root/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c

DEFINITIONS

1. komeda_select_yuv2rgb_coeffs

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * (C) COPYRIGHT 2019 ARM Limited. All rights reserved.
   4  * Author: James.Qian.Wang <james.qian.wang@arm.com>
   5  *
   6  */
   7 
   8 #include "komeda_color_mgmt.h"
   9 
  10 /* 10bit precision YUV2RGB matrix */
  11 static const s32 yuv2rgb_bt601_narrow[KOMEDA_N_YUV2RGB_COEFFS] = {
  12         1192,    0, 1634,
  13         1192, -401, -832,
  14         1192, 2066,    0,
  15           64,  512,  512
  16 };
  17 
  18 static const s32 yuv2rgb_bt601_wide[KOMEDA_N_YUV2RGB_COEFFS] = {
  19         1024,    0, 1436,
  20         1024, -352, -731,
  21         1024, 1815,    0,
  22            0,  512,  512
  23 };
  24 
  25 static const s32 yuv2rgb_bt709_narrow[KOMEDA_N_YUV2RGB_COEFFS] = {
  26         1192,    0, 1836,
  27         1192, -218, -546,
  28         1192, 2163,    0,
  29           64,  512,  512
  30 };
  31 
  32 static const s32 yuv2rgb_bt709_wide[KOMEDA_N_YUV2RGB_COEFFS] = {
  33         1024,    0, 1613,
  34         1024, -192, -479,
  35         1024, 1900,    0,
  36            0,  512,  512
  37 };
  38 
  39 static const s32 yuv2rgb_bt2020[KOMEDA_N_YUV2RGB_COEFFS] = {
  40         1024,    0, 1476,
  41         1024, -165, -572,
  42         1024, 1884,    0,
  43            0,  512,  512
  44 };
  45 
  46 const s32 *komeda_select_yuv2rgb_coeffs(u32 color_encoding, u32 color_range)
  47 {
  48         bool narrow = color_range == DRM_COLOR_YCBCR_LIMITED_RANGE;
  49         const s32 *coeffs;
  50 
  51         switch (color_encoding) {
  52         case DRM_COLOR_YCBCR_BT709:
  53                 coeffs = narrow ? yuv2rgb_bt709_narrow : yuv2rgb_bt709_wide;
  54                 break;
  55         case DRM_COLOR_YCBCR_BT601:
  56                 coeffs = narrow ? yuv2rgb_bt601_narrow : yuv2rgb_bt601_wide;
  57                 break;
  58         case DRM_COLOR_YCBCR_BT2020:
  59                 coeffs = yuv2rgb_bt2020;
  60                 break;
  61         default:
  62                 coeffs = NULL;
  63                 break;
  64         }
  65 
  66         return coeffs;
  67 }