text: /* See LICENSE file for copyright and license details. */
  #define IN_LIBGAMMA_LINUX_DRM
  #include "common.h"
  
  
  /**
   * Get the current gamma ramps for a CRTC, 16-bit gamma-depth version
   * 
   * @param   this   The CRTC state
   * @param   ramps  The gamma ramps to fill with the current values
   * @return         Zero on success, otherwise (negative) the value of an
   *                 error identifier provided by this library
   */
  int
  libgamma_linux_drm_crtc_get_gamma_ramps16(struct libgamma_crtc_state *restrict this, struct libgamma_gamma_ramps16 *restrict ramps)
  {
  	struct libgamma_drm_card_data *restrict card = this->partition->data;
  	int r;
  #ifdef DEBUG
  	/* Gamma ramp sizes are identical but not fixed */
  	if (ramps->red_size != ramps->green_size || ramps->red_size != ramps->blue_size)
  		return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE;
  #endif
  	/* Read current gamma ramps */
  	r = drmModeCrtcGetGamma(card->fd, (uint32_t)(size_t)this->data, (uint32_t)ramps->red_size,
  				ramps->red, ramps->green, ramps->blue);
  	return r ? LIBGAMMA_GAMMA_RAMP_READ_FAILED : 0;
  }
  