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diff --git a/src/blueshift_randr_c.h b/src/blueshift_randr_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_RANDR_C_H
+#define BLUESHIFT_RANDR_C_H
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <inttypes.h>
+
+#include <xcb/xcb.h>
+#include <xcb/randr.h>
+
+
+
+/**
+ * The major version of RandR the program expects
+ */
+#define RANDR_VERSION_MAJOR  1U
+
+/**
+ * The minor version of RandR the program expects
+ */
+#define RANDR_VERSION_MINOR  3U
+
+
+
+/**
+ * Data structure for CRTC caches
+ */
+typedef struct blueshift_randr_crtc
+{
+  /**
+   * Size of colour curves on the X-axis
+   */
+  unsigned int curve_size;
+  
+  /**
+   * CRT controller
+   */
+  xcb_randr_crtc_t* crtc;
+  
+} blueshift_randr_crtc_t;
+
+
+
+/**
+ * Start stage of colour curve control
+ * 
+ * @param   use_screen  The screen to use
+ * @return              Zero on success
+ */
+int blueshift_randr_open(int use_screen);
+
+/**
+ * Gets the current colour curves
+ * 
+ * @param   use_crtc  The CRTC to use
+ * @return            {the size of the red curve, *the red curve,
+ *                    the size of the green curve, *the green curve,
+ *                    the size of the blue curve, *the blue curve},
+ *                    needs to be free:d. `NULL` on error.
+ */
+uint16_t* blueshift_randr_read(int use_crtc);
+
+/**
+ * Apply stage of colour curve control
+ * 
+ * @param   use_crtcs  Mask of CRTC:s to use
+ * @param   r_curve    The red colour curve
+ * @param   g_curve    The green colour curve
+ * @param   b_curve    The blue colour curve
+ * @return             Zero on success
+ */
+int blueshift_randr_apply(uint64_t use_crtcs, uint16_t* r_curve, uint16_t* g_curve, uint16_t* b_curve);
+
+/**
+ * Resource freeing stage of colour curve control
+ */
+void blueshift_randr_close(void);
+
+
+
+#endif
+