Daniel Vetter | f1e2f66 | 2016-09-21 10:59:28 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2016 Intel Corporation |
| 3 | * |
| 4 | * Permission to use, copy, modify, distribute, and sell this software and its |
| 5 | * documentation for any purpose is hereby granted without fee, provided that |
| 6 | * the above copyright notice appear in all copies and that both that copyright |
| 7 | * notice and this permission notice appear in supporting documentation, and |
| 8 | * that the name of the copyright holders not be used in advertising or |
| 9 | * publicity pertaining to distribution of the software without specific, |
| 10 | * written prior permission. The copyright holders make no representations |
| 11 | * about the suitability of this software for any purpose. It is provided "as |
| 12 | * is" without express or implied warranty. |
| 13 | * |
| 14 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| 15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| 16 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| 17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
| 18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| 19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
| 20 | * OF THIS SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | #ifndef __DRM_COLOR_MGMT_H__ |
| 24 | #define __DRM_COLOR_MGMT_H__ |
| 25 | |
| 26 | #include <linux/ctype.h> |
| 27 | |
| 28 | void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc, |
| 29 | uint degamma_lut_size, |
| 30 | bool has_ctm, |
| 31 | uint gamma_lut_size); |
| 32 | |
| 33 | int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc, |
| 34 | int gamma_size); |
| 35 | |
Daniel Vetter | a6acccf | 2016-09-21 10:59:29 +0200 | [diff] [blame] | 36 | /** |
| 37 | * drm_color_lut_extract - clamp&round LUT entries |
| 38 | * @user_input: input value |
| 39 | * @bit_precision: number of bits the hw LUT supports |
| 40 | * |
| 41 | * Extract a degamma/gamma LUT value provided by user (in the form of |
| 42 | * &drm_color_lut entries) and round it to the precision supported by the |
| 43 | * hardware. |
Daniel Vetter | f1e2f66 | 2016-09-21 10:59:28 +0200 | [diff] [blame] | 44 | */ |
| 45 | static inline uint32_t drm_color_lut_extract(uint32_t user_input, |
| 46 | uint32_t bit_precision) |
| 47 | { |
| 48 | uint32_t val = user_input; |
| 49 | uint32_t max = 0xffff >> (16 - bit_precision); |
| 50 | |
| 51 | /* Round only if we're not using full precision. */ |
| 52 | if (bit_precision < 16) { |
| 53 | val += 1UL << (16 - bit_precision - 1); |
| 54 | val >>= 16 - bit_precision; |
| 55 | } |
| 56 | |
| 57 | return clamp_val(val, 0, max); |
| 58 | } |
| 59 | |
| 60 | |
| 61 | #endif |