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gimp/libgimp/gimpprogress.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimpprogress.c
*
* 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 2 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
* Library 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <glib-object.h>
#undef GIMP_DISABLE_DEPRECATED
#include "gimpprogress.h"
#define GIMP_DISABLE_DEPRECATED
#include "gimp.h"
typedef struct
{
gchar *progress_callback;
GimpProgressVtable vtable;
gpointer data;
} GimpProgressData;
/* local function prototypes */
static void gimp_progress_data_free (GimpProgressData *data);
static void gimp_temp_progress_run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
/* private variables */
static GHashTable * gimp_progress_ht = NULL;
static gdouble gimp_progress_current = 0.0;
static const gdouble gimp_progress_step = (1.0 / 256.0);
/* public functions */
/**
* gimp_progress_install:
* @start_callback: the function to call when progress starts
* @end_callback: the function to call when progress finishes
* @text_callback: the function to call to change the text
* @value_callback: the function to call to change the value
* @user_data: a pointer that is returned when uninstalling the progress
*
* Return value: the name of the temporary procedure that's been installed
*
* Since: GIMP 2.2
*
* Note that since GIMP 2.4, @value_callback can be called with
* negative values. This is triggered by calls to gimp_progress_pulse().
* The callback should then implement a progress indicating business,
* e.g. by calling gtk_progress_bar_pulse().
**/
const gchar *
gimp_progress_install (GimpProgressStartCallback start_callback,
GimpProgressEndCallback end_callback,
GimpProgressTextCallback text_callback,
GimpProgressValueCallback value_callback,
gpointer user_data)
{
GimpProgressVtable vtable = { 0, };
g_return_val_if_fail (start_callback != NULL, NULL);
g_return_val_if_fail (end_callback != NULL, NULL);
g_return_val_if_fail (text_callback != NULL, NULL);
g_return_val_if_fail (value_callback != NULL, NULL);
vtable.start = start_callback;
vtable.end = end_callback;
vtable.set_text = text_callback;
vtable.set_value = value_callback;
return gimp_progress_install_vtable (&vtable, user_data);
}
/**
* gimp_progress_install_vtable:
* @vtable: a pointer to a @GimpProgressVtable.
* @user_data: a pointer that is passed as user_data to all vtable functions.
*
* Return value: the name of the temporary procedure that's been installed
*
* Since: GIMP 2.4
**/
const gchar *
gimp_progress_install_vtable (const GimpProgressVtable *vtable,
gpointer user_data)
{
static const GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "command", "" },
{ GIMP_PDB_STRING, "text", "" },
{ GIMP_PDB_FLOAT, "value", "" }
};
static const GimpParamDef values[] =
{
{ GIMP_PDB_FLOAT, "value", "" }
};
gchar *progress_callback;
g_return_val_if_fail (vtable != NULL, NULL);
g_return_val_if_fail (vtable->start != NULL, NULL);
g_return_val_if_fail (vtable->end != NULL, NULL);
g_return_val_if_fail (vtable->set_text != NULL, NULL);
g_return_val_if_fail (vtable->set_value != NULL, NULL);
progress_callback = gimp_procedural_db_temp_name ();
gimp_install_temp_proc (progress_callback,
"Temporary progress callback procedure",
"",
"",
"",
"",
NULL,
"",
GIMP_TEMPORARY,
G_N_ELEMENTS (args), G_N_ELEMENTS (values),
args, values,
gimp_temp_progress_run);
if (_gimp_progress_install (progress_callback))
{
GimpProgressData *progress_data;
gimp_extension_enable (); /* Allow callbacks to be watched */
/* Now add to hash table so we can find it again */
if (! gimp_progress_ht)
{
gimp_progress_ht =
g_hash_table_new_full (g_str_hash, g_str_equal,
g_free,
(GDestroyNotify) gimp_progress_data_free);
}
progress_data = g_slice_new0 (GimpProgressData);
progress_data->progress_callback = progress_callback;
progress_data->vtable.start = vtable->start;
progress_data->vtable.end = vtable->end;
progress_data->vtable.set_text = vtable->set_text;
progress_data->vtable.set_value = vtable->set_value;
progress_data->vtable.pulse = vtable->pulse;
progress_data->vtable.get_window = vtable->get_window;
progress_data->data = user_data;
g_hash_table_insert (gimp_progress_ht, progress_callback, progress_data);
return progress_callback;
}
gimp_uninstall_temp_proc (progress_callback);
g_free (progress_callback);
return NULL;
}
/**
* gimp_progress_uninstall:
* @progress_callback: the name of the temporary procedure to uninstall
*
* Uninstalls a temporary progress procedure that was installed using
* gimp_progress_install().
*
* Return value: the @user_data that was passed to gimp_progress_install().
*
* Since: GIMP 2.2
**/
gpointer
gimp_progress_uninstall (const gchar *progress_callback)
{
GimpProgressData *progress_data;
gpointer user_data;
g_return_val_if_fail (progress_callback != NULL, NULL);
g_return_val_if_fail (gimp_progress_ht != NULL, NULL);
progress_data = g_hash_table_lookup (gimp_progress_ht, progress_callback);
if (! progress_data)
{
g_warning ("Can't find internal progress data");
return NULL;
}
_gimp_progress_uninstall (progress_callback);
gimp_uninstall_temp_proc (progress_callback);
user_data = progress_data->data;
g_hash_table_remove (gimp_progress_ht, progress_callback);
return user_data;
}
/**
* gimp_progress_init:
* @message: Message to use in the progress dialog.
*
* Initializes the progress bar for the current plug-in.
*
* Initializes the progress bar for the current plug-in. It is only
* valid to call this procedure from a plug-in.
*
* Returns: TRUE on success.
*/
gboolean
gimp_progress_init (const gchar *message)
{
gimp_progress_current = 0.0;
return _gimp_progress_init (message, gimp_default_display ());
}
/**
* gimp_progress_init_printf:
* @format: a standard printf() format string
* @Varargs: arguments for @format
*
* Initializes the progress bar for the current plug-in.
*
* Initializes the progress bar for the current plug-in. It is only
* valid to call this procedure from a plug-in.
*
* Returns: %TRUE on success.
*
* Since: GIMP 2.4
**/
gboolean
gimp_progress_init_printf (const gchar *format,
...)
{
gchar *text;
gboolean retval;
va_list args;
g_return_val_if_fail (format != NULL, FALSE);
va_start (args, format);
text = g_strdup_vprintf (format, args);
va_end (args);
retval = gimp_progress_init (text);
g_free (text);
return retval;
}
/**
* gimp_progress_set_text_printf:
* @format: a standard printf() format string
* @Varargs: arguments for @format
*
* Changes the text in the progress bar for the current plug-in.
*
* This function allows to change the text in the progress bar for the
* current plug-in. Unlike gimp_progress_init() it does not change the
* displayed value.
*
* Returns: %TRUE on success.
*
* Since: GIMP 2.4
**/
gboolean
gimp_progress_set_text_printf (const gchar *format,
...)
{
gchar *text;
gboolean retval;
va_list args;
g_return_val_if_fail (format != NULL, FALSE);
va_start (args, format);
text = g_strdup_vprintf (format, args);
va_end (args);
retval = gimp_progress_set_text (text);
g_free (text);
return retval;
}
/**
* gimp_progress_update:
* @percentage: Percentage of progress completed (in the range from 0.0 to 1.0).
*
* Updates the progress bar for the current plug-in.
*
* Returns: TRUE on success.
*/
gboolean
gimp_progress_update (gdouble percentage)
{
gboolean changed;
if (percentage <= 0.0)
{
changed = (gimp_progress_current != 0.0);
percentage = 0.0;
}
else if (percentage >= 1.0)
{
changed = (gimp_progress_current != 1.0);
percentage = 1.0;
}
else
{
changed =
(fabs (gimp_progress_current - percentage) > gimp_progress_step);
#ifdef GIMP_UNSTABLE
if (! changed)
{
static gboolean warned = FALSE;
static gint count = 0;
count++;
if (count > 3 && ! warned)
{
g_printerr ("%s is updating the progress too often\n",
g_get_prgname ());
warned = TRUE;
}
}
#endif
}
/* Suppress the update if the change was only marginal. */
if (! changed)
return TRUE;
gimp_progress_current = percentage;
return _gimp_progress_update (gimp_progress_current);
}
/* private functions */
static void
gimp_progress_data_free (GimpProgressData *data)
{
g_slice_free (GimpProgressData, data);
}
static void
gimp_temp_progress_run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[2];
GimpProgressData *progress_data;
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = GIMP_PDB_SUCCESS;
progress_data = g_hash_table_lookup (gimp_progress_ht, name);
if (! progress_data)
{
g_warning ("Can't find internal progress data");
values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;
}
else
{
GimpProgressCommand command = param[0].data.d_int32;
switch (command)
{
case GIMP_PROGRESS_COMMAND_START:
progress_data->vtable.start (param[1].data.d_string,
param[2].data.d_float != 0.0,
progress_data->data);
break;
case GIMP_PROGRESS_COMMAND_END:
progress_data->vtable.end (progress_data->data);
break;
case GIMP_PROGRESS_COMMAND_SET_TEXT:
progress_data->vtable.set_text (param[1].data.d_string,
progress_data->data);
break;
case GIMP_PROGRESS_COMMAND_SET_VALUE:
progress_data->vtable.set_value (param[2].data.d_float,
progress_data->data);
break;
case GIMP_PROGRESS_COMMAND_PULSE:
if (progress_data->vtable.pulse)
progress_data->vtable.pulse (progress_data->data);
else
progress_data->vtable.set_value (-1, progress_data->data);
break;
case GIMP_PROGRESS_COMMAND_GET_WINDOW:
*nreturn_vals = 2;
values[1].type = GIMP_PDB_FLOAT;
if (progress_data->vtable.get_window)
values[1].data.d_float =
(gdouble) progress_data->vtable.get_window (progress_data->data);
else
values[1].data.d_float = 0;
break;
default:
values[0].data.d_status = GIMP_PDB_CALLING_ERROR;
break;
}
}
}
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