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/*
* Copyright 2020 Collabora, Ltd.
* Copyright 2021 Advanced Micro Devices, Inc.
*
* 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.
*/
#pragma once
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
enum color_chan_index {
COLOR_CHAN_R = 0,
COLOR_CHAN_G,
COLOR_CHAN_B,
COLOR_CHAN_NUM
};
/* column vector when used in linear algebra */
struct color_float {
union {
float rgb[COLOR_CHAN_NUM];
struct {
float r, g, b;
};
};
float a;
};
/* column vector */
struct lcmsVEC3 {
float n[3];
};
struct lcmsMAT3 {
/* array of columns */
struct lcmsVEC3 v[3];
};
enum transfer_fn {
TRANSFER_FN_IDENTITY,
TRANSFER_FN_SRGB_EOTF,
TRANSFER_FN_SRGB_EOTF_INVERSE,
TRANSFER_FN_ADOBE_RGB_EOTF,
TRANSFER_FN_ADOBE_RGB_EOTF_INVERSE,
TRANSFER_FN_POWER2_4_EOTF,
TRANSFER_FN_POWER2_4_EOTF_INVERSE,
};
/*
* A helper to lay out a matrix in the natural writing order in code
* instead of needing to transpose in your mind every time you read it.
* The matrix is laid out as written:
* ⎡ a11 a12 a13 ⎤
* ⎢ a21 a22 a23 ⎥
* ⎣ a31 a32 a33 ⎦
* where the first digit is row and the second digit is column.
*/
#define LCMSMAT3(a11, a12, a13, \
a21, a22, a23, \
a31, a32, a33) ((struct lcmsMAT3) \
{ /* Each vector is a column => looks like a transpose */ \
.v[0] = { .n = { a11, a21, a31} }, \
.v[1] = { .n = { a12, a22, a32} }, \
.v[2] = { .n = { a13, a23, a33} }, \
})
void
sRGB_linearize(struct color_float *cf);
void
sRGB_delinearize(struct color_float *cf);
struct color_float
a8r8g8b8_to_float(uint32_t v);
bool
find_tone_curve_type(enum transfer_fn fn, int *type, double params[5]);
float
apply_tone_curve(enum transfer_fn fn, float r);
void
process_pixel_using_pipeline(enum transfer_fn pre_curve,
const struct lcmsMAT3 *mat,
enum transfer_fn post_curve,
const struct color_float *in,
struct color_float *out);
struct color_float
color_float_unpremult(struct color_float in);
struct color_float
color_float_apply_curve(enum transfer_fn fn, struct color_float c);
struct color_float
color_float_apply_matrix(const struct lcmsMAT3 *mat, struct color_float c);
enum transfer_fn
transfer_fn_invert(enum transfer_fn fn);
const char *
transfer_fn_name(enum transfer_fn fn);
void
lcmsMAT3_invert(struct lcmsMAT3 *result, const struct lcmsMAT3 *mat);
/** Scalar statistics
*
* See scalar_stat_update().
*/
struct scalar_stat {
double min;
struct color_float min_pos;
double max;
struct color_float max_pos;
double sum;
unsigned count;
/** Debug dump into file
*
* Initialize this to a writable file to get a record of all values
* ever fed through this statistics accumulator. The file shall be
* text with one value and its position per line:
* val pos.r pos.g pos.b pos.a
*
* Set to NULL to not record.
*/
FILE *dump;
};
/** RGB difference statistics
*
* See rgb_diff_stat_update().
*/
struct rgb_diff_stat {
struct scalar_stat rgb[COLOR_CHAN_NUM];
struct scalar_stat two_norm;
/** Debug dump into file
*
* Initialize this to a writable file to get a record of all values
* ever fed through this statistics accumulator. The file shall be
* text with the two-norm error, the rgb difference, and their position
* per line:
* norm diff.r diff.g diff.b pos.r pos.g pos.b pos.a
*
* Set to NULL to not record.
*/
FILE *dump;
};
void
scalar_stat_update(struct scalar_stat *stat,
double val,
const struct color_float *pos);
float
scalar_stat_avg(const struct scalar_stat *stat);
void
scalar_stat_print_float(const struct scalar_stat *stat);
void
rgb_diff_stat_update(struct rgb_diff_stat *stat,
const struct color_float *ref,
const struct color_float *val,
const struct color_float *pos);
void
rgb_diff_stat_print(const struct rgb_diff_stat *stat,
const char *title, unsigned scaling_bits);
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