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diff --git a/app/tools/gimpgradienttool.h b/app/tools/gimpgradienttool.h
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+/* GIMP - The GNU 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 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/>.
+ */
+
+#ifndef __GIMP_GRADIENT_TOOL_H__
+#define __GIMP_GRADIENT_TOOL_H__
+
+
+#include "gimpdrawtool.h"
+
+
+#define GIMP_TYPE_GRADIENT_TOOL (gimp_gradient_tool_get_type ())
+#define GIMP_GRADIENT_TOOL(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_GRADIENT_TOOL, GimpGradientTool))
+#define GIMP_GRADIENT_TOOL_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_GRADIENT_TOOL, GimpGradientToolClass))
+#define GIMP_IS_GRADIENT_TOOL(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_GRADIENT_TOOL))
+#define GIMP_IS_GRADIENT_TOOL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_GRADIENT_TOOL))
+#define GIMP_GRADIENT_TOOL_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_GRADIENT_TOOL, GimpGradientToolClass))
+
+#define GIMP_GRADIENT_TOOL_GET_OPTIONS(t) (GIMP_GRADIENT_OPTIONS (gimp_tool_get_options (GIMP_TOOL (t))))
+
+
+typedef struct _GimpGradientTool GimpGradientTool;
+typedef struct _GimpGradientToolClass GimpGradientToolClass;
+
+struct _GimpGradientTool
+{
+ GimpDrawTool parent_instance;
+
+ GimpGradient *gradient;
+ GimpGradient *tentative_gradient;
+
+ gdouble start_x; /* starting x coord */
+ gdouble start_y; /* starting y coord */
+ gdouble end_x; /* ending x coord */
+ gdouble end_y; /* ending y coord */
+
+ GimpToolWidget *widget;
+ GimpToolWidget *grab_widget;
+
+ GeglNode *graph;
+ GeglNode *render_node;
+#if 0
+ GeglNode *subtract_node;
+ GeglNode *divide_node;
+#endif
+ GeglNode *dist_node;
+ GeglBuffer *dist_buffer;
+ GimpDrawableFilter *filter;
+
+ /* editor */
+
+ gint block_handlers_count;
+
+ gint edit_count;
+ GSList *undo_stack;
+ GSList *redo_stack;
+
+ guint flush_idle_id;
+
+ GimpToolGui *gui;
+ GtkWidget *endpoint_editor;
+ GtkWidget *endpoint_se;
+ GtkWidget *endpoint_color_panel;
+ GtkWidget *endpoint_type_combo;
+ GtkWidget *stop_editor;
+ GtkWidget *stop_se;
+ GtkWidget *stop_left_color_panel;
+ GtkWidget *stop_left_type_combo;
+ GtkWidget *stop_right_color_panel;
+ GtkWidget *stop_right_type_combo;
+ GtkWidget *stop_chain_button;
+ GtkWidget *midpoint_editor;
+ GtkWidget *midpoint_se;
+ GtkWidget *midpoint_type_combo;
+ GtkWidget *midpoint_color_combo;
+ GtkWidget *midpoint_new_stop_button;
+ GtkWidget *midpoint_center_button;
+};
+
+struct _GimpGradientToolClass
+{
+ GimpDrawToolClass parent_class;
+};
+
+
+void gimp_gradient_tool_register (GimpToolRegisterCallback callback,
+ gpointer data);
+
+GType gimp_gradient_tool_get_type (void) G_GNUC_CONST;
+
+
+/* protected functions */
+
+void gimp_gradient_tool_set_tentative_gradient (GimpGradientTool *gradient_tool,
+ GimpGradient *gradient);
+
+
+#endif /* __GIMP_GRADIENT_TOOL_H__ */