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diff --git a/src/shell-blur-effect.h b/src/shell-blur-effect.h
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+/* shell-blur-effect.h
+ *
+ * Copyright 2019 Georges Basile Stavracas Neto <georges.stavracas@gmail.com>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include <clutter/clutter.h>
+
+G_BEGIN_DECLS
+
+/**
+ * ShellBlurMode:
+ * @SHELL_BLUR_MODE_ACTOR: blur the actor contents, and its children
+ * @SHELL_BLUR_MODE_BACKGROUND: blur what's beneath the actor
+ *
+ * The mode of blurring of the effect.
+ */
+typedef enum
+{
+  SHELL_BLUR_MODE_ACTOR,
+  SHELL_BLUR_MODE_BACKGROUND,
+} ShellBlurMode;
+
+#define SHELL_TYPE_BLUR_EFFECT (shell_blur_effect_get_type())
+G_DECLARE_FINAL_TYPE (ShellBlurEffect, shell_blur_effect, SHELL, BLUR_EFFECT, ClutterEffect)
+
+ShellBlurEffect *shell_blur_effect_new (void);
+
+int shell_blur_effect_get_sigma (ShellBlurEffect *self);
+void shell_blur_effect_set_sigma (ShellBlurEffect *self,
+                                  int              sigma);
+
+float shell_blur_effect_get_brightness (ShellBlurEffect *self);
+void shell_blur_effect_set_brightness (ShellBlurEffect *self,
+                                       float            brightness);
+
+ShellBlurMode shell_blur_effect_get_mode (ShellBlurEffect *self);
+void shell_blur_effect_set_mode (ShellBlurEffect *self,
+                                 ShellBlurMode    mode);
+
+G_END_DECLS