Add exact version of qcms used by Chrome for testing and comparison

third_party/qcms/src/tests/qcms_test_output_trc.c

Index: third_party/qcms/src/tests/qcms_test_output_trc.c
diff --git a/third_party/qcms/src/tests/qcms_test_output_trc.c b/third_party/qcms/src/tests/qcms_test_output_trc.c
new file mode 100644
index 0000000000000000000000000000000000000000..049141b634b089e9fe89e4496870abfe0c20562e
--- /dev/null
+++ b/third_party/qcms/src/tests/qcms_test_output_trc.c
@@ -0,0 +1,255 @@
+// 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
+};