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Diffstat (limited to '')
-rw-r--r-- | third_party/jpeg-xl/experimental/fast_lossless/fast_lossless_main.cc | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/third_party/jpeg-xl/experimental/fast_lossless/fast_lossless_main.cc b/third_party/jpeg-xl/experimental/fast_lossless/fast_lossless_main.cc new file mode 100644 index 0000000000..b59051d4e2 --- /dev/null +++ b/third_party/jpeg-xl/experimental/fast_lossless/fast_lossless_main.cc @@ -0,0 +1,113 @@ +// 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 <string.h> + +#include <atomic> +#include <chrono> +#include <thread> +#include <vector> + +#include "lib/jxl/enc_fast_lossless.h" +#include "lodepng.h" +#include "pam-input.h" + +int main(int argc, char** argv) { + if (argc < 3) { + fprintf(stderr, + "Usage: %s in.png out.jxl [effort] [num_reps] [num_threads]\n", + argv[0]); + return 1; + } + + const char* in = argv[1]; + const char* out = argv[2]; + int effort = argc >= 4 ? atoi(argv[3]) : 2; + size_t num_reps = argc >= 5 ? atoi(argv[4]) : 1; + size_t num_threads = argc >= 6 ? atoi(argv[5]) : 0; + + if (effort < 0 || effort > 127) { + fprintf( + stderr, + "Effort should be between 0 and 127 (default is 2, more is slower)\n"); + return 1; + } + + unsigned char* png; + unsigned w, h; + size_t nb_chans = 4, bitdepth = 8; + + unsigned error = lodepng_decode32_file(&png, &w, &h, in); + + size_t width = w, height = h; + if (error && !DecodePAM(in, &png, &width, &height, &nb_chans, &bitdepth)) { + fprintf(stderr, "lodepng error %u: %s\n", error, lodepng_error_text(error)); + return 1; + } + + auto parallel_runner = [](void* num_threads_ptr, void* opaque, + void fun(void*, size_t), size_t count) { + size_t num_threads = *(size_t*)num_threads_ptr; + if (num_threads == 0) { + num_threads = std::thread::hardware_concurrency(); + } + if (num_threads > count) { + num_threads = count; + } + if (num_threads == 1) { + for (size_t i = 0; i < count; i++) { + fun(opaque, i); + } + } else { + std::atomic<int> task{0}; + std::vector<std::thread> threads; + for (size_t i = 0; i < num_threads; i++) { + threads.push_back(std::thread([count, opaque, fun, &task]() { + while (true) { + int t = task++; + if (t >= count) break; + fun(opaque, t); + } + })); + } + for (auto& t : threads) t.join(); + } + }; + + size_t encoded_size = 0; + unsigned char* encoded = nullptr; + size_t stride = width * nb_chans * (bitdepth > 8 ? 2 : 1); + + auto start = std::chrono::high_resolution_clock::now(); + for (size_t _ = 0; _ < num_reps; _++) { + free(encoded); + encoded_size = JxlFastLosslessEncode( + png, width, stride, height, nb_chans, bitdepth, + /*big_endian=*/true, effort, &encoded, &num_threads, +parallel_runner); + } + auto stop = std::chrono::high_resolution_clock::now(); + if (num_reps > 1) { + float us = + std::chrono::duration_cast<std::chrono::microseconds>(stop - start) + .count(); + size_t pixels = size_t{width} * size_t{height} * num_reps; + float mps = pixels / us; + fprintf(stderr, "%10.3f MP/s\n", mps); + fprintf(stderr, "%10.3f bits/pixel\n", + encoded_size * 8.0 / float(width) / float(height)); + } + + FILE* o = fopen(out, "wb"); + if (!o) { + fprintf(stderr, "error opening %s: %s\n", out, strerror(errno)); + return 1; + } + if (fwrite(encoded, 1, encoded_size, o) != encoded_size) { + fprintf(stderr, "error writing to %s: %s\n", out, strerror(errno)); + } + fclose(o); +} |