62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#ifndef __DRM_COLOR_MGMT_H__
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#define __DRM_COLOR_MGMT_H__
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#include <linux/ctype.h>
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void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
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uint degamma_lut_size,
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bool has_ctm,
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uint gamma_lut_size);
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int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
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int gamma_size);
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/**
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* drm_color_lut_extract - clamp&round LUT entries
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* @user_input: input value
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* @bit_precision: number of bits the hw LUT supports
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*
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* Extract a degamma/gamma LUT value provided by user (in the form of
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* &drm_color_lut entries) and round it to the precision supported by the
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* hardware.
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*/
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static inline uint32_t drm_color_lut_extract(uint32_t user_input,
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uint32_t bit_precision)
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{
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uint32_t val = user_input;
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uint32_t max = 0xffff >> (16 - bit_precision);
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/* Round only if we're not using full precision. */
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if (bit_precision < 16) {
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val += 1UL << (16 - bit_precision - 1);
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val >>= 16 - bit_precision;
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}
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return clamp_val(val, 0, max);
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}
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#endif
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