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| -rw-r--r-- | third_party/jpeg-xl/lib/jpegli/README.md | 28 |
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diff --git a/third_party/jpeg-xl/lib/jpegli/README.md b/third_party/jpeg-xl/lib/jpegli/README.md new file mode 100644 index 0000000000..1eef402eef --- /dev/null +++ b/third_party/jpeg-xl/lib/jpegli/README.md @@ -0,0 +1,28 @@ +# Improved JPEG decoder implementation + +This subdirectory contains a JPEG decoder implementation that is API and ABI +compatible with libjpeg62. + +*NOTE*: This is still a work in progress, currently only API functions called +from libjxl's benchmark_xl tool are implemented. + +To decompress an ```input.jpg``` file with this new library: + +``` +(from the libjxl root directory) +$ ./ci.sh opt +$ LD_PRELOAD=./build/libjpeg.so.62 ./build/tools/benchmark_xl --input input.jpg --codec=jpeg --decode_only --save_decompressed --output_dir . +``` + +The decompressed file will be saved as ```input.jpg.jpeg.png```. + +To benchmark the jpeg encoding-decoding round-trip on an ```input.png``` with +the new library, first build a statically linked ```cjpeg-static``` binary, +which is found in ```$PATH```, and then run: + +``` +(from the libjxl root directory) +$ ./ci.sh opt +$ LD_PRELOAD=./build/libjpeg.so.62 ./build/tools/benchmark_xl --input input.png --codec=jpeg:cjpeg-static:q90 +``` + |