1 files changed, 160 insertions, 0 deletions
diff --git a/app/core/gimp-filter-history.c b/app/core/gimp-filter-history.c
new file mode 100644
index 0000000..afdd6ed
--- /dev/null
+++ b/app/core/gimp-filter-history.c
@@ -0,0 +1,160 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-2003 Spencer Kimball and Peter Mattis
+ *
+ * gimp-filter-history.c
+ *
+ * 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 <string.h>
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpbase/gimpbase.h"
+
+#include "core-types.h"
+
+#include "config/gimpcoreconfig.h"
+
+#include "gimp.h"
+#include "gimp-filter-history.h"
+
+#include "pdb/gimpprocedure.h"
+
+
+/*  local function prototypes  */
+
+static gint   gimp_filter_history_compare (GimpProcedure *proc1,
+                                           GimpProcedure *proc2);
+
+
+/*  public functions  */
+
+gint
+gimp_filter_history_size (Gimp *gimp)
+{
+  g_return_val_if_fail (GIMP_IS_GIMP (gimp), 0);
+
+  return MAX (1, gimp->config->filter_history_size);
+}
+
+gint
+gimp_filter_history_length (Gimp *gimp)
+{
+  g_return_val_if_fail (GIMP_IS_GIMP (gimp), 0);
+
+  return g_list_length (gimp->filter_history);
+}
+
+GimpProcedure *
+gimp_filter_history_nth (Gimp  *gimp,
+                         gint   n)
+{
+  g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);
+
+  return g_list_nth_data (gimp->filter_history, n);
+}
+
+void
+gimp_filter_history_add (Gimp          *gimp,
+                         GimpProcedure *procedure)
+{
+  GList *link;
+
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+  g_return_if_fail (GIMP_IS_PROCEDURE (procedure));
+
+  /* return early if the procedure is already at the top */
+  if (gimp->filter_history &&
+      gimp_filter_history_compare (gimp->filter_history->data, procedure) == 0)
+    return;
+
+  /* ref new first then unref old, they might be the same */
+  g_object_ref (procedure);
+
+  link = g_list_find_custom (gimp->filter_history, procedure,
+                             (GCompareFunc) gimp_filter_history_compare);
+
+  if (link)
+    {
+      g_object_unref (link->data);
+      gimp->filter_history = g_list_delete_link (gimp->filter_history, link);
+    }
+
+  gimp->filter_history = g_list_prepend (gimp->filter_history, procedure);
+
+  link = g_list_nth (gimp->filter_history, gimp_filter_history_size (gimp));
+
+  if (link)
+    {
+      g_object_unref (link->data);
+      gimp->filter_history = g_list_delete_link (gimp->filter_history, link);
+    }
+
+  gimp_filter_history_changed (gimp);
+}
+
+void
+gimp_filter_history_remove (Gimp          *gimp,
+                            GimpProcedure *procedure)
+{
+  GList *link;
+
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+  g_return_if_fail (GIMP_IS_PROCEDURE (procedure));
+
+  link = g_list_find_custom (gimp->filter_history, procedure,
+                             (GCompareFunc) gimp_filter_history_compare);
+
+  if (link)
+    {
+      g_object_unref (link->data);
+      gimp->filter_history = g_list_delete_link (gimp->filter_history, link);
+
+      gimp_filter_history_changed (gimp);
+    }
+}
+
+void
+gimp_filter_history_clear (Gimp *gimp)
+{
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+
+  if (gimp->filter_history)
+    {
+      g_list_free_full (gimp->filter_history, (GDestroyNotify) g_object_unref);
+      gimp->filter_history = NULL;
+
+      gimp_filter_history_changed (gimp);
+    }
+}
+
+
+/*  private functions  */
+
+static gint
+gimp_filter_history_compare (GimpProcedure *proc1,
+                             GimpProcedure *proc2)
+{
+  /*  the procedures can have the same name, but could still be two
+   *  different filters using the same operation, so also compare
+   *  their menu labels
+   */
+  return (gimp_procedure_name_compare (proc1, proc2) ||
+          strcmp (gimp_procedure_get_menu_label (proc1),
+                  gimp_procedure_get_menu_label (proc2)));
+}