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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the Chromium LICENSE file.
#include "qcms.h"
#include "qcms_test_util.h"
#include <assert.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define PARAMETRIC_CURVE_TYPE 0x70617261 // 'para'
static const float inverse65535 = (float) (1.0 / 65535.0);
extern float clamp_float(float a);
static int get_output_gamma_table(const char *profile_path, uint16_t **table, size_t *size)
{
qcms_transform *transform;
qcms_profile *sRGB;
qcms_profile *target;
target = qcms_profile_from_path(profile_path);
if (!target) {
fprintf(stderr, "Invalid input profile\n");
return EXIT_FAILURE;
}
sRGB = qcms_profile_sRGB();
transform = qcms_transform_create(sRGB, QCMS_DATA_RGBA_8, target, QCMS_DATA_RGBA_8, QCMS_INTENT_DEFAULT);
if (!transform) {
fprintf(stderr, "Failed to create colour transform\n");
qcms_profile_release(sRGB);
qcms_profile_release(target);
return EXIT_FAILURE;
}
*size = qcms_transform_get_output_trc_rgba(transform, target, QCMS_TRC_USHORT, NULL);
assert(*size >= 256);
*table = malloc(*size * sizeof(uint16_t) * 4);
qcms_transform_get_output_trc_rgba(transform, target, QCMS_TRC_USHORT, *table);
qcms_transform_release(transform);
qcms_profile_release(sRGB);
qcms_profile_release(target);
return 0;
}
static int get_input_gamma_table(const char *profile_path, uint16_t **table, size_t *size)
{
qcms_transform *transform;
qcms_profile *source;
qcms_profile *sRGB;
source = qcms_profile_from_path(profile_path);
if (!source) {
fprintf(stderr, "Invalid input profile\n");
return EXIT_FAILURE;
}
sRGB = qcms_profile_sRGB();
transform = qcms_transform_create(source, QCMS_DATA_RGBA_8, sRGB, QCMS_DATA_RGBA_8, QCMS_INTENT_DEFAULT);
if (!transform) {
fprintf(stderr, "Failed to create colour transform\n");
qcms_profile_release(sRGB);
qcms_profile_release(source);
return EXIT_FAILURE;
}
*size = qcms_transform_get_input_trc_rgba(transform, source, QCMS_TRC_USHORT, NULL);
assert(*size >= 256);
*table = calloc(*size, sizeof(uint16_t) * 4);
qcms_transform_get_input_trc_rgba(transform, source, QCMS_TRC_USHORT, *table);
qcms_transform_release(transform);
qcms_profile_release(sRGB);
qcms_profile_release(source);
return 0;
}
static int qcms_test_output_trc(size_t width,
size_t height,
int iterations,
const char *in_path,
const char *out_path,
const int force_software)
{
uint16_t *gamma_table_out = NULL;
size_t output_size = 0;
qcms_profile *profile;
long time_stamp = (long)time(NULL);
char output_file_name[1024];
float scale_factor;
size_t i;
if (!in_path) {
fprintf(stderr, "%s: please provide valid ICC profiles via -i option\n", __FUNCTION__);
return EXIT_FAILURE;
}
printf("Test color profile gamma curves\n");
fflush(stdout);
if (get_output_gamma_table(in_path, &gamma_table_out, &output_size) != 0) {
fprintf(stderr, "Unable to extract output gamma table\n");
return EXIT_FAILURE;
}
printf("Output gamma table size = %zu\n", output_size);
profile = qcms_profile_from_path(in_path);
if (!profile) {
fprintf(stderr, "Invalid input profile\n");
free(gamma_table_out);
return EXIT_FAILURE;
}
if (profile->redTRC->type == PARAMETRIC_CURVE_TYPE) {
// Check the red TRC curve only for now.
int type = - (int)(profile->redTRC->count + 1);
uint16_t *gamma_table_in = NULL;
size_t input_size = 0;
FILE *output_file;
printf("Detected parametric curve type = %d\n", profile->redTRC->count);
if (get_input_gamma_table(in_path, &gamma_table_in, &input_size) != 0) {
fprintf(stderr, "Failed to compute input gamma table\n");
qcms_profile_release(profile);
free(gamma_table_out);
return EXIT_FAILURE;
}
// Write output to stdout and tables into a csv file.
sprintf(output_file_name, "qcms-test-%ld-parametric-gamma-output-%s.csv",
time_stamp, profile->description);
printf("Writing output gamma tables to %s\n", output_file_name);
output_file = fopen(output_file_name, "w");
printf("Parametric gamma values for profile %s description [%s]\n",
in_path, profile->description);
fprintf(output_file, "Parametric gamma values for profile %s description [%s]\n",
in_path, profile->description);
printf("gamma = %.6f, a = %.6f, b = %.6f, c = %.6f, d = %.6f, e = %.6f, f = %.6f\n",
profile->redTRC->parameter[0], profile->redTRC->parameter[1], profile->redTRC->parameter[2],
profile->redTRC->parameter[3], profile->redTRC->parameter[4], profile->redTRC->parameter[5],
profile->redTRC->parameter[6]);
fprintf(output_file, "gamma, a, b, c, d, e, f\n");
fprintf(output_file, "%.6f, %.6f, %.6f, %.6f, %.6f, %.6f, %.6f\n",
profile->redTRC->parameter[0], profile->redTRC->parameter[1], profile->redTRC->parameter[2],
profile->redTRC->parameter[3], profile->redTRC->parameter[4], profile->redTRC->parameter[5],
profile->redTRC->parameter[6]);
fprintf(output_file, "\nInput curve size: %zu", input_size);
fprintf(output_file, "\nOutput curve size: %zu", output_size);
fprintf(output_file, "\n\nInput gamma, Output gamma, LCMS Output gamma, Output gamma error\n");
// Output gamma curve down-sample factor.
scale_factor = (float)(output_size - 1) / (input_size - 1);
for (i = 0; i < input_size; ++i) {
float input = gamma_table_in[i * 4] * inverse65535;
size_t out_index = (size_t)floor(i * scale_factor + 0.5);
float output = gamma_table_out[out_index * 4] * inverse65535;
float x = out_index / (float)(output_size - 1);
float reference = clamp_float(evaluate_parametric_curve(type, profile->redTRC->parameter, x));
float difference = fabs(output - reference);
fprintf(output_file, "%.6f, %.6f, %6f, %6f\n", input, output, reference, difference);
}
fprintf(output_file, "\nNote: the output gamma curves are down-sampled by a factor of %zu / %zu\n",
output_size, input_size);
fclose(output_file);
free(gamma_table_in);
} else {
uint16_t *gamma_table_in = NULL;
size_t input_size = 0;
FILE *output_file;
if (get_input_gamma_table(in_path, &gamma_table_in, &input_size) != 0) {
fprintf(stderr, "Failed to compute input gamma table\n");
qcms_profile_release(profile);
free(gamma_table_out);
return EXIT_FAILURE;
}
// Write output to stdout and tables into a csv file.
sprintf(output_file_name, "qcms-test-%ld-gamma-output-%s.csv",
time_stamp, profile->description);
printf("Writing gamma tables to %s\n", output_file_name);
output_file = fopen(output_file_name, "w");
printf("Gamma values for profile %s description [%s]\n",
in_path, profile->description);
fprintf(output_file, "Gamma values for profile %s description [%s]\n",
in_path, profile->description);
if (profile->redTRC->count == 0) {
printf("Gamma LUT type 0: linear gamma\n");
fprintf(output_file, "Gamma LUT type 0: linear gamma\n");
} else if (profile->redTRC->count == 1) {
float gamma = profile->redTRC->data[0] / 256.0f;
printf("Gamma LUT type 1: gamma = %.6f\n", gamma);
fprintf(output_file, "Gamma LUT type 1: gamma = %.6f\n", gamma);
} else {
printf("Gamma LUT table size = %u\n", profile->redTRC->count);
fprintf(output_file, "Gamma LUT table size = %u\n", profile->redTRC->count);
}
fprintf(output_file, "\nInput curve size: %zu", input_size);
fprintf(output_file, "\nOutput curve size: %zu", output_size);
fprintf(output_file, "\n\nInput gamma, Output gamma\n");
// Output gamma curve down-sample factor.
scale_factor = (float)(output_size - 1) / (input_size - 1);
for (i = 0; i < input_size; ++i) {
float input = gamma_table_in[i * 4] * inverse65535;
size_t out_index = (size_t)floor(i * scale_factor + 0.5);
float output = gamma_table_out[out_index * 4] * inverse65535;
fprintf(output_file, "%.6f, %.6f\n", input, output);
}
fprintf(output_file, "\nNote: the output gamma curves are down-sampled by a factor of %zu / %zu\n",
output_size, input_size);
fclose(output_file);
free(gamma_table_in);
}
qcms_profile_release(profile);
free(gamma_table_out);
return 0;
}
struct qcms_test_case qcms_test_output_trc_info = {
"qcms_test_output_trc",
qcms_test_output_trc,
QCMS_TEST_DISABLED
};
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