/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Support for Intel Camera Imaging ISP subsystem.
 * Copyright (c) 2015, Intel Corporation.
 */

#ifndef __IA_CSS_CSC_TYPES_H
#define __IA_CSS_CSC_TYPES_H

/* @file
* CSS-API header file for Color Space Conversion parameters.
*/

/* Color Correction configuration.
 *
 *  This structure is used for 3 cases.
 *  ("YCgCo" is the output format of Demosaic.)
 *
 *  1. Color Space Conversion (YCgCo to YUV) for ISP1.
 *     ISP block: CSC1 (Color Space Conversion)
 *     struct ia_css_cc_config   *cc_config
 *
 *  2. Color Correction Matrix (YCgCo to RGB) for ISP2.
 *     ISP block: CCM2 (Color Correction Matrix)
 *     struct ia_css_cc_config   *yuv2rgb_cc_config
 *
 *  3. Color Space Conversion (RGB to YUV) for ISP2.
 *     ISP block: CSC2 (Color Space Conversion)
 *     struct ia_css_cc_config   *rgb2yuv_cc_config
 *
 *  default/ineffective:
 *  1. YCgCo -> YUV
 *      1       0.174           0.185
 *      0       -0.66252        -0.66874
 *      0       -0.83738        0.58131
 *
 *      fraction_bits = 12
 *      4096    713     758
 *      0       -2714   -2739
 *      0       -3430   2381
 *
 *  2. YCgCo -> RGB
 *      1       -1      1
 *      1       1       0
 *      1       -1      -1
 *
 *      fraction_bits = 12
 *      4096    -4096   4096
 *      4096    4096    0
 *      4096    -4096   -4096
 *
 *  3. RGB -> YUV
 *      0.299      0.587        0.114
 *      -0.16874   -0.33126     0.5
 *      0.5        -0.41869     -0.08131
 *
 *      fraction_bits = 13
 *      2449    4809    934
 *      -1382   -2714   4096
 *      4096    -3430   -666
 */
struct ia_css_cc_config {
        u32 fraction_bits;/** Fractional bits of matrix.
                                        u8.0, [0,13] */
        s32 matrix[3 * 3]; /** Conversion matrix.
                                        s[13-fraction_bits].[fraction_bits],
                                        [-8192,8191] */
};

#endif /* __IA_CSS_CSC_TYPES_H */