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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 C++ example decodes a JPEG XL image in one shot (all input bytes
+// available at once). The example outputs the pixels and color information to a
+// floating point image and an ICC profile on disk.
+
+#ifndef __STDC_FORMAT_MACROS
+#define __STDC_FORMAT_MACROS
+#endif
+
+#include <inttypes.h>
+#include <jxl/decode.h>
+#include <jxl/decode_cxx.h>
+#include <jxl/resizable_parallel_runner.h>
+#include <jxl/resizable_parallel_runner_cxx.h>
+#include <limits.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <vector>
+
+/** Decodes JPEG XL image to floating point pixels and ICC Profile. Pixel are
+ * stored as floating point, as interleaved RGBA (4 floating point values per
+ * pixel), line per line from top to bottom. Pixel values have nominal range
+ * 0..1 but may go beyond this range for HDR or wide gamut. The ICC profile
+ * describes the color format of the pixel data.
+ */
+bool DecodeJpegXlOneShot(const uint8_t* jxl, size_t size,
+ std::vector<float>* pixels, size_t* xsize,
+ size_t* ysize, std::vector<uint8_t>* icc_profile) {
+ // Multi-threaded parallel runner.
+ auto runner = JxlResizableParallelRunnerMake(nullptr);
+
+ auto dec = JxlDecoderMake(nullptr);
+ if (JXL_DEC_SUCCESS !=
+ JxlDecoderSubscribeEvents(dec.get(), JXL_DEC_BASIC_INFO |
+ JXL_DEC_COLOR_ENCODING |
+ JXL_DEC_FULL_IMAGE)) {
+ fprintf(stderr, "JxlDecoderSubscribeEvents failed\n");
+ return false;
+ }
+
+ if (JXL_DEC_SUCCESS != JxlDecoderSetParallelRunner(dec.get(),
+ JxlResizableParallelRunner,
+ runner.get())) {
+ fprintf(stderr, "JxlDecoderSetParallelRunner failed\n");
+ return false;
+ }
+
+ JxlBasicInfo info;
+ JxlPixelFormat format = {4, JXL_TYPE_FLOAT, JXL_NATIVE_ENDIAN, 0};
+
+ JxlDecoderSetInput(dec.get(), jxl, size);
+ JxlDecoderCloseInput(dec.get());
+
+ for (;;) {
+ JxlDecoderStatus status = JxlDecoderProcessInput(dec.get());
+
+ if (status == JXL_DEC_ERROR) {
+ fprintf(stderr, "Decoder error\n");
+ return false;
+ } else if (status == JXL_DEC_NEED_MORE_INPUT) {
+ fprintf(stderr, "Error, already provided all input\n");
+ return false;
+ } else if (status == JXL_DEC_BASIC_INFO) {
+ if (JXL_DEC_SUCCESS != JxlDecoderGetBasicInfo(dec.get(), &info)) {
+ fprintf(stderr, "JxlDecoderGetBasicInfo failed\n");
+ return false;
+ }
+ *xsize = info.xsize;
+ *ysize = info.ysize;
+ JxlResizableParallelRunnerSetThreads(
+ runner.get(),
+ JxlResizableParallelRunnerSuggestThreads(info.xsize, info.ysize));
+ } else if (status == JXL_DEC_COLOR_ENCODING) {
+ // Get the ICC color profile of the pixel data
+ size_t icc_size;
+ if (JXL_DEC_SUCCESS !=
+ JxlDecoderGetICCProfileSize(
+ dec.get(), &format, JXL_COLOR_PROFILE_TARGET_DATA, &icc_size)) {
+ fprintf(stderr, "JxlDecoderGetICCProfileSize failed\n");
+ return false;
+ }
+ icc_profile->resize(icc_size);
+ if (JXL_DEC_SUCCESS != JxlDecoderGetColorAsICCProfile(
+ dec.get(), &format,
+ JXL_COLOR_PROFILE_TARGET_DATA,
+ icc_profile->data(), icc_profile->size())) {
+ fprintf(stderr, "JxlDecoderGetColorAsICCProfile failed\n");
+ return false;
+ }
+ } else if (status == JXL_DEC_NEED_IMAGE_OUT_BUFFER) {
+ size_t buffer_size;
+ if (JXL_DEC_SUCCESS !=
+ JxlDecoderImageOutBufferSize(dec.get(), &format, &buffer_size)) {
+ fprintf(stderr, "JxlDecoderImageOutBufferSize failed\n");
+ return false;
+ }
+ if (buffer_size != *xsize * *ysize * 16) {
+ fprintf(stderr, "Invalid out buffer size %" PRIu64 " %" PRIu64 "\n",
+ static_cast<uint64_t>(buffer_size),
+ static_cast<uint64_t>(*xsize * *ysize * 16));
+ return false;
+ }
+ pixels->resize(*xsize * *ysize * 4);
+ void* pixels_buffer = (void*)pixels->data();
+ size_t pixels_buffer_size = pixels->size() * sizeof(float);
+ if (JXL_DEC_SUCCESS != JxlDecoderSetImageOutBuffer(dec.get(), &format,
+ pixels_buffer,
+ pixels_buffer_size)) {
+ fprintf(stderr, "JxlDecoderSetImageOutBuffer failed\n");
+ return false;
+ }
+ } else if (status == JXL_DEC_FULL_IMAGE) {
+ // Nothing to do. Do not yet return. If the image is an animation, more
+ // full frames may be decoded. This example only keeps the last one.
+ } else if (status == JXL_DEC_SUCCESS) {
+ // All decoding successfully finished.
+ // It's not required to call JxlDecoderReleaseInput(dec.get()) here since
+ // the decoder will be destroyed.
+ return true;
+ } else {
+ fprintf(stderr, "Unknown decoder status\n");
+ return false;
+ }
+ }
+}
+
+/** Writes to .pfm file (Portable FloatMap). Gimp, tev viewer and ImageMagick
+ * support viewing this format.
+ * The input pixels are given as 32-bit floating point with 4-channel RGBA.
+ * The alpha channel will not be written since .pfm does not support it.
+ */
+bool WritePFM(const char* filename, const float* pixels, size_t xsize,
+ size_t ysize) {
+ FILE* file = fopen(filename, "wb");
+ if (!file) {
+ fprintf(stderr, "Could not open %s for writing", filename);
+ return false;
+ }
+ uint32_t endian_test = 1;
+ uint8_t little_endian[4];
+ memcpy(little_endian, &endian_test, 4);
+
+ fprintf(file, "PF\n%d %d\n%s\n", (int)xsize, (int)ysize,
+ little_endian[0] ? "-1.0" : "1.0");
+ for (int y = ysize - 1; y >= 0; y--) {
+ for (size_t x = 0; x < xsize; x++) {
+ for (size_t c = 0; c < 3; c++) {
+ const float* f = &pixels[(y * xsize + x) * 4 + c];
+ fwrite(f, 4, 1, file);
+ }
+ }
+ }
+ if (fclose(file) != 0) {
+ return false;
+ }
+ return true;
+}
+
+bool LoadFile(const char* filename, std::vector<uint8_t>* out) {
+ FILE* file = fopen(filename, "rb");
+ if (!file) {
+ return false;
+ }
+
+ 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;
+ }
+
+ out->resize(size);
+ size_t readsize = fread(out->data(), 1, size, file);
+ if (fclose(file) != 0) {
+ return false;
+ }
+
+ return readsize == static_cast<size_t>(size);
+}
+
+bool WriteFile(const char* filename, const uint8_t* data, size_t size) {
+ FILE* file = fopen(filename, "wb");
+ if (!file) {
+ fprintf(stderr, "Could not open %s for writing", filename);
+ return false;
+ }
+ fwrite(data, 1, size, file);
+ if (fclose(file) != 0) {
+ return false;
+ }
+ return true;
+}
+
+int main(int argc, char* argv[]) {
+ if (argc != 4) {
+ fprintf(stderr,
+ "Usage: %s <jxl> <pfm> <icc>\n"
+ "Where:\n"
+ " jxl = input JPEG XL image filename\n"
+ " pfm = output Portable FloatMap image filename\n"
+ " icc = output ICC color profile filename\n"
+ "Output files will be overwritten.\n",
+ argv[0]);
+ return 1;
+ }
+
+ const char* jxl_filename = argv[1];
+ const char* pfm_filename = argv[2];
+ const char* icc_filename = argv[3];
+
+ std::vector<uint8_t> jxl;
+ if (!LoadFile(jxl_filename, &jxl)) {
+ fprintf(stderr, "couldn't load %s\n", jxl_filename);
+ return 1;
+ }
+
+ std::vector<float> pixels;
+ std::vector<uint8_t> icc_profile;
+ size_t xsize = 0, ysize = 0;
+ if (!DecodeJpegXlOneShot(jxl.data(), jxl.size(), &pixels, &xsize, &ysize,
+ &icc_profile)) {
+ fprintf(stderr, "Error while decoding the jxl file\n");
+ return 1;
+ }
+ if (!WritePFM(pfm_filename, pixels.data(), xsize, ysize)) {
+ fprintf(stderr, "Error while writing the PFM image file\n");
+ return 1;
+ }
+ if (!WriteFile(icc_filename, icc_profile.data(), icc_profile.size())) {
+ fprintf(stderr, "Error while writing the ICC profile file\n");
+ return 1;
+ }
+ printf("Successfully wrote %s and %s\n", pfm_filename, icc_filename);
+ return 0;
+}
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