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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.
+
+// This example encodes a file containing a floating point image to another
+// file containing JPEG XL image with a single frame.
+
+#include <jxl/encode.h>
+#include <jxl/encode_cxx.h>
+#include <jxl/thread_parallel_runner.h>
+#include <jxl/thread_parallel_runner_cxx.h>
+#include <limits.h>
+#include <string.h>
+
+#include <sstream>
+#include <string>
+#include <vector>
+
+/**
+ * Reads from .pfm file (Portable FloatMap)
+ *
+ * @param filename name of the file to read
+ * @param pixels vector to fill with loaded pixels as 32-bit floating point with
+ * 3-channel RGB
+ * @param xsize set to width of loaded image
+ * @param ysize set to height of loaded image
+ */
+bool ReadPFM(const char* filename, std::vector<float>* pixels, uint32_t* xsize,
+ uint32_t* ysize) {
+ FILE* file = fopen(filename, "rb");
+ if (!file) {
+ fprintf(stderr, "Could not open %s for reading.\n", filename);
+ return false;
+ }
+ uint32_t endian_test = 1;
+ uint8_t little_endian[4];
+ memcpy(little_endian, &endian_test, 4);
+
+ if (fseek(file, 0, SEEK_END) != 0) {
+ fclose(file);
+ return false;
+ }
+
+ long size = ftell(file);
+ // Avoid invalid file or directory.
+ if (size >= LONG_MAX || size < 0) {
+ fclose(file);
+ return false;
+ }
+
+ if (fseek(file, 0, SEEK_SET) != 0) {
+ fclose(file);
+ return false;
+ }
+
+ std::vector<char> data;
+ data.resize(size);
+
+ size_t readsize = fread(data.data(), 1, size, file);
+ if ((long)readsize != size) {
+ return false;
+ }
+ if (fclose(file) != 0) {
+ return false;
+ }
+
+ std::stringstream datastream;
+ std::string datastream_content(data.data(), data.size());
+ datastream.str(datastream_content);
+
+ std::string pf_token;
+ getline(datastream, pf_token, '\n');
+ if (pf_token != "PF") {
+ fprintf(stderr,
+ "%s doesn't seem to be a 3 channel Portable FloatMap file (missing "
+ "'PF\\n' "
+ "bytes).\n",
+ filename);
+ return false;
+ }
+
+ std::string xsize_token;
+ getline(datastream, xsize_token, ' ');
+ *xsize = std::stoi(xsize_token);
+
+ std::string ysize_token;
+ getline(datastream, ysize_token, '\n');
+ *ysize = std::stoi(ysize_token);
+
+ std::string endianness_token;
+ getline(datastream, endianness_token, '\n');
+ bool input_little_endian;
+ if (endianness_token == "1.0") {
+ input_little_endian = false;
+ } else if (endianness_token == "-1.0") {
+ input_little_endian = true;
+ } else {
+ fprintf(stderr,
+ "%s doesn't seem to be a Portable FloatMap file (endianness token "
+ "isn't '1.0' or '-1.0').\n",
+ filename);
+ return false;
+ }
+
+ size_t offset = pf_token.size() + 1 + xsize_token.size() + 1 +
+ ysize_token.size() + 1 + endianness_token.size() + 1;
+
+ if (data.size() != *ysize * *xsize * 3 * 4 + offset) {
+ fprintf(stderr,
+ "%s doesn't seem to be a Portable FloatMap file (pixel data bytes "
+ "are %d, but expected %d * %d * 3 * 4 + %d (%d).\n",
+ filename, (int)data.size(), (int)*ysize, (int)*xsize, (int)offset,
+ (int)(*ysize * *xsize * 3 * 4 + offset));
+ return false;
+ }
+
+ if (!!little_endian[0] != input_little_endian) {
+ fprintf(stderr,
+ "%s has a different endianness than we do, conversion is not "
+ "supported.\n",
+ filename);
+ return false;
+ }
+
+ pixels->resize(*ysize * *xsize * 3);
+
+ for (int y = *ysize - 1; y >= 0; y--) {
+ for (int x = 0; x < (int)*xsize; x++) {
+ for (int c = 0; c < 3; c++) {
+ memcpy(pixels->data() + (y * *xsize + x) * 3 + c, data.data() + offset,
+ sizeof(float));
+ offset += sizeof(float);
+ }
+ }
+ }
+
+ return true;
+}
+
+/**
+ * Compresses the provided pixels.
+ *
+ * @param pixels input pixels
+ * @param xsize width of the input image
+ * @param ysize height of the input image
+ * @param compressed will be populated with the compressed bytes
+ */
+bool EncodeJxlOneshot(const std::vector<float>& pixels, const uint32_t xsize,
+ const uint32_t ysize, std::vector<uint8_t>* compressed) {
+ auto enc = JxlEncoderMake(/*memory_manager=*/nullptr);
+ auto runner = JxlThreadParallelRunnerMake(
+ /*memory_manager=*/nullptr,
+ JxlThreadParallelRunnerDefaultNumWorkerThreads());
+ if (JXL_ENC_SUCCESS != JxlEncoderSetParallelRunner(enc.get(),
+ JxlThreadParallelRunner,
+ runner.get())) {
+ fprintf(stderr, "JxlEncoderSetParallelRunner failed\n");
+ return false;
+ }
+
+ JxlPixelFormat pixel_format = {3, JXL_TYPE_FLOAT, JXL_NATIVE_ENDIAN, 0};
+
+ JxlBasicInfo basic_info;
+ JxlEncoderInitBasicInfo(&basic_info);
+ basic_info.xsize = xsize;
+ basic_info.ysize = ysize;
+ basic_info.bits_per_sample = 32;
+ basic_info.exponent_bits_per_sample = 8;
+ basic_info.uses_original_profile = JXL_FALSE;
+ if (JXL_ENC_SUCCESS != JxlEncoderSetBasicInfo(enc.get(), &basic_info)) {
+ fprintf(stderr, "JxlEncoderSetBasicInfo failed\n");
+ return false;
+ }
+
+ JxlColorEncoding color_encoding = {};
+ JxlColorEncodingSetToSRGB(&color_encoding,
+ /*is_gray=*/pixel_format.num_channels < 3);
+ if (JXL_ENC_SUCCESS !=
+ JxlEncoderSetColorEncoding(enc.get(), &color_encoding)) {
+ fprintf(stderr, "JxlEncoderSetColorEncoding failed\n");
+ return false;
+ }
+
+ JxlEncoderFrameSettings* frame_settings =
+ JxlEncoderFrameSettingsCreate(enc.get(), nullptr);
+
+ if (JXL_ENC_SUCCESS !=
+ JxlEncoderAddImageFrame(frame_settings, &pixel_format,
+ (void*)pixels.data(),
+ sizeof(float) * pixels.size())) {
+ fprintf(stderr, "JxlEncoderAddImageFrame failed\n");
+ return false;
+ }
+ JxlEncoderCloseInput(enc.get());
+
+ compressed->resize(64);
+ uint8_t* next_out = compressed->data();
+ size_t avail_out = compressed->size() - (next_out - compressed->data());
+ JxlEncoderStatus process_result = JXL_ENC_NEED_MORE_OUTPUT;
+ while (process_result == JXL_ENC_NEED_MORE_OUTPUT) {
+ process_result = JxlEncoderProcessOutput(enc.get(), &next_out, &avail_out);
+ if (process_result == JXL_ENC_NEED_MORE_OUTPUT) {
+ size_t offset = next_out - compressed->data();
+ compressed->resize(compressed->size() * 2);
+ next_out = compressed->data() + offset;
+ avail_out = compressed->size() - offset;
+ }
+ }
+ compressed->resize(next_out - compressed->data());
+ if (JXL_ENC_SUCCESS != process_result) {
+ fprintf(stderr, "JxlEncoderProcessOutput failed\n");
+ return false;
+ }
+
+ return true;
+}
+
+/**
+ * Writes bytes to file.
+ */
+bool WriteFile(const std::vector<uint8_t>& bytes, const char* filename) {
+ FILE* file = fopen(filename, "wb");
+ if (!file) {
+ fprintf(stderr, "Could not open %s for writing\n", filename);
+ return false;
+ }
+ if (fwrite(bytes.data(), sizeof(uint8_t), bytes.size(), file) !=
+ bytes.size()) {
+ fprintf(stderr, "Could not write bytes to %s\n", filename);
+ fclose(file);
+ return false;
+ }
+ if (fclose(file) != 0) {
+ fprintf(stderr, "Could not close %s\n", filename);
+ return false;
+ }
+ return true;
+}
+
+int main(int argc, char* argv[]) {
+ if (argc != 3) {
+ fprintf(stderr,
+ "Usage: %s <pfm> <jxl>\n"
+ "Where:\n"
+ " pfm = input Portable FloatMap image filename\n"
+ " jxl = output JPEG XL image filename\n"
+ "Output files will be overwritten.\n",
+ argv[0]);
+ return 1;
+ }
+
+ const char* pfm_filename = argv[1];
+ const char* jxl_filename = argv[2];
+
+ std::vector<float> pixels;
+ uint32_t xsize;
+ uint32_t ysize;
+ if (!ReadPFM(pfm_filename, &pixels, &xsize, &ysize)) {
+ fprintf(stderr, "Couldn't load %s\n", pfm_filename);
+ return 2;
+ }
+
+ std::vector<uint8_t> compressed;
+ if (!EncodeJxlOneshot(pixels, xsize, ysize, &compressed)) {
+ fprintf(stderr, "Couldn't encode jxl\n");
+ return 3;
+ }
+
+ if (!WriteFile(compressed, jxl_filename)) {
+ fprintf(stderr, "Couldn't write jxl file\n");
+ return 4;
+ }
+
+ return 0;
+}
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