
void
procedural_db_destroy_args (Argument *args,
int nargs)
{
gint i, j;
gint prev_val = 0;
gchar **strs;
if (!args)
return;
for (i = 0; i < nargs; i++)
{
switch (args[i].arg_type)
{
case PDB_INT32:
/* Keep this around in case we need to free an array of strings */
prev_val = args[i].value.pdb_int;
break;
case PDB_INT16:
case PDB_INT8:
case PDB_FLOAT:
break;
case PDB_STRING:
case PDB_INT32ARRAY:
case PDB_INT16ARRAY:
case PDB_INT8ARRAY:
case PDB_FLOATARRAY:
g_free (args[i].value.pdb_pointer);
break;
case PDB_STRINGARRAY:
strs = (gchar **) args[i].value.pdb_pointer;
for (j = 0; j < prev_val; j++)
g_free (strs[j]);
g_free (strs);
break;
case PDB_COLOR:
g_free (args[i].value.pdb_pointer);
break;
case PDB_REGION:
case PDB_DISPLAY:
case PDB_IMAGE:
case PDB_LAYER:
case PDB_CHANNEL:
case PDB_DRAWABLE:
case PDB_SELECTION:
case PDB_BOUNDARY:
case PDB_PATH:
case PDB_PARASITE:
case PDB_STATUS:
case PDB_END:
break;
}
}
g_free (args);
}
/* We could just use g_str_hash() here ... that uses a different
* hash function, though
*/
static guint
procedural_db_hash_func (gconstpointer key)
{
const gchar *string;
guint result;
int c;
/*
* I tried a zillion different hash functions and asked many other
* people for advice. Many people had their own favorite functions,
* all different, but no-one had much idea why they were good ones.
* I chose the one below (multiply by 9 and add new character)
* because of the following reasons:
*
* 1. Multiplying by 10 is perfect for keys that are decimal strings,
* and multiplying by 9 is just about as good.
* 2. Times-9 is (shift-left-3) plus (old). This means that each
* character's bits hang around in the low-order bits of the
* hash value for ever, plus they spread fairly rapidly up to
* the high-order bits to fill out the hash value. This seems
* works well both for decimal and non-decimal strings.
*
* tclHash.c --
*
* Implementation of in-memory hash tables for Tcl and Tcl-based
* applications.
*
* Copyright (c) 1991-1993 The Regents of the University of California.
* Copyright (c) 1994 Sun Microsystems, Inc.
*/
string = (const gchar *) key;
result = 0;
while (1)
{
c = *string;
string++;
if (c == 0)
break;
result += (result << 3) + c;
}
return result;
}
/* The id system's remnants ... */
static gint next_image_id;
/*
static gint next_drawable_id;
static gint next_display_id;
*/
static GHashTable *image_hash;
static GHashTable *drawable_hash;
static GHashTable *display_hash;
static guint
id_hash_func (gconstpointer id)
{
return *((guint*) id);
}
static gboolean
id_cmp_func (gconstpointer id1,
gconstpointer id2)
{
return (*((guint*) id1) == *((guint*) id2));
}
static void
add_cb (GimpSet *set,
GimpImage *gimage,
gpointer data)
{
guint *id;
id = g_new (guint, 1);
*id = next_image_id++;
gtk_object_set_data (GTK_OBJECT (gimage), "pdb_id", id);
g_hash_table_insert (image_hash, id, gimage);
}
static void
remove_cb (GimpSet *set,
GimpImage *image,
gpointer data)
{
guint *id;
id = (guint *) gtk_object_get_data (GTK_OBJECT (image), "pdb_id");
gtk_object_remove_data (GTK_OBJECT(image), "pdb_id");
g_hash_table_remove (image_hash, id);
g_free (id);
}
static void
pdb_id_init (void)
{
image_hash = g_hash_table_new (id_hash_func, id_cmp_func);
drawable_hash = g_hash_table_new (id_hash_func, id_cmp_func);
display_hash = g_hash_table_new (id_hash_func, id_cmp_func);
gtk_signal_connect (GTK_OBJECT (image_context), "add",
GTK_SIGNAL_FUNC (add_cb),
NULL);
gtk_signal_connect (GTK_OBJECT (image_context), "remove",
GTK_SIGNAL_FUNC (remove_cb),
NULL);
}
gint
pdb_image_to_id (GimpImage *gimage)
{
guint *id;
id = (guint *) gtk_object_get_data (GTK_OBJECT (gimage), "pdb_id");
return id ? (gint) *id : -1;
}
GimpImage *
pdb_id_to_image (gint id)
{
return g_hash_table_lookup (image_hash, &id);
}
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