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// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include <stdio.h>
#include <stdlib.h>
#include "lib/extras/codec.h"
#include "lib/jxl/base/thread_pool_internal.h"
#include "tools/args.h"
#include "tools/cmdline.h"
int main(int argc, const char** argv) {
jxl::ThreadPoolInternal pool;
jpegxl::tools::CommandLineParser parser;
const char* input_filename = nullptr;
auto input_filename_option = parser.AddPositionalOption(
"input", true, "input image", &input_filename, 0);
const char* output_filename = nullptr;
auto output_filename_option = parser.AddPositionalOption(
"output", true, "output Cube LUT", &output_filename, 0);
if (!parser.Parse(argc, argv)) {
fprintf(stderr, "See -h for help.\n");
return EXIT_FAILURE;
}
if (parser.HelpFlagPassed()) {
parser.PrintHelp();
return EXIT_SUCCESS;
}
if (!parser.GetOption(input_filename_option)->matched()) {
fprintf(stderr, "Missing input filename.\nSee -h for help.\n");
return EXIT_FAILURE;
}
if (!parser.GetOption(output_filename_option)->matched()) {
fprintf(stderr, "Missing output filename.\nSee -h for help.\n");
return EXIT_FAILURE;
}
jxl::CodecInOut image;
JXL_CHECK(jxl::SetFromFile(input_filename, jxl::extras::ColorHints(), &image,
&pool));
JXL_CHECK(image.xsize() == image.ysize() * image.ysize());
const unsigned N = image.ysize();
FILE* const output = fopen(output_filename, "wb");
JXL_CHECK(output);
fprintf(output, "# Created by libjxl\n");
fprintf(output, "LUT_3D_SIZE %u\n", N);
fprintf(output, "DOMAIN_MIN 0.0 0.0 0.0\nDOMAIN_MAX 1.0 1.0 1.0\n\n");
for (size_t b = 0; b < N; ++b) {
for (size_t g = 0; g < N; ++g) {
const size_t y = g;
const float* const JXL_RESTRICT rows[3] = {
image.Main().color()->ConstPlaneRow(0, y) + N * b,
image.Main().color()->ConstPlaneRow(1, y) + N * b,
image.Main().color()->ConstPlaneRow(2, y) + N * b};
for (size_t r = 0; r < N; ++r) {
const size_t x = r;
fprintf(output, "%.6f %.6f %.6f\n", rows[0][x], rows[1][x], rows[2][x]);
}
}
}
}
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