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weston/tests/color_util.c
Pekka Paalanen 3f60542405 tests/color_util: make rgb_diff_stat pos explicit 
The recently introduced rgb_diff_stat value dumping feature logs the
"position" where the value or error was measured. The reference value
was used as the position, but the problem with the reference value is
that it is an output value and not an input value. Therefore mapping
that back to which input values promoted the error is not easy.

Fix that problem by passing the position explicitly into
rgb_diff_stat_update(), just like it is already passed in to
scalar_stat_update().

Currently the only user simply passes the reference value as position,
because there the input value is also the reference value. This is not
true for future uses of rgb_diff_stat.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
2022-06-30 09:08:32 +00:00

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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.
*/
#include "config.h"
#include <math.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <stddef.h>
#include <libweston/matrix.h>
#include "color_util.h"
#include "weston-test-runner.h"
#include "shared/helpers.h"
static_assert(sizeof(struct color_float) == 4 * sizeof(float),
"unexpected padding in struct color_float");
static_assert(offsetof(struct color_float, r) == offsetof(struct color_float, rgb[COLOR_CHAN_R]),
"unexpected offset for struct color_float::r");
static_assert(offsetof(struct color_float, g) == offsetof(struct color_float, rgb[COLOR_CHAN_G]),
"unexpected offset for struct color_float::g");
static_assert(offsetof(struct color_float, b) == offsetof(struct color_float, rgb[COLOR_CHAN_B]),
"unexpected offset for struct color_float::b");
struct color_tone_curve {
enum transfer_fn fn;
enum transfer_fn inv_fn;
/* LCMS2 API */
int internal_type;
double param[5];
};
/* Mapping from enum transfer_fn to LittleCMS curve parameters. */
const struct color_tone_curve arr_curves[] = {
{
.fn = TRANSFER_FN_SRGB_EOTF,
.inv_fn = TRANSFER_FN_SRGB_EOTF_INVERSE,
.internal_type = 4,
.param = { 2.4, 1. / 1.055, 0.055 / 1.055, 1. / 12.92, 0.04045 },
},
{
.fn = TRANSFER_FN_ADOBE_RGB_EOTF,
.inv_fn = TRANSFER_FN_ADOBE_RGB_EOTF_INVERSE,
.internal_type = 1,
.param = { 563./256., 0.0, 0.0, 0.0 , 0.0 },
},
{
.fn = TRANSFER_FN_POWER2_4_EOTF,
.inv_fn = TRANSFER_FN_POWER2_4_EOTF_INVERSE,
.internal_type = 1,
.param = { 2.4, 0.0, 0.0, 0.0 , 0.0 },
}
};
bool
find_tone_curve_type(enum transfer_fn fn, int *type, double params[5])
{
const int size_arr = ARRAY_LENGTH(arr_curves);
const struct color_tone_curve *curve;
for (curve = &arr_curves[0]; curve < &arr_curves[size_arr]; curve++ ) {
if (curve->fn == fn )
*type = curve->internal_type;
else if (curve->inv_fn == fn)
*type = -curve->internal_type;
else
continue;
memcpy(params, curve->param, sizeof(curve->param));
return true;
}
return false;
}
enum transfer_fn
transfer_fn_invert(enum transfer_fn fn)
{
switch (fn) {
case TRANSFER_FN_ADOBE_RGB_EOTF:
return TRANSFER_FN_ADOBE_RGB_EOTF_INVERSE;
case TRANSFER_FN_ADOBE_RGB_EOTF_INVERSE:
return TRANSFER_FN_ADOBE_RGB_EOTF;
case TRANSFER_FN_IDENTITY:
return TRANSFER_FN_IDENTITY;
case TRANSFER_FN_POWER2_4_EOTF:
return TRANSFER_FN_POWER2_4_EOTF_INVERSE;
case TRANSFER_FN_POWER2_4_EOTF_INVERSE:
return TRANSFER_FN_POWER2_4_EOTF;
case TRANSFER_FN_SRGB_EOTF:
return TRANSFER_FN_SRGB_EOTF_INVERSE;
case TRANSFER_FN_SRGB_EOTF_INVERSE:
return TRANSFER_FN_SRGB_EOTF;
}
assert(0 && "bad transfer_fn");
return 0;
}
const char *
transfer_fn_name(enum transfer_fn fn)
{
switch (fn) {
case TRANSFER_FN_ADOBE_RGB_EOTF:
return "AdobeRGB EOTF";
case TRANSFER_FN_ADOBE_RGB_EOTF_INVERSE:
return "inverse AdobeRGB EOTF";
case TRANSFER_FN_IDENTITY:
return "identity";
case TRANSFER_FN_POWER2_4_EOTF:
return "power 2.4";
case TRANSFER_FN_POWER2_4_EOTF_INVERSE:
return "inverse power 2.4";
case TRANSFER_FN_SRGB_EOTF:
return "sRGB EOTF";
case TRANSFER_FN_SRGB_EOTF_INVERSE:
return "inverse sRGB EOTF";
}
assert(0 && "bad transfer_fn");
return 0;
}
/**
* NaN comes out as is
*This function is not intended for hiding NaN.
*/
static float
ensure_unit_range(float v)
{
const float tol = 1e-5f;
const float lim_lo = -tol;
const float lim_hi = 1.0f + tol;
assert(v >= lim_lo);
if (v < 0.0f)
return 0.0f;
assert(v <= lim_hi);
if (v > 1.0f)
return 1.0f;
return v;
}
static float
sRGB_EOTF(float e)
{
e = ensure_unit_range(e);
if (e <= 0.04045)
return e / 12.92;
else
return pow((e + 0.055) / 1.055, 2.4);
}
static float
sRGB_EOTF_inv(float o)
{
o = ensure_unit_range(o);
if (o <= 0.04045 / 12.92)
return o * 12.92;
else
return pow(o, 1.0 / 2.4) * 1.055 - 0.055;
}
static float
AdobeRGB_EOTF(float e)
{
e = ensure_unit_range(e);
return pow(e, 563./256.);
}
static float
AdobeRGB_EOTF_inv(float o)
{
o = ensure_unit_range(o);
return pow(o, 256./563.);
}
static float
Power2_4_EOTF(float e)
{
e = ensure_unit_range(e);
return pow(e, 2.4);
}
static float
Power2_4_EOTF_inv(float o)
{
o = ensure_unit_range(o);
return pow(o, 1./2.4);
}
float
apply_tone_curve(enum transfer_fn fn, float r)
{
float ret = 0;
switch(fn) {
case TRANSFER_FN_IDENTITY:
ret = r;
break;
case TRANSFER_FN_SRGB_EOTF:
ret = sRGB_EOTF(r);
break;
case TRANSFER_FN_SRGB_EOTF_INVERSE:
ret = sRGB_EOTF_inv(r);
break;
case TRANSFER_FN_ADOBE_RGB_EOTF:
ret = AdobeRGB_EOTF(r);
break;
case TRANSFER_FN_ADOBE_RGB_EOTF_INVERSE:
ret = AdobeRGB_EOTF_inv(r);
break;
case TRANSFER_FN_POWER2_4_EOTF:
ret = Power2_4_EOTF(r);
break;
case TRANSFER_FN_POWER2_4_EOTF_INVERSE:
ret = Power2_4_EOTF_inv(r);
break;
}
return ret;
}
struct color_float
a8r8g8b8_to_float(uint32_t v)
{
struct color_float cf;
cf.a = ((v >> 24) & 0xff) / 255.f;
cf.r = ((v >> 16) & 0xff) / 255.f;
cf.g = ((v >> 8) & 0xff) / 255.f;
cf.b = ((v >> 0) & 0xff) / 255.f;
return cf;
}
static struct color_float
color_float_apply_curve(enum transfer_fn fn, struct color_float c)
{
unsigned i;
for (i = 0; i < COLOR_CHAN_NUM; i++)
c.rgb[i] = apply_tone_curve(fn, c.rgb[i]);
return c;
}
void
sRGB_linearize(struct color_float *cf)
{
*cf = color_float_apply_curve(TRANSFER_FN_SRGB_EOTF, *cf);
}
void
sRGB_delinearize(struct color_float *cf)
{
*cf = color_float_apply_curve(TRANSFER_FN_SRGB_EOTF_INVERSE, *cf);
}
struct color_float
color_float_unpremult(struct color_float in)
{
static const struct color_float transparent = {
.r = 0.0f, .g = 0.0f, .b = 0.0f, .a = 0.0f,
};
struct color_float out;
int i;
if (in.a == 0.0f)
return transparent;
for (i = 0; i < COLOR_CHAN_NUM; i++)
out.rgb[i] = in.rgb[i] / in.a;
out.a = in.a;
return out;
}
/*
* Returns the result of the matrix-vector multiplication mat * c.
*/
struct color_float
color_float_apply_matrix(const struct lcmsMAT3 *mat, struct color_float c)
{
struct color_float result;
unsigned i, j;
/*
* The matrix has an array of columns, hence i indexes to rows and
* j indexes to columns.
*/
for (i = 0; i < 3; i++) {
result.rgb[i] = 0.0f;
for (j = 0; j < 3; j++)
result.rgb[i] += mat->v[j].n[i] * c.rgb[j];
}
result.a = c.a;
return result;
}
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 cf;
cf = color_float_apply_curve(pre_curve, *in);
cf = color_float_apply_matrix(mat, cf);
*out = color_float_apply_curve(post_curve, cf);
}
static void
weston_matrix_from_lcmsMAT3(struct weston_matrix *w, const struct lcmsMAT3 *m)
{
unsigned r, c;
/* column-major */
weston_matrix_init(w);
for (c = 0; c < 3; c++) {
for (r = 0; r < 3; r++)
w->d[c * 4 + r] = m->v[c].n[r];
}
}
static void
lcmsMAT3_from_weston_matrix(struct lcmsMAT3 *m, const struct weston_matrix *w)
{
unsigned r, c;
for (c = 0; c < 3; c++) {
for (r = 0; r < 3; r++)
m->v[c].n[r] = w->d[c * 4 + r];
}
}
void
lcmsMAT3_invert(struct lcmsMAT3 *result, const struct lcmsMAT3 *mat)
{
struct weston_matrix inv;
struct weston_matrix w;
int ret;
weston_matrix_from_lcmsMAT3(&w, mat);
ret = weston_matrix_invert(&inv, &w);
assert(ret == 0);
lcmsMAT3_from_weston_matrix(result, &inv);
}
void
scalar_stat_update(struct scalar_stat *stat,
double val,
const struct color_float *pos)
{
if (stat->count == 0 || stat->min > val) {
stat->min = val;
stat->min_pos = *pos;
}
if (stat->count == 0 || stat->max < val) {
stat->max = val;
stat->max_pos = *pos;
}
stat->sum += val;
stat->count++;
if (stat->dump) {
fprintf(stat->dump, "%.8g %.5g %.5g %.5g %.5g\n",
val, pos->r, pos->g, pos->b, pos->a);
}
}
float
scalar_stat_avg(const struct scalar_stat *stat)
{
return stat->sum / stat->count;
}
void
scalar_stat_print_float(const struct scalar_stat *stat)
{
testlog(" min %11.5g at %.5f\n", stat->min, stat->min_pos.r);
testlog(" max %11.5g at %.5f\n", stat->max, stat->max_pos.r);
testlog(" avg %11.5g\n", scalar_stat_avg(stat));
}
static void
print_stat_at_pos(const char *lim, double val, struct color_float pos, double scale)
{
testlog(" %s %8.5f at rgb(%7.2f, %7.2f, %7.2f)\n",
lim, val * scale, pos.r * scale, pos.g * scale, pos.b * scale);
}
static void
print_rgb_at_pos(const struct scalar_stat *stat, double scale)
{
print_stat_at_pos("min", stat->min, stat->min_pos, scale);
print_stat_at_pos("max", stat->max, stat->max_pos, scale);
testlog(" avg %8.5f\n", scalar_stat_avg(stat) * scale);
}
void
rgb_diff_stat_print(const struct rgb_diff_stat *stat,
const char *title, unsigned scaling_bits)
{
const char *const chan_name[COLOR_CHAN_NUM] = { "r", "g", "b" };
float scale = exp2f(scaling_bits) - 1.0f;
unsigned i;
assert(scaling_bits > 0);
testlog("%s error statistics, %u samples, value range 0.0 - %.1f:\n",
title, stat->two_norm.count, scale);
for (i = 0; i < COLOR_CHAN_NUM; i++) {
testlog(" ch %s (signed):\n", chan_name[i]);
print_rgb_at_pos(&stat->rgb[i], scale);
}
testlog(" rgb two-norm:\n");
print_rgb_at_pos(&stat->two_norm, scale);
}
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)
{
unsigned i;
double ssd = 0.0;
for (i = 0; i < COLOR_CHAN_NUM; i++) {
double diff = val->rgb[i] - ref->rgb[i];
scalar_stat_update(&stat->rgb[i], diff, pos);
ssd += diff * diff;
}
scalar_stat_update(&stat->two_norm, sqrt(ssd), pos);
}
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