melissalinkert/jpegxl-sandbox

Install Bazel 1.2.1

See https://docs.bazel.build/versions/master/install.html Do not install 2.x.x, it is not compatible with the brunsli build files. On Ubuntu:

$ curl https://bazel.build/bazel-release.pub.gpg | sudo apt-key add -
$ echo "deb [arch=amd64] https://storage.googleapis.com/bazel-apt stable jdk1.8" | sudo tee /etc/apt/sources.list.d/bazel.list
$ sudo apt-get update
$ sudo apt-get install bazel-1.2.1

Clone and build google/brunsli

$ git clone git://github.com/google/brunsli
$ cd brunsli
$ git submodule update --init --recursive
$ mkdir bin
$ cd bin
$ cmake ..
$ make -j
$ sudo make -j install

Build the Java wrapper

$ cd ../java
$ bazel-1.2.1 build :all
$ cd dev/brunsli/wrapper
$ bazel-1.2.1 build :all
$ cd ../../../bazel-bin/dev/brunsli/wrapper
$ jar tf libcodec.jar
META-INF/
META-INF/MANIFEST.MF
META-INF/LICENSE
dev/
dev/brunsli/
dev/brunsli/wrapper/
dev/brunsli/wrapper/Codec.class
dev/brunsli/wrapper/CodecJNI.class
$ export CLASSPATH=$CLASSPATH:`pwd`/libcodec.jar
$ cp ../../../brunsli_jni.dll $JPEGXL-SANDBOX/libbrunsli_jni.so

Build the test class

$ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:`pwd`
$ javac JPEGXLTest.java

Convert JPEG to JPEG-XL

$ java -mx1g JPEGXLTest encode input.jpg output-xl.jxl

Convert JPEG-XL to JPEG

$ java -mx1g JPEGXLTest decode output-xl.jxl roundtrip.jpg

Results on sample images

See bf-data-repo/automated-tests/curated/jpeg/big-images/

File	Input size	Output size	Encode time	Decode time
2kx2k	497926	140048	0.905s	0.907s
4kx4k	1816405	534007	2.794s	1.696s
8kx8k	6302116	1768975	6.712s	7.143s

Compressed output file size is 28-30% of input JPEG file size. MD5 of original JPEG is equal to MD5 of roundtripped JPEG in all test cases.

melissalinkert / jpegxl-sandbox