[gimp] libgimp: add gimp_get_num_processors().

[Jehan <jehanp src gnome org>]

commit 698b7184b22017a24fe7fa2032edf5fa35cb9615
Author: Jehan <jehan girinstud io>
Date:   Fri Dec 11 18:24:36 2020 +0100

    libgimp: add gimp_get_num_processors().

 libgimp/gimp.c   | 19 +++++++++++++++++++
 libgimp/gimp.def |  1 +
 libgimp/gimp.h   |  1 +
 3 files changed, 21 insertions(+)
---
diff --git a/libgimp/gimp.c b/libgimp/gimp.c
index e964e263e5..25500c72d0 100644
--- a/libgimp/gimp.c
+++ b/libgimp/gimp.c
@@ -145,6 +145,7 @@ static gboolean            _export_comment       = FALSE;
 static gboolean            _export_exif          = FALSE;
 static gboolean            _export_xmp           = FALSE;
 static gboolean            _export_iptc          = FALSE;
+static gint32              _num_processors       = 1;
 static GimpCheckSize       _check_size           = GIMP_CHECK_SIZE_MEDIUM_CHECKS;
 static GimpCheckType       _check_type           = GIMP_CHECK_TYPE_GRAY_CHECKS;
 static gint                _default_display_id   = -1;
@@ -782,6 +783,23 @@ gimp_export_iptc (void)
   return _export_iptc;
 }
 
+/**
+ * gimp_get_num_processors:
+ *
+ * Returns the number of threads set explicitly by the user in the
+ * preferences. This information can be used by plug-ins wishing to
+ * follow user settings for multi-threaded implementations.
+ *
+ * Returns: the prefered number of threads to use.
+ *
+ * Since: 3.0
+ **/
+gint32
+gimp_get_num_processors (void)
+{
+  return _num_processors;
+}
+
 /**
  * gimp_check_size:
  *
@@ -1132,6 +1150,7 @@ _gimp_config (GPConfig *config)
   _export_xmp           = config->export_xmp       ? TRUE : FALSE;
   _export_iptc          = config->export_iptc      ? TRUE : FALSE;
   _export_comment       = config->export_comment;
+  _num_processors       = config->num_processors;
   _default_display_id   = config->default_display_id;
   _wm_class             = g_strdup (config->wm_class);
   _display_name         = g_strdup (config->display_name);
diff --git a/libgimp/gimp.def b/libgimp/gimp.def
index 32fa15e3bb..b999ba9f34 100644
--- a/libgimp/gimp.def
+++ b/libgimp/gimp.def
@@ -294,6 +294,7 @@ EXPORTS
        gimp_get_images
        gimp_get_module_load_inhibit
        gimp_get_monitor_resolution
+       gimp_get_num_processors
        gimp_get_parasite
        gimp_get_parasite_list
        gimp_get_pdb
diff --git a/libgimp/gimp.h b/libgimp/gimp.h
index 71649bd026..9686719875 100644
--- a/libgimp/gimp.h
+++ b/libgimp/gimp.h
@@ -178,6 +178,7 @@ gboolean            gimp_export_comment       (void) G_GNUC_CONST;
 gboolean            gimp_export_exif          (void) G_GNUC_CONST;
 gboolean            gimp_export_xmp           (void) G_GNUC_CONST;
 gboolean            gimp_export_iptc          (void) G_GNUC_CONST;
+gint                gimp_get_num_processors   (void) G_GNUC_CONST;
 GimpCheckSize       gimp_check_size           (void) G_GNUC_CONST;
 GimpCheckType       gimp_check_type           (void) G_GNUC_CONST;
 GimpDisplay       * gimp_default_display      (void) G_GNUC_CONST;