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/*
* Copyright © 2018 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "igt_color_encoding.h"
#include "igt_matrix.h"
#include "igt_core.h"
struct color_encoding {
float kr, kb;
};
static const struct color_encoding color_encodings[IGT_NUM_COLOR_ENCODINGS] = {
[IGT_COLOR_YCBCR_BT601] = { .kr = .299f, .kb = .114f, },
[IGT_COLOR_YCBCR_BT709] = { .kr = .2126f, .kb = .0722f, },
[IGT_COLOR_YCBCR_BT2020] = { .kr = .2627f, .kb = .0593f, },
};
static struct igt_mat4 rgb_to_ycbcr_matrix(const struct color_encoding *e)
{
float kr = e->kr;
float kb = e->kb;
float kg = 1.0f - kr - kb;
struct igt_mat4 ret = {
.d[m(0, 0)] = kr,
.d[m(0, 1)] = kg,
.d[m(0, 2)] = kb,
.d[m(1, 0)] = -kr / (1.0f - kb),
.d[m(1, 1)] = -kg / (1.0f - kb),
.d[m(1, 2)] = 1.0f,
.d[m(2, 0)] = 1.0f,
.d[m(2, 1)] = -kg / (1.0f - kr),
.d[m(2, 2)] = -kb / (1.0f - kr),
.d[m(3, 3)] = 1.0f,
};
return ret;
}
static struct igt_mat4 ycbcr_to_rgb_matrix(const struct color_encoding *e)
{
float kr = e->kr;
float kb = e->kb;
float kg = 1.0f - kr - kb;
struct igt_mat4 ret = {
.d[m(0, 0)] = 1.0f,
.d[m(0, 1)] = 0.0f,
.d[m(0, 2)] = 1.0 - kr,
.d[m(1, 0)] = 1.0f,
.d[m(1, 1)] = -(1.0 - kb) * kb / kg,
.d[m(1, 2)] = -(1.0 - kr) * kr / kg,
.d[m(2, 0)] = 1.0f,
.d[m(2, 1)] = 1.0 - kb,
.d[m(2, 2)] = 0.0f,
.d[m(3, 3)] = 1.0f,
};
return ret;
}
static struct igt_mat4 ycbcr_input_convert_matrix(enum igt_color_range color_range)
{
struct igt_mat4 t, s;
if (color_range == IGT_COLOR_YCBCR_FULL_RANGE) {
t = igt_matrix_translate(0.0f, -128.0f, -128.0f);
s = igt_matrix_scale(1.0f, 2.0f, 2.0f);
} else {
t = igt_matrix_translate(-16.0f, -128.0f, -128.0f);
s = igt_matrix_scale(255.0f / (235.0f - 16.0f),
255.0f / (240.0f - 128.0f),
255.0f / (240.0f - 128.0f));
}
return igt_matrix_multiply(&s, &t);
}
static struct igt_mat4 ycbcr_output_convert_matrix(enum igt_color_range color_range)
{
struct igt_mat4 s, t;
if (color_range == IGT_COLOR_YCBCR_FULL_RANGE) {
s = igt_matrix_scale(1.0f, 0.5f, 0.5f);
t = igt_matrix_translate(0.0f, 128.0f, 128.0f);
} else {
s = igt_matrix_scale((235.0f - 16.0f) / 255.0f,
(240.0f - 128.0f) / 255.0f,
(240.0f - 128.0f) / 255.0f);
t = igt_matrix_translate(16.0f, 128.0f, 128.0f);
}
return igt_matrix_multiply(&t, &s);
}
struct igt_mat4 igt_ycbcr_to_rgb_matrix(enum igt_color_encoding color_encoding,
enum igt_color_range color_range)
{
const struct color_encoding *e = &color_encodings[color_encoding];
struct igt_mat4 r, c;
r = ycbcr_input_convert_matrix(color_range);
c = ycbcr_to_rgb_matrix(e);
return igt_matrix_multiply(&c, &r);
}
struct igt_mat4 igt_rgb_to_ycbcr_matrix(enum igt_color_encoding color_encoding,
enum igt_color_range color_range)
{
const struct color_encoding *e = &color_encodings[color_encoding];
struct igt_mat4 c, r;
c = rgb_to_ycbcr_matrix(e);
r = ycbcr_output_convert_matrix(color_range);
return igt_matrix_multiply(&r, &c);
}
const char *igt_color_encoding_to_str(enum igt_color_encoding encoding)
{
switch (encoding) {
case IGT_COLOR_YCBCR_BT601: return "ITU-R BT.601 YCbCr";
case IGT_COLOR_YCBCR_BT709: return "ITU-R BT.709 YCbCr";
case IGT_COLOR_YCBCR_BT2020: return "ITU-R BT.2020 YCbCr";
default: igt_assert(0); return NULL;
}
}
const char *igt_color_range_to_str(enum igt_color_range range)
{
switch (range) {
case IGT_COLOR_YCBCR_LIMITED_RANGE: return "YCbCr limited range";
case IGT_COLOR_YCBCR_FULL_RANGE: return "YCbCr full range";
default: igt_assert(0); return NULL;
}
}
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