/*
   * Copyright (c) 2016 Intel Corporation
   *
   * Permission to use, copy, modify, distribute, and sell this software and its
   * documentation for any purpose is hereby granted without fee, provided that
   * the above copyright notice appear in all copies and that both that copyright
   * notice and this permission notice appear in supporting documentation, and
   * that the name of the copyright holders not be used in advertising or
   * publicity pertaining to distribution of the software without specific,
   * written prior permission.  The copyright holders make no representations
   * about the suitability of this software for any purpose.  It is provided "as
   * is" without express or implied warranty.
   *
   * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
   * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
   * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
   * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
   * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
   * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
   * OF THIS SOFTWARE.
   */
  
  #ifndef __DRM_COLOR_MGMT_H__
  #define __DRM_COLOR_MGMT_H__
  
  #include <linux/ctype.h>
  
  void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
  				uint degamma_lut_size,
  				bool has_ctm,
  				uint gamma_lut_size);
  
  int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
  				 int gamma_size);

  /**
   * drm_color_lut_extract - clamp&round LUT entries
   * @user_input: input value
   * @bit_precision: number of bits the hw LUT supports
   *
   * Extract a degamma/gamma LUT value provided by user (in the form of
   * &drm_color_lut entries) and round it to the precision supported by the
   * hardware.

   */
  static inline uint32_t drm_color_lut_extract(uint32_t user_input,
  					     uint32_t bit_precision)
  {
  	uint32_t val = user_input;
  	uint32_t max = 0xffff >> (16 - bit_precision);
  
  	/* Round only if we're not using full precision. */
  	if (bit_precision < 16) {
  		val += 1UL << (16 - bit_precision - 1);
  		val >>= 16 - bit_precision;
  	}
  
  	return clamp_val(val, 0, max);
  }
  
  
  #endif