The aim of this small project is to help to use of roboto fonts in documents rendered by FOP. It consists from:
- roboto ttf included
- created metrics files for TTF
- configuration file for using embeded fonts
Roboto is a typeface introduced with Android 4.0 Ice Cream Sandwich see article on wikipedia.
FOP (Formatting Objects Processor) is a in java written print formatter driven by XSL formatting objects (XSL-FO) and an output independent formatter. It reads a formatting object (FO) tree and renders the resulting pages to a specified output.
I'm using it for renedring of PDF documents from various sources (DocBook and custom).
Roboto is typeface optimized to look great on devices with high dencities but on paper it looks also great. And for me as an Android developer a natural selection for custom fonts ;-)
It is no rocket science to use embeded fonts with FOP. Its well documented and actually consins from two steps:
- create metrics files for True Type Fonts
- provide and configure fonts for use with FOP
fop/fop -c fop/conf/fop.xconf simple.fo simple.pdf
This Docker image wraps version 2.8 of apache-fop inckusive embedded Roboto fonts with proper roboto configuration and inclusive Java runtime environment so it can be executed as transparent command line tool even on machines without installed Java.
The image uses the official adoptopenjdk/openjdk11:alpine image for building a distribution of fop and https://hub.docker.com/r/adoptopenjdk/openjdk11/[adoptopenjdk/openjdk11:alpine-jre] for runtime.
You can build docker image from source code locally.
git clone https://github.com/michalharakal/fop-roboto.git
docker build -t roboto-fop .
For security reasons is Apache-Fop Docker image designed to run in the current folder only, so a container doesn't have any access to any other folders on a host system. Since this is a transparent call of Docker image from command line, where new files are generated, it is also a good idea to execute code inside a Docker as a non root user and match it to the host caller.
Calling a dockerized image can look like this:
docker run --rm -u $(id -u ${USER}):$(id -g ${USER}) -v `pwd`:/work roboto-fop simple.fo simple.pdf alias antlr4='docker run --rm -u $(id -u ${USER}):$(id -g ${USER}) -v `pwd`:/work roboto-fop $@'
Apache Fop is deistrubuted under Apache Licence version 2.0 https://xmlgraphics.apache.org/fop/license.html
Roboto Font was created by Google(TM), https://fonts.google.com/specimen/Roboto#license and is Licensed under Apache 2.0 license.