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diff --git a/src/blueshift_quartz_c.h b/src/blueshift_quartz_c.h
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+/**
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * 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/>.
+ */
+#ifndef BLUESHIFT_QUARTZ_C_H
+#define BLUESHIFT_QUARTZ_C_H
+
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifdef FAKE_QUARTZ
+#  include "fake_quartz.h"
+#else
+#  include <CoreGraphics/CGDirectDisplay.h>
+#endif
+
+
+
+/**
+ * Start stage of colour curve control
+ * 
+ * @return  Zero on success
+ */
+int blueshift_quartz_open(void);
+
+/**
+ * Get the number of CRTC:s on the system
+ * 
+ * @return  The number of CRTC:s on the system
+ */
+int blueshift_quartz_crtc_count(void);
+
+/**
+ * Gets the current colour curves
+ * 
+ * @param   use_crtc  The CRTC to use
+ * @return            {the size of the each curve, *the red curve,
+ *                    *the green curve, *the blue curve},
+ *                    needs to be free:d. `NULL` on error.
+ */
+uint16_t* blueshift_quartz_read(int use_crtc);
+
+/**
+ * Apply stage of colour curve control
+ * 
+ * @param   use_crtc   The CRTC to use, -1 for all
+ * @param   rgb_curve  The concatenation of the red, the green and the blue colour curves
+ * @return             Zero on success
+ */
+int blueshift_quartz_apply(int use_crtc, uint16_t* rgb_curves);
+
+/**
+ * Resource freeing stage of colour curve control
+ */
+void blueshift_quartz_close(void);
+
+
+#endif
+