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diff --git a/app/core/gimpprojection.h b/app/core/gimpprojection.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_PROJECTION_H__
+#define __GIMP_PROJECTION_H__
+
+
+#include "gimpobject.h"
+
+
+#define GIMP_TYPE_PROJECTION (gimp_projection_get_type ())
+#define GIMP_PROJECTION(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_PROJECTION, GimpProjection))
+#define GIMP_PROJECTION_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_PROJECTION, GimpProjectionClass))
+#define GIMP_IS_PROJECTION(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_PROJECTION))
+#define GIMP_IS_PROJECTION_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_PROJECTION))
+#define GIMP_PROJECTION_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_PROJECTION, GimpProjectionClass))
+
+
+typedef struct _GimpProjectionPrivate GimpProjectionPrivate;
+typedef struct _GimpProjectionClass GimpProjectionClass;
+
+struct _GimpProjection
+{
+ GimpObject parent_instance;
+
+ GimpProjectionPrivate *priv;
+};
+
+struct _GimpProjectionClass
+{
+ GimpObjectClass parent_class;
+
+ void (* update) (GimpProjection *proj,
+ gboolean now,
+ gint x,
+ gint y,
+ gint width,
+ gint height);
+};
+
+
+GType gimp_projection_get_type (void) G_GNUC_CONST;
+
+GimpProjection * gimp_projection_new (GimpProjectable *projectable);
+
+void gimp_projection_set_priority (GimpProjection *projection,
+ gint priority);
+gint gimp_projection_get_priority (GimpProjection *projection);
+
+void gimp_projection_set_priority_rect (GimpProjection *proj,
+ gint x,
+ gint y,
+ gint width,
+ gint height);
+
+void gimp_projection_stop_rendering (GimpProjection *proj);
+
+void gimp_projection_flush (GimpProjection *proj);
+void gimp_projection_flush_now (GimpProjection *proj,
+ gboolean direct);
+void gimp_projection_finish_draw (GimpProjection *proj);
+
+gint64 gimp_projection_estimate_memsize (GimpImageBaseType type,
+ GimpComponentType component_type,
+ gint width,
+ gint height);
+
+
+#endif /* __GIMP_PROJECTION_H__ */