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

// SPDX-License-Identifier: GPL-2.0
/*
 * (C) COPYRIGHT 2019 ARM Limited. All rights reserved.
 * Author: James.Qian.Wang <james.qian.wang@arm.com>
 *
 */

#include "komeda_color_mgmt.h"

/* 10bit precision YUV2RGB matrix */
static const s32 yuv2rgb_bt601_narrow[KOMEDA_N_YUV2RGB_COEFFS] = {
	1192,    0, 1634,
	1192, -401, -832,
	1192, 2066,    0,
	  64,  512,  512
};

static const s32 yuv2rgb_bt601_wide[KOMEDA_N_YUV2RGB_COEFFS] = {
	1024,    0, 1436,
	1024, -352, -731,
	1024, 1815,    0,
	   0,  512,  512
};

static const s32 yuv2rgb_bt709_narrow[KOMEDA_N_YUV2RGB_COEFFS] = {
	1192,    0, 1836,
	1192, -218, -546,
	1192, 2163,    0,
	  64,  512,  512
};

static const s32 yuv2rgb_bt709_wide[KOMEDA_N_YUV2RGB_COEFFS] = {
	1024,    0, 1613,
	1024, -192, -479,
	1024, 1900,    0,
	   0,  512,  512
};

static const s32 yuv2rgb_bt2020[KOMEDA_N_YUV2RGB_COEFFS] = {
	1024,    0, 1476,
	1024, -165, -572,
	1024, 1884,    0,
	   0,  512,  512
};

const s32 *komeda_select_yuv2rgb_coeffs(u32 color_encoding, u32 color_range)
{
	bool narrow = color_range == DRM_COLOR_YCBCR_LIMITED_RANGE;
	const s32 *coeffs;

	switch (color_encoding) {
	case DRM_COLOR_YCBCR_BT709:
		coeffs = narrow ? yuv2rgb_bt709_narrow : yuv2rgb_bt709_wide;
		break;
	case DRM_COLOR_YCBCR_BT601:
		coeffs = narrow ? yuv2rgb_bt601_narrow : yuv2rgb_bt601_wide;
		break;
	case DRM_COLOR_YCBCR_BT2020:
		coeffs = yuv2rgb_bt2020;
		break;
	default:
		coeffs = NULL;
		break;
	}

	return coeffs;
}