drm_color_mgmt.h
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/*
* 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